JP2004020075A - Heat pump type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump type water heater for safely and easily removing, repairing and replacing a part and a pipe on a circulating passage without draining hot water or water in a hot water storage tank. <P>SOLUTION: This heat pump type water heater is provided with a water heater body 1 and a heat pump body 8 as a heating source connected by a cold water pipe 9 and a hot water pipe 10 so as to form the circulating passage with the hot water supply tank 2 internally arranged in this water heater body 1, and is constituted so as to return hot water becoming high temperature hot water by being heated in the heat pump body 8 to an upper part of the hot water storage tank 2 via the hot water pipe 10 by sending water in the heat pump body 8 via the cold water pipe 9 by taking out the water from a lower part of the hot water storage tank 2 by operating a circulating pump 11 arranged in the cold water pipe 9 of the circulating passage. A water cut-off plug 27 is positioned and arranged on the upstream side of the circulating pump 11 of the cold water pipe 9. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat pump water heater that uses a heat pump cycle to heat hot water into a hot water storage tank.
[0002]
[Prior art]
Recently, heat pump water heaters using CO ₂ refrigerant have been known. This water heater has the advantage that the boiling temperature can be heated to a high temperature of 90 ° C. or higher, and the heating efficiency is high.
[0003]
FIG. 4 is a configuration diagram of a conventional heat pump water heater, and FIG. 5 is a configuration diagram of the heat pump body.
In FIG. 4, reference numeral 1 denotes a water heater main body, 2 denotes a hot water storage tank disposed in a case 1 a of the main body 1, 3 denotes a water supply pipe connected to a lower portion of the hot water storage tank 2, and 4 denotes a water supply pipe 3. The provided pressure reducing valve, 5 is a hot water supply pipe connected to the upper part of the hot water storage tank 2, 6 is a relief valve, 7 is attached to the outer wall surface of the hot water storage tank 2, and detects the temperature of water in the hot water storage tank 2. By attaching the temperature sensor A to a position of a predetermined capacity on the outer wall surface of the hot water storage tank 2, the amount of remaining hot water in the hot water storage tank 2 is also detected from the detected temperature at the mounting position. 8 is a heat pump body, 9 is a cold water pipe connecting the lower part of the hot water storage tank 2 and the heat pump body 8, 10 is a hot water pipe connecting the upper part of the hot water storage tank 2 and the heat pump body 8, and 11 is provided on the cold water pipe 9. And a circulation pump for circulating water in the hot water storage tank 2 between the heat pump main body 8 and the cold water pipe 9 and the hot water pipe 10. Reference numeral 12 denotes a temperature sensor B for detecting a temperature for stopping the heating operation of the heat pump body 8.
[0004]
A control unit 13 starts / stops and circulates a heating operation to the heat pump main body 8 based on the detection values of the temperature sensors A7 and B12 and the input value from an operation unit 14 for setting a boiling temperature and the like. The operation of the pump 11 is controlled. Reference numeral 15 denotes a water stopcock provided on the water supply pipe 3 which is opened and closed by manual operation, and 16 denotes a water stopcock provided on the drain pipe 17 which is also opened and closed by manual operation.
[0005]
In FIG. 5, the heat pump cycle of the heat pump body 8 is configured by connecting a compressor 18, a hot-water storage heat exchanger 19, an expansion valve 20, an outdoor heat exchanger 21, and an accumulator 22 in order through a refrigerant pipe 23. Here, a blower fan 24 is attached to the outdoor heat exchanger 21 to absorb heat, and the hot water storage heat exchanger 19 exchanges heat between the high-pressure gas refrigerant discharged from the compressor 18 and water for hot water supply. It has a refrigerant passage 19a through which the refrigerant flows and a hot water storage water passage 19b through which the hot water flows.
[0006]
In the heat pump water heater having the above configuration, water is supplied to the heat exchanger 19 for hot water storage of the heat pump body 8 by the circulation pump 11 from the cold water pipe 9 connected to the lower portion of the hot water storage tank 2, and the heat exchange for hot water storage is performed. The heat is exchanged by the vessel 19 to become high-temperature hot water, and the hot water is returned from the hot water pipe 10 to the upper portion of the hot water storage tank 2 and stored in the upper portion of the hot water storage tank 2.
[0007]
In this conventional configuration, for example, when the circulating pump 11 is out of order for repairing, the water supply stopcock 15 is first closed to stop water supply, and then the drainage stopcock 16 is opened to store hot water. After the hot water in the tank 2 is completely drained and the inside of the hot water storage tank 2 is emptied, the circulating pump 11 is removed to replace or repair parts. Also, when a part of the cold water pipe 9 or the hot water pipe 10 is replaced, the hot water in the hot water storage tank 2 is completely drained in the same procedure as described above, and then the parts are replaced or repaired.
