JP4327147B2 - Hot water system - Google Patents

Description

  The present invention relates to a hot water supply system.

  As this type of hot water supply system, for example, a configuration as disclosed in Patent Document 1 is known. As shown in FIG. 1, the hot water supply system 1 is mainly composed of a solar water heater 10, a pressurizing pump 20, and a hot water heater 30. The pressurizing pump 20 is disposed between the solar water heater 10 and the water heater 30, and the solar water heater 10 and the pressurizing pump 20, and the pressurizing pump 20 and the water heater 30 are connected by a water supply pipe 21. Yes.

  The solar water heater 10 warms internal water by solar heat. The solar water 11 heated inside the solar water heater 10 is supplied with hot water via the pressurizing pump 20 based on an operation of a currant 60 (faucet) connected to the water heater 30 or a remote controller (hereinafter referred to as “remote controller 70”). To the vessel 30. Since the solar water heater 10 is usually installed on the roof of a house, the water pressure of the solar water 11 supplied from the solar water heater 10 is determined by the installation height of the solar water heater 10. However, the water pressure of the solar water 11 due to natural fall is lower than the water pressure of the tap water 51 supplied from the water pipe 50. For this reason, when these solar water 11 and tap water 51 are mixed and used, the feed water pressure of the solar water 11 is increased by the pressurizing pump 20 in order to reduce the pressure difference between them.

  An electric mixing valve 31 is disposed in the water heater 30. The electric mixing valve 31 adjusts the amount of the solar water 11 and the tap water 51 to generate the mixed water 32, and is connected to the water supply pipe 21 to which the solar water 11 is supplied. 31a, a water supply port 31b connected to a water supply pipe 52 to which tap water 51 is supplied, and a mixing connection port 31c from which the mixed water 32 is discharged. The electric mixing valve 31 is provided with a valve (not shown) that changes the ratio of the flow rate of the solar water 11 and the flow rate of the tap water 51, and this valve is controlled by a control device 33 disposed in the water heater 30. The By moving the valve by the control device 33 and changing the flow rate ratio of the solar water 11 and the tap water 51, it is possible to approach the mixed water 32 having a preset temperature set by the remote controller 70 in advance. Specifically, when the mixed water 32 is higher than the set temperature, the control device 33 adjusts the valve of the electric mixing valve 31 so that the ratio of the tap water 51 is increased, so that the mixed water 32 is higher than the set temperature. When low, the valve of the electric mixing valve 31 is adjusted so that the flow rate ratio of the solar water 11 is increased.

  In the water heater 30, a mixing pipe 36 connected to the mixing connection port 31 c of the electric mixing valve 31 is connected. One end of the mixing pipe 36 is connected to the mixing connection port 31 c and the other end is connected to the currant 60. In the mixing pipe 36, an incoming thermistor 35 as a temperature sensor for detecting the temperature of the mixed water 32, a flow rate sensor 37 for detecting the flow rate of the mixed water 32, and a tapping thermistor 38 for detecting the temperature of the mixed water 32 are mixed connection ports 31c. It arrange | positions in order toward the currant 60 from the side. A burner 34 for heating the mixed water 32 is disposed between the incoming water thermistor 35 and the flow rate sensor 37. That is, the mixed water 32 heated by the burner 34 is discharged from a currant 60 that is a hot water supply port through the mixing pipe 36. Further, a flow rate sensor 37 is disposed between the burner 34 and the currant 60, and the flow rate sensor 37 can detect the fire extinguishing flow rate as the lowest flow rate at which the mixed water 32 can be burned by the burner 34. ing. Note that the fire extinguishing flow rate means that when the mixed water 32 having a flow rate less than the fire extinguishing flow rate is heated by the burner 34, the mixed water 32 is overheated and the mixed water 32 is overheated, so the combustion of the burner is stopped. This is the flow rate of fire (extinguishing).

