JP4780644B2 - Hot water supply device connection unit, control method and program for hot water supply device connection unit - Google Patents

Description

  The present invention relates to a hot water supply device connection unit that mixes hot water supplied from a hot water supply device such as a solar water heater with cold water and sends it to an auxiliary heat source device, and more particularly to an apparatus and method for detecting blockage of a hot water supply device.

  Hot water supply devices such as solar water heaters that use solar heat or water heaters that use the exhaust heat of heat engines and air conditioners are widespread in many facilities regardless of consumer use. However, since the amount of solar radiation varies depending on the season and weather, there may be cases where the necessary amount of heat cannot be obtained by solar heat alone. In addition, since the exhaust heat of the heat engine or the like varies depending on the load of the heat engine or the like, there may be a case where the required amount of heat cannot be obtained only with the exhaust heat. Therefore, when the hot water supply device is connected to an auxiliary heat source device that uses gas, kerosene, electric heat, etc., and the necessary amount of heat cannot be covered only by solar heat or exhaust heat, the shortage of heat is consumed by combustion heat or electric heat such as gas. A hot water supply system supplemented by the above has been put into practical use.

  In this hot water supply system, a hot water supply device and an auxiliary heat source machine are connected via a hot water supply device connection unit, and the hot water supply device connection unit includes a mixing valve, and supplies hot water and water supplied from the hot water supply device. Are mixed at an appropriate ratio and sent to the auxiliary heat source machine. If the temperature of the hot water supplied from the hot water supply device is higher than the target hot water temperature set in the auxiliary heat source unit, mix the hot water supplied from the hot water supply device and tap water to prepare the mixed water at the hot water target temperature. To the auxiliary heat source machine (in this case, it is not necessary to operate the auxiliary heat source machine). In addition, when the temperature of the hot water supplied from the hot water supply device is lower than the target temperature for hot water supply, the hot water supplied from the hot water supply device is not added to the hot water, or is mixed with the hot water and sent to the auxiliary heat source machine. Then, it is heated to the hot water target temperature with the auxiliary heat source machine. Note that clean water is added to warm water that is lower than the target hot water temperature when there is no difference between the hot water supplied from the hot water supply device and the target hot water temperature that corresponds to the minimum output of the auxiliary heat source unit. This is to make it possible to operate the auxiliary heat source machine.

  In such a hot water supply system, for example, in the winter season when the temperature drops, the hot water in the hot water supply device may freeze, and the hot water supply from the hot water supply device side may stop. When the hot water supply system is operated in a state where hot water supply from the hot water supply device is stopped, the hot water supply from the hot water supply system may cause hunting.

  That is, when the hot water supply system starts the hot water supply operation, the mixing valve is at the position of 100% opening on the water supply side (0% opening on the hot water side), but the temperature of the mixing water delivered by the mixing valve is desired. In order to raise the temperature, control is performed to open the hot water side valve and close the water side valve. However, in the state where the hot water supply from the hot water supply device is stopped, even if the hot water side valve is opened, the hot water is not supplied and only the amount of cold water supplied from the clean water is reduced. Does not rise. For this reason, control is performed so that the warm water side valve of the mixing valve is further opened and the water supply side valve is further closed, and finally water supply from the mixing valve is stopped. Thereafter, the mixing valve once returns to the initial state (100% on the water side, 0% on the hot water side) and repeats the above control operation. For this reason, hot water supply becomes intermittent.

  In order to solve such a problem, in Patent Document 1, the amount of water discharged from the mixing valve is monitored, and when the variation in the amount of discharged water is repeated, the supply of hot water from the hot water supply device is stopped. Is disclosed.

Further, in Patent Document 2, the hot water supply device is connected to the hot water supply device based on the temperature of the hot water sent from the hot water supply device connection unit and the temperature of the clean water when the mixing valve is performing the hunting operation. It is determined whether or not hot water cannot be sent to the unit, and if it is determined that hot water cannot be sent from the hot water supply device to the hot water supply device connection unit, the hot water side of the mixing valve is There has been proposed a hot water supply system that is forcibly fully closed.
Japanese Patent No. 3465534 JP 2003-42541 A

  The inventions of Patent Literature 1 and Patent Literature 2 determine whether or not to stop supplying hot water from the hot water supply device with the occurrence of hunting as a starting point. Moreover, the occurrence of hunting is recognized by repeating the cycle of water supply from the hot water supply device connection unit and water supply stop twice. That is, since hunting is repeated at least twice until hunting is stopped, there is a problem that the user feels uncomfortable. In addition, when hunting occurs, the auxiliary heat source device cannot follow the decrease in water supply from the hot water supply device connection unit, and there is a risk that hot hot water is discharged from the hot water tap.

