JP2018021735A - Heat pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump system capable of surely preventing uneven distribution of the amount of solution circulating in a compression cycle and an absorption cycle. SOLUTION: A compression cycle in which a refrigerant circulates and an absorption cycle in which a solution circulates are provided, and the refrigerant evaporated in the evaporator 14 of the compression cycle is absorbed by the solution in the absorber 20 to circulate in the absorption cycle, and the absorption cycle. After exchanging heat with the exhaust heat in the regenerator 24, the refrigerant separated from the solution is supplied to the compression cycle, and the refrigerant gas-liquid separator 11 arranged on the discharge side of the compressor 10 in the compression cycle, The second solution return pipe 36 for returning the solution accumulated in the refrigerant gas-liquid separator 11 to the absorption cycle is provided. [Selection diagram] Figure 1

Description

  The present invention relates to a heat pump system, and more particularly, to a compression absorption heat pump system including a compression cycle and an absorption cycle.

Conventionally, a compression absorption heat pump that uses both a compression cycle that uses the shaft output of a prime mover as a power source for a compressor that compresses refrigerant, and an absorption cycle that uses the exhaust heat of the prime mover as a heat source for a regenerator that heats the solution A system is known (see, for example, Patent Document 1).
In this compression absorption heat pump system, the refrigerant that has passed through the use side heat exchanger of the compression cycle is absorbed by the solution in the absorption cycle absorber and circulated, and after regeneration by the regenerator, the refrigerant is separated, and this refrigerant is compressed into the compression cycle. Is supplied to the suction side of the compressor, and cold heat or warm heat is supplied to the heat load through the use side heat exchanger.

JP 2010-096429 A

However, in the compression absorption heat pump system of Patent Document 1, when the compression cycle and the absorption cycle are operated in combination, the amount of the solution circulating in the compression cycle and the amount of the solution circulating in the absorption cycle are There is a risk of bias.
When a predetermined amount or more of the solution is stored in the compressor of the compression cycle, there is a problem that the solution is discharged together with the refrigerant from the compressor, and the air conditioning performance of the compression cycle is deteriorated. Moreover, since the amount of the solution in the absorption cycle is insufficient, there is a problem that the performance of the absorption cycle is reduced.
On the other hand, when the solution of the compressor in the compression cycle becomes a predetermined amount or less, since the solution has a function as a lubricant for the compressor, there is a problem that the compressor may be damaged due to wear.

  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 system that can reliably prevent a deviation in the amount of solution circulating in the compression cycle and the absorption cycle. It is.

  In order to achieve the above object, the present invention comprises a compression cycle in which a refrigerant circulates and an absorption cycle in which a solution circulates, and the refrigerant evaporated in the evaporator of the compression cycle is absorbed in the solution by the absorber, and the absorption cycle. A heat pump system that circulates the inside and exchanges heat with exhaust heat in the regenerator in the absorption cycle, and then supplies the refrigerant separated from the solution to the compression cycle, and is disposed on the discharge side of the compressor in the compression cycle And a solution return pipe for returning the solution accumulated in the refrigerant gas-liquid separator to the absorption cycle.

  According to this, the solution return pipe can return the solution accumulated in the refrigerant gas-liquid separator to the absorption cycle, thereby reliably preventing the deviation of the amount of the solution circulating in the compression cycle and the absorption cycle, respectively. can do.

  According to the present invention, since it is possible to reliably prevent a deviation in the amount of solution circulating in the compression cycle and the absorption cycle, a predetermined amount or more of the solution circulates in the compression cycle, thereby improving the air conditioning performance of the compression cycle. While being able to prevent that it falls, the quantity of the solution which circulates through an absorption cycle can be ensured, and the performance of an absorption cycle can be improved.

