KR20130118796A - Hot water supply system - Google Patents

Abstract

PURPOSE: A hot water supply system is provided to prevent high temperature water from coming out from the outlet of a tapping pipe by replacing the high temperature water with lower temperature water. CONSTITUTION: A hot water supply system comprises a storage tank (10), a heating unit (9), a tapping pipe (17), a water supply pipe (18), a mixing ratio change unit (28), a hot water cut-off detection unit (31), a combustion water heater (3), a tapping bypass pipe (20), a bypass valve (21), a water heating temperature setting unit (33), and a hot water supply control unit (42). The hot water supply control unit enables the control of bypass temperature to adjust the opening of the bypass valve and mix hot water in the tapping pipe downstream of the combustion water heater with hot water from the tapping bypass pipe in order to obtain hot water at a predetermined temperature when controlling the heating temperature. [Reference numerals] (AA) Bathtub; (BB) Water; (CC) Hot water

Description

Hot water supply system {HOT WATER SUPPLY SYSTEM}

The present invention relates to a hot water supply system in which a instantaneous heating water heater is connected in series to a downstream side of a water storage tank.

Background Art Conventionally, a hot water supply system including a hot water storage tank for storing hot water heated by an external heating means and an instantaneous heating combustion hot water heater connected in series to a downstream side of the hot water tank (for example, a patent) See Document 1).

According to this, even if hot water cut | disappearance arises in a water storage tank, and the temperature of the hot water derived from a water storage tank falls, it can be heated by hot water supply to a desired temperature by a combustion hot water heater.

However, when the combustion hot water heater is directly connected to the downstream side of the hot water tank, the flow path of the hot water from the hot water tank to the outlet of the tapping pipe through the combustion hot water heater becomes long. For this reason, the pressure loss (hereinafter, referred to as pressure loss) of the hot water in the distribution path passing through the combustion hot water heater increases, so that a sufficient hot water flow rate may not be obtained.

Therefore, it is conceivable to provide a bypass pipe for bypassing the combustion water heater and to install a bypass valve for opening and closing the bypass pipe. When the hot water is not cut off in the hot water tank, by opening the bypass valve and sending hot water of the hot water tank to the outlet of the hot water pipe, pressure loss can be reduced and hot water can be supplied without passing the flow path of the combustion hot water heater. have.

Patent Document 1: Japanese Patent Publication No. 2000-329401

However, when hot water breaks in the storage tank and additional heating is performed by the combustion hot water heater, it is necessary to close the bypass valve and send the hot water of the hot water tank to the distribution path of the combustion hot water heater, in which case the pressure loss can be reduced. Can't.

In view of the above, an object of the present invention is to provide a hot water supply system capable of reducing pressure loss in a distribution channel of hot water even when hot water is cut off in a hot water tank and additional heating by a combustion hot water heater is performed. It is done.

In order to achieve this object, the present invention provides a water storage tank, heating means for heating and generating hot water stored in the water storage tank, a tapping pipe for drawing hot water of the boiling water tank, a water supply pipe connected to the boiling water tank and the tapping water pipe, Mixing ratio changing means for changing the mixing ratio of the hot water of the tapping pipe drawn from the storage tank and the water supplied from the water supply pipe to the tapping pipe, hot water break detection means for detecting the hot water break in the boiling tank, and the connection portion between the tapping pipe and hot water A combustion hot water heater installed in the middle of the downstream hot water pipe and heating the hot water of the hot water pipe by a burner, and a hot water bypass pipe which bypasses the hot water hot water pipe and connects the hot water pipe to the upstream side and the downstream side of the hot water pipe. And a hot water supply temperature setting means for setting a hot water supply temperature obtained from the outlet of the hot water supply pipe, a bypass valve for opening and closing the hot water supply bypass pipe, and When the hot water cutout of the water storage tank is not detected by the disconnection detecting means, the mixing valve is controlled to adjust the mixing ratio by the mixing ratio changing means so that the bypass valve is opened to obtain hot water of the hot water setting temperature. And a hot water supply control means for heating the hot water of the hot water supply pipe by a combustion hot water heater so as to obtain hot water having a hot water set temperature when a hot water break of the water storage tank is detected by the hot water break detection means. In the hot water supply system, the hot water supply control means adjusts the opening degree of the bypass valve so that hot water of the hot water set temperature is obtained when the heating temperature adjustment control is performed, and the tap water is bypassed to the hot water in the hot water pipe of the hot water pipe downstream of the combustion hot water heater. Bypass temperature regulation control which mixes hot water from a pipe is enabled, It is characterized by the above-mentioned. .

According to the present invention, when the hot water supply control means performs the bypass temperature regulation control, when the heating temperature regulation control is performed, that is, when hot water is cut off in the hot water tank, the hot water in the hot water supply pipe is heated by the combustion hot water heater. Since the hot water from the tapping bypass pipe joins the tapping pipe on the downstream side of the combustion hot water heater, the pressure loss of the hot water passing through the tapping hot water tap can be reduced by the tap water from the tapping water bypass tube.

In the present invention, the hot water supply control means may include a first hot water heater operation control for controlling the operation of the hot water heater with the predetermined heating temperature higher than the hot water supply set temperature as the target heating temperature, , And a second hot water heater operation control for controlling the operation of the hot water heater with the hot water supply set temperature as the target heating temperature.

