JP2015194274A - water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater that can reduce a risk of freezing of hot water within a boiling-up heat exchanger.SOLUTION: A water heater includes: a boiling-up mixing valve 50 having first and second water inflow ports 50a, 50b and a water outflow port 50c; a boiling-up pump P1; temperature sensors T11, T12, T13; and a control device. When temperatures detected by the temperature sensors T11, T12, T13 reach a preset freezing prevention temperature or lower, the control device activates the boiling-up circulation pump P1 with the first water inflow port 50a opened and the second water inflow port 50b closed.

Description

  The present invention relates to a hot water supply apparatus.

  Conventionally, as a hot water supply apparatus, there is one disclosed in JP 2010-43858 A (Patent Document 1). In this hot water supply apparatus, when performing a boiling operation for boiling hot water in a hot water storage tank, a boiling pump is driven. Thereby, the hot water in the lower part in the hot water storage tank is sent to the heat pump unit, heated by the boiling heat exchanger in the heat pump unit, and then returned to the upper part of the hot water storage tank.

JP 2010-43858 A

  However, the conventional hot water supply apparatus has a problem that there is a risk of freezing of hot water in the boiling heat exchanger if the hot water does not flow through the boiling heat exchanger in winter.

  Then, the subject of this invention is providing the hot-water supply apparatus which can reduce the risk of the freezing of the hot water in a boiling heat exchanger.

In order to solve the above problems, the hot water supply apparatus of the present invention is:
A hot water storage tank for storing hot water,
A three-way valve having first and second inlet ports and outlet ports;
A bath reheating circuit for reheating hot water from the upper part of the hot water storage tank and flowing it to the first water inlet port of the three-way valve through a heat exchanger;
A boiling circuit for flowing hot water from the lower part of the hot water storage tank to the upper part of the hot water storage tank through the second water inlet port and the water outlet port of the three-way valve and a boiling heat exchanger;
A boiling pump disposed in the boiling circuit;
An anti-freezing temperature sensor provided in the boiling circuit;
A heat pump unit for boiling hot water in the hot water storage tank by the boiling heat exchanger;
A control device,
When the temperature detected by the anti-freezing temperature sensor is equal to or lower than a preset anti-freezing temperature, the control device opens the first water inlet port and closes the second water inlet port. In the state, the boiling pump is driven.

  According to the above configuration, when the temperature of the hot water in the boiling circuit detected by the freeze prevention temperature sensor becomes equal to or lower than the preset freeze prevention temperature, the control device opens the first water inlet port. And the boiling pump is driven in a state where the second water inlet port is closed. Thereby, hot water from the upper part of the hot water storage tank flows through the bath reheating circuit, then passes through the first water inlet port and the water outlet port of the three-way valve, and flows into the boiling circuit. As a result, since hot water from the upper part of the hot water storage tank can be flowed to the boiling heat exchanger, freezing of the hot water in the boiling heat exchanger can be prevented. Therefore, the hot water supply apparatus can reduce the risk of freezing of hot water in the boiling heat exchanger.

  Moreover, since the hot water from the upper part of the said hot water storage tank can be returned to the upper part of a hot water storage tank via a boiling heat exchanger, the fall of the calorie | heat amount of the hot water in the upper part of a hot water storage tank can be suppressed.

In the hot water supply apparatus of one embodiment,
The control device drives the heat pump unit when the temperature detected by the freeze prevention temperature sensor becomes equal to or lower than the freeze prevention temperature.

  According to the embodiment, when the temperature detected by the freeze prevention temperature sensor becomes equal to or lower than the freeze prevention temperature, the heat pump unit is driven by the control of the control device. Thereby, since a high temperature refrigerant | coolant can be supplied to the said boiling heat exchanger, the freezing prevention effect of the hot water in a boiling heat exchanger can be heightened.

In the hot water supply apparatus of one embodiment,
It has a hot water storage unit that houses the hot water storage tank, bath reheating circuit, boiling circuit and three-way valve,
The boiling heat exchanger is disposed in the hot water storage unit.

  According to the above embodiment, boiling heat exchange is performed on the heat pump unit side by disposing the boiling heat exchanger in the hot water storage unit that houses the hot water storage tank, the bath reheating circuit, the boiling circuit, and the three-way valve. Compared with the case where the apparatus is built-in, there is no heat dissipation of hot water in the pipe between the heat pump unit and the hot water storage unit, and hot water in the hot water storage tank can be efficiently heated.