The block diagram which shows the normal operation | movement of the heat pump system which concerns on this embodiment The block diagram which shows the isolation | separation operation | movement of the heat pump system which concerns on this embodiment The block diagram which shows the control structure of this embodiment Flow chart showing the operation of this embodiment

The first invention comprises a compression cycle in which the refrigerant circulates and an absorption cycle in which the solution circulates, the refrigerant evaporated in the evaporator of the compression cycle is absorbed in the solution by the absorber and circulated in the absorption cycle, A heat pump system for supplying a refrigerant separated from the solution to the compression cycle after exchanging heat with exhaust heat in the absorption cycle in the absorption cycle, wherein the refrigerant gas is disposed on the discharge side of the compressor of the compression cycle. A heat pump system comprising: a liquid separator; and a solution return pipe for returning the solution accumulated in the refrigerant gas-liquid separator to the absorption cycle.
As a result, the solution return pipe can return the solution accumulated in the refrigerant gas-liquid separator to the absorption cycle, so that it is possible to reliably prevent a deviation in the amount of the solution circulating in the compression cycle and the absorption cycle. Can do. As a result, it is possible to prevent a predetermined amount or more of the solution from circulating in the compression cycle and reduce the air conditioning performance of the compression cycle, and to secure the amount of the solution that circulates in the absorption cycle, The performance of the absorption cycle can be improved.

According to a second aspect of the present invention, there is provided a solution gas-liquid separator disposed downstream of the regenerator of the absorption cycle, and a solution return for returning the solution accumulated in the solution gas-liquid separator to the suction side of the compressor It is the heat pump system characterized by having a piping for operation.
As a result, the solution return pipe can return the solution accumulated in the gas-liquid separator for solution to the compression cycle, so that it is possible to reliably prevent a deviation in the amount of the solution that circulates in the compression cycle and the absorption cycle. Can do. As a result, the amount of the compressor solution in the compression cycle can be made appropriate, the compressor can be prevented from being worn, and the compressor can be prevented from being broken.

A third aspect of the present invention is a heat pump system, wherein a valve is provided in the solution return pipe, and the return of the solution is controlled by opening and closing the valve.
Thereby, the return of the solution can be controlled through the solution return pipe by controlling the opening and closing of the valve.

A fourth invention is a heat pump system, wherein the valve is an electronic expansion valve capable of controlling an opening degree.
Thereby, the return of the solution can be controlled through the solution return pipe by controlling the opening and closing of the electronic expansion valve.

5th invention provides the liquid level sensor which detects the liquid level of the solution in the said compressor, the said gas-liquid separator for refrigerant | coolants, and the said gas-liquid separator for solutions, Based on the detected value by each said liquid level sensor A heat pump system comprising: a control device that determines the amount of solution in the compressor, the gas-liquid separator for refrigerant, and the gas-liquid separator for solution, and controls opening and closing of the electronic expansion valve. It is.
Thus, the control device determines the amount of the solution in the compressor, the gas-liquid separator for the refrigerant, and the gas-liquid separator for the solution based on the detection value by the liquid level sensor, and performs opening / closing control of the electronic expansion valve. Thus, the return control of the solution to the compression cycle or the absorption cycle can be performed according to the amount of the solution in the compressor, the gas-liquid separator for refrigerant, or the gas-liquid separator for solution.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a configuration diagram showing a normal operation of the heat pump system according to the embodiment of the present invention. FIG. 2 is a configuration diagram illustrating a separation operation of the heat pump system according to the present embodiment.
As shown in FIG. 1, the heat pump system 1 absorbs a refrigerant gas in a low-temperature and low-pressure solution and exchanges heat, and then absorbs the refrigerant and the refrigerant that has been compressed to a high temperature and high pressure after separating the solution and the refrigerant gas. And a compression cycle that utilizes heat dissipation during condensation.
In heat pump system 1 concerning this embodiment, it is assumed that carbon dioxide is used as a refrigerant.

First, the compression cycle will be described.
As shown in FIG. 1, the compression cycle is configured by connecting a compressor 10, a refrigerant gas-liquid separator 11, a gas cooler 12, an indoor expansion valve 13, and an evaporator 14 through a refrigerant pipe 15. ing. The broken-line arrows in FIGS. 1 and 2 indicate the flow of the refrigerant.
In addition, a refrigerant gas-liquid separator 11 is disposed on the discharge side of the compressor 10, and the refrigerant gas (that is, gaseous carbon dioxide) separated in the refrigerant gas-liquid separator 11 has an appropriate pressure level. For example, the pressure is increased to an arbitrary pressure value equal to or higher than the critical pressure and sent to the gas cooler 12.

