CN111065826B

CN111065826B - Hermetic compressor and refrigeration cycle device

Info

Publication number: CN111065826B
Application number: CN201780094614.2A
Authority: CN
Inventors: 平山卓也; 木村茂喜
Original assignee: Toshiba Carrier Corp
Current assignee: Toshiba Carrier Corp
Priority date: 2017-09-06
Filing date: 2017-09-06
Publication date: 2022-03-18
Anticipated expiration: 2037-09-06
Also published as: JPWO2019049226A1; DE112017007976T5; GB2579937A; DE112017007976B4; JP6886522B2; CN111065826A; GB2579937B; WO2019049226A1; GB202002843D0

Abstract

A compressor which is low in cost and high in quality is provided by optimizing the manufacturing by increasing the degree of freedom in designing the communication position between the introduction passage and the injection passage of the injection passage and opening and closing the check valve of the injection passage with high accuracy. The injection flow path includes: an injection passage provided in the closed member, one end of the injection passage opening into the cylinder chamber and the other end opening into the end plate side; a communication passage formed between the blocking member and an end plate overlapping the blocking member in the axial direction of the rotary shaft, and communicating with the injection passage; an introduction passage provided in either the closing member or the end plate, having one end opened to the communication passage in the axial direction of the rotary shaft and the other end connected to an injection introduction pipe communicating with the outside of the closed casing; and a check valve for opening and closing the opening on the communication path side of the introduction path and preventing the flow of the refrigerant from the cylinder chamber to the introduction path.

Description

Hermetic compressor and refrigeration cycle device

Technical Field

Embodiments of the present invention relate to a hermetic compressor and a refrigeration cycle device provided with an injection flow path.

Background

Conventionally, in a hermetic compressor, an injection flow path for introducing a liquid refrigerant of an intermediate pressure in a refrigeration cycle into a cylinder chamber of a compression mechanism portion is sometimes provided for cooling. The intermediate-pressure liquid refrigerant evaporates in the cylinder chamber, and the temperature of the discharge refrigerant discharged from the cylinder chamber is lowered.

In such a hermetic compressor, a check valve is provided in the middle of the injection flow path in order to reduce compression loss caused by backflow of the compressed refrigerant from the cylinder chamber to the injection flow path.

Documents of the prior art

Patent document

Patent document 1: japanese Kokai No. 62-173585

Patent document 2: japanese patent No. 5760836

Disclosure of Invention

Problems to be solved by the invention

The injection flow path of the compressor described in patent documents 1 and 2 includes an introduction path for introducing the liquid refrigerant into the compression mechanism section, and an injection path for injecting the liquid refrigerant introduced through the introduction path into the cylinder chamber, the injection path being formed along the axial direction of the rotation shaft of the compressor, and the introduction path being formed along the radial direction. In this case, the degree of freedom in designing the position is limited in order to communicate the introduction path and the injection path.

Further, patent document 1 includes a communication pipe connected to the gas injection pipe, and a gas injection passage for injecting a refrigerant into the cylinder chamber. Since the check valve is provided in the direction orthogonal to the flow direction of the communication pipe, a slight gap is generated between the communication pipe and the check valve, and the compressed refrigerant flows backward to cause a compression loss.

Patent document 2 requires a highly accurate insertion of the slide valve in the middle of the injection introduction path, and is extremely poor in manufacturability.

The present invention addresses the problem of providing a compressor in which the degree of freedom in design of the position of communication between the introduction path and the injection path of the injection path is increased to improve manufacturability, and which prevents backflow of refrigerant from the check valve in the injection path to improve compression efficiency.

Means for solving the problems

In order to achieve the above object, the hermetic compressor according to the embodiment houses a motor unit and a compression mechanism unit in a hermetic case. The compression mechanism includes: a cylinder having a cylinder chamber; a sealing member fixed to one end surface of the cylinder to seal the cylinder chamber; an end plate overlapping the closing member; a roller eccentrically rotating in the cylinder chamber and compressing the refrigerant flowing into the cylinder chamber; and an injection flow path for supplying the refrigerant into the cylinder chamber. The injection flow path includes: and an injection passage provided in the closed member, one end of the injection passage opening into the cylinder chamber and the other end opening into the end plate side. Further provided with: a communication passage formed between the closing member and the end plate and communicating with the injection passage; an introduction passage provided in either the closing member or the end plate, having one end opened to the communication passage in the axial direction of the rotary shaft and the other end connected to an injection introduction pipe communicating with the outside of the closed casing; and a check valve for opening and closing the opening on the communication path side of the introduction path and preventing the flow of the refrigerant from the cylinder chamber to the introduction path.