According to the present invention, when the hot water supply control means performs the bypass temperature regulation control, either one of the first hot water heater operation control and the second hot water heater operation control is selected. As a result, when the pressure loss of the hot water passing through the combustion hot water heater is relatively large, the pressure loss can be sufficiently reduced by selecting the first hot water heater operation control to increase the amount of hot water mixed from the tapping bypass pipe to the hot water pipe. When the pressure loss of the hot water passing through the hot water heater is relatively small, it is possible to select the second hot water heater operation control to suppress the fuel consumption of the combustion hot water heater.

Moreover, when the flow volume of the hot water when passing through the tapping pipe of a combustion hot water heater is comparatively large, the passage resistance of the tapping water in a tapping pipe also becomes large. On the other hand, when the flow rate of the hot water when passing through the tapping tube of a combustion hot water heater is comparatively small, the passage resistance of the tapping water in a tapping tube also becomes small. Specifically, for example, when the flow rate of the hot water in the hot water pipe is relatively large, the first hot water heater operation control is selected, and when the flow rate of the hot water in the hot water pipe is relatively small, the second hot water heater is operated. You can illustrate selecting the control.

Further, the hot water supply control means, in the first hot water heater operation control at a speed at which the opening and closing operation of the bypass valve can be followed when the first hot water heater operation control and the second hot water heater operation control are changed from one side to the other. It is preferable to gradually change the target heating temperature and the target heating temperature in the second hot water heater operation control from one side to the other.

When the target heating temperature is suddenly changed in the combustion hot water heater, the opening and closing operation of the bypass valve under bypass temperature regulation control cannot be followed, and the desired hot water temperature may not be obtained from the outlet of the tapping pipe. Therefore, the hot water supply from the outlet of the tapping pipe is changed slowly by changing the target heating temperature of the combustion hot water heater so that the opening / closing operation of the bypass valve follows the temperature change of the hot water caused by the heating on the combustion hot water heater side to ensure the bypass temperature regulation control. The unstable state of temperature can be suppressed and a bypass temperature regulation control can be performed precisely.

In the present invention, the hot water supply control means, when the tapping from the outlet of the tapping pipe is stopped at the time of performing the bypass temperature regulation control, until the first predetermined time elapses from the tapping stop, The bypass valve is maintained at the opening degree just before the tapping of the tapping pipe exit is stopped, and when tapping from the tapping exit of the tapping pipe is resumed within the first predetermined time, the second predetermined time is set from the start of tapping. Until the elapsed time, the bypass valve is maintained at an opening degree just before the tapping of the tapping pipe is stopped, and the first predetermined time is downstream of the combustion hot water heater and upstream from the downstream end of the tapping bypass pipe. The hot water remaining in the tapping pipe on the side is set in advance based on the required time until the predetermined temperature decreases due to heat dissipation. The hot water in the tapping pipe downstream of the tapping machine and upstream from the downstream end of the tapping bypass pipe is set in advance based on the required time from which the tap water is discharged from the tapping outlet.

When the tapping from the outlet of the tapping tube is stopped at the time of performing the bypass temperature control control, the hot water is relatively hot inside the tapping pipe downstream of the combustion hot water heater and upstream from the downstream end of the tapping bypass pipe. Stay. And the hot water of a relatively hot water staying in the tapping pipe of the said position may be hot water supply from the tap of the tapping tap with relatively high temperature, when tapping from the tap of the tapping tap is resumed.

Therefore, in the present invention, the hot water supply control means maintains the opening degree of the bypass valve at the opening degree just before the tapping from the outlet of the tapping tube is stopped, so that the relatively high temperature stays in the tapping tube at the position. With respect to the hot and cold water, mixing of the relatively low temperature hot water from the tapping bypass pipe by the bypass temperature regulation control can be performed immediately. Thereby, the situation of hot water supply from the exit of the tapping pipe can be reliably avoided with a relatively high temperature.

Moreover, in this invention, the hot water filling tube which connects the tapping pipe and a bathtub downstream of the said combustion hot water heater, and is located upstream rather than the downstream end of the said tap water bypass pipe, and opens and closes the said hot water filling pipe, And a hot water filling valve, wherein the hot water filling control means performs hot water filling control for supplying hot water to the bathtub by opening the hot water filling valve at the time of stopping the tapping of water from the outlet of the tapping pipe. When the hot water filling control is performed within the first predetermined time, the bypass valve is maintained at the opening degree just before the tapping of the outlet of the tapping pipe is stopped until the third predetermined time elapses from the opening of the hot water filling valve. Thus, after the third predetermined time has elapsed, the bypass valve is closed, and the third predetermined time is the downstream side of the combustion hot water heater and the tapping bypass pipe. The downstream end of all the hot water kettle in the output of the upstream side on the basis of the time required to be sent into the hot water filling pipe is characterized in that it is set in advance.

In the present invention, when hot water is controlled by the hot water supply control means even when hot water is kept relatively hot in the hot water pipe on the downstream side of the combustion hot water heater and upstream from the downstream end of the hot water bypass pipe, The hot water of the hot water remaining in the tapping pipe of the position can be sent to the hot water filling pipe.

As a result, the hot water in the hot water pipe in the hot water pipe at the position can be flowed back to the combustion hot water heater from the downstream end of the hot water bypass pipe, for example, and replaced with the hot water in the hot water. The situation of hot water from the outlet of the gas can be reliably avoided.

1 is a block diagram of a hot water supply system of the present invention
2 is a flowchart showing main operations of the tank controller in the hot water supply system according to the present invention.
3 is a flowchart showing the main operations of the hot water heater controller in the hot water supply system of the present invention.
4 is a flowchart showing another operation of the tank controller in the hot water supply system of the present invention.
5 is a flowchart showing another operation of the tank controller in the hot water supply system of the present invention.

