JP2003083614A - Hot-water supplier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-water supplier capable of restraining the supply of high-temperature hot-water even when the hot-water is supplied again under a condition that both of routes of hot-water and water are opened after the hot-water supply is stopped by a mixing valve for mixing the hot-water into the water. SOLUTION: When the stopping of mixed hot-water supply in a pipeline 17 is detected by a flow rate counter 72, a controller 200 controls the opening degree of the mixing valve 16 for mixing hot-water into water so that the hot-water side (discharging pipe 14 side) is small and a water side (feed water pipeline 15 side) is large for a predetermined time after stopping the supply of the hot-water. According to this method, the discharge of high-temperature hot-water is restrained even when the hot-water is supplied within the predetermined time whereby the uncomfortable feeling of a user can be restrained.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water heater,
Particularly, the present invention relates to a hot water storage type hot water supply device provided with a means for mixing hot water and water.

[0002]

2. Description of the Related Art As a conventional technique, for example, Japanese Patent Publication No. 7-72.
There is a hot water supply device disclosed in Japanese Patent No. 620.

This hot water supply device is provided with a heater as a heating means in the hot water storage tank, and heats water sent from the water supply path into the hot water storage tank to store the hot water and send it out from the hot water supply path. The hot water supply path and the hot water supply path are connected by a bypass path that bypasses the hot water storage tank, and hot water and water are mixed at the confluence of the hot water supply path and the bypass path, and are sent to the mixed hot water path on the downstream side. There is.

The mixing ratio of hot water and water is controlled by a ratio control valve (mixing means) provided at a branch point where the bypass path branches from the hot water supply path or a confluence of the hot water supply path and the bypass path. At the time of hot water supply, the ratio control valve is controlled according to the hot water supply set temperature, and when the hot water supply is stopped, the ratio control valve is held in the state when hot water supply is stopped for a predetermined time, and the hot water supplied to the mixed hot water passage after a predetermined time elapses. It is configured to block one of the water paths.

With this, it is intended to promptly deal with re-hot water supply within the predetermined time.

[0006]

However, in the above-mentioned prior art, since the ratio control valve is maintained in the state when hot water supply is stopped within the predetermined time after hot water supply is stopped, hot water is supplied from the hot water supply path to the bypass path. Go around. Therefore, when hot water is re-heated within the predetermined time, the hot water supplied from the hot water supply path to the mixed hot water path and the hot water flowing into the bypass path are mixed and sent. There is a problem in that hot water may be supplied and the user may feel uncomfortable.

Further, when the flow rate at the time of re-hot water supply is smaller than the flow rate before the hot water supply is stopped, this tendency becomes remarkable.

The present invention has been made in view of the above points, and suppresses the supply of high temperature hot water even when hot water is re-supplied within a short time after the hot water supply is stopped. It is an object of the present invention to provide a hot water supply device that can be used.

[0009]

In order to achieve the above-mentioned object, in the invention described in claim 1, a hot water storage tank (1) for heating the internal water by a heating means (2) and storing it as hot water is provided. , A hot water supply path (12) for sending water to the hot water storage tank (1), a hot water supply path (14) for sending hot water stored in the hot water storage tank (1), and a hot water supply path (12) branching off from the hot water storage tank (1) ), A hot water supply path (14) and a bypass path (1), a hot water supply path (14) and a bypass path (1)
5) Mixing that is provided at the confluence point and controls the mixing ratio of hot water passing through the hot water supply path (14) and water passing through the bypass path (15) by adjusting the opening of each path (14, 15). The means (16) and the mixed hot water path (17) are provided,
When the hot water supply detecting means (72) detects whether hot water is supplied through the mixed hot water path (17) and when the hot water supply detecting means (72) detects the supply of hot water through the hot water mixing path (17),
The mixing ratio of the mixing means (16) is controlled according to the hot water supply set temperature, and when the hot water supply detection means (72) detects a hot water supply stop passing through the hot water supply path (17), a predetermined time after the hot water supply stop is detected. Controls the opening of the mixing means (16) so that the proportion of the hot water becomes smaller than when the hot water supply is stopped, and closes the hot water supply path (14) side of the mixing means (16) after the elapse of the predetermined time. Control means (20)
0) and are provided.