[0008]
FIG. 6 is a configuration diagram showing another example of a conventional heat pump water heater. A bypass pipe 26 is connected through a three-way valve 25 for anti-freezing operation between the hot water pipe 10 and the upstream side of the circulation pump 11 of the cold water pipe 9. The configuration is the same as that of FIG.
According to this configuration, when the outside air temperature decreases and the cold water pipe 9 and the hot water pipe 10 are likely to be frozen, the flow path is switched by the three-way valve 25 for freezing prevention operation, Using the hot water in the hot water storage tank 2 by circulating through the bypass pipe 26 between the cold water pipe 9, the hot water storage heat exchanger 19 of the heat pump main body 8, and the hot water pipe 10 and heating the heat pump main body 8. Also, the freezing of the cold water pipe 9 and the hot water pipe 10 can be prevented without installing a freezing prevention heater or the like separately.
[0009]
In the configuration shown in FIG. 6, for example, when the circulating pump 11 or the three-way valve 25 for freezing prevention operation is repaired due to a failure, the operation is exactly the same as that in FIG. 4. After closing and stopping the water supply, the drain stop cock 16 is then opened, and all the water in the hot water storage tank 2 is drained and the circulation pump 11 is removed after the hot water storage tank 2 is emptied. Make repairs. Also, when a part of the cold water pipe 9 or the hot water pipe 10 is replaced, the hot water in the hot water storage tank 2 is completely drained and the replacement operation is performed in exactly the same procedure as described above.
[0010]
[Problems to be solved by the invention]
As described above, the conventional heat pump water heater has to drain all the hot water or water in the hot water storage tank 2 when parts in the circulation circuit such as the circulation pump 11 and the three-way valve 25 for anti-freezing operation fail. In addition, there is a problem that hot water in the hot water storage tank 2 is wasted because the failed component or the pipe cannot be replaced or repaired.
[0011]
The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a heat pump water heater capable of replacing or repairing parts without draining hot water in a hot water storage tank. .
[0012]
[Means for Solving the Problems]
A heat pump water heater according to claim 1 of the present invention includes a water heater main body, a heat pump main body as a heating source, a hot water storage tank provided in the water heater main body, and a hot water storage heat provided in the heat pump main body. The exchanger is connected to the cold water pipe and the hot water pipe to form a circulation circuit, and a circulation pump provided in the cold water pipe of the circulation circuit is operated to take out low-temperature water from the lower part of the hot water storage tank and pass through the cold water pipe. In the heat pump water heater configured to send to a hot water storage heat exchanger in the heat pump body and return hot water heated by the hot water storage heat exchanger to a high temperature through the hot water pipe to an upper portion of the hot water storage tank, The cold water pipe upstream of the pump is provided with a water stopcock that is manually opened and closed.
[0013]
A heat pump water heater according to claim 2 of the present invention includes a water heater main body and a heat pump main body as a heating source, and a hot water storage tank provided in the water heater main body and a hot water storage provided in the heat pump main body. The heat exchanger is connected to the cold water pipe and the hot water pipe to form a circulation circuit, and a circulation pump provided in the cold water pipe of the circulation circuit is operated to take out low-temperature water from the lower part of the hot water storage tank, and It is configured to be sent to a hot water storage heat exchanger in the heat pump main body through a pipe, and to return hot water heated by the hot water storage heat exchanger to a high temperature through the hot water pipe to an upper part of the hot water storage tank, and the circulation pump Also, the middle of the cold water pipe on the upstream side and the hot water pipe is connected by a bypass pipe via a valve, and when the outside air temperature decreases and there is a possibility of freezing, the valve is opened to open the hot water storage tank. In a heat pump water heater configured so that the circulation pump can be operated to circulate the water in the cold water pipe and the hot water pipe to the heat exchanger for hot water storage, the heat pump water heater located upstream of the connection part of the bypass pipe. A cold water pipe is provided with a water stopcock which can be opened and closed by manual operation.
[0014]
In the heat pump water heater according to a third aspect of the present invention, in the above configuration, the water stopcock is stored in a case of the water heater main body.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a heat pump water heater according to Embodiment 1 of the present invention.
4, the same reference numerals as those in FIG. 4 denote the same or corresponding parts, and the description thereof will be omitted. Only different points will be described. The configuration of the heat pump body is the same as the conventional configuration shown in FIG.
In FIG. 1, reference numeral 27 denotes a water stopcock attached to the cold water pipe 9 and opened and closed by manual operation, provided upstream of the circulation pump 11, and located at a lower part of the hot water storage tank 2 so as to be located at the lower part of the hot water storage tank 2. In the case 1a.
