EP3550147B1

EP3550147B1 - Compressor system

Info

Publication number: EP3550147B1
Application number: EP19167376.3A
Authority: EP
Inventors: Makoto Ogawa; Hajime Sato; Yoshiyuki Kimata; Ikuo Esaki; Masanari Uno; Hirofumi SHIMAYA
Original assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Current assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date: 2018-04-06
Filing date: 2019-04-04
Publication date: 2023-07-05
Anticipated expiration: 2039-04-04
Also published as: EP3550147C0; JP2019183720A; EP3550147A1

Description

Technical Field

The present invention relates to a compressor system.

Background Art

For example, as a device used for compressing a refrigerant in an air conditioner, a device equipped with an accumulator and a compressor is known (see PTL 1 below). The accumulator performs a gas-liquid separation of the refrigerant prior to introduction to the compressor. The compressor and the accumulator are connected to each other by a suction pipe. The compressor compresses only the vapor-phase refrigerant supplied from the accumulator through the suction pipe to generate a high-pressure gas-phase refrigerant.
More specifically, the compressor includes a compression mechanism unit which has a suction port for sucking in the refrigerant, a cylinder in which a compression chamber for compressing the sucked in refrigerant and a piston rotor rotating eccentrically in the cylinder are formed, and a housing that accommodates the compression mechanism unit. The high-pressure refrigerant generated in the compression chamber is discharged outside via a space inside the housing.

Citation List

Patent Literature

[PTL 1] Japanese Unexamined Patent Application, First Publication No. 2014-190267

Summary of Invention

Technical Problem

In this type of compressor, the suction pipe extends from the accumulator located outside the housing to a suction port in the housing. Here, the high-pressure refrigerant generated in the compression chamber circulates in the space inside the housing. The refrigerant has a higher temperature than the refrigerant before compression. Therefore, in the above configuration, there is a possibility that the heat of the high-pressure refrigerant will propagate to the refrigerant flowing through the suction pipe before compression. As a result, the efficiency of the compressor will decrease.
The present invention has been made to solve the aforementioned problems, and an object of the present invention is to provide a compressor system in which the efficiency of the compressor is able to be improved, while the suction pipe is reliably fixed to the suction port.

