JP2016166706A - Heat pump cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump cycle device suppressing excessive increase of discharge refrigerant temperature.SOLUTION: A heat pump cycle device 100 includes: a refrigerant circuit sequentially connecting a compressor 1, a water refrigerant heat exchanger 3, a first expansion valve 4 and a heat source side heat exchanger 5 with a refrigerant pipeline; an injection pipeline 14 connecting a refrigerant pipeline between the water refrigerant heat exchanger 3 and the first expansion valve 4 to the intermediate pressure part of the compressor 1; a second expansion valve 22; an injection circuit 21 into which a refrigerant cooling part 8 is incorporated; and an air blower 7 configured to pass air to the heat source side heat exchanger 5. The refrigerant cooling part 8 is arranged so that air having passed through the heat source side heat exchanger 5 passes the refrigerant cooling part 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat pump cycle device, and more particularly to a heat pump cycle device capable of injecting liquid refrigerant into an intermediate pressure portion of a compressor.

  Conventionally, as a heat pump cycle apparatus, an air conditioner is a typical apparatus, and in order to suppress an increase in the refrigerant discharge refrigerant temperature, liquid refrigerant is injected into an intermediate pressure portion of the compressor (hereinafter referred to as liquid injection). A device provided with an injection circuit to be described is proposed (for example, Patent Document 1).

  A heat pump type heating apparatus, which is a kind of heat pump cycle apparatus disclosed in Patent Document 1, includes a refrigerant circuit in which a compressor, a condenser, an expansion valve, and an evaporator are sequentially connected by refrigerant piping. The refrigerant circuit includes a refrigerant pipe connecting the condenser and the evaporator, an injection pipe connecting the intermediate pressure portion of the compressor, and an injection circuit including an injection expansion valve. A part of the injection pipe is arranged in the evaporator, and the refrigerant flowing through the injection circuit is cooled by exchanging heat with the outside air in the evaporator.

  On the other hand, it is one of the heat pump cycle devices, and is a water-refrigerant heat exchanger in which a condenser performs heat exchange between water and refrigerant, such as a heat pump hot / cold water air conditioner and a heat pump hot water supply device. There is a heat pump cycle device that generates hot water by heat exchange. Also in such a heat pump cycle apparatus, what provided the injection circuit mentioned above in order to perform liquid injection to a compressor is proposed.

  In the heat pump cycle apparatus as described above, the discharge refrigerant temperature of the compressor increases in order to increase the rotation speed of the compressor as the temperature (outward temperature) of the water flowing out of the water-refrigerant heat exchanger increases. . When the discharge refrigerant temperature exceeds the upper limit value of the discharge refrigerant temperature of the compressor (the upper limit value that the compressor manufacturer can guarantee performance), the discharge refrigerant temperature protection control is activated and the compressor stops. . After the compressor stops, when the discharge refrigerant temperature falls below a predetermined temperature (for example, a temperature that is 5 ° C. lower than the upper limit value of the discharge refrigerant temperature), the discharge refrigerant temperature protection control is canceled and the compressor is restarted. If the rotation speed of the compressor rises to a high rotation speed, the stop / restart of the compressor is frequently repeated by executing / releasing the discharge refrigerant temperature protection control, so that the stable heat pump cycle device can be operated. There is no fear.

  A heat pump cycle apparatus equipped with an injection circuit opens an injection expansion valve, causes a part of the liquid refrigerant condensed by the water refrigerant heat exchanger to flow into the injection pipe, and causes the refrigerant cooled by the evaporator to enter the intermediate pressure part of the compressor. By injecting, the inside of the compressor can be cooled. Thereby, since the discharge refrigerant temperature rise of a compressor can be suppressed, it can prevent that a compressor stops and restarts frequently by execution / release of discharge refrigerant temperature protection control, and can perform the operation | movement of a heat pump cycle apparatus stably.

