Bearing and rotary compressor

Abstract

The invention provides a bearing and a rotary compressor. The bearing comprises a bearing body and a shaft hole, wherein the shaft hole is formed in the center of the bearing body and penetrates through the bearing body; a spiral groove is formed in the inner wall of the shaft hole; a flexible groove is formed in the end face, facing an air cylinder, of the bearing body and surrounds the shaft hole. And the spiral groove is communicated with the flexible groove. The flexible groove of the bearing is communicated with the spiral groove, the through-flow area between the spiral groove and the flexible groove is increased, the backflow influence of an oil hole of a tool withdrawal groove is reduced, the oil pumping amount of the spiral groove is increased, abrasion of the root of a crankshaft is reduced, the efficiency of a compressor is improved, and the service life of the compressor is prolonged.

Description

Technical Field

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

[0002] Some existing compressors have spiral oil outlet grooves on their upper bearings. When a certain model uses the existing upper bearing design, the long shaft root of the crankshaft experiences shaft wear at high speeds, which may be related to the oil output at the contact point between the inner spiral oil outlet groove of the bearing and the upper bearing. When the clearance between the upper bearing, the upper eccentric part and the crankshaft is too small, when the pumping oil is stable, part of the oil in the oil hole of the upper eccentric part is pumped upward to the flexible groove. The oil in the flexible groove is affected by gravity and pressure difference and discharged through a small gap to the upper back-cut groove oil hole and the spiral oil outlet groove, that is, the oil in the upper back-cut groove oil hole will be affected by reflux, resulting in low oil output from the upper spiral oil outlet groove.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to those skilled in the art. Summary of the invention

[0004] In view of the problems in the prior art, the purpose of the present invention is to provide a bearing and a rotary compressor, wherein the bearing is connected to the spiral groove through a flexible groove to increase the flow area between the two, thereby increasing the oil pumping amount of the spiral groove, reducing the wear of the root of the crankshaft, and improving the efficiency and life of the compressor.

[0005] A first aspect of the present invention provides a bearing, comprising a bearing body and an axial hole disposed at the center of the bearing body and penetrating the bearing body;

[0006] The inner wall of the shaft hole is provided with a spiral groove;

[0007] The end surface of the bearing body facing the cylinder is provided with a flexible groove, and the flexible groove is arranged around the shaft hole;

[0008] The spiral groove is communicated with the flexible groove.

[0009] According to the first aspect of the present invention, the axis of the flexible groove coincides with the axis of the shaft hole.

[0010] According to the first aspect of the present invention, an annular groove wall is formed between the flexible groove and the axial hole, and the groove wall is provided with a through hole, through which the spiral groove is connected to the flexible groove.

[0011] According to the first aspect of the present invention, the through hole is provided on a side of the groove wall facing the cylinder.

[0012] According to the first aspect of the present invention, the through hole is not connected to the cylinder on a side close to the cylinder.

[0013] According to the first aspect of the present invention, the through hole is a square hole, the circumferential width of the through hole is W, and the minimum distance from the through hole along the axial direction of the shaft hole to the end surface of the bearing body facing the cylinder is Hs;

[0014] The width of the spiral groove is d, and the depth of the flexible groove along the axial direction of the shaft hole is h, which satisfies:

[0015] The circumferential width W is between 1.5d and 3d; and / or

[0016] The minimum distance Hs<h.

[0017] According to the first aspect of the present invention, the through hole is an arc-shaped hole, and the minimum distance from the lower edge of the through hole along the axial direction of the shaft hole to the end surface of the bearing body facing the cylinder is Hh;

[0018] The depth of the flexible groove along the axial direction of the shaft hole is h, which satisfies:

[0019] The arc angle of the through hole is 30° to 60°;

[0020] The minimum distance Hh<h.

[0021] According to the first aspect of the present invention, the through hole is a circular hole, the diameter of the through hole is D, and the minimum distance from the lower edge of the through hole along the axial direction of the shaft hole to the end surface of the bearing body facing the cylinder is Ha;

[0022] The width of the spiral groove is d, which satisfies:

[0023] The diameter D is between 1d and 2d; and / or

[0024] The minimum distance Ha<h.

[0025] According to the first aspect of the present invention, the through hole is arranged in the spiral groove;

[0026] The minimum distance from the lower edge of the through hole along the axis direction of the shaft hole to the end surface of the bearing body facing the cylinder is H, and the depth of the flexible groove in the axis direction of the shaft hole is h, which satisfies:

[0027] The minimum distance H<h.

[0028] A second aspect of the present invention provides a rotary compressor comprising the bearing described above.