[0016]
Next, the operation of the first embodiment having the above configuration will be described.
The supply of water into the hot water storage tank 2 is reduced to a constant pressure by a pressure reducing valve 4 from a water supply pipe 3 and filled. The water supplied into the hot water storage tank 2 is sent from the cold water pipe 9 to the heat pump body 8 by the circulation pump 11 and is heated. The heated hot water that has been heated to a high temperature is returned to the upper portion of the hot water storage tank 2 through the hot water pipe 10 and stored. The water in the hot water storage tank 2 expands when heated, and the expanded amount is discharged from the relief valve 6 to prevent the internal pressure of the hot water storage tank 2 from rising. A temperature sensor A7 attached to a predetermined position on the outer wall surface of the hot water storage tank 2 detects the temperature of the hot water in the hot water storage tank 2, and the control unit 13 receives a detection signal from the temperature sensor A7, and Judge the amount of hot water. The temperature sensor B12 detects the temperature of water passing through the cold water pipe 9 connected to the lower part of the hot water storage tank 2, and the control unit 13 receives the detection signal from the temperature sensor B11 and all the water in the hot water storage tank 2 is heated. When the determination is made, the heating operation of the heat pump body 8 is stopped.
[0017]
Next, a case will be described in which the circulating pump 11 breaks down and is repaired in the configuration of the first embodiment.
When replacing or repairing parts due to the failure of the circulation pump 11, first, the water supply stop cock 15 is closed to stop the water supply, and then the case 1 a of the water heater main body 1 is disassembled to remove the hot water storage tank 2. By closing the water stopcock 27 attached to the cold water pipe 9 located at the bottom by manual operation, the hot water or water in the hot water storage tank 2 stops flowing to the circulation pump 11 side, and the hot water or water in the hot water storage tank 2 With the water remaining, the circulating pump 7 can be removed to replace or repair parts.
[0018]
Therefore, it is possible to solve the problem that the failed component cannot be replaced or repaired unless all the hot water and water in the hot water storage tank 2 are drained as in the related art. Also, when a part of the cold water pipe 9 or the hot water pipe 10 is replaced, the replacement operation can be performed without draining the hot water in the hot water storage tank 2 in exactly the same procedure as described above.
[0019]
Furthermore, since the water stopcock 27 is stored in the case 1a of the water heater main body 1, the user cannot normally operate the water stopcock 27, and only a person having service technology can open and close the water stopcock 27. Only when the circulating pump 11 or the like needs to be replaced or repaired due to failure of the circulating pump 11 or the like, the case 1a can be disassembled and operated only when the user operates the water stopcock 21 carelessly. It is possible to prevent the equipment from stopping due to the operation of the safety device.
[0020]
As described above, according to the first embodiment, the provision of the water stopcock 27 that is manually opened and closed in the chilled water pipe 9 upstream of the circulation pump 11 causes a failure of a component in the circulation circuit. By closing the water stopcock 27, pipes and parts can be replaced without draining hot water or water in the hot water storage tank 2 at all.
[0021]
Embodiment 2 FIG.
FIG. 2 is a configuration diagram of a heat pump water heater according to Embodiment 2 of the present invention.
In the second embodiment, the water stopcock 27 that is opened and closed by manual operation is connected to the connection G of the bypass pipe 26 that connects the cold water pipe 9 and the hot water pipe 10 on the upstream side of the circulation pump 11. It is located on the hot water storage tank 2 side and attached to the cold water pipe 9. The configuration of the heat pump body 8 in the second embodiment is the same as the conventional configuration shown in FIG. 5, and the basic configuration of the heat pump water heater is almost the same as the conventional configuration shown in FIG. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.
[0022]
In the configuration of the second embodiment, when the circulating pump 11 or the three-way valve 25 for freezing prevention operation is repaired due to a failure, the water supply stop cock 15 is manually closed to stop the water supply. Disassembling the case 1a of the main body 1 and manually closing the water stopcock 27 attached to the cold water pipe 9 located at the lower part of the hot water storage tank 2, thereby draining the hot water or water in the hot water storage tank 2. In addition, the circulating pump 11 and the three-way valve 25 can be removed and repaired, and the water stopcock 27 is stored in the case 1a of the water heater main body 1, so that the user can inadvertently stop the water stopcock. It is possible to prevent the occurrence of a trouble of the device due to the operation of the device 21 or the stop of the function of the device due to the operation of the safety device, and the same effect as that of the first embodiment can be obtained.
[0023]
Embodiment 3 FIG.
FIG. 3 is a configuration diagram of a heat pump water heater according to Embodiment 3 of the present invention.
