Piston and compressor

Abstract

The present invention provides a piston and a compressor. The piston comprises: a piston body, on which a mounting space is provided; a filling structure, which is filled in the mounting space, and the density of the filling structure is less than that of the piston body, so as to reduce the mass of the piston. The technical solution of the present invention solves the problem of high noise in the compressor 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 3 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'. Figure 4 As shown, the cylinder 2' is installed in the cylinder sleeve 1', the piston 3' is installed in the cylinder 2', the shaft 4' is installed in the mounting hole of the piston 3', and the rotation axes of the cylinder 2' and the 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 greater noise and poor reliability of the compressor. 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, comprising: a piston body, on which an installation space is provided; and a filling structure, which is filled in the installation space and has a density less than that of the piston body to reduce the mass of the piston.

[0006] Further, the piston body includes a compression surface for forming a compression chamber with the cylinder sleeve and the cylinder, the installation space includes a mounting area opened on the compression surface, and the filling structure includes a filling portion for filling the mounting area.

[0007] Further, the piston body includes two end faces arranged opposite to each other along its rotation axis, and the minimum distance M between the groove side wall close to the end face and the end face in the installation area is ≥1mm; and / or the piston body also includes an abutment surface for abutting with the cylinder, the abutment surface is connected to the compression surface, the compression surface is arranged in an arc shape, and the minimum arc distance S between the groove side wall close to the abutment surface in the installation area and the abutment surface is ≥2mm.

[0008] Further, along the direction in which the rotation axis of the piston body extends, the piston body includes two end surfaces that are opposite to each other, the installation space includes an installation area that passes through the two end surfaces, and the filling structure includes a filling portion for filling the installation area.

[0009] Furthermore, the shape of the cross-section of the installation area perpendicular to the rotation axis of the piston body is set to be arc-shaped; or the shape of the cross-section of the installation area perpendicular to the rotation axis of the piston body is set to be circular; or the shape of the cross-section of the installation area perpendicular to the rotation axis of the piston body is set to be polygonal.

[0010] Furthermore, the piston body includes a compression surface for forming a compression chamber with the cylinder liner and the cylinder, the compression surface is arranged in an arc shape, the cross-section of the installation area perpendicular to the rotation axis of the piston body is arranged in an arc shape, and the two inner wall surfaces of the installation area arranged opposite to the compression surface are both arranged concentrically with the compression surface.

[0011] Further, the piston body includes a compression surface for forming a compression chamber with the cylinder liner and the cylinder, and the minimum distance N between the inner wall surface of the installation area close to the compression surface and the compression surface is ≥1mm; and / or the piston body includes an abutment surface for abutting with the cylinder, and the minimum distance H between the inner wall surface of the installation area close to the abutment surface and the abutment surface is ≥2mm.

[0012] Furthermore, the piston body includes an abutment surface for abutting against the cylinder; along the first direction, the piston body includes two abutment surfaces arranged opposite to each other; the installation space includes an installation area passing through the two abutment surfaces, and the filling structure includes a filling portion for filling in the installation area.

[0013] Further, the shape of a cross section of the installation area perpendicular to the first direction is set to be polygonal; or the shape of a cross section of the installation area perpendicular to the first direction is set to be circular.

[0014] Further, the cross section of the installation area perpendicular to the rotation axis of the piston body is in an arc shape; or the cross section of the installation area perpendicular to the rotation axis of the piston body is in a strip shape.

[0015] Furthermore, the piston body also includes a compression surface for forming a compression chamber with the cylinder sleeve and the cylinder, and the minimum distance N between the inner wall surface of the installation area close to the compression surface and the compression surface is ≥3 mm.

[0016] Furthermore, the piston body also includes a compression surface for forming a compression chamber with the cylinder sleeve and the cylinder, and the compression surface is arranged in an arc shape; the shape of the cross section of the installation area perpendicular to the first direction is arranged in a circular shape, the shape of the cross section of the installation area perpendicular to the rotation axis of the piston body is arranged in an arc shape, the hole center line of the installation area is arranged in an arc shape, the center O1 of the hole center line is eccentrically arranged with the circle O2 of the compression surface, and the radius R4 of the hole center line is the same as the radius R5 of the compression surface.

[0017] Furthermore, along the second direction, the piston body includes two compression surfaces arranged opposite to each other; the two installation areas are arranged at intervals along the second direction and are respectively arranged one-to-one corresponding to the two compression surfaces; and the minimum distance T between the hole walls of the two installation areas is ≥3 mm.

