JP2018091513A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater capable of executing air venting from each pipeline of a boiling circuit and a reheating circuit surely and quickly.SOLUTION: A water heater includes: a hot water storage tank 10; a boiling circuit C1 connected to the upper part of the hot water storage tank 10 from the lower part of the hot water storage tank 10 via a boiling heat exchanger 2a; a reheating circuit C3 connected to the lower part of the hot water storage tank 10 from the upper part of the hot water storage tank 10 via a bath heat exchanger 20; a circulation pump P1 disposed at a shared pipeline part L2 in which the boiling circuit C1 and the reheating circuit C3 are partially shared; a flow passage switching valve V1 disposed on an upstream side of the shared pipeline part L2; and a control part 100 for controlling the flow passage switching valve. The control part 100 controls so as to switch the flow passage switching valve V1 between the boiling circuit C1 side and the reheating circuit C3 side during an air venting operation.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a hot water storage type hot water supply apparatus.

  Conventionally, as a hot water storage type hot water supply device, a hot water storage tank, a heat pump unit for boiling water in the hot water storage tank, a boiling circuit for performing circulation between the hot water storage tank and the heat pump unit, and a boiling circuit A recirculation pump for heating, a reheating circuit for performing circulation between the hot water storage tank and the bath heat exchanger, and a recirculation pump for reheating disposed in the reheating circuit. There are some (see, for example, Patent Document 1).

JP 2013-87798 A

  In the hot water supply apparatus of Patent Document 1, since the boiling circuit and the reheating circuit are configured as separate circuits and two circulation pumps are used, the boiling circulation pump operates during the boiling operation, The recirculation pump is operated during reheating operation.

  Various trial runs are performed when the water heater is installed. During the test operation, each of the boiling circulation pump and the recirculation circulation pump is operated to vent the air in the piping of the corresponding circuit. When the boiling circuit and the reheating circuit are separate circuits, the corresponding circulation pumps are operated to release air from each pipe in each circuit.

  By the way, in order to reduce the size and cost of the hot water supply device, the boiling circulation pump and the recirculation pump are made common, and the circulation of the reheating circuit and the recirculation circuit are performed by one circulation pump. Efforts to make it happen. When the circulation of both circuits is performed by one circulation pump, one circulation pump is arranged in a common piping part in which both circuits are partially common, and a switching valve for switching between the boiling circuit and the reheating circuit is provided. It arrange | positions in the upstream of a common piping part.

  When the circulation of the boiling circuit and the circulation of the reheating circuit are executed by one circulation pump, the air venting operation is executed in a state where the flow path switching valve is connected to either the boiling circuit or the reheating circuit. . In one circuit to which the flow path switching valve is connected, air escapes from the inside of the pipe, but in the other circuit to which the flow path switching valve is not connected, air remains in the pipe.

  Therefore, the technical problem to be solved by the present invention is to provide a hot water supply apparatus that can perform air venting reliably and quickly from each piping of the boiling circuit and the reheating circuit.

  In order to solve the above technical problem, the present invention provides the following hot water supply apparatus.

That is, the hot water supply apparatus according to the present invention is
A hot water storage tank,
A boiling circuit connected to the upper part of the hot water storage tank through the boiling heat exchanger from the lower part of the hot water storage tank;
A reheating circuit connected from the upper part of the hot water storage tank to the lower part of the hot water storage tank via a bath heat exchanger;
A circulation pump disposed in a common piping part in which the boiling circuit and the reheating circuit are partially common;
A flow path switching valve disposed on the upstream side of the common pipe section;
A control unit for controlling the flow path switching valve,
The control unit controls the flow path switching valve to switch between the boiling circuit side and the reheating circuit side during the air venting operation.

  According to the hot water supply apparatus of the present invention, the flow path switching valve is switched between the heating circuit side and the reheating circuit side by the control unit during the air venting operation. The air can be vented reliably and quickly.

  Further, in the hot water supply apparatus according to an embodiment, the control unit controls the flow path switching valve to be switched to the boiling circuit side after being switched to the reheating circuit side during the air venting operation.

  If the air venting operation is executed first on the side of the heating circuit that tends to increase the residual air amount due to the length of the pipe, the effect on the air venting operation on the reheating circuit side to be executed later will increase. According to the hot water supply apparatus of the above embodiment, the air venting operation on the reheating circuit side is smoothly executed.

  Moreover, in the hot water supply apparatus of one Embodiment, the said control part is controlled so that the said circulation pump may rotate with the largest rotation speed during the said air venting operation | movement.

  According to the hot water supply apparatus of the above embodiment, the work time required for the air venting operation can be shortened.

  Further, in the hot water supply apparatus according to an embodiment, the control unit controls the flow path switching valve to operate when the pump load of the circulation pump starts to increase during the air venting operation.

  Since the piping length on the boiling circuit side varies depending on the installation conditions at the site and the residual air amount is different, the switching timing of the flow path switching valve is different at each site. According to the hot water supply apparatus of the above embodiment, the air venting operation can be completed in a short time by switching the flow path switching valve at an optimal timing.

