Eccentric sleeve, oil return device and scroll compressor

Abstract

The present invention discloses an eccentric sleeve, an oil return device and a scroll compressor, which relate to the technical field of compressors and solve the technical problem in the prior art that the heat dissipation and lubrication effect of the compressor are affected by the yellow oil stains and impurities appearing on the through hole and end surface of the eccentric sleeve. The eccentric sleeve of the present invention comprises a mounting portion, the mounting portion has a through hole, the crankshaft is assembled in the through hole and a gap is formed between the through holes, and at least one oil return structure is also provided on the mounting portion, and at least one oil return structure is connected to the gap. The eccentric sleeve of the present invention can discharge the yellow oil stains and impurities attached to the mounting portion of the eccentric sleeve through at least one oil return structure and / or the gap between the crankshaft and the through hole, thereby improving the oil return and lubrication effect of the compressor and increasing the service life of the compressor.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to an eccentric sleeve, an oil return device and a scroll compressor. Background Art

[0002] Scroll compressors have become the preferred compressor type in passenger cars due to their small size and high efficiency, and the eccentric sleeve is a commonly used flexible sealing structure in existing automotive scroll compressors. Figure 1 The schematic diagram of the structure after the eccentric sleeve and the crankshaft are assembled in the prior art is shown; Figure 2 A top view of an eccentric sleeve in the prior art is shown; Figure 3 A cross-sectional view of a preferred embodiment of a prior art turbo compressor is shown. Figure 1 to Figure 3 As shown, in the prior art, the eccentric sleeve and the crankshaft are clearance-matched, and there is no lubrication channel on the eccentric sleeve. The lubrication, heat dissipation and other effects can only be achieved through the clearance between the two.

[0003] However, after the compressor has been working for a period of time, due to the high-speed rotation between the eccentric sleeve and the crankshaft, high temperature is generated, causing yellow oil stains and impurities to appear on the through hole and end surface of the eccentric sleeve, resulting in poor oil flow. Therefore, when the eccentric sleeve and the crankshaft rotate at high speed, the prior art cannot achieve good heat dissipation and lubrication effects by relying solely on the matching clearance between the eccentric sleeve and the crankshaft, nor can it discharge the accumulated impurities in time, thereby reducing the service life of the compressor.

[0004] Therefore, there is an urgent need to improve the eccentric sleeve in the prior art to improve the lubrication effect of the compressor. Summary of the invention

[0005] One of the purposes of the present invention is to provide an eccentric sleeve, which solves the technical problem in the prior art that the heat dissipation and lubrication effect of the compressor are affected by the yellow oil stains and impurities on the through hole and end surface of the eccentric sleeve. The many technical effects that can be produced by the preferred technical solution of the present invention are described in detail below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The eccentric sleeve of the present invention comprises a mounting portion having a through hole, the crankshaft is assembled in the through hole and forms a gap with the through hole, and at least one oil return structure is also arranged on the mounting portion, and the at least one oil return structure is connected to the gap.

[0008] According to a preferred embodiment, the at least one oil return structure comprises a first oil return groove assembly, which is located on the wall surface of the through hole and extends from one end surface of the through hole to the other end surface.

[0009] According to a preferred embodiment, the first oil return groove assembly includes at least one first oil return groove.

[0010] According to a preferred embodiment, the eccentric sleeve further comprises a sector-shaped surface, which is located outside the end surface of the mounting portion and is integrally formed with the end surface.

[0011] According to a preferred embodiment, the first oil return groove is located on the wall surface of the through hole opposite to the sector surface.

[0012] According to a preferred embodiment, the at least one oil return structure further comprises a second oil return groove assembly, and the second oil return groove assembly is located on the end surface of the mounting portion.

[0013] According to a preferred embodiment, the second oil return groove assembly includes at least one second oil return groove.

[0014] According to a preferred embodiment, the second oil return groove extends from a side of the end surface away from the through hole to a side of the end surface close to the through hole.

[0015] According to a preferred embodiment, the second oil return groove is located on the end surface connected to the sector surface. According to a preferred embodiment, the depth of the first oil return groove and / or the second oil return groove is 0.1-10 mm.

