JPS60138380A - Refrigerant circulator for air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a refrigerant circulation device used, for example, in the cycle of an air-cooled heat pump type air conditioner.

[Background of the invention]

FIG. 1 shows a diagram of a refrigeration cycle according to the prior art.

The basic refrigerant circuit of an air-cooled heat pump type air conditioner includes a refrigerant compressor 1, a four-way switching valve 2, an outdoor heat exchanger 8, a pressure reducing device 4,
A reversible refrigerant refrigeration circuit is formed by sequentially connecting the indoor heat exchangers 6 through piping. During cooling operation, the high-pressure midstream liquid refrigerant obtained in the outdoor heat exchanger 8 is transferred to the outdoor heat exchanger pressure reducing device 4a.
Directly connect the indoor heat exchanger 6 through the check valve 81L'r without passing through the indoor heat exchanger 6.
The pressure reducing device 4 is directly discharged to the pressure reducing device 4b at the inlet of the
This avoids unnecessary pressure drop due to a. In addition, during heating operation, high-pressure medium-temperature liquid refrigerant is obtained in the internal heat exchanger 6.
Flows directly to the pressure reducing device 4a of the outdoor heat exchanger 8 through the reverse valve 8b without passing through the indoor heat exchanger pressure reducing device 4b, thereby eliminating unnecessary pressure caused by the pressure reducing device 4b as in the case of cooling. Avoiding descent.

On the other hand, each pressure reducing device 4 has a plurality of pressure reducing pipes 4a, 4.
The high pressure, medium temperature refrigerant flowing from the flow divider 5a2.51) 2, which divides the refrigerant, is depressurized and converted into a low pressure, low temperature refrigerant in such a number that the pressure drop within the heat exchanger is reduced to some extent. The water is divided and flows out to the heat exchanger side.

The number of buses is determined so that the resistance of one divided flow in the heat exchanger, that is, one pass, is a certain small value, but the number of buses is determined depending on the vertical positional relationship in the heat exchanger. Even if the contact length is the same, the amount of refrigerant flowing will be different. To prevent this, install the same number of pressure reducing pipes as the number of passes, so that if the flow flows from the pressure reducing pipes, it goes directly to the population of each pass of the heat exchanger, and if it flows out from the heat exchanger, it goes through the heat exchanger. The water flows directly from the vessel's flow divider to the inner and outer connecting pipes.

If the heat exchanger is small, the number of passes will be small and the size of the unit to be installed will be small, but even if you install the same number of pressure reducing pipes as the number of passes, the refrigerant distribution in the heat exchanger will not be affected too much, so it will not be effective. Although it is small, the cost of pressure reducing pipes, etc. remains the same, making it relatively expensive overall. For this reason, even if a single pressure reducing pipe is used, as described earlier, the refrigerant leaving the heat exchanger will be depressurized and gasified when passing through the pressure reducing device, resulting in a large pressure drop between the inner and outer connecting pipes, resulting in a stable In order to prevent this, a check valve to bypass the liquid refrigerant to the connecting pipe and cycle piping for this purpose are required, and in order to miniaturize the unit, it is necessary to Work and various service spaces become smaller, making it difficult to work, making it difficult to downsize, and causing defects in brazing work, etc.

easy to cause.

[Purpose of the invention]

The object of the present invention is to provide a refrigerant circulation device for reversible refrigerant flow that is inexpensive and compact.