Solution to Problem

According to a first aspect of the present invention, there is provided a compressor system as defined in claim 1, including a crankshaft that is configured to rotate about an axis; a compression mechanism unit which includes a piston rotor that is configured to rotate eccentrically with rotation of the crankshaft, and a cylinder having a compression chamber accommodating the piston rotor formed inside; a housing which accommodates the crankshaft and the compression mechanism unit and through which a high-pressure refrigerant generated by the compression mechanism unit flows; an accumulator in which the refrigerant is stored; and a suction pipe in which an insertion end portion to be inserted into an suction port formed in the cylinder is formed at an end portion and which supplies the refrigerant before compression from the accumulator to the compression chamber. Between an outer peripheral surface of the insertion end portion and an inner peripheral surface of the suction port, an abutment region in which the outer peripheral surface of the insertion end portion and the inner peripheral surface of the suction port abut each other, and a non-abutment region forming a space between the outer peripheral surface of the insertion end portion and the inner peripheral surface of the suction port are formed.
According to this configuration, in the non-abutment region, a space is formed between the outer peripheral surface of the insertion end portion and the inner peripheral surface of the suction port. The inside of the housing and the inside of the suction pipe are separated from each other by the space. Therefore, it can be made difficult for the heat of the high-temperature and high-pressure refrigerant flowing through the housing to be transmitted to the refrigerant before compression flowing through the suction pipe. As a result, it is possible to minimize a temperature rise of the refrigerant before compression. On the other hand, in the abutment region, the outer peripheral surface of the insertion end portion abuts against the inner peripheral surface of the suction port. Accordingly, even when an external force is applied to the suction port or the insertion end portion due to the vibration of the suction pipe, it is possible to sufficiently resist the external force. Therefore, the insertion end portion can be firmly fixed to the suction port.
According to a second aspect of the present invention, the non-abutment region may be formed at least on one side in an axial line direction in which the axial line extends with respect to the insertion end portion.
According to this configuration, the non-abutment region A2 is formed in a portion in which the temperature easily rises. Therefore, it can be made difficult for the heat of the high-temperature and high-pressure refrigerant in the housing to be transmitted to the refrigerant in the suction pipe.
According to a third aspect of the present invention, the non-abutment region may be formed on both sides in the axial line direction with respect to the insertion end portion.
According to a fourth aspect of the present invention, the abutment region may be formed on both sides in a horizontal direction orthogonal to the axial line direction in which the axial line extends with respect to the insertion end portion.
According to a fifth aspect of the present invention, in the abutment region, the insertion end portion may abut the inner peripheral surface of the suction port in an elastically deformed state.
According to this configuration, the outer peripheral surface of the insertion end portion and the inner peripheral surface of the suction port are strongly brought into contact with each other by the restoring force caused by the elastic deformation. Therefore, the insertion end portion can be more firmly fixed to the suction port.
According to a sixth aspect of the present invention, the suction pipe may have a suction pipe main body which abuts the inner peripheral surface of the suction port over the entire circumference, and a connecting portion which connects the suction pipe main body and the insertion end portion, and a suction pipe end surface, which is an end surface of the insertion end portion, may abut a suction port bottom surface facing the suction pipe end surface in the suction port.
According to this configuration, in the non-abutment region, a space independent from the outside is formed by the outer peripheral surface of the insertion end portion, the suction port end surface, the inner peripheral surface of the suction port, and the outer peripheral surface of the connecting portion. That is, it is possible to form a space thermally independent from the outside, and to more effectively minimize heat transfer between the inside of the housing and the inside of the suction pipe.
According to the present invention, the suction port or the insertion end portion has a circular cross section. When the suction port has a circular cross section, the insertion end portion has an elliptical cross section, and an end edge in a major axis direction of the ellipse forms the abutment region, and an end edge in a minor axis direction forms the non-abutment region.
According to this configuration, it is possible to easily form the abutment region and the non-abutment region simply by making the insertion end portion have an elliptical cross section. As a result, the time required for and costs incurred in processing can be reduced.
When the insertion end portion has a circular cross section, the suction port has an elliptical cross section, and an end edge in the minor axis direction of the ellipse forms the abutment region, and an end edge in the major axis direction forms the non-abutment region.
According to this configuration, it is possible to easily form the abutment region and the non-abutment region simply by forming the suction port with an elliptical cross section. As a result, the time and cost required for processing can be reduced.

Advantageous Effects of Invention

According to the present invention, it is possible to improve the efficiency of the compressor, while reliably fixing the suction pipe to the suction port.

Brief Description of Drawings

FIG. 1 is a longitudinal sectional view illustrating a configuration of a compressor according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of the compressor according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2.
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2.
FIG. 5 is an enlarged view of a main part of a compressor according to a modified example that does not form part of the invention.
FIG. 6 is a cross-sectional view taken along line C-C of FIG. 5.
FIG. 7 is a cross-sectional view taken along line D-D of FIG. 5.
FIG. 8 is an enlarged view of a main part of a compressor according to a second embodiment of the present invention.
FIG. 9 is a cross-sectional view taken along line E-E of FIG. 8.

Description of Embodiments

[First embodiment]

