Piston and compressor

Abstract

The present invention provides a piston and a compressor. The piston is used in a compressor, and a lightening space for reducing the mass of the piston is provided on the piston; the lightening space includes a first lightening area, the piston includes a compression surface for forming a compression chamber with a cylinder liner and a cylinder, and the first lightening area is arranged at intervals from the compression surface, so that when the pressure in the compression chamber is too large, part of the structure of the piston undergoes elastic deformation toward one side of the first lightening area to reduce over-compression; and / or the lightening space includes a second lightening area, the piston includes an abutting surface for abutting against the inner wall of the cylinder, and the second lightening area is provided on the abutting surface to reduce the friction between the abutting surface and the inner wall surface of the cylinder. The technical solution of the present invention solves the problem of high noise in compressors in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a piston and a compressor. Background Art

[0002] The rotary piston compressor is a new type of positive displacement compressor. Figures 1 to 4 As shown, the rotary piston compressor generally comprises a cylinder liner 1', a cylinder 2', a piston 3', a rotating shaft 4', an upper flange 6', a lower flange 7', an upper limit plate 8' and a lower limit plate 9', wherein the cylinder 2' is installed in the cylinder liner 1', the piston 3' is installed in the cylinder 2', the rotating shaft 4' is installed in the mounting hole of the piston 3', and the rotating axes of the cylinder 2' and the rotating shaft 4' are eccentrically arranged. Figure 2 and Figure 5 It can be seen that by driving the rotating shaft 4' to rotate, the rotating shaft 4' drives the cylinder 2' to rotate through the piston 3', so that the piston 3' can reciprocate relative to the cylinder 2' and the rotating shaft 4' at the same time, and the compression chamber 5' can be periodically changed; at the same time, the cylinder 2' makes a circular motion relative to the cylinder liner 1', so that the compression chamber 5' is connected with the intake channel or the exhaust channel provided on the cylinder liner 1', thereby realizing the intake process, compression process and exhaust process of the compressor.

[0003] from Figure 5 It can be seen from the schematic diagram of the motion trajectory of the center of mass of the piston 3' that the motion trajectory of the center of mass of the piston 3' is a circle with the line connecting the center O1 of the rotating shaft 4' and the center O2 of the cylinder 2' as the diameter. The centrifugal force generated by the circular motion of the piston 3' will cause the vibration of the compressor to intensify. The centrifugal force is proportional to the mass of the piston 3'. The greater the mass, the greater the centrifugal force and the greater the vibration, resulting in the compressor having greater noise and poor reliability. Summary of the invention

[0004] The main purpose of the present invention is to provide a piston and a compressor to solve the problem of high noise in the compressor in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a piston is provided, which is used in a compressor, and a lightening space is provided on the piston for reducing the mass of the piston; wherein the lightening space includes a first lightening area, the piston includes a compression surface for forming a compression chamber with a cylinder liner and a cylinder, and the first lightening area is arranged at an interval from the compression surface, so that when the pressure in the compression chamber is too large, part of the structure of the piston undergoes elastic deformation toward one side of the first lightening area to reduce over-compression; and / or the lightening space includes a second lightening area, the piston includes an abutting surface for abutting against the inner wall of the cylinder, and the second lightening area is opened on the abutting surface to reduce the friction between the abutting surface and the inner wall surface of the cylinder.

[0006] Further, the cross-section of the first relief area perpendicular to the rotation axis of the piston is in an arc shape; or the cross-section of the first relief area perpendicular to the rotation axis of the piston is in a polygonal shape; or the cross-section of the first relief area perpendicular to the rotation axis of the piston is in a circular shape.

[0007] Furthermore, the compression surface is arranged in an arc shape, the cross section of the first relief area perpendicular to the rotation axis of the piston is arranged in an arc shape, and two inner wall surfaces of the first relief area arranged opposite to the compression surface are arranged concentrically with the compression surface.

[0008] Further, a minimum distance S between an inner wall surface of the first relief area close to the compression surface and the compression surface is greater than or equal to 2 mm.

[0009] Further, a minimum distance H between an inner wall surface of the first relief area close to the abutting surface and the abutting surface is greater than or equal to 3 mm.

[0010] Furthermore, an installation space for installing a rotating shaft is provided on the piston, and the first lightening area is arranged at an interval from the installation space, and the first lightening area is located between the compression surface and the installation space; the minimum distance L between the inner wall surface of the first lightening area close to the installation space and the inner wall surface of the installation space close to the lightening space is greater than or equal to 3 mm.