[0029] The flexible groove of the bearing of the present invention is connected to the spiral groove, which increases the flow area between the spiral groove and the flexible groove, reduces the backflow effect of the oil hole of the retreat groove, and then increases the oil pumping amount of the spiral groove, thereby reducing the wear of the root of the crankshaft and improving the efficiency and life of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0031] Figure 1 and Figure 2 are respectively a structural schematic diagram and a cross-sectional diagram of a bearing according to a first embodiment of the present invention;

[0032] Figure 3 It is a schematic cross-sectional view of a through hole in a groove wall according to a first embodiment of the present invention;

[0033] Figure 4 and Figure 5 are respectively a structural schematic diagram and a cross-sectional diagram of a bearing according to a second embodiment of the present invention;

[0034] Figure 6 is a schematic cross-sectional view of a through hole in a groove wall according to a second embodiment of the present invention;

[0035] Figure 7 and Figure 8 are respectively a structural schematic diagram and a cross-sectional diagram of a bearing according to a third embodiment of the present invention;

[0036] Fig. 9 and Fig.10 are respectively a structural schematic diagram and a cross-sectional diagram of a bearing according to a fourth embodiment of the present invention;

[0037] Fig.11 and Fig.12 are respectively a structural schematic diagram and a cross-sectional diagram of a bearing according to a fifth embodiment of the present invention;

[0038] Fig.13 and Fig.14 are respectively a structural schematic diagram and a cross-sectional diagram of a bearing according to a sixth embodiment of the present invention;

[0039] Fig.15 The oil pumping curves of the upper spiral groove of the rotary compressor in a stable cycle are respectively the existing technical solution, the first embodiment and the second embodiment. DETAILED DESCRIPTION

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. Instead, these embodiments are provided so that the present invention will be comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limitations of the present invention. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0041] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the existence of features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0044] In response to the existing technical problems, the present invention provides a bearing and a rotary compressor, wherein the bearing includes a bearing body and an axial hole arranged at the center of the bearing body and passing through the bearing body; the inner wall of the axial hole is provided with a spiral groove; the end surface of the bearing body facing the cylinder is provided with a flexible groove, and the flexible groove is arranged around the axial hole; the spiral groove is connected to the flexible groove.

[0045] The flexible groove of the bearing of the present invention is connected to the spiral groove, which increases the flow area between the spiral groove and the flexible groove, reduces the backflow effect of the oil hole of the retreat groove, and then increases the oil pumping amount of the spiral groove, thereby reducing the wear of the root of the crankshaft and improving the efficiency and life of the compressor.

[0046] The structure of the bearing and the rotary compressor of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the various specific embodiments are not intended to limit the protection scope of the present invention.

[0047] Figure 1 and Figure 2 They are respectively a structural schematic diagram and a cross-sectional diagram of a bearing according to a first embodiment of the present invention. Specifically, the bearing comprises a bearing body 2 and an axial hole 1 arranged at the center of the bearing body 2. The axial hole 1 penetrates the bearing body 2 along the axial direction of the bearing body 2 and is used to pass the crankshaft. The bearing can be an upper bearing or a lower bearing of a compressor pump assembly.

[0048] The inner wall of the shaft hole 1 is provided with a spiral groove 11, that is, when the crankshaft is inserted into the shaft hole, the spiral groove and the outer wall of the crankshaft form a spiral oil channel; the end surface of the bearing body 2 facing the cylinder is provided with a flexible groove 21, and the flexible groove 21 is arranged around the shaft hole 1 to form an annular groove, and an annular groove wall 22 is formed between the flexible groove 21 and the shaft hole 1. Usually, the axis of the flexible groove 21 coincides with the axis XX' of the shaft hole 1, and the side wall of the flexible groove 21 can be set with a certain slope angle, that is, the thickness of the groove wall 22 can be inconsistent in the direction of the axis XX' of the shaft hole 1. More importantly, in the present invention, the spiral groove 11 of the shaft hole is connected with the flexible groove 21 of the bearing body.

[0049] In the first embodiment, the spiral groove 11 is connected to the flexible groove 21 by setting a through hole 3a on the groove wall 22. The through hole 3a can be set on the side of the groove wall 22 facing the cylinder, that is, the through hole 3a is connected to the cylinder on the side close to the cylinder. The through hole 3a is a square hole. It should be noted that the square here means that the groove wall 22 is regarded as a hollow cylinder, and the through hole 3a is obtained by cutting the groove wall 22 with a square in a direction perpendicular to the axis of the hollow cylinder. Figure 3 The schematic cross-sectional view of the through hole 3a in the groove wall 22 of the first embodiment of the present invention is shown in FIG. The circumferential width of the through hole 3a is W, and the minimum distance from the lower edge of the through hole 3a along the axis XX' direction of the shaft hole 1 to the end surface of the bearing body facing the cylinder is Hs; if the width of the spiral groove 11 (the shortest distance between the two sides of the spiral groove) is d, and the depth of the flexible groove 21 along the axis XX' direction of the shaft hole 1 is h, the circumferential width W of the through hole 3a can be between 1.5d and 3d, and the minimum distance Hs of the through hole 3a can be the same as the depth h of the flexible groove 21 along the axis direction of the shaft hole 1. Preferably, the minimum distance Hs is between 0.2h and 0.8h.