  According to the hot water supply device of the present invention, since the flow path switching valve is switched between the heating circuit side and the reheating circuit side by the control unit during the air venting operation, each pipe in the heating circuit side and the reheating circuit is provided. The air can be vented reliably and quickly.

The piping system figure of the heat pump type hot-water supply apparatus of this invention. The block diagram of the hot-water supply apparatus shown in FIG. The figure explaining the boiling circuit in the hot-water supply apparatus. The figure explaining the bath hot-water supply circuit in the hot-water supply apparatus. The figure explaining the reheating circuit in the hot-water supply apparatus. The figure explaining the bath cooling circuit in the hot-water supply apparatus. The figure explaining the hot-water supply circuit in the hot-water supply apparatus. The flowchart explaining the air venting operation control of 1st Embodiment. The flowchart explaining the air venting operation control of 2nd Embodiment.

  With reference to FIGS. 1 to 7, a hot water supply device WH of the present invention will be described in detail according to the illustrated embodiment. 1 to 3 to 7, arrows indicate directions in which water and hot water flow, and thick lines illustrated in FIGS. 3 to 7 indicate circuits in which water and hot water flow in the pipe.

  FIG. 1 shows a piping system diagram of a hot water supply device WH according to an embodiment of the present invention.

  The hot water supply device WH shown in FIG. 1 includes a hot water storage unit 1 having a hot water storage tank 10 and a heat pump unit 2 for boiling water in the hot water storage tank 10 of the hot water storage unit 1.

<Boiling circuit>
One end of the pipe L1 is connected to the lower part of the hot water storage tank 10, and the other end of the pipe L1 is connected to one input side of the pump inlet three-way valve V1 as a flow path switching valve. Further, one end of the pipe L2 is connected to the output side of the pump inlet three-way valve V1, and the other end of the pipe L2 is connected to the input side of the bypass valve V2. A circulation pump P1 for boiling is disposed in the pipe L2. Further, one end of the boiling heat exchanger 2a is connected to one output side of the bypass valve V2 via a pipe L3.

  The other end of the boiling heat exchanger 2a is connected to one end of the pipe L4, and the other end of the pipe L4 is connected to the input side of the boiling three-way valve V3. Further, one end of the pipe L6 is connected to the other output side of the bypass valve V2, and the other end of the pipe L6 is connected to the boiling three-way valve V3 side of the pipe L4.

  One end of the pipe L5 is connected to one output side of the boiling three-way valve V3, and the other end of the pipe L5 is connected to the upper part of the hot water storage tank 10. On the other hand, one end of the pipe L7 is connected to the other output side of the boiling three-way valve V3, and the other end of the pipe L7 is connected to the lower part of the hot water storage tank 10.

  As indicated by the thick lines in FIG. 3, the hot water storage tank 10 and the heat pump unit 2 are constituted by the pipes L1 to L5, L7, the pump water three-way valve V1, the boiling circulation pump P1, the bypass valve V2, and the boiling three-way valve V3. A boiling circuit C1 between the two is configured.

  In FIG. 1, the pump inlet three-way valve V1 is in a state where the pipe L2 and the pipe L26 are in communication, the bypass valve V2 is in a state where the pipe L2 and the pipe L3 are in communication, and the boiling three-way valve V3 is The pipe L4 and the pipe L7 are in communication with each other.

  A drainage two-way valve 27 is disposed in a pipe L27 closer to the hot water storage tank 10 than the pump inlet three-way valve V1 of the pipe L1. Normally, the drainage two-way valve 27 is closed, and when draining the water in the hot water storage tank 10 for maintenance or the like, the drainage two-way valve 27 is opened to allow the lower part of the hot water storage tank 10 and the drain outlet to communicate with each other. .

  With the above circulating pump P1 for boiling, the hot water in the hot water storage tank 10 is converted into a pipe L1, a pump water three-way valve V1, a pipe L2, a bypass valve V2, a pipe L3, a boiling heat exchanger 2a, a pipe L4 and a boiling three-way valve. Circulate through V3 and pipe L5 (or L7).

<Bath hot water supply circuit>
Next, an external water supply port is connected to the lower part of the hot water storage tank 10 via the pipe L11. In order from the upstream side, a strainer 11, a check valve 12 that allows only a flow from the water supply port side to the hot water storage tank 10 side, and a pressure reducing valve V10 are disposed in the pipe L11.

  Further, one end of the pipe L21 is connected to the upper part of the hot water storage tank 10, and the other end of the pipe L21 is connected to one input side of the hot water mixing valve V4. A check valve 21 that allows only a flow from the hot water storage tank 10 side to the hot water mixing valve V4 side is disposed near the hot water mixing valve V4 of the pipe L21.

  One end of the branch pipe L12 is connected to the other input side of the hot water mixing valve V4, and the other end of the branch pipe L12 is connected to the downstream side of the pressure reducing valve V10 of the pipe L11. A check valve 22 that allows only a flow from the water supply port side to the hot water mixing valve V4 side is disposed near the hot water mixing valve V4 of the branch pipe L12.