A first embodiment of the present invention will be described with reference to FIGS. 1 to 4. It should be noted that the expression "same" in the following description refers to substantially the same, and for example, design tolerance and manufacturing error are acceptable.
As illustrated in FIG. 1, a compressor system 100 according to the present embodiment includes an accumulator 24, suction pipes 26A and 26B (a first suction pipe 26A and a second suction pipe 26B), and a compressor 10. The compressor 10 according to the present embodiment is a two-cylinder type rotary compressor. The compressor 10 includes a motor 18 driven by an external power source, a compression mechanism unit 10A that compresses a refrigerant (fluid) by being driven with the motor 18 such that it generates a high-pressure refrigerant, and a housing 11 which covers the motor 18 and the compression mechanism unit 10A.
The compression mechanism unit 10A includes a crankshaft 16 rotated by the motor 18, piston rotors 13A and 13B (a first piston rotor 13A and a second piston rotor 13B) which rotate eccentrically with rotation of the crankshaft 16, and cylinders 12A and 12B (a first cylinder 12A and a second cylinder 12B) in which compression chambers for accommodating the piston rotors 13A and 13B are formed inside.
In the compression mechanism unit 10A, the disk-shaped first cylinder 12A and the disk-shaped second cylinder 12B are provided inside the cylindrical housing 11 in two stages in a vertical direction. The housing 11 surrounds the first cylinder 12A and the second cylinder 12B, thereby forming a discharge space V through which the compressed refrigerant is discharged. A cylindrical first piston rotor 13A and a second piston rotor 13B having an outer shape smaller than the inner side of its inner wall surface are disposed inside the first cylinder 12A and the second cylinder 12B, respectively. The first piston rotor 13A and the second piston rotor 13B are inserted and fixed to eccentric shaft portions 14A and 14B of the rotation axis along the center axial line of the housing 11, respectively.
The first piston rotor 13A of the cylinder of the upper stage side, and the second piston rotor 13B of the lower stage side are provided so that their phases differ from each other by 180°. Further, a disc-shaped partition plate 15 is provided between the upper first cylinder 12A and the lower second cylinder 12B. The space R in the first cylinder 12A on the upper stage side and the space R in the second cylinder 12B on the lower stage side are divided into the compression chamber R1 and the lower stage compression chamber R2 by the partition plate 15 and do not communicate with each other.
The crankshaft 16 is supported to be rotatable around an axial line O by an upper bearing portion 17A fixed to the first cylinder 12A and a lower bearing portion 17B fixed to the second cylinder 12B. The crankshaft 16 has eccentric shaft portions 14A and 14B that are offset in a direction orthogonal to the axial line O which is a center line of the crankshaft 16. As the eccentric shaft portions 14A and 14B turn about the central axial line of the crankshaft 16, the upper first piston rotors 13A and the lower second piston rotors 13B follow the turning and eccentrically rotate inside the first cylinder 12A and the second cylinder 12B.
The crankshaft 16 protrudes upward from the upper bearing portion 17A (that is, a direction in which the motor 18 is located as viewed from the compression mechanism unit 10A). A rotor 19A of a motor 18 for rotationally driving the crankshaft 16 is integrally provided in a portion protruding upward from the upper bearing portion 17A of the crankshaft 16. A stator 19B is provided by being fixed to the inner peripheral surface of the housing 11 to face the outer peripheral portion of the rotor 19A.
In the compressor 10, an accumulator 24 for performing gas-liquid separation of refrigerant prior to supplying to the compressor 10 is fixed to the housing 11 via a stay 25. The refrigerant before compression is stored in the accumulator 24. A first suction pipe 26A and a second suction pipe 26B for sucking the refrigerant in the accumulator 24 into the compressor 10 are provided between the accumulator 24 and the compressor 10. One ends of the first suction pipe 26A and the second suction pipe 26B are connected to the lower portion of the accumulator 24. The other ends of the first suction pipe 26A and the second suction pipe 26B are connected to the suction ports 23A and 23B (the first suction port 23A and the second suction port 23B) formed in each of the first cylinder 12A and the second cylinder 12B through the openings 22A and 22B (a first opening 22A and a second opening 22B) formed in the housing 11.
Next, detailed configurations of the first suction port 23A and the second suction port 23B, and the first suction pipe 26A and the second suction pipe 26B will be described with reference to FIGS. 2 to 4. Since the connection mode of the first suction port 23A and the first suction pipe 26A is the same as the connection mode of the second suction port 23B and the second suction pipe 26B, in the following description, only the first suction port 23A and the first suction pipe 26A will be representatively described.
As illustrated in FIG. 2, the first suction port 23A is recessed radially inward from a surface facing radially outwards centered on the axial line O of the first cylinder 12A. The first suction port 23A has a circular cross section when viewed from the radial direction (see FIG. 3 or FIG. 4). A surface facing the radially outer side inside the first suction port 23A serves as a suction port bottom surface 31. The inner peripheral surface of the first suction port 23A is the suction port inner peripheral surface 32. A space surrounded by the suction port bottom surface 31 and the suction port inner peripheral surface 32 is an insertion space Vs into which the first suction pipe 26A is inserted. A communicating hole H1 through which the insertion space Vs and the aforementioned compression chamber R1 communicate with each other is formed on the suction port bottom surface 31.