JP 2013-204851 A

  In a heat pump type heating device, for example, when the hot water stored in a hot water storage tank is heated to a high temperature (for example, 90 ° C.), the heating capacity required by a heating unit such as a radiator installed in a house with low heat insulation is exhibited. In order to do this, when flowing hot water to the heating unit, the temperature of water flowing out from the water-refrigerant heat exchanger (outward temperature) may be increased. In these cases, the compressor is driven at a very high rotational speed (for example, 120 rps), and the discharge refrigerant temperature increases accordingly. As described in Patent Document 1, in a heat pump cycle apparatus including an injection circuit in which a part of an injection pipe is disposed in an evaporator, the refrigerant flowing in the injection circuit is cooled by exchanging heat with the outside air. However, when the above-described high-temperature hot water supply is necessary, the discharge refrigerant temperature cannot be lowered sufficiently, and the discharge refrigerant temperature may exceed the upper limit value of the discharge refrigerant temperature of the compressor, and the discharge refrigerant temperature protection control may be activated. there were.

  Then, an object of this invention is to provide the heat pump cycle apparatus which suppresses the excessive raise of discharge refrigerant temperature.

  This invention solves the above-mentioned subject, Comprising: The heat pump cycle apparatus of this invention is a refrigerant | coolant piping in order with a compressor, a utilization side heat exchanger, a 1st expansion valve, and a heat source side heat exchanger. A refrigerant circuit connected, one end connected to a refrigerant pipe between the use side heat exchanger and the first expansion valve in the refrigerant circuit, and the other end connected to an intermediate pressure part of the compressor; and an injection pipe Arranged in the vicinity of the heat source side heat exchanger, a second expansion valve that adjusts the amount of refrigerant that flows through the injection pipe that is incorporated, a refrigerant cooling unit that cools the refrigerant that is incorporated into the injection pipe and flows through the injection pipe, and the heat source side heat exchanger It is a heat pump cycle apparatus provided with the blower which was made, Comprising: The air which passed the heat-source side heat exchanger by rotation of a fan passes a refrigerant | coolant cooling part Sea urchin, the refrigerant cooling unit is disposed.

  The refrigerant cooling unit is fixed to the leeward side of the heat source side heat exchanger.

  The heat pump cycle device of the present invention can suppress an excessive increase in the discharge refrigerant temperature.

It is a lineblock diagram of a heat pump cycle device in an embodiment of the present invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As an embodiment, a heat pump cycle device having a load terminal such as a heating unit such as a floor heating device or a radiator or a hot water storage tank, and performing heat exchange between water and refrigerant in a water refrigerant heat exchanger that is a use side heat exchanger Will be described as an example. The present invention is not limited to the following embodiments, and can be variously modified without departing from the gist of the present invention.

  FIG. 1 shows a configuration of a heat pump cycle apparatus according to the present invention. The heat pump cycle device 100 includes a compressor 1, a four-way valve 2, a water-refrigerant heat exchanger 3 that performs heat exchange between the refrigerant and water, a first expansion valve 4, a heat source side heat exchanger 5, and an accumulator 6 in this order. 11, the refrigerant circuit 10 is configured, and the four-way valve 2 is configured to switch the refrigerant circulation direction in the refrigerant circuit 10. The compressor 1, the four-way valve 2, the first expansion valve 4, the heat source side heat exchanger 5, and the accumulator 6 are provided in the outdoor unit 9.

  The refrigerant circuit 10 has one end connected to the refrigerant pipe 11 between the water refrigerant heat exchanger 3 and the first expansion valve 4 in the refrigerant circuit and the other end connected to the intermediate pressure part 1a of the compressor 1. The second expansion valve 22 that adjusts the amount of refrigerant that flows into the injection pipe 14 and that flows through the injection pipe 14, and the refrigerant cooling unit 8 that cools the refrigerant that flows into the injection pipe 14 and flows through the injection pipe 14. 21 is provided. The refrigerant cooling unit 8 is formed by bending the injection pipe 14 a plurality of times.