  The present invention has been made to solve such a problem, and a hot water supply device connection unit including a mixing valve for preparing cold water and hot water supplied from a hot water supply device to prepare mixed water of a desired temperature. Provides a hot water supply device connection unit that detects that the hot water supply device is in a state in which hot water cannot be delivered and prevents the occurrence of hunting by forcing the hot water side of the mixing valve to be fully closed, and a control method therefor The purpose is to do.

The first configuration of the hot water supply device connection unit according to the present invention is a mixing valve for preparing cold water and hot water supplied from the hot water supply device at an appropriate ratio to prepare mixed water at a desired temperature, and the cold water A cold water supply pipe for supplying the mixing valve to the mixing valve, a hot water supply pipe for supplying the hot water to the mixing valve,
A mixed water delivery pipe for delivering the mixed water from the mixing valve to an auxiliary heat source device; a bypass pipe for bypassing the cold water from the cold water supply pipe to the mixed water delivery pipe; A bypass valve that opens and closes, a flow rate detection means that detects a flow rate of the mixed water discharged from the mixed water delivery pipe, a temperature detection means that detects a temperature of the mixed water, and the opening and closing of the mixing valve and the bypass valve In the hot water supply device connecting unit comprising a control device that controls the control device, the control device detects the flow rate detected by the flow rate detection means and the first threshold value when the mixing valve is operated in a direction to increase the ratio of the hot water. First mixing means for comparing the flow rate; mixing valve stopping means for stopping the operation of changing the opening of the mixing valve when the detected flow rate of the flow rate detecting means is lower than the first threshold value; A bypass valve opening means for opening the bypass valve when the operation is stopped; and a detected flow rate of the flow rate detecting means and a second larger than the first threshold value when the bypass valve is opened. When the detected flow rate of the flow rate detection means is equal to or greater than the second threshold value, the cold water side valve of the mixing valve is fully opened and the hot water side valve is fully closed. The flow rate comparison means is provided.

  If the flow rate of the mixed water decreases and falls below the first threshold while the mixing valve is operated in the direction of increasing the ratio of the hot water, there is an abnormality in the supply of hot water or the hot water tap of the auxiliary heat source machine is throttled. In such a case, if the bypass valve is opened and the flow rate of the mixed water increases, it may be estimated that there is an abnormality in the supply of hot water instead of the hot water tap. it can. According to this configuration, when it is determined based on the above logic that the hot water supply device is in a hot water delivery impossible state, the mixing valve is fixed in a state where the cold water side valve is fully opened and the hot water side valve is fully closed. Therefore, the flow rate of the mixed water sent from the mixing valve does not fluctuate. That is, hunting does not occur.

  The hot water supply device is not limited to the solar water heater. A hot water supply device that uses exhaust heat from a fuel cell or a gas engine in a cogeneration system is also included in the hot water supply device referred to herein. Further, the hot water delivery impossible state refers to a state in which hot water is not discharged from the hot water supply device. For example, when hot water is not discharged from the hot water supply device due to freezing of hot water in the hot water supply device, contamination of foreign matter into the hot water supply device, stoppage of raw water supply to the hot water supply device, etc., the hot water supply device is It is said that the hot water cannot be delivered.

According to a second configuration of the hot water supply device connecting unit according to the present invention, in the first configuration, the bypass valve opening means is within a predetermined time after the operation of the mixing valve is stopped by the mixing valve stopping means . Further, the detected flow rate of the flow rate detecting means exceeds a third threshold value that is smaller than the first threshold value for determining that the hot water tap connected downstream of the mixing valve is in the process of closing or closing, and The bypass valve is opened when a state below the first threshold is continued.

  According to this configuration, when the flow rate of the mixed water detected by the flow rate detection means falls below the third threshold within a predetermined time after the operation of the mixing valve is stopped, the hot water supply is stopped after the operation of the mixing valve is stopped. Assuming that the stopper is closed, the subsequent processing can be stopped without opening the bypass valve.

  A third configuration of the hot water supply device connection unit according to the present invention is that, in the first or second configuration, the second flow rate comparing means fully opens a cold water side valve of the mixing valve. The state in which the valve on the hot water side is fully closed is held for a predetermined time and then released.