According to this, during the predetermined time after the hot water supply is stopped, the opening degree of each path of the hot water and the water in the mixing means (16) is higher than that when the hot water supply is stopped (when hot water is supplied immediately before the hot water supply is stopped). Is controlled so that the opening degree of the path is reduced. Therefore, even if hot water is re-supplied within the predetermined time, the mixing means (16) can be in a state of supplying less hot water than before the hot water supply was stopped. In this way, even if hot water wraps around from the hot water supply path (14) to the bypass path (15), it becomes possible to suppress the supply of high-temperature hot water during re-hot water supply.

Further, at the time of re-hot water supply after the predetermined time, the mixing means (16) starts from the state in which the hot water supply passage (14) side is closed and the bypass passage (15) side is opened.
4) is controlled so as to open the side, so that the hot water supply path (14) is bypassed to the bypass path (15) within the predetermined time.
With the hot water that has circulated around, it is possible to mitigate the temperature drop at the start of re-hot water supply.

Further, the invention according to claim 2 is characterized in that the control means (200) varies the predetermined time period in accordance with the amount of hot water stored in the hot water storage tank (1).

Further, specifically, as in the invention described in claim 3, the control means (200) makes the predetermined time longer as the amount of hot water stored in the hot water storage tank (1) increases. The feature is that it is controlled to

According to these, the more the amount of hot water stored in the hot water storage tank (1) is, that is, the lower the boundary position between the hot water and the hot water in the hot water storage tank (1) is due to the specific gravity relationship of the hot water. By increasing the predetermined time, it is possible to increase the amount of hot water flowing from the hot water supply path (14) to the bypass path (15) within the predetermined time. Therefore, the temperature drop at the start of re-hot water supply can be further alleviated.

Further, the invention according to claim 4 is characterized in that the control means (200) varies the predetermined time period according to the temperature of the hot water stored in the hot water storage tank (1).

[0016] More specifically, as in the invention described in claim 5, the control means (200) determines the predetermined value as the temperature difference between the hot water in the hot water storage tank (1) and the water is smaller. It is characterized by controlling to lengthen the time.

According to these, the smaller the temperature difference between the hot water and the water in the hot water storage tank (1), the smaller the difference in specific gravity between the hot water and the water. Therefore, by increasing the predetermined time, Hot water supply route (14) to bypass route (15)
It is possible to make sure that the hot water wraps around. Therefore,
It is possible to reliably mitigate the temperature drop at the start of re-hot water supply.

Further, as in the invention described in claim 6, the hot water storage tank (1) can be constructed by connecting a plurality of tanks (1a, 1b).

The reference numerals in parentheses attached to the above-mentioned means indicate the correspondence with the specific means described in the embodiments described later.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing a schematic configuration of the hot water supply apparatus of this embodiment.

Reference numeral 1 denotes a metal (for example, stainless steel) hot water storage tank having excellent corrosion resistance, and a heat insulating material (not shown) is arranged on the outer periphery of the hot water storage tank so that hot water for hot water supply can be kept warm for a long time. It is like this. Hot water storage tank 1
Has a vertically long shape, and an inlet 11 is provided on the bottom surface thereof, and an inlet pipe 12 which is a water supply path for introducing tap water into the hot water storage tank 1 is connected to the inlet 11.

A water supply thermistor 21, which is a temperature detecting means, is provided in the introduction pipe 12, and the temperature information in the introduction pipe 12 is output to a control device 200 described later. Further, the introduction pipe 12 is provided with a pressure reducing valve 51 for adjusting the pressure of the introduced tap water to a predetermined pressure. The downstream side of the position where the water supply thermistor 21 and the pressure reducing valve 51 of the introduction pipe 12 are provided and the mixing valve 16 described later are connected by a water supply pipe 15 that is a bypass path.

On the other hand, the outlet 1 is provided at the top of the hot water storage tank 1.
3 is provided, and a lead-out pipe 14 which is a hot water supply path for leading out hot water in the hot water storage tank 1 is connected to the lead-out port 13. A discharge pipe 52 in which a relief valve 53 is arranged is connected in the middle of the outlet pipe 14, and when the pressure in the hot water storage tank 1 rises above a predetermined pressure, the hot water in the hot water storage tank 1 is discharged to the outside. It is designed so that it will not be damaged by damaging the hot water storage tank 1 etc.