  Although illustration is omitted, the casing of the outdoor unit 9 includes a suction port for taking outside air into the casing of the outdoor unit 9 and the outside air that has exchanged heat with the refrigerant in the heat source side heat exchanger 5. The blower outlet for discharging | emitting to the exterior is provided, and the space inside the housing | casing which connects a suction inlet and a blower outlet is the ventilation path of external air. In this ventilation path, the heat source side heat exchanger 5, the blower 7, and a bell mouth (not shown) are arranged in the direction from the inlet to the outlet, that is, in the direction from the windward side to the leeward side in the flow of outside air in the ventilation path. The refrigerant cooling unit 8 is arranged in order. The refrigerant cooling unit 8 is fixed to the bell mouth described above or a fan guard (not shown) attached to the air outlet.

  When the hot pump hot water supply is required in the heat pump cycle apparatus 100, or when the outside air temperature during the heating operation or the hot water supply operation is low, the required operation capacity is high and the rotation speed of the compressor 1 is increased accordingly. When the opening of the second expansion valve 22 is set to an opening corresponding to the rotational speed of the compressor 1, liquid injection is performed on the compressor 1. In cases other than the above, that is, when the required hot water supply temperature is low, or when the required operating capacity is low and the rotation speed of the compressor 1 is low, such as when the outside air temperature during heating operation or hot water supply operation is high, 2 The expansion valve 22 is fully closed, and no liquid injection is performed on the compressor 1.

  A discharge refrigerant temperature sensor 51 for detecting the temperature of refrigerant discharged from the compressor 1 (discharge refrigerant temperature) is provided near the discharge port of the compressor 1 in the refrigerant pipe 11. A compressor temperature sensor 52 for detecting the temperature of the compressor 1 is provided below the sealed container of the compressor 1.

  Between the water-refrigerant heat exchanger 3 and the first expansion valve 4 in the refrigerant pipe 11, a refrigerant temperature sensor 53 that detects the temperature of the refrigerant flowing into the first expansion valve 4 during heating operation or hot water supply operation, Between the 1st expansion valve 4 and the heat source side heat exchanger 5 in the refrigerant | coolant piping 11, the heat exchanger temperature sensor 54 which detects the temperature of the heat source side heat exchanger 5 is each provided.

  In the vicinity of the heat source side heat exchanger 5, an outside air temperature sensor 55 for detecting the outside air temperature is provided. Further, a pressure sensor 50 serving as a condensation pressure detecting means is provided on the refrigerant pipe 11 on the discharge side of the compressor 1 (between the four-way valve 2 and the water refrigerant heat exchanger 3).

  The water refrigerant heat exchanger 3 is connected to the refrigerant pipe 11 and the water pipe 16, and the water pipe 16 is provided with a circulation pump 30 for circulating water to the load terminal 40. The water exchanged with the refrigerant is configured to circulate in the direction of the arrow 80 shown in FIG. A return temperature sensor 56 that detects a return temperature that is the temperature of the water flowing into the water refrigerant heat exchanger 3 is disposed on the water inlet side of the water refrigerant heat exchanger 3 in the water pipe 16. On the water outlet side of the refrigerant heat exchanger 3, a forward temperature sensor 57 that detects a forward temperature that is the temperature of water flowing out of the water-refrigerant heat exchanger 3 is provided.

  In addition to the configuration described above, the heat pump cycle apparatus 100 is provided with a control means 60. The control means 60 inputs the temperature detected by each temperature sensor and the condensing pressure detected by the pressure sensor 50, or the compressor 1 and the circulation pump 30 according to the operation request from the user by a remote controller (not shown). Control of the heat pump cycle apparatus 100 such as drive control, switching control of the four-way valve 2, opening adjustment of the first expansion valve 4 and the second expansion valve 22, etc. is performed.

