JPH0536265U - Heat pump heat exchanger for air conditioner - Google Patents

Abstract

(57) [Summary] [Purpose] By dividing the liquid header into multiple parts, the amount of refrigerant flowing down can be finely adjusted. [Structure] In a heat exchanger for a heat pump air conditioner, a liquid header 7 is divided into a plurality of liquid headers 7a and 7b, and check valves 5a and 5b are respectively connected to connecting circuits connected to lower portions of the divided liquid headers 7a and 7b. It is characterized by the provision of.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat exchanger for a heat pump air conditioner.

[0002]

[Prior Art]

 FIG. 2 shows a refrigerant circuit diagram of a known heat pump air conditioner. The dotted arrow indicates the heating circuit, and the solid arrow indicates the cooling circuit. 1 is a compressor, 2 is a four-way valve, 3 is an indoor heat exchanger, 4 is a cooling throttle capillary, 5 is a check valve, 6 is a heating throttle capillary, 7 is a header, 8 is an outdoor heat exchanger, 9 Is an accumulator.

In the system diagram of the conventional air conditioner shown in FIG. 2, during heating operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 as shown by a dashed arrow and the indoor heat exchange is performed. When it enters the exchanger 3, it radiates heat to the indoor air sent by the indoor fan 12 and becomes high-pressure liquid refrigerant. This liquid refrigerant is decompressed by the cooling capillary 4, then enters the heating capillary 6 through the connection circuit 14 of the high pressure liquid line, and is further decompressed there to become a gas-liquid two-phase outdoor heat exchanger 8 Then, the heat is absorbed from the outside air sent by the outdoor fan 13 and becomes a low-pressure gas refrigerant, and returns to the compressed air 1 through the four-way valve 2, the accumulator 9 and the suction pipe 10.

During cooling operation, the four-way valve 2 is switched, and the refrigerant discharged from the compressor 1 has a four-way valve 2, an outdoor heat exchanger 8, a check valve 5, a connecting circuit 14, and a cooling capillary as shown by a solid arrow. 4, the indoor heat exchanger 3, the four-way valve 2, the accumulator 9, and the suction pipe 10 are returned in this order to the compressor 1.

[0005]

[Problems to be solved by the device]

 In the refrigerant circuit of an air conditioner that has been generally used in the past, the outdoor heat exchanger 8 is often used in a tilted type (vertical length) rather than being used horizontally, so the outdoor heat exchanger 8 is used outdoors during heating operation. In the liquid header 7 of the heat exchanger 8, the development in which the refrigerant flows from the upper circuit to the lower circuit is more often seen. This causes inconveniences such as excessive refrigerant in the lower circuit, uneven throttle capillaries 6, and inability to use the heat exchanger 8 100% effectively.

The present invention was developed to address such a problem, and it is an object of the present invention to finely adjust the amount of refrigerant flowing down by arranging a liquid header in a plurality of divisions.

[0007]

[Means for Solving the Problems]

 The structure of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. In the present invention, the refrigerant flow passage is divided into a plurality of circuits, and the liquid header 7 is provided at the inlet / outlet portion of each circuit. In a heat exchanger for a heat pump air conditioner, the liquid header 7 is divided into a plurality of liquid headers 7a and 7b, and a reverse connection is made to a connecting circuit 14 connected to the lower portions of the divided liquid headers 7a and 7b. It is characterized in that stop valves 5a and 5b are provided.

[0008]

[Action]

 The present invention is divided into liquid headers by the above means, and a check valve is provided at the lower end of the liquid headers so that the amount of refrigerant flowing into the heat exchanger becomes uniform without flowing from the upper liquid header to the lower liquid header.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. 1. In the figure, reference numerals 1 to 14 are the same as those in the conventional example shown in FIG. Further, in the present invention, the liquid header 7 is divided into a plurality of liquid headers 7a and 7b, and is also connected to the connecting circuits 14 connected to the lower portions of the plurality of divided liquid headers 7a and 7b, respectively. Valves 5a and 5b are provided.

Thus, during the heating operation, the high-temperature, high-pressure refrigerant gas extruded from the compressor 1 passes through the four-way valve 2 and is condensed in the indoor heat exchanger 3 to become a liquid refrigerant. The flow rate of this liquid refrigerant passes through the cooling capillary 4 and is adjusted by the heating capillary 6 and expanded in the outdoor heat exchanger 8 to become a gas refrigerant, but part of it remains as the liquid refrigerant due to the low external temperature. The liquid headers 7a and 7b flow downwards, but in this case, the liquid headers 7a and 7b are divided like the liquid headers 7a and 7b and the check valves 5a and 5b are provided at the lower ends of the liquid headers 7a and 7b, so that the refrigerant does not flow into the liquid header 7b. Absent. The refrigerant flowing into the respective areas of the liquid headers 7a and 7b passes through the heat exchanger 8 in the respective areas to be vaporized to become a low-pressure gas refrigerant, return to the four-way valve 2, pass through the accumulator 9, and enter the compressor 1. Return.

[0011]

[Effect of the device]

 As described above, according to the present invention, the liquid header is divided into a plurality of parts, and a check valve is provided in each connecting circuit connected to the lower part of the plurality of divided liquid headers. Since the refrigerant does not flow out to the other area by the check valve, there is an effect that a part of the heat exchanger does not become excessive and the performance of the heat exchanger can be sufficiently exhibited.

[Brief description of drawings]

FIG. 1 is a refrigerant system diagram showing an embodiment of the present invention.

FIG. 2 is a refrigerant system diagram showing a conventional example.

[Explanation of symbols]

 7 Liquid Header 7a Divided Liquid Header 7b Divided Liquid Header 14 Connection Circuit 5a Split Check Valve 5b Split Check Valve

Claims (1)

[Scope of utility model registration request] 1. A heat exchanger for a heat pump air conditioner in which a refrigerant flow path is divided into a plurality of circuits and a liquid header is provided at an inlet / outlet of each circuit. A heat exchanger for a heat pump air conditioner, characterized in that a check valve is provided in each of the connecting circuits connected to the lower portions of the plurality of liquid headers.