The first suction pipe 26A has a suction pipe main body 41, an insertion end portion 42, and a connecting portion 43. An insertion end portion 42 that forms an end portion on one side of the first suction pipe 26A is inserted into the insertion space Vs in the first suction port 23A. As illustrated in FIG. 3, the insertion end portion 42 has an elliptical cross section when viewed from the radial direction. More specifically, the insertion end portion 42 is inserted into the first suction port 23A to make a minor axis direction of the ellipse coincident with the direction of the axial line O (a vertical direction) extending the axial line O. A distal end surface of the insertion end portion 42 (that is, an end surface of the insertion end portion 42 facing the communicating hole H1) is a suction pipe end surface 42A. The suction pipe end surface 42A abuts against the above-described suction port bottom surface 31. An inner diameter (a length in a minor axis direction) of the insertion end portion 42 is larger than a diameter of the communicating hole H1.
The insertion end portion 42 is connected to the suction pipe main body 41 via the connecting portion 43 on a side opposite to the suction pipe end surface 42A. More specifically, the connecting portion 43 has a first connecting portion 43A, an extending portion 43B, and a second connecting portion 43C. The first connecting portion 43A is connected to the other side of the insertion end portion 42 (the suction pipe main body 41 side with respect to the insertion end portion 42). The extending portion 43B is connected to the other side of the first connecting portion 43A. The extending portion 43B has a circular cross section when viewed from the radial direction. A diameter of the extending portion 43B is substantially equal to a length of the first connecting portion 43A in a major axis direction. That is, the cross-sectional shape of the first connecting portion 43A gradually changes from an elliptical shape to a circular shape, from the insertion end portion 42 side to the suction pipe main body 41 side. More specifically, in the first connecting portion 43A, the length of the elliptical shape in the minor axis direction gradually increases from the insertion end portion 42 side toward the suction pipe main body 41 side to coincide with the dimension of the elliptical shape in the major axis direction. As illustrated in FIG. 4, the outer peripheral surface (an extending portion outer peripheral surface 43b) of the extending portion 43B abuts the suction port inner peripheral surface 32 over the entire circumference. The second connecting portion 43C is connected to the other side of the extending portion 43B. The second connecting portion 43C connects the extending portion 43B and the suction pipe main body 41. Here, the diameter dimension of the suction pipe main body 41 is larger than the diameter dimension of the extending portion 43B. That is, the second connecting portion 43C gradually expands in diameter from the insertion end portion 42 side to the suction pipe main body 41 side. The suction pipe main body 41 extends toward the accumulator 24 through a first opening 22A formed in the housing 11. Further, as illustrated in FIG. 2, an annular guide tube P fixed in a state of being inserted through the first opening 22A is attached to the first opening 22A to cover an end edge of the first opening 22A.
As illustrated in FIG. 3, an abutment region A1 and a non-abutment region A2 are formed between the outer peripheral surface (the insertion end portion outer peripheral surface 42B) of the insertion end portion 42 and the suction port inner peripheral surface 32. In the abutment region A1, the insertion end portion outer peripheral surface 42B and the suction port inner peripheral surface 32 abut each other. More specifically, the insertion end portion outer peripheral surface 42B forming the end portions on both sides in the major axis direction of the insertion end portion 42 having an elliptical cross section abuts the suction port inner peripheral surface 32, thereby forming an abutment region A1. That is, the abutment region A1 of the present embodiment is formed on both sides in the horizontal direction orthogonal to the direction of the axial line O with respect to the insertion end portion 42. In the abutment region A1, the insertion end portion 42 abuts against the suction port inner peripheral surface 32 in a state of being slightly elastically deformed inward in the major axis direction.
In the non-abutment region A2, a space is formed between the insertion end portion outer peripheral surface 42B and the suction port inner peripheral surface 32. This space is a part of the insertion space Vs and is referred to as a heat insulation space Vh. That is, since the insertion end portion outer peripheral surface 42B and the suction port inner peripheral surface 32 forming the end portions on both sides of the insertion end portion 42 having an elliptical cross section in the short axis direction are separated from each other, the non-abutment region A2 is formed. More specifically, the heat insulation space Vh is a space defined by the suction port bottom surface 31, the suction port inner peripheral surface 32, the outer peripheral surface (a first connecting portion outer peripheral surface 43a) of the first connecting portion 43A, and the insertion end portion outer peripheral surface 42B. As described above, in the present embodiment, since the insertion end portion 42 has an elliptical cross section with the minor axis as the direction of the axial line O, the heat insulation space Vh is formed on both sides of the insertion end portion 42 in the direction of the axial line O across the abutment region A1.
Next, the operation of the compressor system 100 according to the present embodiment will be described. In the operation of the compressor system 100, the motor 18 is driven first by power supply from the outside. The compressor 10 takes the refrigerant into the accumulator 24 from the suction port 24a of the accumulator 24. Specifically, the refrigerant is separated into a liquid phase component and a gas phase component in the accumulator 24. The separated gas phase components are supplied from the first suction pipe 26A and the second suction pipe 26B to the compression chambers R1 and R2 as the internal spaces of the first cylinder 12A and the second cylinder 12B via the first suction port 23A and the second suction port 23B. As the first piston rotor 13A and the second piston rotor 13B rotate eccentrically, the volumes of the compression chambers R1 and R2 gradually decrease and the refrigerant is compressed. The refrigerant passes through the vicinity of the motor 18 in the housing 11 and the periphery of the first suction port 23A and the second suction port 23B, and then is discharged to a piping 27 constituting the refrigeration cycle via the discharge port provided in the upper portion.