  According to this configuration, when it is determined that the hot water supply device is in a state where hot water cannot be delivered, the state in which the mixing ratio of the mixing valve is fixed to 100% cold water is maintained for a predetermined time, and then released, so that the predetermined During this time, it is not necessary to determine whether the hot water can be delivered. Therefore, the operation of the hot water supply device connection unit can be speeded up. In addition, when the cause of the inability to send out the hot water is freezing of the hot water in the hot water supply device, the freezing is eliminated with the passage of time, so after the predetermined time has passed, the fixing of the mixing ratio is released and the normal operation is resumed. be able to.

  A fourth configuration of the hot water supply device connection unit according to the present invention includes a mixing valve for mixing cold water and hot water supplied from the hot water supply device at an appropriate ratio to prepare mixed water at a desired temperature, and the cold water A cold water supply pipe for supplying the mixed water to the mixing valve, a hot water supply pipe for supplying the hot water to the mixing valve, a mixed water delivery pipe for sending the mixed water from the mixing valve to an auxiliary heat source machine, and the cold water to the A bypass pipe that bypasses the mixing valve from the cold water supply pipe and sends it to the mixed water delivery pipe, a bypass valve that opens and closes the bypass pipe, and a flow rate that detects the flow rate of the mixed water discharged from the mixed water delivery pipe Detection means; cold water temperature detection means for detecting the temperature of the cold water; hot water temperature detection means for detecting the temperature of the hot water; mixed water temperature detection means for detecting the temperature of the mixed water; the mixing valve; Open bypass valve A hot water supply device connection unit comprising a control device for controlling the temperature of the hot water supply device connection unit, the ambient temperature inside the hot water supply device connection unit or an environment temperature detecting means for detecting the temperature of the installation environment of the hot water supply device connection unit. Is a valve on the cold water side of the mixing valve when the temperature detected by any of the environmental temperature detection means, the cold water temperature detection means, the hot water temperature detection means, or the mixed water temperature detection means falls below a predetermined temperature. And the warm water side valve is fixed in a fully closed state.

  According to this configuration, when any of the ambient temperature inside the hot water supply device connection unit, the installation environment temperature of the hot water supply device connection unit, the cold water temperature, the hot water temperature, or the mixed water temperature falls below a predetermined temperature, Since it is determined that the hot water in the hot water supply device is frozen and cannot be sent out, it is possible to prevent hunting with a simple device.

  A first configuration of a control method for a hot water supply device connection unit according to the present invention is a mixing valve that prepares mixed water at a desired temperature by mixing cold water and hot water supplied from the hot water supply device at an appropriate ratio; A cold water supply pipe for supplying the cold water to the mixing valve; a hot water supply pipe for supplying the hot water to the mixing valve; a mixed water delivery pipe for sending the mixed water from the mixing valve to an auxiliary heat source; and A bypass pipe that bypasses the mixing valve from the cold water supply pipe and sends it to the mixed water delivery pipe, a bypass valve that opens and closes the bypass pipe, and a flow rate of the mixed water discharged from the mixed water delivery pipe In the method for controlling a hot water supply device connecting unit, comprising: a flow rate detecting means for detecting; a temperature detecting means for detecting the temperature of the mixed water; and a control device for controlling opening and closing of the mixing valve and the bypass valve. A first flow rate comparing step of comparing a detected flow rate of the flow rate detecting means with a first threshold when operated in a direction to increase the ratio of the hot water; the detected flow rate of the flow rate detecting means is less than the first threshold value; A mixing valve stopping step for stopping the operation of changing the opening of the mixing valve when the mixing valve is below; a bypass valve opening step for opening the bypass valve when the operation of the mixing valve is stopped; and the bypass When the valve is opened, the detected flow rate of the flow rate detecting means is compared with a second threshold value that is greater than the first threshold value, and if the detected flow rate of the flow rate detecting means is greater than or equal to the second threshold value, A second flow rate comparing step of fully opening the cold water side valve of the mixing valve and fixing the warm water side valve to a fully closed state.

In a second configuration of the control method of the hot water supply device connection unit according to the present invention, in the first configuration, in the bypass valve opening step , within a predetermined time after the operation of the mixing valve is stopped, The detected flow rate of the flow rate detection means exceeds a third threshold value that is smaller than the first threshold value for determining that the hot water tap connected downstream of the mixing valve is in the process of closing or closing, and the first threshold value . When the state below the threshold value of 1 is continued, the bypass valve is opened.

