JP2020071002A - Heat pump device - Google Patents

Abstract

To provide a heat pump device capable of preventing a region where vacuum suction is not performed or a refrigerant is not injected from being provided in a circuit.SOLUTION: A heat pump device 10 in which a service port 34 is provided in a circuit 15 formed by connecting a compressor 11, a first heat exchanger 12, a pressure reduction valve 13 and a second heat exchanger 14 includes: solenoid valves 23, 24, 25, 31, 32 that are brought into a restricted state for restricting a flow of fluid in the circuit 15 in the non-energized state and brought into a non-restricted state for preventing restriction of a flow of the fluid in the circuit 15 in the energized state; control means 40 for switching the solenoid valves 23, 24, 25, 31, 32 between the restricted state and the non-restricted state; and an input section 42 connected to the control means 40. The control means 40 detects the fact that predetermined input has been performed by the input section 42 to forcedly cause the solenoid valves 23, 24, 25, 31, 32 to be brought into the non-restricted state and/or forcedly cause the pressure reduction valves 13, 27 to be brought into the opened state.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat pump device that constitutes a heat pump cycle.

A heat pump device circulates a refrigerant in a circulation circuit that connects a compressor, a heat exchanger, a pressure reducing valve, and a heat exchanger to take in heat from the outside air or radiate it to the outside air to adjust the indoor temperature and store hot water. Boil the water. A service port is provided in the circulation circuit, and when the refrigerant leaks for some reason, vacuuming or refrigerant injection work is performed from the service port (see Patent Documents 1 and 2). The evacuation and the injection of the refrigerant are usually performed with the main power supply of the heat pump device turned off.

JP, 2011-52842, A JP, 2017-75767, A

In recent years, heat pump devices tend to be required to have additional functions, and the circuits are becoming more complex, such as connecting a plurality of flow paths to a circulation circuit. The inventors of the present application have found that, in a heat pump device having a complicated circuit, there is a region in which the fluid cannot move because the flow of the fluid is restricted by an electromagnetic valve or the like while the main power source of the heat pump device is turned off. We have learned that there is a problem that vacuuming and refrigerant injection cannot be performed in this area.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat pump device that can prevent a region where vacuuming or refrigerant injection is not provided in the circuit.

A heat pump device according to the present invention in accordance with the above object is a heat pump device in which a service port is provided in a circuit connecting a compressor, a first heat exchanger, a pressure reducing valve, and a second heat exchanger,
A solenoid valve that is in a non-restricted state in which the flow of fluid in the circuit is restricted in a non-energized state, and is in a non-restricted state in which the flow of fluid in the circuit is not restricted in an energized state; The control unit includes a control unit that switches a restricted state and an input unit that is connected to the control unit, and the control unit detects that a predetermined input is made by the input unit and forcibly causes the electromagnetic valve to operate. Unrestricted state and / or forced opening of the pressure reducing valve.
Here, the “circuit” includes a circulation circuit that connects the compressor, the first heat exchanger, the pressure reducing valve, and the second heat exchanger, and the circulation circuit has a plurality of flow paths such as a bypass path and a branch path. It refers to a connected road.

In the heat pump device according to the present invention, the control unit detects that a predetermined input is made by the input unit and forcibly sets the solenoid valve to the non-restricted state in which the flow of the fluid in the circuit is not restricted, and / or Since the pressure reducing valve is forcibly opened, it is possible to avoid the formation of a closed region where fluid cannot move in the circuit and to provide a region in the circuit where vacuuming or refrigerant injection is not performed. It can be prevented.

It is a circuit diagram of a heat pump device according to an embodiment of the present invention. It is a block diagram which shows the connection of a control means. It is explanatory drawing of the closed area | region formed in a circuit.

Subsequently, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
As shown in FIG. 1, a heat pump device 10 according to an embodiment of the present invention includes a compressor 11, a heat exchanger 12 (first heat exchanger), a pressure reducing valve 13, a heat exchanger 14 (second heat exchanger). A circuit 15 including a circulation circuit 17 to which a heat exchanger is connected is provided with a service port 34. The details will be described below.