Reference numeral 16 is a mixing valve which is a mixing means and is arranged at the confluence of the outlet pipe 14 and the water supply pipe 15. Then, the mixing valve 16 adjusts the opening area ratio (the ratio of the opening degree on the hot water side communicating with the outlet pipe 14 to the opening degree on the water side communicating with the water supply pipe 15) to adjust the hot water and the water supply from the outlet pipe 14. The mixing ratio with the tap water from the pipe 15 can be adjusted.

The mixing valve 16 is an electrically operated valve that drives a valve element by a drive source such as a servomotor to adjust the opening of each path, and operates in response to a control signal from a control device 200, which will be described later. The state is output to the control device 200.

On the outlet side of the mixing valve 16, a faucet, a shower,
A pipe 17 which is a mixed hot water route to a bath or the like is connected.
The pipe 17 is provided with a hot water supply thermistor 71 which is a temperature detecting means and a flow rate counter 72 which is a hot water supply detecting means. The hot water supply thermistor 71 shows temperature information in the pipe 17 and the flow rate counter 72 shows flow rate information in the pipe 17. The data is output to the control device 200 described later.

When the flow rate counter 72 detects the flow of water in the pipe 17, it means that hot water is about to be used in any of the faucet, shower, bath and the like. At this time, the control device 200 roughly adjusts the opening area ratio of the mixing valve 16 from the temperature information from the water supply thermistor 21 and the temperature information from the outlet hot water thermistor 32 described later according to the set temperature, and then from the hot water supply thermistor 71. The opening area ratio of the mixing valve 16 is finely controlled so that the hot water supply temperature becomes the set temperature based on the temperature information.

A suction port 18 for sucking the water in the hot water storage tank 1 is provided at the bottom of the hot water storage tank 1, and a discharge port 19 for discharging hot water into the hot water storage tank 1 is provided at the upper side surface of the hot water storage tank 1. Is provided. The suction port 18 and the discharge port 19 are connected by a circulation circuit 20, and a part of the circulation circuit 20 is arranged in the heat pump unit 2. A heat exchanger (not shown) is provided in a portion of the circulation circuit 20 arranged in the heat pump unit 2, and the suction port 18
The water in the hot water storage tank 1 sucked in from is heated by heat exchange with the high temperature refrigerant, and is returned from the discharge port 19 into the hot water storage tank 1, so that the water in the hot water storage tank 1 can be boiled.

The heat pump unit 2 is the heating means in this embodiment. The heat pump unit 2
Is operated by a control signal from the control device 200, which will be described later, and outputs the operating state to the control device 200.

A hot water outlet thermistor 32 for detecting the water temperature in the upper portion of the hot water storage tank 1 is provided on the upper outer wall surface of the hot water storage tank 1, and the temperature information of the water led out from the outlet 13 is sent to the control device 200 which will be described later. It is designed to output.

On the outer wall surface of the hot water storage tank 1, a plurality of (six in this example) water level thermistors 33 are arranged at substantially equal intervals in the vertical direction, and at each water level of the water filled in the hot water storage tank 1. The temperature information of the above is output to the control device 200 described later. Therefore, the control device 200
Based on the temperature information from the water level thermistor 33, it is possible to detect the boundary position between the boiled hot water above the hot water storage tank 1 and the water below the hot water inside the hot water storage tank 1 before being boiled.

Reference numeral 200 denotes a control device which is a control means, and temperature information from each thermistor 21, 32, 33, 71, flow rate information from the flow rate counter 72, and an operation switch provided on an operation panel (not shown). Based on the signal and the like, the heat pump unit 2, according to the procedure described later,
It is configured to control the mixing valve 16 and the like.

The operation panel (not shown) is installed near a place where hot water is used, such as in a bathroom or kitchen, and other than the operation panel, it is installed in an appropriate place such as outdoors.

Next, the operation of the water heater will be described based on the above configuration.

FIG. 2 is a flowchart showing the overall schematic control operation of the control device 200.