  The control device 33 compares the temperature of the incoming water thermistor 35 and the hot water thermistor 38 with the set temperature set by the remote controller 70, and performs the operation control of the electric mixing valve 31 and the combustion control of the burner 34. Further, the control device 33 drives the pressurizing pump 20 when the flow rate sensor 37 detects the mixed water 32 that is equal to or higher than the fire-extinguishing flow rate and is equal to or higher than the preset flow rate, and the flow rate that is equal to or greater than the fire-extinguishing flow rate When less than 32 of the mixed water 32 is detected by the flow sensor 37, the drive of the pressurizing pump 20 is stopped. In this way, the control device 33 stabilizes the feed water pressure in the electric mixing valve 31 by driving the pressure pump 20 only when the mixed water 32 is equal to or higher than the fire extinguishing flow rate and equal to or higher than the preset flow rate. ing.

  The remote controller 70 is set with first to third operation modes as operation modes. The first operation mode is a mode in which solar water 11 and tap water 51 are mixed and adjusted to a preset water temperature without using the burner 34. The second operation mode is a mode in which the solar water 11 and the tap water 51 are mixed and adjusted to a preset water temperature by combustion of the burner 34 when the mixed water is lower than the preset water temperature. The third mode is a mode in which only the tap water 51 is adjusted to a preset water temperature by combustion of the burner 34 without using the solar water 11.

Next, the operation in the second operation mode of the hot water supply system will be described.
When the second operation mode is selected by the remote controller 70, the electric mixing valve 31 is switched to the solar water full open side. When the currant 60 is opened in this state, the solar water 11 and the tap water 51 are guided to the mixing pipe 36 through the electric mixing valve 31. At this time, when the flow rate of the mixed water 32 detected by the flow rate sensor 37 is equal to or greater than the fire extinguishing flow rate and less than a preset flow rate, the control device 33 drives the pressurizing pump 20 to supply the solar water 11. Increase water pressure. Further, when the flow rate of the mixed water 32 detected by the flow rate sensor 37 is equal to or greater than the fire extinguishing flow rate and less than a preset flow rate, the control device 33 does not drive the pressurizing pump 20. After that, when the temperature of the mixed water 32 from the electric mixing valve 31 is detected by the incoming water thermistor 35 and the temperature of the mixed water 32 is lower than the set temperature set by the remote controller 70, the control device 33 The burner 34 is combusted while the solar water 31 is fully opened, and the mixed water 32 is heated to control the combustion so that the set temperature is reached. When the temperature of the mixed water 32 is higher than the set temperature, the electric mixing valve 31 is driven to the tap water side, and the valve is controlled so that the set temperature is reached.

In this way, the hot water supply system 1 pressurizes the solar water 11 by driving the pressurizing pump 20 when the mixed water 32 is equal to or higher than the extinguishing flow rate and higher than the preset flow rate. The difference between the feed water pressure and the feed water pressure of the solar water 11 is reduced as much as possible. Moreover, when the mixed water 32 is more than a fire extinguishing flow volume and less than the preset flow volume, the drive of the pressurization pump 20 is stopped and the difference of the water supply pressure of the solar water 11 and the tap water 51 is reduced as much as possible. .
JP 2000-257955 A