One Embodiment of this invention is described with reference to FIG. The hot water supply system of this embodiment is comprised by further connecting the instantaneous heating type combustion hot water heater 3 to the tank unit 2 to which the heat pump unit 1 was connected.

The heat pump unit 1 includes a compressor 4, a water heat exchanger (condenser) 5, an expansion valve (decompressor) 6, and an air heat exchanger (evaporator) 7 in a refrigerant circulation path 8. It is provided with the heat pump 9 (heating means) formed by connecting. The water heat exchanger 5 is connected to a tank circulation path 11 connected to the upper and lower portions of the water storage tank 10 to be described later, and the refrigerant of the refrigerant circulation path 8 (for example, HFC refrigerant such as R410A). The hot water of the tank circuit 11 is heated by heat-exchanging hot water of the tank circuit 11.

The tank circulation path 11 includes a circulation pump 12 for circulating the hot water stored in the water storage tank 10 in the tank circulation path 11, and a temperature of the water flow from the water heat exchanger 5 toward the water storage tank 10. The thermistor 13 which detects, and the thermistor 14 which detects the temperature of the hot water which flows from the water storage tank 10 toward the water heat exchanger 5 are provided.

Moreover, the heat pump unit 1 is equipped with the heat pump controller 15 comprised by the microcomputer etc., and the heat pump 9 and the circulation pump 12 by the control signal output from the heat pump controller 15. FIG. The operation of is controlled.

The heat pump controller 15 is connected to the tank controller 16 which can be mentioned later and can communicate, and thermistors 13 and 14 provided in the tank circulation path 11 when the heating instruction signal is received from the tank controller 16 are provided. Based on the detected temperature of), the circulation pump 12 and the heat pump 9 are operated to boil the hot water of the boiling water tank 10 to the boiling set temperature.

The tank unit 2 includes a water storage tank 10 filled with hot water and a tank controller 16 configured by a microcomputer or the like. A tapping pipe 17 is connected to the upper portion of the storage tank 10. The tapping pipe 17 has a start end connected to a water storage tank 10 and a tapping tap such as a faucet such as a faucet whose end is not shown.

The water supply pipe 18 is connected to the lower part of the water storage tank 10. The water supply pipe 18 has a start end connected to the tap water, the downstream side is divided into two, one end is connected to the water storage tank 10, and the other end is connected in the middle of the tapping pipe 17.

The hot water supply pipe 17 extends from the downstream of the connection portion with the water supply pipe 18 (the hot water mixing valve 28 described later is installed) to the outside of the tank unit 2, so that the hot water supply circuit of the combustion hot water heater 3 will be described later. After passing through (19), it is extended to the inside of the tank unit (2), in the meantime, the tapping bypass pipe 20 which is connected to the inlet side and the outlet side of the hot water heater circuit 19 of the combustion hot water heater (3). Is connected.

The bypass valve 21 is provided with a bypass valve 21. The bypass valve 21 is one that can be opened or closed in a no stage or multiple stages from full open to full occlusion.

When the bypass valve 21 is fully closed, the hot water from the boiling water tank 10 flows into the hot water heater circuit 19 of the combustion hot water heater 3, and when the bypass valve 21 is fully open, the hot water tank ( The hot water from 10) flows through the tapping bypass pipe 20 to a tap tap such as a faucet, a showerhead, or the like installed at the end of the tapping pipe 17.

A tapping amount sensor 22 is provided on an upstream side of the connection portion of the tapping tube 17 and the water supply pipe 18 in the tank unit 2. The water supply pipe 18 is provided with a water flow rate sensor 23 for detecting the water flow rate, a tank side check valve 24, a hot water supply side check valve 25, and a pressure reducing valve 26. . The water supply pipe 18 extended toward the connection portion with the tapping pipe 17 is provided with a water supply thermistor 27.

Moreover, the hot water mixing valve 28 (mixing ratio changing means) is provided in the connection part of the hot water supply pipe 17 and the water supply pipe 18 in the tank unit 2. The hot water mixing valve 28 causes the opening degree on the tapping pipe 17 side and the opening degree on the water supply pipe 18 side to be variable, and is accompanied by one opening operation on the tapping pipe 17 side and the water supply pipe 18 side. The other side is configured to be occluded. And the hot water mixing valve 28 operates, and the hot water from the water storage tank 10 and the water from the water supply pipe 18 open | release on the tapping pipe 17 side, and the opening degree on the water supply pipe 18 side. Are mixed in proportion according to.

The tapping pipe 17 between the hot water mixing valve 28 and the upstream end of the tapping bypass pipe 20 is provided with a mixing thermistor 29 and the tapping pipe 17 at the downstream end of the tapping bypass pipe 20. ) Is provided with a hot water supply outlet thermistor 30 that detects the temperature of the hot water toward the tap of the tap.

In the upper position of the water storage tank 10, the water storage thermistor 31 which detects the temperature of the hot water stored in the water storage tank 10 is provided. In addition, an intermediate thermistor 32 is provided at a lower position of the water storage tank 10 at a predetermined distance from the water storage thermistor 31. The hot water thermistor 31 and the intermediate thermistor 32 constitute the hot water break detection means of the present invention.

The tank controller 16 is connected to the tank thermostat 31 and the intermediate thermistor 32. The tank controller 16 is connected to the tank thermostat 30 and the tank circulation path 11, Water mixing valve 28 and the bypass valve 21 on the basis of the temperature detected by the thermistor 14 of the water supply pipe 18 and the water flow rate of the water supply pipe 18 detected by the water quantity sensor 23 And sends a signal for prohibiting heating or a signal for permitting heating to the combustion hot water supply device 3.