[0016] According to a preferred embodiment, the cross section of the first oil return groove and / or the second oil return groove is one of an arc-shaped structure and a polygonal structure.

[0017] Another aspect of the present invention further provides an oil return device, which includes at least one oil return structure on the eccentric sleeve as described in any technical solution of the present invention.

[0018] Another aspect of the present invention further provides a scroll compressor, wherein the scroll compressor comprises the oil return device according to any technical solution of the present invention.

[0019] The eccentric sleeve provided by the present invention has at least the following beneficial technical effects:

[0020] The present invention arranges at least one oil return structure on the mounting portion of the eccentric sleeve, and the at least one oil return structure is connected to the gap formed between the crankshaft and the through hole, so that yellow oil stains and impurities appearing on the mounting portion of the eccentric sleeve during the operation of the compressor can be discharged through the at least one oil return structure and / or the gap between the crankshaft and the through hole, thereby avoiding the problem that the gap formed between the crankshaft and the through hole is too small, causing the yellow oil stains to adhere and impurities to accumulate on the eccentric sleeve, thereby affecting the heat dissipation and lubrication effects of the compressor.

[0021] The eccentric sleeve of the present invention can reduce yellow oil stains and impurities on the mounting portion of the eccentric sleeve by arranging at least one oil return structure on the mounting portion, thereby solving the technical problem in the prior art that the heat dissipation and lubrication effect of the compressor are affected by the appearance of yellow oil stains and impurities on the through hole and end surface of the eccentric sleeve. The eccentric sleeve of the present invention can improve the oil return and lubrication effect of the compressor, thereby increasing the service life of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure after the eccentric sleeve and the crankshaft are assembled in the prior art;

[0024] Figure 2 It is a top view of an eccentric sleeve in the prior art;

[0025] Figure 3 is a cross-sectional view of a preferred embodiment of a prior art turbo compressor;

[0026] Figure 4 It is a structural schematic diagram of a preferred embodiment of the eccentric sleeve of the present invention;

[0027] Figure 5 is a top view of a preferred embodiment of the eccentric sleeve of the present invention;

[0028] Figure 6 It is a cross-sectional view of a preferred embodiment of the turbo compressor of the present invention.

[0029] In the figure, 1 is the eccentric sleeve; 101 is the mounting portion; 102 is the through hole; 103 is the end face; 104 is the sector face; 105 is the first oil return groove; 106 is the second oil return groove; 2 is the crankshaft; 3 is the housing assembly; 4 is the front cover assembly; 5 is the stationary plate assembly; 6 is the moving plate assembly; 7 is the bracket assembly; 8 is the rotor assembly; 9 is the stator assembly; 10 is the air intake port; 11 is the exhaust port. DETAILED DESCRIPTION

[0030] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0031] Example 1

[0032] Combination Figure 4 and Figure 5 The eccentric sleeve of this embodiment is described in detail.

[0033] The eccentric sleeve of this embodiment includes a mounting portion 101, and the mounting portion 101 has a through hole 102. Figure 4 or Figure 5 The crankshaft 2 is assembled in the through hole 102 and forms a gap with the through hole 102. At least one oil return structure is also provided on the mounting portion 101, and the at least one oil return structure is communicated with the gap.

[0034] In this embodiment, at least one oil return structure is arranged on the mounting portion 101 of the eccentric sleeve, and the at least one oil return structure is connected to the gap formed between the crankshaft 2 and the through hole 102, so that the yellow oil stains and impurities appearing on the mounting portion through hole 102 and the end face 103 during the operation of the compressor can be discharged through the at least one oil return structure and / or the gap between the crankshaft 2 and the through hole 102, thereby avoiding the problem that the gap formed between the crankshaft 2 and the through hole 102 is too small, causing the yellow oil stains to adhere and impurities to accumulate on the eccentric sleeve, thereby affecting the heat dissipation and lubrication effect of the compressor.