  However, the conventional hot water supply system 1 has the following problems. That is, when the temperature is set by the user using the remote controller 70 when the hot water supply system 1 is used, the solar water 11 staying in the outdoor pipe of the water supply pipe 21 is operated by operating the water heater 30. For was always being wasted. And since it is necessary to judge the temperature of the mixed water 32 at the time of mixing in consideration of the division between the stagnant water and the solar water 11 in the solar water heater 10 main body, the control for hot water supply becomes complicated. There was a problem. In addition, it is desired for the user that hot water having a set temperature can be obtained immediately when the currant 60 is opened. Further, when the flow rate of the mixed water 32 exceeds the preset fire extinguishing flow rate, the drive control of the pressurizing pump 20 is performed. For this reason, the water temperature of the mixed water 32 is lower than the set temperature, and after the burner 34 is burned, the currant 60 is squeezed so that the flow rate of the mixed water 32 exceeds the fire extinguishing flow rate and becomes lower than the preset flow rate. In this case, the combustion of the burner 34 continues, but the drive of the pressurizing pump 20 is stopped. Therefore, in this state, since the pressurizing pump 20 is not used, the mixed water 32 is not fed into the mixing pipe 36 at a constant flow rate. When combustion is performed by the burner 34 in this state, the mixed water 32 is heated. There was a risk that it could not be performed stably. When the drive of the pressurizing pump 20 is stopped, the mixed water 32 in the mixing pipe 36 is greatly reduced to be less than the fire extinguishing flow rate, and the burner 34 may be extinguished.

  The present invention has been made in view of such circumstances, and the object thereof is to reliably stabilize the flow rate of solar water or mixed water sent from an electric mixing valve in the combustion state of the burner, and to efficiently supply hot water. It is to provide a hot water supply system that can do.

  In order to solve the above problems, the invention described in claim 1 includes a solar water heater that heats water using solar heat, a pressure pump that pressurizes solar water heated by the solar water heater, A mixing valve for mixing solar water from the solar water heater and tap water from a water pipe, and a burner for heating the solar water sent through the mixing valve or the mixed water of solar water and tap water A water heater having a flow rate, a flow rate sensor for detecting the flow rate of the solar water or mixed water sent from the mixing valve, and a temperature sensor for detecting the temperature of the solar water or mixed water sent from the mixing valve And a controller for comparing the water temperature detected by the temperature sensor with a preset water temperature to operate the mixing valve, burner combustion control, and pressurization pump operation, The flow sensor is The fire extinguishing flow rate for stopping combustion of the burner, the pressurizing pump operating flow rate set lower than the fire extinguishing flow rate as a condition for operating the pressurizing pump, and the fire extinguishing flow rate as a condition for starting combustion of the burner When the flow rate sent from the mixing valve becomes equal to or higher than the pressure pump operating flow rate, the control device can detect the set ignition flow rate. When the flow rate of the solar water or mixed water sent from the mixing valve is equal to or higher than the ignition flow rate, and the water temperature of the solar water or mixed water is set in advance. The gist of the invention is that the burner is ignited and controlled to a preset water temperature when the water temperature is lower.

  According to the structure of this invention, a control apparatus pressurizes solar water with a pressurization pump, when it becomes more than the pressurization pump operation flow rate smaller than a fire extinguishing flow rate. Therefore, for example, unlike the case where solar water is pressurized by driving a pressurizing pump after burning the burner, the mixed water from the mixing valve is vigorously fed by the solar water sent by the pressurizing pump. The flow rate does not become unstable. Also, when the flow rate of solar water or mixed water is reduced by gradually closing the currant or the like from the burner combustion state, the flow rate of the solar water or mixed water sent from the mixing valve stops the burner combustion. The driving of the pressurizing pump is stopped when it becomes less than the fire extinguishing flow rate. For this reason, the flow volume of the solar water or mixed water sent from the mixing valve can be reliably stabilized in the combustion state of the burner, and hot water can be efficiently supplied.

  According to a second aspect of the present invention, in the hot water supply system according to the first aspect, the control device is configured such that a flow rate of the solar water or mixed water sent from the mixing valve is equal to or higher than the pressure pump operating flow rate. If the flow rate of the solar water or mixed water does not exceed the ignition flow rate even after a predetermined time has passed even though the pressurization pump is driven, the drive signal to the pressurization pump is stopped. The summary is as follows.