In the hermetic compressor according to the embodiment of the present invention, it is preferable that a cross-sectional area of the communication passage side opening portion of the introduction passage is formed to be larger than a cross-sectional area of the cylinder chamber side opening portion of the injection passage.

In the hermetic compressor according to the embodiment of the present invention, it is preferable that a valve seat surface of the check valve and a joint surface of the closing member and the end plate are in the same plane.

In the hermetic compressor according to the embodiment of the present invention, it is preferable that the check valve moves in the axial direction to open and close the opening on the communication passage side of the introduction passage.

In the hermetic compressor according to the embodiment of the present invention, it is preferable that the check valve is pressed by a biasing member in a direction to close the opening on the communication passage side of the introduction passage.

In the hermetic compressor according to the embodiment of the present invention, it is preferable that the check valve has a disc shape, and a guide wall is formed to guide the check valve so that a position of the check valve does not deviate from a position of the communication path-side opening when the check valve blocks the communication path-side opening of the introduction path in the communication path.

In the hermetic compressor according to the embodiment of the present invention, it is preferable that the compression mechanism includes a plurality of cylinders, and the closing member for closing the cylinder chamber of one cylinder, the end plate for closing the cylinder chamber of the other cylinder, and the injection flow path are provided between the plurality of cylinders.

In the hermetic compressor according to the embodiment of the present invention, it is preferable that the end plate is provided with an auxiliary injection passage having one end opening to the cylinder chamber of the other cylinder and the other end opening to the communication passage.

In order to achieve the above object, a refrigeration cycle apparatus according to an embodiment includes: the hermetic compressor described above; a radiator connected to the hermetic compressor; an expansion device connected to the heat sink; and a heat absorber connected between the expansion device and the hermetic compressor.

Effects of the invention

The injection flow path is formed by an injection introduction pipe, an introduction path, a communication path, and an injection path provided in the sealing member and the end plate. Further, the introduction path and the injection path are connected by the communication path, and the degree of freedom in designing the communication position between the introduction path and the injection path can be improved. Further, since the check valve is provided to open and close the opening on the communication path side of the introduction path between the blocking member and the end plate, the check valve can reliably prevent the reverse flow and reduce the flow path loss.

According to the present invention, there is provided a compressor capable of improving the degree of freedom in designing the communication position between the introduction passage and the injection passage of the injection passage to improve the manufacturability, and capable of preventing the refrigerant in the injection passage from flowing back from the check valve to improve the compression efficiency.

Drawings

Fig. 1 is a vertical sectional view of a hermetic compressor according to embodiment 1 and a refrigeration cycle configuration diagram of a refrigeration cycle apparatus.

Fig. 2 is a transverse sectional view of the compression mechanism according to embodiment 1.

Fig. 3 is a vertical cross-sectional view of the injection flow passage when the check valve according to embodiment 1 is closed.

Fig. 4 is a vertical cross-sectional view of the injection circuit when the check valve according to embodiment 1 is opened.

Fig. 5 is a vertical sectional view of the hermetic compressor according to embodiment 2 and a refrigeration cycle configuration diagram of the refrigeration cycle apparatus.

Fig. 6 is a vertical cross-sectional view of the injection flow passage when the check valve according to embodiment 2 is closed.

Fig. 7 is a plan view of the check valve viewed in the direction of the arrows of the section C-C of fig. 6.

Fig. 8 is a vertical cross-sectional view of the injection flow passage when the check valve according to embodiment 2 is open.

Fig. 9 is a plan view of the check valve as viewed in the direction of the arrows of the section C-C of fig. 8.