In addition, the tank controller 16 includes a plurality of operation switches (not shown) such as temperature switches for setting a desired hot water temperature (temperature of hot water supplied from taps such as taps and showers) according to the user's operation. The remote control 33 (hot water temperature setting means) provided with this is connected.

Here, the state of the hot water filled in the storage tank 10 will be described, the tapping pipe 17 is connected to the upper portion of the boiling water tank 10, the water supply pipe 18 is connected to the lower portion of the boiling water tank 10. Therefore, when hot water of the storage tank 10 is hot water is used, hot water is drawn from the tapping pipe 17 and the hot water of the storage tank 10 is reduced from the water supply pipe 18 at the lower portion of the storage tank 10. Water is supplied. As a result, in the water storage tank 10, a hot water layer of high temperature is formed at the top, and a low temperature water layer is formed at the bottom. In addition, since the hot water layer and the water layer are in contact with each other up and down, an intermediate layer having a lower temperature than the hot water layer and a higher temperature than the water layer is formed at the contact portion between the hot water layer and the water layer. The temperature of an intermediate | middle layer becomes low gradually from the part which contact | connects a hot water layer to the part which contact | connects a water layer.

When the hot water layer of the water storage tank 10 decreases, the temperature near the outlet of the water storage tank 10 to which the tapping pipe 17 is connected will become low. And when hot water of predetermined temperature is no longer obtained from the water storage tank 10, it will be in the state generally called hot water disconnection. In other words, when hot water is cut off in the water storage tank 10, hot water having a low temperature is derived from the water storage tank 10.

The hot water disconnected state can be determined by the detected temperature of the water storage thermistor 31. In addition, the remaining amount of the warm water layer in the storage tank 10 can be predicted by the detection temperature of the intermediate thermistor 32. That is, even if the hot water layer is confirmed by the detection temperature of the water storage thermistor 31, if the intermediate layer or the water layer is confirmed by the detection temperature of the intermediate thermistor 32, it can be determined that the hot water cutoff of the water storage tank 10 is near. When the hot water layer is confirmed by the detected temperature of the intermediate thermistor 32, it can be determined that sufficient hot water is stored in the storage tank 10.

The tank controller 16 performs mixing temperature regulation control and bypass temperature regulation control in accordance with the presence or absence of the warm water cutoff of the water storage tank 10. The mixing temperature regulating control controls the opening degree on the tapping pipe 17 side and the opening degree on the water supply pipe 18 side in the hot water mixing valve 28 to control the mixing thermistor 29 or the hot water supply outlet thermistor 30. The mixing ratio of the hot water from the boiling water tank 10 and the water from the water supply pipe 18 is adjusted so that the detected temperature of the hot water becomes the hot water set temperature set by the remote controller 33. Bypass temperature regulation control controls the opening degree of the bypass valve 21, and the combustion hot water heater 3 mentioned later so that the detected temperature of the hot water supply outlet thermistor 30 may become the hot water set temperature set by the remote control 33. Hot water with a low temperature from the tapping bypass pipe 20 is mixed with hot water with a high temperature heated by).

The combustion hot water heater 3 can employ | adopt a thing with a well-known structure as instantaneous heating type. That is, the combustion hot water heater 3 includes a hot water heater circuit 19 (constituting a part of the hot water pipe 17) connected to the hot water pipe 17, and a hot water heater controller 42 configured by a microcomputer or the like. . The hot water heater controller 42 is connected to the tank controller 16 so that communication is possible. The tank controller 16 and the hot water heater controller 42 constitute the hot water supply control means of the present invention.

The hot water heater circuit 19 is provided with a burner 44 for heating the heat exchanger 43, the heat exchanger 43, and a hot water bypass tube 45 for bypassing the heat exchanger 43. On the downstream side of 19, a hot water filling pipe 46 branching from the hot water heater circuit 19 and extending to a bathtub (not shown) is connected.

The hot water heater circuit 19 is supplied to the bypass servo 47 and the combustion hot water heater 3 which change the distribution ratio of the flow rate of the hot water to the heat exchanger 43 and the flow rate of the hot water to the hot water bypass pipe 45. The water quantity servo 48 which is a throttle valve which regulates the flow volume of hot water to be used is provided.

In addition, the hot water heater circuit 19 flows to the downstream side of the hot water heater flow rate sensor 49 and the hot water supply bypass pipe 45 for detecting the flow rate of the hot water supplied to the heat exchanger 43 and the hot water bypass tube 45. The hot water heater thermistor 50 which detects the temperature of hot water is provided.

Moreover, the hot water filling pipe 46 is provided with the hot water filling flow rate sensor 51 which detects the flow volume of the hot water filling pipe 46, and the hot water filling valve 52 which opens and closes the hot water filling pipe 46. FIG. .

The water heater controller 42 includes a temperature detection signal by the water heater thermistor 50, a detection signal of the water flow rate by the hot water heater flow rate sensor 49, and a detection signal of the water flow rate by the hot water filling flow rate sensor 51. Is input. In addition, the operation of the bypass servo 47, the water supply servo 48, the burner 44, and the hot water filling valve 52 is controlled by the control signal output from the water heater controller 42.

The hot water heater controller 42 enters the heating permission state when the hot water controller 42 receives a signal indicating the heating permission from the tank controller 16. And when the water flow rate more than a predetermined | prescribed minimum flow volume is detected by the hot water heater flow sensor 49, the heating temperature regulation control which controls the combustion amount of the burner 44 so that the detection temperature of the hot water heater thermistor 50 may become a target hot water temperature. Run Moreover, when receiving the signal which instruct | indicates a heating prohibition from the tank controller 16, it will be in a heating prohibition state and execution of heating temperature regulation control is prohibited.

