JP2000018716A - Hot-water supply system, its control method, and combination valve used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a temperature jump phenomenon with a simple configuration by providing a combination valve communicating with a heating path, a bypass, and a hot water outlet path, closing down the bypass by adjusting a flow rate, adjusting the opening of the heating path, and adjusting the opening ratio of the bypass to the heating path by adjusting a mixing ratio. SOLUTION: A compound valve 16 of a valve body for adjusting the opening of a heating path 2 and that of a bypass 2a by operating a valve shaft while communicating with the heating path 2, the bypass 2a, and a hot water outlet path 3 is provided. In this case, the bypass 2a is closed down within the range of the travel amount of a valve shaft for adjusting a flow rate and the opening of the heating path 2 is adjusted, thus adjusting the flow rate of heating hot water. The opening ratio of the bypass 2a to the heating path 2 is adjusted in the range of the travel amount of the valve shaft for adjusting a mixing ratio, and the mixing ratio of bypass water to heating hot water can be adjusted. Also, within the range of the travel amount of the valve shaft for introducing water, the heating path 2 is closed down and only the bypass 2a is opened, thus preventing hot water from being unloaded due to a temperature jumping phenomenon.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water supply system.

2. Description of the Related Art In recent years, hot water supply systems have been widely used in baths, kitchens, and the like, in which hot water at a set temperature is immediately discharged simply by setting a temperature and opening a faucet.
Such a hot water supply system is widely used in ordinary households, and there is a demand for a hot water supply system with low cost, durability, and excellent maintainability. Hereinafter, a conventional hot water supply system will be described. (1) FIG. 10 is a hot water supply circuit diagram of a conventional hot water supply system. In FIG. 10, reference numeral 1 denotes a water supply path for supplying water to a hot water supply circuit, 2 denotes a heating path that includes a heat exchanger 5 that communicates with the water supply path and is heated by a heating device 4, and heats the supplied water. This is a hot-water outlet for hot water that flows through the hot water.
In the heating device 4, the amount of heating given to the heat exchanger is adjusted by the capacity adjusting device 6. Reference numeral 7 denotes a flow sensor disposed near the water supply end of the heating path 2 and detects a flow rate of water supplied to the heating path. Reference numeral 8 denotes an overflow prevention valve disposed near the water supply end of the heating path 2 for preventing an overflow of the water supply circuit. (Water governor), 9 is a tap water temperature sensor that is disposed in tap channel 3 and detects the temperature of hot water to be supplied, 10 is a tap water temperature sensor that is disposed at the feed end of heating path 2 and detects tap water temperature, and 11 is a tap water temperature sensor. A temperature setting device 12 for setting a target temperature of hot water to be requested is provided with a water supply flow rate detected by the flow rate sensor 7, a water supply temperature detected by the water supply temperature sensor 10, a tap water temperature detected by the discharge temperature sensor 9, and a temperature setter. This is a control device that controls the capacity adjusting device 6 based on the target temperature Ts set to 11 and controls the tapping temperature.
In the conventional hot water supply system configured as described above,
The operation will be described below. First, when the hot water is started after the target temperature is set by the temperature setting device 11, the control device 1
Reference numeral 2 designates the heating amount adjusted by the capacity adjusting device 6 based on the feed water temperature detected by the feed water temperature sensor 10 and the target temperature, and the heating device 4 is activated to start heating. Next, when the state shifts to the steady state, the control device 12 adjusts the heating amount by the capacity adjusting device 6 based on the feed water temperature detected by the feed water temperature sensor 10, the target temperature, and the tap water temperature detected by the tap water temperature sensor 9. (2) FIG. 11 is a hot-water supply circuit diagram of a conventional hot-water supply system disclosed in Japanese Patent Publication No. Hei 7-18562 (hereinafter referred to as “No. A”). In FIG. 11, a water supply channel 1, a heating channel 2, a hot water channel 3, a heating device 4, a heat exchanger 5, a capacity adjusting device 6, a flow sensor 7, an overflow prevention valve 8, a hot water temperature sensor 9, a water temperature sensor 10, Regarding the temperature setting device 11,
This is the same as (1), and the same reference numerals are given and the description is omitted. The hot water supply circuit in this conventional example communicates with the water supply passage 1 and the hot water passage 3 and is arranged in parallel with the heat exchanger 5 by a bypass passage 2a, and water flowing through the bypass passage (hereinafter referred to as "bypass water"). A) a water flow control valve 13 for adjusting the flow rate, a feed water temperature detected by the feed water temperature sensor 10 according to the temperature set by the temperature setting device 11, a feed water amount detected by the flow sensor 7, and a discharge water temperature detected by the tap water temperature sensor 9. Capacity adjusting device 6 and water amount adjusting valve 13 based on
And a control device 12 for controlling the above. In the conventional hot water supply system configured as described above, the control device 12 activates the capacity adjusting device 6 based on signals from the feed water temperature sensor 10, the flow rate sensor 7, and the hot water temperature sensor 9. The tapping temperature is controlled by controlling the amount of urging of the urging means of the water amount regulating valve 13 in proportion to the temperature deviation from the water heater 11 and in inverse proportion to the amount of supplied water. (3) FIG. 12 is a hot water supply circuit diagram of a conventional hot water supply system. In FIG. 12, a water supply channel 1, a heating channel 2, a bypass channel 2a, a tapping channel 3, a heating device 4, a heat exchanger 5, a capacity adjusting device 6, a flow rate sensor 7, a tapping temperature sensor 9, a feed water temperature sensor 10, and a temperature setting The device 11 is the same as that of (2), and the description is omitted by attaching the same reference numerals. The hot water supply circuit in this conventional example is provided at a junction between the bypass passage 2a, the heating passage 2 and the tap water passage 3, and is provided with a mixing valve 14 for adjusting a mixing ratio of hot water and bypass water, and a mixing valve 14 provided in the tap water passage. The water amount adjusting valve 13 for adjusting the amount of hot water, the supply water flow rate detected by the flow rate sensor 7, the supply water temperature detected by the supply water temperature sensor 10, the discharge water temperature detected by the discharge water temperature sensor 9, and the temperature setting unit 11 are set. It is characterized by including a control unit 12 that controls the tapping temperature by controlling the capacity adjusting device 6, the water amount adjusting valve 13, and the mixing valve 14 based on the target temperature Ts. The operation of the conventional hot water supply system configured as described above will be described below. First, when hot water is started, the control device 12 determines the heating amount and the bypass water corresponding to the set temperature of the temperature setting device 11 from the feed water flow rate detected by the flow rate sensor 7 and the feed water temperature detected by the feed water temperature sensor 10. Is determined, and the operation of the capacity adjusting device 6 and the mixing valve 14 is controlled to adjust the heating amount and the mixing ratio of the bypass water. Next, when the heating device 4 shifts to the steady heating state, the control device 12 adjusts the mixing valve 14, shuts off the bypass passage 2a and supplies hot water only from the heating passage 2, and at the same time, adjusts the capacity adjustment device 6 and the water amount adjustment. The temperature is controlled by adjusting the valve 13. (4) Japanese Patent Application Laid-Open No.
Japanese Patent Application Publication No. 158965 (hereinafter referred to as “B” publication) discloses a mixing type hot water supply system in which hot water from a heat exchanger and branch water (bypass water) from a water supply path are mixed at a set hot water supply temperature to supply hot water. In the mixing type hot water supply system, a branch tap for connecting a dishwasher having a valve mechanism for stopping branch water from a water supply channel and flowing only hot water from a heat exchanger to the dishwasher is provided at a hot water supply joint portion of the mixing type hot water supply system. A mixing type hot water supply system characterized by the above "is disclosed. (5) Japanese Patent Application Laid-Open No. 7-243700 (hereinafter, referred to as “C”)
Call. In the hot water supply system temperature control method of controlling the hot water temperature from the hot water supply system, the water proportional valve is squeezed until the hot water temperature reaches the set temperature during the period from the start of the combustion operation to the steady combustion. A hot water supply system temperature control method characterized by limiting the amount of hot water is disclosed.

However, the above-described conventional hot water supply system has the following problems. a. When a hot water supply system is used in a bath or the like, a case in which only water is discharged from a hot water supply path may be considered. In such a case,
In the conventional hot water supply system described in (1), since low-temperature water passes through the heat exchanger while the heater is stopped, dew condensation occurs inside the heat exchanger, soot clogging and low-temperature corrosion occur. Had. b. In the case where the hot water supply system is temporarily stopped after the hot water supply system is used, and the hot water supply is started again after a relatively short time (about several minutes), while the hot water supply is stopped, the heat exchanger is heated by its own residual heat. A phenomenon called so-called "post-boiling" occurs in which the hot water retained in the exchanger is heated to raise the temperature of the hot water. At this time, the temperature of hot water in the heat exchanger is 70 ° C to 90 ° C.
About. When tapping is resumed in this state, the temperature of the tapping water flowing out of the heating path is pulsed only for a short time (the time until almost all of the hot water staying in the heat exchanger is replaced) after a lapse of a certain time from the start of tapping. A “temperature jump phenomenon” that rapidly rises occurs. In particular, in recent years, it has been required that the “temperature jump phenomenon” be suppressed to within + 2 ° C. However, in the conventional hot water supply systems described in (1), (2), and (4), accurate feedforward control of the tapping temperature cannot be performed, and thus the “temperature jump phenomenon” in the tapping water temperature.
However, it was not possible to prevent the problem. c. Since the heating capacity of the heating device is finite, there is an upper limit of the flow rate at which hot water can be discharged per unit time with respect to the set target temperature. As the target temperature increases, the upper limit value (hereinafter, referred to as “maximum tapping flow rate limit”) decreases. When the hot water is discharged beyond the maximum hot water flow rate limit, the required amount of heat exceeds the heat supply capacity of the heating device, so that a hot water having a temperature lower than the target temperature flows out, that is, a phenomenon called "overflow" occurs. The conventional hot water supply system described in (4) has a problem that the overflow cannot be prevented. d. The conventional hot water supply systems described in (1) and (2)
Although an overflow prevention valve is provided to prevent the above overflow,
In order to prevent overflow in all target temperature ranges that may be set, overflow is performed according to the maximum hot water flow rate limit of the highest settable temperature (hereinafter referred to as “maximum set temperature”). It is necessary to set the upper limit of the flow rate of the check valve. Therefore, even if the target temperature is set to a low temperature, it is not possible to make the hot water flow at a flow rate higher than the maximum hot water flow rate limit at the maximum set temperature, so that there is a problem that the capacity of the heating device cannot be sufficiently used. Was. In general, tap water is often used as water to be supplied, but the supply water temperature differs between summer and winter, and the maximum hot water flow rate limit in winter is lower than the maximum hot water flow rate limit in summer. Therefore, in a hot water supply system used over a year, it is necessary to set the upper limit of the flow rate of the overflow prevention valve in accordance with the maximum tap water flow rate limit with respect to the maximum set temperature in the winter water supply temperature. In the case where the temperature is set at a low temperature, there is a problem that the capability of the heating device cannot be sufficiently used for the same reason as described above. e. The conventional hot water supply system described in (3) includes a mixing valve that performs adjustment for mixing bypass water and a water amount control valve that performs adjustment for preventing overflow in order to prevent a “temperature splash phenomenon”. However, since the hot water supply circuit requires two electric valves (mixing valve and water flow control valve) and requires a control mechanism for controlling each of them, there is a problem that the hot water supply circuit cannot be made compact. Was. f. The conventional hot water supply system described in (3) requires two electric valves (mixing valve and water flow control valve) in the hot water supply circuit and requires a control mechanism (a valve motor or the like) for controlling them, respectively. However, it is complicated, easily broken, and has a problem in reliability. g. The conventional hot water supply system described in (3) has a problem that the hot water supply circuit is complicated, the maintenance work is complicated, and the maintainability is poor. Further, the above-described conventional hot water supply system control method has the following problems. h. The control method of the conventional hot water supply system described in (5) has a problem that the “temperature jump phenomenon” in the temperature of the hot water to be discharged cannot be prevented. The hot water supply system of the present invention solves the above-mentioned conventional problems, and is capable of preventing dew condensation inside the heat exchanger, preventing a “temperature splash phenomenon”, and preventing over-flow. The capacity of the heating device can be used over the entire range below the maximum tapping flow rate limit, and the hot water supply circuit is simple, excellent in reliability and maintainability, compact, and low It is an object of the present invention to provide a hot water supply system that can be produced at a low cost. In addition, the control method of the hot water supply system of the present invention solves the above-mentioned conventional problems,
An object of the present invention is to provide a control method of a hot water supply system which can prevent a “temperature jump phenomenon” and can be realized with a simple configuration. Further, the composite valve used in the hot water supply system of the present invention can prevent dew condensation inside the heat exchanger, can prevent "temperature splash phenomenon", and prevent overflow. It is possible to use the capacity of the heating device over the entire range below the maximum hot water flow rate limit, and the hot water supply circuit is simple, excellent in reliability and maintainability, and a compact hot water supply system is possible. It is intended to provide a composite valve to be used.