Here, the refrigerant discharged from the compression chambers R1 and R2 is heated to a high temperature with the compression in addition to having a high pressure. The high-temperature and high-pressure refrigerant passes around the first suction port 23A and the second suction port 23B when flowing through the housing 11 as described above. On the other hand, the refrigerant before compression (that is, low-temperature and low-pressure refrigerant compared with the compressed refrigerant) flows through the inside of the first suction port 23A and the second suction port 23B, and the inside of the first suction pipe 26A and the second suction pipe 26B inserted therein. Therefore, there is a possibility that heat will be transferred from the high-temperature and high-pressure refrigerant flowing in the housing 11 toward the low-temperature and low-pressure refrigerant flowing inside the first suction pipe 26A and the second suction pipe 26B. When such a heat transfer occurs, the refrigerant before compression is heated, and the compression efficiency which should inherently be obtained by the compression mechanism unit 10A may be impaired.
However, in the compressor system 100 according to the present embodiment, as described above, the abutment region A1 and the non-abutment region A2 are formed between the insertion end portion 42 of the first suction pipe 26A and the first suction port 23A. Specifically, in the non-abutment region A2, a heat insulation space Vh is formed between the insertion end portion outer peripheral surface 42B and the suction port inner peripheral surface 32. The inside of the housing 11 and the inside of the first suction pipe 26A are separated from each other by the heat insulation space Vh. Therefore, it can be made difficult for the heat of the high-temperature and high-pressure refrigerant flowing through the housing 11 to be transmitted to the refrigerant before compression flowing through the first suction pipe 26A. As a result, it is possible to minimize a temperature rise of the refrigerant before compression.
On the other hand, in the abutment region A1, the insertion end portion outer peripheral surface 42B abuts the suction port inner peripheral surface 32. Accordingly, even when an external force is applied to the first suction port 23A or the insertion end portion 42 due to the vibration of the first suction pipe 26A caused by pulsation or the like of the inflowing refrigerant, it is possible to sufficiently resist the external force. Therefore, the insertion end portion 42 can be firmly fixed to the first suction port 23A. Thus, it is possible to improve the efficiency of the compressor 10, while the first suction pipe 26A is reliably fixed to the first suction port 23A.
Here, on both sides in the direction of the axial line O of the first suction pipe 26A, which is liable to come into contact with the high-temperature and high-pressure refrigerant flowing through the housing 11, the temperature easily rises due to the high-temperature and high-pressure refrigerant in the housing 11. However, according to the above configuration, the non-abutment region A2 is formed in a portion in which the temperature easily rises. Therefore, the heat of the high-temperature and high-pressure refrigerant in the housing 11 can be made hard to be transmitted by the refrigerant in the first suction pipe 26A.
Further, according to the above configuration, since the insertion end portion outer peripheral surface 42B abuts the suction port inner peripheral surface 32 in the elastically deformed state, the insertion end portion outer peripheral surface 42B and the suction port inner peripheral surface 32 strongly come into contact each other by the restoring force due to the elastic deformation. Therefore, the insertion end portion 42 can be more firmly fixed to the first suction port 23A.
In addition, according to the above configuration, the extending portion 43B connected to the insertion end portion 42 abuts the suction port inner peripheral surface 32 over the entire circumference. Further, the end surface (the suction pipe end surface 42A) of the insertion end portion 42 abuts against the suction port bottom surface 31. Therefore, in the non-abutment region A2, a space independent from the outside is formed by the insertion end portion outer peripheral surface 42B, the suction port bottom surface 31, the suction port inner peripheral surface 32, and the outer peripheral surface of the first connecting portion 43A (the first connecting portion outer peripheral surface 43a), and the space can be the above-described heat insulation space Vh. That is, the heat insulation space Vh can be a space thermally independent from the outside. As a result, it is possible to more effectively suppress the heat transfer between the inside of the housing 11 and the inside of the first suction pipe 26A.
In addition, according to the above configuration, the first suction port 23A has a circular cross section, and the insertion end portion 42 has an elliptical cross section. That is, the abutment region A1 and the non-abutment region A2 can be easily formed only by setting the insertion end portion 42 to have an elliptical cross section. As a result, the time and cost required for processing can be reduced.
In the above embodiment, since the connection mode between the first suction port 23A and the first suction pipe 26A, and the connection mode between the second suction port 23B and the second suction pipe 26B are identical to each other, the first suction port 23A and the first suction pipe 26A has been described, and the function and effect thereof has been described with reference to only these configurations. However, the second suction port 23B and the second suction pipe 26B can also obtain the same configuration and the same operation and effect on the basis thereof.
The first embodiment of the present invention has been described above. It is to be noted that various changes and modifications can be made to the above-described structure without departing from the gist of the present invention.