[0018] Furthermore, an assembly space for installing a rotating shaft is provided on the piston body; along the second direction, the assembly space and the installation space are arranged at intervals; along the second direction, the minimum distance L between the inner wall surface of the installation space close to the assembly space and the inner wall surface of the assembly space close to the installation space is ≥3mm.

[0019] Further, the installation space includes a plurality of installation areas, the filling structure includes a plurality of filling parts, and the plurality of filling parts are installed in the plurality of installation areas in a one-to-one correspondence.

[0020] Furthermore, an assembly space for installing a rotating shaft is provided on the piston body; along the second direction, the piston body includes two compression surfaces arranged opposite to each other, and the two compression surfaces are respectively located on both sides of the assembly space; multiple installation areas are arranged in pairs, and the two paired installation areas are respectively located on both sides of the assembly space along the second direction.

[0021] Furthermore, the filling structure is made of a flexible material so that when the pressure in the compression chamber is too high, the filling structure is deformed to reduce over-compression.

[0022] Furthermore, the filling structure is interference fit with the installation space.

[0023] 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 is 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 center of the rotating shaft is eccentrically arranged with respect to the rotation center 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.

[0024] By applying the technical solution of the present invention, an installation space is provided on the piston body, and a filling part with a low density is filled in the installation space, thereby reducing the mass of the piston while ensuring the overall strength of the piston. Since the magnitude of the centrifugal force of the piston center of mass is proportional to the mass of the piston, the piston provided by the present application has a small mass and generates a small centrifugal force, thereby effectively reducing the vibration of the compressor, reducing the noise of the compressor during use, improving the reliability of the compressor, and further improving the performance of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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:

[0026] Figure 1 A schematic diagram of the main cross-sectional structure of a compressor in the prior art is shown;

[0027] Figure 2 Shows Figure 1 A schematic diagram of a top view cross-sectional structure of a compressor;

[0028] Figure 3 Shows Figure 1 Schematic diagram of the disassembled structure of the compressor;

[0029] Figure 4 Shows Figure 3 A schematic diagram of the three-dimensional structure of the piston in FIG.

[0030] Figure 5 A schematic diagram showing the motion trajectory of the center of mass of the piston;

[0031] Figure 6 The pressure variation curve of the compressor during the suction and exhaust process measured by the test during use is shown;

[0032] Figure 7 The pressure variation curves during the suction and exhaust process with or without overcompression obtained by theoretical calculation during the use of the compressor are shown;

[0033] Figure 8 A schematic diagram of the assembly structure of a piston according to the first embodiment of the present invention is shown;

[0034] Fig. 9 Shows Figure 8 Schematic diagram of the disassembled structure of the piston;

[0035] Fig.10 Shows Figure 8 A schematic diagram of the main structure of the piston in FIG.

[0036] Fig.11 Shows Fig.10 A schematic diagram of a top cross-sectional structure of a piston in FIG.

[0037] Fig.12 A schematic diagram of the disassembled structure of a piston according to the second embodiment of the present invention is shown;

[0038] Fig.13 Shows Fig.12 A schematic diagram of a top cross-sectional structure of a piston in FIG.

[0039] Fig.14 A schematic diagram of the disassembled structure of a piston according to Embodiment 3 of the present invention is shown;

[0040] Fig.15 Shows Fig.14 A schematic diagram of a top cross-sectional structure of a piston in FIG.

[0041] Fig.16 A schematic diagram of the disassembled structure of a piston according to a fourth embodiment of the present invention is shown;

[0042] Fig.17 Shows Fig.16 A schematic diagram of a top cross-sectional structure of a piston in FIG.

[0043] Fig.18 A schematic diagram of the disassembled structure of a piston according to a fifth embodiment of the present invention is shown;

[0044] Fig.19 Shows Fig.18 A schematic diagram of a top cross-sectional structure of a piston in FIG.

[0045] Fig. 20 A schematic diagram of the disassembled structure of a piston according to a sixth embodiment of the present invention is shown;

[0046] Fig.21 Shows Fig. 20 A schematic diagram of a top cross-sectional structure of a piston in FIG.

[0047] Fig. 22 A schematic diagram of the assembly structure of a compressor according to an optional embodiment of the present invention.

[0048] The above drawings include the following reference numerals:

[0049] 1. Cylinder liner; 2. Cylinder; 3. Piston; 10. Piston body; 11. Compression surface; 12. Abutment surface; 100. Installation space; 110. Installation area; 200. Assembly space; 20. Filling structure; 21. Filling part; 4. Rotating shaft; 5. Compression chamber. DETAILED DESCRIPTION

[0050] 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.

[0051] 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, wherein the compressor comprises the piston described above and below.