In order to solve the above-mentioned problems, a hot water supply system according to the present invention comprises a water supply passage for supplying water, a heat exchanger heated by a heating device, and a heat exchanger connected to the water supply passage. A heating path through which water flows, a bypass path diverted from a water supply path, a hot water path for supplying mixed hot water in which hot water from the heating path and water from the bypass path are mixed to a hot water outlet, a heating path and a bypass path And a compound valve having a valve body that communicates with the hot water path and controls the opening degree of the heating path and the opening degree of the bypass path by operating one of the valve shafts. The valve body has a shaft movement amount range and a valve shaft movement amount range for adjusting the mixing ratio, and the valve element closes the bypass passage in the valve shaft movement amount range for adjusting the flow rate, adjusts the opening degree of the heating path, and mixes The opening degree of the bypass passage and the opening of the heating passage in the range of the valve shaft movement amount that performs the ratio adjustment Consisting configuration and to perform the adjustment of the ratio of the. With this configuration, it is possible to prevent dew condensation inside the heat exchanger, it is possible to prevent a "temperature jump phenomenon", and it is possible to prevent over-flow.
The capacity of the heating device can be used over the entire range below the maximum tapping flow rate limit, and the hot water supply circuit is simple, has excellent reliability and maintainability, can be made compact, and can be produced at low cost. A hot water supply system that can be provided can be provided. In order to solve the above-described problems, a control method of a hot water supply system according to the present invention includes a flow rate sensor that detects a flow rate of water in a water supply path, a water supply temperature sensor that detects a water temperature of a water supply path, and a water temperature in a heat exchanger. Heat exchange sensor, a temperature setting device for setting a target value of the temperature of the mixed hot water discharged from the hot water path, a valve motor for driving the valve shaft of the composite valve, and a capacity adjusting device for adjusting the heating amount of the heating device And a control device for controlling the valve motor and the capacity adjusting device based on the detected values of the flow rate sensor, the feedwater temperature sensor, and the heat exchange sensor and the target value of the temperature set by the temperature setting device. 1 to 6
The control method of the hot water supply system according to any one of the above,
In the steady tapping state, the control device controls the tapping temperature by adjusting the flow rate by adjusting the valve shaft moving amount of the combined valve and the heating amount by the capacity adjusting device, and when the tapping is stopped, the control device is controlled by the heat exchange sensor. Based on the detected hot water temperature immediately after the heat exchanger and the water temperature of the water supply channel detected by the feed water temperature sensor, adjust the valve shaft movement of the combined valve according to the target value of the temperature set by the temperature setting device. Predictive control of the tapping temperature when tapping is resumed is performed by previously adjusting the mixing ratio of hot water and bypass water. Thus, it is possible to provide a control method of the hot water supply system that can prevent the “temperature jump phenomenon” and the excessive outflow by controlling only the valve shaft movement amount of the composite valve. A composite valve used in the hot water supply system of the present invention to solve the above problems is a composite valve used for mixing hot and cold water in the hot water supply system, and is provided with a valve housing and a water supply formed inside the valve housing. A valve chamber communicating with a water inlet and a hot water inlet to which hot water is supplied, and a hot water outlet through which a mixed hot water is discharged; a valve shaft inserted into a valve housing and rotatable; and a valve. A valve body formed with a mixing chamber that is rotatably fitted to the chamber and that is rotated by a valve shaft and opened to the inside of the tap hole, and a water inlet that penetrates from the outer wall of the valve body to the mixing chamber; A hot water inlet penetrating from the outer wall of the valve body to the mixing chamber at a position shifted in the rotation axis direction of the valve body and the rotation direction of the valve body with respect to the position of the water inlet port,
a. When the valve shaft is at the water guide angle position, the hot water inlet is closed by the valve chamber wall, the water inlet overlaps with the water inlet, and b.
When the valve shaft is at the mixing ratio adjusting angle position, the hot water inlet partially overlaps with the hot water inlet, and the water inlet partially overlaps with the hot water outlet; c. When the valve shaft is in the flow control angle position, the hot water inlet partially overlaps with the spout, the water inlet is closed by the valve chamber wall, or the hot water inlet partially overlaps with the hot spout. The water inlet partially overlaps with the water inlet, and the ratio of the area where the water inlet and the hot water inlet and the area where the water inlet and the water inlet overlap is substantially constant; d. When the valve shaft is at the closing angle position, the hot water inlet is closed by the valve chamber wall, and the water inlet is closed by the valve chamber wall. This makes it possible to close the hot water outlet when water is desired to flow into the hot water outlet, and to use the hot water outlet connected to the bypass path, the hot water outlet connected to the heating path, and the hot water outlet connected to the hot water outlet. Accordingly, it is possible to provide a composite valve capable of performing flow rate control for preventing excessive outflow of the hot water supply system and mixing ratio control for preventing "temperature splash phenomenon" by rotating one valve shaft. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS A hot water supply system according to claim 1 of the present invention.
The stem is heated by a water supply channel that supplies water and a heating device.
Communicates with the heat exchanger to be heated and the water supply channel to pass water through the heat exchanger
Heating path, a bypass path diverted from the water supply path,
Mixed hot water mixed with hot water from the road and water from the bypass
Hot water supply path for supplying water to the hot water outlet, heating path, bypass path, and hot water supply
The opening degree of the heating path is controlled by operating one valve shaft.
A composite valve with a valve body for adjusting the opening degree of the bypass passage
And the compound valve has a valve shaft movement amount range for performing flow rate adjustment.
And a valve shaft movement amount range for adjusting the mixing ratio, and the valve element has:
Do not bypass the valve in the range of the valve shaft movement for adjusting the flow rate.
Close and adjust the opening of the heating path and adjust the mixing ratio
In the range of valve shaft movement, the opening degree of the bypass passage and the heating passage
It is characterized by adjusting the ratio of the aperture to the aperture.
With this configuration, the valve shaft movement range (hereinafter referred to as “flow control range”
It is called "enclosure." ) From the heating path by operating the valve shaft
To adjust the flow rate of hot water (hereinafter referred to as “hot water”)
Becomes possible. Valve shaft travel range for adjusting the mixing ratio
(Hereinafter referred to as “mixing ratio adjustment range”) to operate the valve shaft
The water from the bypass (bypass water)
Call. ) And hot water can be adjusted.
You. Flow rate adjustment by manipulating the amount of movement of one valve shaft
And the adjustment of the mixing ratio. That
Has an action. Here, the valve shaft movement amount is the rotation angle of the valve shaft
Or the amount of displacement.
In a compound valve that operates the valve, the rotation angle of the valve shaft is
And linearly displaced in the axial direction of the valve shaft.
In a compound valve that operates the valve body by the
The amount of movement. A hot water supply system according to claim 2 of the present invention.
Is the hot water supply system according to claim 1, wherein the valve body is
Valve shaft movement to adjust the flow rate to the part that opens and closes the bypass
Notch opening for heating path opening degree in the volume range
Water from the bypass such that the ratio of degrees is approximately constant.
It has a notch for leakage.
In addition to the operation of the first aspect, in the flow rate adjustment range, a fixed ratio to the hot water is provided.
The bypass water is mixed. During flow control, the supply water flows to the heating path and the bypass path.
Since the water is split, the flow rate of the hot water is reduced,
The flow velocity in the pipe (or in the valve) of the composite valve is suppressed. The target value of the temperature of the mixed hot water discharged from the
Always keep the heat exchanger at a high temperature, even if
It becomes possible. It has the action of: The hot water supply system according to claim 3 of the present invention is characterized in that
The hot water supply system as described above, wherein the notch portion adjusts the flow rate.
Leakage from the bypass in the range of valve shaft movement
5% or more of the flow rate of hot water from the heating path
0% or less, preferably 10% or more and 50% or less
It is assumed that it is formed in this configuration.
In addition to the function of claim 2, the heat exchanger and the composite valve
Erosion and corrosion are suppressed and heat
It has the effect of preventing boiling in the exchanger. Book
The hot water supply system according to claim 4 of the present invention is described in claim 1.
Hot water supply system, which is connected to a bypass or water supply
It is supplied from the heating path by communicating with the downstream side of the heat exchanger of the heat path.
The hot water is bypassed at a flow rate substantially constant to the flow rate of the hot water.
Always have a bypass to mix water from roads or waterways.
According to this configuration, claim 1 is provided.
In addition to the functions described in the above, the water pressure in the water supply channel is
Is higher than the hot water,
Water is supplied and mixed, the set temperature is low
The heat exchanger can always be kept hot
It works. During flow control, the supply water flows to the heating path and the bypass path.
Since the water is split, the flow rate of the hot water is reduced,
The flow velocity in the pipe (or in the valve) of the composite valve is suppressed. Of the present invention
A hot water supply system according to a fifth aspect is the hot water supply system according to the fourth aspect.
In the hot water system, the always bypass path is always bypass
The flow rate of water in the road is more than 5% of the flow rate of hot water from the heating path
60% or less, preferably 10% or more and 50% or less.
According to this configuration, according to claim 4
Erosion in heat exchangers and combined valves
And corrosion are suppressed, and boiling in the heat exchanger
It has the effect of being prevented. According to claim 6 of the present invention.
The hot water supply system according to any one of claims 1 to 5.
3. The hot water supply system according to item 1, wherein the composite valve conducts water conduction.
The valve shaft has a valve shaft movement range, and the valve body is a valve shaft movement amount for conducting water.
Close the heating path and open only the bypass path in the range
According to this configuration, claims 1 to
The heater is stopped in addition to the operation according to claim 5.
To supply water directly to the hot water channel, block the heating channel.
And water can be introduced through the bypass.
It has the effect of preventing condensation in the heat exchanger. Departure
A method for controlling a hot water supply system according to claim 7 is characterized in that:
Flow rate sensor that detects the flow rate of water in the
Feed water temperature sensor to detect and water temperature just after heat exchanger
Heat exchange sensor and the temperature of the mixed hot water discharged from the hot water path
Drives the temperature setting device to set the target value of the valve and the valve shaft of the composite valve
Valve motor and the ability to adjust the heating amount of the heating device
Equipment, the flow rate sensor, the feed water temperature sensor, and the heat exchange sensor.
Detected value and target temperature set by temperature setting device
A control device for controlling the valve motor and the capacity adjusting device based on the
7. The apparatus according to claim 1, further comprising:
The method of controlling a hot water supply system according to
In addition, the controller controls the flow rate by adjusting the valve shaft movement of the composite valve.
Hot water temperature by adjusting the amount of heating by the adjustment and capacity adjustment device
When the hot water is stopped, the control device
The temperature of hot water immediately after the heat exchanger detected by the heat exchange sensor
Based on the water temperature of the water supply channel detected by the water temperature sensor.
Corresponding to the target temperature set by the temperature setting device.
Adjust the valve shaft travel of the composite valve to mix heating water and bypass water.
When tapping is resumed by adjusting the mixing ratio in advance
Control for predicting the tapping temperature of hot water.
With the configuration of the above, by controlling only the valve shaft movement amount of the composite valve,
It is possible to prevent "temperature jump phenomenon" and overflow.
It has the effect of Hot water supply according to claim 8 of the present invention.
The compound valve used in the system is
A composite valve used in combination with a valve housing and a valve inside the valve housing.
A spout to which water is supplied and a spout to which hot water is supplied
It is connected to the outlet from which the mixed hot water mixed with hot water is discharged.
A valve chamber, a rotatable valve shaft inserted into the valve housing, and a valve.
Closely rotatably fitted to the chamber, rotated by the valve shaft and tapping inside
A valve body with a mixing chamber open towards the mouth,
Water inlet that penetrates from the wall to the mixing chamber and the position of the water inlet
With respect to the axis of rotation of the valve and the direction of rotation of the valve.
A hot water inlet penetrated from the outer wall of the valve body to the mixing chamber
And a. When the valve shaft is in the water conveyance angle position,
The port is closed by the valve chamber wall, and the water inlet is overlapped with the water inlet.
B. When the valve shaft is in the mixing ratio adjustment angle position,
The inlet partially overlaps with the spout, and the water inlet is
Polymerize fractionally, c. When the valve shaft is in the flow control angle position
Is that the hot water inlet partially overlaps with the hot water inlet, and the hot water inlet is a valve
It is closed by the indoor wall, or the hot water inlet is part of the hot water outlet.
The water inlet partially polymerizes with the water inlet,
Of the area where the spout and hot water inlet and the headrace and water inlet overlap
The ratio is substantially constant, d. When the valve shaft is in the closed angle position
The water inlet is closed by the valve chamber wall, and the water inlet is
It is assumed that it is closed by the indoor wall.
With this configuration, the hot water valve is closed when the valve shaft is in the water conveyance angle position.
The mixing chamber is shut off and the water valve is opened.
The water flows through the outlet. When the valve shaft is in the mixing ratio adjustment angle position,
The ratio of the opening degree (opening area) between the valve and the water valve is the rotation angle of the valve shaft.
The outlet changes through the mixing chamber through the mixing chamber.
The amount of water flowing into the tank and flowing from the water inlet to the tap through the mixing chamber
The ratio to the amount of water to be adjusted is adjusted. When the valve shaft is in the flow control angle position,
The degree of opening (opening area) changes with the rotation angle of the valve shaft.
The amount of water flowing from the tap to the tap through the mixing chamber
The water valve is closed, or the opening degree and the hot water valve
Because the valve is opened so that the ratio with the opening degree is constant,
Water from the water inlet is stopped, or the mixing chamber is
At a substantially constant rate to the amount of hot water flowing through the tap
Water flows from the headrace through the mixing chamber to the tap. When the valve shaft is in the closed angle position, the water valve and
Since the hot water valve is closed, the hot water from the hot water outlet also
Water is shut off and stopped. As shown in the above ~, water from the water inlet to the tap
Only the water supply and the flow rate control of the hot water flowing from the hot water outlet to the hot water outlet
And the hot water flowing from the tap to the tap and the tap from the tap to the tap
Rotating one valve shaft to adjust the mixing ratio with flowing water
It is possible to do so. It has the action of: Book
Composite used in the hot water supply system according to claim 9 of the present invention
The valve is a compound valve used for mixing hot and cold water in a hot water supply system.
Hot water supply port and water supply port
And a tap for discharging a mixed hot water in which hot water and water are mixed,
A valve housing having a water outlet and a water inlet formed inside the valve housing.
Mixing room with the mixing chamber that communicates with
Mixed with the hot water valve chamber, which is inserted into the valve housing and communicates with the hot water chamber.
A valve shaft that is inserted into the joint chamber and that can reciprocate in the axial direction;
A water valve that can be freely inserted and reciprocated in the mixing chamber in the axial direction of the valve shaft
Body, and between the mixing chamber and the water inlet, together with the water valve body
A water valve seat that constitutes a water valve, and a water valve element that is loosely inserted into the valve shaft
And spring fixed to the valve shaft.
Stopper to prevent the water valve body from coming off the valve shaft
And reciprocate in the axial direction of the valve shaft inside the hot water valve chamber attached to the valve shaft
A movable hot water valve body, and a hot water valve body
A first hot water valve seat that constitutes a first hot water valve together with the hot water valve element;
The second hot water is disposed between the hot-water valve chamber and the mixing chamber together with the hot-water valve element.
A second hot-water valve seat that constitutes a valve for water. Valve stem is guided
When in the water position, the hot water valve element is tightly fitted to the first hot water valve seat.
The first hot water valve is closed and the water valve body is separated from the water valve seat.
The drain valve is opened; b. Valve shaft is in the mixing ratio adjustment position
In this case, the hot water valve element is connected between the first hot water valve seat and the second hot water valve seat.
The first hot water valve and the second hot water valve are located between
The valve element is detached from the water valve seat, the water valve is opened, and c. Stem
Is in the flow control position, the hot water valve element is the first hot water valve.
A first hot water valve and a second hot water valve located between the seat and the second hot water valve seat;
The water valve is opened, the water valve is tightly fitted to the water valve seat, and the water valve is
Closed, d. If the valve shaft is in the closed position,
The body fits tightly into the second hot water valve seat, the second hot water valve is closed,
The valve body shall be tightly fitted to the water valve seat and the water valve shall be closed.
With this configuration, when the valve shaft is at the water feed position, the first hot water valve is
It is closed and the water valve is open.
Water flows to the tap through the valve chamber and the mixing chamber. When in the mixing ratio adjustment position, the first hot water valve and
The ratio of the degree of opening to the water valve changes with the displacement of the valve shaft.
The amount of water flowing from the tap to the tap and the tap from the tap
The ratio to the amount of water flowing to the water is adjusted. When the valve shaft is in the flow control position, the water valve
Closed, the opening of the second hot water valve changes with the displacement of the valve shaft
The flow rate of hot water flowing from the tap to the tap
It is. When the valve stem is in the closed position, the water valve and the
2 Since the hot water valve is closed, the hot water from the hot water outlet is
These waters are also shut off and stopped. As shown in the above ~, water from the water inlet to the tap
Only the water supply and the flow rate control of the hot water flowing from the hot water outlet to the hot water outlet
And the hot water flowing from the tap to the tap and the tap from the tap to the tap
One valve shaft is displaced in the axial direction by adjusting the mixing ratio with flowing water.
You can do this by making it. Has the effect of
I do. Used in the hot water supply system according to claim 10 of the present invention.
The composite valve performed is the composite valve according to claim 9, wherein
The casing has a constant bypass pipe that connects the water inlet and the hot water outlet.
It has been established that, by this configuration,
In addition to the function described in claim 9, the water pressure of the water inlet is controlled by the water inlet.
By making the pressure higher than the water pressure by a constant pressure,
Is always supplied with bypass water at a constant rate. Book below
An embodiment of the present invention will be described with reference to the drawings.
I do. (Embodiment 1) FIG. 1 shows Embodiment 1 of the present invention.
It is a hot-water supply circuit diagram of a hot-water supply system. In FIG. 1, 1 is
Water supply channel for supplying water to the hot water supply circuit, 2 communicates with water supply channel 1
The water is provided with a heat exchanger 5 heated by the heating device 4.
2a is connected to the water supply channel 1 and the hot water channel 3
A bypass arranged in parallel with the communicating heat exchanger 5
Paths 3 and 3 are connected to heating path 2 and mixed with bypass water and hot water
This is a hot water path for discharging mixed hot water. Heating device 4 is capable
The amount of heating given to the heat exchanger 5 is adjusted by the adjusting device 6.
ing. 7 is the water supply flow rate to the water supply channel 1
A flow sensor 9 for detecting the temperature of the hot water,
Hot water temperature sensor for detecting the temperature of the mixed hot water
Water supply temperature that is provided at the water supply end of waterway 1 and detects the water supply temperature
The sensor 15 is disposed at the outlet of the heat exchanger 5
This is a heat exchange sensor that detects the temperature of hot water immediately after. 16 is added
One valve communicates with the heat path 2, the bypass path 2a, and the hot water path 3.
Opening of heating passage and opening of bypass passage by operating shaft
Valve body for adjusting the flow rate, and the valve shaft movement range for adjusting the flow rate
Close the bypass in the enclosure and adjust the opening of the heating path
In the valve shaft travel range where the mixing ratio is adjusted.
Adjust the ratio between the opening degree of the pass path and the opening degree of the heating path.
Mixes the hot water passing through the heating path with the bypass water
Mixing ratio control function to adjust mixing ratio and shut off bypass water
Flow control function to adjust the flow rate of hot water passing through the heating path
This is a composite valve that combines 11 is the required target temperature of hot water
A temperature setting device for setting the temperature, 12 is detected by the flow sensor 7.
Detected by known feedwater flow rate and feedwater temperature sensor 10
Hot water supplied and hot water detected by hot water temperature sensor 9
Temperature and hot water in the heat exchanger detected by the heat exchange sensor 15
Based on the temperature and the target temperature Ts set in the temperature setter 11,
The tapping temperature control device 6 and the composite valve 16 are controlled to discharge the hot water.
Is a control unit that performs the control. Next, the hot water supply system
Drawing of the combined valve in Embodiment 1 used
It will be described using FIG. FIG. 2A shows a hot water supply system according to the first embodiment.
Fig. 2 (b) is a sectional view of a main part of a composite valve used in the system.
2 (a) with the hot water supply system according to the first embodiment cut on the side A
FIG. 3 is a sectional end view of a composite valve used. In FIG.
Reference numeral 29 denotes hot water from the heating path 2 on the side wall (hereinafter referred to as “heating water”).
Huh. ) And the bypass water is introduced.
Multiple holes formed at an angle of about 90 degrees with the water introduction port 27a.
The valve housing of the joint valve 16 and the valve motor 29a are mounted on the valve housing 29.
Mounting flange, 1 'for water supply connected to water supply channel 1
The pipe 2 'is a drain pipe connected to the water supply end of the heating path 2, and 23 is
A valve element rotatably fitted to the valve housing 29, 23a is the valve element 2
3 is a valve shaft formed on the upper part for rotating the valve element, 24 is
Heated hot water and viper are formed in the valve body 23 in a substantially cylindrical hollow shape.
One end of the mixing chamber for mixing water with water 2a 'comes out of the water supply pipe 1'.
It is in communication with the water pipe 2 'and mixes bypass water from the water supply pipe 1'.
Bypass constituting the bypass passage 2a for introducing water to the joint room 23
A pipe 26 is bored in the side wall of the valve body 23 to supply heated water to the mixing chamber 2.
A hot water inlet 27 for introducing into the valve 4 is formed in the side wall of the valve body 23.
To mix the bypass water supplied from the bypass pipe 2a '.
Water inlet for conducting water to the room 24, 3 'below the valve housing 29
Hot water pipe connected to the hot end of hot water channel 3 formed in the section, 2
8 is an outlet opening at the lower part of the mixing chamber 24 and communicating with the tapping pipe 3 '.
Gate 30 is a water supply pipe 1 ', a water discharge pipe 2', and a bypass pipe 2a '.
To be installed at the junction with the water supply temperature sensor
This is the water supply temperature sensor mounting port. The valve body 23 has a valve shaft 23a.
Driven by a valve motor (not shown) attached to the
You. The control device 12 controls the valve motor to
Controls the rotation angle of the valve shaft (hereinafter referred to as “valve shaft rotation angle”) θ
I do. FIG. 3 is used in the hot water supply system of the first embodiment.
FIG. 4A is a schematic view of the operation of the valve body of the composite valve, and FIG.
Valve shaft rotation angle of compound valve used in hot water supply system of mode 1
FIG. 4B is a graph showing the change characteristics of the mixing ratio with respect to FIG.
Shaft rotation of the compound valve used in the hot water supply system of the first aspect
It is a change characteristic figure of the tapping flow rate with respect to a corner. 3 and 4
In the above, A is a water-stop state in which heated water and bypass water are stopped.
State B stops the bypass water and adjusts the flow rate of the hot water
Flow rate adjustment range, C adjusts the mixing ratio of bypass water and hot water
Adjustable mixing ratio adjustment range, D shuts off hot water and bypasses
This indicates a water supply state in which only water is supplied. States A to D above
Water inlet 26a, hot water inlet 26, and water inlet 2 corresponding to
FIG. 3 schematically shows the positional relationship between the water inlet 7a and the water inlet 27.
Was. Sh (θ) is opened to the mixing chamber 24 with respect to the valve shaft rotation angle θ.
Area of the heating path 2 (the hot water inlet 26a and the hot water inlet 26)
And Sb (θ) are relative to the valve shaft rotation angle θ.
Opening area of bypass passage 2a opening into mixing chamber 24 (water introduction
(Area where the port 27a and the water inlet 27 overlap). Mixed
In the mixing ratio adjustment range C, the mixing ratio Rh of the hot water is
Assuming that water is incompressible in the circuit, in principle, it can be expressed as follows: Rh = Sh (θ) / (Sh (θ) + Sb (θ)) ) And Sb (θ)
It is roughly determined by the area ratio. The tap water flow rate Q at this time is Sh
It is substantially proportional to (θ) + Sb (θ). In flow control range B
The tap water flow rate Q is substantially proportional to Sh (θ). Therefore, for composite valves
The heating path 2 and the bypass at each valve shaft rotation angle θ
By adjusting the opening areas Sh (θ) and Sb (θ) of the road 2a,
Can be adjusted to flow characteristics as shown in Fig. 4.
It is. However, water is actually a compressible viscous fluid
Due to the water flow resistance of the pipeline, etc.
It must be determined experimentally. Hereinafter, in the present embodiment
The valve shaft rotation angle θ and the hot water and
Explanation of the relationship with the flow rate of pass water with reference to the drawings
I do. (1) In the water stop state A (θ0 ≦ θ ≦ θ1), the heating path 2 is opened.
Both the opening area Sh and the opening area Sb of the bypass passage 2a are 0.
Heating water and bypass water are both shut off.
You. (2a) In the flow rate adjustment range B (θ1 ≦ θ ≦ θ3), the valve shaft rotation
When the turning angle θ is in the range of θ1 ≦ θ ≦ θ2, the opening area Sb
Is 0, and the opening area Sh increases with an increase in the valve shaft rotation angle θ.
(See FIG. 3). As a result, the flow rate of the heating water
It increases with the rotation angle θ, and the amount of hot water depends on the valve shaft rotation angle.
Q can be controlled. (2b) When the valve shaft rotation angle θ is in the range of θ2 ≦ θ ≦ θ3
Means that the opening area Sb is 0 and the opening area Sh is the maximum state.
It is constant, and the tapping amount Q is also substantially constant. (3) In the mixing ratio adjustment range C (θ3 ≦ θ ≦ θ4), the opening surface
The product Sb increases as the valve shaft rotation angle θ increases,
The opening area Sh decreases as the valve shaft rotation angle θ increases.
As a result, the heating water and
The mixing ratio Rh with the pass water changes to control the valve shaft rotation angle θ.
It becomes possible to control the mixing ratio Rh more. (4) In the water conveyance state D (θ4 ≦ θ ≦ θ5), the opening area Sh
Is 0, and the opening area Sb is substantially constant. This allows
From the water supply channel 1 through the bypass with the heat path blocked
Water can be directly guided to the hot water path 3. As above
In the hot water supply system of the present embodiment configured as
The control method will be described below. (I) In a state where the tapping water is constantly flowing (steady tapping state)
In other words, the controller 12 sets the valve shaft rotation angle θ to the flow rate adjustment range B.
(Valve shaft rotation angle range of θ1 ≦ θ ≦ θ3 in FIG. 4)
You. At this time, the feed water flow rate detected by the flow rate sensor 7
(= Water supply flow rate Q) is detected by the feedwater temperature sensor 10.
Smaller than the maximum tapping flow rate limit for the supplied water temperature Tc
Control device 12 controls the valve body 23 by the valve motor.
The state where the opening area Sh is maximum (in FIG. 4, θ2 ≦ θ ≦ θ
(Area 3) and fixed to the heat exchanger by the capacity adjusting device 6.
Controlling the tapping temperature by adjusting the amount of heat supplied
Do. The feedwater flow rate detected by the flow sensor 7 is
For the feedwater temperature Tc detected by the temperature sensor 10
If the maximum hot water flow rate limit is exceeded, the capacity adjustment device 6
The amount of heat supplied to the heat exchanger 5 is fixed to the maximum, and the valve mode
The rotation angle θ of the valve shaft is adjusted to the flow rate adjustment range B (θ1 ≦ θ ≦ θ2
Of the hot water flow by adjusting the opening area Sh in the region
The tapping temperature is controlled by adjusting the amount Q. This
Such control will prevent over-spill
The tap water flow depends on the maximum tap water flow rate limit for the target temperature.
Changing the minimum value of the tap water flow rate to start adjusting the amount
To make full use of the capacity of the heating device.
It becomes possible. (Ii) Dispensing of hot water and supply of water detected by flow sensor 7
When the water flow rate becomes 0, the temperature of the hot water in the heating path is
The temperature rises for a while after the hot water is stopped, and the heat of the heat exchanger
The temperature of the hot water in the heating path 2
Descend. At this time, the control device 12
Water temperature Th detected by the water supply temperature sensor 1
0 from the feed water temperature Tc0 detected by
Predict the mixing ratio of heated water and bypass water to the target temperature Ts.
Measurement, and the valve shaft rotation angle θ is controlled by the valve motor.
The adjustment is performed in a box C (θ3 ≦ θ ≦ θ4). Such a system
Control, when the hot water is restarted, the temperature jump
To prevent hot water from being discharged by the
It becomes possible. (Iii) Restart hot water supply and stay in heating path 4 by supplying water
The hot water that has been replaced is almost replaced, and the heat supplied from the heat exchanger
The amount is almost stable, and the tapping temperature Tm by the tapping temperature sensor is low.
Then, the control device 12 controls the valve shaft rotation angle θ by the valve motor.
To the flow rate adjustment range B, and in the steady tapping state.
Transfer to control. (Iv) The water supply channel 1 with the heating device 4 stopped.
When water is passed through the hot water path 3 from the
To set the valve shaft rotation angle θ to the water conveyance state D (θ4 ≦ θ ≦ θ5).
You. By performing such control, the heat exchanger 5
Direct water supply from the water supply channel 1 to the hot water channel 3 without passing low-temperature water
And condensation occurs inside the heat exchanger 5.
To prevent soot clogging and low-temperature corrosion.
It becomes possible. As described above, according to the present embodiment, the water supply
Water channel 1 and heat exchanger 5 heated by heating device 4
And a heating path 2 communicating with the water supply path 1 and passing the water through the heat exchanger 5.
And a bypass 2a diverted from the water supply channel 1 and a heating channel.
Mixing of hot water from 2 and water from bypass 2a
Hot water path 3 for feeding hot water to the hot water outlet, heating path 2 and bypass
It communicates with the channel 2a and the tapping channel 3 and operates by operating one valve shaft.
Adjusting the opening degree of the heat path 2 and the opening degree of the bypass path 2a
A composite valve 16 having a valve body.
Valve shaft movement range for adjusting the amount and valve shaft movement for adjusting the mixing ratio
A valve body having a movement range and a valve shaft movement range for conducting water.
Is a bypass passage in the range of the valve shaft movement for adjusting the flow rate.
2a is closed, the opening degree of the heating path 2 is adjusted, and the mixing ratio is adjusted.
Opening of the bypass passage 2a in the range of the valve shaft movement amount for performing the joint
Control of the ratio between the temperature and the opening degree of the heating path 2 to conduct water
The heating path 2 is closed and the bypass path 2 is closed in the valve shaft movement range.
By opening the valve a only, the flow of the hot water can be controlled by operating the valve shaft in the flow rate adjustment range.
The amount can be adjusted. In the mixing ratio adjustment range
Mixing of bypass water and hot water by operating the valve shaft
The ratio can be adjusted. Flow rate adjustment by manipulating the amount of movement of one valve shaft
And the adjustment of the mixing ratio. A place where the heater is stopped to supply water directly to the tap water channel
In this case, shut off the heating channel and conduct water through the bypass channel.
Is possible, and the condensation of the heat exchanger is prevented.
Having. (Embodiment 2) FIG. 5 (a) shows Embodiment 2 of the present invention.
For valve shaft rotation angle of compound valve used in hot water supply system
FIG. 5B is a characteristic diagram of a change in the mixing ratio, and FIG.
Tapping for the valve shaft rotation angle of the compound valve used in the system
FIG. 6 is a flow rate change characteristic diagram, and FIG. 6 is a hot water supply system according to the second embodiment.
It is an operation | movement schematic diagram of the valve element of the compound valve used by (1). This implementation
In the embodiment, the combination other than the hot water supply circuit and the water inlet 27 is
Since the configuration of the valve is the same as that of the first embodiment, the description is omitted.
You. In this embodiment, the valve shaft rotation angle θ is
In the range, the bypass water is
The notch 2 is formed in the valve element 23 of the composite valve 16 so as to be mixed.
7b is formed. Below, this implementation
And the valve shaft rotation angle θ in each state of A to D in the form of
Refer to the drawing for the relationship between the flow rate of hot water and bypass water.
It will be explained while referring to the figures. (1) In the water stop state A (θ0 ≦ θ ≦ θ1), the heating path 2 is opened.
Both the opening area Sh and the opening area Sb of the bypass passage 2a are 0.
Heating water and bypass water are both shut off.
You. (2a) In the flow rate adjustment range B, the valve shaft rotation angle θ is θ1 ≦ θ.
In the range of ≤θ2, the opening area Sh is smaller than the valve shaft rotation angle θ.
As it increases with increasing, it projects to the water inlet 27
The notch 27b (see FIG. 6) provided provides an opening area.
The ratio Sh: Sb becomes substantially constant. As a result, the valve shaft rotation angle θ
As the amount of hot water Q increases with the increase in
The bypass water is mixed at a constant rate. Therefore, the valve stem
The amount of hot water can be controlled by controlling the rotation angle θ
And the hot water always has a constant amount of bypass water.
Mixing, so the heating device is always kept at a high temperature
Especially when the hot water system is humid
Prevents condensation in the heat exchanger when installed in place
You. Also, the supply water is heated by the bypass and heating
To reduce the flow rate of hot water passing through the heating path.
Since it can be reduced, water conduction in heat exchangers and composite valves
Of suppressing erosion and corrosion on roads
There is. At this time, the bypass water is 5% or more of the hot water.
60% or less, preferably 10% or more and 50% or less.
If the bypass water is 10% or less, prevention of dew condensation in the heat exchanger
Less stopping action, erosion and corrosion suppression
If the bypass water is 50% or more, the target temperature
If the temperature is set to a constant temperature, the temperature of the mixed hot water at the target temperature is obtained.
The temperature of the hot water required to exceed 100 ° C
It is possible that boiling may occur in the heat exchanger
It is. (2b) When the valve shaft rotation angle θ is in the range of θ2 ≦ θ ≦ θ3
Means that the opening area Sb is substantially constant with an increase in the valve shaft rotation angle θ.
Or slightly increased, and the opening area Sh is substantially constant at the maximum state.
And the tapping amount Q also increases at a substantially constant or slightly maximum.
At this time, the mixing ratio of the bypass water to the mixed hot water is also substantially constant
Or slightly increase. (3) In the mixing ratio adjustment range C (θ3 ≦ θ ≦ θ4), the opening surface
The product Sb increases as the valve shaft rotation angle θ increases,
The opening area Sh decreases as the valve shaft rotation angle θ increases.
As a result, the heating water and
The mixing ratio Rh with the pass water changes to control the valve shaft rotation angle θ.
It becomes possible to control the mixing ratio Rh more. (4) In the water conveyance state D (θ4 ≦ θ ≦ θ5), the opening area Sh
Is 0, and the opening area Sb is substantially constant. This allows
From the water supply channel 1 through the bypass with the heat path blocked
Water can be directly guided to the hot water path 3. Also,
In the hot water supply system of the present embodiment configured as
The control method is the same as in the first embodiment.
Therefore, the description is omitted. As described above, in the present embodiment,
According to this, in addition to the configuration described in the first embodiment, the valve
Leakage of water from the bypass to the part that opens and closes the Ipass
The valve shaft has a notch to adjust the flow rate.
In the range of movement, the notch
Since the ratio of the opening degree is substantially constant, the embodiment 1
In addition to the actions described, a fixed percentage of the hot water
The bypass water is mixed. During flow control, the supply water flows to the heating path and the bypass path.
Since the water is split, the flow rate of the hot water is reduced,
The flow velocity in the pipe (or in the valve) of the composite valve is suppressed. The target value of the temperature of the mixed hot water discharged from the
Always keep the heat exchanger at a high temperature, even if
It becomes possible. Is obtained. (Embodiment 3) FIG. 7 shows Embodiment 3 of the present invention.
It is a hot-water supply circuit diagram of a hot-water supply system. In FIG. 7, water supply
Road 1, heating path 2, bypass path 2a, tapping path 3, heating device
4, heat exchanger 5, capacity adjusting device 6, flow sensor 7, tap water
Temperature sensor 9, feed water temperature sensor 10, temperature setting device 11,
The heat exchange sensor 15 is the same as in FIG.
The explanation is omitted. Hot water supply circuit 700 of the present embodiment
2b, with hot water outlet of bypass path 2a and heating path 2
The constant bypass path which connects the near, 17 is the bypass path 2a
The valve shaft rotation angle is provided at a connection between the heating path 2 and the tapping path 3.
Mixes hot water and bypass water passing through heating path 2
Mixing ratio control function to adjust mixing ratio and shut off bypass water
A flow rate adjusting function for adjusting the flow rate of hot water passing through the heating path 2;
12 is detected by the flow sensor 7.
Detected by the feedwater flow rate and feedwater temperature sensor 10
Hot water temperature and hot water temperature detected by hot water temperature sensor 9
And the hot water temperature immediately after the heat exchanger detected by the heat exchange sensor 15
Based on the temperature and the target temperature Tc set in the temperature setting device 11,
Of the hot water temperature by controlling
It is a control unit that performs control. The always-bypass path 2b is a heating path
It is composed of a small tube with a smaller cross-sectional area compared to the cross-sectional area of 2,
5% or more and 60% or less with respect to the hot water from heating path 2, good
Preferably, 10% or more and 50% or less of bypass water flows.
To be set. Next, the hot water supply system used
The combined valve according to Embodiment 3 will be described with reference to the drawings.
explain. FIG. 8 shows a case where the hot water supply system according to the third embodiment is used.
FIG. 3 is a cross-sectional view of a main part of a composite valve having a constant bypass pipe.
You. 8, reference numeral 40 denotes a valve housing of the composite valve 17, and 1 'denotes a valve.
A water supply pipe arranged on the lower side wall of the housing 40 and connected to the water supply channel 1;
2 'is disposed at the lower end of the valve housing 40 and communicates with the water supply pipe 1' to connect with the heating path.
A water pipe connected to the water supply end of 2 and 3 'is a central part of the valve housing 40.
Hot water that is arranged on the nearby side wall and connects to the hot end of hot water channel 3
The pipe 2 "is disposed on the side wall near the upper part of the valve housing 40 and is provided with a heating path.
A hot water pipe connected to the tap end of 2 and a hot water pipe 2b '
A thin tube perforated in a valve housing 40 communicating with the tube 2 "
When the bypass pipe 46a is the hot water pipe 2 "and the constant bypass pipe 2
b 'and is always connected to the bypass pipe 2b'.
Hot water flowing in from the bypass water and hot water pipe 2 "
And an upper mixing chamber for mixing the above. In the upper mixing chamber 46a
Is a mixed hot water (hereinafter referred to as a mixed hot water)
It is called "initial mixed hot water". )make. 46b is the upper mixing chamber
Initially formed below 46a and communicates with tapping pipe 3 '
The lower mixing chamber 46c for mixing the mixed hot water and the bypass water, 46c
The water supply pipe 1 'and the water discharge pipe 2'
The water diversion chamber communicating with the hour bypass pipe 2b ', 46d
It is formed between the upper mixing chamber 46a and the lower mixing chamber 46b.
Hot water valve chamber, 46e is lower mixing chamber 46b and water distribution chamber 46c
It is a water valve room formed in between. Each valve chamber is a valve
Inside the casing 40, from above, an upper mixing chamber 46a, a hot water valve chamber 46d,
Lower mixing chamber 46b, water valve chamber 46e, water distribution chamber 46c in this order.
It is arranged on one axis. 47a is an upper mixing chamber 46a
A first hot water valve seat 47b disposed between the hot water valve chamber 46d and the hot water valve chamber 46d;
Is disposed between the hot water valve chamber 46d and the lower mixing chamber 46b.
The second hot water valve seat 47c is provided with a lower mixing chamber 46b and a water valve chamber 46.
e is a water valve seat disposed between the valve seat and the valve seat e. Upper mixing chamber 46
a and the hot water valve chamber 46d are bored at the center of the first hot water valve seat 47a.
With a circular opening through which the inserted valve element is inserted.
You. The hot-water valve chamber 46d and the lower mixing chamber 46b are a second hot-water valve seat.
47b, an upwardly facing table through which a valve body
They are connected by a par-shaped circular opening. Lower mixing chamber 4
6b and the water valve chamber 46e are formed in the center of the water valve seat 47c.
The upwardly tapered circular opening through which the inserted valve element is inserted
More communicating. The water valve chamber 46e and the water diversion chamber 46c
They are communicated with each other by an ipus tube 2a '. Round shape of each valve seat above
The central axis of the opening is coaxial. 49 is the upper part of the valve housing 40
A valve cover that fits into a valve mounting port 40a penetrated through
You. The central axis of the valve lid 49 is also the center of the circular opening of each valve seat.
Coaxial with the center. 50 is formed on the central axis of the valve lid 49.
Slidably fits up and down in the installed valve shaft mounting port 49a.
And the upper end protrudes from the valve shaft mounting port 49a.
The part is a circular opening of the first hot water valve seat 47a, the second hot water valve seat
47b into the circular opening of the water valve seat 47c.
A cylinder whose lower end extends through to the bottom in the water valve chamber 46b
A valve shaft. The lower end of the valve shaft 50 is coaxially and stepwise thin.
A cylindrical projection 50b is formed and the tip thereof is formed.
Is from the bottom of the water valve chamber 46e to the ceiling of the water diversion chamber 46c.
Slidably fits in guide hole 49b penetrated on the central axis
are doing. Reference numeral 51 denotes a valve shaft which is mounted and fixed in the middle of the valve shaft 50.
Hot water moving up and down in the hot-valve room 46d according to the movement of 50
Valve body. The hot-water valve element 51 moves up and down the valve shaft 50.
When the valve shaft 50 is displaced up and down
The first hot water valve seat 47a is closed from below and the upper mixing chamber 46 is closed.
a to shut off the flow of water between the hot water valve chamber 46d and the valve shaft 50
The second hot water valve seat 47b is closed from above when displaced to
To shut off the water flow between the hot water valve chamber 46d and the lower mixing chamber 46b.
You. Reference numeral 55 denotes a valve shaft 50 near the bottom in the lower mixing chamber 46b.
The lower mixing chamber is slidably mounted as the valve shaft 50 moves up and down.
It is a water valve body that can move up and down in 46b. 53 is a valve shaft
50 is fitted between the hot water valve element 51 and the water valve element 55.
A spring for urging the valve body 55 downward, and 52 is a water valve
A water valve body fixedly mounted on the valve shaft 50 below the body 55
55 is a stopper for preventing the valve shaft 50 from being pulled out.
You. The water valve element 55 is displaced up and down as the valve shaft 50 moves up and down.
When the valve shaft 50 is displaced to the middle position, the water valve body 55
The water valve seat 47c is closed from above to mix the water valve chamber 46e with the lower part.
The water flow to the joint room 46b is shut off, and the valve shaft 50 is further lowered.
The water valve body 55 is pressed by the water valve seat 47c and
The valve shaft 50 is slid while compressing the spring 53. 56
Is a motor for driving the valve shaft 50 in the vertical direction. More than
Of the hot water supply system according to the present embodiment
The operation of the composite valve will be described below. (1) The state where the valve shaft 50 is displaced to the highest position
Called "water-conducting state". ), The hot water valve element 51 is used for the first hot water.
The opening of the valve seat 47a is closed and the upper mixing chamber 46a is closed.
Water flow is shut off from the hot-water valve chamber 46d. At this time for water
The valve body 55 is located near the center of the lower mixing chamber 46b.
In this state, only the bypass water is supplied from the water diversion chamber 46c.
The lower mixing chamber 4 passes through the ipass pipe 2a 'and the water valve chamber 46e.
6b. Therefore, from the tapping pipe 3 ', the water supply pipe 1'
The water that flows in flows out as it is. (2) Next, the valve shaft 50 is displaced downward from the uppermost position.
The hot water valve element 51 has a first hot water valve seat 47a and a second hot water valve seat 47a.
The opening of the first hot water valve seat 47a, which is located in the middle of
The water valve 55 is opened and the water valve seat 47c is opened.
Valve shaft displacement range that does not block the section (hereinafter referred to as “mixing ratio adjustment
Called "range." In), the upper mixing chamber 46a is
Hot water from hot water pipe 2 "and always hot water from bypass pipe 2b '
The bypass water flows in and is mixed to form the initial mixed hot water.
It passes through the valve chamber 46d and flows into the lower mixing chamber 46b. This
At this time, the opening of the water valve seat 47c is also opened.
At the lower part after passing through the bypass pipe 2a 'and the water valve chamber 46e.
The bypass water also flows into the mixing chamber 46b. Therefore, the lower
The initial mixed hot water and the bypass water flow into the joint room 46b, and exit.
Mixing hot water (mixing of initial mixed hot water and bypass water)
The combined hot water flows out. At this time, the displacement of the valve shaft 50 and
Both the width of the gap between the hot-water valve element 51 and the first hot-water valve seat 47a.
(Hereinafter referred to as the “aperture width”).
The resistance changes, the flow rate of the initial mixed water changes, and the valve shaft 5
The displacement of the water valve body 55 and the water valve seat 47c together with the displacement of 0
As the width changes, the transmission resistance changes and the bypass water
The flow rate changes. Hot water valve element 51 and first hot water valve seat 47a
The width of the throttle increases in proportion to the downward displacement of the valve shaft 50.
Conversely, the throttle width between the water valve body 55 and the water valve seat 47c is
As the valve shaft 50 narrows in inverse proportion to the downward displacement, the valve
By displacing the shaft 50, the initial mixed hot water and the bypass water
Can be adjusted. (3) Further, the valve shaft 50 is displaced to the middle position,
The body 51 is formed between the first hot water valve seat 47a and the second hot water valve seat 47b.
The water valve body 55 is located in the middle of the water valve seat 47c.
In a state where the opening is closed, the first hot water valve seat 4
7a and the second hot water valve seat 47b are open, and the water valve seat 4
Since only 7c is closed, the bypass water is shut off.
Only the initial mixed hot water flows from the upper mixing chamber 46a to the hot water valve chamber 46d.
Pass through to the lower mixing chamber 46b and from the tapping pipe 3 '
The initial mixed hot water flows out. (4) Further, the valve shaft 50 is displaced downward from the middle position.
The water valve element 55 closes the water valve seat 47c,
Since the water valve body 55 is pressed against the water valve seat 47c,
A valve shaft in which the valve element 55 presses the spring 53 and is compressed.
In the displacement range (hereinafter referred to as “flow rate adjustment range”)
The hot water valve element 51 is turned into a first hot water valve in accordance with the displacement of the valve shaft 50.
The hot water valve is displaced between the seat 47a and the second hot water valve seat 47b.
A change in the throttle width between the body 51 and the second hot water valve seat 47b
As a result, the water transfer resistance changes and the flow rate of the initial mixed hot water changes.
At this time, the bypass water is shut off by the water valve 55.
I have. Accordingly, the flow of the initial mixed hot water flowing out of the tapping pipe 3 '
The amount can be controlled by the displacement of the hot water valve body 51.
You. (5) When the valve shaft is displaced to the lowest position
State. " ), The hot water valve element 51 is connected to the second hot water valve seat 47.
b, and the water valve body 55 is closed by the water valve seat 47c.
Water is cut off to close the opening. FIG. 9 (a)
Fig. 9 (b) is a graph showing a change characteristic of the mixing ratio with respect to the displacement of the valve shaft.
FIG. 5 is a characteristic diagram of a change in tapping flow rate with respect to a displacement of a valve shaft. Figure
In 9, when the valve shaft displacement x is x0, the water is introduced.
The hot water is shut off and only the bypass water flows from the tapping pipe 3 '.
It is flooded. The valve shaft displacement x is within the mixing ratio adjustment range (x0 ≦ x ≦
x1 range), as the displacement x increases,
Flow rate Qh increases and the flow rate Qb of bypass water increases to a certain value.
To decrease. When the valve shaft displacement x is x1, the flow rate Q of the hot water
h is substantially constant at the maximum. Valve shaft displacement x is the flow control range
When (x1 ≦ x ≦ x3), Qh: Qb is abbreviated.
Keeping a constant value, the amount of hot water Q (=
Qh + Qb) decreases. Water stop with valve shaft displacement x of x3
In this state, the hot water and bypass water are shut off and hot water is stopped.
I do. In the flow control range, the bypass water is heated.
5% to 60% of hot water, preferably 10% to 50%
The following is assumed. If the bypass water is 10% or less, heat exchange
In-vessel dew condensation prevention and erosion and corrosion suppression
Target if there is little stopping action and bypass water is 50% or more
If the temperature is set to the maximum set temperature, the target temperature
The temperature of the hot water required to obtain
Possible, causing boiling in the heat exchanger
Because there is a nature. The present embodiment configured as described above
In the hot water supply system according to the embodiment, a control method thereof will be described below.
Will be described. (I) In a state where the tapping water is constantly flowing (steady tapping state)
In addition, the controller 12 adjusts the displacement x of the valve shaft 50 to a flow rate.
Range B (valve shaft displacement range of x1 ≦ x ≦ x3 in FIG. 9) and
I do. At this time, the feedwater flow detected by the flow sensor 7
The amount (= tap water flow rate Q) is detected by the feedwater temperature sensor 10
Smaller than the maximum tapping flow rate limit for the supplied water temperature Tc
In this case, the control device 12 controls the valve shaft by the valve motor 56.
When the displacement is the state where the flow rate Q is maximum (in FIG. 9, x1 ≦ x ≦
x2 area), and the heat exchanger
Control of tapping temperature by adjusting the amount of heat supplied to the tank
I do. The supply water flow rate detected by the flow rate sensor 7 is
For the feed water temperature Tc detected by the water temperature sensor 10
If the maximum hot water flow rate limit is exceeded, the capacity adjusting device 6
To fix the amount of heat supplied to the heat exchanger 5 to the maximum,
The valve shaft displacement x is controlled by the motor 56 to the flow rate adjustment range (x2 ≦ x ≦
The tapping flow rate Q is adjusted by adjusting the valve shaft displacement x in x3).
To control the tapping temperature. Such control
By doing so, it is possible to prevent over-
Adjust the tap water flow rate according to the maximum tap water flow rate limit
It is possible to change the minimum value of the starting tap water flow rate.
Therefore, it is possible to maximize the capacity of the heating device
Become. (Ii) Dispensing of hot water and supply of water detected by flow sensor 7
When the water flow rate becomes zero, the temperature of the hot water in the heating path 2 is
After the hot water is stopped, it rises for a while, and then the heat of the heat exchanger 5
By being released to the outside world, the temperature of hot water in the heating path gradually increases
Descends. At this time, the control device 12
5 detected hot water temperature Th and water supply temperature sensor before hot water stop
10 from the feed water temperature Tc0 detected by
The mixing ratio of the hot water and the bypass water to the target temperature Ts
Predicted and determined, valve shaft displacement x is adjusted by valve motor 56 to mix ratio
The adjustment is performed in the node range (x0 ≦ x ≦ x1). like this
Control when the hot water is restarted.
To prevent hot water from being discharged by the "bounce phenomenon".
It becomes possible. (Iii) Restart hot water supply and stay in heating path 2 by supplying water
The hot water that has been replaced is almost replaced and supplied from the heat exchanger 5
The calorific value is almost stable, and the tapping temperature Tm detected by the tapping temperature sensor 9
When the detected value is stabilized, the control device 12
The valve shaft displacement x to the flow rate adjustment range (x2 ≦ x ≦ x3)
Then, the control is shifted to the control in the steady tapping state. (Iv) The water supply channel 1 with the heating device 4 stopped.
When water is passed through the hot water path 3 from the
By 56, the valve shaft displacement x is set to a displacement x0 in the water guiding state. This
By performing such control as described above, the low-temperature water is supplied to the heat exchanger 5.
Water from the water supply channel 1 to the hot water channel 3 without passing
Is formed, and dew condensation occurs inside the heat exchanger 5, soot
Prevent clogging and low temperature corrosion
Becomes possible. As described above, according to the present embodiment,
In addition to the configuration described, heat from the bypass or water supply and heating
To the hot water supplied from the heating path by communicating with the downstream side of the exchanger.
Bypass or supply at a flow rate that is approximately constant to the flow rate of hot water
Provision of a constant bypass for mixing water from waterways
Thus, in addition to the operation described in the first embodiment, in the flow rate adjustment range, the water pressure in the water supply passage is
Is higher than the hot water,
Water is supplied and mixed, the set temperature is low
The heat exchanger can always be kept hot
It works. During flow control, the supply water flows to the heating path and the bypass path.
Since the water is split, the flow rate of the hot water is reduced,
The flow velocity in the pipe (or in the valve) of the composite valve is suppressed. The target value of the temperature of the mixed hot water discharged from the
Always keep the heat exchanger at a high temperature, even if
It becomes possible. Is obtained.