  According to a third configuration of the control method of the hot water supply device connection unit according to the present invention, in the first or second configuration, the second flow rate comparison step is performed by using a cold water side valve of the mixing valve. A state in which the valve on the warm water side is fully closed is held for a predetermined time and then released.

  The 4th structure of the control method of the hot water supply apparatus connection unit which concerns on this invention is a mixing valve which mixes cold water and the hot water supplied from a hot water supply apparatus by a suitable ratio, and prepares mixed water of desired temperature, A cold water supply pipe for supplying the cold water to the mixing valve; a hot water supply pipe for supplying the hot water to the mixing valve; a mixed water delivery pipe for sending the mixed water from the mixing valve to an auxiliary heat source; and A bypass pipe that bypasses the mixing valve from the cold water supply pipe and sends it to the mixed water delivery pipe, a bypass valve that opens and closes the bypass pipe, and a flow rate of the mixed water discharged from the mixed water delivery pipe A flow rate detecting means for detecting, a cold water temperature detecting means for detecting the temperature of the cold water, a hot water temperature detecting means for detecting the temperature of the hot water, a mixed water temperature detecting means for detecting the temperature of the mixed water, and the mixing Valve and said buy In the control method of the hot water supply device connection unit comprising a control device for controlling the opening and closing of the valve, the ambient temperature detection means for detecting the ambient temperature inside the hot water supply device connection unit or the temperature of the installation environment of the hot water supply device connection unit When the temperature detected by any of the environmental temperature detection means, the cold water temperature detection means, the hot water temperature detection means, or the mixed water temperature detection means falls below a predetermined temperature, the cold water side of the mixing valve The valve is fully opened and the warm water side valve is fully closed.

  The program according to the present invention, when executed by a computer, causes the computer to function as a control device for any one of the first to fourth hot water supply device connection units.

  As described above, according to the present invention, it is possible to realize a hot water supply system in which hunting does not occur even when the hot water supply device is in a state in which hot water cannot be delivered.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a configuration diagram of a hot water supply system showing an embodiment of the present invention. This hot water supply system is a system in which the solar water heater 1 is used as a hot water supply device, and a hot water heater 4 using gas or kerosene as fuel is used as an auxiliary heat source device. The hot water supplied from the solar water heater 1 and the water supply pipe 2 The cold water supplied from the hot water supply device connecting unit 3 is mixed at an appropriate ratio to prepare mixed water having a desired temperature, and the mixed water is heated to the target hot water temperature by the hot water heater 4, and the faucet 5 and Supply to bathtub 6. In addition, the water supply pipe 2 that supplies raw water, which is the raw water of the hot water, to the solar water heater 1 and the pipe that supplies the hot water from the solar water heater 1 to the hot water supply device connection unit 3 are water-stopping respectively. Since the plugs 11 and 12 are provided, the solar water heater 1 can be disconnected from the hot water supply system by closing the stop cocks 11 and 12 when the solar water heater 1 is not used (for example, in severe winter season). .

  For convenience of explanation, the terms “hot water” and “cold water” are used, but the water temperature of “hot water” is not necessarily higher than the water temperature of “cold water”. The “hot water” supplied from the solar water heater 1 is obtained by heating the “cold water” supplied from the water supply pipe 2 with solar heat, and therefore generally has a higher water temperature than “cold water”. However, in the early morning of winter, for example, the “hot water” in the solar water heater 1 is cooled by cold air at night and is cooler than “cold water” supplied from a water pipe laid in the ground. There is a case.

  The hot water supply device connection unit 3 includes a cold water check valve 311, a pressure reducing valve 312, a cold water thermistor 313, a high temperature hot water prevention valve 314, a hot water check valve 321, a hot water thermistor 322, a mixing valve 331, and a mixed water flow rate. A sensor 332, a mixed water thermistor 333, a pump 334, an overpressure relief valve 335, and a control device 34 are provided.

  The cold water supplied from the water supply pipe 2 flows into the mixing valve 331 through the cold water check valve 311 and the pressure reducing valve 312. Hot water supplied from the solar water heater 1 flows into the mixing valve 331 through the hot water check valve 321, is mixed with the cold water to become mixed water, is pressurized by the pump 334, and is sent to the water heater 4. Is done.

  The temperature of the cold water is measured by a thermistor for cold water 313, and the temperature of the warm water is measured by a thermistor for hot water 322, respectively. The temperature of the mixed water that has exited the mixing valve 331 (hereinafter referred to as “mixed water temperature”) is measured by a thermistor 333 for mixed water. The control device 34 monitors the outputs of the cold water thermistor 313, the hot water thermistor 322, and the mixed water thermistor 333, and operates the mixing valve 331 so that the mixed water temperature becomes a desired value. Adjust the mixing ratio of warm water.