In the hot water supply apparatus of one embodiment,
The boiling heat exchanger is disposed under the hot water storage tank.

  According to the embodiment, when the temperature detected by the anti-freezing temperature sensor becomes equal to or lower than the anti-freezing temperature and the heat pump unit is driven by the control of the control device, the heat of the refrigerant in the boiling heat exchanger Is transmitted upwards. At this time, since the boiling heat exchanger is disposed under the hot water storage tank, freezing of hot water in the boiling circuit between the hot water storage tank and the boiling heat exchanger can be prevented.

In the hot water supply apparatus of one embodiment,
An HFC refrigerant was used in the heat pump unit.

  According to the above embodiment, by using an HFC refrigerant in the heat pump unit, it becomes possible to control the tapping temperature at about 50 ° C. to about 70 ° C., and generally used bath temperature (40 ° C.). It is possible to make the temperature of the hot water to catch up.

The hot water supply apparatus of this invention is
A hot water storage tank for storing hot water,
A three-way valve having first and second inlet ports and outlet ports;
A bath reheating circuit for reheating hot water from the upper part of the hot water storage tank and flowing it to the first water inlet port of the three-way valve through a heat exchanger;
A boiling circuit for flowing hot water from the lower part of the hot water storage tank to the upper part of the hot water storage tank through the second water inlet port and the water outlet port of the three-way valve and a boiling heat exchanger;
A boiling pump disposed in the boiling circuit;
An anti-freezing temperature sensor provided in the boiling circuit;
A heat pump unit for boiling hot water in the hot water storage tank by the boiling heat exchanger;
A control device,
The control device opens the second water inlet port and closes the first water inlet port when the temperature detected by the anti-freezing temperature sensor is equal to or lower than a preset anti-freezing temperature. Thus, the three-way valve is controlled.

  According to the above configuration, the control device opens the second water inlet port when the temperature detected by the antifreezing temperature sensor is equal to or lower than a preset antifreezing temperature, and the first water inlet port. The three-way valve is controlled so that is closed. Thereby, the upper part of the hot water storage tank communicates with the lower part of the hot water storage tank through the boiling circuit. As a result, the hot water in the upper part of the hot water storage tank flows out into the boiling circuit by natural convection and flows into the lower part of the hot water storage tank. As a result, since hot water from the upper part of the hot water storage tank can be flowed to the boiling heat exchanger, freezing of the hot water in the boiling heat exchanger can be prevented. Therefore, the hot water supply apparatus can reduce the risk of freezing of hot water in the boiling heat exchanger.

  Moreover, since the flow of the hot water is generated without driving the boiling pump, power consumption can be suppressed.

  According to the hot water supply apparatus of the present invention, the control device controls the boiling pump, so that hot water from the upper part of the hot water storage tank can flow through the bath reheating circuit to the boiling circuit. Therefore, the hot water supply apparatus can reduce the risk of freezing of hot water in the boiling heat exchanger.

  Moreover, since the hot water from the upper part of the said hot water storage tank can be returned to the upper part of a hot water storage tank via a boiling heat exchanger, the fall of the calorie | heat amount of the hot water in the upper part of a hot water storage tank can be suppressed.

  According to this invention, when the control device controls the three-way valve, the hot water in the upper part of the hot water storage tank flows out into the boiling circuit by natural convection and flows into the lower part of the hot water storage tank. Therefore, since hot water from the upper part of the hot water storage tank can be flowed to the boiling heat exchanger, freezing of hot water in the boiling heat exchanger can be prevented. Therefore, the hot water supply apparatus can reduce the risk of freezing of hot water in the boiling heat exchanger.

  Moreover, since the flow of the hot water is generated without driving the boiling pump, power consumption can be suppressed.

FIG. 1 is a piping system diagram of a heat pump type hot water supply apparatus according to a first embodiment of the present invention. FIG. 2 is a control block diagram of the hot water supply apparatus. FIG. 3 is a piping system diagram of a modification of the hot water supply apparatus. FIG. 4 is a control block diagram of a heat pump type hot water supply apparatus according to the second embodiment of the present invention.

  Hereinafter, the hot water supply apparatus of the present invention will be described in detail with reference to the illustrated embodiments.

[First Embodiment]
FIG. 1 is a piping system diagram of a heat pump type hot water supply apparatus according to a first embodiment of the present invention.