As described above, according to the hot water supply system according to the first aspect, the water supply passage for supplying water, the heat exchanger heated by the heating device, the communication between the water supply passage and the heat exchanger. A heating channel for water, a bypass channel diverted from the water supply channel,
Opening of the heating passage by operating one valve shaft that communicates with the heating passage, the bypass passage, and the tapping water passage, and that communicates with the heating passage, the bypass passage, and the tapping water passage. And a compound valve having a valve body for adjusting the degree of opening of the bypass passage and the degree of opening of the bypass passage. The compound valve has a valve shaft movement amount range for adjusting the flow rate and a valve shaft movement amount range for adjusting the mixing ratio. The valve element closes the bypass and adjusts the opening degree of the heating path in the valve shaft movement amount range for performing the flow rate adjustment, and adjusts the opening degree of the bypass passage in the valve shaft movement amount range for performing the mixing ratio adjustment. By adjusting the ratio to the degree of opening of the heating path, the "temperature jump phenomenon" is suppressed, and it is possible to prevent over-flow, and the heating apparatus can be operated in the entire range below the maximum tapping flow rate limit of the heating apparatus. It can be used, the hot water supply circuit is simple, excellent in reliability and maintainability, Hot water circuit is compact, advantageous effect that it is possible to provide a producible hot water system can be obtained at low cost. Also,
According to the second aspect of the present invention, in the hot water supply system according to the first aspect, the valve body has a notch with respect to the opening degree of the heating path in a valve shaft movement amount range in which a flow rate is adjusted in a portion that opens and closes the bypass path. In addition to the effect of claim 1, by providing a cut-out portion for leaking water from the bypass such that the ratio of the opening degree of the portion is substantially constant, erosion and the like in the heat exchanger and the composite valve are provided. Corrosion is suppressed and the heat exchanger is always kept at a high temperature, preventing condensation from occurring in the heat exchanger even in a high-humidity environment, preventing soot clogging and low-temperature corrosion, resulting in low-cost production An advantageous effect that a possible hot water supply system can be provided is obtained. Also,
According to the third aspect of the present invention, in the hot water supply system according to the second aspect, in the notch portion, the flow rate of the water leaked from the bypass passage in the range of the valve shaft movement amount in which the flow rate is adjusted is increased from the heating passage. 5% or more and 60% or less with respect to the flow rate of hot water,
Preferably, it is formed so as to be 10% or more and 50% or less, and in addition to the effect described in claim 2, it is possible to provide a hot water supply system in which boiling in the heat exchanger is prevented. Is obtained. According to the fourth aspect of the present invention, in the hot water supply system according to the first aspect, the bypass path or the water supply path and the downstream side of the heat exchanger of the heating path communicate with each other and are supplied from the heating path. The hot water is provided with a constant bypass which mixes the water from the bypass or the water supply at a flow rate substantially constant with respect to the flow rate of the hot water. Erosion and corrosion in the valve are suppressed,
Even in a high-humidity environment, dew condensation in the heat exchanger is unlikely to occur, so that the occurrence of soot clogging and low-temperature corrosion is prevented, and the advantageous effect that a low-cost production hot water supply system can be provided is obtained. Can be According to the fifth aspect of the present invention, in the hot water supply system according to the fourth aspect, the always-bypass path has a flow rate of water in the always-bypass path of 5% or more with respect to a flow rate of hot water from the heating path. %, Preferably 10% or more and 50% or less, in addition to the effect described in claim 4, is advantageous in that it is possible to provide a hot water supply system in which boiling in the heat exchanger is prevented. The effect is obtained. According to a sixth aspect of the present invention, in the hot water supply system according to any one of the first to fifth aspects, the composite valve has a valve shaft movement amount range for conducting water, and the valve body is In addition to the effect according to any one of claims 1 to 5, by closing the heating path and opening only the bypass path in the valve shaft movement amount range for conducting water, the heater is stopped and the hot water is discharged. When the supply water is directly introduced into the passage, dew condensation in the heat exchanger is unlikely to occur, so that an advantageous effect that a hot water supply system in which the occurrence of soot clogging and low-temperature corrosion is suppressed can be provided can be obtained. . Also,
According to the control method of the hot water supply system described in claim 7, a flow rate sensor for detecting a flow rate of water in the water supply path, a water supply temperature sensor for detecting a water temperature of the water supply path, and a heat sensor for detecting a water temperature immediately after the heat exchanger. An intersection sensor, a temperature setting device for setting a target value of the temperature of the mixed hot water discharged from the hot water path, a valve motor for driving a valve shaft of the composite valve, and a capability adjusting device for adjusting a heating amount of the heating device, And a control device for controlling the valve motor and the capacity adjusting device based on detection values of the flow rate sensor, the feed water temperature sensor, and the heat exchange sensor and a target value of the temperature set by the temperature setting device. 7. The method for controlling a hot water supply system according to claim 6, wherein in a steady tapping state, the control device adjusts a flow rate by adjusting a valve shaft moving amount of the composite valve and adjusts a heating amount by a capacity adjusting device. Control the temperature and In the stopped state, the control device sets the target value of the temperature set by the temperature setting device based on the temperature of the hot water immediately after the heat exchanger detected by the heat exchange sensor and the water temperature of the water supply channel detected by the water supply temperature sensor. A simple hot water supply circuit by controlling the valve shaft movement amount of the composite valve and adjusting the mixing ratio between the hot water and the bypass water in advance to perform the predictive control of the tapping temperature when tapping is resumed. And a control method of the hot water supply system which can be realized by the control circuit is advantageously provided. Also,
According to the composite valve used in the hot water supply system according to claim 8, a composite valve used for mixing hot and cold water in the hot water supply system, the valve housing and a water inlet formed inside the valve housing and supplied with water. A valve chamber communicating with a hot water supply port for supplying hot water and a hot water outlet for discharging a mixed hot water mixed with hot water and water, a rotatable valve shaft inserted into a valve housing, and a valve chamber. A valve body in which a mixing chamber is formed so as to be rotatably fitted and rotated by a valve shaft and opened to the inside of the tap hole, a water inlet port penetrating from the outer wall of the valve body to the mixing chamber, and a water inlet port And a hot water inlet penetrating from the outer wall of the valve body to the mixing chamber at a position shifted in the direction of the rotation axis of the valve body and the direction of rotation of the valve body with respect to the position of a. When the valve shaft is at the water guide angle position, the hot water inlet is closed by the valve chamber wall, the water inlet overlaps with the water inlet, and b. When the valve shaft is at the mixing ratio adjusting angle position, the hot water inlet partially overlaps with the hot water inlet, and the water inlet partially overlaps with the hot water outlet; c. When the valve shaft is in the flow control angle position, the hot water inlet partially overlaps with the spout, the water inlet is closed by the valve chamber wall, or the hot water inlet partially overlaps with the hot spout. The water inlet partially overlaps with the water inlet, and the ratio of the area where the water inlet and the hot water inlet and the area where the water inlet and the water inlet overlap is substantially constant; d. When the valve shaft is in the closing angle position, the hot water inlet is closed by the valve chamber wall, and the water inlet is closed by the valve chamber wall. It is possible to perform a flow rate control for preventing the hot water supply system from flowing out of excess and a mixing ratio control for preventing the "temperature splash phenomenon" by rotating one valve shaft. A valve can be provided, and the advantageous effects described above can be obtained in which the flow control of the hot water supply system can be performed by one valve motor, and the control mechanism can be simplified. Can be According to the compound valve used in the hot water supply system according to claim 9, a compound valve used for mixing hot and cold water in the hot water supply system, wherein the hot water supply port and the water supply port are provided. And a tap for discharging a mixed hot water in which hot water and water are mixed,
A mixing chamber formed inside the valve housing and communicating with the tap hole and the water inlet; a valve chamber formed inside the valve housing and communicating with the mixing port and the mixing chamber; A valve shaft inserted into the hot-water valve chamber and the mixing chamber and reciprocally movable in the axial direction; a water valve plug loosely inserted in the valve shaft and reciprocally movable in the axial direction of the valve shaft in the mixing chamber; A water valve seat disposed between the chamber and the water introduction port to form a water valve together with the water valve body; and a spring loosely inserted into the valve shaft to bias the water valve body in the direction of the water valve seat. A stopper fixed to the valve shaft to prevent the water valve body from coming off the valve shaft, and a hot water valve body attached to the valve shaft and capable of reciprocating in the axial direction of the valve shaft in the hot water valve chamber. A first hot water valve seat that is disposed between the hot water inlet and the hot water valve chamber and that forms a first hot water valve together with the hot water valve element;
A second hot-water valve seat disposed between the hot-water valve chamber and the mixing chamber to form a second hot-water valve together with the hot-water valve element; a. When the valve shaft is in the water-guiding position, the hot water valve body is closely fitted to the first hot water valve seat, the first hot water valve is closed, and the water valve body is separated from the water valve seat and the water valve is closed. Is opened, b. When the valve shaft is in the mixing ratio adjusting position, the hot water valve body is located between the first hot water valve seat and the second hot water valve seat, and the first hot water valve and the second hot water valve are open. The valve for water is released from the water valve seat, the water valve is opened, and c. When the valve shaft is in the flow control position, the hot water valve body is located between the first hot water valve seat and the second hot water valve seat, and the first hot water valve and the second hot water valve are opened. The water valve body is closely fitted to the water valve seat, the water valve is closed, and d. When the valve shaft is in the closed position, the hot water valve body is closely fitted to the second hot water valve seat, the second hot water valve is closed, and the water valve body is closely fitted to the water valve seat. Since the valve is closed, it is possible to close the hot water outlet if you want to flow water to the hot water outlet, and to control the flow rate to prevent the hot water supply system from overflowing and prevent the "temperature splash phenomenon" To provide a composite valve capable of performing the mixing ratio control for controlling the hot water supply system by the rotation of one valve shaft. And the advantageous effect that the control mechanism can be simplified can be obtained. Claim 10
According to the invention described in the above, in the composite valve according to the ninth aspect, the valve housing is provided with a constant bypass pipe that connects the water inlet and the hot water inlet, thereby providing the effect according to the eighth aspect. In addition, since the temperature of the mixed hot water discharged from the hot water outlet is always lowered by the water supplied from the bypass passage, even when it is necessary to discharge low-temperature hot water, the temperature of the hot water supplied from the hot water supply port is reduced. The advantageous effect of being able to increase is obtained.