  The high temperature hot water prevention valve 314 is a bypass valve that bypasses the mixing valve 331 and flows the cold water to the pump 334. For example, the temperature of the hot water supplied from the solar water heater 1 suddenly rises, and the mixing valve 331 This is a safety device that prevents unexpectedly high-temperature mixed water from flowing into the water heater 4 when the operation cannot follow it.

  The overpressure relief valve 335 is a safety valve that is located between the pump 334 and the water heater 4 and opens when the pressure of the mixed water becomes excessive to prevent the pump 334 from being damaged.

  A remote controller 42 is connected to the water heater 4 via a remote control terminal block 41. The remote controller 42 instructs on / off of the water heater 4, temperature setting (hereinafter, the temperature set by the user with the remote controller 42 is simply referred to as “set temperature”), hot water filling of the bathtub 6, reheating, etc. It is an operating device. The remote control terminal block 41 is also connected to the control device 34 of the hot water supply device connection unit 3, and an operation signal sent from the remote control 42 to the water heater 4 is also received by the control device 34.

  Further, the water heater 4 warms the mixed water supplied from the hot water supply device connection unit 3 to a temperature set by the remote controller 42 and discharges it from the faucet 5 and supplies it to the bathtub 6 through the hot water pipe 61. (Water bathing). The hot water filling pipe 61 is provided with an open / close valve (not shown). Hereinafter, the on-off valve and the faucet 5 are collectively referred to as “hot water tap”.

  FIG. 2 is a control block diagram showing the configuration of the control device 34. 3 and 4 are flowcharts showing the operation of the control device 34. Here, it is related to the operation related to the present invention, that is, the operation of forcibly fully closing the hot water side of the mixing valve 331 by determining whether or not the solar water heater 1 is in a hot water delivery impossible state. Only the portion to be shown is shown. Since the part related to normal control, that is, the part related to the control for adjusting the mixing ratio of the mixing valve 331 so as to obtain mixed water at a desired temperature is already known, the description thereof is omitted.

  In FIG. 2, the control device 34 includes a first flow rate comparison unit 341, a mixing valve stop unit 342, a bypass valve opening unit 343, and a second flow rate comparison unit 344.

  The first flow rate comparing means 341 outputs the mixing ratio (the ratio of hot water and cold water) output by the mixing valve 331, the flow rate of the mixed water detected by the mixed water flow sensor 332, and the second flow rate comparing means 344. This is a control module that compares the flow rate of the mixed water detected by the mixed water flow rate sensor 332 with the second threshold value based on the non-delivery flag and outputs the result to the mixing valve stop means 342. Through step 4 (see FIG. 3) are executed.

(Step 1) If the transmission disable flag is in the “ON” state, the process proceeds to Step 2, and if it is in the “OFF” state, the process returns to the top of Step 1 and waits. The sending impossible flag will be described later.

(Step 2) If the flow rate of the mixed water detected by the mixed water flow rate sensor 332 exceeds 1.5 liters / minute (third threshold value), the process proceeds to Step 3, and 1.5 liters / minute (third If it is equal to or less than (threshold value), the process returns to the top of step 1. When it is 1.5 liters / minute (third threshold value) or less, it is considered that the hot-water tap is closed or in the process of closing, and therefore the processing of step 3 and subsequent steps is not performed.

(Step 3) If the mixing ratio of the mixing valve 331 is changing in the direction of increasing the hot water supplied from the solar water heater 1 (while the hot water ratio is increasing), proceed to Step 4, otherwise return to the top of Step 1 .

(Step 4) If the flow rate of the mixed water detected by the mixed water flow sensor 332 is less than 5.0 liters / minute (first threshold value), the process proceeds to Step 5; Return to. When the operation of increasing the mixing ratio of hot water is performed and the flow rate of the mixed water is less than the first threshold value, the solar water heater 1 is in a state in which hot water cannot be delivered (for example, in the piping of the solar water heater 1) This is because it is considered that the hot water is frozen.

  The mixing valve stop means 342 is activated when the flow rate of the mixed water detected by the mixed water flow rate sensor 332 in step 4 is less than 5.0 liters / minute (first threshold), and the mixing valve 331 is mixed. The control module stops the operation of changing the ratio, and executes the following steps 5 to 8 (see FIG. 3).