Detailed Description

Hereinafter, embodiments for carrying out the present invention will be described.

(embodiment 1)

The hermetic compressor according to embodiment 1 will be described with reference to fig. 1 to 4. Fig. 1 is a vertical sectional view of a hermetic compressor and a refrigeration cycle configuration diagram of a refrigeration cycle apparatus.

First, the refrigeration cycle 1 will be explained. In the refrigeration cycle 1, the following are connected in order by refrigerant piping: a hermetic compressor 2 (hereinafter, referred to as a compressor), a condenser 3 as a radiator, an expansion device 4, an evaporator 5 as a heat absorber, and a gas-liquid separator 6 attached to the compressor 2. The compressor 2 compresses a gas refrigerant, and the condenser 3 condenses the gas refrigerant discharged from the compressor 2 into a liquid refrigerant. The expansion device 4 is a decompressor for decompressing the refrigerant. The evaporator 5 evaporates the liquid refrigerant into a gas refrigerant. The gas-liquid separator 6 separates the gas refrigerant from the liquid refrigerant, and supplies the gas refrigerant to the compressor 2. In the refrigeration cycle 1 according to embodiment 1, an injection pipe 7 for guiding the liquid refrigerant having passed through the condenser 3 to the compressor 2 is provided, and communicates with an injection flow path 40 provided in the compressor 2.

The compressor 2 includes a sealed casing 10, a motor unit 14 provided on an upper side of the sealed casing 10, and a compression mechanism unit 17 provided on a lower side of the sealed casing 10. The motor unit 14 includes a stator (stator)15 fixed in the sealed casing 10 and a rotor (rotor)16 fixed to the rotating shaft 12. An eccentric portion 13 is provided on the opposite side of the motor portion 14 with respect to the rotary shaft 12, and a compression mechanism portion 17 is provided at a position corresponding to the eccentric portion 13. Therefore, the motor unit 14 and the compression mechanism unit 17 are coupled to each other via the rotary shaft 12.

The compression mechanism 17 includes a cylinder 18 fixed to the hermetic case 10. A cylinder chamber 19 is formed inside the cylinder 18. A main bearing 25 and a sub bearing 26 as a sealing member are disposed above and below the cylinder 18. A muffler 27 having a muffler chamber 28 formed by a hollow shell surrounding the flange portion 25f is attached to the flange portion 25f of the main bearing 25.

The eccentric portion 13 of the rotating shaft 12 is located in the cylinder chamber 19, and the roller 22 is rotatably fitted to the eccentric portion 13. The roller 22 is arranged to eccentrically rotate while bringing the outer peripheral wall into line contact with the inner peripheral surface of the cylinder 18 via a liquid film when the rotary shaft 12 rotates. The cylinder 18 is formed with vane grooves 24. The vane 23 is housed in the vane groove 24, and the vane 23 is pressed in a direction in which the tip end of the vane abuts against the outer peripheral wall of the roller 22 as shown in fig. 2 while reciprocating in the vane groove 24. The vane 23 divides the cylinder chamber 19 into two

spaces

19a, 19 b.

The cylinder 18 is provided with a suction port 20 for guiding the gas refrigerant supplied from the gas-liquid separator 6 to the cylinder chamber 19, and one of the spaces partitioned by the vane 23 in which the suction port 20 is located is referred to as a suction chamber 19a, and the other is referred to as a compression chamber 19 b. That is, as shown in fig. 2, the roller 22 rotates counterclockwise in the planar direction. At this time, the suction port 20 is provided on the left side of the vane 23, the left side of the cylinder chamber 19 becomes the suction chamber 19a, and the right side becomes the compression chamber 19 b.

The main bearing 25 is provided with a discharge port, not shown, and a discharge valve for opening and closing the discharge port. When the refrigerant in the cylinder chamber 19 is compressed and the pressure rises, the discharge valve opens, and the refrigerant in the cylinder chamber 19 passes through the discharge port and is discharged to the muffling chamber 28. Further, the refrigerant is discharged from the muffling chamber 28 into the sealed casing 10, and the compressed refrigerant discharged into the sealed casing 10 is discharged to the outside of the compressor 2 through the discharge pipe 11.