[0011] Further, along the direction in which the rotation axis of the piston extends, the piston includes two end surfaces that are opposite to each other, and the first lightened area runs through the two end surfaces.

[0012] Further, the compression surface is symmetrically arranged along the reference plane, and the projection of the second lightening area on the reference plane is arranged in a square shape; or the compression surface is symmetrically arranged along the reference plane, and the projection of the second lightening area on the reference plane is arranged in a strip shape, and the extension direction of the second lightening area arranged in a strip shape is the same as the extension direction of the rotation axis of the piston.

[0013] Further, the second relief area includes a groove bottom wall arranged opposite to the abutment surface, the abutment surface is arranged in an arc shape, and the groove bottom wall includes a first groove bottom section arranged in an arc shape and concentrically with the abutment surface; wherein the second relief area includes two first groove side walls arranged opposite to each other along the direction extending from the rotation axis of the piston, the two first groove side walls are both arranged in an arc shape and are tangent to the first groove bottom section; or the groove bottom wall also includes two second groove bottom sections respectively connected to the two ends of the first groove bottom section along the direction extending from the rotation axis of the piston, and the two second groove bottom sections are both planes parallel to the rotation axis of the piston.

[0014] Further, the piston includes two compression surfaces arranged opposite to each other along the first direction and two abutment surfaces arranged opposite to each other along the second direction; the second relief area includes a groove bottom wall arranged opposite to the abutment surface along the second direction, and the second relief area also includes two second groove side walls respectively connected to the two ends of the groove bottom wall along the first direction, and the second groove side walls are planes extending along the second direction.

[0015] Further, a minimum distance M between the second groove side wall and the compression surface adjacent thereto is ≥ 2 mm.

[0016] Furthermore, an installation space for installing a rotating shaft is provided on the piston, and the installation space is spaced apart from the second lightening area; the minimum distance D between the groove bottom wall of the second lightening area and the inner wall surface of the installation space close to the groove bottom wall is ≥2mm.

[0017] Furthermore, the piston is provided with an installation space for installing a rotating shaft, and the installation space is arranged at intervals from the lightening space; along the direction in which the rotation axis of the piston extends, the piston includes two end faces arranged opposite to each other, and the installation space is a mounting hole that passes through the two end faces; the minimum distance N≥2mm between the first edge of the second lightening area perpendicular to the rotation axis of the piston and the second edge of the mounting hole perpendicular to the rotation axis of the piston.

[0018] Furthermore, an installation space for installing a rotating shaft is provided on the piston, two compression surfaces are symmetrically arranged on both sides of the installation space along a first direction, and two first relief areas are symmetrically arranged on both sides of the installation space along the first direction; two abutment surfaces are symmetrically arranged on both sides of the installation space along a second direction, and two second relief areas are symmetrically arranged on both sides of the installation space along the second direction.

[0019] According to another aspect of the present invention, a compressor is provided, comprising: a cylinder liner; a cylinder, which is pivotally arranged in the cylinder liner; a piston, which is installed in the cylinder and slidably connected to the cylinder, and the piston is the above-mentioned piston; a rotating shaft, which is slidably connected to the piston, and the rotation axis of the rotating shaft is eccentrically arranged parallel to the rotation axis of the cylinder; wherein the compression surface of the piston and the inner wall surface of the cylinder and the inner wall surface of the cylinder liner form a compression chamber, and when the piston is driven to rotate by the rotating shaft, the piston slides relative to the rotating shaft and drives the cylinder to rotate relative to the cylinder liner, and the piston slides relative to the cylinder and changes the size of the compression chamber.

[0020] By applying the technical solution of the present invention, a lightening space for reducing the mass of the piston is provided on the piston, thereby reducing the mass of the piston. Since the magnitude of the centrifugal force of the piston center of mass is proportional to the mass of the piston, that is, the smaller the mass of the piston, the smaller the centrifugal force, the vibration of the compressor can be effectively reduced, the noise of the compressor can be reduced, the reliability of the compressor can be improved, and the performance of the compressor can be improved. In addition, by optimizing the setting position of the lightening space on the piston, the present application achieves the technical effect of reducing the over-compression loss of the compressor and / or reducing the friction power consumption of the compressor, thereby further improving the performance of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A schematic diagram of the main cross-sectional structure of a compressor in the prior art is shown;

[0023] Figure 2 Shows Figure 1 A schematic diagram of a top view cross-sectional structure of a compressor;

[0024] Figure 3 Shows Figure 1 Schematic diagram of the disassembled structure of the compressor;

[0025] Figure 4 Shows Figure 3 A schematic diagram of the three-dimensional structure of the piston in FIG.