[Brief description of the drawings]

FIG. 1 is a hot water supply circuit diagram of a hot water supply system according to Embodiment 1 of the present invention.

FIG. 2A is a sectional view of a main part of a composite valve used in the hot water supply system according to the first embodiment; FIG.

FIG. 3 is an operation schematic diagram of a valve body of a composite valve used in the hot water supply system according to the first embodiment.

FIG. 4 (a) is a diagram showing a change characteristic of a mixing ratio with respect to a valve shaft rotation angle of a composite valve used in the hot water supply system according to the first embodiment; Diagram of change in tapping flow rate with shaft rotation angle

FIG. 5 (a) is a diagram showing a change characteristic of a mixing ratio with respect to a valve shaft rotation angle of a composite valve used in a hot water supply system according to a second embodiment of the present invention; Characteristics of change of tap water flow rate with respect to valve shaft rotation angle

FIG. 6 is an operation schematic diagram of a valve body of a composite valve used in the hot water supply system according to the second embodiment.

FIG. 7 is a hot water supply circuit diagram of a hot water supply system according to Embodiment 3 of the present invention.

FIG. 8 is a sectional view of a main part of a composite valve having a constant bypass pipe used in the hot water supply system according to the third embodiment;

FIG. 9A is a characteristic diagram showing a change in the mixing ratio with respect to the displacement of the valve shaft. FIG.

FIG. 10 is a hot water supply circuit diagram of a conventional hot water supply system.

FIG. 11 is a hot water supply circuit diagram of a conventional hot water supply system disclosed in Japanese Patent Publication No.

FIG. 12 is a hot water supply circuit diagram of a conventional hot water supply system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water supply path 1 'Water supply pipe 2 Heating path 2' Water discharge pipe 2 "Hot water supply pipe 2a Bypass path 2a 'Bypass pipe 2b Always bypass path 2b' Always bypass pipe 3 Hot water path 3 'Hot water pipe 4 Heating device 5 Heat exchanger 6 Capacity adjusting device 7 Flow rate sensor 8 Overflow prevention valve (water governor) 9 Hot water temperature sensor 10 Supply water temperature sensor 11 Temperature setting device 12 Control device 13 Water volume control valve 14 Mixing valve 15 Heat exchange sensor 16, 17 Composite valve 23 Valve body 23a Valve shaft 24 Mixing chamber 26 Hot water inlet 26a Water inlet 27 Water inlet 27a Water inlet 27b Notch 28 Hot water outlet 29 Valve housing 29a Mounting flange (flange joint) 30 Water supply temperature sensor mounting port 40 Valve housing 40a Valve mounting Mouth 46a Upper mixing chamber 46b Lower mixing chamber 46c Water distribution chamber 46d Hot water valve chamber 46e Water valve chamber 47a First hot water valve seat 47b Second hot water valve seat 7c water valve seat 49 the valve cover 49a valve shaft attachment hole 49b guide hole 50 valve shaft 50b protruded column 51 water valve element 52 the stopper 53 spring 55 water valve body 56 valve motor 700 hot water supply circuit

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[Procedure amendment]

[Submission date] June 1, 1999 (1999.6.1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Title: Hot water supply system, control method therefor, and composite valve used for the same

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water supply system.

[0002]

2. Description of the Related Art In recent years, hot water supply systems have been widely used in baths, kitchens, and the like, in which hot water at a set temperature is immediately discharged simply by setting a temperature and opening a faucet.
Such a hot water supply system is widely used in ordinary households, and there is a demand for a hot water supply system with low cost, durability, and excellent maintainability.

[0003] A conventional hot water supply system will be described below. (1) FIG. 10 is a hot water supply circuit diagram of a conventional hot water supply system. In FIG. 10, reference numeral 1 denotes a water supply path for supplying water to a hot water supply circuit, 2 denotes a heating path that includes a heat exchanger 5 that communicates with the water supply path and is heated by a heating device 4, and heats the supplied water. This is a hot-water outlet for hot water that flows through the hot water.
In the heating device 4, the amount of heating given to the heat exchanger is adjusted by the capacity adjusting device 6. Reference numeral 7 denotes a flow sensor disposed near the water supply end of the heating path 2 and detects a flow rate of water supplied to the heating path. Reference numeral 8 denotes an overflow prevention valve disposed near the water supply end of the heating path 2 for preventing an overflow of the water supply circuit. (Water governor), 9 is a tap water temperature sensor that is disposed in tap channel 3 and detects the temperature of hot water to be supplied, 10 is a tap water temperature sensor that is disposed at the feed end of heating path 2 and detects tap water temperature, and 11 is a tap water temperature sensor. A temperature setting device 12 for setting a target temperature of hot water to be requested is provided with a water supply flow rate detected by the flow rate sensor 7, a water supply temperature detected by the water supply temperature sensor 10, a tap water temperature detected by the discharge temperature sensor 9, and a temperature setter. This is a control device that controls the capacity adjusting device 6 based on the target temperature Ts set to 11 and controls the tapping temperature.

[0004] In the above conventional hot water supply system configured as described, operation is described below.

[0005] First, when starting the hot water After the target temperature is set by the temperature setting device 11, the controller 12 adjusts the amount of heating by capacity regulating device 6 based on the water temperature and the target temperature detected by the feedwater temperature sensor 10 And heating device 4
Starts and starts heating. Next, when the state shifts to the steady state, the control device 12 adjusts the heating amount by the capacity adjusting device 6 based on the feed water temperature detected by the feed water temperature sensor 10, the target temperature, and the tap water temperature detected by the tap water temperature sensor 9.

[0006] (2) FIG. 11 is a hot water supply circuit diagram of a conventional hot-water supply system disclosed in KOKOKU 7-18562 Patent Publication (hereinafter referred to as "y JP".).

In FIG . 11, a water supply channel 1, a heating channel 2, a tapping channel 3, a heating device 4, a heat exchanger 5, a capacity adjusting device 6, a flow rate sensor 7, an overflow prevention valve 8, a tapping temperature sensor 9, and a feed water temperature. The sensor 10 and the temperature setting device 11 are the same as those in (1), and are denoted by the same reference numerals and description thereof is omitted.

[0008] hot water supply circuit of this conventional example, a bypass passage 2a arranged in parallel with the water supply passage 1 and the hot water passage 3 and communicating heat exchanger 5, the water flowing through the bypass passage (hereinafter "bypass water" The water flow control valve 13 for adjusting the flow rate
And a water supply temperature detected by the water supply temperature sensor 10 according to the temperature set by the temperature setting device 11, a water supply amount detected by the flow rate sensor 7, and a tap water temperature detected by the tap water temperature sensor 9. And a control device 12 for controlling the water flow control valve 13.