  According to the configuration of the present invention, when the solar water or the mixed water sent from the mixing valve does not exceed the ignition flow rate, the heating based on the burner combustion cannot be stably performed, so that a predetermined time elapses. However, if the flow rate of the solar water or the mixed water sent from the mixing valve does not reach the ignition flow rate, the drive of the pressurizing pump is stopped. Therefore, unnecessary pressurization of solar water by the pressurizing pump can be suppressed, and power and water can be saved.

  According to a third aspect of the present invention, in the hot water supply system according to the first or second aspect, when the flow rate sent from the mixing valve is equal to or higher than the pressure pump operating flow rate, the control device The gist of the invention is that a drive signal is output to the pressurizing pump and a mixing valve drive signal for operating the mixing valve is output to the mixing valve.

  According to the configuration of the present invention, when the flow rate sensor detects that the flow rate sent from the mixing valve is equal to or higher than the pressure pump operating flow rate, the control device outputs a drive signal to the pressure pump and mixes the mixing valve. To output a mixing valve drive signal. For this reason, even though the temperature of the solar water or mixed water sent from the mixing valve is detected by the temperature sensor and the mixing valve is adjusted, the vigorous solar water sent later by the pressure pump As a result, the water temperature is prevented from changing abruptly. Accordingly, the water temperature is detected by the temperature sensor while the flow rate of the solar water or the mixed water sent from the mixing valve is constant, and the solar water or the mixed water is efficiently warmed by the burner based on the water temperature.

  ADVANTAGE OF THE INVENTION According to this invention, the flow volume of the solar water or mixed water sent from an electric mixing valve can be reliably stabilized in the combustion state of a burner, and hot water can be supplied efficiently.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which the present invention is embodied in a hot water supply system 1 will be described with reference to FIGS. In addition, the hot water supply system 1 of this embodiment differs from the said conventional hot water supply system 1 by the point of the control method of the pressurization pump 20 by the control apparatus 33. FIG. For this reason, the same code | symbol is attached | subjected about the same member structure as the said conventional hot water supply system 1, and the duplicate description is abbreviate | omitted.

  The flow rate sensor 37 is set to the fire extinguishing flow rate as the minimum flow rate at which the combustion state in the burner 34 is stopped, the pressurization pump operating flow rate set to a flow rate lower than the fire extinguishing flow rate, and the flow rate higher than the fire extinguishing flow rate. The ignition flow rate as a flow rate for starting the combustion state in the burner 34 is detected. In this embodiment, the fire extinguishing flow rate is set to 1.8 liters per minute, the pressure pump operating flow rate is set to 1.5 liters per minute, and the ignition flow rate is set to 3.0 liters per minute. ing.

  When the flow rate of the solar water 11 or the mixed water 32 detected by the flow rate sensor 37 is less than the pressurization pump operation flow rate or more than the pressurization pump operation flow rate, the control device 33 in the present embodiment controls the pressurization pump 20. To output a drive signal for driving the pressurizing pump 20. The control device 33 outputs a drive signal to the pressurizing pump 20 and also outputs a mixing valve drive signal for operating the valve of the electric mixing valve 31 based on the water temperature detected by the incoming water thermistor 35 and the hot water thermistor 38. The flow rates of the tap water 51 and the solar water 11 are adjusted. When the flow rate of the solar water 11 or the mixed water 32 detected by the flow rate sensor 37 is less than the ignition flow rate or higher than the ignition flow rate, and the control device 33 detects the solar water 11 or the mixed water 32 detected by the incoming water thermistor 35. When the water temperature is lower than the set temperature of the remote controller 70 (“40 ° C.” in the present embodiment), the burner 34 is ignited to bring the water temperature close to 40 ° C. The control device 33 determines that the predetermined time has elapsed even though the flow rate of the solar water 11 or the mixed water 32 detected by the flow rate sensor 37 has changed from less than the pressurization pump operation flow rate to more than the pressurization pump operation flow rate. If the flow rate of the solar water 11 or the mixed water 32 does not exceed the ignition flow rate, the drive signal to the pressurizing pump 20 is stopped.