(Step 5) The operation of changing the mixing ratio of the mixing valve 331 is stopped, the mixing ratio is fixed, a timer is started, and the process proceeds to Step 6.

(Step 6) When the flow rate of the mixed water detected by the mixed water flow rate sensor 332 exceeds 1.5 liters / minute (third threshold value), the process proceeds to Step 7, and 1.5 liters / minute (third If it is equal to or less than (threshold), the process proceeds to step 15. If the mixing ratio of the mixing valve 331 is fixed, the flow rate immediately before the mixing ratio is fixed is maintained, but after the mixing ratio is fixed, the flow rate of the mixed water decreases to 1.5 liters / minute (third threshold value) or less. This is because it is considered that the operation of closing the hot-water tap after the mixture ratio is fixed is performed.

(Step 7) If the flow rate of the mixed water detected by the mixed water flow rate sensor 332 is less than 5.0 liters / minute (first threshold value), go to Step 8, otherwise go to Step 15. . If the flow rate of the mixed water increases (recovers) to 5.0 liters / minute (first threshold) or more, the cause of obstructing the hot water delivery of the solar water heater 1 is eliminated (for example, the piping in the solar water heater 1 is Therefore, the process proceeds to step 15 and returns to the normal control.

(Step 8) If the timer started in Step 5 (here, set to 4 seconds) has expired, the process proceeds to Step 9; otherwise, the process returns to the beginning of Step 6. That is, when the mixing ratio of the mixing valve 331 is fixed, the process proceeds to step 9 only when the hot water tap is not closed and the cause of obstructing the hot water delivery of the solar water heater 1 is not eliminated. .

  The bypass valve opening means 343 is a control module activated by step 8 and executes the following step 9 (see FIG. 3).

(Step 9) The high temperature hot water prevention valve (bypass valve) 314 is opened and a timer is started to proceed to Step 10.

  The second flow rate comparing means 344 is a control module activated by step 9 and executes the following steps 10 to 14 (see FIG. 3).

(Step 10) When the flow rate of the mixed water detected by the mixed water flow rate sensor 332 exceeds 1.5 liters / minute (third threshold value), the process proceeds to Step 11 and 1.5 liters / minute (third If it is equal to or less than (threshold), the process proceeds to step 15. This is because, similarly to step 6, when the flow rate of the mixed water is 1.5 liters / minute (third threshold value) or less, it is considered that the hot water tap is closed or in the process of closing.

(Step 11) When the flow rate of the mixed water detected by the mixed water flow rate sensor 332 is equal to or higher than 8.0 liters / minute (second threshold), the solar water heater 1 cannot send hot water for some reason. It judges that it is in a state, and proceeds to step 16. If it falls below 8.0 liters / minute (second threshold value), go to Step 12. The reason why the flow rate of the mixed water does not exceed the second threshold even when the high temperature hot water prevention valve 314 is opened is that it is not because of the abnormality of the solar water heater 1 but because the hot water tap is throttled.

(Step 12) If the timer started in Step 9 (here, set to 3 seconds) has expired, the process proceeds to Step 13; otherwise, the process returns to the beginning of Step 10. That is, the process proceeds to step 13 only when the hot water tap is not closed and the flow rate of the mixed water does not exceed the second threshold value within 3 seconds after opening the high temperature hot water prevention valve 314.

(Step 13) The high temperature hot water prevention valve 314 is closed and an operation for changing the mixing ratio of the mixing valve 331 is started, and the process proceeds to Step 14.

(Step 14) When the flow rate of the mixed water detected by the mixed water flow rate sensor 332 exceeds 1.5 liters / minute (the third threshold value), the process returns to the beginning of Step 14, and 1.5 liters / minute ( If it is equal to or less than (third threshold value), the process returns to the top of the loop. In other words, while the hot water from the hot water tap continues, the process stays at step 14, and when the hot water tap is closed, the process returns to the top of the loop and waits for the next opening of the hot water tap.

  In Step 6, Step 7 and Step 10, the flow rate of the mixed water detected by the mixed water flow sensor 332 is 1.5 liters / minute (third threshold value) or less, or 5.0 liters / minute (first step). If it is equal to or greater than (1 threshold value), the following step 15 (see FIG. 4) is executed by the mixing valve stop means 342 or the second flow rate comparison means 344.