[0035] The eccentric sleeve of this embodiment is provided with at least one oil return structure on the mounting portion 101, which can reduce the yellow oil stains and impurities on the eccentric sleeve through hole 102 and the end face 103, thereby solving the technical problem in the prior art that the heat dissipation and lubrication effects are affected by the appearance of yellow oil stains and impurities in the eccentric sleeve through hole 102 and the end face 103. The eccentric sleeve of the present invention can improve the oil return and lubrication effects of the compressor, thereby increasing the service life of the compressor.

[0036] According to a preferred embodiment, at least one oil return structure includes a first oil return groove assembly, which is located on the wall of the through hole 102 and extends from one end surface to the other end surface of the through hole 102. That is, the length of the first oil return groove assembly is equivalent to the height of the through hole 102. Preferably, the first oil return groove assembly includes at least one first oil return groove 105, such as Figure 4 or Figure 5 shown.

[0037] In the prior art, the crankshaft 2 is assembled in the through hole 102 and forms a gap with the through hole 102. However, the gap is too small, so that the yellow oil stains and impurities generated during the operation of the compressor cannot be discharged in time, and thus adhere to the eccentric sleeve through hole 102 or the end surface 103. The preferred technical solution of this embodiment is to set a first oil return groove assembly on the wall surface of the through hole 102, and the first oil return groove assembly extends from one end surface of the through hole 102 to the other end surface, so that the yellow oil stains and impurities attached to the through hole 102 or the end surface 103 can be discharged in time through the first oil return groove assembly, avoiding affecting the heat dissipation and lubrication effect of the compressor.

[0038] The first oil return groove assembly of the preferred technical solution of this embodiment includes at least one first oil return groove 105. Preferably, the first oil return groove assembly includes two or more first oil return grooves 105, and the plurality of first oil return grooves 105 are arranged at intervals from each other. The preferred technical solution of this embodiment includes at least one first oil return groove 105, which can timely discharge the yellow oil stains and impurities generated during the operation of the compressor to prevent them from accumulating on the mounting portion 101 of the eccentric sleeve and affecting the heat dissipation and lubrication effect of the compressor.

[0039] According to a preferred embodiment, the mounting portion 101 further includes an end surface 103, which is located outside the through hole 102 and is integrally formed with the through hole 102. Figure 4 or Figure 5 shown.

[0040] According to a preferred embodiment, the eccentric sleeve of the preferred technical solution of this embodiment further includes a sector surface 104. Preferably, the sector surface 104 is located outside the end surface 103 of the mounting portion 101 and is integrally formed with the end surface 103. Figure 4 or Figure 5 Preferably, the arc of the sector surface 104 is 120°. The arc of the sector surface 104 can also be said to be the angle of the sector area is 120°.

[0041] According to a preferred embodiment, the first oil return groove 105 is located on the wall surface of the through hole 102 opposite to the sector surface 104. That is, the first oil return groove 105 is located on the wall surface of the through hole 102 not connected to the sector surface 104.

[0042] Due to the influence of the eccentricity caused by high-speed rotation, most of the yellow oil stains generated by the compressor exist on the wall surface of the through hole 102 opposite to the sector surface 104, that is, the position of the yellow oil stains is opposite to the sector surface 104. Therefore, the first oil return groove 105 is arranged on the wall surface opposite to the through hole 102 and the sector surface 104, so that the generated oil stains can be discharged in time, avoiding the adhesion of yellow oil stains and accumulation of impurities in the eccentric sleeve through hole 102, so that the short shaft end of the crankshaft 2 (the end close to the eccentric circle) and the through hole 102 can better dissipate heat at the fitting point.

[0043] According to a preferred embodiment, at least one oil return structure further includes a second oil return groove assembly, and the second oil return groove assembly is located on the end surface 103 of the mounting portion 101. Preferably, the second oil return groove assembly includes at least one second oil return groove 106, such as Figure 4 or Figure 5 More preferably, the second oil return groove 106 is aligned with the central axis of the through hole 102 , that is, the second oil return groove 106 is on the extension line of the diameter of the through hole 102 .