In the conventional hot water supply system configured as described above, the control device 12 activates the capacity adjusting device 6 based on the signals of the feed water temperature sensor 10, the flow rate sensor 7, and the hot water temperature sensor 9, and also controls the hot water temperature sensor 9. The tapping temperature is controlled by controlling the amount of urging of the urging means of the water amount adjusting valve 13 in proportion to the temperature deviation between the temperature setting device 11 and the water supply amount.

[0010] (3) FIG. 12 is a hot water supply circuit diagram of the hot water system of a conventional example. In FIG. 12, a water supply channel 1, a heating channel 2, a bypass channel 2a, a tapping channel 3, a heating device 4, a heat exchanger 5, a capacity adjusting device 6, a flow rate sensor 7, a tapping temperature sensor 9, a feed water temperature sensor 10, and a temperature setting As for the vessel 11,
This is the same as (2), and the description is omitted by assigning the same reference numerals.

[0011] hot water supply circuit of this conventional example, the mixing valve 14 to adjust the mixing ratio between hot and the bypass water is disposed to the junction of the bypass passage 2a and the heating passage 2 and pouring passage 3, distribution in hot water passage A water flow control valve 13 for adjusting the amount of hot water, a water supply flow rate detected by the flow rate sensor 7 and a water supply temperature sensor 10
The capacity adjusting device 6 and the water amount adjusting valve 13 based on the water supply temperature detected by the water supply temperature detected by the hot water temperature sensor 9 and the target temperature Ts set in the temperature setting device 11.
And a controller 12 for controlling the mixing valve 14 to control the tapping temperature.

[0012] In the above conventional hot water supply system configured as described, the operation thereof will be described below.

[0013] First of all, when you start tapping, the control device 12
Determines a heating amount and a mixing ratio of bypass water corresponding to the set temperature of the temperature setting device 11 from the feed water flow rate detected by the flow rate sensor 7 and the feed water temperature detected by the feed water temperature sensor 10, 6 and the operation of the mixing valve 14 are controlled to adjust the heating amount and the mixing ratio of the bypass water.
Next, when the heating device 4 shifts to the steady heating state, the control device 12 adjusts the mixing valve 14, shuts off the bypass passage 2a and supplies hot water only from the heating passage 2, and at the same time, adjusts the capacity adjustment device 6 and the water amount adjustment. The temperature is controlled by adjusting the valve 13.

[0014] (4) As a conventional example of a conventional hot-water supply system, JP-A 7-158965 Patent Publication (hereinafter "B No."
Call. In the mixing type hot water supply system that mixes hot water from the heat exchanger and branch water (bypass water) from the water supply channel to a set hot water supply temperature and supplies hot water, a hot water supply joint of the mixing hot water supply system A mixing-type hot water supply system comprising a branch tap for connecting a dishwasher having a valve mechanism for stopping branch water from a road and flowing only hot water from a heat exchanger to the dishwasher ''. I have.

[0015] (5) As a conventional example of a control method of the conventional hot-water supply system, JP-A 7-243700 Patent Publication (hereinafter referred to as "Ha No.".) To the "hot-water supply system temperature to control the hot water temperature from the hot water system In the control method, the water supply system is characterized in that a water proportional valve is squeezed to limit the amount of hot water during a period from a start of the combustion operation to a steady combustion and until the hot water temperature reaches the set temperature. A temperature control method "is disclosed.

[0016]

However, the above-described conventional hot water supply system has the following problems.

[0017] a. When using a hot water supply system in a bath, etc.,
It is conceivable that only water flows out of the hot water path. In such a case, in the conventional hot water supply system described in (1), since low-temperature water passes through the heat exchanger with the heater stopped, dew condensation occurs inside the heat exchanger, and soot clogging and low-temperature corrosion may occur. There was a problem that it occurred.

[0018] b. In the case where the hot water supply system is temporarily stopped after the hot water supply system is used, and the hot water supply is started again after a relatively short time (about several minutes), while the hot water supply is stopped, the heat exchanger is heated by its own residual heat. A phenomenon called so-called "post-boiling" occurs in which the hot water retained in the exchanger is heated to raise the temperature of the hot water. At this time, the temperature of the hot water in the heat exchanger is 7
It will be about 0 ° C to 90 ° C. When tapping is resumed in this state, the temperature of the tapping water flowing out of the heating path is pulsed only for a short time (the time until almost all of the hot water staying in the heat exchanger is replaced) after a lapse of a certain time from the start of tapping. A “temperature jump phenomenon” that rapidly rises occurs. In particular, in recent years, it has been required that the “temperature jump phenomenon” be suppressed to within + 2 ° C. However, in the conventional hot water supply systems described in (1), (2), and (4), since accurate feedforward control of the tapping temperature cannot be performed, it is possible to prevent a “temperature jump phenomenon” in the tapping water temperature. There was a problem that it was not possible.

C. Since the heating capacity of the heating device is limited,
There is an upper limit of the flow rate at which hot water can be discharged per unit time with respect to the set target temperature. As the target temperature increases, the upper limit value (hereinafter, referred to as “maximum tapping flow rate limit”) decreases. When the hot water is discharged beyond the maximum hot water flow rate limit, the required amount of heat exceeds the heat supply capacity of the heating device, so that a hot water having a temperature lower than the target temperature flows out, that is, a phenomenon called "overflow" occurs. The conventional hot water supply system described in (4) has a problem that the overflow cannot be prevented.

D. The conventional hot water supply systems described in (1) and (2) are provided with an overflow prevention valve to prevent the above-mentioned overflow, but overflow in all target temperature ranges that may be set. It is necessary to set the upper limit of the flow rate of the overflow prevention valve in accordance with the maximum hot water flow rate limit of the highest temperature that can be set (hereinafter, referred to as “maximum set temperature”). Therefore, even if the target temperature is set to a low temperature, it is not possible to make the hot water flow at a flow rate higher than the maximum hot water flow rate limit at the maximum set temperature, so that there is a problem that the capacity of the heating device cannot be sufficiently used. Was. In general, tap water is often used as water to be supplied, but the supply water temperature differs between summer and winter, and the maximum hot water flow rate limit in winter is lower than the maximum hot water flow rate limit in summer.
Therefore, in a hot water supply system used over a year, it is necessary to set the upper limit of the flow rate of the overflow prevention valve in accordance with the maximum tap water flow rate limit with respect to the maximum set temperature in the winter water supply temperature. In the case where the temperature is set at a low temperature, there is a problem that the capability of the heating device cannot be sufficiently used for the same reason as described above.

E. The conventional hot water supply system described in (3) includes a mixing valve that performs adjustment for mixing bypass water and a water amount control valve that performs adjustment for preventing overflow in order to prevent a “temperature splash phenomenon”. However, since the hot water supply circuit requires two electric valves (mixing valve and water flow control valve) and requires a control mechanism for controlling each of them, there is a problem that the hot water supply circuit cannot be made compact. Was.

[0022] f. In the conventional hot water supply system described in (3), two electric valves (mixing valve and water flow control valve) are provided in the hot water supply circuit.
And a control mechanism (such as a valve motor) for controlling them is required, so that the hot water supply circuit is complicated, easily broken, and has a problem in reliability.

[0023] g. The conventional hot water supply system described in (3) has a problem that the hot water supply circuit is complicated, the maintenance work is complicated, and the maintainability is poor.

Further , the above-described conventional hot water supply system control method has the following problems.

H. The control method of the conventional hot water supply system described in (5) has a problem that the “temperature jump phenomenon” in the temperature of the hot water to be discharged cannot be prevented.

The hot water supply system of the present invention is to solve the conventional problems described above, it is possible to prevent dew condensation inside the heat exchanger, it is possible to prevent "Temperature bouncing phenomenon", over outflow Can be used, and the capacity of the heating device can be used over the entire range below the maximum tapping flow rate limit, and the hot water supply circuit is simple, excellent in reliability and maintainability, and compact. Therefore, an object of the present invention is to provide a hot water supply system that can be produced at low cost.

Further, a control method of a hot water supply system according to the present invention solves the above-mentioned conventional problems and can prevent a "temperature jump phenomenon", and can be realized by a simple configuration. The purpose is to provide.

Further, the composite valve used in the hot water supply system of the present invention can prevent dew condensation inside the heat exchanger, and can prevent a "temperature splash phenomenon".
It is possible to prevent overflow and to use the capacity of the heating device over the entire range below the maximum tapping flow rate limit.
It is an object of the present invention to provide a composite valve used for a hot water supply system that can be made compact.

[0029]

In order to solve the above-mentioned problems, a hot water supply system according to the present invention comprises a water supply passage for supplying water, a heat exchanger heated by a heating device, and a heat exchanger connected to the water supply passage. A heating path through which water flows, a bypass path diverted from a water supply path, a hot water path for supplying mixed hot water in which hot water from the heating path and water from the bypass path are mixed to a hot water outlet, a heating path and a bypass path And a compound valve having a valve body that communicates with the hot water path and controls the opening degree of the heating path and the opening degree of the bypass path by operating one of the valve shafts. The valve body has a shaft movement amount range and a valve shaft movement amount range for adjusting the mixing ratio, and the valve element closes the bypass passage in the valve shaft movement amount range for adjusting the flow rate, adjusts the opening degree of the heating path, and mixes The opening degree of the bypass passage and the opening of the heating passage in the range of the valve shaft movement amount that performs the ratio adjustment Consisting configuration and to perform the adjustment of the ratio of the.

According to this configuration, it is possible to prevent dew condensation inside the heat exchanger, to prevent the "temperature jump phenomenon", prevent over-spill, and reduce the temperature of the heating device. A hot water supply system that can be used over the entire range below the maximum hot water flow rate limit, has a simple hot water supply circuit, has excellent reliability and maintainability, can be made compact, and can be produced at low cost. Can be provided.

In order to solve the above problems, a control method of a hot water supply system according to the present invention comprises a flow rate sensor for detecting a flow rate of water in a water supply path, a water supply temperature sensor for detecting a water temperature in the water supply path,
A heat exchange sensor for detecting the temperature of the water in the heat exchanger, a temperature setting device for setting a target value of the temperature of the mixed hot water discharged from the tapping channel, a valve motor for driving the valve shaft of the composite valve, and a heating device. A capacity adjusting device for adjusting the heating amount, and a control for controlling the valve motor and the capacity adjusting device based on the detection values of the flow rate sensor, the feed water temperature sensor, and the heat exchange sensor, and the target value of the temperature set by the temperature setting device. And a control device for the hot water supply system according to any one of claims 1 to 6, further comprising: a device for adjusting a flow rate by adjusting a valve shaft movement amount of the combined valve in a steady hot water supply state. The temperature of the hot water is controlled by adjusting the amount of heating by the capacity adjusting device. When the hot water is stopped, the control device controls the temperature of the hot water immediately after the heat exchanger detected by the heat exchange sensor and the water supply channel detected by the water temperature sensor. Water temperature and The tapping temperature at which tapping is resumed by adjusting the valve shaft movement of the composite valve in accordance with the target value of the temperature set by the temperature setter and adjusting the mixing ratio between the hot water and the bypass water in advance. Is performed.

[0032] Thus, it is possible to provide the control of only the valve shaft movement amount of the combined valve, the control method capable hot water system to prevent the excessive outflow as a "temperature bouncing phenomenon".

The combined valve for use in hot water supply system of the present invention to solve the aforementioned problems is a combined valve for use in mixing faucet of hot water supply system, and the valve housing, the water is Katachi設inside valve housing A valve chamber communicating with a water supply port to be supplied, a water supply port to which the hot water is supplied, and a discharge port from which a mixed hot water mixed with water is discharged; and a rotatable valve shaft inserted into the valve housing and rotatable. A valve body formed with a mixing chamber which is rotatably fitted to the valve chamber and is rotated by the valve shaft and opens to the inside of the tap hole, and a water flow penetrating from the outer wall of the valve body to the mixing chamber. An inlet, and a hot water inlet penetrating from the outer wall of the valve body to the mixing chamber at a position shifted in the direction of the rotation axis of the valve body and the direction of rotation of the valve body with respect to the position of the water inlet, a. When the valve shaft is at the water guide angle position, the hot water inlet is closed by the valve chamber wall, the water inlet overlaps with the water inlet, and b. When the valve shaft is at the mixing ratio adjusting angle position, the hot water inlet partially overlaps with the hot water inlet, and the water inlet partially overlaps with the hot water outlet; c. When the valve shaft is in the flow control angle position, the hot water inlet partially overlaps with the spout, the water inlet is closed by the valve chamber wall, or the hot water inlet partially overlaps with the hot spout. The water inlet partially overlaps with the water inlet, and the ratio of the area where the water inlet and the hot water inlet and the area where the water inlet and the water inlet overlap is substantially constant; d. When the valve shaft is at the closing angle position, the hot water inlet is closed by the valve chamber wall, and the water inlet is closed by the valve chamber wall.

[0034] Thus, if the desired flow of water to the tap hole,
It is possible to close the hot water outlet, connect the hot water outlet to the bypass, connect the hot water outlet to the heating channel, and connect the hot water outlet to the hot water outlet. It is possible to provide a composite valve capable of performing the control and the mixture ratio control for preventing the “temperature jump phenomenon” by rotating one valve shaft.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A hot water supply system according to a first aspect of the present invention includes a water supply path for supplying water, a heat exchanger heated by a heating device, and a water supply path connected to the water supply path. Heating path, a bypass path diverted from the water supply path, a hot water path for feeding mixed water in which hot water from the heating path and water from the bypass path are mixed to the hot water outlet, a heating path, a bypass path, and a hot water path And a compound valve having a valve body that adjusts the opening degree of the heating path and the opening degree of the bypass path by operating one of the valve shafts. A range and a valve shaft movement amount range for adjusting the mixture ratio, and the valve element has:
In the valve shaft movement amount range for adjusting the flow rate, the bypass passage is closed and the opening degree of the heating path is adjusted, and in the valve shaft movement amount range for adjusting the mixing ratio, the opening degree of the bypass passage and the opening degree of the heating passage are adjusted. It is characterized by adjusting the ratio of

The flow rate of hot water (hereinafter, referred to as "hot water") from the heating path is controlled by operating the valve shaft in a valve shaft movement amount range for controlling the flow rate (hereinafter, referred to as "flow rate adjustment range"). It is possible to do.

[0037] (hereinafter referred to as "mixing ratio adjustment range".) Valve stem movement amount range for the mixing ratio adjusting water from the bypass passage by operating the valve axis (hereinafter referred to as "bypass water".) And pressurized It is possible to adjust the mixing ratio with hot water.

[0038] it is possible to perform both the mixing ratio adjusted to the flow rate adjusted by operating a valve-axis travel of shaft one valve. It has the action of:

[0039] Here, the valve shaft movement amount is that of the rotation angle or displacement of the valve shaft, the valve shaft rotation angle of the valve stem in the composite valve is rotated to operate the valve body about the valve shaft In a composite valve that operates a valve element by linearly displacing in the axial direction of the valve shaft, the displacement amount of the valve shaft is the valve shaft movement amount.

The hot-water supply system according to claim 2 of the present invention is a hot water supply system of claim 1, the valve body,
Notch for leaking water from the bypass such that the ratio of the opening of the notch to the opening of the heating path is substantially constant in the range of the valve shaft movement in which the flow rate is adjusted in the portion that opens and closes the bypass. With this configuration, in addition to the function of claim 1,

In the flow rate adjustment range, the bypass water is mixed with the hot water at a constant rate.

During the flow rate control, the supply water is divided into the heating path and the bypass path, so that the flow rate of the hot water is suppressed, and the flow velocity in the pipe of the heat exchanger or the composite valve (or in the valve) is suppressed.

Even when the target value of the temperature of the mixed hot water discharged from the hot water outlet path is set low, the heat exchanger can always be maintained at a high temperature. It has the action of:

The hot-water supply system according to claim 3 of the present invention is a hot water supply system according to claim 2, notch, in the valve shaft movement amount range for flow rate adjustment, the water is leaking from the bypass passage Is 5% or more and 60% or less, preferably 10% or more and 50% or less of the flow rate of hot water from the heating path.
According to this configuration, erosion and corrosion in the heat exchanger and the composite valve are suppressed, and the inside of the heat exchanger is reduced. Has the effect of preventing boiling at the bottom.

The hot-water supply system according to claim 4 of the present invention is a hot water supply system according to claim 1, from the bypass passage or the water supply passage and communicates the downstream side of the heat exchanger of the heating circuit heating circuit The hot water to be supplied is provided with a constant bypass which mixes the water from the bypass or the water supply at a flow rate substantially constant to the flow rate of the hot water. In addition to the actions described,

In the flow rate control range, the water pressure in the water supply passage is higher than the water pressure in the heating passage. Therefore, water is supplied from the water supply passage at a constant rate to the hot water and mixed therewith, so that when the set temperature is low. It is also possible to keep the heat exchanger always at a high temperature.

During the flow rate control, the supply water is divided into the heating path and the bypass path, so that the flow rate of the hot water is suppressed, and the flow velocity in the pipe (or the valve) of the heat exchanger or the composite valve is suppressed.

The hot-water supply system according to claim 5 of the present invention is a hot water supply system according to claim 4, is always bypass passage with respect to the flow rate of the hot water from the flow of water at all times bypass the heating path 5% or more and 60% or less, preferably 10%
According to this configuration, erosion and corrosion in the heat exchanger and the composite valve are suppressed, and boiling in the heat exchanger is reduced. It has the effect of being prevented.

The hot-water supply system according to claim 6 of the present invention is a hot water supply system according to any one of claims 1 to 5, combined valve may have a valve shaft movement amount range for water guide The valve element closes the heating path and opens only the bypass path in a valve shaft movement amount range for conducting water. With this configuration, the valve element according to any one of claims 1 to 5, In addition to the operation described above, when the heater is stopped and the supply water is directly supplied to the tap water path, the heating path can be shut off and water can be supplied through the bypass path, thereby preventing condensation of the heat exchanger. Having.

According to a seventh aspect of the present invention, there is provided a method for controlling a hot water supply system, comprising: a flow rate sensor for detecting a flow rate of water in a water supply path, a water supply temperature sensor for detecting a water temperature in the water supply path, and a water temperature immediately after the heat exchanger. And a temperature setting device for setting a target value of the temperature of the mixed hot water discharged from the hot water path,
A valve motor for driving the valve shaft of the composite valve, a capacity adjusting device for adjusting the heating amount of the heating device, a detection value of the flow rate sensor, the feed water temperature sensor and the heat exchange sensor, and a temperature target set by the temperature setting device. The control method for the hot water supply system according to any one of claims 1 to 6, further comprising: a control device that controls the valve motor and the capacity adjusting device based on the value. The device controls the tapping temperature by adjusting the flow rate by adjusting the valve shaft moving amount of the combined valve and the heating amount by the capacity adjusting device. When the tapping is stopped, the control device is a heat exchanger detected by a heat exchange sensor. Based on the temperature of the hot water immediately after and the water temperature of the water supply channel detected by the water supply temperature sensor, the valve shaft movement of the composite valve is adjusted in accordance with the target value of the temperature set by the temperature setting device, and the hot water and the bypass water are adjusted. With By adjusting the mixing ratio in advance, it is intended to perform predictive control of the tapping temperature when tapping is restarted. With this configuration, the control of only the valve shaft movement amount of the composite valve causes a “temperature jump phenomenon”. And an overflow can be prevented.

The composite valve used in the hot water supply system according to the eighth aspect of the present invention is a composite valve used for mixing hot and cold water in the hot water supply system, and is provided with a valve housing and a water supply formed inside the valve housing. A valve chamber communicating with a water supply port to be supplied, a water supply port to be supplied with hot water, and a water discharge port from which a mixed hot water mixed with hot water is discharged, and a rotatable valve shaft inserted into a valve housing. A valve body formed with a mixing chamber rotatably fitted in the valve chamber and rotatably rotated by the valve shaft and open to the inside of the tap hole, and a water inlet formed through the outer wall of the valve body to the mixing chamber. And a hot water inlet penetrating from the outer wall of the valve body to the mixing chamber at a position shifted in the rotation axis direction of the valve body and the rotation direction of the valve body with respect to the position of the water inlet,
a. When the valve shaft is at the water guide angle position, the hot water inlet is closed by the valve chamber wall, the water inlet overlaps with the water inlet, and b.
When the valve shaft is at the mixing ratio adjusting angle position, the hot water inlet partially overlaps with the hot water inlet, and the water inlet partially overlaps with the hot water outlet; c. When the valve shaft is in the flow control angle position, the hot water inlet partially overlaps with the spout, the water inlet is closed by the valve chamber wall, or the hot water inlet partially overlaps with the hot spout. The water inlet partially overlaps with the water inlet, and the ratio of the area where the water inlet and the hot water inlet and the area where the water inlet and the water inlet overlap is substantially constant; d. When the valve shaft is at the closing angle position, the hot water inlet is closed by the valve chamber wall, and the water inlet is closed by the valve chamber wall. With this configuration,

When the valve shaft is at the water feed angle position, the hot water valve is closed and the water valve is opened, so that water flows from the water feed port to the hot water outlet through the mixing chamber.