  In addition, the 1st-3rd operation mode is set as an operation mode of the control apparatus 33 in this embodiment. The first operation mode is a mode in which the solar water 11 and the tap water 51 are mixed and adjusted to a preset water temperature without using the burner 34. The second operation mode is a mode in which the solar water 11 and the tap water 51 are mixed and adjusted to a preset water temperature by combustion of the burner 34 when the mixed water 32 is lower than the preset water temperature. The third mode is a mode in which only the tap water 51 is adjusted to a preset water temperature by combustion of the burner 34 without using the solar water 11. That is, the first and second operation modes are modes in which the solar water 11 heated by the solar water heater 10 is used, and the third operation mode is a mode in which the solar water 11 is not used. Each operation mode can be manually selected by the remote controller 70.

(Operation of the embodiment)
Next, operation | movement of the hot water supply system 1 in the said embodiment is demonstrated using the flowchart shown in FIG.2 and FIG.3. The operation mode is set to a second operation mode that uses the solar water 11.

(When the curan 60 is opened and hot water supply is started from the state where the curan 60 is closed)
When the currant 60 is opened and hot water supply is started, as shown in FIG. 2, first, in step S <b> 1, the control device 33 determines whether or not the flow rate sensor 37 has detected a flow rate equal to or higher than the pressurizing pump operating flow rate. When the flow rate detected by the flow rate sensor 37 is less than the pressurizing pump operating flow rate, the processing here is temporarily terminated. On the other hand, when the flow rate detected by the flow sensor 37 becomes less than the pressurization pump operation flow rate to the pressurization pump operation flow rate or more, the control device 33 outputs a drive signal to the pressurization pump 20 and mixes to the electric mixing valve 31. A valve drive signal is output (step S2).

  Next, as shown in step S <b> 3, the control device 33 determines whether or not the flow rate sensor 37 detects a flow rate equal to or higher than the pressurizing pump operating flow rate and detects a flow rate equal to or higher than the ignition flow rate within a predetermined time. If the flow rate sensor 37 does not become a flow rate higher than the ignition flow rate within a predetermined time even though the flow rate sensor 37 becomes lower than the pressure pump operation flow rate to a flow rate higher than the pressure pump operation flow rate, the processing here is temporarily terminated. On the other hand, when the flow rate sensor 37 becomes a flow rate that is higher than the pressurization pump operation flow rate and less than the pressurization pump operation flow rate and becomes a flow rate that is equal to or higher than the ignition flow rate within a predetermined time, the process proceeds to the next process (step S4).

  Next, as shown in step S4, the control device 33 determines whether or not the water temperature detected by the incoming water thermistor 35 is equal to or higher than a set temperature (40 ° C.). When the water temperature detected by the incoming water thermistor 35 is equal to or higher than the set temperature (40 ° C.), the control device 33 outputs a mixing valve drive signal for increasing the flow rate ratio of the tap water 51 to the electric mixing valve 31. Then, the temperature of the mixed water 32 decreases, and the process proceeds to the next process (step S7). On the other hand, when the water temperature detected by the incoming water thermistor 35 is lower than the set temperature (40 ° C.), the control device 33 ignites the burner 34 (step S6). Then, the water temperature of the mixed water 32 rises and the process proceeds to the next process (step S7).

  Next, as shown in step S <b> 7, the control device 33 determines whether or not the water temperature detected by the hot water thermistor 38 is 40 ° C. That is, it is determined whether or not the water temperature is preset by the remote controller 70. When the water temperature detected by the hot water thermistor 38 is 40 ° C., the control device 33 continuously maintains the operation of the pressurizing pump 20, the operation of the electric mixing valve 31, and the combustion operation of the burner 34. On the other hand, when the water temperature detected by the hot water thermistor 38 is other than 40 ° C., the control device 33 proceeds to the process of step S4 and adjusts the water temperature of the mixed water 32 again.