[0052] The present application provides six illustrated specific embodiments according to different setting positions and setting shapes of the installation space 100 . The six embodiments are described in detail below with reference to the accompanying drawings.

[0053] Embodiment 1

[0054] like Figures 8 to 11 As shown, the piston includes a piston body 10 and a filling structure 20. The piston body 10 is provided with an installation space 100. The filling structure 20 is filled in the installation space 100. The density of the filling structure 20 is less than that of the piston body 10 to reduce the mass of the piston.

[0055] In this embodiment, a mounting space 100 is provided on the piston body 10, and a filling structure 20 with a relatively low density is filled in the mounting space 100. Under the condition of the same volume, the lower the density, the lower the mass, thereby reducing the mass of the piston while ensuring the overall structural strength of the piston. Since the magnitude of the centrifugal force of the piston center of mass is proportional to the mass of the piston, the piston provided in this embodiment has a relatively small mass and a relatively small 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.

[0056] like Figures 1 to 4As 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 cylinder piston compressor in the related technology 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.

[0057] Optionally, the filling structure 20 is made of a flexible material so that when the pressure in the compression chamber 5 is too high, the filling structure 20 is deformed to reduce over-compression. In this way, the piston and the compressor provided by the present application have less over-compression loss during use, which reduces the power consumption of the compressor, thereby improving the performance of the compressor.

[0058] Optionally, the flexible material is nitrile rubber or carbon fiber composite material.

[0059] Optionally, the piston body 10 is made of high speed steel material.

[0060] Optionally, the filling structure 20 and the installation space 100 are interference fit, and the assembly is simple and reliable.

[0061] like Figures 8 to 11 As shown, the piston body 10 includes a compression surface 11 for forming a compression chamber 5 with the cylinder liner 1 and the cylinder 2, the installation space 100 includes a mounting area 110 opened on the compression surface 11, and the filling structure 20 includes a filling portion 21 for filling the mounting area 110. In the first embodiment, the mounting area 110 is a mounting groove opened on the compression surface 11, which facilitates the processing of the mounting area 110 and the assembly of the filling portion 21, and is conducive to improving the production efficiency of the piston.

[0062] Alternatively, the piston 3' in the prior art can be modified by hollowing out the head of the piston 3' and then embedding a light flexible material with the same geometric shape as the hollowed-out part. The light flexible material arranged on the piston head directly contacts the refrigerant and has a large improvement area, and the improvement effect is obvious.

[0063] This embodiment also optimizes the size parameters related to the installation area 110 to ensure the structural strength of the piston body 10 after the grooves are opened and the sealing between the piston and the cylinder 2. Fig.10As shown, the piston body 10 includes two end faces arranged opposite to each other along its rotation axis, and the minimum distance M between the groove side wall close to the end face and the end face of the installation area 110 is ≥ 1 mm. The test shows that when the numerical range of M meets the above conditions, the performance of the piston is better.

[0064] This embodiment also optimizes the size parameters related to the installation area 110 to ensure the structural strength of the piston body 10 after the grooves are opened and the sealing between the piston and the cylinder 2. Fig.11 As shown, the piston body 10 further includes an abutting surface 12 for abutting against the cylinder 2, the abutting surface 12 is connected to the compression surface 11, the compression surface 11 is arranged in an arc shape, and the minimum arc distance S between the groove side wall close to the abutting surface 12 of the installation area 110 and the abutting surface 12 is ≥ 2mm. The test shows that when the numerical range of S meets the above conditions, the performance of the piston is good.

[0065] This embodiment also optimizes the size parameters related to the installation area 110 to ensure the structural strength of the piston body 10 after the grooves are opened and the sealing between the piston and the cylinder 2. Fig.11 As shown, the piston body 10 is provided with an assembly space 200 for mounting the rotating shaft 4; along the second direction, the assembly space 200 and the mounting space 100 are arranged at intervals; along the second direction, the minimum distance L between the inner wall surface of the mounting space 100 close to the assembly space 200 and the inner wall surface of the mounting space 200 close to the mounting space 100 is ≥3 mm. The test shows that when the value range of L meets the above conditions, the performance of the piston is better.

[0066] Among them, the inner wall surface of the assembly space 200 close to the installation space 100 is the shaft supporting surface. It is necessary to ensure that the minimum distance L between the inner wall surface of the installation space 100 close to the assembly space 200 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.

[0067] In embodiment one, since part of the surface of the filling portion 21 and the compression surface 11 together form the compression chamber 5, the filling portion 21 is in direct contact with the refrigerant and has a large improvement area. When the pressure in the compression chamber 5 is too high, the filling portion 21 made of flexible material can be deformed under the action of pressure, thereby achieving a better effect in reducing over-compression losses.