Next, the injection pipe 7 and the injection passage 40 will be described. As described above, the injection pipe 7 according to embodiment 1 guides the liquid refrigerant condensed by the condenser 4 of the refrigeration cycle 1 to the compressor 2. The liquid refrigerant passing through the injection pipe 7 flows into the injection flow path 40 and is injected into the cylinder chamber 19.

As shown in fig. 1 and 4, the injection passage 40 is composed of an injection passage 41, a communication passage 42, an introduction passage 49, an injection introduction pipe 70, and a check valve 44 provided in the communication passage 42. The

passages

41, 42, 49 are provided in the sub-bearing 26 that closes the lower side of the cylinder chamber 19, and in the end plate 30 that is overlapped on the lower side of the flange portion 26f of the sub-bearing 26 and is fixed by the fastening bolt 31. Further, the injection pipe 7 is provided with a control valve 8, and the control valve 8 reduces the pressure of the refrigerant introduced from the downstream side of the condenser 4 and adjusts the injection flow rate.

The injection passage 41 is provided in the sub-bearing 26, and has a 1 st opening 51 that opens into the cylinder chamber 19 and a 2 nd opening 52 that opens into the end plate 30. As shown in fig. 2, the 1 st opening 51 for injecting the intermediate-pressure liquid refrigerant into the cylinder chamber 19 is provided at a position opened and closed by the lower surface of the roller 22 disposed in the cylinder chamber 19.

The communication passage 42 is formed by the end plate 30 and the sub-bearing 26. A groove 43 is provided on the upper end surface of the end plate 30, and the groove 43 serves as the communication passage 42 by overlapping the end plate 30 with the sub-bearing 26. The communication passage 42 communicates with the injection passage 41 through the 2 nd opening 52 of the injection passage 41.

The introduction passage 49 is provided horizontally in the radial direction of the sub bearing 26, and has a 3 rd opening 53 that opens to the communication passage 42 in the axial direction on one end side, and the other end 54 opens to the outer peripheral surface of the sub bearing 26. The other end 54 of the introduction passage 49 is connected to an injection introduction pipe 70 communicating with the outside of the sealed case 10, and the injection pipe 7 is connected to the outside of the sealed case 10 in the injection introduction pipe 70. The cross-sectional area of the 3 rd opening 53 of the introduction passage 49 is formed larger than the cross-sectional area of the 1 st opening 51 of the injection passage 41.

The check valve 44 opens and closes the 3 rd opening 53 of the introduction passage 49 from the communication passage 42 side. The check valve 44 of embodiment 1 is a disk-shaped free valve and is biased by a spring 46. The valve seat surface 45a of the check valve 44, which contacts the sub-bearing 26, and the joint surface of the sub-bearing 26 and the end plate 30 are located on the same plane. The check valve 44 is pressed by the spring 46 in a direction to close the 3 rd opening 53. Fig. 3 shows the injection passage 40 when the check valve 44 closes the 3 rd opening 53 of the introduction passage 49, and fig. 4 shows the injection passage 40 when the check valve 44 opens the 3 rd opening 53.

The check valve 44 opens and closes the 3 rd opening 53 of the introduction passage 49 by a pressure difference between the introduction passage 49 and the communication passage 42. The communication passage 42 communicates with the cylinder chamber 19 via the injection passage 41. That is, when the pressure of the compression chamber 19b is higher than the pressure of the introduction passage 49, the check valve 44 closes the 3 rd opening 53 of the introduction passage 49, and when the pressure of the compression chamber 19b is lower than the pressure of the introduction passage 49, the check valve 44 is pushed out by the refrigerant pressure on the side of the introduction passage 49 to open the 3 rd opening 53 of the introduction passage 49.