[0026] Figure 5 A schematic diagram showing the motion trajectory of the center of mass of the piston;

[0027] Figure 6 The pressure variation curve of the compressor during the suction and exhaust process measured by the test during use is shown;

[0028] Figure 7 It shows the pressure change curves during the suction and exhaust process with or without overcompression obtained by theoretical calculation during the use of the compressor;

[0029] Figure 8 A schematic diagram of the three-dimensional structure of a piston according to the first embodiment of the present invention is shown;

[0030] Fig. 9 Shows Figure 8 A schematic diagram of the main structure of the piston in FIG.

[0031] Fig.10 Shows Fig. 9 Schematic diagram of the cross-sectional structure at AA in the middle;

[0032] Fig.11 Shows Fig. 9 Schematic diagram of the cross-sectional structure at the middle BB;

[0033] Fig.12 A schematic diagram of the three-dimensional structure of a piston according to the second embodiment of the present invention is shown;

[0034] Fig.13 Shows Fig.12 A schematic diagram of the main structure of the piston in FIG.

[0035] Fig.14 Shows Fig.13 A schematic diagram of a top cross-sectional structure of a piston in FIG.

[0036] Fig.15 A schematic diagram of the three-dimensional structure of a piston according to the third embodiment of the present invention is shown;

[0037] Fig.16 Shows Fig.15 A schematic diagram of a top cross-sectional structure of a piston in FIG.

[0038] Fig.17 A schematic diagram of the three-dimensional structure of a piston according to a fourth embodiment of the present invention is shown;

[0039] Fig.18 Shows Fig.17 A schematic diagram of a top cross-sectional structure of a piston in FIG.

[0040] Fig.19 A schematic diagram of the three-dimensional structure of a piston according to a fifth embodiment of the present invention is shown;

[0041] Fig. 20 Shows Fig.19 A schematic diagram of the main structure of the piston in FIG.

[0042] Fig.21 Shows Fig. 20 Schematic diagram of the cross-sectional structure at CC in the middle;

[0043] Fig. 22 A schematic diagram of the three-dimensional structure of a piston according to a sixth embodiment of the present invention is shown;

[0044] Fig.23 Shows Fig. 22 A schematic diagram of a top cross-sectional structure of a piston in FIG.

[0045] Fig.24 Shows Fig.23 Schematic diagram of the cross-sectional structure at DD in the middle;

[0046] Fig.25A schematic diagram of the assembly structure of a compressor according to an optional embodiment of the present invention is shown.

[0047] The above drawings include the following reference numerals:

[0048] 1. Cylinder liner; 2. Cylinder; 3. Piston; 31. Compression surface; 32. Abutment surface; 10. Lightening space; 11. First lightening area; 12. Second lightening area; 101. Groove bottom wall; 111. First groove bottom section; 112. Second groove bottom section; 102. First groove side wall; 103. Second groove side wall; 20. Installation space; 4. Rotating shaft; 5. Compression chamber. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In order to solve the problem of relatively high noise in the compressor in the prior art, the present invention provides a piston and a compressor.

[0051] Embodiment 1

[0052] like Figures 8 to 11 As shown, the piston is used in a compressor, and a lightening space 10 for reducing the mass of the piston is provided on the piston; wherein the lightening space 10 includes a first lightening area 11, and the piston includes a compression surface 31 for forming a compression chamber 5 with the cylinder liner 1 and the cylinder 2, and the first lightening area 11 is arranged at an interval from the compression surface 31, so that when the pressure in the compression chamber 5 is too large, part of the structure of the piston undergoes elastic deformation toward one side of the first lightening area 11 to reduce over-compression; at the same time, the lightening space 10 includes a second lightening area 12, and the piston includes an abutting surface 32 for abutting against the inner wall of the cylinder 2, and the second lightening area 12 is opened on the abutting surface 32 to reduce the friction between the abutting surface 32 and the inner wall surface of the cylinder 2.