When the valve shaft is at the mixing ratio adjusting angle position, the ratio of the opening degree (opening area) between the hot water valve and the water valve changes with the rotation angle of the valve shaft. The ratio of the amount of water flowing to the tap through the tap and the amount of water flowing from the feed port to the tap through the mixing chamber is adjusted.

When the valve shaft is in the flow rate adjusting angle position, the opening degree (opening area) of the hot water valve changes with the rotation angle of the valve shaft, and thus the amount of water flowing from the hot water inlet to the hot water outlet through the mixing chamber. Is adjusted, the water valve is closed, or is opened so that the ratio of the opening degree and the opening degree of the hot water valve is constant, so the water from the water inlet is stopped, Alternatively, water flows from the water inlet to the tap through the mixing chamber at a substantially constant ratio to the amount of hot water flowing from the tap to the tap through the mixing chamber.

When the valve shaft is at the closing angle position, the water valve and the hot water valve are closed, so that both the hot water from the hot water inlet and the water from the hot water inlet are shut off and the water is stopped.

As shown in the above items (1) to (4), only water is supplied from the water inlet to the tap, the flow rate of the hot water flowing from the tap to the tap is controlled, and the hot water flowing from the tap to the tap and discharged from the tap. It is possible to adjust the mixing ratio with the water flowing to the gate by rotating one valve shaft. It has the action of:

The compound valve used in the hot water supply system according to the ninth aspect of the present invention is a compound valve used for mixing hot and cold water in the hot water supply system, and a hot water supply port to which hot water is supplied and water to be supplied. A valve housing having a water inlet, and a tap for discharging mixed hot water mixed with hot water, a mixing chamber formed inside the valve housing and communicating with the tap and the water inlet; and inside the valve housing. A hot water valve chamber formed in the valve housing and communicating with the hot water outlet and the mixing chamber, a valve shaft inserted into the valve housing, inserted through the hot water valve chamber and the mixing chamber and reciprocally movable in the axial direction, and loosely inserted into the valve shaft. A water valve element that can reciprocate in the mixing chamber in the axial direction of the valve shaft, a water valve seat that is disposed between the mixing chamber and the water introduction port, and that constitutes a water valve together with the water valve element; A spring that is loosely inserted into the shaft and urges the water valve body in the direction of the water valve seat, and a stopper that is fixed to the valve shaft and prevents the water valve body from coming off the valve shaft. A hot water valve element mounted on the valve shaft and capable of reciprocating in the axial direction of the valve axis in the hot water valve chamber, and a first hot water valve is disposed between the hot water inlet and the hot water valve chamber together with the hot water valve element. A first hot-water valve seat, and a second hot-water valve seat disposed between the hot-water valve chamber and the mixing chamber to form a second hot-water valve together with the hot-water valve element; a. When the valve shaft is in the water-guiding position, the hot water valve body is closely fitted to the first hot water valve seat, the first hot water valve is closed, and the water valve body is separated from the water valve seat and the water valve is closed. Is opened, b. When the valve shaft is in the mixing ratio adjusting position, the hot water valve body is located between the first hot water valve seat and the second hot water valve seat, and the first hot water valve and the second hot water valve are open. The valve for water is released from the water valve seat, the water valve is opened, and c. When the valve shaft is in the flow rate adjusting position, the hot water valve element is located between the first hot water valve seat and the second hot water valve seat,
The hot water valve and the second hot water valve are opened, the water valve body is closely fitted to the water valve seat and the water valve is closed, d. When the valve shaft is in the closed position, the hot water valve body is closely fitted to the second hot water valve seat, the second hot water valve is closed, and the water valve body is closely fitted to the water valve seat. The valve is assumed to be closed, and by this configuration,

When the valve shaft is at the water guiding position,
Since the first hot water valve is closed and the water valve is open,
Water flows from the water inlet to the tap through the water valve chamber and the mixing chamber.

In the position where the mixture ratio is adjusted,
Since the ratio of the degree of opening between the first hot water valve and the water valve changes with the displacement of the valve shaft, the ratio of the amount of water flowing from the hot water outlet to the hot water outlet and the amount of water flowing from the hot water inlet to the hot water outlet is adjusted.

When the valve shaft is at the flow rate adjusting position, the water valve is closed, and the opening degree of the second hot water valve changes with the displacement of the valve shaft. Is adjusted.

When the valve shaft is in the closed position,
Since the water valve and the second hot water valve are closed, both the hot water from the hot water inlet and the water from the hot water inlet are shut off and the water is stopped.

As described above, water is supplied only from the water inlet to the tap, the flow rate of the hot water flowing from the tap to the tap is controlled, and the hot water flowing from the tap to the tap and discharged from the tap. It is possible to adjust the mixing ratio with the water flowing to the gate by displacing one valve shaft in the axial direction. It has the action of:

[0063] Composite valve for use in hot water supply system according to claim 10 of the present invention is a composite valve of claim 9, the valve housing, always bypass pipe for communicating the water guide openings and guide sprue Metropolitan With this configuration, in addition to the function of claim 9, the water pressure of the water inlet is set to be higher than the water pressure of the water inlet by a constant pressure, so that the water is supplied from the water inlet to the water inlet. The bypass water is always supplied at a constant rate.

[0064] An embodiment of the present invention will now be described with reference to the drawings. (Embodiment 1) FIG. 1 is a hot water supply circuit diagram of a hot water supply system according to Embodiment 1 of the present invention.

In FIG . 1, reference numeral 1 denotes a water supply passage for supplying water to a hot water supply circuit, and 2 denotes a heating passage provided with a heat exchanger 5 which communicates with the water supply passage 1 and is heated by a heating device 4, for heating the supplied water. 2a is a bypass which communicates with the water supply channel 1 and the tapping channel 3 and is disposed in parallel with the heat exchanger 5; It is a hot spring path. In the heating device 4, the amount of heating given to the heat exchanger 5 is adjusted by a capacity adjusting device 6. 7 is water supply channel 1
A flow sensor for detecting a flow rate of water supplied to the water supply passage 1; a flow sensor 9 for detecting a temperature of mixed hot water to be discharged from the water supply passage 3; A water supply temperature sensor 15 is provided at the outlet of the heat exchanger 5 for detecting a water supply temperature. A heat exchange sensor 15 is provided at the outlet of the heat exchanger 5 and detects the temperature of hot water immediately after the heat exchanger 5. Reference numeral 16 denotes a valve body which communicates with the heating path 2, the bypass path 2a, and the tapping path 3 and has a valve body that adjusts the opening degree of the heating path and the opening degree of the bypass path by operating one valve shaft to adjust the flow rate. Close the bypass in the valve shaft travel range, adjust the opening of the heating path, and adjust the mixing ratio.Adjust the ratio between the opening of the bypass path and the opening of the heating path in the valve travel range. By performing this, a compound having a mixing ratio adjusting function of adjusting a mixing ratio for mixing hot water and bypass water passing through the heating path and a flow rate adjusting function of shutting off bypass water and adjusting the flow rate of hot water passing through the heating path are combined. It is a valve. Reference numeral 11 denotes a temperature setter for setting a target temperature of hot water to be requested. Reference numeral 12 denotes a supply water flow rate detected by the flow rate sensor 7, a supply water temperature detected by the supply water temperature sensor 10, a tap water temperature detected by the discharge water temperature sensor 9, and heat. Intersection sensor 1
Hot water temperature in heat exchanger detected by 5 and temperature setting device 1
Capacity adjusting device 6 based on the target temperature Ts set to 1
And a controller that controls the composite valve 16 to control the tapping temperature.

Next, it will be described with reference to the drawings composite valve in the first embodiment to be used in the hot water supply system.

FIG . 2A is a sectional view of a main part of a composite valve used in the hot water supply system according to the first embodiment, and FIG.
FIG. 3A is a cross-sectional end view of the composite valve used in the hot water supply system according to the first embodiment, cut along the A-side of FIG.

In FIG . 2, reference numeral 29 denotes a hot water outlet 26 for feeding hot water (hereinafter referred to as "hot water") from the heating path 2 to the side wall.
a and a water inlet 27a for guiding the bypass water are formed at an angle of about 90 degrees, and a valve housing 29a of the composite valve 16 is provided. 29a is a mounting flange for mounting a valve motor on the valve housing 29;
Is a water supply pipe connected to the water supply path 1, 2 ′ is a water discharge pipe connected to the water supply end of the heating path 2, 23 is a valve element rotatably fitted to a valve housing 29, and 23 a is formed above the valve element 23. A valve shaft 24 for rotating the valve body is provided. A mixing chamber 24 is formed in the valve body 23 in a substantially cylindrical hollow shape and mixes hot water and bypass water.
a 'is a bypass pipe having one end communicating with a water supply pipe 1' and a water discharge pipe 2 'to form a bypass passage 2a for guiding bypass water from the water supply pipe 1' to the mixing chamber 23; A hot water inlet 27 for introducing heated water into the mixing chamber 24 is provided in the side wall of the valve body 23 and a bypass pipe 2a '.
3 ′ is a tapping channel 3 formed at the lower part of the valve housing 29 for guiding the bypass water supplied from the tank to the mixing chamber 24.
A tapping pipe connected to the hot end of the tapping pipe, 28 is a tapping port opened at the lower part of the mixing chamber 24 and communicated with the tapping pipe 3 ′, and 30 is a junction between the water supply pipe 1 ′, the tapping pipe 2 ′ and the bypass pipe 2 a ′. It is a feed water temperature sensor mounting port for mounting a feed water temperature sensor.

The valve body 23 is driven by a valve motor (not shown) mounted on the valve shaft 23a. The controller 12 controls the valve shaft rotation angle (hereinafter, referred to as “valve shaft rotation angle”) θ by controlling the valve motor.

FIG . 3 is a schematic view of the operation of the valve element of the composite valve used in the hot water supply system of the first embodiment. FIG . 4A is a diagram of the valve of the composite valve used in the hot water supply system of the first embodiment. FIG. 4B is a graph showing a change characteristic of the mixing ratio with respect to the shaft rotation angle, and FIG.
FIG. 4 is a characteristic diagram of a change in tapping flow rate with respect to a valve shaft rotation angle of a composite valve used in the hot water supply system according to Embodiment 1.

In FIGS. 3 and 4, A is a water shutoff state in which the hot water and the bypass water are stopped, B is a flow rate adjustment range in which the bypass water is stopped and the flow rate of the hot water is adjusted, and C is a flow control range in which the hot water and the bypass water are stopped. A mixing ratio adjustment range for adjusting the mixing ratio with the hot water, D represents a water supply state in which the hot water is stopped and only the bypass water is supplied. FIG. 3 schematically shows the positional relationship between the hot water inlet 26a and the hot water inlet 26 and the water inlet 27a and the water inlet 27 corresponding to the states A to D. Sh (θ) is the valve shaft rotation angle θ
, The opening area of the heating path 2 opening to the mixing chamber 24 (the area where the hot water inlet 26a and the hot water inlet 26 overlap), Sb
(θ) represents the opening area of the bypass passage 2a that opens into the mixing chamber 24 with respect to the valve shaft rotation angle θ (the area where the water introduction port 27a and the water inlet 27 overlap).

In the mixing ratio adjustment range C, the mixing ratio Rh of the hot water is, in principle, assuming that the water is incompressible in the hot water supply circuit: Rh = Sh (θ) / (Sh (θ) + Sb (θ)), and the mixing ratio Rh of the hot water is substantially determined by the area ratio between Sh (θ) and Sb (θ).

[0073] In addition, the hot water flow rate Q at this time is Sh (θ) + Sb
It is substantially proportional to (θ). Hot water flow rate Q in flow rate adjustment range B
Is substantially proportional to Sh (θ). Therefore, in the composite valve, the flow characteristics as shown in FIG. 4 are adjusted by adjusting the opening areas Sh (θ) and Sb (θ) of the heating path 2 and the bypass path 2a at each valve shaft rotation angle θ. Is possible. However, the area ratio needs to be determined experimentally because water is actually a compressive viscous fluid and also has an effect of, for example, the resistance of a pipe to water transmission.

[0074] Hereinafter, will be described with reference to the drawings relationship between the flow rate of the valve shaft rotation angle θ and the heating water and the bypass water in each state of A~D in the present embodiment. (1) In the water stopping state A (θ0 ≦ θ ≦ θ1), the opening area Sh of the heating path 2 and the opening area Sb of the bypass path 2a are both 0, and both the hot water and the bypass water are stopped. is there. (2a) In the flow rate adjustment range B (θ1 ≦ θ ≦ θ3), when the valve shaft rotation angle θ is in the range of θ1 ≦ θ ≦ θ2, the opening area Sb
Is 0, and the opening area Sh increases as the valve shaft rotation angle θ increases (see FIG. 3). As a result, the flow rate of the heating water increases with an increase in the valve shaft rotation angle θ, and the amount of hot water Q can be controlled by the valve shaft rotation angle. (2b) When the valve shaft rotation angle θ is in the range of θ2 ≦ θ ≦ θ3, the opening area Sb is 0, the opening area Sh is substantially constant in the maximum state, and the tapping amount Q is also substantially constant. (3) In the mixing ratio adjustment range C (θ3 ≦ θ ≦ θ4), the opening area Sb increases as the valve shaft rotation angle θ increases, and
The opening area Sh decreases as the valve shaft rotation angle θ increases.
Thus, the mixing ratio Rh of the hot water and the bypass water changes according to the change in the valve shaft rotation angle θ, and the mixing ratio Rh can be controlled by controlling the valve shaft rotation angle θ. (4) In the water conveyance state D (θ4 ≦ θ ≦ θ5), the opening area Sh
Is 0, and the opening area Sb is substantially constant. Thereby, it is possible to directly conduct water from the water supply channel 1 to the hot water channel 3 through the bypass channel with the heating channel shut off.

In the hot water supply system of the present embodiment configured as described above, a control method thereof will be described below.

[0076] (i) in a steady manner tapped to that state (steady pouring conditions), the controller 12 is a valve shaft rotation angle θ1 ≦ θ ≦ θ3 in flow rate control range B (FIG. 4 the theta valve shaft rotation angle Range). At this time, if the supply water flow rate detected by the flow rate sensor 7 (= water supply flow rate Q) is smaller than the maximum supply flow rate limit for the supply water temperature Tc detected by the supply water temperature sensor 10, the control device 12 controls the valve motor to operate. In the state where the opening area Sh is maximum (in FIG. 4,
(the range of θ2 ≦ θ ≦ θ3), and the tapping temperature is controlled by adjusting the amount of heat supplied to the heat exchanger by the capacity adjusting device 6. The feedwater flow rate detected by the flow rate sensor 7 is equal to the feedwater temperature T detected by the feedwater temperature sensor 10.
If the maximum tapping flow rate limit for c is exceeded, the amount of heat supplied to the heat exchanger 5 is fixed to the maximum by the capacity adjusting device 6, and the valve shaft rotation angle θ is adjusted by the valve motor to the flow rate adjustment range B (θ
The tapping temperature is controlled by adjusting the tapping flow rate Q by adjusting the opening area Sh in the range of 1 ≦ θ ≦ θ2). By performing such control, overflow is prevented, and the minimum value of the tapping flow rate at which the tapping flow rate starts to be adjusted according to the maximum tapping flow rate limit with respect to the target temperature can be changed. It is possible to make full use of the capabilities of the device.

[0077] (ii) the feed water flow detected by the flow sensor 7 stops tapping becomes 0, the hot water temperature in the heating path is raised for some time after the pouring is stopped by boiling the rear, heat is subsequently heat exchanger By being discharged into the environment, the temperature of the hot water in the heating path 2 gradually decreases. At this time, the control device 12 calculates the hot water temperature Th detected by the heat exchange sensor 15 and the hot water temperature Tc0 detected by the hot water temperature sensor 10 before stopping hot water supply.
The mixing ratio of the hot water and the bypass water to the set target temperature Ts is predicted and determined, and the valve shaft rotation angle θ is adjusted by the valve motor in the mixing ratio adjustment range C (θ3 ≦ θ ≦ θ4).
By performing such control, it is possible to prevent hot water from being discharged due to the “temperature jump phenomenon” when the tapping is restarted.

[0078] resumes (iii) hot water, hot water was retained in the heating passage 4 by the water feed is substantially replaced, the amount of heat supplied from the heat exchanger is substantially stable, the hot water temperature Tm by the hot water temperature sensor is stabilized Then, the control device 12 rotates the valve shaft rotation angle θ to the flow rate adjustment range B by the valve motor, and shifts to the control in the steady tapping state.

[0079] (iv) In addition, when passing the water to the hot water passage 3 from the water supply passage 1 in a state of stopping the heating device 4, the control unit 1
2 is a state in which the valve shaft rotation angle θ is controlled by a valve motor in a water guiding state D (θ4 ≦
θ ≦ θ5). By performing such control, it is possible to directly conduct water from the water supply channel 1 to the tapping channel 3 without passing low-temperature water through the heat exchanger 5, and dew condensation occurs inside the heat exchanger 5, and soot clogging occurs. Or low-temperature corrosion can be prevented.

As described above, according to the present embodiment, the water supply channel 1 for supplying water, the heat exchanger 5 heated by the heating device 4, the communication with the water supply channel 1, and the passage of the heat exchanger 5 Heating channel 2 for water supply and bypass channel 2a diverted from water supply channel 1
A hot water path 3 for feeding a mixed hot water in which hot water from the heating path 2 and water from the bypass path 2a are mixed to a hot water outlet;
And a compound valve 16 having a valve body communicating with the bypass passage 2a and the tapping passage 3 to adjust the opening degree of the heating passage 2 and the opening degree of the bypass passage 2a by operating one valve shaft. The valve 16 has a valve shaft movement amount range for adjusting the flow rate, a valve shaft movement amount range for performing the mixing ratio adjustment, and a valve shaft movement amount range for performing the water introduction. In the range, the bypass path 2a is closed and the opening degree of the heating path 2 is adjusted,
Bypass path 2 in the range of valve shaft movement for adjusting the mixing ratio
By controlling the ratio of the opening degree of the heating path 2 to the opening degree of the heating path 2 and closing the heating path 2 and opening only the bypass path 2a in the range of the valve shaft movement amount for conducting water, the valve is controlled in the flow rate adjustment range. By operating the shaft, the flow rate of the hot water can be adjusted. By operating the valve shaft in the mixing ratio adjustment range, the mixing ratio between the bypass water and the hot water can be adjusted. By manipulating the amount of movement of one valve shaft, both the flow rate adjustment and the mixing ratio adjustment can be performed. When the heater is stopped and the supply water is directly supplied to the tapping path, the heating path can be cut off and the supply of water can be conducted through the bypass path, which has an effect of preventing dew condensation in the heat exchanger.

[0081] (Embodiment 2) FIG. 5 (a) variation characteristic view of the mixing ratio relative to the valve shaft rotation angle of the composite valve used in the second embodiment of the hot water supply system of the present invention, FIG. 5 (b) FIG. 6 is a characteristic diagram of a change in tap water flow rate with respect to a valve shaft rotation angle of a composite valve used in the hot water supply system according to the second embodiment. FIG. is there.

In the present embodiment, the configuration of the composite valve other than the hot water supply circuit and the water inlet 27 is the same as that of the first embodiment, and the description is omitted. In the present embodiment, the notch 27b is formed in the valve body 23 of the composite valve 16 so that the valve shaft rotation angle θ is mixed at a constant rate with the heating water in the flow rate adjustment range. It is characterized by having been done.

[0083] Hereinafter, will be described with reference to the drawings relationship between the flow rate of the valve shaft rotation angle θ and the heating water and the bypass water in each state of A~D in the present embodiment.

[0084] In (1) water stop state A (θ0 ≦ θ ≦ θ1) ,
The opening area Sh of the heating path 2 and the opening area Sb of the bypass path 2a are both 0, and both the hot water and the bypass water are in a stopped state.