  The hot water supply apparatus includes a hot water storage unit 1 and a heat pump unit 2 connected to the hot water storage unit 1.

  The hot water storage unit 1 includes a hot water storage tank 3 for storing hot water, a boiling heat exchanger 10, a reheating heat exchanger 20, a boiling mixing valve 50, a control device 100 (shown in FIG. 2), and the like. Have The boiling mixing valve 50 is an example of a three-way valve.

  One end of the pipe L1 is connected to the lower part of the hot water storage tank 3, and the other end of the pipe L1 is connected to the second water inlet port 50b of the boiling mixing valve 50. One end of the pipe L <b> 2 is connected to the water outlet port 50 c of the boiling mixing valve 50, and the other end of the pipe L <b> 2 is connected to one end of the boiling heat exchanger 10. Further, the other end of the boiling heat exchanger 10 is connected to one end of the pipe L <b> 3, and the other end of the pipe L <b> 3 is connected to a return port 3 a provided in the upper part of the hot water storage tank 3. A circulating pump P1 for boiling is disposed in the pipe L2. The boiling circulation pump P1 is an example of a boiling pump.

  The pipe L1, the pipe L2, the boiling heat exchanger 10 and the pipe L3 constitute a boiling circuit. That is, in the hot water supply device, hot water from the lower part of the hot water storage tank 3 is supplied to the upper part of the hot water storage tank 3 via the second water inlet port 50b and the water outlet port 50c of the hot water mixing valve 50 and the boiling heat exchanger 10. It has a boiling circuit to flow through.

  The boiling mixing valve 50 has first and second water inlet ports 50a and 50b and a water outlet port 50c. The boiling mixing valve 50 is a three-way mixing valve capable of mixing hot water flowing from the upper part of the hot water storage tank 3 via a bath reheating circuit described later and hot water from the lower part of the hot water storage tank. Moreover, the hot water in the hot water storage tank 3 is driven by driving the boiling circulation pump P1 in a state where the opening of the second water inlet port 50b (the incoming water port on the hot water storage tank 3 side) of the boiling mixing valve 50 is fully opened. Is circulated through the pipe L1, the boiling mixing valve 50, the pipe L2, the boiling heat exchanger 10, and the pipe L3. At this time, the opening degree of the first water inlet port 50a (water inlet port on the reheating heat exchanger 20 side) of the boiling mixing valve 50 is fully closed.

  The boiling heat exchanger 10 is connected to the heat pump unit 2 via refrigerant pipes L4 and L5. The heat pump unit 2 uses an HFC refrigerant, and can control the temperature of the hot water from the boiling heat exchanger 10 in a range of, for example, 50 ° C to 70 ° C. Examples of the HFC refrigerant used in the heat pump unit 2 include R32, R125, R134a, R404A, R410A, and R407C.

  Next, an external water supply pipe is connected to the lower part of the hot water storage tank 3 through a pipe L11. A pressure reducing valve 11 and a check valve 12 are arranged in this pipe L11 in order from the upstream side. This check valve 12 allows only the flow from the water supply pipe side to the hot water storage tank 3 side.

  In addition, one end of the pipe L21 is connected to the hot water outlet 3b provided in the upper part of the hot water storage tank 3, and the other end of the pipe L21 is connected to the primary water inlet port of the heat exchanger 20. One end of the pipe L22 is connected to the primary water outlet port of the reheating heat exchanger 20, and the other end of the pipe L22 is connected to the first water inlet port 50a of the boiling mixing valve 50.

  The said pipe L21, the reheating heat exchanger 20, and the piping L22 comprise the bath reheating circuit. That is, the hot water supply apparatus includes a bath reheating circuit for reheating hot water from the upper portion of the hot water storage tank 3 and flowing it to the first water inlet port 50 a of the mixing valve 50 for boiling through the heat exchanger 20.

  By driving the boiling circulation pump P1 with the opening degree of the first inlet port 50a (the inlet port on the side of the bath reheating circuit) of the boiling mixing valve 50 fully opened, the upper portion in the hot water storage tank 3 is driven. Is circulated through the pipe L21, the reheating heat exchanger 20 (primary side), the pipe L22, the boiling mixing valve 50, the pipe L2, the boiling heat exchanger 10, and the pipe L3. At this time, the second water inlet port 50b (water inlet port on the hot water storage tank 3 side) of the boiling mixing valve 50 is opened and closed as necessary.