[0068] Optionally, the installation space 100 includes a plurality of installation areas 110, and the filling structure 20 includes a plurality of filling parts 21, and the plurality of filling parts 21 are installed in the plurality of installation areas 110 in a one-to-one correspondence. In this way, the performance of the piston is further improved while the structural strength of the piston is ensured.

[0069] Optionally, the piston body 10 is further provided with an assembly space 200 for installing the rotating shaft 4; along the second direction, the piston body 10 includes two compression surfaces 11 arranged opposite to each other, and the two compression surfaces 11 are respectively located on both sides of the assembly space 200; a plurality of installation areas 110 are arranged in pairs, and the two paired installation areas 110 are respectively located on both sides of the assembly space 200 along the second direction. Since the piston body 10 is a symmetrical structure, arranging the installation areas 110 in pairs is conducive to further improving the performance of the piston.

[0070] like Fig.11 As shown, in the first embodiment, the piston body 10 includes two mounting areas 110, which are symmetrically arranged on both sides of the assembly space 200, and the two mounting areas 110 are arranged one-to-one with the two compression surfaces 11, so that the filling portion 21 is deformed when over-compressed to reduce over-compression loss. In addition, the symmetrically arranged structure is conducive to ensuring the smooth movement of the piston.

[0071] like Fig. 22 The present application also provides a compressor, which includes the piston in Example 1 of the present application, and the head of the piston body 10 of the piston 3 is provided with a filling structure 20 made of a lightweight and flexible material, which is beneficial to reduce the noise of the compressor and reduce the over-compression loss of the compressor, thereby improving the performance of the compressor.

[0072] like Fig. 22 As shown, the compressor includes a cylinder sleeve 1, a cylinder 2, a piston 3 and a rotating shaft 4. The cylinder 2 is pivotally arranged in the cylinder sleeve 1, the piston 3 is installed in the cylinder 2 and is slidably connected with the cylinder 2, the piston 3 is the above-mentioned piston, the rotating shaft 4 is slidably connected with the piston 3, and the rotation center of the rotating shaft 4 is eccentrically arranged with the rotation center of the cylinder 2; wherein, the compression surface 11 of the piston 3 and the inner wall surface of the cylinder 2 and the inner wall surface of the cylinder sleeve 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 sleeve 1, and the piston 3 slides relative to the cylinder 2 and causes the size of the compression chamber 5 to change.

[0073] Optionally, the compressor provided in the present application is used in a refrigeration system, for example, in an air conditioner.

[0074] Embodiment 2

[0075] The difference between the second embodiment and the first embodiment is that the installation area 110 is set at a different location. Specifically, Fig.12 and Fig.13As shown, along the direction in which the rotation axis of the piston body 10 extends, the piston body 10 includes two end faces arranged opposite to each other, the installation space 100 includes an installation area 110 that penetrates the two end faces, and the filling structure 20 includes a filling portion 21 for filling in the installation area 110. When assembling the filling portion 21, the assembly is simple, convenient and fast, and the assembly processability is good.

[0076] Optionally, the installation area 110 is a installation hole that penetrates the two end surfaces. After the filling portion 21 is interference-fitted in the installation area 110 , the connection stability between the filling portion 21 and the piston body 10 is better.

[0077] like Fig.12 and Fig.13 As shown, the cross section of the installation area 110 perpendicular to the rotation axis of the piston body 10 is in an arc shape. Since the compression surface 11 is in an arc shape, the geometric shape of the installation area 110 is set to an arc shape that matches the compression surface 11, which is more conducive to the compression surface 11 of the piston body 10 deforming toward one side of the installation area 110 when the pressure in the compression chamber 5 is too high, and the filling portion 21 located in the installation area 110 is deformed accordingly, so that the over-compression loss can be better reduced.

[0078] like Fig.13 As shown, the piston body 10 includes a compression surface 11 for enclosing a compression chamber 5 with the cylinder liner 1 and the cylinder 2. The compression surface 11 is arranged in an arc shape. The shape of the cross section of the installation area 110 perpendicular to the rotation axis of the piston body 10 is arranged in an arc shape. The two inner wall surfaces of the installation area 110 arranged opposite to the compression surface 11 are both arranged concentrically with the compression surface 11.

[0079] like Fig.13 As shown, the piston body 10 includes a compression surface 11 for forming a compression chamber 5 with the cylinder liner 1 and the cylinder 2, and the minimum distance N between the inner wall surface of the installation area 110 close to the compression surface 11 and the compression surface 11 is ≥ 1mm. In this way, the thickness of the head of the hollowed-out piston body 10 meets the use requirements and the structural strength of the piston body 10 is ensured.