[0044] According to a preferred embodiment, the second oil return groove 106 extends from the side of the end surface 103 away from the through hole 102 to the side of the end surface 103 close to the through hole 102. That is, the second oil return groove 106 extends from the side of the end surface 103 close to the sector surface 104 to the side of the end surface 103 close to the through hole 102. Figure 4 or Figure 5 shown.

[0045] The preferred technical solution of this embodiment is to set a second oil return groove assembly on the end face 103 of the mounting portion 101, so that the yellow oil stains and impurities attached to the end face 103 can be discharged into the gap formed between the crankshaft 2 and the through hole 102 through the second oil return groove assembly, and then the oil stains and impurities are discharged through the first oil return groove assembly and / or the gap to avoid affecting the heat dissipation and lubrication effect of the compressor.

[0046] The second oil return groove assembly of the preferred technical solution of this embodiment includes at least one second oil return groove 106. Preferably, the second oil return groove assembly includes two or more second oil return grooves 106, and the plurality of second oil return grooves 106 are arranged at intervals from each other. The preferred technical solution of this embodiment includes at least one second oil return groove 106, which can timely discharge the yellow oil scale and impurities generated during the operation of the compressor to prevent them from accumulating on the eccentric sleeve and affecting the heat dissipation and lubrication effect of the compressor.

[0047] According to a preferred embodiment, the second oil return groove 106 is located on the end surface 103 connected to the sector surface 104. The positional relationship between the first oil return groove 105 and the second oil return groove 106 is not limited to Figure 4 and Figure 5 In one case shown, the position of the second oil return groove 106 can also be determined according to the oil return and heat dissipation conditions of the eccentric sleeve.

[0048] According to a preferred embodiment, the depth of the first oil return groove 105 and / or the second oil return groove 106 is 0.1 to 10 mm. Preferably, the depth of the first oil return groove 105 and / or the second oil return groove 106 is 0.1 to 10 mm, so that the yellow oil stains and impurities attached to the through hole 102 and the end surface 103 can be discharged in time, thereby achieving the effect of oil return and heat dissipation.

[0049] According to a preferred embodiment, the cross section of the first oil return groove 105 and / or the second oil return groove 106 is an arc structure or a polygonal structure. Preferably, the cross section of the first oil return groove 105 and / or the second oil return groove 106 is circular, semicircular, elliptical or rectangular, etc., which can achieve the effect of oil return and heat dissipation.

[0050] Example 2

[0051] Combination Figure 6 The oil return device and the scroll compressor of this embodiment are described in detail.

[0052] The oil return device of this embodiment includes at least one oil return structure on the eccentric sleeve of any technical solution of this embodiment. The at least one oil return structure on the eccentric sleeve of this embodiment can make the oil return and lubrication of the matching part of the eccentric sleeve 1, the crankshaft 2 and the bracket assembly 7 smoother, thereby improving the oil return and lubrication effect of the compressor through oil circuit circulation, reducing the adhesion of yellow oil scale, and increasing the service life of the compressor.

[0053] According to a preferred embodiment, the lubrication circuit of the preferred technical solution of this embodiment needs to pass through the following components: Figure 6 As shown, during the operation of the compressor, low-pressure gas enters the suction chamber through the suction port 10 of the suction pipe, and the suction chamber becomes a compression chamber when closed. The compressed high-pressure gas is mixed with lubricating oil, and the lubricating oil enters the high-pressure buffer zone (that is, the front cover assembly 4) through the exhaust port 11, and then passes through the filter screen and the oil-gas separation device on the front cover assembly 4 to filter the lubricating oil, and the high-pressure gas further absorbs the heat dissipated by the motor, and then is output through the exhaust pipe; the filtered lubricating oil passes through the oil holes of the stator assembly 5 and the oil guide plate on the inner wall of the shell to lubricate the dynamic and static plates and the inner cavity of the shell, and then enters the crankshaft 2 and the eccentric sleeve 1 through the oil return groove of the bracket assembly 7 until a lubrication circuit for the entire machine is formed.