[0053] In this embodiment, a lightening space 10 for reducing the mass of the piston is provided on the piston, thereby reducing the mass of the piston. Since the magnitude of the centrifugal force of the piston center of mass is proportional to the mass of the piston, that is, the smaller the mass of the piston, the smaller the centrifugal force, thereby effectively reducing the vibration of the compressor, reducing the noise of the compressor, improving the reliability of the compressor, and further improving the performance of the compressor. In addition, the present application also optimizes the setting position of the lightening space 10 on the piston, that is, the first lightening area 11 is arranged at intervals with the compression surface 31 used to enclose the compression chamber 5 with the cylinder sleeve 1 and the cylinder 2, and the setting of the first lightening area 11 achieves the technical effect of reducing the over-compression loss of the compressor; the second lightening area 12 is opened on the abutting surface 32 used to abut against the inner wall of the cylinder 2, and the setting of the second lightening area 12 achieves the technical effect of reducing the friction power consumption of the compressor, thereby further improving the performance of the compressor.

[0054] Since the mass of a piston is related to its density and volume, the present application reduces the mass of the piston by reducing its volume, thereby effectively reducing the vibration of the compressor, reducing the operating noise of the compressor, and improving the reliability of the compressor.

[0055] like Figures 1 to 4 As shown, in the conventional rotary piston compressor, at the end of the exhaust process, the gap between the compression surface 31' of the piston 3' and the inner wall of the cylinder liner 1' gradually decreases. The smaller the gap, the greater the exhaust resistance. A narrow exhaust passage is formed between the compression surface 31' and the cylinder liner 1', which easily causes a large over-compression loss. Figure 6 The pressure change curve of the compressor during the use of the compressor is measured by the test during the suction and exhaust process. Figure 7 From the pressure change curve of the suction and exhaust process with and without over-compression obtained by theoretical calculation during the use of the compressor shown, it can be seen that the rotary piston compressor has a large over-compression loss at the end stage of the exhaust process, which increases the power consumption of the compressor and seriously affects the performance of the compressor.

[0056] From the analysis of the piston force and the change of the refrigerant flow channel at the exhaust end, it can be seen that when the refrigerant is severely over-compressed, the elastic deformation of the piston head is conducive to the timely discharge of the refrigerant, reducing the over-compression loss and improving the efficiency of the compressor. Therefore, in this embodiment, the first relief area 11 is set to provide a space for the compression surface 31 of the piston to undergo elastic deformation, which has the technical effect of reducing the over-compression loss.

[0057] During use of the rotary cylinder piston compressor, the rotating shaft 4 drives the cylinder 2 to rotate in the cylinder sleeve 1 through the piston 3, and the piston 3 also slides relative to the cylinder 2. The larger the contact area between the piston 3 and the cylinder 2, the greater the friction force and the greater the friction power consumption. In this embodiment, the provision of the second lightening area 12 reduces the contact area between the piston 3 and the cylinder 2, thereby achieving the technical effect of reducing friction force and reducing friction power consumption.

[0058] like Figure 8 and Fig.10 As shown, the cross section of the first lightening area 11 perpendicular to the rotation axis of the piston is in the shape of an arc, which is conducive to the elastic deformation of the compression surface 31.

[0059] like Fig.10 As shown, the compression surface 31 is arranged in an arc shape, the cross section of the first lightening area 11 perpendicular to the rotation axis of the piston is arranged in an arc shape, and the two inner wall surfaces of the first lightening area 11 arranged opposite to the compression surface 31 are arranged concentrically with the compression surface 31. In this way, it is ensured that the thickness of the piston head where the first lightening area 11 is dug out is equal everywhere, so that the compression surface 31 can be better elastically deformed, which is conducive to timely removal of the refrigerant, reducing over-compression losses, and improving the efficiency of the compressor.

[0060] Optionally, the rotation axis of the rotating shaft 4 is the rotation axis of the piston.

[0061] like Fig.10 As shown, the minimum distance S between the inner wall surface of the first lightening area 11 close to the compression surface 31 and the compression surface 31 is greater than or equal to 2 mm. In this way, the thickness of the head of the hollowed-out piston meets the use requirements and the structural strength of the piston is ensured.

[0062] like Fig.10 As shown, R1, R2 and R3 are all concentrically arranged, and R1-R2≥2mm, that is, the thickness of the piston head after hollowing out is not less than 2mm.

[0063] like Fig.10 As shown, the minimum distance H between the inner wall surface of the first lightening area 11 close to the abutting surface 32 and the abutting surface 32 is greater than or equal to 3 mm. In this way, the side thickness of the hollowed-out piston is guaranteed to meet the use requirements and the structural strength of the piston is guaranteed.