[0080] like Fig.13 As shown, R1, R2 and R3 are all concentrically arranged, and R1-R2≥1mm, that is, the thickness of the piston head after hollowing out is not less than 1mm.

[0081] like Fig.13 As shown, the piston body 10 includes an abutting surface 12 for abutting against the cylinder 2 , and a minimum distance H between an inner wall surface of the mounting area 110 close to the abutting surface 12 and the abutting surface 12 is ≥ 2 mm.

[0082] Embodiment 3

[0083] The difference between the third embodiment and the second embodiment is that the geometric shape of the installation area 110 is different, such as Fig.14 and Fig.15 As shown, the cross section of the installation area 110 perpendicular to the rotation axis of the piston body 10 is circular, which is conducive to simplifying the processing technology of the piston body 10.

[0084] Embodiment 4

[0085] The difference between the fourth embodiment and the second embodiment is that the geometric shape of the installation area 110 is different. The cross section of the installation area 110 perpendicular to the rotation axis of the piston body 10 is polygonal, which is conducive to simplifying the processing technology of the piston body 10.

[0086] like Fig.16 and Fig.17 As shown, the cross section of the mounting area 110 perpendicular to the rotation axis of the piston body 10 is in the shape of a rectangle.

[0087] Optionally, the corners between two adjacent inner wall surfaces of the installation area 110 are rounded.

[0088] Embodiment 5

[0089] The difference between the fifth embodiment and the first embodiment is that the installation area 110 is arranged at a different position. Fig.18 and Fig.19 As shown, the piston body 10 includes an abutting surface 12 for abutting against the cylinder 2; along the first direction, the piston body 10 includes two abutting surfaces 12 arranged opposite to each other; the installation space 100 includes an installation area 110 that passes through the two abutting surfaces 12, and the filling structure 20 includes a filling portion 21 for filling the installation area 110. When assembling the filling portion 21, the assembly is simple, convenient and fast, and the assembly processability is good.

[0090] Alternatively, if Fig.19 As shown, the cross section of the mounting area 110 perpendicular to the rotation axis of the piston body 10 is in the shape of a strip. In this way, the filling portion 21 can be easily installed in the mounting area 110, and the assembly performance is good.

[0091] Optionally, the cross section of the mounting area 110 perpendicular to the first direction is in the shape of a polygon. In this way, the mounting area 110 and the filling portion 21 have better processing properties.

[0092] like Fig.18 As shown, the cross section of the installation area 110 perpendicular to the first direction is rectangular, with a simple structure and easy processing and assembly.

[0093] Optionally, the piston 3' in the prior art can be modified, that is, a square through hole is dug on the side of the piston 3' as the installation area 110. Optionally, a square through hole is dug in the middle of the side of the piston 3' in the extension direction of its rotation axis; two symmetrically arranged square through holes are dug on both sides of the assembly space 200, and the two square through holes are spaced apart from the two compression surfaces 11 along the second direction; the first direction and the second direction are perpendicular, and the first direction and the second direction are both perpendicular to the rotation axis of the piston.

[0094] like Fig.18 and Fig.19 As shown, the piston body 10 also includes a compression surface 11 for forming a compression chamber 5 with the cylinder liner 1 and the cylinder 2. The minimum distance N between the inner wall surface of the installation area 110 close to the compression surface 11 and the compression surface 11 is ≥3mm, which is conducive to ensuring the structural strength of the piston.

[0095] like Fig.18 and Fig.19 As shown, after the filling part 21 is installed in the installation area 110, a part of the surface of the filling part 21 exposed to the outside and the compression surface 11 of the piston body 10 together form a compression chamber 5, and another part of the surface of the filling part 21 exposed to the outside and the abutment surface 12 of the piston body 10 abut against the inner wall of the cylinder 2 together.

[0096] Embodiment 6

[0097] The difference between the sixth embodiment and the fifth embodiment is that the geometric shape of the installation area 110 is different, such as Fig. 20 and Fig.21 As shown, the cross section of the mounting area 110 perpendicular to the rotation axis of the piston body 10 is in an arc shape. In this way, when the pressure in the compression chamber 5 is high, the piston body 10 is conducive to deformation toward the side of the mounting area 110, thereby reducing the over-compression loss of the compressor.

[0098] Alternatively, if Fig. 20 As shown, the cross section of the mounting area 110 perpendicular to the first direction is in a circular shape. In this way, the mounting area 110 and the filling portion 21 have better processing properties.