The gas cooler 12 includes a gas cooler fan 16. The gas cooler 12 drives the gas cooler fan 16 to exchange heat between the outside air and the refrigerant, cools the refrigerant, lowers enthalpy, and is used as a high-pressure refrigerant indoors. It is configured to be sent to the expansion valve 13.
The indoor expansion valve 13 and the evaporator 14 are accommodated in, for example, an indoor unit 17 such as an air conditioner. The refrigerant sent from the gas cooler 12 is expanded by depressurizing the refrigerant by the indoor expansion valve 13 and is then sent to the evaporator 14. In the evaporator 14, it is evaporated by exchanging heat with room air. Thereby, indoor air is cooled and indoor cooling is performed.
The evaporator 14 is connected to the suction side of the compressor 10 via the refrigerant pipe 15. A first electronic expansion valve 40 is provided in the middle of the refrigerant pipe 15.

Next, the absorption cycle will be described.
The absorption cycle includes an absorber 20, a solution tank 21, a solution pump 22, a solution heat exchanger 23, a regenerator 24, a solution gas-liquid separator 25, and a power recovery pump 26, and a solution pipe 27. It is configured to be connected by.

The evaporator 14 is connected to the absorber 20 via a second electronic expansion valve 41, and the absorber 20 absorbs the refrigerant gas of carbon dioxide supplied from the evaporator 14 into the solution.
The absorber 20 is provided with an absorber fan 28 for removing heat absorbed during the absorption process.
A solution pump 22 is connected to the absorber 20 via a solution tank 21, and by driving the solution pump 22, the solution is sent to the regenerator 24 via the solution heat exchanger 23.

  For example, an exhaust heat pipe 30 through which exhaust heat such as hot water and hot air circulates is connected to the regenerator 24, and the solution sent to the regenerator 24 is heated by the exhaust heat circulating through the exhaust heat pipe 30. Then, it is concentrated and sent to the gas-liquid separator 25 for solution. The solution gas-liquid separator 25 stores the solution sent from the regenerator 24 and separates the refrigerant gas from the solution inside the solution gas-liquid separator 25.

A refrigerant return pipe 31 is connected to the upper part of the solution gas-liquid separator 25, and the refrigerant return pipe 31 is connected to the radiator 32 via a third electronic expansion valve 42.
The radiator 32 includes a radiator fan 33, and the radiator 32 drives the radiator fan 33 to exchange heat between the outside air and the refrigerant, thereby cooling the refrigerant to a low temperature. The refrigerant is returned to the compressor 10.

The lower part of the solution gas-liquid separator 25 is connected to the solution heat exchanger 23 via a solution pipe 27.
The solution heat exchanger 23 performs heat exchange between the solution sent from the absorber 20 and the solution sent from the solution gas-liquid separator 25, and the amount of heat given to the solution by heating in the regenerator 24. Is to be collected. Thereby, the efficiency of an absorption cycle can be improved.
The solution after heat exchange in the solution heat exchanger 23 is sent to the absorber 20 via the power recovery pump 26.

A second refrigerant return pipe 34 is connected to the upper part of the solution tank 21, and the second refrigerant return pipe 34 is connected to the suction side of the compressor 10 via the fourth electronic expansion valve 43 on the way. ing.
A solution return pipe 35 is connected to the lower part of the solution gas-liquid separator 25, and the solution return pipe 35 is connected to the suction side of the compressor 10 via the fifth electronic expansion valve 44 on the way. It is connected.
A second solution return pipe 36 is connected to the lower part of the refrigerant gas-liquid separator 11, and the second solution return pipe 36 passes through the sixth electronic expansion valve 45 on the way. It is connected to a solution pipe 27 between the vessel 25 and the solution heat exchanger 23.

  The first electronic expansion valve 40, the second electronic expansion valve 41, the third electronic expansion valve 42, the fourth electronic expansion valve 43, the fifth electronic expansion valve 44, and the sixth electronic expansion valve 45 are 0 pulses that are fully closed. It is a valve that can control the opening between 480 pulses that are fully open. Note that, in the present embodiment, the fourth electronic expansion valve 43 uses a valve capable of controlling the opening, but may be configured by a check valve that does not control the opening, for example.

In addition, liquid level sensors 50a, 50b, and 50c for detecting internal liquid level positions are attached to the compressor 10, the refrigerant gas-liquid separator 11, and the solution gas-liquid separator 25, respectively.
The solution pipe 27 on the outlet side of the regenerator 24 is provided with a temperature sensor 51 for detecting the temperature on the outlet side of the solution.
A refrigerant pressure sensor 52 that detects the pressure of the refrigerant is provided on the suction side of the compressor 10, and a solution pressure sensor 53 that detects the pressure of the solution is provided on the outlet side of the solution tank 21.

