阅读说明：本技术 旋转式压缩机 (Rotary compressor ) 是由 石部祐策 于 2018-03-07 设计创作，主要内容包括：本发明的旋转式压缩机具备：第一喷射流路,其向第一压缩室喷射制冷剂；第二喷射流路,其向第二压缩室喷射制冷剂；第一止回阀,其设置于第一喷射流路；第二止回阀,其设置于第二喷射流路。对第一止回阀的第一阀芯向打开第一喷射流路的方向作用有在第一喷射流路中存在于比该第一阀芯靠远离第一压缩室的一侧的制冷剂的压力,对第一止回阀的第一阀芯向关闭第一喷射流路的方向作用有第一压缩室的制冷剂的压力。对第二止回阀的第二阀芯向打开第二喷射流路的方向作用有在第二喷射流路中存在于比该第二阀芯靠远离第二压缩室的一侧的制冷剂的压力,对第二止回阀的第二阀芯向关闭第二喷射流路的方向作用有第二压缩室的制冷剂的压力。(The rotary compressor of the present invention comprises: a first injection flow path that injects the refrigerant into the first compression chamber; a second injection flow path that injects the refrigerant into the second compression chamber; a first check valve provided in the first injection flow path; and a second check valve provided in the second injection flow path. The pressure of the refrigerant existing in the first injection flow path on the side farther from the first compression chamber than the first valve element acts on the first valve element of the first check valve in the direction to open the first injection flow path, and the pressure of the refrigerant in the first compression chamber acts on the first valve element of the first check valve in the direction to close the first injection flow path. The pressure of the refrigerant existing in the second injection flow path on the side farther from the second compression chamber than the second valve element acts on the second valve element of the second check valve in the direction to open the second injection flow path, and the pressure of the refrigerant in the second compression chamber acts on the second valve element of the second check valve in the direction to close the second injection flow path.)

1. A rotary compressor is characterized by comprising:

a closed container; and

a rotary compression mechanism part which is accommodated in the closed container,

the compression mechanism includes:

a first suction port;

a first compression chamber that compresses the refrigerant sucked in from the first suction port;

a second suction inlet;

a second compression chamber that compresses the refrigerant sucked from the second suction port;

a first injection flow path that communicates with the first compression chamber at a position different from the first suction port and injects refrigerant into the first compression chamber;

a second injection flow path that communicates with the second compression chamber at a position different from the second suction port and injects the refrigerant into the second compression chamber;

a first check valve that is provided in the first injection flow path and restricts the flow of the refrigerant flowing out from the first compression chamber to the first injection flow path; and

a second check valve that is provided in the second injection flow passage and restricts the flow of the refrigerant flowing out from the second compression chamber to the second injection flow passage,

the first check valve has the following structure:

a first valve body which is provided so as to be movable in a reciprocating manner and opens and closes the first injection flow path,

a pressure of the refrigerant existing in the first injection flow path on a side farther from the first compression chamber than the first valve element acts on the first valve element in a direction to open the first injection flow path, and a pressure of the refrigerant in the first compression chamber acts in a direction to close the first injection flow path,

the second check valve is of the following structure:

a second valve body which is provided so as to be movable in a reciprocating manner and opens and closes the second injection flow path,

the pressure of the refrigerant existing in the second injection flow path on the side farther from the second compression chamber than the second valve spool acts on the second valve spool in the direction of opening the second injection flow path, and the pressure of the refrigerant in the second compression chamber acts in the direction of closing the second injection flow path.

2. The rotary compressor of claim 1,

as for the first valve spool, with respect to the first valve spool,

the area of the first pressure receiving portion that receives the pressure of the refrigerant that is present in the first injection flow path on the side farther from the first compression chamber than the first valve body is larger than the area of the second pressure receiving portion that receives the pressure of the refrigerant in the first compression chamber.

3. The rotary compressor of claim 2,

the first valve core is provided with a first through hole which penetrates along the reciprocating direction of the first valve core,

the first through hole becomes smaller in diameter as it goes toward the first compression chamber.