  Next, operation | movement of the refrigerant circuit 10 in the heat pump cycle apparatus 100 of this invention, and its effect | action and effect are demonstrated using FIG. In the following description, the refrigerant circuit 10 is in the heating cycle shown in FIG. 1 and the heat pump cycle device 100 performs a hot water supply operation, and the operation capability required by the load terminal 40 is high. An example will be described in which the compressor 1 is driven at a high rotational speed (for example, 120 rps) in order to set the forward temperature, which is the temperature of water flowing out of the heat exchanger 3, to a high temperature (for example, 90 ° C.). .

  Further, in FIG. 1, when the heat pump cycle device 100 is operated with the refrigerant circuit 10 as a heating cycle, the refrigerant flow direction is indicated by an arrow 70, and the refrigerant flows when the second expansion valve 22 is opened and the refrigerant flows into the injection pipe 14. Flow directions are indicated by arrows 90, respectively. In the heat pump cycle device 100, the refrigerant flow direction during the defrosting operation in which the refrigerant circuit 10 is operated as a cooling cycle is the refrigerant flow direction when operated as a heating cycle except between the compressor 1 and the four-way valve 2. Although the direction is opposite to the direction of arrow 70, the description of the refrigerant flow direction during the defrosting operation is omitted. During the defrosting operation, the second expansion valve 22 is fully closed.

  When the user operates a remote controller (not shown) of the load terminal 40 to instruct the start of the hot water supply operation, the control means 60 rotates the circulation pump 30 to supply water between the water / refrigerant heat exchanger 3 and the load terminal 40. While circulating, the four-way valve 2 is switched so that the refrigerant circuit 10 becomes a heating cycle, the compressor 1 is started, and the hot water supply operation of the heat pump cycle apparatus 100 is started. When the compressor 1 is started, the refrigerant flows through the refrigerant circuit 10 as indicated by an arrow 70. That is, the high-temperature and high-pressure refrigerant discharged from the compressor 1 flows into the water refrigerant heat exchanger 3 through the four-way valve 2. The high-temperature and high-pressure refrigerant that has flowed into the water-refrigerant heat exchanger 3 circulates in the water pipe 16, exchanges heat with the water that flows into the water-refrigerant heat exchanger 3, condenses, and flows out of the water-refrigerant heat exchanger 3. To do. The refrigerant flowing out of the water refrigerant heat exchanger 3 is decompressed when passing through the first expansion valve 4 and flows into the heat source side heat exchanger 5. The refrigerant flowing into the heat source side heat exchanger 5 evaporates by exchanging heat with the outside air. The refrigerant flowing out from the heat source side heat exchanger 5 is sucked into the compressor 1 through the four-way valve 2 and compressed again.

  Next, the flow of water in the water pipe 16 will be described. The water circulating through the water pipe 16 by the driving of the circulation pump 30 flows as shown by an arrow 80 in FIG. That is, the water flowing through the water pipe 16 and flowing into the water refrigerant heat exchanger 3 circulates in the refrigerant circuit 10 and exchanges heat with the refrigerant flowing into the water refrigerant heat exchanger 3 to be heated to become hot water. It flows out of the water refrigerant heat exchanger 3. The hot water flowing out from the water-refrigerant heat exchanger 3 flows into the load terminal 40, dissipates heat at the load terminal 40, and flows out from the load terminal 40. The water flowing out from the load terminal 40 flows into the water refrigerant heat exchanger 3 again through the circulation pump 30.

  When the user operates a remote controller or the like to request a high driving capability, the discharge refrigerant temperature of the compressor 1 becomes high. Therefore, the control means 60 supplies the liquid to the compressor 1 for the purpose of lowering the discharge refrigerant temperature of the compressor 1. Perform injection. Specifically, the control means 60 adjusts the opening degree of the second expansion valve 22 according to the rotation speed of the compressor 1 or the discharge refrigerant temperature. Thereby, as indicated by an arrow 90 in FIG. 1, an amount of refrigerant corresponding to the opening of the second expansion valve 22 flows into the injection pipe 14. When the refrigerant that has flowed in passes through the refrigerant cooling unit 8, it is cooled by air whose temperature is lower than that of the outside air by exchanging heat with the refrigerant in the heat source side heat exchanger 5. The refrigerant cooled by the refrigerant cooling unit 8 flows through the injection pipe 14 and is injected into the compressor 1 through the intermediate pressure unit 1a.