As shown in FIG. 1, the circuit 15 mainly includes a circulation circuit 17 that connects the compressor 11, the heat exchanger 12, the pressure reducing valve 13, the heat exchanger 14, and the four-way valve 16, a bypass passage 18, and a branch passage 19. And the flow path 20. In FIG. 1, the circulation circuit 17 is indicated by a thick line.
The circulation circuit 17, the bypass passage 18, the branch passage 19 and the passage 20 are filled with a refrigerant. The compressor 11 compresses the refrigerant to a high pressure state, and the pressure reducing valve 13 depressurizes the refrigerant. The heat exchangers 12 and 14 are respectively provided in the indoor unit 21 and the outdoor unit 22, the heat exchanger 12 exchanges heat between indoor air and a refrigerant, and the heat exchanger 14 exchanges heat between outside air and a refrigerant. The four-way valve 16 switches the flowing direction of the refrigerant circulating in the circulation circuit 17.

The circulation circuit 17 is provided with electromagnetic valves 23 and 24 between the four-way valve 16 and the heat exchanger 12 and between the heat exchanger 14 and the four-way valve 16, respectively. The solenoid valve 23 can pass a fluid (including a refrigerant, the same applies hereinafter) from the four-way valve 16 side to the heat exchanger 12 side and the opposite direction in the energized state, and the four-way from the heat exchanger 12 side in the de-energized state. The fluid is allowed to pass to the valve 16 side, but the fluid is not passed from the four-way valve 16 side to the heat exchanger 12 side. The solenoid valve 24 can pass fluid from the heat exchanger 14 side to the four-way valve 16 side and the opposite direction in the energized state, and pass fluid from the heat exchanger 14 side to the four-way valve 16 side in the de-energized state. However, the fluid does not pass from the four-way valve 16 side to the heat exchanger 14 side.

The bypass passage 18 has one end connected to a region of the circulation circuit 17 between the discharge side of the compressor 11 and the four-way valve 16 and the other end connected to a region of the circulation circuit 17 between the pressure reducing valve 13 and the heat exchanger 14. Has been done. In the bypass passage 18, an electromagnetic valve 25, a muffler 26 that stores a refrigerant, a pressure reducing valve 27 that decompresses the fluid, and a fluid flow from the other end of the bypass passage 18 toward the pressure reducing valve 27 in order from one end to the other end. A check valve 28 for preventing the above is provided, and a water heat exchanger 29 is connected to a region of the bypass 18 between the electromagnetic valve 25 and the muffler 26. The solenoid valve 25 can pass the fluid from the compressor 11 side to the water heat exchanger 29 side and the opposite direction in the energized state, and the fluid from the water heat exchanger 29 side to the compressor 11 side in the de-energized state. However, the fluid does not pass from the compressor 11 side to the water heat exchanger 29 side.

One end and the other end of the branch passage 19 are connected between the heat exchanger 14 and the electromagnetic valve 24 of the circulation circuit 17 and between the muffler 26 and the pressure reducing valve 27 of the bypass passage 18, respectively. A check valve 30 and a solenoid valve 31 are provided in this order toward the end. The check valve 30 prevents the fluid from flowing from one end side to the other end side of the branch passage 19, and the solenoid valve 31 moves from the check valve 30 side to the other end side of the branch passage 19 and the opposite direction in the energized state. The fluid can pass therethrough, and the fluid can pass from the check valve 30 side to the other end side of the branch passage 19 in the non-energized state, but from the other end side of the branch passage 19 to the check valve 30 side. Does not pass fluid.

One end and the other end of the flow passage 20 are connected between the muffler 26 and the pressure reducing valve 27 of the bypass passage 18 and between the electromagnetic valve 23 and the heat exchanger 12 of the circulation circuit 17, respectively. An electromagnetic valve 32 and a check valve 33 are provided in this order toward the end. The solenoid valve 32 can pass fluid from the check valve 33 side to one end side of the flow path 20 and the opposite direction in the energized state, and from the check valve 33 side to the one end side of the flow path 20 in the non-energized state. However, the fluid does not pass from one end side of the flow path 20 to the check valve 33 side.

