Flanges, pump body components and rotary compressors

Abstract

The present invention provides a flange, a pump body assembly, and a rotary compressor, wherein the flange includes a flange body, the flange body having a through hole penetrating the flange plate and the shaft neck, a flexible annular groove configured on the second end face of the flange body surrounding the opening of the through hole, the flexible annular groove comprising a first annular wall and a second annular wall spaced apart from each other, one of the first annular wall and the second annular wall being an integral structure with the flange body, and the other of the first annular wall and the second annular wall being an assembled structure with the flange body. In the present invention, one of the first annular wall and the second annular wall is connected to the flange body by assembly, and then forms the flexible annular groove together with the other annular wall integrally formed with the flange body. The assembly can form a flexible annular groove of smaller width, without requiring direct machining to form the flexible annular groove of smaller width, effectively reducing the difficulty and cost of machining the flexible annular groove and improving the machining efficiency of the flexible annular groove.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressor manufacturing, and in particular relates to a flange, a pump body assembly and a rotary compressor. Background Art

[0002] The upper and lower flanges of the rotary compressor are the pressure-bearing parts of the crankshaft. The surface pressure they bear directly affects the performance of the oil film and the anti-wear ability of the crankshaft. In the existing related technology, the upper and lower flanges are equipped with a flexible ring groove structure (such as Figure 6 However, under conditions such as liquid hammer or maximum load, the surface at the corresponding position below the flexible ring groove will still be polished, reducing the operational reliability of the compressor shaft system.

[0003] After the flexible ring groove structure is added to the flange, the sealing distance between the flexible ring groove and the roller needs to be considered. When the flexible ring groove width is large, the sealing distance between the flexible ring groove and the roller is small, which affects the performance of the compressor. To increase the sealing distance of the flexible ring groove, the flexible width needs to be reduced. However, due to the limitations of the processing technology, the processing difficulty is high when the flexible ring groove width is small, and the tool is prone to breakage during processing, which affects the processing efficiency and increases the processing cost. Summary of the Invention

[0004] Therefore, the present invention provides a flange, a pump body assembly and a rotary compressor, which can solve the technical problems in the prior art that in order to ensure the sealing distance, the processing of a flexible ring groove with a small width is difficult, the tool is easily broken during processing, and the processing efficiency is reduced and the processing cost is increased.

[0005] In order to solve the above problems, the present invention provides a flange, including a flange body, the flange body having a flange plate and a shaft neck on a first end face of the flange plate, the flange body having a through hole passing through the flange plate and the shaft neck, and a flexible annular groove is constructed around the opening of the through hole on the second end face of the flange body, the flexible annular groove being composed of a first annular wall and a second annular wall spaced apart inside and outside, one of the first annular wall and the second annular wall being an integral structure with the flange body, and the other of the first annular wall and the second annular wall being an assembled structure with the flange body.

[0006] In some embodiments, the radial thickness of the first annular wall is t2, the diameter of the inner circle of the flange of the journal is D, and 0.06D≤t2≤0.17D.

[0007] In some embodiments, a radial width of the annular groove formed between the first annular wall and the second annular wall is t1, and t1≤t2.

[0008] In some embodiments, the first annular wall is a collar, the second annular wall includes a first hole wall segment and a second hole wall segment, the diameter of the first hole wall segment is larger than that of the second hole wall segment and the first hole wall segment is located on the side of the second hole wall segment close to the compression chamber of the compressor, and the collar is assembled in the second hole wall segment.

[0009] In some embodiments, the first annular wall is a sleeve, and the end of the sleeve away from the compression chamber of the compressor has a convex ring extending radially outward, and the convex ring is assembled in the second annular wall or the convex ring is attached to the inner wall surface of the second annular wall.

[0010] In some embodiments, the collar is made of a wear-resistant material.

[0011] In some embodiments, the second annular wall is a collar, and an annular groove is constructed around the opening of the through hole, the opening of the annular groove faces the compression chamber side of the compressor, the first annular wall is the inner groove wall of the annular groove, and the collar is assembled in the outer annular wall of the annular groove.

[0012] In some embodiments, when a second hole wall segment is included, the collar is interference fit with the second hole wall segment; or, the convex ring is interference fit with the second ring wall; or, the collar is interference fit with the outer ring wall of the annular groove.

[0013] The present invention also provides a pump body assembly, comprising an upper flange and a lower flange, at least one of the upper flange and the lower flange being the above-mentioned flange.

[0014] The present invention also provides a rotary compressor comprising the above-mentioned pump body assembly.