(When the currant 60 is opened and hot water is supplied, when the currant 60 is closed and the hot water supply amount is reduced or when hot water supply is stopped)
When the control device 33 continues the operation of the pressurizing pump 20, the operation of the electric mixing valve 31 and the combustion operation of the burner 34, when the currant 60 is closed and the amount of hot water supply is reduced or when the hot water supply is stopped, FIG. As shown in FIG. 3, first, in step S <b> 11, the control device 33 determines whether or not the flow rate sensor 37 detects a flow rate equal to or lower than the fire extinguishing flow rate. When the flow sensor 37 detects a flow rate exceeding the fire extinguishing flow rate, the control device 33 continues the operation of the pressurizing pump 20, the operation of the electric mixing valve 31, and the combustion operation of the burner 34. On the other hand, when the flow sensor 37 detects a flow rate equal to or less than the fire extinguishing flow rate, the combustion of the burner 34 is stopped (step S12).

  Next, in step S13, the control device 33 determines whether or not the flow sensor 37 has detected a flow rate that is less than the pressurization pump operating flow rate. When the flow rate sensor 37 detects a flow rate that is less than the fire-extinguishing flow rate and higher than the pressure pump operating flow rate, hot water is supplied from the currant 60 in a state where the burner 34 is not burned. On the other hand, when the flow sensor 37 detects a flow rate less than the pressurizing pump operating flow rate, the output of the drive signal to the pressurization pump 20 is stopped and the output of the mix valve drive signal to the electric mixing valve 31 is also stopped. . Then, hot water is supplied from the curan 60 to the solar water 11 or the mixed water 32 at a flow rate less than the pressurizing pump operating flow rate (step S14). Then, the process here ends.

(Effect of embodiment)
Therefore, according to the hot water supply system of the above embodiment, the following effects can be obtained.

  (1) The control device 33 pressurizes the solar water 11 with the pressurizing pump 20 when detecting that the pressurizing pump operating flow rate is lower than the extinguishing flow rate. For this reason, for example, unlike the case where the pressurizing pump 20 is driven to pressurize the solar water 11 after the burner 34 is combusted, the electric mixing is performed by the solar water 11 sent vigorously by the pressurizing pump 20. The flow rate of the solar water 11 or the mixed water 32 from the valve 31 does not become unstable. Further, when the curan 60 is gradually closed from the combustion state of the burner 34 to reduce the flow rate of the solar water 11 or the mixed water 32, the flow rate of the solar water 11 or the mixed water 32 sent from the electric mixing valve 31 is reduced. The driving of the pressurizing pump 20 is stopped when the pressurizing pump operating flow rate is less than the extinguishing flow rate for stopping the combustion of the burner 34. For this reason, the flow volume of the solar water 11, the tap water 51, or the mixed water 32 sent from the electric mixing valve 31 can be reliably stabilized in the combustion state of the burner 34, and hot water can be supplied efficiently.

  (2) When the solar water 11 or the mixed water 32 sent from the electric mixing valve 31 does not exceed the ignition flow rate, the heating based on the combustion of the burner 34 cannot be stably performed. For this reason, when the flow rate of the solar water 11 or the mixed water 32 sent from the electric mixing valve 31 does not exceed the ignition flow rate even after a predetermined time has elapsed, the drive of the pressurizing pump 20 is stopped. Therefore, unnecessary pressurization of the solar water 11 by the pressurizing pump 20 can be suppressed, and power and water can be saved.