When a power switch (not shown) of the hot water supply device is turned on, control device 200 first performs normal temperature control hot water supply control (step S101). When the temperature-controlled hot water supply control is executed, the control device 200 appropriately sets the heat pump unit 2 based on the temperature information from each thermistor provided in the hot water storage tank 1 and the time information set by an operation panel (not shown). Is operated to heat the water in the hot water storage tank 1 to form hot water (for example, 85 ° C. hot water).

When it is determined that the faucet or the like has been opened based on the flow rate information from the flow rate counter 72, the hot water having the set temperature set by the operation panel (not shown) is mixed with the mixing valve 16
Control and supply. Then, based on the flow rate information from the flow rate counter 72, it is determined whether the faucet or the like is closed. That is, it is determined whether the hot water supply is stopped from the hot water supply via the pipe 17 (step S102). When the hot water supply stop state or the hot water supply state continues, the process returns to step S101.

When it is determined in step S102 that the hot water supply state has changed to the hot water supply stop state, the control device 2
00 is the opening of the mixing valve 16 on the hot water side (opening on the outlet pipe 14 side) of 9 when the hot water supply is stopped (that is, immediately before the hot water supply is stopped).
The mixing valve 16 is controlled to be 0% (step S1).
03). For example, when the hot water side opening and the water side opening (opening on the water supply pipe 15 side) when the hot water supply is stopped are both 50%, the hot water side opening is set to 45%, and The mixing valve 16 is controlled so that the opening is 55%.

After step S103 is executed, it is determined based on the flow rate information from the flow rate counter 72 whether hot water supply has been restarted (step S104). When the hot water supply is restarted, the process returns to step S101, and when the hot water supply is not restarted, it is determined whether 5 seconds have elapsed (step S105), and whether or not the hot water supply is restarted is monitored for 5 seconds.

When 5 seconds have elapsed without restarting hot water supply, the hot water side opening of the mixing valve 16 is set to 0% (the hot water side is closed) and the water side opening is set to 100%. The mixing valve 16 is controlled (step S106). That is, step S
After continuing the control state of 103 for 5 seconds, step S10
6 control is executed. Then, after executing step S106, the process returns to step S101.

According to the above configuration and operation, the outlet pipe 14 is provided for 5 seconds after the hot water supply is stopped by closing the faucet or the like.
Although the hot water flows into the water supply pipe 15 through the mixing valve 16 from the side, even if the tap is opened and re-hot water is supplied in the 5 seconds, the opening degree of the mixing valve 16 on the outlet pipe 14 side is reduced. In addition, since the opening on the side of the water supply pipe 15 is increased, it is possible to prevent hot water having a temperature higher than the set temperature from coming out of the faucet or the like.

FIG. 3 shows the results of the inventors' investigation of the temperature of the hot water supplied when the opening degree of the mixing valve 16 is changed in the hot water supply apparatus of this embodiment. The temperature of the hot water supplied from the outlet pipe 14 (the temperature detected by the hot water discharge thermistor 32) is 8
When the temperature of the water supplied from the water supply pipe 15 (the temperature detected by the water supply thermistor 21) is 10 ° C.,
It shows the temperature of the hot water supplied from the pipe 17.

As is apparent from FIG. 3, the temperature of hot water supplied through the pipe 17 can be lowered by making the opening of the mixing valve 16 on the hot water side smaller in step S103 than when the hot water supply is stopped. Therefore, if hot water supply is restarted within a short time (5 seconds) after the hot water supply is stopped,
Even if there is hot water that has spilled from the outlet pipe 14 side to the water supply pipe 15 side, it is possible to restart hot water supply from a temperature close to the set temperature and suppress high temperature hot water discharge. In this way
It is possible to prevent the user from feeling uncomfortable due to hot water discharge.

Further, when the flow rate to be supplied is small at the beginning of resuming hot water supply (in the present embodiment, the flow rate in the pipe 17 is about 2 L / min or less in this embodiment), the supply from the pipe 17 is performed. Since there is a tendency for the temperature of the hot water (hot water temperature) to rise, the present embodiment has a great effect of suppressing hot hot water.