In such a configuration, the rotor 16 is rotated by energizing the motor portion 14 of the compressor 2. With this rotation, the compression mechanism 17 is driven via the rotary shaft 12. When the compression mechanism 17 is driven, the gas refrigerant separated in the gas-liquid separator 6 is drawn into the suction chamber 19a of the cylinder chamber 19. By the rotation of the roller 22 in the cylinder chamber 19, the 1 st opening 51 formed in the injection passage 41 of the cylinder 18 is opened while the roller 22 passes over the suction port 20. The gas refrigerant sucked from the suction port 20 is compressed by the rotation of the roller 22, and the intermediate-pressure liquid refrigerant is injected into the compression chamber 19b from the 1 st opening 51 of the injection passage 41 opened and closed by the rotation of the roller 22, evaporates in the compression chamber 19b, cools the refrigerant in the compression chamber 19b, and is discharged from the discharge port together with the refrigerant sucked from the suction port 20. The refrigerant discharged from the discharge port is discharged to the outside of the compressor 2 through the muffling chamber 28, and the refrigerant condensed in the condenser 3 is guided to the compressor 2 through the branched injection pipe 7.

The liquid refrigerant introduced from the injection pipe 7 flows into the introduction passage 49 through the injection introduction pipe 70 of the injection passage 40 in the compressor 2. Subsequently, the fluid flows toward the 3 rd opening 53 of the introduction passage 49, but the 3 rd opening 53 of the introduction passage 49 is normally closed by the check valve 44. When the pressure of the introduction passage 49 is higher than the pressure in the cylinder chamber 19, the check valve 44 is pressed toward the communication passage 42 to open the 3 rd opening 53 of the introduction passage 49, and the liquid refrigerant flows into the communication passage 42. When the pressure of the introduction passage 49 is again lower than the pressure of the cylinder chamber 19, the check valve 44 closes the 3 rd opening 53.

The liquid refrigerant that has flowed into the communication passage 42 flows into the injection passage 41 through the 2 nd opening 52 of the injection passage 41. As described above, the liquid refrigerant flowing into the injection passage 41 is injected into the cylinder chamber 19 when the 1 st opening 51 of the injection passage 41, which is opened and closed by the lower surface of the roller 22 rotating in the cylinder chamber 19, is opened.

The injection flow path 40 of embodiment 1 includes the injection path 41 and the introduction path 49 in the sub-bearing 26 and the communication path 42 in the end plate 30, but may be formed by combining the sub-bearing 26 and the end plate 30 to form the communication path 42, the 3 rd opening 53 of the introduction path 49 opens in the axial direction, and the seat surface 45a of the check valve 44 provided in the communication path 42 and the joint surface where the sub-bearing 26 and the end plate 30 are joined are the same surface. For example, the groove portion 43 is provided in the flange portion 26f of the sub-bearing 26, and the end plate 30 is fixed to form the communication passage 42. In this case, if the introduction passage 49 is formed in the end plate 30, the 3 rd opening 53 may be opened in the axial direction, the valve seat 45 of the check valve 44 and the joint surface of the end plate 30 and the sub-bearing 26 may be the same surface, and the opening and closing may be performed from the upper side of the 3 rd opening 53.

According to the compressor 2 of embodiment 1, the injection passage 40 is formed by the injection introduction pipe 70, the introduction passage 49, the communication passage 42, and the injection passage 41. Since these flow passages are provided in the sub-bearing 26 and the end plate 30, and the introduction passage 49 and the injection passage 41 are connected by the communication passage 42, the degree of freedom in designing the communication position between the introduction passage 49 and the injection passage 41 can be increased.

Regarding the introduction passage 49 and the injection passage 41, the cross-sectional area of the 3 rd opening 53 of the introduction passage 49 is formed larger than the cross-sectional area of the 1 st opening 51 of the injection passage 41. The flow rate of the liquid refrigerant on the introduction passage 49 side is increased, and the liquid refrigerant is easily injected into the cylinder chamber 19. Further, by increasing the cross section of the 3 rd opening 53 of the introduction passage 49, the passage resistance of the liquid refrigerant received by the check valve 44 can be reduced, and therefore, the passage loss can be reduced. Therefore, the compressor has improved cooling capacity and high reliability.

Furthermore, since the check valve 44 for preventing the backflow of the compressed refrigerant from the cylinder chamber 19 is provided in the communication passage 42 in the axial direction so as to open and close the 3 rd opening 53 of the introduction passage 49, the backflow can be reliably prevented, and the passage loss can be reduced.