[0050] Figure 4 and Figure 5 3 and 4 are respectively a structural schematic diagram and a cross-sectional diagram of a bearing according to a second embodiment of the present invention; different from the first embodiment, the through hole 3b is an arc-shaped hole, Figure 6 This is a schematic cross-sectional view of a through hole 3b in the groove wall 22 of the second embodiment of the present invention. The arc-shaped hole portion corresponds to an arc-shaped segment cut from the groove wall 22. The arc angle β of the through hole 3b is 30° to 60°. In the circumferential direction of the groove wall 22, the circumference of the through hole 3b at least partially covers the circumference of the spiral groove 11.

[0051] In the second embodiment, the through hole 3b is arranged in the middle of the groove wall 22, that is, in the direction of the axis XX' of the shaft hole 1, the depth of the flexible groove 21 in the direction of the axis XX' of the shaft hole 1 is h, and the lower edge of the through hole 3b in the direction of the axis XX' of the shaft hole must be at least at this depth of the flexible groove 21, or in other words, the lower edge of the through hole 3b in the direction of the axis XX' of the shaft hole 1 must be less than h from at least one end surface of the bearing body 2 facing the cylinder. At this time, the through hole 3b and the flexible groove 21 at least partially overlap, so that the two are connected. The side of the through hole 3b close to the cylinder can be unconnected to the cylinder. Through hole 3b centerThe minimum distance between the lower edge of the axis XX' of the shaft hole 1 and the end face of the bearing body 2 facing the cylinder is Hh. The minimum distance Hh of the through hole 3b is less than the depth h of the flexible groove 21 along the axis XX' of the shaft hole 1. Preferably, the minimum distance Hh is between 0.2h and 0.8h. Of course, the through hole 3b can also be arranged on one side of the groove wall 22 as in the first embodiment. Similarly, the through hole 3a in the first embodiment can be arranged in the middle of the groove wall 22. From the manufacturing point of view, the through hole is arranged in the middle of the groove wall 22 to avoid the oil hole of the back cutter groove, so that the oil of the flexible groove is directly discharged from the spiral groove, but the through hole arranged in the middle of the groove wall 22 is difficult to process; the through hole arranged on one side of the groove wall 22 is connected to the spiral groove from the bottom of the flexible groove, which is easy to process. In practice, it can be further determined according to the structure of the compressor bearing and the performance to be achieved.

[0052] Figure 7 and Figure 8 They are respectively a structural schematic diagram and a cross-sectional diagram of a bearing according to the third embodiment of the present invention, wherein the through hole 3c is a circular hole, and the diameter of the through hole 3c is D; if the width of the spiral groove 11 is d, the diameter D of the through hole 3c is between 1d and 2d, and in the circumferential direction of the groove wall 22, the circumference of the through hole 3c at least partially covers the circumference of the spiral groove 11.

[0053] In the third embodiment, the minimum distance between the lower edge of the through hole 3c along the axis XX' direction of the shaft hole 1 and the end surface of the bearing body 2 facing the cylinder is within the range of the depth h of the flexible groove 21, and it is a complete circular hole. Fig. 9 and Fig.10 In the fourth embodiment, the through hole 3d is arranged on the side of the groove wall 22 facing the cylinder, and the through hole 3d is a part of the circular hole. The depth of the flexible groove 21 along the axis XX' direction of the shaft hole 1 is h, and the minimum distance between the lower edge of the through hole 3c along the axis XX' direction of the shaft hole 1 and the end surface of the bearing body 2 facing the cylinder is Ha, and the minimum distance Ha of the through hole 3c is less than the depth h of the flexible groove 21.

[0054] Fig.11 and Fig.12 They are respectively a structural schematic diagram and a cross-sectional diagram of a bearing according to a fifth embodiment of the present invention, wherein the through hole 3e is directly disposed in the spiral groove 11, and the through hole 3e may have the same spiral structure as the spiral groove 11, and the two spirals overlap. Preferably, the through hole 3e is disposed in the middle of the groove wall 22.