Therefore, the solenoid valves 23, 24, 25, 31, 32 are in a restricted state in which the flow of fluid in the circuit 15 is restricted in the non-energized state, and in a non-restricted state in which the flow of fluid in the circuit 15 is not restricted in the energized state. Become.
A service port 34 provided in the outdoor unit 22 is attached between the electromagnetic valve 23 of the circulation circuit 17 and the heat exchanger 12. The service port 34 is an injection port for injecting the refrigerant into the circuit 15, is normally closed, and is opened when injecting the refrigerant or vacuuming.

Further, the water heat exchanger 29 is connected to a boiling water circuit 36 having one end and the other end connected to a lower portion and an upper portion of a hot water storage tank 35 that stores hot water for hot water supply. Water flows into the water heating circuit 36 from the lower portion of the hot water storage tank 35 by the operation of the pump 37 provided in the water heating circuit 36. The water flowing into the hot water boiling circuit 36 is heated by the heat exchanger with the refrigerant flowing through the bypass passage 18 when passing through the water heat exchanger 29, and then flows into the hot water storage tank 35 from the upper portion of the hot water storage tank 35. A water supply pipe 38 and a hot water discharge pipe 39 are connected to the lower part and the upper part of the hot water storage tank 35, respectively.

As shown in FIG. 2, the compressor 11, the pressure reducing valves 13, 27, the four-way valve 16, the solenoid valves 23, 24, 25, 31, 32, and the pump 37 are connected to a control means 40 that can be configured by a microcomputer or the like. ing. The control means 40 operates the compressor 11, the pump 37, opens / closes the pressure reducing valves 13 and 27, and electromagnetic valves 23 and 24 in response to button operations performed by a remote controller 41 capable of wireless communication with the control means 40. The switching between the restricted state and the non-restricted state of 25, 31, 32 is controlled, and the heat exchangers 12, 14 are caused to function as a condenser or an evaporator to perform indoor heating / cooling or boiling of hot water in the hot water storage tank 35. .. A fan 43 that promotes heat exchange by the heat exchanger 14 is connected to the control means 40.

Further, the control means 40 is connected to an input section 42 that receives a predetermined input before evacuation or injection of the refrigerant into the circuit 15. In the present embodiment, the input unit 42 mainly includes operation switches provided in the outdoor unit 22.
The control means 40 detects that a predetermined input (in this embodiment, an operation by turning on the switch) has been made by the input section 42, and turns on the solenoid valves 23, 24, 25, 31, 32. Then, the pressure reducing valves 13 and 27 are forcibly opened (the state in which the refrigerant passes), and the compressor 11 and the pump 37 are forcibly stopped.

The reason for setting the solenoid valves 23, 24, 25, 31, 32, etc. in such a state will be described below.
Conventionally, a worker turns off the main power supply of an outdoor unit (that is, a state in which an electric device or an electric component such as a compressor, a pressure reducing valve, a four-way valve, a solenoid valve, or a pump provided in the outdoor unit cannot be energized). ), Vacuum and inject refrigerant into the circuit. In the present embodiment, if the main power source of the outdoor unit 22 is turned off, the compressor 11 and the pump 37 are stopped, the pressure reducing valves 13 and 27 are in a state immediately before the main power source is turned off, and the four-way valve 16 is turned off. The fluid discharged from the compressor 11 is directed to the solenoid valve 23, and the solenoid valves 23, 24, 25, 31, 32 are in the restricted state.

Therefore, the portion indicated by the thick line in FIG. 3 becomes a closed region where the fluid in the relevant region cannot flow out of the region due to the solenoid valves 23, 25 in the restricted state. Therefore, if the vacuum is drawn or the refrigerant is injected into the circuit in this state, the area cannot be vacuumed or filled with the refrigerant.

Therefore, in the present embodiment, the solenoid valves 23 and 25 are forcibly set to the non-restricted state while the main power source of the outdoor unit 22 is turned on so that the closed space is not formed in the circuit 15.
In addition to this, when the pressure reducing valves 13 and 27 are in the closed state (state in which the refrigerant does not pass), a closed region is formed in the circuit 15 in addition to the closed region indicated by the thick line in FIG. In the present embodiment, the pressure reducing valves 13 and 27 are forcedly opened so that a closed region is not formed in the circuit 15.