In the heating temperature control control by the hot water heater controller 42, the first hot water heater operation control and the second hot water heater operation control are selectively executed. The first hot water heater operation control controls the operation of the combustion hot water heater 3 using a temperature higher than the hot water supply set temperature as the target heating temperature.

Here, the operation | movement which concerns on the summary of this invention by the tank controller 16 and the hot water heater controller 42 is demonstrated with reference to the flowchart of FIGS.

2 to 4 show the operation of the tank controller 16. When the power supply of the tank unit 2 is turned ON in STEP1 of FIG. 2, it progresses to STEP2, and the tank controller 16 transmits a signal which instruct | indicates a heating prohibition to the water heater controller 42, and by this the combustion hot water heater ( Execution of the heating temperature regulation control by 3) is prohibited. The control proceeds to STEP3 to make the bypass valve 21 fully open and proceeds to STEP4 to stop the mixing temperature control by the water blending valve 28. [

In the following STEP5, the tank controller 16 determines whether the water supply water between the downstream end of the tapping bypass pipe 20 and the tapping pipe 17 on the downstream side of the combustion hot water heater 3 (see FIG. 1) is radiated. If it judges that it is heat dissipation, it progresses to STEP6 and makes the bypass valve 21 fully open. In addition, if it is not radiated, it progresses to STEP7 and the bypass valve 21 is made to be stopped in the opening degree just before the water | fever after the bypass temperature regulation control.

When bypass temperature regulation control is performed and water | cooled, comparatively high temperature hot water may remain between the downstream end of the tapping bypass pipe 20, and the tapping pipe 17 of the downstream side of the combustion hot water heater 3. The determination of the heat dissipation in STEP5 is performed according to whether the time required for heat dissipation of the high temperature hot water remaining in the tapping tube 17 has elapsed.

Next, the tank controller 16 determines the presence or absence of water flow in STEP8. In STEP 8, it is assumed that water is detected when the flow rate of the lower flow rate is detected by the outflow amount sensor 22 and the flow rate sensor 23. If no water is passed in STEP 8, the flow advances to STEP 9, and in STEP 9, if no hot water filling instruction is given by the remote controller 33, the flow returns to STEP 8. When the hot water filling instruction is given in STEP 9, the flow proceeds to STEP 21 in FIG. 3, which will be described later.

When water flow is detected in STEP8 of FIG. 2, it progresses to STEP10 and it determines whether the hot water cut | disconnects in the storage tank 10. Judgment of the presence or absence of the warm water cut-off of the storage tank 10 in STEP10 is based on the detection temperature of the intermediate thermistor 32, and a predetermined amount of residual water in the storage tank 10 (for example, 12 liters) Or not). If the amount of water is equal to or greater than the predetermined amount of water remaining, the process proceeds to STEP 11 without the hot water remaining. If the amount of water is less than the predetermined amount of water remaining, the process proceeds to STEP 17 as the hot water is broken or the hot water may be broken in a short time.

When it progresses to STEP11, the tank controller 16 transmits the signal which instruct | indicates a heating prohibition to the water heater controller 42, and progresses to STEP12 and makes the bypass valve 21 fully open. Then, the flow advances to STEP13 to perform mixing temperature regulation control. In mixing temperature control control, the tank controller 16 controls the opening degree of the hot water supply pipe 17 side (hot water side) and the water supply pipe 18 side (water side) of the hot water mixing valve 28, and the hot water supply thermistor The mixing ratio of the hot water in the hot water supply pipe 17 and the water in the water supply pipe 18 is adjusted so that the detected temperature at 30 is the hot water set temperature set by the remote controller 33.

Next, in step 14, the tank controller 16 determines whether the hot water tank is disconnected from the hot water tank 10 based on the detected temperature of the hot water thermistor 31. When the hot water cut-off has occurred in the storage tank 10, it progresses to STEP17, and when the hot water cut-off has not arisen in the storage tank 10, it progresses to STEP15.

In STEP15, it is determined whether there is a hot water error in the tank unit 2 (failure of components such as sensors and valves). When no hot water error occurs in the tank unit 2, the tank controller 16 proceeds to STEP 16. When a hot water error has occurred in the tank unit 2, it progresses to STEP29 of FIG. 4, This is mentioned later.

In STEP16 of FIG. 2, if the water flow rate sensor 22 and the water quantity sensor 23 pass water at or below the lower limit flow rate, the flow returns to STEP 5, and when not, the flow returns to STEP 12. That is, the tank controller 16 repeats STEP12-STEP16 until it reaches a still state.

Moreover, the tank controller 16 advances to STEP17 when the hot water cut | disconnects in the water storage tank 10 in STEP10 or STEP14. In STEP17, the tank controller 16 transmits a signal instructing heating permission to the hot water heater controller 42, and proceeds to STEP18. Although the water heater controller 42 which received this signal combusts the burner 44 and starts heating temperature control control, this is mentioned later.

When it progresses to STEP18, the tank controller 16 performs bypass temperature regulation control. Bypass temperature control control adjusts the opening degree of the bypass valve 21 so that the detection temperature of the hot water supply outlet thermistor 30 may be set to the hot water setting temperature set by the remote controller 33, and the combustion hot water heater 3 is heated. The hot water of the hot water of the tapping pipe 17 is mixed with the hot water of the tapping water from the tapping bypass pipe 20. At this time, since the hot water from the tapping bypass pipe 20 joins the tap water passing through the combustion hot water heater 3, even if pressure loss occurs in the tap water passing through the combustion hot water heater 3, the downstream end of the tapping bypass pipe 20 is caused. In addition, in the tapping pipe 17 on the downstream side, generation of pressure loss is reduced.