Further, the end plate 30 is fixed to the sub-bearing 26 to form the communication passage 42, and the joint surface thereof needs to be sealed, so that the surface roughness is small and the accuracy is high. If the seat surface 45a of the check valve 44 is provided on the joint surface, the sealing performance can be improved. Further, since the sub-bearing 26 and the end plate 30 are positioned and fixed, the spring 46 that regulates the movement of the check valve 44 is provided in the end plate 30, and thus the check valve 44 can be prevented from being displaced from the opening/closing surface.

The check valve 44 is pressed and biased by the spring 46 in a direction to close the 3 rd opening 53 of the introduction passage 49. The spring 46 can reliably prevent a reverse flow from the cylinder chamber 19 to the inlet passage 49. Further, a guide not shown may be provided on the valve seat surface. This guide can prevent the check valve 44 from being displaced from the 3 rd opening of the introduction path.

(embodiment 2)

A compressor 2 according to embodiment 2 will be described with reference to fig. 5 to 9. The same or similar elements as those in embodiment 1 are denoted by the same reference numerals, and overlapping description thereof is appropriately omitted.

The compressor 2 of embodiment 2 includes two

cylinders

18A and 18B in the compression mechanism 17, with the a cylinder 18A located on the lower side and the B cylinder 18B located on the upper side. A partition plate 32 that partitions the two

cylinders

18A, 18B and closes the cylinder chamber 19A of the a cylinder 18A and the cylinder chamber 19B of the B cylinder 18B is provided between the two

cylinders

18A, 18B. The partition 32 is formed by overlapping two

partition members

32A, 32B.

In the compressor 2 of embodiment 2, the partition plate 32 is provided with the injection flow path 40. That is, the partition plate 32 functions as a sealing member that seals the cylinder chamber 19B of the B cylinder 18B and an end plate that seals the cylinder chamber 19A of the a cylinder 18A.

As shown in fig. 6 and 8, the partition member 32B is provided with an injection passage 41 for injecting the liquid refrigerant into the cylinder chamber 19B, and the partition member 32A is provided with an auxiliary injection passage 50 for injecting the liquid refrigerant into the cylinder chamber 19A. The injection passage 41 has a 1 st opening 51 that opens into the cylinder chamber 19B of the B cylinder 18B and a 2 nd opening 52 that opens into the communication passage 42. One end of the auxiliary injection passage 50 forms a 5 th opening that opens into the cylinder chamber 19A of the a cylinder 18A, and the other end opens into the communication passage 42. The communication path 42 is formed by overlapping a groove portion 43 provided in the partition member 32B with an end face of the partition member 32A. The introduction passage 49 is provided horizontally in the radial direction in the partition member 32A, and has a 3 rd opening 53 of the introduction passage 42 that opens to the communication passage 42 in the axial direction on one end side, and the other end 54 opens to the outer peripheral surface of the partition member 32A. The other end 54 of the introduction passage 49 is connected to an injection introduction pipe 70 communicating with the outside of the sealed case 10, and the injection pipe 7 is connected to the outside of the sealed case 10 in the injection introduction pipe 70.

In the compressor 2 according to embodiment 2, the communication passage 4 is formed above the 3 rd opening 53 of the introduction passage 49. A check valve 44 for opening and closing the 3 rd opening 53 of the introduction passage 49 is provided on the communication passage 42 side. The check valve 44 of embodiment 2 contacts the valve seat 45 by gravity to close the 3 rd opening 53 of the introduction passage 49. When the pressure of the introduction passage 49 becomes high, the check valve 44 is lifted up, and the 3 rd opening 53 of the introduction passage 49 is opened. Therefore, the biasing member such as the spring 46 can be omitted. However, also in the case of embodiment 2, an urging member such as a spring 46 may be provided in order to reliably operate the check valve 44. Further, a guide wall 47 is formed, and the guide wall 47 guides the check valve 44 so that the position of the check valve 44 does not deviate from the 3 rd opening 53 of the introduction passage 49. In order to prevent the check valve 44 from sticking to the upper portion of the guide wall 47, a check valve back pressure portion 48 is provided in which the depth of the guide wall 47 is made shallower than the depth of the communication passage 42.