Then, the compressor 11 is forcibly stopped so that the fluid in the circuit 15 does not move due to the operation of the compressor 11, and then, in addition to the solenoid valves 23, 25, the solenoid valves 24, 31, 32 (electromagnetic valves All solenoid valves 23, 24, 25, 31, 32 including valves 23, 25 are forcibly set to a non-restricted state, and all pressure reducing valves 13, 27 are forcibly fully opened (a state in which a fluid passing therethrough is not depressurized) As an example of the open state), the fluid (refrigerant or air) in the circuit 15 is efficiently discharged from the service port 34 by evacuation, and the refrigerant injected from the service port 34 is efficiently supplied to the entire area of the circuit 15. So that it will be filled.

When it is not necessary to efficiently evacuate the vacuum or efficiently inject the refrigerant into the circuit 15, some of the solenoid valves 24, 31, 32 may be in the restricted state, and the pressure reducing valves 13, 27 may not discharge the fluid. It may be in a throttled state for depressurizing (an example of an open state). When some of the plurality of pressure reducing valves provided in the circuit contribute to the formation of the closed region in the closed state and some do not, they contribute to the formation of the closed region (a part of the pressure reducing valves). Only one may be forcibly opened.

When the refrigerant is injected into the circuit 15 and the pressure in the refrigerant container (containing the gaseous refrigerant) connected to the service port 34 is low and the refrigerant injection force from the service port 34 is weak, the compressor 11 is turned on. It may be activated to assist the filling of the refrigerant in the circuit 15. In this case, the compressor 11 is not stopped.
In the present embodiment, the four-way valve 16 is in a state in which the fluid discharged from the compressor 11 is directed to the solenoid valve 23 in the non-energized state, and the four-way valve 16 forms a closed region in the circuit 15 in the non-energized state. However, if the closed region is formed in the circuit depending on the state of the four-way valve, the four-way valve needs to be in a state where the closed region is not formed in the circuit.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and changes in conditions and the like without departing from the gist are all within the scope of application of the present invention.
For example, if no closed region is formed in the circuit even if all pressure reducing valves are closed, it is not necessary to forcefully open these pressure reducing valves, only the solenoid valve that forms a closed region in the restricted state. Should be in the non-restricted state. If no closed region is formed in the circuit even if all solenoid valves are in the restricted state, it is not necessary to put these solenoid valves in the unrestricted state, and only the pressure reducing valve that forms the closed region in the closed state is opened. Just put it in a state.

The input unit is not limited to the switch, and may be a touch screen or a microphone. When the input unit is a microphone, the predetermined input is utterance of a predetermined word made into the microphone.
The input unit and the control unit may be wirelessly connected.

10: Heat pump device, 11: Compressor, 12: Heat exchanger, 13: Pressure reducing valve, 14: Heat exchanger, 15: Circuit, 16: Four-way valve, 17: Circulation circuit, 18: Bypass path, 19: Branch path , 20: flow path, 21: indoor unit, 22: outdoor unit, 23, 24, 25: solenoid valve, 26: muffler, 27: pressure reducing valve, 28: check valve, 29: water heat exchanger, 30: reverse Stop valve, 31, 32: solenoid valve, 33: check valve, 34: service port, 35: hot water storage tank, 36: hot water boiling circuit, 37: pump, 38: water supply pipe, 39: hot water pipe, 40: control means, 41: remote controller, 42: input section, 43: fan

Claims (3)

In a heat pump device in which a service port is provided in a circuit connecting the compressor, the first heat exchanger, the pressure reducing valve, and the second heat exchanger,
A solenoid valve that is in a non-restricted state in which the flow of fluid in the circuit is restricted in a non-energized state, and is in a non-restricted state in which the flow of fluid in the circuit is not restricted in an energized state; The control unit includes a control unit that switches a restricted state and an input unit that is connected to the control unit, and the control unit detects that a predetermined input is made by the input unit and forcibly causes the electromagnetic valve to operate. A heat pump device, which is in an unrestricted state and / or forcibly opens the pressure reducing valve. The heat pump device according to claim 1, wherein the control unit detects the predetermined input at the input unit, forcibly sets all the electromagnetic valves to the non-restricted state, and forces all the pressure reducing valves. The heat pump device is characterized in that the heat pump device is in an open state. The heat pump device according to claim 1 or 2, wherein the control unit detects the predetermined input at the input unit and forcibly stops the compressor.

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