  As described above, in the heat pump cycle device 100 of the present invention, the refrigerant injected into the compressor 1 is cooled by exchanging heat with air lower than the outside air temperature in the refrigerant cooling unit 8 of the injection circuit 21, so that the load Even when the terminal 40 requires high capacity and the compressor 1 is driven at a high rotational speed, the compressor 1 can be effectively cooled. Therefore, the discharge refrigerant temperature of the compressor 1 can be lowered so as not to exceed the upper limit value.

  The refrigerant cooling unit 8 is not limited to the configuration as described above, and fins (not shown) may be attached to a part of the injection pipe 14 constituting the refrigerant cooling unit 8 to increase the heat exchange efficiency. . Further, in the present embodiment, the heat source side heat exchanger 5, the blower 7, and the refrigerant cooling unit 8 are arranged in the direction from the windward side to the leeward side in the flow of outside air in the ventilation path inside the housing (not shown) of the outdoor unit 9. However, the present invention is not limited to this, and the blower 7, the heat source side heat exchanger 5, and the refrigerant cooling unit 8 are arranged in this order from the windward side toward the leeward side. In addition, the refrigerant cooling unit 8 may be disposed on the leeward side of the heat source side heat exchanger 5. Moreover, although the present Example demonstrated the case where the refrigerant cooling part 8 was attached to a bell mouth or a fan guard, it is not restricted to this, For example, you may fix to the leeward side surface of the heat source side heat exchanger 5. .

  Further, in this embodiment, the hot water supply operation in which the hot water stored in the hot water storage tank is heated is described as an example, but the heat pump cycle device 100 of the present invention is not limited to this case, and is installed in a house with low heat insulation. When a heating unit such as a radiator is used as the load terminal 40 and hot indoor water is supplied to the load terminal 40 to perform indoor heating operation, the temperature of water flowing out of the water-refrigerant heat exchanger 3 (forward temperature) becomes high. It can be applied to such a heating operation.

DESCRIPTION OF SYMBOLS 1 Compressor 1a Intermediate pressure part 2 Four-way valve 3 Water refrigerant | coolant heat exchanger 4 1st expansion valve 5 Heat source side heat exchanger 6 Accumulator 8 Refrigerant cooling part 10 Refrigerant circuit 14 Injection piping 21 Injection circuit 22 2nd expansion valve 30 Circulation pump 40 Load Terminal 50 Pressure Sensor 51 Discharged Refrigerant Temperature Sensor 52 Compressor Temperature Sensor 53 Refrigerant Temperature Sensor 54 Heat Exchange Temperature Sensor 55 Outside Air Temperature Sensor 56 Return Temperature Sensor 57 Outward Temperature Sensor 60 Control Unit 70 Refrigerant Flow 80 Water Flow 90 Injecting Pipe Refrigerant flow of 100 heat pump cycle equipment

Claims (2)

A refrigerant circuit in which a compressor, a use side heat exchanger, a first expansion valve, and a heat source side heat exchanger are sequentially connected by a refrigerant pipe;
One end of the refrigerant circuit is connected to the refrigerant pipe between the use-side heat exchanger and the first expansion valve, and the other end is connected to the intermediate pressure portion of the compressor. A second expansion valve that adjusts the amount of refrigerant that is incorporated and flows through the injection pipe, and an injection circuit that includes a refrigerant cooling unit that cools the refrigerant that is incorporated into the injection pipe and flows through the injection pipe;
A heat pump cycle device including a blower disposed in the vicinity of the heat source side heat exchanger,
A heat pump cycle device in which the refrigerant cooling unit is arranged so that air that has passed through the heat source side heat exchanger by rotation of the blower passes through the refrigerant cooling unit.   The heat pump cycle device according to claim 1, wherein the refrigerant cooling unit is fixed to a leeward side surface of the heat source side heat exchanger.

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