In such a configuration, the liquid refrigerant flowing through the injection pipe 7 is injected into the

cylinder chambers

19A and 19B through the injection introduction pipe 70, the introduction passage 49, the communication passage 42, the injection passage 41, and the auxiliary injection passage 50, as in embodiment 1. At this time, the check valve 44 opens and closes the 3 rd opening 53 of the introduction passage 49 by a difference between the pressure of the introduction passage 49 and the total pressure of the gravity and the

cylinders

18A and 18B.

Fig. 7 is a plan view of the check valve 44 viewed in the direction of the arrow in the section C-C of fig. 6. Likewise, fig. 9 is a plan view of the check valve 44 viewed in the direction of the arrow in the section C-C of fig. 8. Further, a guide wall 47 that guides the check valve 44 so as to close the 3 rd opening 53 of the introduction passage 49 without deviating from it is formed in the partition member 32B. As shown in fig. 9, the guide wall 47 is formed to have a slightly larger diameter than the check valve 44.

According to the compressor 2 of embodiment 2, even in the rotary compressor having two

cylinders

18A and 18B, the liquid refrigerant can be supplied to the

cylinder chambers

19A and 19B by forming the injection flow path 40 in the partition plate 32 formed of the two

partition plate members

32A and 32B.

Since the check valve 44 is provided in the 3 rd opening 53 of the introduction passage 49 before the liquid refrigerant flowing into the injection passage 40 is branched into the injection passage 41 and the auxiliary injection passage 50, the backflow from each of the

cylinder chambers

19A and 19B can be prevented by one check valve 44.

According to the compressor 2 of at least one embodiment described above, the injection passage 40 for guiding the liquid refrigerant to the cylinder chamber 19 of the compression mechanism portion 17 is constituted by the injection introduction pipe, the introduction passage 49, the injection passage 41, and the communication passage 42 for communicating the introduction passage 49 with the injection passage 41. The communication passage 42 is formed by combining the two members of the blocking

members

26, 32A and the

end plates

30, 32B, and the introduction passage 49 can be formed in any one of the blocking

members

26, 32A or the

end plates

30, 32B, and the degree of freedom in designing the communication position between the introduction passage 49 and the injection passage 41 can be increased. The check valve 44 provided in the communication passage 42 opens and closes the 3 rd opening 53 of the introduction passage 49 that opens in the axial direction of the rotary shaft 12, and the seat surface 45a is formed in the same plane as the blocking

members

26, 32A and the

end plates

30, 32B that have small surface roughness and are formed with high accuracy, so that the sealing property of the seat surface 45a can be improved. Therefore, the refrigerant can be prevented from flowing backward from the check valve 44.

Further, by adopting the configuration in which the check valve 44 of embodiment 1 is provided with the spring 46 or the configuration in which the guide wall 47 of embodiment 2 is provided, the check valve 44 can be opened and closed with high accuracy. Further, although the check valve 44 of the embodiment is described as a check valve 44 formed of a free valve, a reed valve may be used.

Further, regarding the introduction passage 49 and the injection passage 41, the cross-sectional area of the 3 rd opening 53 of the introduction passage 49 is formed larger than the cross-sectional area of the 1 st opening 51 of the injection passage 41. Thus, the flow rate on the introduction passage 49 side is increased, whereby the refrigerant flowing through the injection passage 40 is easily injected into the cylinder chamber 19. Further, by increasing the cross section of the 3 rd opening 53 of the introduction passage 49, the passage resistance of the liquid refrigerant received by the check valve 44 can be reduced, and therefore, the passage loss can be reduced. With the above configuration, the compressor 2 having improved cooling capacity and high reliability can be provided.

The compressor 2 according to the embodiment is applicable even when a plurality of cylinders 19 are provided, and has a structure in which two

partition plate members

32A and 32B are stacked in the axial direction and the injection flow path 40 is provided separately. With such a structure, backflow from the plurality of cylinder chambers 19 can be prevented by one check valve 44, and therefore, the compressor 2 can be manufactured at high cost with a simplified structure.