  One end of the pipe L22 is connected to the output side of the hot water mixing valve V4, and the other end of the pipe L22 is connected to the hot water supply port 9a of the connection adapter 9 provided in the bathtub 3. In order from the hot water mixing valve V4 side, the hot water electromagnetic valve V6, the check valve 5 that allows only the flow from the hot water mixing valve V4 side to the bathtub 3 side, the water amount sensor 6, and the hot water mixing valve V4 side And a check valve 7 that allows only the flow to the bathtub 3 side is provided in the pipe L22.

  Between the check valve 5 and the water amount sensor 6 of the pipe L22, one end of a drain pipe L42 provided with a drain valve V7 is connected. Further, one end of a drainage pipe 41 provided with a relief valve 28 is connected to the vicinity of the hot water storage tank 10 of the pipe L21.

  The water filling electromagnetic valve V6, the check valve 5, the water amount sensor 6 and the check valve 7 constitute a composite water valve 30.

  As shown by a thick line in FIG. 4, the pipe L21, the hot water mixing valve V4, the pipe L22, and the composite water valve 30 constitute a bath hot water supply circuit C2 between the hot water storage tank 10 and the bathtub 3.

<Bath circulation circuit>
One end of the pipe L24 is connected to the water inlet 9b of the connection adapter 9, and the other end of the pipe L24 is connected to the secondary side input of the bath heat exchanger 20. A circulation pump P2 for bath is arranged in the pipe L24. Further, one end of the branch pipe L23 is connected to the downstream side of the composite water valve 30 of the pipe L22, and the other end of the branch pipe L23 is connected to the secondary side output of the bath heat exchanger 20.

  The hot water in the bathtub 3 is circulated through the pipe L24, the bath heat exchanger 20 (secondary side), the branch pipe L23, and a part of the pipe L22 by the bath circulation pump P2.

  As shown by the thick line in the lower right of FIGS. 5 and 6, the bath circulation circuit C6 is constituted by the pipe L24, the bath heat exchanger 20 (secondary side), the branch pipe L23, the pipe L22, and the bath circulation pump P2. It is configured.

  The hot water solenoid valve V6 is an open / close valve that opens and closes a flow path through which hot water in the hot water storage tank 10 flows into the bathtub 3 via a bath circulation circuit.

<Turning circuit>
Further, one end of the branch pipe L25 is connected upstream of the composite water valve 30 of the pipe L22, and the other end of the branch pipe L25 is connected to the input of the bath heat exchanger 20 (primary side). One end of the pipe L26 is connected to the output of the bath heat exchanger 20 (primary side), and the other end of the pipe L26 is connected to the other input side of the pump inlet three-way valve V1.

  The reheating circuit C3 corresponds to a bath heat exchange circuit that circulates and connects between the hot water storage tank 10 and the bath heat exchanger 20 (primary side), and the bath heat exchanger 20 (1 It is connected to the lower part of the hot water storage tank 10 via the next side.

  As shown by the thick line in the upper left in FIG. 5, the pipe L21, the hot water mixing valve V4, a part of the pipe L22, the branch pipe L25, the bath heat exchanger 20 (primary side), the pipe L26, and the pump water three-way valve A reheating circuit C3 is constituted by V1, a pipe L2, a bypass valve V2, a pipe L6, a part of the pipe L4, the boiling three-way valve V3, the pipe L7 and the boiling circulation pump P1.

<Hot water supply circuit>
Further, one end of the pipe L31 is connected to the upper part of the hot water storage tank 10, and the other end of the pipe L31 is connected to one input side of the hot water supply mixing valve V5. A check valve 23 that allows only the flow from the hot water storage tank 10 side to the hot water supply mixing valve V5 side is disposed in the pipe L31.

  Further, one end of the branch pipe L13 is connected to the water supply port side of the branch pipe L12 in the vicinity of the check valve 22, and the other end of the branch pipe L13 is connected to the other input side of the hot water supply mixing valve V5. A check valve 24 that allows only the flow from the water supply port side to the hot water supply mixing valve V5 side is disposed in the vicinity of the hot water supply mixing valve V5 of the branch pipe L13.

  One end of the pipe L32 is connected to the output side of the hot water mixing valve V5, and the other end of the pipe L32 is connected to the hot water supply section 26 (a faucet in this embodiment). A water amount sensor 25 is provided in the pipe L32.

  As shown by a thick line in FIG. 7, a hot water supply circuit C5 is configured by the pipe L31, the hot water supply mixing valve V5, the pipe L32, the pipe L11, a part of the branch pipe L12, and the branch pipe L13.

<Bath cooling circuit>
The bath cooling circuit C4 corresponds to a bath heat exchange circuit that circulates and connects between the hot water storage tank 10 and the bath heat exchanger 20 (primary side), and the bath heat exchanger 20 (1 It is connected to the lower part of the hot water storage tank 10 via the next side.

  As shown by the thick lines from the lower left to the upper right of FIG. 6, the pipe L11, the branch pipe L12, the hot water mixing valve V4, a part of the pipe L22, the branch pipe L25, the bath heat exchanger 20 (primary side), the pipe L26 The bath cooling circuit C4 is constituted by the pump inlet three-way valve V1, the pipe L2, the circulating pump P1 for the boiling, the bypass valve V2, the pipe L6, a part of the pipe L4, the boiling three-way valve V3 and the pipe L7.