  (3) When the control device 33 detects that the flow rate sensor 37 is equal to or higher than the pressurizing pump operating flow rate, the control device 33 outputs a drive signal to the pressurizing pump 20 and outputs a mixing valve drive signal to the electric mixing valve 31. Therefore, the water temperature of the solar water 11 or the mixed water 32 sent from the electric mixing valve 31 is detected by the incoming water thermistor 35 and the electric mixing valve 31 is adjusted. The rapid change in the water temperature is suppressed by the vigorous solar water 11 that is generated. Accordingly, the water temperature is detected by the incoming water thermistor 35 in a state where the flow rate of the solar water 11 or the mixed water 32 sent from the electric mixing valve 31 is constant, and the solar water 11 or the water is efficiently detected by the burner 34 based on the water temperature. The mixed water 32 can be warmed.

  (4) The set value of the ignition flow rate (3.0 liters per minute) is set to double the set value of the pressurizing pump operating flow rate (1.5 liters per minute). For this reason, since the pressurization pump 20 is driven when the flow rate of the solar water 11 or the mixed water 32 sent from the electric mixing valve 31 reaches the pressurization pump operating flow rate, it is sent from the electric mixing valve 31. The burner 34 can be ignited after being reliably stabilized until the flow rate of the coming solar water 11 or the mixed water 32 reaches the ignition flow rate. Thereby, the mixed water 32 can be controlled to a stable hot water supply temperature and a hot water supply amount without fluctuation.

  (5) When the control device 33 outputs a drive signal to the pressurizing pump 20 and pressurizes the solar water 11 by the pressurizing pump 20, the control device 33 also outputs a mixing valve drive signal to the electric mixing valve 31. The mixing valve 31 was driven. Then, the water temperature of the solar water 11 or the mixed water 32 is detected by the incoming water thermistor 35, and the hot water supply temperature is adjusted so as to reach the set temperature by controlling the ignition of the burner 34 or the valve of the electric mixing valve 31. For this reason, the time until the set temperature is reached after the electric mixing valve 31 is driven is shortened. Accordingly, since the rising speed can be improved at the start of hot water supply, the solar water 11 staying in the outdoor pipe of the water supply pipe 21 connecting the solar water heater 10 and the water heater 30 is effectively used as hot water. can do.

(Other embodiments)
In addition, you may change the said embodiment as follows.
In the above embodiment, the ignition flow rate is set to 3.0 liters per minute, the fire extinguishing flow rate is set to 1.8 liters per minute, and the pressure pump operating flow rate is set to 1.5 liters per minute. The flow rate is not limited to these. If the relationship of ignition flow rate> extinguishing flow rate> pressure pump operating flow rate is satisfied, the effects (1) to (3) above can be obtained.

  In the above embodiment, the combustion of the burner 34 is stopped when the flow rate sensor 37 detects a flow rate less than the fire extinguishing flow rate, and the pressure is increased when the flow rate sensor 37 detects a flow rate less than the pressurization pump operating flow rate. Although the operation of the pump 20 and the electric mixing valve 31 is stopped, it may be changed as follows. For example, when the flow sensor 37 detects a flow rate less than the fire extinguishing flow rate, the combustion of the burner 34 may be stopped, and the operation of the pressurization pump 20 and the electric mixing valve 31 may be stopped. That is, the relationship of ignition flow rate = fire extinguishing flow rate> pressure pump operating flow rate may be satisfied. In such a configuration, the processing operation of the control device 33 can be simplified.

  In the above embodiment, the flow sensor 37 is disposed between the electric mixing valve 31 and the currant 60, but the flow sensor 37 may be disposed in another location. For example, as indicated by a broken line in FIG. 1, the flow sensor 37 may be disposed in the pressurizing pump 20 or may be disposed between the pressurizing pump 20 and the electric mixing valve 31. In such a configuration, the pressure pump is detected by detecting a flow rate set in advance by the flow rate sensor 37 disposed in the pressure pump 20 or between the pressure pump 20 and the electric mixing valve 31. 20 drive control is performed. Therefore, it is not necessary to output a drive signal from the control device 33, and the pressurization pump 20 can be controlled without using the control device 33.