Further, although the compressor 2 of the embodiment is a rotary compressor using the vane 23 and the roller 22, the same effect can be obtained even when the injection flow path 40 of the embodiment is formed in a swing type compressor in which the vane 23 and the rotor 22 are integrated.

Several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in other various manners, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. The embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.

Description of the symbols

1 … refrigeration cycle device, 2 … compressor, 3 … condenser, 4 … expansion device, 5 … evaporator, 6 … gas-liquid separator, 7 … injection pipe, 10 … sealed housing, 12 … rotating shaft, 14 … motor part, 17 … compression mechanism part, 18 … cylinder, 19 … cylinder chamber, 22 … roller, 23 … blade, 25 … main bearing, 26 … auxiliary bearing, 30 … end plate, 32 … partition plate, 32A, 32B … partition plate member, 40 … injection flow path, 41 … injection path, 42 … communicating path, 44 … check valve, 47 … guide wall, 49 … introduction path, 50 … partition plate flow path, 51 … 1 st opening part, 52 … nd opening part, 53 … rd 3 rd opening part, and 54 … other end of … introduction path.

Claims

1. A hermetic compressor, wherein,

comprises a motor part and a compression mechanism part which are accommodated in a sealed shell,

the compression mechanism unit is driven by the motor unit via a rotating shaft having an eccentric portion, and includes:

a cylinder having a cylinder chamber;

a sealing member fixed to one end surface of the cylinder and sealing the cylinder chamber;

an end plate overlapping the closure member;

a roller that eccentrically rotates in the cylinder chamber and compresses the refrigerant flowing into the cylinder chamber; and

an injection flow path for supplying a refrigerant into the cylinder chamber,

the compression mechanism unit includes a plurality of cylinders, and the closing member that closes the cylinder chamber of one cylinder, the end plate that closes the cylinder chamber of the other cylinder, and the injection flow path are provided between the plurality of cylinders,

the injection flow path includes:

an injection passage provided in the closing member, one end of the injection passage opening to the cylinder chamber of the one cylinder, and the other end of the injection passage opening to the end plate side;

a communication passage formed between the blocking member and the end plate and communicating with the injection passage;

an introduction passage provided in either the seal member or the end plate, one end of which opens to the communication passage in the axial direction of the rotary shaft, and the other end of which is connected to an injection introduction pipe that communicates with the outside of the sealed housing;

an auxiliary injection passage provided in the end plate, one end of the auxiliary injection passage opening into the cylinder chamber of the other cylinder, and the other end of the auxiliary injection passage opening into the communication passage; and

and a check valve disposed in the communication passage, and configured to open and close a communication passage side opening portion, which is an opening connecting the introduction passage and the communication passage, from the communication passage side, and to collectively block a flow of the refrigerant from the cylinder chamber of the one cylinder to the introduction passage via the injection passage and a flow of the refrigerant from the cylinder chamber of the other cylinder to the introduction passage via the auxiliary injection passage.

2. The hermetic compressor according to claim 1, wherein,

the cross-sectional area of the communication-passage-side opening of the introduction passage is formed larger than the cross-sectional area of the cylinder-chamber-side opening of the injection passage.

3. The hermetic compressor according to claim 1, wherein,

the seat surface of the check valve and the joint surface of the closing member and the end plate are in the same plane.

4. The hermetic compressor according to claim 1, wherein,

the check valve moves in the axial direction to open and close an opening on the communication path side of the introduction path.

5. The hermetic compressor according to claim 1, wherein,

the check valve is pressed by a biasing member in a direction to close an opening on the communication path side of the introduction path.

6. The hermetic compressor according to claim 1, wherein,

the check valve is disc-shaped, and a guide wall is formed to guide the check valve so that the position of the check valve does not deviate from the communication path-side opening when the check valve blocks the communication path-side opening of the introduction path in the communication path.

7. A refrigeration cycle device is provided with:

the hermetic compressor of any one of claims 1 to 6;

a radiator connected to the hermetic compressor;

an expansion device connected to the heat sink; and

and a heat absorber connected between the expansion device and the hermetic compressor.