Next, the control configuration of this embodiment will be described.
FIG. 3 is a block diagram showing a control configuration of the present embodiment.
As shown in FIG. 3, the heat pump system of this embodiment includes a control device 55.
The control device 55 centrally controls each part of the heat pump system, and includes a CPU as a calculation execution unit, a basic control program that can be executed by the CPU, a ROM that stores predetermined data, and the like in a nonvolatile manner. Memory and other peripheral circuits.

The control device 55 is configured to input detection values of the temperature sensor 51, the refrigerant pressure sensor 52, the solution pressure sensor 53, and the liquid level sensors 50a, 50b, and 50c.
The control device 55 includes the compressor 10, the gas cooler fan 16, the absorber fan 28, the radiator based on the detection values of the temperature sensor 51, the refrigerant pressure sensor 52, the solution pressure sensor 53, and the liquid level sensors 50a, 50b, and 50c. The fan 33 and the electronic expansion valves 40, 41, 42, 43, 44, and 45 are configured to be controlled.

Specifically, at the time of startup, the control device 55 “opens” the first electronic expansion valve 40 and the fourth electronic expansion valve 43, the second electronic expansion valve 41, the third electronic expansion valve 42, and the fifth electronic expansion valve. The expansion valve 44 and the sixth electronic expansion valve 45 are controlled to be “closed”.
In this case, the fourth electronic expansion valve 43 is not controlled to be fully opened, but is controlled to be opened to, for example, about 100 to 250 pulses when fully opened with 480 pulses.
Note that when the fourth electronic expansion valve 43 is a check valve, the opening degree control is unnecessary.

In this state, the control device 55 controls the compressor 10 to be activated and the solution pump 22 and the power recovery pump 26 to be activated.
By controlling in this way, the refrigerant discharged from the compressor 10 has a compression cycle that circulates through the refrigerant gas-liquid separator 11, the gas cooler 12, the indoor expansion valve 13, and the evaporator 14 via the refrigerant pipe 15. It is formed. On the other hand, the solution sent by the solution pump 22 is supplied via the solution pipe 27 to the absorber 20, the solution tank 21, the solution pump 22, the solution heat exchanger 23, the regenerator 24, the solution gas-liquid separator 25, and the solution heat. An absorption cycle in which the exchanger 23 and the power recovery pump 26 are sequentially circulated is formed.
At this time, since the fourth electronic expansion valve 43 is “open”, the refrigerant gas accumulated in the upper part of the solution tank 21 flows to the suction side of the compressor 10.

  In addition, when the control device 55 detects the solution temperature on the outlet side of the regenerator 24 by the temperature sensor 51 and determines that the detected temperature has reached a predetermined temperature, the control device 55 performs the first electronic expansion valve 40 and the fourth electronic device. The electronic expansion valve 43 is controlled to be “closed” and the second electronic expansion valve 41 and the third electronic expansion valve 42 are operated to be “open”. Thereby, it switches to the compression absorption hybrid cycle which uses a compression cycle and an absorption cycle together.

In the present embodiment, the control device 55 inputs detection values from the liquid level sensors 50a, 50b, and 50c, and the detection values from the liquid level sensors 50a, 50b, and 50c are within a predetermined range. When the amount of the solution is “normal” and the detection value is lower than the predetermined range, it is determined that the amount of the solution is “low”, and when the detection value is higher than the predetermined range, the amount of the solution is “high”.
When the control device determines that the amount of the solution is “ordinary” based on the detection values of the liquid level sensors 50a, 50b, and 50c, the control device sets the fifth electronic expansion valve 44 and the sixth electronic expansion valve 45 to the same. Control to close. In this state, the solution flow is stopped between the compression cycle and the absorption cycle.

The amount of the solution is “low” based on the detected values by the liquid level sensor 50 a of the compressor 10 and the liquid level sensor 50 b of the refrigerant gas-liquid separator 11, and the control device uses the liquid in the solution gas-liquid separator 25. When it is determined that the amount of the solution is “large” based on the detection value by the surface sensor 50c, the solution in the absorption cycle is surplus and the solution in the compression cycle is insufficient.
Therefore, in this case, the control device controls the fifth electronic expansion valve 44 to “open” and the sixth electronic expansion valve 45 to “close”. At this time, the fifth electronic expansion valve 44 is not controlled to be fully opened, but is controlled to be opened to, for example, about 100 to 250 pulses when fully opened with 480 pulses.
As a result, the solution accumulated in the solution gas-liquid separator 25 can be sent to the suction side of the compressor 10 via the solution return pipe 35.