[0099] like Fig.21As shown, the piston body 10 also includes a compression surface 11 for forming a compression chamber 5 with the cylinder sleeve 1 and the cylinder 2, and the compression surface 11 is set in an arc shape; the shape of the cross section of the installation area 110 perpendicular to the first direction is set in a circular shape, the shape of the cross section of the installation area 110 perpendicular to the rotation axis of the piston body 10 is set in an arc shape, the hole center line of the installation area 110 is set in an arc shape, the center O1 of the hole center line is eccentrically set to the circle O2 of the compression surface 11, and the radius R4 of the hole center line is the same as the radius R5 of the compression surface 11. In this way, by optimizing the size parameters of the installation area 110, the processing of the installation area 110 is facilitated and the performance of the piston and the compressor is improved.

[0100] like Fig.21 As shown, along the second direction, the piston body 10 includes two compression surfaces 11 arranged opposite to each other; the two installation areas 110 are arranged at intervals along the second direction and are respectively arranged one-to-one with the two compression surfaces 11; the minimum distance T between the hole walls of the two installation areas 110 is ≥ 3 mm. In this way, by limiting the minimum distance between the hole walls of the two installation areas 110, the structural strength of the piston body 10 after the two installation areas 110 are arranged is ensured.

[0101] Since lightweight materials with lower density have poor wear resistance and their rigidity cannot meet the use requirements, the material of the piston cannot be directly changed to lightweight materials with lower density. The piston provided in the present application includes a piston body 10 and a filling structure 20. The piston body 10 is hollowed out to form an installation space 100, thereby reducing the mass of the piston body 10. At the same time, in order to improve the strength of the piston, the filling structure 20 is installed at the installation space 100. Under the premise of ensuring reliability, the mass of the piston is reduced, thereby reducing vibration. In addition, the filling structure 20 is made of a flexible material, so that when the compressor is over-compressed at the end of the exhaust, the piston body 10 and the filling structure 20 are deformed to reduce the over-compression loss, avoid the increase of the exhaust loss, and improve the efficiency of the compressor.

[0102] Specifically, the filling structure 20 is embedded in the piston head or the end face of the piston or the side face of the piston to reduce the mass of the piston, thereby reducing the centrifugal force during the movement of the piston, reducing the vibration of the compressor, reducing noise, and improving the energy efficiency of the compressor; at the same time, when the pressure on the piston head reaches a certain level, the piston can produce elastic deformation, which can avoid excessive local pressure, reduce over-compression, and improve the efficiency of the compressor.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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, characterized in that: include: A piston body (10), wherein an installation space (100) is provided on the piston body (10); A filling structure (20), the filling structure (20) being filled in the installation space (100), the density of the filling structure (20) being lower than the density of the piston body (10), so as to reduce the mass of the piston; The piston body (10) comprises a compression surface (11) for enclosing a compression chamber (5) with the cylinder sleeve (1) and the cylinder (2); the installation space (100) comprises an installation area (110) opened on the compression surface (11); and the filling structure (20) comprises a filling portion (21) for filling the installation area (110); The piston body (10) comprises two end faces arranged opposite to each other along its rotation axis, and a minimum distance M between a groove side wall of the mounting area (110) close to the end faces and the end faces is ≥1 mm; and / or The piston body (10) further comprises an abutment surface (12) for abutting against the cylinder (2), wherein the abutment surface (12) is connected to the compression surface (11), the compression surface (11) is arranged in an arc shape, and a minimum arc distance S between a groove side wall of the mounting area (110) close to the abutment surface (12) and the abutment surface (12) is ≥2 mm.

2. The piston according to claim 1, characterized in that The piston body (10) is provided with an assembly space (200) for installing the rotating shaft (4); Along the second direction, the assembly space (200) and the installation space (100) are arranged at intervals; Along the second direction, a minimum distance L between an inner wall surface of the installation space (100) close to the assembly space (200) and an inner wall surface of the assembly space (200) close to the installation space (100) is ≥3 mm.

3. The piston according to claim 1, characterized in that The installation space (100) comprises a plurality of installation areas (110), and the filling structure (20) comprises a plurality of filling parts (21), wherein the plurality of filling parts (21) are installed in the plurality of installation areas (110) in a one-to-one correspondence.

4. The piston according to claim 3, characterized in that The piston body (10) is also provided with an assembly space (200) for installing the rotating shaft (4); Along the second direction, the piston body (10) comprises two compression surfaces (11) arranged opposite to each other, and the two compression surfaces (11) are respectively located on two sides of the assembly space (200); The plurality of installation areas (110) are arranged in pairs, and the two installation areas (110) in a pair are respectively located on two sides of the assembly space (200) along the second direction.