  Further, one end of the pipe L31 is connected to the upper part of the hot water storage tank 3, and the other end of the pipe L31 is connected to the first water inlet port 22a of the hot water supply mixing valve 22. A check valve 21 that allows only the flow from the hot water storage tank 3 side to the hot water supply mixing valve 22 is disposed in the pipe L31. Further, one end of the branch pipe L12 is connected to the second water inlet port 22b of the hot water mixing valve 22, and the other end of the branch pipe L12 is connected between the pressure reducing valve 11 and the check valve 12 of the pipe L11. . A check valve 23 that allows only the flow from the pipe L11 side to the hot water supply mixing valve 22 is disposed in the branch pipe L12.

  One end of the pipe L32 is connected to the water outlet port 22c of the hot water mixing valve 22, and the other end of the pipe L32 is connected to the hot water tap 60 (a faucet in this embodiment). A water amount sensor 24 is disposed in the pipe L32.

  The branch pipe L12, the pipe L31, the pipe L32, the check valve 21, the hot water supply mixing valve 22, the check valve 23, and the water amount sensor 24 constitute a hot water supply circuit.

  Further, one end of the pipe L33 is connected to the upstream side of the water amount sensor 24 of the pipe L32, and the other end of the pipe L33 is connected to the hot water supply port 9a of the connection adapter 9 provided in the bathtub 4. In the pipe L33, a hot water filling electromagnetic valve 25, a check valve 26, a water amount sensor 27, and a check valve 28 are sequentially arranged from the upstream side. These check valves 26 and 28 allow only the flow from the hot water supply mixing valve 22 side to the bathtub 4.

  The pipe L33, the hot water solenoid valve 25, the check valve 26, the water amount sensor 27, and the check valve 28 form a bath hot water supply circuit branched from the pipe L32 of the hot water supply circuit and connected to the bathtub 4.

  One end of the pipe L35 is connected to the water intake port 9b for replenishment of the connection adapter 9, and the other end of the pipe L35 is connected to the water inlet port on the secondary side of the heat exchanger 20. The pipe L35 is provided with a bath circulation pump P2. Further, one end of the pipe L34 is connected to the downstream side of the water amount sensor 27 of the pipe L33, and the other end of the pipe L34 is connected to the secondary water outlet port of the heat exchanger 20.

  By driving the bath circulation pump P2, hot water in the bathtub 4 is circulated through the pipe L35, the reheating heat exchanger 20 (secondary side), the pipe L34, and the pipe L33 (part).

  The pipe L35, the reheating heat exchanger 20 (secondary side), the pipe L34, and the pipe L33 (part) constitute a bath circulation circuit.

  Furthermore, one end of the pipe L41 is connected to the pipe L21, and the other end of the pipe L41 is connected to the drain port. A relief valve 31 is disposed in the pipe L41.

  The hot water storage tank 3 is provided with four temperature sensors T1 to T4 at substantially equal intervals from the lower side to the upper side. The pipe L2 is provided with a temperature sensor T11 for detecting the incoming water temperature, and the pipe L3 is provided with a temperature sensor T12 for detecting the hot water temperature. The temperature sensors T11 and T12 are located in the vicinity of the boiling heat exchanger 10. Here, the incoming water temperature refers to the temperature of hot water just before flowing into the boiling heat exchanger 10. In addition, the tapping temperature refers to the temperature of hot water immediately after flowing out of the boiling heat exchanger 10.

  The boiling heat exchanger 10 is provided with a temperature sensor T13. In addition, a temperature sensor T <b> 21 for detecting a hot water supply temperature is provided in the pipe L <b> 32 connected to the hot water tap 60 on the downstream side of the water amount sensor 24. In addition, the pipe L35 connected to the bathtub 4 includes a water level sensor LS, a water flow switch SW, and a temperature sensor T23 in order from the connection adapter 9 side between the connection adapter 9 on the bathtub 4 side and the circulation pump P2 for bath. Provided. Further, a temperature sensor T22 that detects the temperature of the hot water supplied to the bathtub 4 is provided downstream of the check valve 28 of the pipe L33 connected to the bathtub 4 and at a connection point between the pipe L33 and the pipe L34. Provided.

  The temperature sensor T13 detects the temperature of the refrigerant in the boiling heat exchanger 10 during the boiling operation. When the boiling operation is stopped, the temperature of the refrigerant in the boiling heat exchanger 10 becomes substantially the same as the temperature of hot water in the boiling heat exchanger 10. Thereby, the temperature of the hot water in the boiling heat exchanger 10 can be detected by the temperature sensor T13 while the boiling operation is stopped.