And when the hot water supply error does not generate | occur | produce in the tank unit 2 in STEP19, when the water flow rate sensor 22 and the water quantity sensor 23 enter the exponential state in which water flow more than a lower limit flow rate is not detected by STEP20. Execution of the bypass temperature regulation control is continued until STEP18. When it reaches the exponential state, it returns from STEP20 to STEP5. When the hot water supply error of the tank unit 2 occurs in step 19, the process proceeds to step 29 of FIG.

Here, the operation of the water heater controller 42 will be described with reference to FIG. 5. In step 39 of FIG. 5, when the power supply of the combustion hot water heater 3 is turned on, the flow proceeds to step 40. The power supply of the combustion hot water heater 3 is turned ON in conjunction with the tank unit 2. When it progresses to STEP40, the hot water heater controller 42 will stop the combustion of the burner 44 until it becomes a water flow state in the following STEP41. In STEP 41, it is assumed that water flow is greater than or equal to the lower limit flow rate by the hot water heater flow rate sensor 49.

If it is determined that the water is passed in STEP 41, the water heater controller 42 proceeds to STEP 42 and repeats STEP 40 to STEP 42 until it receives a signal instructing the heating permission from the tank controller 16 (when heating is prohibited). do.

The hot water heater controller 42 proceeds from STEP42 to STEP43 when receiving the signal instructing heating permission from the tank controller 16. As described above, when the tank controller 16 transmits a signal instructing heating permission to the hot water heater controller 42, the tank controller 16 performs bypass temperature control control (Step 18 in FIG. 2).

In STEP43, it is determined whether the detected water quantity of the hot water heater flow rate sensor 49 is 12 liters / minute or more. In this embodiment, the flow volume (water supply amount to the combustion hot water heater 3) of hot water which a pressure loss generate | occur | produces in the hot water supply pipe 17 on the combustion hot water heater 3 side is 12 liter / min or more. Therefore, in STEP43, it is judged whether the pressure loss generate | occur | produces in the hot water supply pipe 17 of the combustion hot water heater 3 side. In addition, the quantity used for determination in STEP43 is previously set according to the length of the tapping-out pipe 17 of the combustion hot water heater 3 side, the component mounted in the tapping pipe 17, etc.

When the water supply amount is more than 12 liters / minute in step 43 (when a pressure loss occurs), the water heater controller 42 burns the burner 44 in STEP 44 and sets the hot water supply set by the remote controller 33 in STEP 45. The 1st hot water heater operation control which controls operation | movement of the combustion hot water heater 3 is performed using predetermined temperature higher than temperature as a target heating temperature. In addition, in this embodiment, the target heating temperature used by the 1st hot water heater operation control is set to 55 degreeC as an upper limit.

By doing so, the hot water of the hot water of the tapping pipe 17 heated by the combustion hot water heater 3 is mixed with the low temperature hot water from the tapping bypass pipe 20 by the bypass temperature regulation control, and is discharged relatively. The pressure loss in the water pipe 17 is reduced.

On the other hand, when the water supply amount is less than 12 liters / minute in STEP43 (when the occurrence of pressure loss is small), the water heater controller 42 burns the burner 44 in STEP46, and the remote controller 33 in STEP47. The second hot water heater operation control for controlling the operation of the combustion hot water heater 3 is performed by setting the set hot water setting temperature as the target heating temperature. According to this, heating of the hot water by combustion of the burner 44 of the combustion hot water heater 3 can be performed efficiently.

Here, by the judgment of STEP43, when the operation of the combustion hot water heater 3 is changed from one of the first hot water heater operation control and the second hot water heater operation control to the other side, if the target heating temperature changes rapidly, the bypass temperature There is a possibility that the opening and closing operation of the bypass valve 21 under the regulation control cannot be followed. Therefore, in the present embodiment, when changing from one of the first hot water heater operation control to the second hot water heater operation control to the other side, the target heating temperature of the combustion hot water heater 3 is slowly changed to open and close the bypass valve 21. The operation follows the temperature change of the hot water by the heating on the combustion hot water heater 3 side, so that bypass temperature regulation control is performed reliably.

Then, the water heater controller 42 repeats the steps from STEP42 to STEP48 until the water supply controller 42 has an exponent (the water supply flow rate sensor 49 no longer detects the flow rate more than the lower limit flow rate), and the water supply controller 42 has the water supply at STEP48. Is returned, the process returns to STEP40.

Next, the case where hot water filling instruction is given in STEP9 of FIG. 2 is demonstrated with reference to FIG. The operation of FIG. 3 in the tank controller 16 is performed at the initial stage of the hot water filling operation by opening the hot water filling valve 52, and the tapping pipe 17 on the downstream side of the hot water filling tube 46 is located downstream. The hot water remaining in the) is counterflowed and introduced into the hot water filling pipe 46.