(Step 15) The high temperature hot water prevention valve 314 is closed and an operation for changing the mixing ratio of the mixing valve 331 is started, and the process proceeds to the top of the loop. That is, it returns to normal control (control which adjusts the mixing ratio of the mixing valve 331 so that mixed water of desired temperature can be obtained).

  In Step 11, when the flow rate of the mixed water detected by the mixed water flow rate sensor 332 is equal to or higher than 8.0 liters / minute (second threshold), that is, the solar water heater 1 sends out hot water for some reason. If it is determined that the state is not possible, the second flow rate comparing means 344 executes the following steps 16 to 19 (see FIG. 4).

(Step 16) The high temperature hot water prevention valve 314 is closed and the mixing ratio of the mixing valve 331 is fixed to 100% cold water, and the process proceeds to Step 17. Since the mixing ratio of the mixing valve 331 is fixed, hunting does not occur thereafter.

(Step 17) The transmission disable flag is set to “ON”, the timer is started, and the process proceeds to Step 18. While the sending disabled flag is in the “ON” state, the above-described flow after step 2 is not executed, so that unnecessary processing can be avoided.

(Step 18) If the timer started in Step 17 is timed up (set to 6 hours in this case), the process proceeds to Step 19; otherwise, the process returns to the beginning of Step 18. In the present embodiment, it is assumed that the solar water heater 1 can no longer send out hot water due to the freezing of the hot water in the solar water heater 1, so that after 6 hours, the hot water in the solar water heater 1 will rise due to an increase in temperature. A 6-hour timer has been set in order to eliminate the freeze.

(Step 19) The transmission disable flag is set to “OFF” and the timer is started to return to the top of the loop. That is, when the transmission disable flag is set to “ON”, the state is maintained for 6 hours.

  In addition, as in this embodiment, when it is determined that hot water cannot be delivered due to freezing of hot water in the solar water heater 1, it is determined whether or not freezing has occurred until a high temperature when there is no risk of freezing. do not have to. Therefore, the solar water heater 1 is provided with a freeze prevention means (for example, a freeze prevention heater) and a history recording means for recording the operation history of the freeze prevention means, and the operation history is traced back for a predetermined time (for example, 24 hours), If the freeze prevention unit is not operated within a predetermined time, the processing after step 1 may not be executed.

  Further, a thermistor (hereinafter referred to as “environmental temperature detection means”) is provided inside or outside the casing of the hot water supply device connection unit 3, and the ambient temperature inside the casing or the installation environment of the hot water supply device connection unit 3. When the temperature detected by any one of the ambient temperature detection means, the cold water thermistor 313, the hot water thermistor 322, or the mixed water thermistor 333 falls below a predetermined temperature, a solar water heater is detected. Steps 16 to 19 may be executed on the assumption that the hot water in 1 is frozen. The predetermined temperature is a temperature (0 + α) ° C. obtained by adding a slight safety margin to the freezing point, but the magnitude of α is appropriately determined depending on the conditions of the installation environment of the solar water heater 1 and the hot water supply device connection unit 3. To do. For example, if the difference between the temperature in the hot water supply device connection unit 3 and the temperature in the solar water heater 1 is large, α is increased, and if it is small, α is decreased.

  The control device 34 may be configured by dedicated hardware, or may be realized by creating a program describing the processing of steps 1 to 19 and installing the program in a computer.

It is a block diagram of the hot water supply system which shows the Example of this invention. 3 is a control block diagram illustrating a configuration of a control device 34. FIG. 3 is a flowchart showing the operation of a control device 34. 3 is a flowchart showing the operation of a control device 34.

Explanation of symbols

1 Solar water heater (hot water supply device)
DESCRIPTION OF SYMBOLS 11 Stop valve 12 Stop valve 2 Water supply pipe 3 Hot water supply apparatus connection unit 311 Check valve for cold water 312 Pressure-reducing valve 313 Thermistor for cold water 314 High temperature hot water prevention valve (bypass valve)
321 Hot water check valve 322 Hot water thermistor 331 Mixing valve 332 Mixed water flow sensor 333 Mixed water thermistor 334 Pump 335 Overpressure relief valve 34 Controller 341 First flow rate comparing means 342 Mixing valve stop means 343 Bypass valve opening Means 344 Second flow rate comparison means 4 Water heater (auxiliary heat source machine)
41 Remote control terminal block 42 Remote control 5 Faucet 6 Bathtub 61 Hot water tube

Claims (7)