[Modified example that does not form part of the invention]

A modified example that does not form part of the present invention, but represent background art that is useful for understanding the invention, will be described with reference to FIGS. 5 to 7. The same configurations as those of the first embodiment are denoted by the same reference numerals, and the detailed explanation thereof will not be provided. Further, as in the aforementioned first embodiment, since the connection mode between the first suction port 23A and the first suction pipe 26A and the connection mode between the second suction port 23B and the second suction pipe 26B are identical to each other, the configuration of the first suction port 23A and the first suction pipe 26A will be representatively described.
As illustrated in FIGS. 5 and 6, in this modified example, the cross sectional shape of the insertion end portion 242 of the first suction pipe 26A is different from that of the first embodiment. Specifically, the insertion end portion 242 has a circular cross section smaller than the suction pipe main body 41 and has a pair of protruding portions 242P protruding from the insertion end portion outer peripheral surface 242B toward the suction port inner peripheral surface 32. The pair of protruding portions 242P extends in a direction (a horizontal direction) orthogonal to the axial line O from the insertion end portion outer peripheral surface 242B.
Since the distal end surface Pa (that is, the end surface facing the suction port inner peripheral surface 32) of the protruding portion 242P is curved to conform to the curved shape of the suction port inner peripheral surface 32, the distal end surface Pa abuts against the suction port inner peripheral surface 32 without a gap. That is, between the suction port inner peripheral surface 32 and the insertion end portion outer peripheral surface 242B, the protruding portion 242P forms the abutment region A1. Further, as illustrated in FIG. 5, the protruding portion 242P extends from the suction pipe end surface 242A to the boundary position between the connecting portion 243 and the insertion end portion 242 in the extending direction of the insertion end portion 242. The connecting portion 243 is integrally connected to a suction pipe main body 41 having a circular cross section. More specifically, similarly to the first embodiment, the connecting portion 243 has a first connecting portion 243A, an extending portion 243B, and a second connecting portion 243C. The first connecting portion 243A is connected to the other side of the insertion end portion 242. The extending portion 243B is connected to the other side of the first connecting portion 243A. The extending portion 243B has a circular cross section when viewed from the radial direction. The outer peripheral surface (the extending portion outer peripheral surface 243b) of the extending portion 243B abuts the suction port inner peripheral surface 32 over the entire circumference. The second connecting portion 243C connects the extending portion 243B and the suction pipe main body 41.
On the other hand, between the suction port inner peripheral surface 32 and the insertion end portion outer peripheral surface 242B, a region in which the protruding portion 242P is not formed is the non-abutment region A2. In the non-abutment region A2, the protruding portion 242P, the insertion end portion outer peripheral surface 242B, the suction port inner peripheral surface 32, and the first connecting portion outer peripheral surface 243a form the above-described heat insulation space Vh.
With the configuration according to the present modification, it is also possible to obtain the same operational effects as those described in the first embodiment.