In the control device, the amount of the solution is “ordinary” based on the detection value by the liquid level sensor 50a of the compressor 10, and the amount of the solution is based on the detection value by the liquid level sensor 50b of the refrigerant gas-liquid separator 11. If it is “large” and the amount of the solution is determined to be “small” based on the detection value by the liquid level sensor 50c of the gas-liquid separator for solution 25, the solution in the compression cycle is left, and the absorption The solution in the cycle is in shortage.
Therefore, in this case, the control device controls the fifth electronic expansion valve 44 to “close” and the sixth electronic expansion valve 45 to “open”. At this time, the sixth electronic expansion valve 45 is not controlled to be fully opened, but is controlled to be opened to, for example, about 100 to 250 pulses when fully opened with 480 pulses.
Thereby, the solution accumulated in the refrigerant gas-liquid separator 11 can be sent to the outlet side of the solution gas-liquid separator 25 via the second solution return pipe 36.

Next, control according to the present embodiment will be described with reference to a flowchart shown in FIG.
First, when the heat pump system is activated (ST1), the control device 55 “opens” the first electronic expansion valve 40 and the fourth electronic expansion valve 43, the second electronic expansion valve 41, the third electronic expansion valve 42, and the fifth electronic expansion valve 43. The electronic expansion valve 44 and the sixth electronic expansion valve 45 are controlled to be “closed” to separate the compression cycle and the absorption cycle (ST2).
In this state, the controller 55 controls the compressor 10 to be activated and the solution pump 22 and the power recovery pump 26 to be activated (ST3).

By controlling in this way, the refrigerant discharged from the compressor 10 has a compression cycle that circulates through the refrigerant gas-liquid separator 11, the gas cooler 12, the indoor expansion valve 13, and the evaporator 14 via the refrigerant pipe 15. It is formed. On the other hand, the solution sent by the solution pump 22 is supplied via the solution pipe 27 to the absorber 20, the solution tank 21, the solution pump 22, the solution heat exchanger 23, the regenerator 24, the solution gas-liquid separator 25, and the solution heat. An absorption cycle in which the exchanger 23 and the power recovery pump 26 are sequentially circulated is formed.
Thus, at the time of start-up, the compression cycle and the absorption cycle are driven independently.

Next, the control device 55 detects the solution temperature on the outlet side of the regenerator 24 by the temperature sensor 51, and determines whether or not the detected temperature has reached a predetermined temperature (ST5). If the detected temperature does not reach the predetermined temperature (ST5: NO), control is performed so that the compression cycle and the absorption cycle are driven independently as they are.
Then, when the solution temperature on the outlet side of the regenerator 24 reaches a predetermined temperature (ST5: YES), the control device 55 “closes” the first electronic expansion valve 40 and the fourth electronic expansion valve 43, and performs the second electronic expansion. The valve 41 and the third electronic expansion valve 42 are operated to “open”, the compression cycle and the absorption cycle are used together (ST6), and operation control in the compression / absorption hybrid cycle is performed (ST7).

By controlling in this way, the refrigerant discharged from the compressor 10 circulates through the refrigerant gas-liquid separator 11, the gas cooler 12, the indoor expansion valve 13, and the evaporator 14 via the refrigerant pipe 15, It flows into the absorber 20 through the two-electron expansion valve 41.
The refrigerant flowing into the absorber 20 is absorbed by the solution in the absorber 20 and sent to the solution tank 21. The solution is sent to the regenerator 24 through the solution heat exchanger 23, heated and concentrated by exchanging heat with the exhaust heat. In the regenerator 24, the concentrated solution is sent to the solution gas-liquid separator 25, where the solution and the refrigerant are separated.
The separated refrigerant is sent to the radiator 32 through the third electronic expansion valve 42, exchanges heat in the radiator 32, and then sucked into the compressor 10.
On the other hand, the solution after the refrigerant is separated by the solution gas-liquid separator 25 exchanges heat with the solution sent from the absorber 20 via the solution heat exchanger 23 and then the absorber via the power recovery pump 26. 20 is sent.
By operating the heat pump system in the compression absorption hybrid cycle as described above, it is possible to perform efficient cooling operation by circulating the refrigerant using the solution.