  FIG. 2 is a control block diagram of the hot water supply apparatus.

  The hot water supply apparatus includes a control device 100 including a microcomputer and an input / output circuit, and a remote controller 200 that transmits and receives signals to and from the control device 100. The control device 100 receives signals from temperature sensors T1 to T4, T11 to T13, T21 to T23, a water level sensor LS, a water flow switch SW, water volume sensors 24 and 27, an outside air temperature sensor (not shown), and the like. The heat pump unit 2, the boiling circulation pump P1, the bath circulation pump P2, the hot water mixing valve 22, the hot water solenoid valve 25, the boiling mixing valve 50, and the like are controlled.

  In addition, the control device 100 includes a boiling control unit 100a that controls a “boiling operation”, a hot water supply control unit 100b that controls a hot water supply temperature to the hot water tap 60, a “bath hot water operation”, and the like. There are a pouring control unit 100c for controlling the pouring operation to the hot water, a reheating control unit 100d for controlling the “bath chasing operation”, and a standby control unit 100e for controlling the “standby operation”. The boiling control unit 100a, the hot water supply control unit 100b, the pouring control unit 100c, the reheating control unit 100d, and the standby control unit 100e are configured by software.

  The standby control unit 100e controls the boiling mixing valve 50 during the standby operation so that the first water inlet port 50a is opened and the second water inlet port 50b is closed.

"Boiling operation"
In the boiling operation, the hot water in the hot water storage tank 3 is heated by the heat pump unit 2. More specifically, the boiling circulation pump 100 is fully opened by the boiling controller 100a of the controller 100 with the opening of the second water inlet port 50b (water inlet port on the hot water storage tank 3 side) of the boiling mixing valve 50 fully opened. P1 is operated and hot water in the hot water storage tank 3 is circulated through the pipe L1, the boiling mixing valve 50, the pipe L2, the boiling heat exchanger 10, and the pipe L3.

  The boiling control unit 100a controls the opening degree of the mixing valve 50 for boiling during the heating operation, and the heat pump unit 2 and the heat pump unit 2 so that the hot water temperature detected by the temperature sensor T12 becomes the target hot water temperature TS. The boiling circulation pump P1 is controlled. Here, the target hot water temperature TS is calculated by the control device 100 based on the amount of hot water supplied from the hot water storage tank 3 and the like. For example, when the amount of hot water used is large, the target hot water temperature TS is as high as 70 ° C., for example, and when the amount of hot water used is small, the target hot water temperature TS is as low as 50 ° C., for example.

  Then, when the incoming water temperature of the boiling heat exchanger 10 detected by the temperature sensor T11 reaches 40 ° C. to 45 ° C. (boiling end temperature), the boiling operation is finished.

"Bath bathing operation"
When the bath hot water filling operation is performed, the hot water filling electromagnetic valve 25 is opened by the pouring controller 100c of the control device 100, and the hot water in the hot water storage tank 3 is mixed with the hot water mixing valve 22 and the bath hot water supply circuit (L33, 25, 26, 27, 28) and supplied into the bathtub 4. At this time, the hot water pouring controller 100c controls the hot water supply mixing valve 22 to mix the hot water from the hot water storage tank 3 and the external water supply based on the target set temperature, and by the water level sensor LS. When the detected water level in the bathtub 4 reaches the set water level, the hot water solenoid valve 25 is closed.

"Bath chasing driving"
When the bath reheating operation is performed, the recirculation control unit 100d of the control device 100 operates the bath circulation pump P2 with the hot water solenoid valve 25 closed to supply hot water in the bathtub 4 to the pipe L35. , Circulating through the reheating heat exchanger 20 (secondary side), the pipe L34, and the pipe L33 (part).

  Then, based on the bath temperature of the hot water in the bathtub 4 detected by the temperature sensor T23, the reheating control unit 100d does not use the heat pump unit 2 but uses the hot water in the hot water storage tank 3 as a heat source. Or when the amount of heat in the hot water storage tank 3 is not sufficient, the bath driving operation is performed using the heat pump unit 2.

  In the bath reheating operation, the hot water from the boiling heat exchanger 10 is heated by the recirculation pump P1, the hot water storage tank 3, the bath reheating circuit (L21, 20, L22), and the boiling circuit (L1, L2, 10, L3) is used to circulate through the bath.