[0055] Fig.13 and Fig.14 They are respectively a structural schematic diagram and a cross-sectional diagram of a bearing according to a sixth embodiment of the present invention. Different from the fifth embodiment, the through hole 3f of the sixth embodiment is arranged on the side of the groove wall 22 facing the cylinder.

[0056] In the spiral structure of the through hole, preferably, the minimum distance between the lower edge of the through hole in the direction of the axis XX' of the shaft hole 1 and the end face of the bearing body 2 facing the cylinder is H, and the minimum distance H of the through hole is less than the depth h of the flexible groove in the direction of the axis XX' of the shaft hole 1. Preferably, the minimum distance H is between 0.2h and 0.8h.

[0057] The present invention also provides a rotary compressor, including the bearings described above, wherein the bearings are the upper bearings and / or lower bearings of the compressor. Of course, the compressor may also include components such as cylinders. When the compressor is a multi-cylinder compressor, it also includes multiple cylinders and intermediate plates between adjacent cylinders, which are not described in detail here. After repeated simulation and demonstration using the numerical simulation software Star CCM+, for example, at 5400rpm, the technical solutions of the first and second embodiments of the present invention are compared with the prior art solutions, and the oil output time of the upper spiral groove is accelerated by 5.55% and 17.38%, and the oil output is increased by 18.80% and 28.02%. The second embodiment in which the through hole is in the middle of the groove wall is preferred. In other embodiments of the present invention, it is also shown that the upper spiral groove with the through hole in the middle of the groove wall has a large oil output and a fast oil output speed.

[0058] Fig.15 The oil pumping curves of the upper spiral groove of the rotary compressor in a stable period are respectively the existing technical solution (curve D), the first embodiment (curve B) and the second embodiment (curve A). It can be seen from the figure that the bearing of the present invention has an overall increased average amount of oil pumped in the upper spiral groove compared to the bearing of the prior art. That is, the flexible groove of the bearing of the present invention is connected to the spiral groove, which increases the flow area between the spiral groove and the flexible groove, thereby increasing the amount of oil pumped in the spiral groove. Accordingly, the performance and stability of the compressor will be improved.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0060] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A bearing, characterized in that: It includes a bearing body and an axial hole arranged at the center of the bearing body and passing through the bearing body; The inner wall of the shaft hole is provided with a spiral groove; The end surface of the bearing body facing the cylinder is provided with a flexible groove, and the flexible groove is arranged around the shaft hole; The spiral groove is communicated with the flexible groove.

2. The bearing according to claim 1, characterized in that: The axis of the flexible groove coincides with the axis of the shaft hole.

3. The bearing according to claim 1, characterized in that: An annular groove wall is formed between the flexible groove and the shaft hole, and the groove wall is provided with a through hole, through which the spiral groove is communicated with the flexible groove.

4. The bearing according to claim 3, characterized in that: The through hole is arranged on a side of the groove wall facing the cylinder.

5. The bearing according to claim 3, characterized in that: The through hole is not connected to the cylinder on one side close to the cylinder.

6. The bearing according to claim 3, characterized in that: The through hole is a square hole, the circumferential width of the through hole is W, and the minimum distance from the lower edge of the through hole along the axial direction of the shaft hole to the end surface of the bearing body facing the cylinder is Hs; The width of the spiral groove is d, and the depth of the flexible groove along the axial direction of the shaft hole is h, which satisfies: The circumferential width W is between 1.5d and 3d; and / or The minimum distance Hs<h.

7. The bearing according to claim 3, characterized in that: The through hole is an arc-shaped hole, and the minimum distance from the lower edge of the through hole along the axial direction of the shaft hole to the end surface of the bearing body facing the cylinder is Hh; The depth of the flexible groove along the axial direction of the shaft hole is h, which satisfies: The arc angle of the through hole is 30° to 60°; and / or The minimum distance Hh<h.

8. The bearing according to claim 3, characterized in that: The through hole is a circular hole, the diameter of the through hole is D, and the minimum distance from the through hole along the axis direction of the shaft hole to the end surface of the bearing body facing the cylinder is Ha; The width of the spiral groove is d, which satisfies: The diameter D is between 1d and 2d; and / or The minimum distance Ha<h.

9. The bearing according to claim 3, characterized in that: The through hole is arranged in the spiral groove; The minimum distance from the lower edge of the through hole along the axis direction of the shaft hole to the end surface of the bearing body facing the cylinder is H, and the depth of the flexible groove in the axis direction of the shaft hole is h, which satisfies: The minimum distance H<h.

10. A rotary compressor, characterized in that: A bearing comprising any one of claims 1 to 9.

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