<Temperature sensor group>
The hot water storage tank 10 is provided with six temperature sensors T1 to T6 at substantially equal intervals from the lower side to the upper side. Further, a temperature sensor T11 for detecting the feed water temperature is provided on the upstream side in the vicinity of the connection point between the branch pipe L12 and the branch pipe L13. In addition, a temperature sensor T <b> 12 that detects a hot water supply temperature is provided downstream of the water amount sensor 25 in the pipe L <b> 32 connected to the hot water supply unit 26.

  Further, in the pipe L24, between the connection adapter 9 on the bathtub 3 side and the circulation pump P2 for the bath, in order from the connection adapter 9 side, a water level sensor LS, a water flow switch SW as an example of a water flow sensor, A temperature sensor T13 is provided.

  Furthermore, a temperature sensor T14 for detecting the temperature of hot water supplied to the bathtub 3 is provided at a connection point between the pipe L22 and the branch pipe L23.

  Moreover, the incoming water temperature sensor T21 which detects the incoming water temperature of the incoming water to the boiling heat exchanger 2a is provided in the pipe L3.

  Furthermore, a tapping temperature sensor T22 for detecting a tapping temperature of the return water from the boiling heat exchanger 2a is provided in the pipe L4.

The heat pump unit 2 includes an outside air temperature sensor T23 that detects the outside air temperature. In addition, the heat pump unit 2 uses carbon dioxide (CO ₂ ) as a refrigerant, and can control the tapping temperature within a range of 65 ° C. to 90 ° C., for example.

  The piping L2 is a common piping portion in which the boiling circuit C1 and the reheating circuit C3 are partially in common, and a heating circulation pump P1 for circulating the boiling circuit C1 and the reheating circuit C3 is connected to the piping L2. It is arranged. A pump inlet three-way valve V1 is disposed on the upstream side of the pipe L2. The pump incoming three-way valve V1 switches between the circulation of water or hot water in the boiling circuit C1 and the circulation of water or hot water in the reheating circuit C3.

<Control unit>
As shown in FIG. 2, the hot water storage unit 1 includes a control unit 100 including a microcomputer (CPU) and an input / output circuit. The control unit 100 performs transmission / reception with the remote controller 200. The control unit 100 includes temperature sensors T1 to T6, T11 to T14, a water level sensor LS, a water flow switch SW, water amount sensors 6 and 25, an incoming water temperature sensor T21, a hot water temperature sensor T22, an outside air temperature sensor T23, and a remote controller 200. In response to the signal, the heat pump unit 2, the boiling circulation pump P1, the bath circulation pump P2, the pump inlet three-way valve V1, the bypass valve V2, the boiling three-way valve V3, the hot water mixing valve V4, the hot water mixing valve V5 and hot water. The tension solenoid valve V6 and the like are controlled.

  Moreover, the said control part 100 has the boiling-up control part 100a, the bath hot water supply control part 100b, the reheating control part 100c, the bath cooling control part 100d, and the hot water supply control part 100e. The boiling control unit 100a controls the operation of the boiling circuit C1. The bath water heater control unit 100b controls the operation of the bath water heater circuit C2. The chasing control unit 100c controls the operation of the chasing circuit C3. The bath cooling control unit 100d controls the operation of the bath cooling circuit C4. The hot water supply control unit 100e controls the operation of the hot water supply circuit C5.

  Further, the control unit 100 has a memory (for example, ROM, RAM, EEPROM, etc.), and a predetermined control program and various past operation history data and state data are stored in the memory. In addition, power charge setting information for each time zone (daytime charge, late-night charge, etc.) of the day is stored in advance.

<Circulating pump for boiling>
The boiling circulation pump P1 is, for example, a pulse width modulation (PWM) control type DC pump driven by a direct current motor and capable of adjusting the capacity by changing the duty ratio and drive frequency of the drive signal. is there. The motor of the circulating pump P1 for boiling includes a rotation sensor that detects the number of rotations (rotation speed). The motor of the circulating pump P1 for boiling has a characteristic that the rotational speed can be controlled and the input changes according to the pump load. When the duty ratio is large or the driving frequency is high, the electric power supplied to the motor is increased and the pump rotation speed is increased. When the duty ratio is small or the drive frequency is low, the electric power supplied to the motor becomes small and the pump rotation speed decreases.

  The motor of the circulating pump P1 for boiling is controlled by the control unit 100 so as to rotate at the maximum rotational speed during the air venting operation described later. By this control, the work time required for the air venting operation can be shortened. During air venting operation, if air remains in the pipe, the pump load of the circulating pump P1 for boiling is reduced and the air is drained from the pipe to become only water in the pipe. Therefore, the pump load of the circulating pump P1 for boiling Becomes larger. In addition, the kind and control system of the motor of the circulating pump P1 for boiling and the circulating pump P2 for the bath in the present invention are not limited to the above, and various kinds and systems can be applied. The bath circulation pump P2 is the same as the boiling circulation pump P1.