In the third embodiment, a part of the water supply pipe 3 connected to the lower part of the hot water storage tank 2 and a part of the cold water pipe 9 also connected to the lower part of the hot water storage tank 2 are connected by one lower pipe 28. The other configuration is the same as that of the second embodiment shown in FIG.
In the configuration of the third embodiment, the same effects as those of the second embodiment are obtained, and a part of the water supply pipe 3 connected to the lower part of the hot water storage tank 2 and a part of the cold water pipe 9 are connected to each other by one. By sharing the lower pipe 28, the number of pipes below the hot water storage tank 2 can be reduced, and the effects of simplification of the configuration and cost reduction can be obtained.
[0024]
In the second and third embodiments, the case where the bypass pipe 26 is connected to the hot water pipe 10 via the three-way valve 25 for preventing freezing has been described as an example, but the present invention is limited to this configuration. Instead, an on-off valve may be directly connected in the middle of the bypass pipe 26.
[0025]
【The invention's effect】
As described above, according to the heat pump water heater of claims 1 and 2 according to the present invention, parts such as a circulating pump and an antifreeze operation valve provided in the circulating circuit break down or a part of the piping is damaged. When replacing, hot water and water in the hot water storage tank must be completely drained to solve the conventional problem that failed parts and some pipes cannot be replaced, and wasteful drainage of hot water in the hot water storage tank No parts can be replaced or repaired. In addition, since the water stopcock is stored in the case of the water heater body, it cannot be used usually by the user, and can be operated only by those who have service technology, so the user is not careless The operation of the water stopcock does not cause the trouble of the equipment or the operation of the safety device to stop the function of the equipment.
[0026]
According to the heat pump water heater of the third aspect of the present invention, the water supply pipe connected to the lower part of the hot water storage tank and a part of the cold water pipe are shared by the same one pipe. The number of pipings can be reduced, and the effect of simplifying the piping configuration and reducing costs can be obtained.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a heat pump water heater according to Embodiment 1 of the present invention.
FIG. 2 is a configuration diagram of a heat pump water heater according to Embodiment 2 of the present invention.
FIG. 3 is a configuration diagram of a heat pump water heater according to a third embodiment of the present invention.
FIG. 4 is a configuration diagram of a conventional heat pump water heater.
FIG. 5 is a configuration diagram of a conventional heat pump body.
FIG. 6 is a configuration diagram showing another example of a conventional heat pump water heater.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot water heater main body, 1a case, 2 hot water storage tanks, 3 water supply piping, 5 hot water supply piping, 8 heat pump main body, 9 cold water piping, 10 hot water piping, 25 three-way valve for anti-freezing operation, 26 bypass pipe, 27 stopcock, 28 Common piping, G connection.

Claims (3)

A water heater body and a heat pump body as a heating source are provided, and a hot water storage tank provided in the water heater body and a hot water storage heat exchanger provided in the heat pump body are connected by a cold water pipe and a hot water pipe. A circulation circuit is formed, a circulation pump provided in the cold water pipe of the circulation circuit is operated to take out low-temperature water from the lower part of the hot water storage tank, and is sent to the hot water storage heat exchanger in the heat pump main body through the cold water pipe. In a heat pump water heater configured to return hot water heated to a high temperature by the hot water storage heat exchanger to the upper portion of the hot water storage tank through the hot water pipe, the cold water pipe upstream of the circulation pump is manually opened and closed. A heat pump water heater characterized in that a water stopcock is provided. A water heater body and a heat pump body as a heating source are provided, and a hot water storage tank provided in the water heater body and a hot water storage heat exchanger provided in the heat pump body are connected by a cold water pipe and a hot water pipe. A circulation circuit is formed, a circulation pump provided in the cold water pipe of the circulation circuit is operated to take out low-temperature water from the lower part of the hot water storage tank, and is sent to the hot water storage heat exchanger in the heat pump main body through the cold water pipe. Hot water heated by the hot water storage heat exchanger and heated to a high temperature is returned to the upper part of the hot water storage tank through the hot water pipe, and a middle portion of the cold water pipe and the hot water pipe upstream of the circulation pump is provided through a valve. When the outside air temperature drops and there is a risk of freezing, open the valve and operate the circulating pump without going through the hot water storage tank to connect the water in the cold water pipe and hot water pipe. In a heat pump water heater configured to be able to circulate through a hot water storage heat exchanger, a water stopcock that is manually opened and closed is provided in a cold water pipe upstream of a connection portion of the bypass pipe. Heat pump water heater. The heat pump water heater according to claim 1, wherein the water stopcock is housed in a case of the water heater main body.

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