Further, when hot water supply is restarted after 5 seconds or more have elapsed since the hot water supply was stopped, the mixing valve 16 is set to 100 on the water side.
Since the degree of opening is adjusted so that the temperature reaches the set temperature from the state of%, it is easy to prevent hot water having a temperature higher than the set temperature from being discharged. Further, re-hot water supply is started in a state where the hot water flowing from the outlet pipe 14 side to the water supply pipe 15 side is mixed for 5 seconds after the hot water supply is stopped, so that the user is prevented from feeling uncomfortable due to the low temperature hot water discharge. it can.

In this embodiment, step S1
If there is no hot water supply again, the control state of 03 is maintained for 5 seconds, and then the control of step S106 is performed. This is because in the hot water supply apparatus of the present embodiment, the hot water wraps around from the outlet pipe 14 side to the water supply pipe 15 side for 5 seconds after the hot water supply is stopped regardless of the amount of hot water in the hot water storage tank 1.

FIG. 4 is a result showing the relationship between the amount of hot water in the hot water storage tank 1 investigated by the present inventors and the temperature in the water supply pipe 15 after the hot water supply is stopped. In the graph shown in FIG. 4 (b), as shown in FIG. 4 (a), the boundary position between hot water and water in the hot water storage tank 1 (the position indicated by the alternate long and short dash line in the drawing) is shown at the bottom (I in the drawing). Range), the central part (range indicated by II in the figure)
2 shows the temperature change in the water supply pipe 15 after the hot water supply is stopped in the case of 1) and in the case of the upper part (the range indicated by III in the figure). This temperature is detected by the thermistor 300 provided near the mixing valve 16 of the water supply pipe 15 for this investigation.

As is clear from FIG. 4 (b), the hot water circulates from the outlet pipe 14 to the water supply pipe 15 for almost 5 seconds regardless of the boundary position between the hot water and the water in the hot water storage tank 1, 5 seconds after hot water supply is stopped, the hot water side of the mixing valve (outlet pipe 14 side)
It is possible to reliably hold the hot water that has flowed into the water supply pipe 15 by closing the. It should be noted that in FIG. 4A, the illustration of other than the essential parts is omitted.

FIG. 5 shows that when the set temperature is 40.degree.
This is the result of measuring the hot water outlet temperature at the faucet outlet when hot water was supplied again by opening the faucet after 5 seconds or more had elapsed since the hot water supply was stopped. T1 is based on the control of the present embodiment, and T2 is based on the control of steps S103 to S105 of the flow shown in FIG. 2 and the control of step S106 immediately after the hot water supply is stopped.

Even if the hot water flowing from the outlet pipe 14 into the water supply pipe 15 for 5 seconds causes the mixing valve 16 to be re-opened from the water-side condition of 100%, the decrease in the hot water temperature at the faucet can be suppressed. Have confirmed.

(Other Embodiments) In the above embodiment, as shown in FIG. 2, regardless of the amount of hot water in the hot water storage tank 1 (that is, the boundary position between the hot water and the hot water), re-hot water is supplied after the hot water supply is stopped. Mixing valve 16 controlled by step S103 when not present
Although the maintenance time of the opening state of 5 is set to 5 seconds, the maintenance time may be changed according to the amount of hot water in the hot water storage tank 1.

For example, when the boundary position between the hot water and the water in the hot water storage tank 1 shown in FIG. 4 is II or III, it is 5 seconds, and when the boundary position is I, the temperature in the water supply pipe 15 is almost saturated. It may be 30 seconds. Accordingly, when the boundary position is I (when the amount of hot water is large), the amount of hot water flowing from the outlet pipe 14 side to the water supply pipe 15 side can be increased.

In the hot water supply apparatus according to the above-described embodiment, the present inventors assume that the boundary position between the hot water and the water in the hot water storage tank 1 is I and the mixing valve 16 maintenance time after the hot water supply is stopped is 30 seconds. In addition, the minimum value (falling temperature) of the tapping water when the maintenance time is 5 seconds shown in FIG.
It has been confirmed that the temperature rises to 8.7 ° C.