"Standby operation"
In the standby operation, the boiling circulation pump P1 is turned off. More specifically, for example, when shifting from a bath reheating operation or a boiling operation to a standby operation, the boiling circulation pump P1 is turned off, and then the standby control unit 100e of the control device 100 sets the boiling mixing valve 50. The first water inlet port 50a is opened, and the second water inlet port 50b of the boiling mixing valve 50 is closed. In the standby operation, the heat pump unit 2 is also turned off.

  In addition, during the standby operation, the control device 100 has at least one of the temperatures detected by the temperature sensors T11, T12, T13 being equal to or lower than a preset freezing prevention temperature (for example, 2 ° C. or 3 ° C.). When the first water inlet port 50a is opened and the second water inlet port 50b is closed, the boiling circulation pump P1 is driven.

  According to the hot water supply apparatus configured as described above, during standby operation, when at least one of the temperatures detected by the temperature sensors T11, T12, and T13 is equal to or lower than a preset freezing prevention temperature, the control of the control device 100 is performed. Thus, the boiling circulation pump P1 is driven. At this time, the first water inlet port 50a of the boiling mixing valve 50 is opened, and the second water inlet port 50b of the boiling mixing valve 50 is closed. Thereby, after hot water from the upper part of the hot water storage tank 3 flows through the bath reheating circuit (L21, 20, L22), it passes through the first water inlet port 50a and the water outlet port 50c of the mixing valve 50 for boiling, It flows into the pipe L2. As a result, since hot water from the upper part of the hot water storage tank 3 can be flowed to the boiling heat exchanger 10, freezing of hot water in the boiling heat exchanger 10 can be prevented. Therefore, the hot water supply apparatus can reduce the risk of freezing of hot water in the boiling heat exchanger 10.

  Moreover, since hot water from the upper part of the hot water storage tank 3 flows through the pipes L2 and L3, the risk of freezing of hot water in the pipes L2 and L3 can be reduced.

  Moreover, since the hot water from the upper part of the hot water storage tank 3 can be returned to the upper part of the hot water storage L4 tank 3 through the boiling heat exchanger 10, it is possible to suppress a decrease in the amount of hot water in the upper part of the hot water storage tank 3. Can do.

  The hot water storage tank 1, the bath reheating circuit (L 21, 20, L 22), the boiling circuit (L 1, L 2, 10, L 3) and the boiling mixing valve 50 are housed in a hot water storage unit 1 that contains boiling heat. An exchanger 10 is arranged. Therefore, compared to the case where the boiling heat exchanger 10 is built in the heat pump unit 2 side, there is no heat dissipation of hot water in the pipe between the heat pump unit 2 and the hot water storage unit, and the hot water in the hot water storage tank 3 is more efficient. Can boil well.

  Further, by using an HFC refrigerant in the heat pump unit 2, it becomes possible to control the temperature of the hot water at about 50 ° C. to about 70 ° C., and replenish the generally used bath temperature (40 ° C.). The temperature can be adjusted to the temperature of the hot water.

  In the first embodiment, the boiling control unit 100a, the hot water supply control unit 100b, the pouring control unit 100c, the reheating control unit 100d, and the standby control unit 100e are configured by software, but are configured by hardware. You may do it.

  In the first embodiment, the boiling heat exchanger 10 is disposed below the hot water storage tank 3, but the boiling heat exchanger 10 may be disposed on the hot water storage tank 3, for example.

  In the first embodiment, the heat pump unit 2 may be driven by the control device 100 when the temperatures detected by the temperature sensors T11, T12, and T13 are equal to or lower than a preset freezing prevention temperature. In this case, since a high-temperature refrigerant can be supplied to the boiling heat exchanger 10, the effect of preventing freezing of hot water in the boiling heat exchanger 10 can be enhanced.

  In that case, the heat of the refrigerant in the boiling heat exchanger 10 is transmitted upward. At this time, since the boiling heat exchanger 10 is disposed under the hot water storage tank 3, freezing of the hot water in the pipes L1, L2, and L3 can be prevented.

In the first embodiment uses the HFC refrigerant heat pump unit 2 is not limited to this refrigerant used in the heat pump unit, it may be used CO ₂ refrigerant or other coolant. For example, by using a CO ₂ refrigerant in the heat pump unit, it is possible to control the hot water temperature in a high temperature range (for example, 65 ° C. to 90 ° C.).