4. The rotary compressor of any one of claims 1 to 3,

as for the second spool, in the case of the second spool,

the area of the third pressure receiving portion receiving the pressure of the refrigerant existing on the side farther from the second compression chamber than the second valve spool in the second injection flow path is larger than the area of the fourth pressure receiving portion receiving the pressure of the refrigerant in the second compression chamber.

5. The rotary compressor of claim 4,

the second valve body is formed with a second through hole penetrating in a reciprocating direction of the second valve body,

the second through hole has a diameter that decreases as it goes toward the second compression chamber.

Technical Field

The present invention relates to a rotary compressor having a function of injecting (injecting) a refrigerant into a compression chamber.

Background

The compressor compresses a refrigerant sucked into the compression chamber from the suction port. As one of such compressors, a rotary compressor is known in which a rotary compression mechanism is housed in a sealed container. In addition, some conventional rotary compressors include a compressor in which an injection flow path communicating with a compression chamber at a position different from a suction port is provided in a compression mechanism portion for the purpose of improving the efficiency of a refrigeration cycle apparatus. The injection flow path is connected to an injection pipe provided outside the rotary compressor. The refrigerant supplied from the refrigerant circuit to the injection passage through the injection pipe is injected (injected) into the compression chamber.

In addition, a conventional rotary compressor is also known in which a compression mechanism portion has two compression chambers. Hereinafter, a rotary compressor having two compression chambers in a compression mechanism is referred to as a twin rotary compressor. In a conventional twin rotary compressor, there is also a compressor in which an injection flow path is provided in a compression mechanism section. In the case of the twin rotary compressor, the injection flow path communicates with the two compression chambers, respectively. That is, the refrigerant supplied from the inside of the refrigerant circuit to the injection passage through the injection pipe is injected into each of the two compression chambers.

Here, the dead volume is formed in the injection pipe and the injection flow path, and therefore, the compression efficiency of the compressor is reduced. The dead volume is a space communicating with the compression chamber during compression of the refrigerant, and is a space in which the refrigerant flowing out of the compression chamber is re-expanded. Therefore, a compressor including a check valve for restricting the flow of the refrigerant flowing out from the compression chamber to the injection flow passage in the injection flow passage has also been proposed as a conventional twin rotary compressor including the injection flow passage in the compression mechanism section (see patent document 1). In other words, the twin rotary compressor of patent document 1 includes a check valve that restricts the flow of the refrigerant flowing out from the compression chamber to the injection flow passage inside the closed casing. That is, in the twin rotary compressor described in patent document 1, the injection flow path is closed by the check valve in a state where the refrigerant is not injected from the injection flow path to the compression chamber. Therefore, by providing the check valve in this manner, the space on the upstream side of the check valve in the injection pipe and in the injection passage does not become a dead volume, and a decrease in the compression efficiency of the compressor can be suppressed. The injection pipe and the injection passage upstream of the check valve mean a portion of the injection pipe and the injection passage upstream of the check valve in the flow of the refrigerant during injection of the refrigerant. That is, the portion of the injection pipe and the injection passage located upstream of the check valve means the portion of the injection pipe and the injection passage located on the side farther from the compression chamber than the check valve.

Patent document 1: japanese patent laid-open publication No. 2013-36442

In the twin rotary compressor described in patent document 1, when the pressure of the refrigerant in the injection passage portion located upstream of the check valve becomes equal to or higher than a predetermined pressure, the check valve opens the injection passage, and both the injection passage and the compression chamber are in a state of communication. In this case, the check valve of the twin rotary compressor described in patent document 1 opens regardless of the pressure of the refrigerant in the compression chamber when the pressure of the refrigerant existing in the injection flow path portion upstream of the check valve becomes equal to or higher than a predetermined pressure. Therefore, in the twin rotary compressor described in patent document 1, when the pressure of the refrigerant in the two compression chambers is higher than the pressure of the refrigerant upstream of the check valve, the refrigerant during compression leaks from the compression chambers to the injection flow path. Further, the refrigerant leaks, so that the compression performance of the twin rotary compressor is degraded. That is, the conventional twin rotary compressor including the injection flow path in the compression mechanism and the check valve in the injection flow path has a problem of a decrease in compression performance due to leakage of the refrigerant from the compression chamber.