[0054] According to a preferred embodiment, in addition to the above-mentioned lubrication circuit, in order to balance the gas force on the movable disk assembly 6, a back pressure chamber is also provided between the movable disk assembly 6 and the bracket assembly 7. The back pressure chamber is connected to the intermediate compression chamber through the back pressure hole on the movable disk assembly 6, so the gas pressure of the back pressure chamber is a certain intermediate pressure lower than the exhaust pressure and higher than the suction pressure. Under the action of this intermediate pressure, the movable scroll always keeps in contact with the fixed scroll along the axial direction, and the axial seal is maintained. Since the refrigerant and oil flow at both ends of the through hole 102 return oil groove is relatively small, an oil return groove is also added on the side to connect with the back pressure chamber (the refrigerant and oil flow is relatively large). Although the high temperature of the eccentric sleeve 1 and the crankshaft 2 with the oil return groove will still turn the oil yellow when rotating at high speed, the refrigeration oil can be better circulated through the oil circuit to prevent more oil stains from adhering to the through hole 102 due to heat dissipation and lubrication. At the same time, some fine impurities will be discharged through the oil circuit to reduce the impurities accumulated at the through hole 102 of the eccentric sleeve 1, making the entire oil circuit and gas circuit smoother, thereby increasing the life of the compressor.

[0055] The scroll compressor of this embodiment includes the oil return device of any technical solution of this embodiment.

[0056] See again Figure 6 The scroll compressor of the preferred technical solution of this embodiment also includes a housing assembly 3 and a rotor assembly 8 and a stator assembly 9 located in the housing assembly 3.

[0057] The scroll compressor of this embodiment improves the lubrication effect of the main components of the compressor (i.e., the dynamic and static scroll plates, brackets, etc.) by optimizing the structure of the eccentric sleeve, reduces the accumulation of impurities and the adhesion of oil stains, improves the oil return path of the whole machine, thereby reducing the wear of parts and increasing the service life of the compressor.

[0058] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An eccentric sleeve, characterized in that: The crankshaft (2) comprises a mounting portion (101), wherein the mounting portion (101) has a through hole (102), the crankshaft (2) is mounted in the through hole (102) and a gap is formed between the crankshaft (2) and the through hole (102), and at least one oil return structure is also provided on the mounting portion (101), and the at least one oil return structure is in communication with the gap; The at least one oil return structure comprises a first oil return groove component, the first oil return groove component is located on the wall surface of the through hole (102) and extends from one end surface of the through hole (102) to the other end surface; The at least one oil return structure further comprises a second oil return groove assembly, wherein the second oil return groove assembly is located on the end surface (103) of the mounting portion (101).

2. The eccentric sleeve according to claim 1, characterized in that: The first oil return groove assembly comprises at least one first oil return groove (105).

3. The eccentric sleeve according to claim 2, characterized in that: It also comprises a sector-shaped surface (104), wherein the sector-shaped surface (104) is located outside the end surface (103) of the mounting portion (101) and is integrally formed with the end surface (103).

4. The eccentric sleeve according to claim 3, characterized in that: The first oil return groove (105) is located on a wall surface of the through hole (102) opposite to the sector surface (104).

5. The eccentric sleeve according to claim 1, characterized in that: The second oil return groove assembly includes at least one second oil return groove (106).

6. The eccentric sleeve according to claim 5, characterized in that: The second oil return groove (106) extends from a side of the end surface (103) away from the through hole (102) to a side of the end surface (103) close to the through hole (102).

7. The eccentric sleeve according to claim 6, characterized in that: The second oil return groove (106) is located on the end surface (103) connected to the sector surface (104).

8. The eccentric sleeve according to claim 5, characterized in that: The depth of the first oil return groove (105) and / or the second oil return groove (106) is 0.1 to 10 mm.

9. The eccentric sleeve according to claim 5, characterized in that: The cross section of the first oil return groove (105) and / or the second oil return groove (106) is one of an arc-shaped structure and a polygonal structure.

10. An oil return device, characterized in that: The invention comprises at least one oil return structure on the eccentric sleeve as claimed in any one of claims 1 to 9.

11. A scroll compressor, characterized in that: Includes the oil return device as described in claim 10.

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