  In the first embodiment, the hot water supply apparatus in which the boiling heat exchanger 10 is disposed in the hot water storage unit 1 has been described. However, the present invention is applied to a hot water supply apparatus in which the boiling heat exchanger 10 is disposed in the heat pump unit 2. May be.

  In the first embodiment, instead of the boiling mixing valve 50, a boiling switching valve 150 as an example of a three-way valve may be used as shown in FIG. This boiling switching valve 150 is for either hot water flowing from the upper part of the hot water storage tank 3 through the bath reheating circuit (L21, 20, L22) or hot water from the lower part of the hot water storage tank 3. Flow in boiling heat exchanger 10. More specifically, the boiling switching valve 150 includes first and second water inlet ports 150a and 150b and a water outlet port 150c. The first water inlet port 150a is connected to the reheating heat exchanger 20 via a pipe L22. Further, the second water inlet port 150b is connected to the lower part of the hot water storage tank 3 via the pipe L1. Further, the water outlet port 150c is connected to the boiling heat exchanger 10 via a pipe L2.

  Further, in the case of using the boiling switching valve 150, the control device is such that at least one of the temperatures detected by the temperature sensors T11, T12, T13 has a preset freezing prevention temperature (for example, 2 ° C or 3 ° C). When the following conditions are met, the mixing valve 50 for boiling is controlled and the circulating pump P1 for boiling is driven so that the first inlet port 150a is opened and the second inlet port 150b is closed. . Thereby, the same effect as the effect of the said 1st Embodiment is obtained.

  Further, the boiling switching valve 150 can reliably prevent the upper part of the hot water storage tank 3 from communicating with the lower part of the hot water storage tank 3 via the bath reheating circuit (L21, 20, L22).

[Second Embodiment]
FIG. 4 is a control block diagram of a heat pump type hot water supply apparatus according to the second embodiment of the present invention. In FIG. 4, the same reference numerals as those in the first embodiment are assigned to the same components as those in the first embodiment. Also in the following description, the same reference numerals as those of the first embodiment are assigned to the same components as those of the first embodiment.

  The hot water supply apparatus differs from the first embodiment only in control during standby operation, and has the same piping path as the piping path of the first embodiment. More specifically, the hot water supply apparatus includes a control device 200 having a boiling control unit 100a, a hot water supply control unit 100b, a pouring control unit 100c, a reheating control unit 100d, and a standby control unit 100e. When at least one of the temperatures detected by the temperature sensors T11, T12, T13 becomes equal to or lower than a preset freezing prevention temperature (for example, 2 ° C. or 3 ° C.) during the standby operation, The boiling mixing valve 50 is controlled so that the second water inlet port 50b is opened and the first water inlet port 50a is closed.

  According to the hot water storage device having the above configuration, when at least one of the temperatures detected by the temperature sensors T <b> 11, T <b> 12, T <b> 13 falls below the anti-freezing temperature during standby operation, The water inlet port 50b is opened, and the first water inlet port 50a is closed. Thereby, the upper part of the hot water storage tank 3 communicates with the lower part of the hot water storage tank 3 via the boiling circuit (L1, L2, 10, L3). As a result, the hot water in the upper part of the hot water storage tank 3 flows out into the pipe L3 by natural convection and flows into the lower part of the hot water storage tank 3. As a result, since hot water from the upper part of the hot water storage tank 3 can be flowed to the boiling heat exchanger 10, freezing of hot water in the boiling heat exchanger 10 can be prevented. Therefore, the hot water supply apparatus can reduce the risk of freezing of hot water in the boiling heat exchanger 10.

  Further, since the hot water flow is generated without driving the boiling circulation pump P1, power consumption can be suppressed.

  In the first and second embodiments, whether or not at least one of the temperatures detected by the temperature sensors T11, T12, and T13 is equal to or lower than the freeze prevention temperature is determined by the heat pump unit 2 and the boiling It may be performed only when the circulation pump P1 is not driven.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, the content described in the first embodiment and the content described in the second embodiment may be appropriately combined as one embodiment of the present invention. More specifically, for example, in the second embodiment, instead of the boiling mixing valve 50, a boiling switching valve as an example of a three-way valve may be used.