When it progresses from STEP9 of FIG. 2 to STEP21 of FIG. 3, the tank controller 16 opens the hot water filling valve 52 of the combustion hot water heater 3 via the hot water heater controller 42. FIG. Subsequently, when it progresses to STEP22, the tank controller 16 permits or prohibits heating with respect to the water heater controller 42. FIG. That is, the tank controller 16 does not transmit a signal indicating a heating permission to the hot water heater controller 42 (heating prohibition) when no hot water break occurs in the water storage tank 10 (heating prohibition). The hot water from is sent to the bathtub through the hot water filling pipe 46. When hot water cutout occurs in the storage tank 10, a signal indicating a heating permission for the hot water heater controller 42 is transmitted, and the hot water heated by the combustion hot water heater 3 is bathed through the hot water filling pipe 46. Send to

In step 23, it is determined whether or not the hot water remaining in the tapping pipe 17 on the downstream side from the upstream end of the hot water filling pipe 46 is drained from the hot water filling pipe 46 toward the bath. In this embodiment, in this embodiment, the hot water filling pipe which stays in the tapping pipe 17 of the downstream side rather than the upstream end of the hot water filling pipe 46 from a time point which opened the hot water filling valve 52 is opened. It is time to escape from (46), and it is set as drainage completion in the case of about 20 second) passing in this embodiment. In addition, the time used at this time is set according to the length (capacity) of the tapping pipe 17 between the upstream end of the hot water filling pipe 46 and the downstream end of the tapping bypass pipe 20.

When the drainage is completed in STEP23, the tank controller 16 proceeds to STEP24 to close the bypass valve 21, and the drainage is not completed (the hot water is likely to remain in the tapping pipe 17). If there is, the process proceeds to STEP25, whereby the bypass valve 21 is stopped by the opening temperature just before the index by the last bypass temperature regulation control. By providing STEP25, the flow of hot water is allowed through the tapping bypass pipe 20, and the tap water can be smoothly flowed from the downstream end of the tapping bypass pipe 20 toward the hot water filling pipe 46.

After passing through STEP24 or STEP25, if no water flow from the tap or the like is detected in STEP26, and the hot water filling request is not eliminated by the completion of the hot water filling in the bath in STEP27, the flow returns to STEP22 and the hot water filling operation is continued. The water flow from the faucet or the like is detected when the difference between the total flow rate detected by the tapping water sensor 22 and the water quantity sensor 23 and the flow rate detected by the hot water filling flow rate sensor 51 are equal to or greater than a predetermined flow rate. do.

When water flow from the tap or the like is detected in STEP26, or when the hot water filling is no longer required by the completion of the hot water filling in the bathtub in STEP27, the tank controller 16 proceeds to STEP28 to operate the water heater controller 42. Through this, the hot water filling valve 52 is closed, thereby stopping the hot water filling operation and returning to STEP5 of FIG. 2.

In this way, since hot water can be discharged from the tapping pipe 17 by using the hot water filling operation, hot water can be prevented from tapping unexpectedly.

Next, the case where the hot water error (fault of components, such as sensors and valves) in the tank unit 2 occurred in STEP15 or STEP19 of FIG. 2 is demonstrated with reference to FIG. The operation of FIG. 4 in the tank controller 16 is higher upstream than the downstream end of the tapping bypass pipe 20 when the mixing temperature adjustment control using the hot water of the boiling water tank 10 is temporarily unable to be performed. In order to prevent the situation where the comparatively high temperature hot water which stays in the tapping pipe 17 of a tap is unexpectedly tapped out from a tap etc., it is provided.

When it progresses from STEP15 or STEP19 of FIG. 2 to STEP29 of FIG. 4, since the hot water supply from the water storage tank 10 cannot be performed, the tank controller 16 shows heating permission with respect to the water heater controller 42. FIG. Send the signal. Next, it progresses to STEP30, and the tank controller 16 closes the hot water supply pipe 17 side (hot water side) of the hot water mixing valve 28, and opens the water supply pipe 18 side (water side). As a result, the tapping pipe 17 is in a state capable of flowing water from the water supply pipe 18.

Subsequently, when water flow is detected by the detected flow rates of the hot water amount sensor 22 and the water quantity sensor 23 in STEP31, operation of the combustion hot water heater 3 (combustion of the burner 44) is started, and the tank controller 16 is started. ) Proceeds to STEP32. In step 32, when the hot water remaining in the tapping pipe 17 on the upstream side of the tapping bypass pipe 20 is drained, the hot water is not likely to tap out from the faucet or the like. Pass valve 21 is completely closed. On the other hand, if it is determined in STEP 32 that the high-temperature hot water staying in the outlet pipe 17 upstream of the downstream end of the tapping bypass pipe 20 has not been drained, the process proceeds to STEP 34 where the bypass valve 21 And stopped at the opening just before the exponent after the bypass temperature control. As a result, the water from the water supply pipe 18 is mixed through the tapping bypass pipe 20 to the hot water of the hot water remaining in the tapping pipe 17 on the upstream side of the tapping bypass pipe 20. It is possible to prevent a situation where hot water is spouted out from the tap or the like.

And the tank controller 16 advances to STEP35, and when the hot water error in the tank unit 2 is canceled, it returns to STEP5 of FIG. 2 and the hot water error in the tank unit 2 was not canceled. In the case, the process returns to STEP31 in FIG.

In addition, when water flow is not detected in STEP31, the tank controller 16 advances to STEP36. In step 36, when the hot water remaining in the tapping pipe 17 located upstream from the downstream end of the tapping bypass pipe 20 is heat-dissipated, the hot water is not likely to be tapped out from the faucet or the like. Pass valve 21 is completely closed. On the other hand, in step 36, when the hot water of the hot water which stays in the tapping pipe 17 of an upstream rather than the downstream end of the tapping bypass pipe 20 does not radiate heat, it progresses to STEP38 and the bypass valve 21 is opened. It is set as the state which stopped at the opening degree just before the exponent after bypass temperature regulation control. As a result, the water from the water supply pipe 18 is mixed through the tapping bypass pipe 20 with the hot hot water remaining in the tapping pipe 17 on the upstream side of the tapping bypass pipe 20 rather than the downstream end thereof. Possible state, that is, a state where hot water is spouted from the tap or the like is prevented.