[0085] In (2a) flow adjustment range B, together with the valve shaft rotation angle theta is in the range of θ1 ≦ θ ≦ θ2, the opening area Sh increases with increasing valve shaft rotation angle theta, water inlet 27
The opening area ratio Sh: Sb becomes substantially constant by the notch portion 27b (see FIG. 6) which is formed so as to protrude. This allows
As the amount of hot water Q increases with an increase in the valve shaft rotation angle θ,
The bypass water is mixed with the hot water at a fixed ratio.
Therefore, the amount of hot water can be controlled by controlling the valve shaft rotation angle θ, and since the bypass water is always mixed with the hot water at a substantially constant ratio, the heating device is always kept at a high temperature. It can be retained, preventing condensation in the heat exchanger, especially when the hot water supply system is installed in a humid location. Further, since the supply water is divided into the bypass path and the heating path with respect to the amount of hot water, the flow rate of the hot water passing through the heating path can be reduced. It has the effect of suppressing erosion and corrosion.

At this time, the bypass water is 5% of the hot water.
At least 60%, preferably at least 10% and at most 50%. If the bypass water is 10% or less, the effect of preventing dew condensation in the heat exchanger and the effect of suppressing erosion and corrosion are small. This is because the temperature of the hot water required to obtain the target temperature of the mixed hot water may exceed 100 ° C., and boiling may occur in the heat exchanger.

[0087] In the range of (2b) valve shaft rotation angle theta is θ2 ≦ θ ≦ θ3, the opening area Sb is increased substantially constant or slightly with increasing valve shaft rotation angle theta, the opening area Sh biggest In the state, it is substantially constant, and the amount of hot water Q is also substantially constant or slightly increased at the maximum. At this time, the mixing ratio of the bypass water to the mixed hot water is also substantially constant or slightly increased.

[0088] (3) mixing ratio adjustment range C (θ3 ≦ θ ≦ θ4)
, The opening area Sb increases with an increase in the valve shaft rotation angle θ, and the opening area Sh decreases with an increase in the valve shaft rotation angle θ. Thus, the mixing ratio Rh of the hot water and the bypass water changes according to the change in the valve shaft rotation angle θ, and the mixing ratio Rh can be controlled by controlling the valve shaft rotation angle θ.

[0089] (4) In the water guide state D (θ4 ≦ θ ≦ θ5) ,
The opening area Sh is 0, and the opening area Sb is substantially constant. Thereby, it is possible to directly conduct water from the water supply channel 1 to the hot water channel 3 through the bypass channel with the heating channel shut off.

Further, in the hot water supply system of the present embodiment configured as described above, the control method thereof is as follows.
The description is omitted because it is similar to the first embodiment.

As described above, according to the present embodiment, in addition to the configuration described in the first embodiment, the valve body has a notch for leaking water from the bypass passage at a portion for opening and closing the bypass passage. Since the ratio of the opening degree of the notch to the opening degree of the heating path is substantially constant in the range of the valve shaft movement amount for adjusting the flow rate, in addition to the operation described in the first embodiment, In the adjustment range, the bypass water is mixed with the hot water at a constant rate. At the time of the flow rate control, the supply water is divided into the heating path and the bypass path, so that the flow rate of the hot water is suppressed, and the flow velocity in the pipe (or the valve) of the heat exchanger or the composite valve is suppressed. Even when the target value of the temperature of the mixed hot water discharged from the hot water path is set low, the heat exchanger can always be maintained at a high temperature. Is obtained.

[0092] (Embodiment 3) FIG. 7 is a hot water supply circuit diagram of a hot water system in the third embodiment of the present invention.

In FIG . 7, a water supply path 1, a heating path 2, a bypass path 2a, a tapping path 3, a heating device 4, a heat exchanger 5, a capacity adjusting device 6, a flow rate sensor 7, a tapping temperature sensor 9, and a feed water temperature sensor 10 are shown. The temperature setting device 11 and the heat exchange sensor 15 are the same as those in FIG.

In hot water supply circuit 700 of the present embodiment,
Reference numeral 2b denotes a constant bypass which connects the bypass 2a and the vicinity of the tapping part of the heating path 2. Reference numeral 17 denotes a connection between the bypass 2a, the heating path 2 and the tapping path 3, and the heating path 2 depends on the valve shaft rotation angle. A composite valve having both a mixing ratio adjusting function for adjusting a mixing ratio for mixing hot water and bypass water passing through the heater and a flow rate adjusting function for shutting off bypass water and adjusting the flow rate of hot water passing through the heating path 2; Feed water flow rate detected by the sensor 7, feed water temperature detected by the feed water temperature sensor 10, hot water temperature detected by the hot water temperature sensor 9, hot water temperature immediately after the heat exchanger detected by the heat exchange sensor 15, and a temperature setting device. The control unit controls the capacity adjusting device 6 and the composite valve 17 based on the target temperature Tc set to 11 to control the hot water temperature. The constant bypass path 2b is formed of a thin tube having a smaller cross-sectional area than the cross-sectional area of the heating path 2, and is 5% or more and 60% or less, preferably 1% or less, of the hot water from the heating path 2.
The setting is such that bypass water having a flow rate of 0% or more and 50% or less flows.

Next, it will be described with reference to the drawings composite valve in the third embodiment used in the above hot water supply system.

FIG . 8 is a cross-sectional view of a main part of a composite valve having a constant bypass pipe used in the hot water supply system according to the third embodiment.

In FIG . 8, reference numeral 40 denotes a valve housing of the composite valve 17,
Reference numeral 1 'denotes a water supply pipe disposed on the lower side wall of the valve housing 40 and connected to the water supply passage 1. Reference numeral 2' denotes a water discharge pipe disposed at the lower end of the valve housing 40 and connected to the water supply pipe 1 'and connected to the water supply end of the heating path 2. 3 ′ is a valve housing 40
A hot water pipe disposed on a side wall near the center of the valve and connected to a hot end of hot water path 3; a hot water pipe disposed on a side wall near an upper portion of valve housing 40 and connected to a hot end of hot path 2; Reference numeral 2b 'denotes a constant bypass pipe, which is a thin pipe formed in the valve housing 40 communicating with the water supply pipe 1' and the hot water pipe 2 ", and 46a denotes a connection point between the hot water pipe 2" and the constant bypass pipe 2b '. Formed and always bypass pipe 2
The upper mixing chamber mixes the always-bypass water flowing from b ′ and the hot water flowing from the hot water pipe 2 ″.
In 6a, the hot water and the bypass water are always mixed to produce a mixed hot water (hereinafter, referred to as "initial mixed hot water"). A lower mixing chamber 46b is formed below the upper mixing chamber 46a and communicates with the tapping pipe 3 'to mix the initial mixed hot water and the bypass water.
Reference numeral 6c denotes a water diversion chamber which is disposed below the lower mixing chamber and communicates with the water supply pipe 1 ', the water discharge pipe 2' and the bypass pipe 2b 'at all times.
6d is a hot water valve chamber formed between the upper mixing chamber 46a and the lower mixing chamber 46b, and 46e is a water valve chamber formed between the lower mixing chamber 46b and the water distribution chamber 46c. Each of the valve chambers is provided in the valve housing 40 from above in the upper mixing chamber 46a and the hot-water valve chamber 4.
6d, lower mixing chamber 46b, water valve chamber 46e, water distribution chamber 46c
Are arranged on one axis. 47a is the upper mixing chamber 4
A first hot water valve seat disposed between 6a and the hot water valve chamber 46d,
47b is a second hot water valve seat disposed between the hot water valve chamber 46d and the lower mixing chamber 46b, and 47c is a water valve seat disposed between the lower mixing chamber 46b and the water valve chamber 46e. is there. The upper mixing chamber 46a and the hot water valve chamber 46d communicate with each other through a circular opening through which a valve body provided in the center of the first hot water valve seat 47a is inserted. The hot-water valve chamber 46d and the lower mixing chamber 46b communicate with each other through an upwardly tapered circular opening through which a valve body formed in the center of the second hot-water valve seat 47b is inserted. The lower mixing chamber 46b and the water valve chamber 46e communicate with each other through an upwardly tapered circular opening through which a valve body provided at the center of the water valve seat 47c is inserted. The water valve chamber 46e and the water distribution chamber 46c communicate with each other by a bypass pipe 2a '. The central axis of the circular opening of each valve seat is coaxial. Reference numeral 49 denotes a valve cover that fits into a valve mounting port 40a provided through the upper part of the valve housing 40. The central axis of the valve lid 49 is also coaxial with the center of the circular opening of each valve seat. Reference numeral 50 is vertically slidably fitted in a valve shaft mounting port 49a formed on the central axis of the valve lid 49, and an upper end portion protrudes from the valve shaft mounting port 49a.
The lower portion is inserted through the circular opening of the first hot water valve seat 47a, the circular opening of the second hot water valve seat 47b, and the circular opening of the water valve seat 47c, and the lower end reaches the bottom in the water valve chamber 46b. This is a cylindrical valve shaft that extends to the outside. At the lower end of the valve shaft 50, a columnar projection 50b which is coaxially reduced in a step shape is formed, and its tip is located on the central axis from the bottom of the water valve chamber 46e to the ceiling of the water distribution chamber 46c. It is slidably fitted in the guide hole 49b penetrated. Reference numeral 51 denotes a hot-water valve element which is mounted and fixed in the middle of the valve shaft 50 and is movable up and down in the hot-water valve chamber 46d in accordance with the movement of the valve shaft 50. The hot water valve element 51 is vertically displaced with the vertical movement of the valve shaft 50. When the valve shaft 50 is displaced to the highest position, the first hot water valve seat 47a is closed from below and the upper mixing chamber 4 is closed.
When the valve shaft 50 is displaced to the lowermost position, the second hot water valve seat 47b is closed from above and the flow between the hot water valve chamber 46d and the lower mixing chamber 46b is shut off. Shut off water. Reference numeral 55 denotes a valve shaft 50 near the bottom in the lower mixing chamber 46b.
The water valve body is slidably mounted in the lower mixing chamber 46b and moves up and down in the lower mixing chamber 46b as the valve shaft 50 moves up and down. 53 is a spring fitted between the hot water valve element 51 and the water valve element 55 of the valve shaft 50 to urge the water valve element 55 downward, and 52 is a spring below the water valve element 55 and the valve shaft 50. And a stopper for preventing the water valve body 55 from being pulled out of the valve shaft 50. The water valve element 55 is displaced up and down with the vertical movement of the valve shaft 50, and when the valve shaft 50 is displaced to the middle position, the water valve element 55 is displaced.
Closes the water valve seat 47c from above, shuts off water flow between the water valve chamber 46e and the lower mixing chamber 46b, and when the valve shaft 50 is further displaced downward, the water valve body 55 is moved to the water valve seat 47c. When pressed, the valve shaft 50 slides while compressing the spring 53. 5
Reference numeral 6 denotes a motor that drives the valve shaft 50 in the vertical direction.

[0098] The composite valve of a hot water supply system of this embodiment configured as described above will be described the operation of the valve body.

[0099] (1) valve shaft 50 (hereinafter referred to as "water guide state".) State that is displaced to the highest in hot water valve element 51
Closes the opening of the first hot water valve seat 47a, so that the upper mixing chamber 46a and the hot water valve chamber 46d are blocked from flowing water. At this time, the water valve body 55 is located near the center of the lower mixing chamber 46b. In this state, only the bypass water is
From 6c, the water flows into the lower mixing chamber 46b through the bypass pipe 2a 'and the water valve chamber 46e. Therefore, the water flowing in from the water supply pipe 1 'flows out from the tapping pipe 3'.

[0100] (2) Next, the valve shaft 50 is displaced from the top downwards, the hot water valve element 51 is located intermediate the first hot water valve seat 47a and the second hot water valve seat 47b First hot water valve seat 47a
Is opened, and the water valve element 55 is connected to the water valve seat 4.
In the range of the valve shaft displacement amount in which the opening of 7c is not closed (hereinafter referred to as the “mixing ratio adjustment range”), the hot water from the hot water pipe 2 ″ and the bypass pipe 2 are always provided in the upper mixing chamber 46a.
b 'always flows in and is mixed with the bypass water, and becomes the initial mixed hot water, passes through the hot-water valve chamber 46d, and flows into the lower mixing chamber 46b.
Flows into. At this time, since the opening of the water valve seat 47c is also opened, the bypass water also flows into the lower mixing chamber 46b through the bypass pipe 2a 'and the water valve chamber 46e. Accordingly, the initial mixed hot water and the bypass water flow into the lower mixing chamber 46b, and the mixed hot water (hot water in which the initial mixed hot water and the bypass water are mixed) flows out from the tapping pipe 3 '. At this time, as the width of the gap between the hot water valve element 51 and the first hot water valve seat 47a (hereinafter referred to as the "throttle width") changes with the displacement of the valve shaft 50, the water transfer resistance changes and the initial mixed hot water changes. Of the water valve 55 and the water valve seat 47 together with the displacement of the valve shaft 50.
By changing the width of the restriction with c, the water conveyance resistance changes and the flow rate of the bypass water changes. The throttle width between the hot water valve element 51 and the first hot water valve seat 47a increases in proportion to the downward displacement of the valve shaft 50, and conversely, the throttle width between the water valve element 55 and the water valve seat 47c. Becomes smaller in inverse proportion to the downward displacement of the valve shaft 50, so that by displacing the valve shaft 50, the mixing ratio Rh of the initial mixed hot water and the bypass water can be adjusted.

[0102] (3) Further, the valve shaft 50 is displaced to medium, the hot water valve element 51 is located intermediate the first hot water valve seat 47a and the second hot water valve seat 47b, When the water valve element 55 closes the opening of the water valve seat 47c, the first hot water valve seat 47a and the second hot water valve seat 47b are open, and the water valve seat 47c is closed. Since only the closed water is closed, the bypass water is shut off, and only the initial mixed hot water flows from the upper mixing chamber 46a through the hot water valve chamber 46d into the lower mixing chamber 46b, and the initial mixed hot water flows out of the tapping pipe 3 '. .

[0102] (4) Further, the valve shaft 50 is displaced toward the middle downward, cold water valve element 55 has closed the cold water valve seat 47c, the water valve body 55 is cold water valve In the valve shaft displacement amount range (hereinafter, referred to as “flow rate adjustment range”) in which the water valve element 55 presses the spring 53 and is compressed because the water valve element 55 is pressed by the seat 47 c, the hot water is used in accordance with the displacement of the valve shaft 50. Valve 5
Numeral 1 is displaced between the first hot water valve seat 47a and the second hot water valve seat 47b, and the constriction width between the hot water valve element 51 and the second hot water valve seat 47b changes the water conveyance resistance. Then, the flow rate of the initial mixed hot water changes. At this time, the bypass water is shut off by the water valve body 55. Accordingly, the flow rate of the initial mixed hot water flowing out of the tapping pipe 3 ′ can be controlled by the displacement of the hot water valve body 51.

[0103] In the state (5) valve shaft is displaced to the lowest (hereinafter referred to as "water stop status".), Hot water valve element 51 closes the opening portion of the second hot water valve seat 47b, for water Since the valve body 55 closes the opening of the water valve seat 47c, water flow is shut off.

FIG . 9A is a characteristic diagram of the change of the mixing ratio with respect to the displacement of the valve shaft, and FIG. 9B is a characteristic diagram of the change of the tapping flow rate with respect to the displacement of the valve shaft.

In FIG . 9, when the valve shaft displacement x is x0, the water is introduced, the hot water is shut off, and only the bypass water flows out of the tapping pipe 3 '. When the valve shaft displacement x is within the mixing ratio adjustment range (x0 ≦ x ≦ x1), the flow rate Qh of the hot water increases as the displacement x increases, and the flow rate Qb of the bypass water increases.
Decreases to a certain value. When the valve shaft displacement x is x1, the flow rate Qh of the hot water is substantially constant at the maximum. When the valve shaft displacement x is within the flow rate adjustment range (x1 ≦ x ≦ x3), Q
h: Qb keeps a substantially constant value, and the tapping amount Q (= Qh + Qb) decreases as the valve shaft displacement x increases. The valve shaft displacement x is x
In the water stop state of 3, the hot water and the bypass water are shut off and the tapping stops.

In the flow rate control range, the bypass water is 5% to 60% of the hot water, preferably 10% to 50%. If the bypass water is 10% or less,
When the target temperature is set to the maximum set temperature if the dew condensation preventing action in the heat exchanger and the erosion and corrosion suppressing action are small and the bypass water is 50% or more, in order to obtain the mixed hot water temperature of the target temperature. Required hot water temperature is 10
This is because the temperature may exceed 0 ° C. and boiling may occur in the heat exchanger.

In the hot water supply system according to the present embodiment configured as described above, a control method thereof will be described below.

[0108] (i) in a steady manner tapped to that state (steady pouring conditions), the control unit 12 the valve shaft of x1 ≦ x ≦ x3 in flow rate control range B (FIG. 9 the displacement amount x of the valve shaft 50 Displacement range). At this time, the supply water flow rate (= water supply flow rate Q) detected by the flow rate sensor 7 is equal to the supply water temperature sensor 1.
0 is smaller than the maximum tapping flow rate limit for the supply water temperature Tc detected by the control unit 12, the controller 12 controls the valve motor 5.
6, the valve shaft displacement is fixed to the state where the flow rate Q is maximum (in FIG. 9, the area of x1 ≦ x ≦ x2),
The tapping temperature is controlled by adjusting the amount of heat supplied to the heat exchanger. When the feed water flow rate detected by the flow rate sensor 7 exceeds the maximum tap water flow rate limit for the feed water temperature Tc detected by the feed water temperature sensor 10,
The amount of heat to be supplied to the heat exchanger 5 is fixed to the maximum by the capacity adjusting device 6, and the valve shaft displacement x is adjusted by the valve motor 56 in the flow rate adjusting range (x2 ≦ x ≦ x3), so that the tap water flow rate is increased. The tapping temperature is controlled by adjusting Q. By performing such control, overflow is prevented, and the minimum value of the tapping flow rate at which the tapping flow rate starts to be adjusted according to the maximum tapping flow rate limit with respect to the target temperature can be changed. It is possible to make full use of the capabilities of the device.

[0109] (ii) the feed water flow detected by the flow sensor 7 stops tapping becomes 0, the hot water temperature in the heating passage 2 rises for some time after the pouring is stopped by boiling the rear, the subsequent heat exchanger 5 As the heat is released to the outside, the temperature of the hot water in the heating path gradually decreases. At this time, the control device 12
From the hot water temperature Th detected by the heat exchange sensor 15 and the feed water temperature Tc0 detected by the feed water temperature sensor 10 before the stop of hot water supply, a mixture ratio between the hot water and the bypass water with respect to the set target temperature Ts is predicted and determined; The valve shaft displacement x is adjusted by the valve motor 56 in the mixing ratio adjustment range (x0 ≦ x ≦ x1). By performing such control, it is possible to prevent hot water from being discharged due to the “temperature jump phenomenon” when the tapping is restarted.

[0110] The (iii) tapping resumes, hot water staying in the heating path 2 by the water feed is substantially replaced, the amount of heat supplied from the heat exchanger 5 is substantially stable, the hot water temperature Tm detected by the hot water temperature sensor 9 When the value is stabilized, the control device 12 controls the valve shaft displacement x by the valve motor 56 to the flow rate adjustment range (x2 ≦ x ≦
x3), and shifts to control in a steady tapping state.

[0111] (iv) In addition, when passing the water to the hot water passage 3 from the water supply passage 1 in a state of stopping the heating device 4, the control unit 1
2 is a displacement x in a water-conducting state by a valve shaft displacement x by a valve motor 56.
Set to 0. By performing such control, it is possible to directly conduct water from the water supply channel 1 to the tapping channel 3 without passing low-temperature water through the heat exchanger 5, and dew condensation occurs inside the heat exchanger 5, and soot clogging occurs. Or low-temperature corrosion can be prevented.

As described above, according to the present embodiment, in addition to the configuration described in the first embodiment, the bypass passage or the water supply passage communicates with the downstream side of the heat exchanger of the heating passage, and the supply from the heating passage is performed. In addition to the operation described in the first embodiment, the hot water to be heated is provided with a constant bypass which mixes the water from the bypass or the water supply at a flow rate substantially constant to the flow of the hot water. In the range, since the water pressure of the water supply passage is higher than the water pressure of the heating passage, the water is supplied from the water supply passage at a constant rate to the hot water and mixed, so that the heat exchanger is operated even when the set temperature is low. High temperature can always be maintained. At the time of the flow rate control, the supply water is divided into the heating path and the bypass path, so that the flow rate of the hot water is suppressed, and the flow velocity in the pipe (or the valve) of the heat exchanger or the composite valve is suppressed. Even when the target value of the temperature of the mixed hot water discharged from the hot water path is set low, the heat exchanger can always be maintained at a high temperature. Is obtained.