A mixing valve that mixes cold water and hot water supplied from a hot water supply device at an appropriate ratio to prepare mixed water at a desired temperature;
A cold water supply pipe for supplying the cold water to the mixing valve;
A hot water supply pipe for supplying the hot water to the mixing valve;
A mixed water delivery pipe for delivering the mixed water from the mixing valve to an auxiliary heat source unit;
A bypass pipe that bypasses the mixing valve from the cold water supply pipe to the mixed water delivery pipe;
A bypass valve for opening and closing the bypass pipe;
A flow rate detecting means for detecting a flow rate of the mixed water discharged from the mixed water delivery pipe;
Temperature detecting means for detecting the temperature of the mixed water;
In the hot water supply device connection unit comprising the mixing valve and a control device for controlling opening and closing of the bypass valve,
The controller is
First flow rate comparing means for comparing the detected flow rate of the flow rate detecting means with a first threshold when the mixing valve is operated in a direction to increase the ratio of the hot water;
Mixing valve stopping means for stopping an operation of changing the opening of the mixing valve when the detected flow rate of the flow rate detecting means is lower than the first threshold;
Bypass valve opening means for opening the bypass valve when operation of the mixing valve is stopped;
And when the bypass valve is opened, the detected flow rate of the flow rate detecting means is compared with a second threshold value greater than the first threshold value, and the detected flow rate of the flow rate detecting means is equal to or greater than the second threshold value. If so, a hot water supply device connecting unit comprising: a second flow rate comparing means that fully opens the cold water side valve of the mixing valve and fixes the warm water side valve in a fully closed state. The bypass valve opening means closes the hot water tap connected to the downstream of the mixing valve so that the detected flow rate of the flow rate detecting means is within a predetermined time after the operation of the mixing valve is stopped by the mixing valve stopping means. Or opening the bypass valve when a state that exceeds a third threshold value that is smaller than the first threshold value for determining that the valve is in the process of being closed and that is below the first threshold value continues. The hot water supply device connection unit according to claim 1. The second flow rate comparison means, the cold water side is fully closed that state the hot water side of the valve as well as fully opening the valve of the mixing valve maintains a predetermined time, according to claim 1 or 2, characterized in that subsequent release The hot water supply device connection unit described in 1. A mixing valve that mixes cold water and hot water supplied from a hot water supply device at an appropriate ratio to prepare mixed water at a desired temperature;
A cold water supply pipe for supplying the cold water to the mixing valve;
A hot water supply pipe for supplying the hot water to the mixing valve;
A mixed water delivery pipe for delivering the mixed water from the mixing valve to an auxiliary heat source unit;
A bypass pipe that bypasses the mixing valve from the cold water supply pipe to the mixed water delivery pipe;
A bypass valve for opening and closing the bypass pipe;
A flow rate detecting means for detecting a flow rate of the mixed water discharged from the mixed water delivery pipe;
Temperature detecting means for detecting the temperature of the mixed water;
In the control method of the hot water supply device connecting unit comprising the mixing valve and a control device for controlling opening and closing of the bypass valve,
A first flow rate comparing step of comparing a detected flow rate of the flow rate detecting means with a first threshold when the mixing valve is operated in a direction to increase the ratio of the hot water;
A mixing valve stop step of stopping an operation of changing the opening of the mixing valve when the detected flow rate of the flow rate detecting means is lower than the first threshold;
A bypass valve opening step of opening the bypass valve when operation of the mixing valve is stopped;
And when the bypass valve is opened, the detected flow rate of the flow rate detecting means is compared with a second threshold value greater than the first threshold value, and the detected flow rate of the flow rate detecting means is equal to or greater than the second threshold value. If so, a second flow rate comparison step of fixing the cold water side valve of the mixing valve to a fully open state and the warm water side valve to be fully closed;
A control method for a hot water supply apparatus connection unit. In the bypass valve opening step , within a predetermined time after the operation of the mixing valve is stopped, the detected flow rate of the flow rate detecting means is in the process of closing or closing the hot water tap connected downstream of the mixing valve. claims when exceeded the first threshold value smaller than the third threshold value for determining that a, and a state below the first threshold value is continued, characterized by opening the bypass valve Item 5. A method for controlling a hot water supply apparatus connection unit according to Item 4 . The second flow rate comparing step, the cold water side condition fully closed the hot water side of the valve as well as fully opening the valve of the mixing valve maintains a predetermined time, according to claim 4 or 5, characterized in that subsequent release The control method of the hot water supply apparatus connection unit of description. A program that, when executed by a computer, causes the computer to function as a control device for the hot water supply device connection unit according to any one of claims 1 to 3 .

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