[0064] like Fig.10As shown, the piston is also provided with an installation space 20 for installing the rotating shaft 4, the first lightening area 11 is arranged at intervals from the installation space 20, and the first lightening area 11 is located between the compression surface 31 and the installation space 20; the minimum distance L between the inner wall surface of the first lightening area 11 close to the installation space 20 and the inner wall surface of the installation space 20 close to the lightening space 10 is greater than or equal to 3 mm. The test shows that when the value range of L meets the above conditions, the performance of the piston is good.

[0065] Among them, the inner wall surface of the installation space 20 close to the lightening space 10 is the shaft supporting surface. It is necessary to ensure that the minimum distance L between the inner wall surface of the lightening space 10 close to the installation space 20 and the shaft supporting surface is greater than or equal to 3mm, so that the piston meets the use requirements and ensures the strength of the piston.

[0066] like Figure 8 and Fig. 9 As shown, along the direction in which the rotation axis of the piston extends, the piston includes two end faces arranged opposite to each other, and the first lightening area 11 runs through the two end faces. In this way, the processing of the first lightening area 11 is convenient, which is conducive to the elastic deformation of the piston to reduce the over-compression loss.

[0067] like Figure 8 and Fig. 9 As shown, the compression surface 31 is symmetrically arranged along the reference plane, and the projection of the second lightening area 12 on the reference plane is arranged in a square shape. In this way, the processing technology is good, the contact area between the piston 3 and the cylinder 2 is smaller, and it is more conducive to reducing friction power consumption.

[0068] like Figure 8 and Fig.10 As shown, the piston includes two compression surfaces 31 arranged oppositely in the first direction and two abutment surfaces 32 arranged oppositely in the second direction; the second lightening area 12 includes a groove bottom wall 101 arranged oppositely to the abutment surface 32 in the second direction, and the second lightening area 12 also includes two second groove side walls 103 connected to both ends of the groove bottom wall 101 in the first direction, and the second groove side walls 103 are planes extending in the second direction. The second groove side walls 103 arranged in a plane have better processing properties.

[0069] like Fig.11 As shown, the minimum distance M between the second groove side wall 103 and the compression surface 31 adjacent thereto is ≥ 2 mm. In this way, it is ensured that after the second lightened area 12 is hollowed out, the piston still has good structural strength.

[0070] like Fig.11 As shown, the piston is also provided with an installation space 20 for installing the rotating shaft 4, and the installation space 20 is arranged at an interval with the second lightening area 12; the minimum distance D between the groove bottom wall 101 of the second lightening area 12 and the inner wall surface of the installation space 20 close to the groove bottom wall 101 is ≥ 2mm.

[0071] like Fig.10 As shown, the piston is further provided with an installation space 20 for installing the rotating shaft 4, two compression surfaces 31 are symmetrically arranged on both sides of the installation space 20 along the first direction, and two first lightening areas 11 are symmetrically arranged on both sides of the installation space 20 along the first direction; two abutment surfaces 32 are symmetrically arranged on both sides of the installation space 20 along the second direction, and two second lightening areas 12 are symmetrically arranged on both sides of the installation space 20 along the second direction. Since the piston is a symmetrical structure, including two symmetrically arranged compression surfaces 31 and two abutment surfaces 32, two symmetrical first lightening areas 11 and two second lightening areas 12 are correspondingly arranged, which is conducive to further improving the performance of the piston and the compressor.

[0072] Embodiment 2

[0073] The difference between the second embodiment and the first embodiment is that only the first lightening area 11 is provided, which is conducive to simplifying the processing technology.

[0074] Alternatively, if Figure 12 to Figure 14 As shown, the cross section of the first lightened area 11 perpendicular to the rotation axis of the piston is arranged in the shape of a circular arc.

[0075] Embodiment 3

[0076] The difference between the third embodiment and the second embodiment is that the cross-sectional shape of the first lightening area 11 is different. Specifically, the cross-sectional shape of the first lightening area 11 perpendicular to the rotation axis of the piston is polygonal. In this way, the processing technology can be further simplified.

[0077] like Fig.15 and Fig.16 As shown, the cross section of the first lightened area 11 perpendicular to the rotation axis of the piston is in the shape of a rectangle, which has the advantages of simple structure and easier processing.