And the tank controller 16 advances to STEP35, and when the hot water error in the tank unit 2 is canceled, it returns to STEP5 of FIG. 2 and the hot water error in the tank unit 2 was not canceled. In the case, the process returns to STEP31 in FIG.

3-combustion hot water heater 9-heat pump (heating means)
10-Storage tank 16-Tank controller (water supply control means)
17-Hot water pipe 18-Water pipe
20-tapping bypass tube 21-bypass valve
28-hot water mixing valve (mixing ratio change means)
31-Hot water thermistor (meaning hot water detection means)
32-intermediate thermistor (meaning hot water detection means)
33-remote control (hot water temperature setting means)
42 - Hot water heater controller (hot water supply control means)
46-Hot Water Filling Pipe 52-Hot Water Filling Valve

Claims (5)

A storage tank,
Heating means for heating and generating hot water stored in a storage tank,
Hot water pipe which draws water from the tank,
A water supply pipe connected to the storage tank and the tapping pipe,
Mixing ratio changing means for changing the mixing ratio of the hot water of the tapping pipe drawn from the storage tank and the water supplied from the water supply pipe to the tapping pipe,
Hot water break detection means for detecting hot water break in the storage tank,
Combustion hot water heater which is installed in the middle of tapping pipe on the downstream side than tapping pipe and tapping pipe and heats hot water of tapping pipe with burner,
A tapping bypass pipe which bypasses the combustion hot water heater and allows the tapping pipe to pass through the upstream and downstream sides of the combustion hot water heater;
Bypass valve which opens and closes tapping bypass pipe,
Hot water supply temperature setting means which sets the hot water supply temperature obtained from the exit of a hot water supply pipe,
If the hot water cut-out of the storage tank is not detected by the hot water cut-out detection means, the mixing valve is controlled to adjust the mixing ratio by the mixing ratio changing means so that the bypass valve is opened to obtain hot water of the hot water set temperature. And a hot water supply control means for performing a heating and temperature control control for heating the hot water of the hot water supply pipe by a combustion hot water heater so that hot water having a hot water set temperature is obtained when hot water breakage of the hot water tank is detected by the hot water break detection means. In the hot water supply system,
The hot water supply control means adjusts the opening degree of the bypass valve so that hot water of the hot water setting temperature is obtained when the heating temperature adjustment control is performed, and the hot water from the hot water supply bypass pipe is supplied to the hot water of the hot water pipe on the downstream side of the combustion hot water heater. A hot water supply system, characterized by enabling bypass temperature regulation control to be mixed.
The method according to claim 1,
The hot water supply control means targets the first hot water heater operation control for controlling the operation of the combustion hot water heater by setting a predetermined temperature higher than the hot water setting temperature as a target heating temperature when performing the bypass temperature regulation control, and the hot water supply setting temperature. And a second hot water heater operation control for controlling the operation of the combustion hot water heater as the heating temperature.
The method according to claim 2,
The hot water supply control means is a target in the first hot water heater operation control at a speed at which the opening and closing operation of the bypass valve can be followed when the first hot water heater operation control and the second hot water heater operation control are changed from one side to the other. The hot water supply system, which gradually changes the heating temperature and the target heating temperature in the second hot water heater operation control from one side to the other.
The method according to any one of claims 1 to 3,
The hot water supply control means taps the bypass valve until the first predetermined time elapses from the time of the tapping stop when the tapping from the outlet of the tapping pipe stops when the bypass temperature regulating control is executed. If the tapping from the outlet of the tapping pipe is resumed within the first predetermined time while the tapping from the exit of the tapping stops, and the tapping is resumed within the first predetermined time, the tapping is performed until the second predetermined time elapses from the start of tapping. The pass valve is kept at the opening degree just before the tapping from the outlet of the tapping tube is stopped,
The first predetermined time is set in advance on the basis of the required time until the hot water falls in the tapping pipe downstream of the combustion hot water heater and in the tapping pipe on the upstream side from the downstream end of the tapping bypass pipe by a heat dissipation. There is,
The second predetermined time is set in advance on the basis of the required time that the hot water in the tapping pipe discharged from the outlet of the tapping pipe is discharged from the outlet of the tapping pipe downstream from the downstream end of the tapping bypass pipe and upstream of the tapping bypass pipe. . The method of claim 4,
And a hot water filling tube for connecting the hot water filling tube and the bathtub to the hot water filling pipe downstream from the downstream end of the tapping bypass pipe and filling the tub with hot water, and a hot water filling valve for opening and closing the hot water filling pipe. The hot water supply control means is capable of performing hot water filling control for supplying hot water to the bathtub by opening the hot water filling valve at the time of stopping tapping from the outlet of the tapping pipe.
When the hot water supply control means performs hot water filling control within the first predetermined time, tapping of the bypass valve from the outlet of the tapping pipe is stopped until the third predetermined time elapses from the opening of the hot water filling valve. It is kept at the opening degree just before becoming, and after a 3rd predetermined time elapses, a bypass valve is closed,
The hot water supply system is set in advance based on the required time for the hot water in the hot water supply pipe to be discharged into the hot water filling pipe downstream of the combustion hot water heater and upstream from the downstream end of the hot water bypass pipe.

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