  And a control apparatus judges the quantity of a solution based on the detection value by each liquid level sensor 50a, 50b, 50c, the liquid level sensor 50a of the compressor 10, the liquid level sensor 50b of the gas-liquid separator 11 for refrigerant | coolants, When it is determined that the liquid level is “normal” based on the detection value by the liquid level sensor 50c of the gas-liquid separator for solution 25 (ST8 to ST10), the control device The expansion valve 44 and the sixth electronic expansion valve 45 are controlled to be closed (ST11). In this state, the solution flow is stopped between the compression cycle and the absorption cycle.

  Further, the control device controls the liquid level of the gas-liquid separator 25 for the solution to be “low” based on the detected values by the liquid level sensor 50 a of the compressor 10 and the liquid level sensor 50 b of the refrigerant gas-liquid separator 11. When it is determined that the liquid level is “many” based on the detection value by the surface sensor 50c (ST8 to ST10), the control device “opens” the fifth electronic expansion valve 44, and the sixth electronic expansion valve. 45 is controlled to be “closed” (ST12). As a result, the solution accumulated in the solution gas-liquid separator 25 is sent to the suction side of the compressor 10 via the solution return pipe 35.

Further, the control device determines that the liquid level is “normal” based on the detection value by the liquid level sensor 50 a of the compressor 10, and the liquid level is based on the detection value by the liquid level sensor 50 b of the refrigerant gas-liquid separator 11. If it is determined that the liquid level is “low” based on the value detected by the liquid level sensor 50c of the gas-liquid separator 25 for solution (ST8 to ST10), the control device The expansion valve 44 is controlled to be “closed” and the sixth electronic expansion valve 45 is controlled to be “open” (ST13). As a result, the solution accumulated in the refrigerant gas-liquid separator 11 is sent to the outlet side of the solution gas-liquid separator 25 via the second solution return pipe 36.
By controlling in this way, it can adjust so that the quantity of the solution in a compression cycle and an absorption cycle may become appropriate.

As described above, in the present embodiment, the refrigerant gas-liquid separator 11 disposed on the discharge side of the compressor 10 in the compression cycle and the solution accumulated in the refrigerant gas-liquid separator 11 are used as the absorption cycle. A second solution return pipe 36 (solution return pipe) for returning is provided.
According to this, since the solution accumulated in the refrigerant gas-liquid separator 11 can be returned to the absorption cycle by the second solution return pipe 36, the amount of the solution circulating in the compression cycle and the absorption cycle is uneven. Can be reliably prevented. As a result, it is possible to prevent a predetermined amount or more of the solution from circulating in the compression cycle and reduce the air conditioning performance of the compression cycle, and to secure the amount of the solution that circulates in the absorption cycle, The performance of the absorption cycle can be improved.

Further, in the present embodiment, the solution gas-liquid separator 25 disposed on the downstream side of the regenerator of the absorption cycle, and the solution for returning the solution accumulated in the solution gas-liquid separator 25 to the suction side of the compressor 10 And a return pipe 35.
According to this, since the solution collected in the gas-liquid separator for solution 25 can be returned to the compression cycle by the solution return pipe 35, the deviation of the amount of the solution circulating in the compression cycle and the absorption cycle can be ensured. Can be prevented. As a result, the amount of the solution in the compressor 10 in the compression cycle can be made appropriate, wear of the compressor 10 can be prevented, and failure of the compressor 10 can be prevented.

In the present embodiment, the fifth electronic expansion valve 44 and the sixth electronic expansion valve 44 and the sixth electronic expansion valve 45 (valves) are provided in the solution return pipe 35 and the second solution return pipe 36. The return of the solution is controlled by opening and closing the electronic expansion valve 45.
According to this, the return of the solution can be controlled via the solution return pipe 35 or the second solution return pipe 36 by controlling the opening / closing of the fifth electronic expansion valve 44 or the sixth electronic expansion valve 45. .

In the present embodiment, the fifth electronic expansion valve 44 (valve) or the sixth electronic expansion valve 45 (valve) is an expansion valve capable of controlling the opening degree.
According to this, the return of the solution can be controlled via the solution return pipe 35 or the second solution return pipe 36 by controlling the opening / closing of the fifth electronic expansion valve 44 or the sixth electronic expansion valve 45. .