[Boiling operation]
In the hot water supply device WH having the above-described configuration, in the “boiling operation” in which the hot water in the hot water storage tank 10 is boiled by the heat pump unit 2, as shown in FIG. 3, the pump water three-way valve V1 is connected to the pipe L1 and the pipe L2. Switching to one position, the bypass valve V2 is switched to one position where the pipe L2 and the pipe L3 communicate. Further, the boiling three-way valve V3 is switched to one position where the pipe L4 and the pipe L5 communicate with each other.

  Then, the boiling circulation pump P1 is operated, and via the boiling circuit C1, that is, the pipe L1, the pump water three-way valve V1, the pipe L2, the bypass valve V2, the pipe L3, the boiling heat exchanger 2a, the pipe L4. The hot water in the hot water storage tank 10 is circulated through the boiling three-way valve V3 and the pipe L5 (or L7).

  The boiling control unit 100a of the control unit 100 controls the heat pump unit 2 so that the tapping temperature of the heat pump unit 2 becomes the target tapping temperature TS during the boiling operation. Here, the target hot water temperature TS is calculated by the boiling control unit 100a based on the amount of hot water supplied from the hot water storage tank 10 or the like. For example, when the amount of hot water used is large, the target hot water temperature TS is as high as 85 ° C., for example, and when the amount of hot water used is small, the target hot water temperature TS is as low as 65 ° C., for example.

[Bath hot water operation]
When performing a “bath hot water supply operation” in which hot water is supplied from the hot water storage tank 10 into the bathtub 3, as shown in FIG. 4, when the hot water solenoid valve V 6 is opened by the hot water supply control unit 100 b of the control unit 100, the hot water storage tank 10. The hot water in the upper part is supplied into the bathtub 3 through the pipe L21, the hot water mixing valve V4, and the pipe L22. At this time, the hot water supply controller 100b controls the hot water mixing valve V4 to mix hot hot water from the hot water storage tank 10 and water from the water supply port based on the target set temperature. When the water level in the bathtub 3 detected by the water level sensor LS reaches the set water level, the hot water solenoid valve V6 is closed by the bath hot water supply control unit 100b.

  In the “bath hot water supply operation”, when the bath automatic operation mode in which the set water level and the set temperature are automatically maintained is selected by the operation of the remote controller 200, hot water is supplied from the hot water storage tank 10 into the bath tub 3. After executing the “bath hot water supply operation”, the “bath monitoring operation” is performed in which the hot water surface level in the bathtub 3 is maintained at the set water level and the hot water temperature is maintained at the set temperature.

[Casting driving]
Next, in the case of performing a “refreshing operation” in which hot water in the bath tub 3 is heated and repelled, as shown in FIG. 5, the replenishment control unit 100 c of the control unit 100 performs the pump water entry three-way valve V <b> 1. Is switched to the other position where the pipe L26 and the pipe L2 are communicated, and the bypass valve V2 is switched to the other position where the pipe L2 and the pipe L6 are communicated. The reheating controller 100c further switches the boiling three-way valve V3 to the other position where the pipe L6 and the pipe L7 communicate with each other.

  Then, with the opening degree of the hot water mixing valve V4 fully opened to the hot water side, the boiling circulation pump P1 is operated and the recirculation circuit C3, that is, the pipe L21, the hot water mixing valve. V4, a part of pipe L22, branch pipe L25, bath heat exchanger 20 (primary side), pipe L26, pump water three-way valve V1, pipe L2, pipe L6, part of pipe L4 and pipe L7 The upper hot water in the hot water storage tank 10 is circulated. At this time, the bath circulation pump P2 is operated to circulate hot water in the bathtub 3 through the pipe L24, the bath heat exchanger 20 (secondary side), the branch pipe L23, and a part of the pipe L22. Thereby, the hot water of the bathtub 3 side is heated by the bath heat exchanger 20, and a reheating is performed.

[Bath cooling operation]
Next, when performing a “bath cooling operation” in which the hot water in the bath tub 3 is cooled to make the temperature of the lukewarm water, as shown in FIG. The three-way valve V1 is switched to the other position where the pipe L26 and the pipe L2 communicate, and the bypass valve V2 is switched to the other position where the pipe L2 and the pipe L6 communicate. The bath cooling control unit 100d further switches the boiling three-way valve V3 to the other position where the pipe L6 and the pipe L7 communicate with each other.

  Then, in a state where the opening degree of the hot water filling valve V4 is fully opened to the water side, the boiling circulation pump P1 is operated, and a part of the pipe L11 is branched via the bath cooling circuit C4. Pipe L12, hot water mixing valve V4, part of pipe L22, branch pipe L25, bath heat exchanger 20 (primary side), pipe L26, pump water three-way valve V1, pipe L2, pipe L6, part of pipe L4 And the water of the lower part in the hot water storage tank 10 is circulated through the piping L7. At this time, the bath circulation pump P2 is operated to circulate hot water in the bathtub 3 through the pipe L24, the bath heat exchanger 20 (secondary side), the branch pipe L23, and a part of the pipe L22. Thereby, the hot water on the bathtub 3 side is cooled by the bath heat exchanger 20, and the hot water temperature becomes lukewarm.