[0078] Embodiment 4

[0079] The difference between the fourth embodiment and the second embodiment is that the cross-sectional shape of the first lightening area 11 is different. Specifically, Fig.17 and Fig.18 As shown, the cross section of the first lightening area 11 perpendicular to the rotation axis of the piston is in the shape of a circle. In this way, the processing technology can be further simplified, and the first lightening area 11 has the advantages of simple structure and easier processing.

[0080] Embodiment 5

[0081] The difference between the fifth embodiment and the first embodiment is that only the second lightening area 12 is provided, which is conducive to simplifying the processing technology. In addition, the shapes of the second lightening area 12 in the fifth embodiment and the first embodiment are different.

[0082] Specifically, if Figures 19 to 21 As shown, the compression surface 31 is symmetrically arranged along the reference plane, the projection of the second lightening area 12 on the reference plane is arranged in a strip shape, and the extension direction of the second lightening area 12 arranged in a strip shape is the same as the extension direction of the rotation axis of the piston. In this way, the structural strength of the piston is better, and while reducing friction power consumption, it is ensured that the piston can reliably drive the cylinder to rotate.

[0083] like Fig.21 As shown, the second lightening area 12 includes a groove bottom wall 101 arranged opposite to the abutting surface 32, the abutting surface 32 is arranged in an arc shape, and the groove bottom wall 101 includes a first groove bottom section 111 arranged in an arc shape and arranged concentrically with the abutting surface 32; wherein the second lightening area 12 includes two first groove side walls 102 arranged opposite to each other along the direction extending from the rotation axis of the piston, and the two first groove side walls 102 are both arranged in an arc shape and are both tangent to the first groove bottom section 111. In this way, the structural strength of the piston is better.

[0084] The circle with a radius R5 of the first groove bottom section 111 is the center of the circle with a radius R4 of the abutting surface 32 , which is beneficial to further ensure the structural strength of the piston.

[0085] like Fig.21 As shown, the piston is also provided with an installation space 20 for installing the rotating shaft 4, and the installation space 20 is arranged at intervals with the lightening space 10; along the direction in which the rotation axis of the piston extends, the piston includes two end faces arranged opposite to each other, and the installation space 20 is a mounting hole that penetrates the two end faces; the minimum distance N between the first edge of the second lightening area 12 perpendicular to the rotation axis of the piston and the second edge of the mounting hole perpendicular to the rotation axis of the piston is ≥ 2 mm. The test shows that when the numerical range of N meets the above conditions, the performance of the piston is good.

[0086] Embodiment 6

[0087] The difference between the sixth embodiment and the first embodiment is that only the second mitigation area 12 is provided. Figure 20 to Figure 24 As shown, the compression surface 31 is symmetrically arranged along the reference plane, and the projection of the second lightening area 12 on the reference plane is arranged in a square shape. In this way, the processing technology is better, and the contact area between the piston 3 and the cylinder 2 is smaller, and the effect of reducing friction power consumption is better.

[0088] like Fig.24As shown, the second lightening area 12 includes a groove bottom wall 101 arranged opposite to the abutting surface 32, the abutting surface 32 is arranged in an arc shape, and the groove bottom wall 101 includes a first groove bottom section 111 arranged in an arc shape and arranged concentrically with the abutting surface 32; the groove bottom wall 101 also includes two second groove bottom sections 112 respectively connected to the two ends of the first groove bottom section 111 along the direction extending along the rotation axis of the piston, and the two second groove bottom sections 112 are both planes parallel to the rotation axis of the piston. The second groove bottom section 112 arranged in a plane has better processing technology.

[0089] like Fig.24 As shown, the piston is also provided with an installation space 20 for installing the rotating shaft 4, and the installation space 20 is arranged at intervals with the lightening space 10; along the direction in which the rotation axis of the piston extends, the piston includes two end faces arranged opposite to each other, and the installation space 20 is a mounting hole that penetrates the two end faces; the minimum distance N between the first edge of the second lightening area 12 perpendicular to the rotation axis of the piston and the second edge of the mounting hole perpendicular to the rotation axis of the piston is ≥ 2 mm. The test shows that when the numerical range of N meets the above conditions, the performance of the piston is good.

[0090] The remaining thickness of the piston in the vertical direction after the second lightening area 12 is provided is the minimum distance N between the first edge and the second edge.