In the present embodiment, the liquid level sensors 50a, 50b, and 50c that detect the liquid level of the solution in the compressor 10, the gas-liquid separator 11 for the refrigerant, and the gas-liquid separator 25 for the solution are provided. Based on the detection values of 50a, 50b, and 50c, the amount of solution in the compressor 10, the gas-liquid separator 11 for refrigerant, and the gas-liquid separator 25 for solution is determined, and the fifth electronic expansion valve 44 or the sixth electronic expansion is determined. A control device that performs opening and closing control of the valve 45 is provided.
According to this, the control device determines the amount of the solution in the compressor 10, the refrigerant gas-liquid separator 11, and the solution gas-liquid separator 25 based on the detection values by the liquid level sensors 50a, 50b, and 50c. By controlling the opening or closing of the fifth electronic expansion valve 44 or the sixth electronic expansion valve 45, compression is performed according to the amount of the solution in the compressor 10, the gas-liquid separator 11 for refrigerant, or the gas-liquid separator 25 for solution. Control of solution return to the cycle or absorption cycle can be performed.

In addition, this embodiment shows the one aspect | mode which applied this invention, Comprising: This invention is not limited to the said embodiment.
For example, in the present embodiment, the gas cooler 12 of the compression cycle is an air cooling system using the gas cooler fan 16, but may be a water cooling system. Moreover, although the heat radiator 32 of the compression cycle is an air cooling method using the heat radiator fan 33, a water cooling method may be used, or a throttle valve may be used instead of the heat radiator 32.
A throttle valve may be used instead of the power recovery pump 26 in the absorption cycle. Further, the solution heat exchanger 23 and the solution tank 21 in the absorption cycle may be omitted.

  As described above, the heat pump system according to the present invention can be suitably used as a heat pump capable of performing an efficient operation as a heat pump system using both a compression cycle and an absorption cycle.

DESCRIPTION OF SYMBOLS 1 Heat pump system 10 Compressor 11 Refrigerant gas-liquid separator 12 Gas cooler 13 Indoor expansion valve 14 Evaporator 15 Refrigerant piping 17 Indoor unit 20 Absorber 22 Solution pump 23 Solution heat exchanger 24 Regenerator 25 Gas-liquid separator for solution 27 Solution pipe 30 Waste heat pipe 31 Refrigerant return pipe 32 Radiator 34 Second refrigerant return pipe 35 Solution return pipe 36 Second solution return pipe 40 First electronic expansion valve 41 Second electronic expansion valve 42 Third electronic expansion Valve 43 Fourth electronic expansion valve 44 Fifth electronic expansion valve 45 Sixth electronic expansion valve 50a, 50b, 50c Liquid level sensor 51 Temperature sensor 52 Refrigerant pressure sensor 53 Solution pressure sensor 55 Control device

Claims (5)

A compression cycle in which the refrigerant circulates and an absorption cycle in which the solution circulates, the refrigerant evaporated in the evaporator of the compression cycle is absorbed in the solution by the absorber and circulated in the absorption cycle, and the regenerator in the absorption cycle A heat pump system for supplying the refrigerant separated from the solution to the compression cycle after exchanging heat with exhaust heat.
A refrigerant gas-liquid separator disposed on the discharge side of the compressor of the compression cycle, and a solution return pipe for returning the solution accumulated in the refrigerant gas-liquid separator to the absorption cycle. And heat pump system.   A solution gas-liquid separator disposed downstream of the regenerator of the absorption cycle; and a solution return pipe for returning the solution accumulated in the solution gas-liquid separator to the suction side of the compressor. The heat pump system according to claim 1, wherein:   The heat pump system according to claim 1 or 2, wherein a valve is provided in the solution return pipe, and the return of the solution is controlled by opening and closing the valve.   The heat pump system according to claim 3, wherein the valve is an electronic expansion valve capable of controlling an opening degree. A liquid level sensor for detecting the liquid level of the solution in the compressor, the gas-liquid separator for refrigerant, and the gas-liquid separator for solution;
A control device that determines the amount of solution in the compressor, the gas-liquid separator for refrigerant, and the gas-liquid separator for solution based on the detection value by each liquid level sensor, and performs opening / closing control of the electronic expansion valve The heat pump system according to claim 4, comprising:

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