[Summary of the invention]

In order to achieve the above object, the present invention communicates both ends of a closed pipe through a pressure reducing means, provides a strainer and a check valve device inside the closed pipe, and provides a gap between the strainer and the check valve device. A refrigerant inlet/outlet passage is opened in the closed tube body of the valve, and another refrigerant inlet/outlet passage is opened in the closed tube body between the check valve device and one end of the closed tube.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in FIGS. 2 to 8. In the figure, parts that are the same as or similar to those in FIG. 1 are represented by the same reference numerals, and their explanations will be omitted. Reference numeral 9 denotes a refrigerant circulation device, in which both ends of a sealed tube 10 are connected via a pressure reducing means 4, and a strainer 1 is installed inside the nuclear sealed tube IO.
1 and a check valve device 12, and a refrigerant inlet/outlet passage 1 is provided in the body of the sealed pipe 10 between the strainer 11 and the check valve device 12.
8 is opened, and another refrigerant inlet/outlet passage 14 is opened in the body of the seal 'u10 between the check valve device 12 and the tip of the sealing tube 10 on one side. One refrigerant circulation device 9 is connected to the refrigerant divider 5al of the outdoor heat exchanger 8 via a refrigerant inlet/outlet passage 14, and the other refrigerant circulation device 9 is connected to the indoor heat exchanger 6. . The two refrigerant circulation device refrigerant inlet/outlet passages 18 are connected by a pipe 15.

FIG. 2 shows a reversible refrigeration cycle using the refrigerant circulation device 9 described above. In the case of cooling operation in FIG. 2, in the reversible refrigerant flow decompression device, the refrigerant from the outdoor heat exchanger flows in from the refrigerant outlet 11, passes through the check valve section, and passes through the connecting pipe from the refrigerant inlet/outlet 10. The refrigerant flows into the refrigerant inlet/outlet 10 of the pressure reducing device for reversible refrigerant flow on the indoor heat exchanger side, passes through the strainer section, is depressurized in the pressure reducing pipe, becomes a low-pressure, low-temperature gas-liquid two-phase refrigerant, and is transferred to the reducing valve section. Return to the entrance side and refrigerant exit 11
The refrigerant flows out to the indoor heat exchange refrigerant flow divider 5a1.

Each inlet/outlet is made by molding the sealed tube 9, and the screen 91)l of the strainer 9b and the screen holder 9
After b2 is inserted into the sealed tube 9 as an integral part, it is rolled and caulked before and after the screen holder 9b2 to provide the necessary holding force. In addition, the valve 9al of the check valve 9a section uses a step provided by rolling throttling or expansion of the sealed pipe 9 (not shown) as a stopper of the valve 9al, and after inserting the valve gal, the valve seat 9a 2i is press-fitted or rolled throttling. The closed tube 9 is fixed at both ends, and a pressure reducing tube 4 having an inner diameter and length necessary for pressure reduction is brazed thereto. If the decompression tube 4 is long, it can be wrapped directly around the sealed tube 9, which is the main body of the circulation system, to reduce the space required, and at the same time, since it is connected to the same main body, the vibration frequency matches that of the main body. .

〔Effect of the invention〕

Since the present invention has the above-described structure, the strainer, check valve, pressure reducing flow divider, pressure reducing pipe, and attached pipes are all integrated, making it smaller and lighter. The number of locations is reduced to four in total, including the two locations on the decompression pipe and the decompression pipe, resulting in lower costs and fewer brazing defects.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a refrigeration cycle constructed by a conventional technique. FIG. 2 is a refrigeration cycle system diagram using the pressure reducing device according to the present invention. FIG. 8 is a cross-sectional view of the refrigerant circulation device for reversible refrigerant flow of the present invention. 1... Compressor 2... Four-way valve 8... Outdoor heat exchanger 6... Indoor heat exchanger 9... Refrigerant circulation device 10
... Sealed pipe 11 ... Strainer 12 River check valve device 1B, 14 ... Refrigerant inlet/outlet passage J1 leap

Claims (1)

[Claims] Both ends of the sealed pipe are communicated via a pressure reducing means, a strainer and a check valve device are provided inside the closed pipe, and a refrigerant inlet/outlet passage γ is opened in the body of the sealed pipe between the strainer and the check valve device. A refrigerant circulation device for an air conditioner, wherein another refrigerant inlet/outlet passage is opened in a closed tube body between the check valve device and the end portion of one side of the closed tube.