[0091] The present application also provides a compressor, which includes a cylinder liner 1, a cylinder 2, a piston 3 and a rotating shaft 4. The cylinder 2 is pivotally arranged in the cylinder liner 1, the piston 3 is installed in the cylinder 2 and is slidably connected to the cylinder 2, the piston 3 is the piston described above and below, the rotating shaft 4 is slidably connected to the piston 3, and the rotation axis of the rotating shaft 4 is eccentrically arranged parallel to the rotation axis of the cylinder 2; wherein the compression surface 31 of the piston 3 and the inner wall surface of the cylinder 2 and the inner wall surface of the cylinder liner 1 form a compression chamber 5, when the piston 3 is driven to rotate by the rotating shaft 4, the piston 3 slides relative to the rotating shaft 4 and drives the cylinder 2 to rotate relative to the cylinder liner 1, the piston 3 slides relative to the cylinder 2 and causes the size of the compression chamber 5 to change.

[0092] Since the piston 3 provided in the present application is light in weight, the noise of the compressor provided in the present application is relatively small. By setting the first lightening area 11 and / or the second lightening area 12 on the piston 3, the technical effect of reducing over-compression loss and / or reducing friction power consumption is achieved.

[0093] like Fig.25 As shown, the compressor in this specific embodiment includes the piston in the above-mentioned embodiment 1, and the piston includes two symmetrically arranged first relief areas 11 and two symmetrically arranged second relief areas 12, and the improvement effect is better.

[0094] The piston and compressor provided in the present application can reduce the noise and vibration of the compressor, reduce over-compression of the compressor, reduce exhaust loss, and reduce the friction power consumption of the compressor during use, which is beneficial to improving the efficiency of the compressor and improving the performance of the compressor.

[0095] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0096] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0097] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0098] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0099] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0100] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A piston used in a compressor, characterized in that: The compressor further comprises a cylinder liner (1), a cylinder (2) and a rotating shaft (4); the cylinder (2) is pivotally arranged in the cylinder liner (1); the piston (3) is mounted in the cylinder (2) and is slidably connected to the cylinder (2); the rotating shaft (4) is slidably connected to the piston (3); the rotation axis of the rotating shaft (4) is eccentrically arranged parallel to the rotation axis of the cylinder (2); wherein a compression surface (31) of the piston (3) and an inner wall surface of the cylinder (2) and an inner wall surface of the cylinder liner (1) form a compression chamber (5); when the piston (3) is driven to rotate by the rotating shaft (4), the piston (3) slides relative to the rotating shaft (4) and drives the cylinder (2) to rotate relative to the cylinder liner (1); the piston (3) slides relative to the cylinder (2) and causes the size of the compression chamber (5) to change; and a lightening space (10) for reducing the mass of the piston is provided on the piston; The lightening space (10) comprises a first lightening area (11), the piston comprises a compression surface (31) for enclosing a compression chamber (5) with the cylinder liner (1) and the cylinder (2), the first lightening area (11) and the compression surface (31) being arranged at an interval so that when the pressure in the compression chamber (5) is too high, a part of the structure of the piston is elastically deformed toward a side of the first lightening area (11) to reduce over-compression; The lightening space (10) comprises a second lightening area (12), the piston comprises an abutting surface (32) for abutting against an inner wall of the cylinder (2), and the second lightening area (12) is provided on the abutting surface (32) to reduce friction between the abutting surface (32) and the inner wall surface of the cylinder (2); The compression surface (31) is arranged in an arc shape, a cross section of the first lightening area (11) perpendicular to the rotation axis of the piston is arranged in an arc shape, and two inner wall surfaces of the first lightening area (11) arranged opposite to the compression surface (31) are arranged concentrically with the compression surface (31).

2. The piston according to claim 1, characterized in that A minimum distance S between an inner wall surface of the first relief area (11) close to the compression surface (31) and the compression surface (31) is greater than or equal to 2 mm.

3. The piston according to claim 1, characterized in that A minimum distance H between an inner wall surface of the first relief area (11) close to the abutment surface (32) and the abutment surface (32) is greater than or equal to 3 mm.

4. The piston according to claim 1, characterized in that The piston is also provided with an installation space (20) for installing the rotating shaft (4), the first lightening area (11) and the installation space (20) are arranged at a distance, and the first lightening area (11) is located between the compression surface (31) and the installation space (20); A minimum distance L between an inner wall surface of the first lightening area (11) close to the installation space (20) and an inner wall surface of the installation space (20) close to the lightening space (10) is greater than or equal to 3 mm.