  In the above embodiment, the pressurization pump 20 is controlled and the electric mixing valve 31 is driven based on the flow rate sensor 37 provided in the hot water heater 30. However, the pressurization pump 20 is provided with a plurality of flow rate sensors 37. And the electric mixing valve 31 may be driven. For example, a flow rate sensor 37 different from the flow rate sensor 37 provided between the electric mixing valve 31 and the currant 60 is provided in the pressure pump 20 or between the pressure pump 20 and the electric mixing valve 31. May be. In such a configuration, since the pressurization pump 20 can be controlled and the electric mixing valve 31 can be driven based on the earlier one of the flow rate detection of the flow rate sensor 37, the solar water 11 can be stably provided. Alternatively, the mixed water 32 can be supplied. Therefore, the mixed water 32 can be controlled to a stable hot water supply temperature and amount of hot water without fluctuation.

In the above embodiment, the pressurizing pump 20 is individually provided outside the water heater 30, but may be provided inside the water heater 30. Even if it does in this way, said effect can be acquired.
Next, a technical idea that can be grasped from the embodiment and the modification will be additionally described.

  The hot water supply system according to any one of claims 1 to 3, wherein the ignition flow rate is set to be OLE_LINK12 times OLE_LINK1 with respect to the pressurizing pump operating flow rate. .

Schematic which shows the hot water supply system of this embodiment. The flowchart which shows operation | movement of the control apparatus which operates the pressurization pump of this embodiment. The flowchart which shows operation | movement of the control apparatus which stops the pressurization pump of this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Hot water supply system, 10 ... Solar water heater, 11 ... Solar water, 20 ... Pressure pump, 30 ... Hot water heater, 31 ... Electric mixing valve, 32 ... Mixed water, 33 ... Control apparatus, 34 ... Burner, 35 ... Incoming water Thermistor (temperature sensor), 37 ... flow rate sensor, 38 ... hot water thermistor (temperature sensor), 50 ... water pipe, 51 ... tap water.

Claims (3)

Mixing a solar water heater that heats water using solar heat, a pressure pump that pressurizes solar water heated by the solar water heater, solar water from the solar water heater, and tap water from a water pipe A mixing valve, a solar water sent via the mixing valve, or a water heater having a burner for heating the mixed water of the solar water and the tap water, and the solar water sent from the mixing valve or A flow rate sensor for detecting a flow rate of mixed water, a temperature sensor for detecting a temperature of the solar water or the mixed water sent from the mixing valve, a water temperature detected by the temperature sensor, and a preset water temperature. In a hot water supply system provided with a control device for performing the operation of the mixing valve, the combustion control of the burner and the operation of the pressurizing pump in comparison,
The flow rate sensor includes a fire extinguishing flow rate for stopping combustion of the burner, a pressurizing pump operating flow rate set lower than the fire extinguishing flow rate as a condition for operating the pressurizing pump, and a condition for starting combustion of the burner. It is possible to detect an ignition flow rate set higher than the fire-extinguishing flow rate, and when the flow rate sent from the mixing valve exceeds the pressure pump operating flow rate, the control device When the flow rate of the solar water or mixed water sent from the mixing valve is equal to or higher than the ignition flow rate and the temperature of the solar water or mixed water is output. When the water temperature is lower than the preset water temperature, the burner is ignited and controlled to a preset water temperature. The hot water supply system according to claim 1,
The control device has passed a predetermined time even though the flow rate of the solar water or mixed water sent from the mixing valve is equal to or higher than the pressure pump operating flow rate and the pressure pump is driven. In the hot water supply system, the driving signal to the pressurizing pump is stopped when the flow rate of the solar water or mixed water does not exceed the ignition flow rate. In the hot water supply system according to claim 1 or claim 2,
When the flow rate sent from the mixing valve is equal to or higher than the pressure pump operating flow rate, the control device outputs a driving signal to the pressure pump and mixes a mixing valve driving signal for operating the mixing valve. A hot water supply system characterized by being output to a valve.

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