Disclosure of Invention

The present invention has been made to solve the above problems, and an object of the present invention is to provide a twin rotary compressor including an injection flow path in a compression mechanism portion and a check valve in the injection flow path, and capable of suppressing leakage of refrigerant from a compression chamber as compared with the conventional twin rotary compressor.

The rotary compressor of the present invention comprises: a closed container; and a rotary compression mechanism unit housed in the closed container, the compression mechanism unit including: a first suction port; a first compression chamber that compresses the refrigerant sucked in from the first suction port; a second suction inlet; a second compression chamber that compresses the refrigerant sucked from the second suction port; a first injection flow path that communicates with the first compression chamber at a position different from the first suction port and injects refrigerant into the first compression chamber; a second injection flow path that communicates with the second compression chamber at a position different from the second suction port and injects the refrigerant into the second compression chamber; a first check valve that is provided in the first injection flow path and restricts the flow of the refrigerant flowing out from the first compression chamber to the first injection flow path; and a second check valve that is provided in the second injection flow path and restricts a flow of the refrigerant flowing out from the second compression chamber to the second injection flow path, wherein the first check valve is configured as follows: the second check valve includes a first valve body that is provided so as to be movable in a reciprocating manner and opens and closes the first injection flow path, and a pressure of the refrigerant existing in the first injection flow path on a side farther from the first compression chamber than the first valve body acts on the first valve body in a direction of opening the first injection flow path, and a pressure of the refrigerant in the first compression chamber acts in a direction of closing the first injection flow path, and the second check valve is configured as follows: the second valve body is provided so as to be capable of reciprocating and opens and closes the second injection flow path, and a pressure of the refrigerant existing in the second injection flow path on a side farther from the second compression chamber than the second valve body acts on the second valve body in a direction of opening the second injection flow path, and a pressure of the refrigerant in the second compression chamber acts in a direction of closing the second injection flow path.

The rotary compressor of the present invention is a double rotary compressor having an injection flow path in a compression mechanism part and a check valve in the injection flow path. In the rotary compressor according to the present invention, when the pressure of the refrigerant in the first compression chamber is higher than the pressure of the refrigerant existing on the side of the first valve element away from the first compression chamber in the first injection flow path, the first injection flow path is not in communication with the first compression chamber. In the rotary compressor according to the present invention, when the pressure of the refrigerant in the second compression chamber is higher than the pressure of the refrigerant existing on the side of the second valve element away from the second compression chamber in the second injection flow path, the second injection flow path and the second compression chamber are not in communication with each other. Therefore, the rotary compressor of the present invention can suppress the leakage of the refrigerant from the compression chamber more than the conventional one.

Drawings

Fig. 1 is a refrigerant circuit diagram showing an example of a refrigeration cycle apparatus including a rotary compressor according to an embodiment of the present invention.

Fig. 2 is a longitudinal sectional view of a rotary compressor according to an embodiment of the present invention.

Fig. 3 is a sectional view a-a of fig. 2.

Fig. 4 is a sectional view B-B of fig. 2.

Fig. 5 is an enlarged view of a main portion of the rotary compressor according to the embodiment of the present invention, the main portion being around the first injection passage and the second injection passage.

Fig. 6 is an enlarged view of a main portion of the rotary compressor according to the embodiment of the present invention, the main portion being around the first injection passage and the second injection passage.

Fig. 7 is an enlarged view of a main portion of the periphery of the first injection flow path and the second injection flow path of an example of a conventional rotary compressor.

Fig. 8 is an enlarged view of a main portion of the periphery of the first injection flow path and the second injection flow path of another example of the conventional rotary compressor.

Fig. 9 is a diagram for explaining the operation of the first check valve and the second check valve in the rotary compressor according to the embodiment of the present invention.

Fig. 10 is an enlarged view of a main portion of the periphery of the first injection flow path and the second injection flow path of another example of the rotary compressor according to the embodiment of the present invention.

Fig. 11 is an enlarged view of a main portion of the periphery of the first injection flow path and the second injection flow path of another example of the rotary compressor according to the embodiment of the present invention.

Detailed Description