[Second embodiment]

Subsequently, a second embodiment of the present invention will be described with reference to FIGS. 8 and 9. The same components as those of the first embodiment are denoted by the same reference numerals, and a detailed description thereof will not be provided. Further, as in the first embodiment, since the connection mode between the first suction port 23A and the first suction pipe 26A, and the connection mode between the second suction port 23B and the second suction pipe 26B are identical to each other, the configuration of the first suction port 23A and the first suction pipe 26A will be representatively described.
As illustrated in FIG. 8, in the present embodiment, the insertion end portion 342 is connected to the suction pipe main body 41 via the connecting portion 343. The insertion end portion 342 has a circular cross section smaller than the suction pipe main body 41.
On the other hand, the suction port 323A has an elliptical cross section and is recessed. The inner peripheral surface (the suction port inner peripheral surface 332) forming the end portion in the minor axis direction of the elliptical shape abuts the insertion end portion outer peripheral surface 342B to form the abutment region A1. Further, the suction port inner peripheral surface 332 forming the end portion in the major axis direction forms the non-abutment region A2 by forming the heat insulation space Vh between the suction port inner peripheral surface 332 and the insertion end portion outer peripheral surface 342B.
With this configuration, it is also possible to obtain the same operational effects as those described in the first embodiment. In addition, in the above configuration, the insertion end portion 342 has a circular cross section, and the suction port 323A has an elliptical cross section. That is, the abutment region A1 and the non-abutment region A2 can be easily formed only by forming the suction port 323A into an elliptical cross section. As a result, the time and cost required for processing can be reduced.