  In this “bath cooling operation”, the bath temperature is lowered by 2 ° C. and held for a predetermined time (in this embodiment, 10 minutes), for example, without changing the bath set temperature by operating the remote controller 200, and then the bath The temperature of the hot water on the 3 side is returned to the bath set temperature.

[Hot water operation]
Further, when performing a “hot water supply operation” in which hot water is supplied from the hot water supply unit 26, when the faucet of the hot water supply unit 26 is opened, water from the water supply port is supplied via the pipe L11 by the water supply pressure as shown in FIG. It is supplied into the hot water storage tank 10 from the lower part of the hot water storage tank 10. Thereby, high temperature hot water is extruded from the upper part in the hot water storage tank 10 through the pipe L31.

  Then, hot water is supplied from the upper part of the hot water storage tank 10 to one input side of the hot water supply mixing valve V5 through the pipe L31, and water from the water supply port is part of the pipe L11, the branch pipe L12, and It is supplied to the other input side (water side) of the hot water supply mixing valve V5 through a part of the branch pipe L13.

  Here, hot water in the upper part of the hot water storage tank 10 and water from the water supply port are mixed by the hot water supply mixing valve V5, and then discharged from the hot water supply unit 26 through the pipe L32. At this time, the hot water supply control unit 100e of the control unit 100 sets the mixing ratio of hot water and water in the hot water supply mixing valve V5 so that the hot water supply temperature detected by the temperature sensor T12 becomes the set hot water supply temperature in the “hot water supply operation”. Control.

(Air venting operation)
With reference to FIGS. 3, 5, 7 and 8, the air venting operation of the first embodiment in the water heater WH having the above-described configuration will be described.

  In the test operation after the installation is completed, the hot water storage tank 10 is filled with water from the water supply port as the start of the air venting operation. That is, with the relief valve 28 opened, water is supplied from the water supply port to the lower side of the hot water storage tank 10 through the strainer 11, the check valve 12, and the pressure reducing valve V10 to fill the hot water storage tank 10 with water. The water overflowing when the hot water storage tank 10 is full flows out from the relief valve 28 to the outside.

  Thereafter, the relief valve 28 is closed, and as shown in FIG. 5, the control unit 100 switches the input side of the pump water inlet three-way valve V1 to the retreat circuit side (the pipe L2 side at the other position) (step S11). The boiling circulation pump P1 is turned on (step S12), and the system is operated for a first predetermined time. The first predetermined time is, for example, 1 minute. As the water in the hot water storage tank 10 circulates through the reheating circuit C3, the air removal operation of the reheating circuit C3 is executed. In this air venting operation, water is supplied from the pipe L21, the hot water mixing valve V4, a part of the pipe L22, the branch pipe L25, the bath heat exchanger 20 (primary side), the pipe L26, the pump inlet three-way valve V1, the pipe L2, and the like. It flows through a bypass valve V2, a pipe L6, a part of the pipe L4, a boiling three-way valve V3, and a pipe L7. As a result, the air that was in the piping of the reheating circuit C <b> 3 accumulates in the upper part of the hot water storage tank 10.

  Next, as shown in FIG. 3, the control unit 100 switches the input side of the pump inlet three-way valve V1 to the pipe L1 side at one position (step S13), and turns on the circulating pump P1 for boiling for a second predetermined time. It operates and circulates the water in the hot water storage tank 10 through the boiling circuit C1, and executes the air venting operation of the boiling circuit C1. When the second predetermined time has elapsed, the control unit 100 turns off the boiling circulation pump P1 (step S14). The second predetermined time is, for example, 4 minutes. In this air venting operation, the water flows through the pipe L1, the pump incoming three-way valve V1, the pipe L2, the pipe L3, the boiling heat exchanger 2a, the pipe L4, the pump incoming three-way valve V1, the pipe L5, and the hot water storage tank 10. As a result, the air that was in the piping of the boiling circuit C <b> 1 accumulates in the upper part of the hot water storage tank 10.

  As described above, by performing the air venting operation on the reheating circuit C3 and the boiling circuit C1, the air remaining in each pipe of the reheating circuit C3 and the boiling circuit C1 is transferred to the upper part of the hot water storage tank 10. To be collected. If the air venting operation is executed first on the heating circuit C1 side where the pipe length becomes longer and the residual air amount tends to increase, the influence on the air venting operation on the reheating circuit C3 side to be executed later will increase. On the other hand, by performing the air venting operation in the reheating circuit C3 first, the air venting operation on the retreating circuit C3 side is executed smoothly.

  Thereafter, according to the hot water supply circuit C5 shown in FIG. 7, water containing air accumulated in the upper part of the hot water storage tank 10 is discharged. That is, when the faucet of the hot water supply unit 26 is opened, water from the water supply port is supplied into the hot water storage tank 10 from the lower part of the hot water storage tank 10 through the pipe L11 due to the water supply pressure. Thereby, the water containing air is extruded from the upper part in the hot water storage tank 10 through the piping L31. And the control part 100 makes the opening degree of the hot water supply mixing valve V5 fully open at the hot water side, and the water containing air is discharged | emitted from the hot water supply part 26 via the piping L32. This completes the air venting operation.