Further, the maintenance time of the opening state of the mixing valve 16 controlled in step S103 may be changed according to the operating state of the heat pump unit 2. When the heat pump unit 2 is operating,
Water flows in the circulation circuit 20 in the direction of the arrow shown in FIG.
As a result, the pressure in the upper part of hot water storage tank 1 becomes slightly higher than the pressure in the lower part, and when the hot water supply is stopped, the hot water easily moves from outlet pipe 14 toward water supply pipe 15.

Therefore, by changing the maintenance time according to the flow rate in the circulation circuit 20 (making the maintenance time longer when the flow rate is large), it is possible to increase the amount of hot water flowing into the water supply pipe 15. is there. However, it is not preferable to extend the maintenance time so that the circulated hot water enters the hot water storage tank 1 through the introduction port 11. Inlet 1
This is because the hot water and the water in the hot water storage tank 1 are unnecessarily agitated when hot water enters from 1 and is not preferable for hot water storage.

Further, in the above embodiment, as shown in FIG. 2, the mixing valve 16 controlled by step S103 in the case where there is no hot water supply after the hot water supply is stopped regardless of the temperature of the hot water or water in the hot water storage tank 1. Although the maintenance time of the opening state is 5 seconds, the maintenance time may be changed according to the temperature of the hot water in the hot water storage tank 1 or the temperature difference between the hot water and the hot water.

The larger the temperature difference between the hot water and the hot water in the hot water storage tank 1, the outlet pipe 1 at the time of hot water supply stop due to the difference in specific gravity.
The moving speed of the hot water in 4 or in the water supply pipe 15 is increased. Therefore, the amount of hot water flowing into the water supply pipe 15 can be adjusted by changing the maintenance time in accordance with the temperature difference between the hot water and the water in the hot water storage tank 1.

FIG. 6 shows the boundary position between the hot water and the hot water in the hot water storage tank 1 in the hot water supply apparatus according to the above embodiment.
Thermistor 300 in the range of III shown in
(Shown in FIG. 4) shows the temperature detected after the hot water supply is stopped, where T3 is the hot water storage temperature (temperature of hot water in the hot water storage tank 1).
Is 85 ° C., T4 is the result when the hot water storage temperature is 65 ° C. By the way, the temperature of the water in the hot water storage tank 1 is 10 ° C.
Is. The hot water temperature and the water temperature in the hot water storage tank 1 are detected by the hot water discharge thermistor 32 and the water level thermistor 33.

As shown in FIG. 6, T3 is about 5 after the hot water supply is stopped.
In contrast to the peak in seconds, T4 peaks approximately 8 seconds after the hot water supply is stopped. Therefore, by setting this peak time as the maintenance time of the opening state of the mixing valve 16 controlled by step S103 (shown in FIG. 2) when there is no hot water supply after hot water supply is stopped, hot water into the water supply pipe 15 is It is possible to increase the amount of wraparound. According to this, it is possible to further suppress the user from feeling uncomfortable due to the low temperature hot water.

The temperature of the water in the hot water storage tank 1 may be the detection value of the water supply thermistor 21, which is substantially equal to the temperature of the water in the hot water storage tank 1, regardless of the detection value of the water level thermistor 33. Further, when the change in the supply water temperature is small, the maintenance time may be controlled by the temperature of the hot water in the hot water storage tank 1.

In the above embodiment, the hot water storage tank 1
Was constituted by one tank, but it may be a hot water storage tank constituted by connecting a plurality of tanks. For example, two tanks may be connected in series as shown in FIG. 7 (a), or three tanks may be connected as shown in FIG. 7 (b).
The two tanks may be connected in series.

As described above, in the hot water storage tank 1 in which a plurality of tanks are connected, the invention in which the control is changed according to the boundary position between the hot water and the water in the hot water storage tank 1 is such that the boundary between the hot water and the water is It can be applied to some tanks.

For example, in the hot water storage tank 1 shown in FIG. 7 (a), the boundary position between the hot water and the water shown by the alternate long and short dash line is within the tank 1a, so the tank 1a is controlled according to the boundary position. I wish I had it. Further, when the boundary position is moved to the tank 1b, the tank 1b may be controlled according to the boundary position.