DESCRIPTION OF SYMBOLS 1 Hot water storage unit 2 Heat pump unit 3 Hot water storage tank 3a Return port 3b Hot water outlet 4 Bathtub 9 Connection adapter 9a Hot water supply port 9b Water intake port for reheating 10 Heating-up heat exchanger 11 Pressure reducing valve 12, 21, 23, 26, 28 Check valve 20 Reheating Heat Exchanger 22 Hot Water Mixing Valve 24, 27 Water Volume Sensor 25 Hot Water Solenoid Valve 31 Relief Valve 50 Heating Mixing Valve 60 Hot Water Tap 100,200 Controller 100a Heating Control Unit 100b Hot Water Control Unit 100c Note Hot water control unit 100d Reheating control unit 100e Standby control unit 150 Heating switching valve L1, L2, L3, L11, L21, L22, L31 to L35, L41 piping L4, L5 refrigerant piping L12 branch piping LS water level sensor P1 boiling Circulation pump P2 Bath circulation pump SW Water flow switch T1 to T4, T11 to T13, T21 to T23 ... Temperature sensor

Claims (6)

A hot water storage tank (3) for storing hot water,
A three-way valve (50, 150) having first and second water inlet ports (50a, 150a, 50b, 150b) and a water outlet port (50c, 150c);
A bath reheating circuit (L21, 20) for flowing hot water from the upper part of the hot water storage tank (3) to the first water inlet port of the three-way valve (50, 150) via the reheating heat exchanger (20). L22)
The hot water from the lower part of the hot water storage tank (3) is heated to the second water inlet port (50b, 150b) and the water outlet port (50c, 150c) of the three-way valve (50, 150) and to the boiling heat exchanger (10). A boiling circuit (L1, L2, 10, L3) for flowing through the hot water storage tank (3) through
A boiling pump (P1) disposed in the boiling circuit (L1, L2, 10, L3);
Freezing prevention temperature sensors (T11, T12, T13) provided in the boiling circuits (L1, L2, 10, L3),
A heat pump unit (2) for boiling hot water in the hot water storage tank (3) by the boiling heat exchanger (10);
A control device (100),
When the temperature detected by the anti-freezing temperature sensor (T11, T12, T13) is equal to or lower than a preset anti-freezing temperature, the control device (100) includes the first water inlet port (50a, 150a). The hot water supply device is characterized in that the boiling pump (P1) is driven in a state in which the second water inlet port (50b, 150b) is closed. The hot water supply apparatus according to claim 1,
The control device (100) is characterized in that the heat pump unit (2) is driven when the temperature detected by the freeze prevention temperature sensor (T11, T12, T13) becomes equal to or lower than the freeze prevention temperature. Hot water supply device. The hot water supply apparatus according to claim 1 or 2,
A hot water storage unit (1) that houses the hot water storage tank (3), a bath reheating circuit (L21, 20, L22), a boiling circuit (L1, L2, 10, L3) and a three-way valve (50, 150);
The hot water supply device, wherein the boiling heat exchanger (10) is disposed in the hot water storage unit (1). The hot water supply apparatus according to claim 2,
The hot water supply apparatus, wherein the boiling heat exchanger (10) is disposed under the hot water storage tank (3). In the hot water supply device according to any one of claims 1 to 4,
A hot water supply apparatus using an HFC refrigerant in the heat pump unit (2). A hot water storage tank (3) for storing hot water,
A three-way valve (50, 150) having first and second water inlet ports (50a, 150a, 50b, 150b) and a water outlet port (50c, 150c);
A bath reheating circuit (L21, 20) for flowing hot water from the upper part of the hot water storage tank (3) to the first water inlet port of the three-way valve (50, 150) via the reheating heat exchanger (20). L22)
The hot water from the lower part of the hot water storage tank (3) is heated to the second water inlet port (50b, 150b) and the water outlet port (50c, 150c) of the three-way valve (50, 150) and to the boiling heat exchanger (10). A boiling circuit (L1, L2, 10, L3) for flowing through the hot water storage tank (3) through
A boiling pump (P1) disposed in the boiling circuit (L1, L2, 10, L3);
An anti-freezing temperature sensor (T11, T12, T13) provided in the boiling circuit (L1, L2, 10, L3);
A heat pump unit (2) for boiling hot water in the hot water storage tank (3) by the boiling heat exchanger (10);
A control device (200),
When the temperature detected by the anti-freezing temperature sensor (T11, T12, T13) is equal to or lower than a preset anti-freezing temperature, the control device (200) controls the second water inlet port (50b, 150b). And the three-way valve (50, 150) is controlled so that the first water inlet port (50a, 150a) is closed.

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