  According to the air venting operation of the first embodiment, the control unit 100 causes the pump inlet three-way valve V1 (flow path switching valve) to boil from the reheating circuit C3 side after the first predetermined time has elapsed during the air venting operation. Since it is switched to the raising circuit C1 side, the air venting in each pipe in the boiling circuit C1 and the reheating circuit C3 can be executed reliably and quickly.

  With reference to FIGS. 3, 5, 7 and 9, the air venting operation of the second embodiment in the water heater WH having the above-described configuration will be described.

  In the test run after the completion of installation, the hot air tank 10 is first filled with water, starting with the air venting operation. That is, with the relief valve 28 opened, water is supplied from the water supply port to the lower side of the hot water storage tank 10 through the strainer 11, the check valve 12, and the pressure reducing valve V10 to fill the hot water storage tank 10 with water. The water overflowing when the hot water storage tank 10 is full flows out from the relief valve 28 to the outside.

  Thereafter, the relief valve 28 is closed, and the control unit 100 switches the input side of the pump water three-way valve V1 to the retreat circuit C3 side (the pipe L2 side at the other position) as shown in FIG. 5 (step S21). Then, the boiling circulation pump P1 is turned on (step S22), and the boiling circulation pump P1 is operated. As the water in the hot water storage tank 10 circulates through the reheating circuit C3, the air removal operation of the reheating circuit C3 is executed. In this air venting operation, water is supplied from the pipe L21, the hot water mixing valve V4, a part of the pipe L22, the branch pipe L25, the bath heat exchanger 20 (primary side), the pipe L26, the pump inlet three-way valve V1, the pipe L2, and the like. It flows through a bypass valve V2, a pipe L6, a part of the pipe L4, a boiling three-way valve V3, and a pipe L7. As a result, the air that was in the piping of the reheating circuit C <b> 3 accumulates in the upper part of the hot water storage tank 10.

  While the air remains in the piping of the reheating circuit C3, the pump load of the circulating pump P1 for boiling is small, but if air is discharged from the piping of the reheating circuit C3, Is filled only with water, the pump load of the circulating pump P1 for boiling increases. Therefore, when the pump load of the boiling circulation pump P1 starts to increase, it can be considered that air has escaped from the piping of the reheating circuit C3. Therefore, the control unit 100 determines whether or not the pump load of the boiling circulation pump P1 has started to increase (step S23).

  When the control unit 100 determines that the pump load of the circulating pump P1 for boiling has increased, as shown in FIG. 3, the control unit 100 sets the input side of the pump inlet three-way valve V1 to the boiling circuit C1 side (one side). The position is switched to the pipe L1 side (step S24). By the operation of the boiling circulation pump P1, the water in the hot water storage tank 10 circulates through the boiling circuit C1, and the air venting operation of the boiling circuit C1 is executed.

  While the air remains in the piping of the boiling circuit C1, the pump load of the circulating pump P1 for boiling is small, but if air is released from the piping of the boiling circuit C1, the inside of the piping of the boiling circuit C1 Is filled only with water, the pump load of the circulating pump P1 for boiling increases. Therefore, when the pump load of the boiling circulation pump P1 starts to increase, it can be considered that air has escaped from the piping of the boiling circuit C1. Therefore, the control unit 100 determines whether or not the pump load of the boiling circulation pump P1 has started to increase (step S25).

  When the control unit 100 determines that the pump load of the boiling circulation pump P1 has increased, the control unit 100 turns off the boiling circulation pump P1 (step S26). In this air venting operation, water flows through the pipe L1, the pump inlet three-way valve V1, the pipe L2, the pipe L3, the boiling heat exchanger 2a, the pipe L4, the boiling three-way valve V3, the pipe L5, and the hot water storage tank 10. As a result, the air that was in the piping of the boiling circuit C <b> 1 accumulates in the upper part of the hot water storage tank 10.

  As described above, by performing the air venting operation on the reheating circuit C3 and the boiling circuit C1, the air remaining in each pipe of the reheating circuit C3 and the boiling circuit C1 is transferred to the upper part of the hot water storage tank 10. To be collected.

  Thereafter, according to the hot water supply circuit C5 shown in FIG. 7, water containing air accumulated in the upper part of the hot water storage tank 10 is discharged. That is, when the faucet of the hot water supply unit 26 is opened, water from the water supply port is supplied into the hot water storage tank 10 from the lower part of the hot water storage tank 10 through the pipe L11 due to the water supply pressure. Thereby, the water containing air is extruded from the upper part in the hot water storage tank 10 through the piping L31. And the control part 100 makes the opening degree of the hot water supply mixing valve V5 fully open at the hot water side, and the water containing air is discharged | emitted from the hot water supply part 26 via the piping L32. This completes the air venting operation.

  According to the air venting operation of the second embodiment, the control unit 100 causes the pump inlet three-way valve V1 (flow path switching valve) to catch up with the boiling circuit C1 side by the pump load increase determination during the air venting operation. Since it is switched to the circuit C3 side, the air venting in each pipe on the boiling circuit C1 side and the reheating circuit C3 can be executed reliably and quickly.