[0113]

As described above, according to the hot water supply system according to the first aspect, the water supply passage for supplying water, the heat exchanger heated by the heating device, the communication between the water supply passage and the heat exchanger. A heating channel for water, a bypass channel diverted from the water supply channel,
Opening of the heating passage by operating one valve shaft that communicates with the heating passage, the bypass passage, and the tapping water passage, and that communicates with the heating passage, the bypass passage, and the tapping water passage. And a compound valve having a valve body for adjusting the degree of opening of the bypass passage and the degree of opening of the bypass passage. The compound valve has a valve shaft movement amount range for adjusting the flow rate and a valve shaft movement amount range for adjusting the mixing ratio. The valve element closes the bypass and adjusts the opening degree of the heating path in the valve shaft movement amount range for performing the flow rate adjustment, and adjusts the opening degree of the bypass passage in the valve shaft movement amount range for performing the mixing ratio adjustment. By adjusting the ratio to the degree of opening of the heating path, the "temperature jump phenomenon" is suppressed, and it is possible to prevent over-flow, and the heating apparatus can be operated in the entire range below the maximum tapping flow rate limit of the heating apparatus. It can be used, the hot water supply circuit is simple, excellent in reliability and maintainability, Hot water circuit is compact, advantageous effect that it is possible to provide a producible hot water system can be obtained at low cost.

[0114] According to the invention of claim 2, the hot water system according to claim 1, the valve body, the heating passage in the valve shaft movement amount range for flow regulation in a portion for opening and closing the bypass passage By providing the notch for leaking water from the bypass so that the ratio of the degree of opening of the notch to the degree of opening is substantially constant, in addition to the effect of claim 1, the heat exchanger and Erosion and corrosion in the composite valve are suppressed, and the heat exchanger is always kept at a high temperature.Therefore, dew condensation in the heat exchanger hardly occurs even in a humid environment, thereby preventing soot clogging and low-temperature corrosion. The advantage is that it is possible to provide a hot water supply system that can be produced at low cost.

[0115] According to the invention of claim 3, the hot water system according to claim 2, notch, in the valve shaft movement amount range for flow rate adjustment, the water to be leaked from the bypass passage flow rate Is 5 times the flow rate of hot water from the heating path.
% And 60% or less, preferably 10% or more and 50% or less. In addition to the effects described in claim 2, a hot water supply system in which boiling in the heat exchanger is prevented is provided. An advantageous effect of being able to provide is obtained.

[0116] According to the invention described in claim 4, a hot water supply system according to claim 1, from the bypass passage or the water supply passage and communicates the downstream side of the heat exchanger of the heating circuit heating circuit 2. In addition to the effect according to claim 1, heat exchange is provided by providing a constant bypass which mixes the supplied hot water with water from a bypass or a water supply at a flow rate substantially constant to the flow rate of the hot water. Erosion and corrosion in the heat exchanger and composite valve are suppressed, and dew condensation in the heat exchanger is less likely to occur even in a high-humidity environment, preventing soot clogging and low-temperature corrosion, and providing a low-cost hot-water supply system Has the advantageous effect of being able to do so.

[0117] According to the invention of claim 5, the hot water system according to claim 4, it is always bypass passage for flow of hot water from the flow of water at all times bypass the heating passage 5 % To 60%, preferably 10% to 5%
When it is 0% or less, in addition to the effect described in claim 4, an advantageous effect that it is possible to provide a hot water supply system in which boiling in the heat exchanger is prevented can be provided.

[0118] According to the invention of claim 6, the hot water system according to any one of claims 1 to 5, combined valve has a valve shaft movement amount range for water conveyance,
The valve body shuts off the heater in addition to the effect according to any one of claims 1 to 5 by closing the heating path and opening only the bypass path in the valve shaft movement amount range for conducting water. When the supply water is directly introduced into the hot water supply channel, since the dew condensation in the heat exchanger hardly occurs, it is possible to provide a hot water supply system in which occurrence of soot clogging and low-temperature corrosion is suppressed. Is obtained.

[0119] According to the control method of the hot-water supply system according to claim 7, a flow rate sensor for detecting the flow rate of water in the water supply passage, a water supply temperature sensor for detecting the water temperature of the water supply passage, immediately after the heat exchanger A heat exchange sensor for detecting the water temperature, a temperature setting device for setting a target value of the temperature of the mixed hot water discharged from the hot water channel, a valve motor for driving a valve shaft of the composite valve, and adjusting a heating amount of the heating device. A capacity adjustment device, and a control device that controls the valve motor and the capacity adjustment device based on the detection values of the flow rate sensor, the feedwater temperature sensor, and the heat exchange sensor and the target value of the temperature set by the temperature setting device. 7. The method for controlling a hot water supply system according to claim 1, wherein in a steady tapping state, the control device adjusts a flow rate by adjusting a valve shaft moving amount of the combined valve and heating by a capacity adjusting device. Out by adjusting the amount In the state where the temperature is controlled and the tapping is stopped, the control device is set by the temperature setting device based on the temperature of the hot water immediately after the heat exchanger detected by the heat exchange sensor and the water temperature of the water supply passage detected by the water supply temperature sensor. Predicting control of tapping temperature when tapping is resumed by adjusting the valve shaft movement amount of the composite valve in accordance with the set temperature target value and pre-adjusting the mixing ratio of hot water and bypass water Accordingly, the advantageous effect that a control method of a hot water supply system that can be realized by a simple hot water supply circuit and a control circuit is provided is obtained.

[0120] Further, according to the multifunction valve to be used for hot water supply system according to claim 8, a composite valve used in the mixing faucet of hot water supply system, and the valve housing, the water is Katachi設inside valve housing A valve chamber communicating with a water supply port to be supplied, a water supply port to which the hot water is supplied, and a discharge port from which a mixed hot water mixed with the hot water is discharged, and a rotatable valve shaft inserted into the valve housing and rotatable. A valve body formed with a mixing chamber rotatably fitted in the valve chamber and rotated by the valve shaft and opened to the inside of the tap hole, and a water flow penetrating from the outer wall of the valve body to the mixing chamber. An inlet, and a hot water inlet penetrating from the outer wall of the valve body to the mixing chamber at a position shifted in the direction of the rotation axis of the valve body and the direction of rotation of the valve body with respect to the position of the water inlet, a. When the valve shaft is at the water guide angle position, the hot water inlet is closed by the valve chamber wall, the water inlet overlaps with the water inlet,
b. When the valve shaft is at the mixing ratio adjusting angle position, the hot water inlet partially overlaps with the hot water inlet, and the water inlet partially overlaps with the hot water outlet; c. When the valve shaft is in the flow control angle position,
The hot water inlet partially overlaps with the hot water inlet, the water inlet is closed by the valve chamber wall, or the hot water inlet partially overlaps with the hot water inlet, and the water inlet partially overlaps with the water inlet, The ratio of the overlapping area between the hot water inlet and the hot water inlet and between the hot water inlet and the water inlet is substantially constant; d. When the valve shaft is in the closed angle position,
The hot water inlet is closed by the wall of the valve chamber, and the water inlet is closed by the wall of the valve chamber, so that when water is to flow into the hot water outlet, the hot water outlet can be closed. It is possible to provide a composite valve capable of performing a flow rate control for preventing the occurrence of a pressure and a mixing ratio control for preventing a “temperature jump phenomenon” by rotating one valve shaft. By this effect, the flow rate control of the hot water supply system can be performed by one valve motor, and the advantageous effect that the control mechanism can be simplified can be obtained.

[0121] Further, according to the multifunction valve to be used for hot water supply system according to claim 9, a composite valve used in the mixing faucet of hot water supply system, an electrically sprue which hot water is supplied, water is supplied A valve housing having a water inlet for discharging mixed hot water mixed with hot water and a water outlet, a mixing chamber formed inside the valve housing and communicating with the water outlet and the water inlet, and a valve housing. A hot water valve chamber formed inside and communicating with the hot water outlet and the mixing chamber, a valve shaft inserted into the valve housing, inserted through the hot water valve chamber and the mixing chamber, and reciprocally movable in the axial direction, A water valve element inserted and reciprocally movable in the axial direction of the valve shaft in the mixing chamber, and a water valve seat disposed between the mixing chamber and the water introduction port to constitute a water valve together with the water valve element, A spring that is loosely inserted into the valve shaft and urges the water valve body in the direction of the water valve seat, and a stopper that is fixed to the valve shaft and prevents the water valve body from coming off the valve shaft. A hot water valve element attached to the valve shaft and capable of reciprocating in the axial direction of the valve shaft in the hot water valve chamber; and a first hot water valve together with the hot water valve element disposed between the hot water outlet and the hot water valve chamber. And a second hot water valve seat disposed between the hot water valve chamber and the mixing chamber to form a second hot water valve together with the hot water valve element, a. When the valve shaft is in the water-guiding position, the hot water valve body is closely fitted to the first hot water valve seat, the first hot water valve is closed, and the water valve body is separated from the water valve seat and the water valve is closed. Is opened, b. When the valve shaft is in the mixing ratio adjusting position, the hot water valve body is located between the first hot water valve seat and the second hot water valve seat, and the first hot water valve and the second hot water valve are open. The valve for water is released from the water valve seat, the water valve is opened, and c. When the valve shaft is in the flow control position, the hot water valve body is located between the first hot water valve seat and the second hot water valve seat, and the first hot water valve and the second hot water valve are opened. The water valve body is closely fitted to the water valve seat, the water valve is closed, and d. When the valve shaft is in the closed position, the hot water valve body is closely fitted to the second hot water valve seat, the second hot water valve is closed, and the water valve body is closely fitted to the water valve seat. Since the valve is closed, it is possible to close the hot water outlet if you want to flow water to the hot water outlet, and to control the flow rate to prevent the hot water supply system from overflowing and prevent the "temperature splash phenomenon" To provide a composite valve capable of performing the mixing ratio control for controlling the hot water supply system by the rotation of one valve shaft. And the advantageous effect that the control mechanism can be simplified can be obtained.

[0122] According to the invention described in claim 10,
In the composite valve according to the ninth aspect, the valve housing is formed with a constant bypass pipe that connects the water inlet and the hot water inlet, so that in addition to the effect according to the eighth aspect, the valve is discharged from the outlet. Since the temperature of the mixed hot water is always lowered by the water supplied from the bypass, even when it is necessary to discharge low-temperature hot water, the temperature of the hot water supplied from the hot water supply port can be increased. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a hot water supply circuit diagram of a hot water supply system according to Embodiment 1 of the present invention.

FIG. 2A is a sectional view of a main part of a composite valve used in the hot water supply system according to the first embodiment; FIG.

FIG. 3 is an operation schematic diagram of a valve body of a composite valve used in the hot water supply system according to the first embodiment.

FIG. 4 (a) is a diagram showing a change characteristic of a mixing ratio with respect to a valve shaft rotation angle of a composite valve used in the hot water supply system according to the first embodiment; Diagram of change in tapping flow rate with shaft rotation angle

FIG. 5 (a) is a diagram showing a change characteristic of a mixing ratio with respect to a valve shaft rotation angle of a composite valve used in a hot water supply system according to a second embodiment of the present invention; Characteristics of change of tap water flow rate with respect to valve shaft rotation angle

FIG. 6 is an operation schematic diagram of a valve body of a composite valve used in the hot water supply system according to the second embodiment.

FIG. 7 is a hot water supply circuit diagram of a hot water supply system according to Embodiment 3 of the present invention.

FIG. 8 is a sectional view of a main part of a composite valve having a constant bypass pipe used in the hot water supply system according to the third embodiment;

FIG. 9A is a characteristic diagram showing a change in the mixing ratio with respect to the displacement of the valve shaft. FIG.

FIG. 10 is a hot water supply circuit diagram of a conventional hot water supply system.

FIG. 11 is a hot water supply circuit diagram of a conventional hot water supply system disclosed in Japanese Patent Publication No.

FIG. 12 is a hot water supply circuit diagram of a conventional hot water supply system.

[Description of Signs] 1 water supply path 1 'water supply pipe 2 heating path 2' water discharge pipe 2 "hot water pipe 2a bypass path 2a 'bypass pipe 2b constant bypass path 2b' constant bypass pipe 3 tap water path 3 'tapping pipe 4 heating device Reference Signs List 5 heat exchanger 6 capacity adjusting device 7 flow sensor 8 overflow prevention valve (water governor) 9 tapping water temperature sensor 10 feed water temperature sensor 11 temperature setting device 12 control device 13 water flow control valve 14 mixing valve 15 heat exchange sensor 16, 17 compound Valve 23 Valve body 23a Valve shaft 24 Mixing chamber 26 Hot water inlet 26a Hot water inlet 27 Water inlet 27a Water inlet 27b Notch 28 Hot water outlet 29 Valve housing 29a Mounting flange (flange joint) 30 Water supply temperature sensor mounting port 40 Valve housing 40a Valve mounting port 46a Upper mixing chamber 46b Lower mixing chamber 46c Water distribution chamber 46d Hot water valve chamber 46e Water valve chamber 47a First hot water valve seat 47b Second hot water valve seat 47c Water valve seat 49 Valve lid 49a Valve shaft mounting port 49b Guide hole 50 Valve shaft 50b Cylindrical projection 51 Hot water valve body 52 Stopper 53 Spring 55 Water valve body 56 Valve motor 700 Hot water supply circuit

Claims (10)

[Claims] 1. A water supply passage for supplying water, a heat exchanger heated by a heating device, a heating passage communicating with the water supply passage and passing the heat exchanger, and a bypass diverted from the water supply passage. Path, a tapping path for feeding mixed water in which hot water from the heating path and water from the bypass path are mixed to a tapping port,
A composite valve including a valve body that communicates with the heating path, the bypass path, and the tapping path, and that controls the opening degree of the heating path and the opening degree of the bypass path by operating one valve shaft. The composite valve has a valve shaft movement amount range for performing flow rate adjustment and a valve shaft movement amount range for performing mixing ratio adjustment, and the valve element includes:
In the valve shaft movement amount range for performing the flow rate adjustment, the bypass passage is closed and the opening degree of the heating passage is adjusted, and in the valve shaft movement amount range for performing the mixing ratio adjustment, the opening degree of the bypass passage and the opening amount are controlled. A hot water supply system characterized by adjusting a ratio with a degree of opening of a heating path. 2. A ratio of an opening degree of the notch portion to an opening degree of the heating path is substantially constant in a valve shaft movement amount range in which a flow rate is adjusted in a portion for opening and closing the bypass passage. The hot water supply system according to claim 1, further comprising a notch for allowing water to leak from the bypass passage. 3. The flow rate of water leaking from the bypass passage is 5% or more and 60% or less with respect to the flow rate of hot water from the heating passage in the valve shaft movement amount range for performing the flow rate adjustment. The hot water supply system according to claim 2, wherein the hot water supply system is formed so as to be preferably 10% or more and 50% or less. 4. The hot water supplied from the heating path through the bypass path or the water supply path and the downstream side of the heat exchanger of the heating path at a flow rate substantially constant to the flow rate of the hot water. The hot water supply system according to claim 1, further comprising a constant bypass that mixes the water from the bypass or the water supply. 5. The continuous bypass passage, wherein the flow rate of water in the continuous bypass passage is 5 times the flow rate of hot water from the heating passage.
The hot water supply system according to claim 4, characterized in that it is not less than 10% and not more than 60%, preferably not less than 10% and not more than 50%. 6. The composite valve has a valve shaft movement range for conducting water, and the valve element closes the heating path and opens only the bypass passage in a valve shaft movement range for conducting water. The hot water supply system according to any one of claims 1 to 5, wherein 7. A flow rate sensor for detecting a flow rate of water in the water supply path, a water supply temperature sensor for detecting a water temperature of the water supply path, a heat exchange sensor for detecting a water temperature immediately after the heat exchanger,
A temperature setting device for setting a target value of the temperature of the mixed hot water discharged from the hot water path, a valve motor for driving the valve shaft of the composite valve, and a capacity adjusting device for adjusting a heating amount of the heating device, A control device that controls the valve motor and the capacity adjusting device based on a detection value of the flow rate sensor, the feedwater temperature sensor, and the heat exchange sensor and a target value of the temperature set by the temperature setting device. 7. The method of controlling a hot water supply system according to claim 1, wherein in a steady hot water supply state, the control device adjusts a flow rate and an ability of the composite valve by adjusting a valve shaft movement amount. The hot water temperature is controlled by adjusting the amount of heating by the device, and in a state where hot water is stopped, the control device uses the hot water temperature immediately after the heat exchanger detected by the heat exchange sensor and the feed water temperature sensor. The valve shaft moving amount of the composite valve is adjusted in accordance with the target value of the temperature set by the temperature setting device based on the water temperature of the supplied water supply channel, and the mixing ratio of the hot water and the bypass water is adjusted in advance. A hot water supply system control method for predicting hot water temperature when hot water is restarted. 8. A compound valve used for mixing hot and cold water in a hot water supply system, comprising: a valve housing, a water inlet formed inside the valve housing, to which water is supplied, a water inlet to which hot water is supplied, hot water, and water. A valve chamber communicating with a tapping outlet from which a mixed hot water is discharged, a rotatable valve shaft inserted into the valve housing, and the valve shaft rotatably tightly fitted to the valve chamber. A valve body in which a mixing chamber which is rotated by and opened inside toward the tap hole is formed,
A water inlet penetrating from the valve body outer wall to the mixing chamber,
A hot water inlet penetrating from the outer wall of the valve body to the mixing chamber at a position shifted from the position of the water inlet in the direction of the rotation axis of the valve body and the direction of rotation of the valve body; When the valve shaft is at the water guide angle position, the hot water inlet is closed by the valve chamber wall, the water inlet is overlapped with the water inlet, b. When the valve shaft is at the mixing ratio adjusting angle position, the hot water inlet partially overlaps with the hot water outlet, and the water inlet partially overlaps with the hot water outlet; c. When the valve shaft is in the flow control angle position, the hot water inlet partially overlaps with the hot water inlet, and the hot water inlet is closed by the valve chamber wall, or the hot water inlet is connected to the hot water inlet. The spout partially overlaps with the spout, the water inlet partially overlaps with the spout, and the ratio of the superposed area of the spout and the spout and the spout and the spout is substantially constant. , D. When the valve shaft is at the closing angle position, the hot water inlet is closed by the valve chamber wall, and the water inlet is closed by the valve chamber wall. 9. A composite valve used for mixing hot and cold water in a hot water supply system, wherein a hot water supply port, a water supply port to which water is supplied, and a mixed hot water mixed with hot water are discharged. A tap housing having a tap hole, a mixing chamber formed inside the valve casing and communicating with the tap port and the water feed port, and a mixing chamber formed inside the valve casing with the hot water port and the mixing chamber. A valve chamber communicating with the valve chamber, a valve shaft inserted into the valve housing, inserted through the valve chamber and the mixing chamber, and capable of reciprocating in the axial direction; A water valve element that can reciprocate in the axial direction of a shaft, a water valve seat that is disposed between the mixing chamber and the water introduction port, and that constitutes a water valve together with the water valve element; A spring that is loosely inserted into the valve and biases the water valve body in the direction of the water valve seat; and a water valve body fixed to the valve shaft and withdrawn from the valve shaft. A stopper for preventing the hot water from flowing, a hot water valve body attached to the valve shaft and capable of reciprocating in the axial direction of the valve shaft in the hot water valve chamber, and disposed between the hot water inlet and the hot water valve chamber. A first hot-water valve seat that constitutes a first hot-water valve together with the hot-water valve element, and a second hot-water valve together with the hot-water valve element disposed between the hot-water valve chamber and the mixing chamber. A second hot water valve seat that comprises: a. When the valve shaft is in the water guiding position, the hot water valve body is closely fitted to the first hot water valve seat and the first hot water valve seat is closed.
The hot water valve is closed, the water valve body is separated from the water valve seat, and the water valve is opened; b. When the valve shaft is at the mixing ratio adjusting position, the hot water valve body is located between the first hot water valve seat and the second hot water valve seat, and the first hot water valve and the second hot water valve are disposed between the first hot water valve seat and the second hot water valve seat. (2) the hot water valve is opened, the water valve body is separated from the water valve seat, and the water valve is opened; c. When the valve shaft is at the flow rate adjusting position, the hot water valve element is located between the first hot water valve seat and the second hot water valve seat, and the first hot water valve and the second hot water valve are disposed between the first hot water valve seat and the second hot water valve seat. The hot water valve is opened, the water valve body is closely fitted to the water valve seat, the water valve is closed, d. When the valve shaft is in the closed position, the hot water valve body is closely fitted to the second hot water valve seat, the second hot water valve is closed, and the water valve body is the water valve seat. Wherein the water valve is closed and the water valve is closed. 10. The composite valve according to claim 9, wherein a constant bypass pipe is formed in the valve housing to connect the water inlet and the hot water inlet.