Industrial Applicability

Reference Signs List

100 Compressor system
10 Compressor
10A Compression mechanism unit
11 Housing
12A, 12B Cylinder
13A, 13B Piston rotor
14A, 14B Eccentric shaft portion
16 Crankshaft
17A Upper bearing portion
17B Lower bearing portion
18 Motor
19A Rotor
19B Stator
22A, 22B Opening
23A, 23B, 323A Suction port
24 Accumulator
24a Suction port
25 Stay
26A, 26B Suction pipe
27 Piping
31 Suction port bottom surface
32 Suction port inner peripheral surface
41 Suction pipe main body
41A Main body outer peripheral surface
42, 242, 342 Insertion end portion
42A Suction pipe end surface
42B, 242B, 342B Insertion end portion outer peripheral surface
43 Connecting portion
43A, 243A First connecting portion
43a, 243a First connecting portion outer peripheral surface
43B, 243B Extending portion
43b, 243b Extending portion outer peripheral surface
43C, 243C Second connecting portion
242P Protruding portion
H1 Communicating hole
A1 Abutment region
A2 Non-abutment region
O Axial line
P Guide pipe
V Discharge space
Vs Insertion space

Claims

A compressor system (100) comprising:
a crankshaft (16) that is configured to rotate about an axial line (O);

a compression mechanism unit (10A) which includes a piston rotor (13A, 13B) that is configured to rotate eccentrically with rotation of the crankshaft (16), and a cylinder (12A, 12B) having a compression chamber (R1, R2) accommodating the piston rotor formed inside;

a housing (11) which accommodates the crankshaft (16) and the compression mechanism unit (10A) and which is configured to allow a high-pressure refrigerant generated by the compression mechanism unit (10A) to flow therethrough;

an accumulator (24) in which the refrigerant is stored; and

a suction pipe (26A, 26B) in which an insertion end portion (42, 242, 342) to be inserted into a suction port (23A, 23B, 323A) formed in the cylinder is formed at an end portion and which is configured to supply the refrigerant before compression from the accumulator (24) to the compression chamber,

wherein, between an outer peripheral surface (42B) of the insertion end portion and an inner peripheral surface (32) of the suction port, an abutment region (A1) in which the outer peripheral surface of the insertion end portion and the inner peripheral surface of the suction port abut each other, and a non-abutment region (A2) forming a space between the outer peripheral surface (42B) of the insertion end portion and the inner peripheral surface (32) of the suction port are formed, the compressor system being characterized in that,

the suction port (23A, 23B, 323A) or the insertion end portion (42, 242, 342) has a circular cross section, and

when the suction port (23A, 23B, 323A) has a circular cross section, the insertion end portion (42, 242, 342) has an elliptical cross section, an end edge in a major axis direction of the ellipse forming the abutment region (A1), and an end edge in a minor axis direction forming the non-abutment region (A2), and

when the insertion end portion (42, 242, 342) has a circular cross section,

the suction port (24a) has an elliptical cross section, an end edge in the minor axis direction of the ellipse forming the abutment region (A1), and an end edge in the major axis direction forming the non-abutment region (A2).
The compressor system (100) according to Claim 1, wherein the non-abutment region (A2) is formed at least on one side in an axial line direction in which the axial line extends with respect to the insertion end portion (42, 242, 342).
The compressor system (100) according to Claim 2, wherein the non-abutment region (A2) is formed on both sides in the axial line direction with respect to the insertion end portion (42, 242, 342).
The compressor system (100) according to any one of Claims 1 to 3, wherein the abutment region (A1) is formed on both sides in a horizontal direction orthogonal to the axial line direction in which the axial line extends with respect to the insertion end portion (42, 242, 342).
The compressor system (100) according to any one of Claims 1 to 4, wherein, in the abutment region (A1), the insertion end portion abuts the inner peripheral surface (32) of the suction port in an elastically deformed state.
The compressor system (100) according to any one of Claims 1 to 5, wherein the suction pipe (26A, 26B) further has:
a suction pipe main body (41) which abuts against the inner peripheral surface (32) of the suction port over the entire circumference, and

a connecting portion (43) which connects the suction pipe main body (41) and the insertion end portion (42, 242, 342), and

a suction pipe end surface (42A), which is an end surface of the insertion end portion, abuts against a suction port bottom surface (31) facing the suction pipe end surface (42A) in the suction port (23A, 23B, 323A).