  Since the piping length on the boiling circuit C1 side varies depending on the installation conditions at the site and the residual air amount is different, the timing of switching the pump inlet three-way valve V1 (flow path switching valve) is different at each site. According to the air venting operation of the second embodiment, the air venting operation can be completed in a short time by switching the pump water three-way valve V1 at an optimal timing.

  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.

  In the air venting operation, the water containing the air accumulated in the upper part of the hot water storage tank 10 is not only discharged from the hot water supply unit 26 according to the hot water supply circuit C5 shown in FIG. 7, but also connected according to the bath hot water supply circuit C2 shown in FIG. May be discharged to the bathtub 3. At this time, in the bath hot water supply circuit C2, the opening degree of the hot water mixing valve V4 is fully opened by the control unit 100.

  In the air venting operation of the first embodiment, the pump water three-way valve V1 (flow path switching valve) is switched once from the reheating circuit C3 side to the boiling circuit C1 side after the first predetermined time has elapsed. The three-way valve V1 (flow path switching valve) can be switched a plurality of times in a time shorter than the first predetermined time and the second predetermined time.

  Further, the control unit 100 controls the pump inlet three-way valve V1 (flow path switching valve) to be switched first to the boiling circuit C1 side and then to the reheating circuit C3 side during the air venting operation. It can also be set as an aspect.

  The air venting operation is not limited to a trial operation by installing the water heater WH. For example, in order not to use the hot water supply device WH for a long period of time, all the water in the hot water storage tank 10 is discharged by setting the two-way drain valve 27 to the drain side with the relief valve 28 open, and then the hot water storage tank The above-described air venting operation is also applied when the interior of 10 is filled again.

  The flow path switching valve that switches between the boiling circuit side and the reheating circuit side during the air venting operation is not limited to a three-way valve, and may be configured by combining two two-way valves, one four-way valve, or the like.

  Although the configuration using the heat pump unit 2 as the heat source has been described, the heat source is not limited to this, and the configuration may be such that the hot water in the hot water storage tank 10 of the hot water storage unit 1 is boiled by another heat source such as a heater or a boiler.

DESCRIPTION OF SYMBOLS 1 ... Hot water storage unit 2 ... Heat pump unit 2a ... Boiling heat exchanger 3 ... Bathtub 5, 7, 12, 21, 22, 23, 24 ... Check valve 6,25 ... Water quantity sensor 9 ... Connection adapter 9a ... Hot water supply port 9b DESCRIPTION OF SYMBOLS ... Water inlet 10 ... Hot water storage tank 11 ... Strainer 20 ... Bath heat exchanger 26 ... Hot water supply part 27 ... Two-way valve for drainage 28 ... Relief valve 30 ... Compound water valve 100 ... Control part 200 ... Remote controller C1 ... Boiling circuit C2 ... Bath hot water supply circuit C3 ... Reheating circuit C4 ... Bath cooling circuit C5 ... Hot water supply circuit C6 ... Bath circulation circuit L1 ... Piping L2 ... Piping (common piping)
L3 to L7, L11 ... piping L12 to L13, L23, L25 ... branch piping L21 to L22, L24, L26 to L27 ... piping L31, L32, L41 ... piping L42 ... drainage piping LS ... water level sensor P1 ... circulating pump for boiling (Circulation pump)
P2 ... Bath circulation pump SW ... Water flow switch T1-T6, T11-T14 ... Temperature sensor T21 ... Incoming water temperature sensor T22 ... Outlet water temperature sensor T23 ... Outside air temperature sensor V1 ... Pump inflow three-way valve (flow path switching valve)
V2 ... Bypass valve V3 ... Boiling three-way valve V4 ... Hot water mixing valve V5 ... Hot water mixing valve V6 ... Hot water solenoid valve V10 ... Pressure reducing valve WH ... Hot water supply device

Claims (4)

A hot water storage tank (10),
A boiling circuit (C1) connected from the lower part of the hot water storage tank (10) to the upper part of the hot water storage tank (10) via a boiling heat exchanger (2a);
A reheating circuit (C3) connected from the upper part of the hot water storage tank (10) to the lower part of the hot water storage tank (10) via a bath heat exchanger (20);
A circulation pump (P1) disposed in a common piping part (L2) in which the boiling circuit (C1) and the reheating circuit (C3) are partially common;
A flow path switching valve (V1) disposed on the upstream side of the common pipe section (L2);
A control unit (100) for controlling the flow path switching valve (V1),
The control unit (100) controls to switch the flow path switching valve (V1) between the boiling circuit (C1) side and the reheating circuit (C3) side during the air venting operation. Hot water supply device. In claim 1,
The controller (100) controls the flow path switching valve (V1) to be switched to the reheating circuit (C1) side after switching the flow path switching valve (V1) to the reheating circuit (C3) side during the air venting operation. A hot water supply apparatus characterized by the above. In claim 1 or claim 2,
The controller (100) controls the circulating pump (P1) to rotate at a maximum rotational speed during the air venting operation. In any one of Claims 1-3,
The controller (100) controls the flow path switching valve (V1) to operate when the pump load of the circulation pump (P1) starts to increase during the air venting operation. Hot water supply device.

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