5. The piston according to claim 1, characterized in that The filling structure (20) is made of a flexible material so that when the pressure in the compression chamber (5) is too high, the filling structure (20) is deformed to reduce over-compression.

6. The piston according to claim 1, characterized in that The filling structure (20) is interference-fitted with the installation space (100).

7. A piston, characterized in that: include: A piston body (10), wherein an installation space (100) is provided on the piston body (10); A filling structure (20), the filling structure (20) being filled in the installation space (100), the density of the filling structure (20) being lower than the density of the piston body (10), so as to reduce the mass of the piston; Along the direction in which the rotation axis of the piston body (10) extends, the piston body (10) comprises two end surfaces arranged opposite to each other, the installation space (100) comprises an installation area (110) penetrating the two end surfaces, and the filling structure (20) comprises a filling portion (21) for filling the installation area (110); The piston body (10) comprises a compression surface (11) for forming a compression chamber (5) with the cylinder liner (1) and the cylinder (2), and a minimum distance N between an inner wall surface of the mounting area (110) close to the compression surface (11) and the compression surface (11) is ≥ 1 mm; and / or The piston body (10) comprises an abutment surface (12) for abutting against the cylinder (2), and a minimum distance H between an inner wall surface of the mounting area (110) close to the abutment surface (12) and the abutment surface (12) is ≥2 mm.

8. The piston according to claim 7, characterized in that The cross section of the installation area (110) perpendicular to the rotation axis of the piston body (10) is in an arc shape; or The cross-section of the mounting area (110) perpendicular to the rotation axis of the piston body (10) is in the shape of a circle; or The cross-section of the installation area (110) which is perpendicular to the rotation axis of the piston body (10) is in the shape of a polygon.

9. The piston according to claim 7, characterized in that The piston body (10) comprises a compression surface (11) for forming a compression chamber (5) with a cylinder sleeve (1) and a cylinder (2); the compression surface (11) is arranged in an arc shape; the cross section of the installation area (110) perpendicular to the rotation axis of the piston body (10) is arranged in an arc shape; and two inner wall surfaces of the installation area (110) arranged opposite to the compression surface (11) are both arranged concentrically with the compression surface (11).

10. The piston according to claim 7, characterized in that The piston body (10) is provided with an assembly space (200) for installing the rotating shaft (4); Along the second direction, the assembly space (200) and the installation space (100) are arranged at intervals; Along the second direction, a minimum distance L between an inner wall surface of the installation space (100) close to the assembly space (200) and an inner wall surface of the assembly space (200) close to the installation space (100) is ≥3 mm.

11. The piston according to claim 7, characterized in that The installation space (100) comprises a plurality of installation areas (110), and the filling structure (20) comprises a plurality of filling parts (21), wherein the plurality of filling parts (21) are installed in the plurality of installation areas (110) in a one-to-one correspondence.

12. The piston according to claim 11, characterized in that The piston body (10) is also provided with an assembly space (200) for installing the rotating shaft (4); Along the second direction, the piston body (10) comprises two compression surfaces (11) arranged opposite to each other, and the two compression surfaces (11) are respectively located on two sides of the assembly space (200); The plurality of installation areas (110) are arranged in pairs, and the two installation areas (110) in a pair are respectively located on two sides of the assembly space (200) along the second direction.

13. The piston according to claim 7, characterized in that The filling structure (20) is made of a flexible material so that when the pressure in the compression chamber (5) is too high, the filling structure (20) is deformed to reduce over-compression.

14. The piston according to claim 7, characterized in that The filling structure (20) is interference-fitted with the installation space (100).

15. A piston, characterized in that: include: A piston body (10), wherein an installation space (100) is provided on the piston body (10); A filling structure (20), the filling structure (20) being filled in the installation space (100), the density of the filling structure (20) being lower than the density of the piston body (10), so as to reduce the mass of the piston; The piston body (10) comprises an abutment surface (12) for abutting against the cylinder (2); Along the first direction, the piston body (10) comprises two abutment surfaces (12) arranged opposite to each other; The installation space (100) comprises an installation area (110) penetrating the two abutment surfaces (12), and the filling structure (20) comprises a filling portion (21) for filling the installation area (110); The piston body (10) further comprises a compression surface (11) for forming a compression chamber (5) with the cylinder liner (1) and the cylinder (2); the minimum distance N between the inner wall surface of the mounting area (110) close to the compression surface (11) and the compression surface (11) is ≥3 mm.

16. The piston according to claim 15, characterized in that The cross section of the installation area (110) perpendicular to the first direction is in the shape of a polygon.