Further, for example, in the hot water storage tank 1 shown in FIG. 7B, since the boundary position between the hot water and the water shown by the alternate long and short dash line is in the tank 1d, the tank 1d is controlled according to the boundary position. Anything will do. Further, when the boundary position is moved to the tank 1c or the tank 1e, it is sufficient to control the tank having the boundary position according to the boundary position.

In FIG. 7, illustration of parts other than the main part is omitted.

In the above embodiment, 90%,
A real value such as 5 seconds is an example, and can be set as appropriate according to the arrangement position of the mixing valve, the length of the pipe, various characteristics of the hot water supply device such as routing, and the like.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a hot water supply device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an overall schematic control operation of a control device 200 according to an embodiment of the present invention.

FIG. 3 is a graph showing the relationship between the opening degree of the mixing valve 16 and the hot water outlet temperature in one embodiment of the present invention.

FIG. 4 is a schematic diagram and a graph of a main part configuration for explaining the relationship between the amount of hot water in the hot water storage tank 1 and the temperature in the water supply pipe 15 after the hot water supply is stopped in one embodiment of the present invention.

FIG. 5 is a graph showing the effect of suppressing low temperature hot water discharge in an embodiment of the present invention.

FIG. 6 is a graph showing a relationship between a temperature difference between hot water and water in a hot water storage tank 1 and a temperature in a water supply pipe 15 after stopping hot water supply in another embodiment.

FIG. 7 is a schematic diagram showing a configuration of a hot water storage tank 1 according to another embodiment.

[Explanation of symbols]

1 Hot water storage tank 1a, 1b, 1c, 1d, 1e tanks 2 Heat pump unit (heating means) 12 Introduction pipe (water supply route) 14 Outlet pipe (hot water supply route) 15 Water supply pipe (bypass route) 16 mixing valve (mixing means) 17 Piping (mixed hot water route) 21 Water Supply Thermistor 32 Dew Bath Thermistor 33 Water Level Thermistor 72 Flow rate counter (hot water supply detection means) 200 Control device (control means)

Claims (6)

[Claims] 1. A hot water storage tank (1) for heating internal water by a heating means (2) and storing the hot water therein, a water supply path (12) for feeding water to the hot water storage tank (1), and the hot water storage A hot water supply path (14) for sending hot water stored in the tank (1), a bypass path (15) branched from the water supply path (12) and bypassing the hot water storage tank (1), and the hot water supply path (14) And the bypass passage (15) and a mixed hot water passage (17), and the hot water that is provided at the confluence of the hot water supply passage (14) and the bypass passage (15) and passes through the hot water supply passage (14) and the bypass. The mixing means (16) for controlling the mixing ratio of water passing through the path (15) by adjusting the opening degree of each path (14, 15) and the mixing hot water path (17), Whether hot water is supplied through the hot water route (17) When the hot water supply detecting means (72) for detecting the hot water supply and the hot water supply detecting means (72) detect the supply of hot water passing through the mixed hot water passage (17), the hot water supply detecting means (72) detects the hot water by the mixing means (16). While controlling the mixing ratio, when the hot water supply detecting means (72) detects a hot water supply stop passing through the mixed hot water passage (17), the mixing means (16) is operated for a predetermined time after the hot water supply stop is detected. Control means for controlling the opening so that the proportion of hot water becomes smaller than when hot water supply is stopped, and for controlling the hot water supply path (14) side of the mixing means (16) after the elapse of the predetermined time. (200) and a hot water supply device. 2. The hot water supply apparatus according to claim 1, wherein the control means (200) varies the predetermined time period according to the amount of hot water stored in the hot water storage tank (1). 3. The control means (200) controls such that the predetermined time is lengthened as the amount of hot water stored in the hot water storage tank (1) increases. Hot water supply device described. 4. The control means (200) varies the predetermined time according to the temperature of the hot water stored in the hot water storage tank (1).
Hot water supply device according to any one of. 5. The control means (200) controls such that the predetermined time is lengthened as the temperature difference between hot water and water in the hot water storage tank (1) becomes smaller. The water heater according to item 4. 6. The hot water supply apparatus according to claim 1, wherein the hot water storage tank (1) is configured by connecting a plurality of tanks (1a, 1b).