5. The piston according to claim 1, characterized in that Along the direction in which the rotation axis of the piston extends, the piston comprises two end surfaces that are arranged opposite to each other, and the first lightened area (11) runs through the two end surfaces.

6. The piston according to claim 1, characterized in that The compression surface (31) is symmetrically arranged along a reference plane, and the projection of the second relief area (12) on the reference plane is arranged in a square shape; or The compression surface (31) is symmetrically arranged along a reference plane, a projection of the second lightening area (12) on the reference plane is arranged in a strip shape, and an extension direction of the second lightening area (12) arranged in a strip shape is the same as an extension direction of the rotation axis of the piston.

7. The piston according to claim 1, characterized in that The second relief area (12) comprises a groove bottom wall (101) arranged opposite to the abutment surface (32), the abutment surface (32) being arranged in an arc shape, and the groove bottom wall (101) comprises a first groove bottom section (111) arranged in an arc shape and being arranged concentrically with the abutment surface (32); Wherein, the second lightening area (12) comprises two first groove side walls (102) arranged opposite to each other along the direction extending along the rotation axis of the piston, and the two first groove side walls (102) are both arranged in an arc shape and are both tangent to the first groove bottom section (111); or The groove bottom wall (101) further comprises two second groove bottom sections (112) respectively connected to two ends of the first groove bottom section (111) in a direction extending along the rotation axis of the piston, and the two second groove bottom sections (112) are both planes parallel to the rotation axis of the piston.

8. The piston according to claim 1, characterized in that The piston comprises two compression surfaces (31) arranged opposite to each other along a first direction and two abutment surfaces (32) arranged opposite to each other along a second direction; the second relief area (12) comprises a groove bottom wall (101) arranged opposite to the abutment surface (32) along the second direction; the second relief area (12) further comprises two second groove side walls (103) respectively connected to two ends of the groove bottom wall (101) along the first direction; the second groove side walls (103) are planes extending along the second direction.

9. The piston according to claim 8, characterized in that The minimum distance M between the second groove side wall (103) and the compression surface (31) adjacent thereto is ≥2 mm.

10. The piston according to claim 1, characterized in that The piston is also provided with an installation space (20) for installing the rotating shaft (4), the installation space (20) being arranged at an interval from the second lightening area (12); and the minimum distance D between the groove bottom wall (101) of the second lightening area (12) and the inner wall surface of the installation space (20) close to the groove bottom wall (101) is ≥ 2 mm.

11. The piston according to claim 1, characterized in that The piston is also provided with an installation space (20) for installing the rotating shaft (4), and the installation space (20) is arranged at a distance from the lightening space (10); Along the direction in which the rotation axis of the piston extends, the piston comprises two end surfaces arranged opposite to each other, and the installation space (20) is a installation hole penetrating through the two end surfaces; A minimum distance N between a first edge of the second lightening area (12) perpendicular to the rotation axis of the piston and a second edge of the mounting hole perpendicular to the rotation axis of the piston is ≥2 mm.

12. The piston according to claim 1, characterized in that The piston is also provided with an installation space (20) for installing a rotating shaft (4); the two compression surfaces (31) are symmetrically arranged on both sides of the installation space (20) along a first direction; the two first relief areas (11) are symmetrically arranged on both sides of the installation space (20) along the first direction; the two abutment surfaces (32) are symmetrically arranged on both sides of the installation space (20) along a second direction; and the two second relief areas (12) are symmetrically arranged on both sides of the installation space (20) along the second direction.

13. A compressor, characterized in that: include: Cylinder liner (1); A cylinder (2), the cylinder (2) being pivotally arranged in the cylinder sleeve (1); a piston (3), the piston (3) being installed in the cylinder (2) and slidably connected to the cylinder (2), the piston (3) being the piston according to any one of claims 1 to 12; A rotating shaft (4), the rotating shaft (4) being slidably connected to the piston (3), the rotating axis of the rotating shaft (4) being eccentrically arranged parallel to the rotating axis of the cylinder (2); The compression surface (31) of the piston (3) and the inner wall surface of the cylinder (2) and the inner wall surface of the cylinder liner (1) form a compression chamber (5). When the piston (3) is driven to rotate by the rotating shaft (4), the piston (3) slides relative to the rotating shaft (4) and drives the cylinder (2) to rotate relative to the cylinder liner (1). The piston (3) slides relative to the cylinder (2) and causes the size of the compression chamber (5) to change.

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