17. The piston according to claim 15, characterized in that The cross section of the installation area (110) which is perpendicular to the rotation axis of the piston body (10) is in the shape of a strip.

18. The piston according to claim 15, characterized in that The piston body (10) is provided with an assembly space (200) for installing the rotating shaft (4); Along the second direction, the assembly space (200) and the installation space (100) are arranged at intervals; Along the second direction, a minimum distance L between an inner wall surface of the installation space (100) close to the assembly space (200) and an inner wall surface of the assembly space (200) close to the installation space (100) is ≥3 mm.

19. The piston according to claim 15, characterized in that The installation space (100) comprises a plurality of installation areas (110), and the filling structure (20) comprises a plurality of filling parts (21), wherein the plurality of filling parts (21) are installed in the plurality of installation areas (110) in a one-to-one correspondence.

20. The piston according to claim 19, characterized in that The piston body (10) is also provided with an assembly space (200) for installing the rotating shaft (4); Along the second direction, the piston body (10) comprises two compression surfaces (11) arranged opposite to each other, and the two compression surfaces (11) are respectively located on two sides of the assembly space (200); The plurality of installation areas (110) are arranged in pairs, and the two installation areas (110) in a pair are respectively located on two sides of the assembly space (200) along the second direction.

21. The piston according to claim 15, characterized in that The filling structure (20) is made of a flexible material so that when the pressure in the compression chamber (5) is too high, the filling structure (20) is deformed to reduce over-compression.

22. The piston according to claim 15, characterized in that The filling structure (20) is interference-fitted with the installation space (100).

23. A piston, characterized in that: include: A piston body (10), wherein an installation space (100) is provided on the piston body (10); A filling structure (20), the filling structure (20) being filled in the installation space (100), the density of the filling structure (20) being lower than the density of the piston body (10), so as to reduce the mass of the piston; The piston body (10) comprises an abutment surface (12) for abutting against the cylinder (2); Along the first direction, the piston body (10) comprises two abutment surfaces (12) arranged opposite to each other; The installation space (100) comprises an installation area (110) penetrating the two abutment surfaces (12), and the filling structure (20) comprises a filling portion (21) for filling the installation area (110); The piston body (10) further comprises a compression surface (11) for forming a compression chamber (5) with the cylinder sleeve (1) and the cylinder (2); the compression surface (11) is arranged in the shape of a circular arc; The shape of the cross section of the installation area (110) perpendicular to the first direction is circular, the shape of the cross section of the installation area (110) perpendicular to the rotation axis of the piston body (10) is arc-shaped, the hole center line of the installation area (110) is arc-shaped, the center O1 of the hole center line is eccentric to the circle O2 of the compression surface (11), and the radius R4 of the hole center line is the same as the radius R5 of the compression surface (11).

24. The piston according to claim 23, characterized in that Along the second direction, the piston body (10) comprises two compression surfaces (11) arranged opposite to each other; the two installation areas (110) are arranged at intervals along the second direction and are respectively arranged in one-to-one correspondence with the two compression surfaces (11); and the minimum distance T between the hole walls of the two installation areas (110) is ≥3 mm.

25. The piston according to claim 23, characterized in that The installation space (100) comprises a plurality of installation areas (110), and the filling structure (20) comprises a plurality of filling parts (21), wherein the plurality of filling parts (21) are installed in the plurality of installation areas (110) in a one-to-one correspondence.

26. The piston according to claim 25, characterized in that The piston body (10) is also provided with an assembly space (200) for installing the rotating shaft (4); Along the second direction, the piston body (10) comprises two compression surfaces (11) arranged opposite to each other, and the two compression surfaces (11) are respectively located on two sides of the assembly space (200); The plurality of installation areas (110) are arranged in pairs, and the two installation areas (110) in a pair are respectively located on two sides of the assembly space (200) along the second direction.

27. The piston according to claim 23, characterized in that The filling structure (20) is made of a flexible material so that when the pressure in the compression chamber (5) is too high, the filling structure (20) is deformed to reduce over-compression.

28. The piston according to claim 23, characterized in that The filling structure (20) is interference-fitted with the installation space (100).

29. A compressor, characterized in that: include: Cylinder liner (1); A cylinder (2), the cylinder (2) being pivotably 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 28; A rotating shaft (4), the rotating shaft (4) being slidably connected to the piston (3), and the rotation center of the rotating shaft (4) being eccentrically arranged with respect to the rotation center of the cylinder (2); The compression surface (11) of the piston (3) and the inner wall surface of the cylinder (2) and the inner wall surface of the cylinder sleeve (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 sleeve (1); the piston (3) slides relative to the cylinder (2) and causes the size of the compression chamber (5) to change.

Images