[0015] The present invention provides a flange, a pump body assembly and a rotary compressor, in which one of the first ring wall and the second ring wall is connected to the flange body by assembly, and then forms a flexible ring groove together with the other ring wall integrally formed with the flange body. The assembly method can form a flexible ring groove of smaller width, and the flexible ring groove of small width can be directly formed by machining without the need for mechanical machining, which effectively reduces the processing difficulty and processing cost of the flexible ring groove and improves the processing efficiency of the flexible ring groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural schematic diagram (cross-sectional view) of a flange according to an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0018] Figure 3Another structural schematic diagram (cross-sectional view) of a flange according to an embodiment of the present invention;

[0019] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0020] Figure 5 This is a partial enlarged view of another structure of the flange according to an embodiment of the present invention;

[0021] Figure 6 It is a structural diagram of a flange in the prior art;

[0022] Figure 7 is a curve showing the relationship between the performance of the compressor using the flange in the embodiment of the present invention and t1;

[0023] Figure 8 This is a schematic diagram of the internal structure of a pump body assembly according to another embodiment of the present invention.

[0024] The reference numerals indicate:

[0025] 1. Flange body; 11. Shaft neck; 121. First hole wall section; 122. Second hole wall section; 13. Flexible ring groove; 2. Sleeve ring; 21. Protruding ring; 10. Upper flange; 20. Lower flange; 30. Roller. DETAILED DESCRIPTION

[0026] See also Figures 1 to 8 As shown, according to an embodiment of the present invention, a flange is provided, comprising a flange body 1, the flange body 1 having a flange plate and a shaft neck 11 on a first end surface of the flange plate, the flange body 1 having a through hole extending through the flange plate and the shaft neck 11, characterized in that a flexible annular groove 13 is constructed on the second end surface of the flange body 1 surrounding the opening of the through hole, the flexible annular groove 13 being composed of a first annular wall and a second annular wall spaced apart from each other, one of the first annular wall and the second annular wall being an integral structure with the flange body 1, and the other of the first annular wall and the second annular wall being an assembled structure with the flange body 1. In this technical solution, one of the first annular wall and the second annular wall is connected to the flange body 1 by assembly, and then forms the flexible annular groove 13 together with the other annular wall integrally formed with the flange body 1. The assembly can form a flexible annular groove 13 of a smaller width without requiring machining to directly form the flexible annular groove 13, effectively reducing the difficulty and cost of processing the flexible annular groove 13 and improving the processing efficiency of the flexible annular groove 13. It should be noted that, since a flexible annular groove 13 of smaller width may be assembled at the root of the journal 11 , the sealing distance between the flexible annular groove 13 and the roller 30 is effectively increased, thereby reducing leakage and improving compressor performance.

[0027] When the flange inner diameter is large, the thickness of the flexible annular groove 13 (i.e., the radial thickness of the first annular wall) must also be large to effectively function and prevent excessive deformation of the flexible annular groove 13, which could lead to reliability risks of flange and crankshaft wear. Once the flange inner diameter is determined, the thickness of the flexible annular groove 13 falls within an optimal range. Within this range, the surface pressure on the flange inner diameter is not excessive, while deformation of the flexible annular groove 13 is not excessive, thus preventing abnormal wear on the crankshaft and flange, thereby improving reliability. In some embodiments, the radial thickness of the first annular wall is t2, and the flange inner diameter of the journal 11 is D, where 0.06D≤t2≤0.17D.

[0028] Furthermore, the width t1 of the flexible annular groove 13 (that is, the radial width of the annular groove formed between the first annular wall and the second annular wall) and t2 satisfy t1≤t2, thereby realizing a small-width flexible annular groove 13, increasing the sealing distance between the flexible annular groove 13 and the roller 30, and reducing leakage, thereby improving the performance of the compressor. When the thickness of the flexible annular groove 13 is constant, the smaller the width of the flexible annular groove 13, the larger the sealing distance between the flexible annular groove 13 and the roller 30. The relationship curve between different t1 and the COP of the compressor after a certain compressor adopts this solution is shown as follows. Figure 7 : The smaller t1 is, that is, the larger the sealing distance between the flexible ring groove 13 and the roller 30 is, the higher the compressor performance (COP) is. When t1 is small to a certain value, that is, the sealing distance between the flexible ring groove 13 and the roller 30 is large to a certain value, the compressor performance (COP) tends to stabilize and no longer increases.

[0029] In a preferred embodiment, the material of the collar 2 is a wear-resistant material. Especially when the first ring wall is the collar 2, it can further improve the wear problem of the crankshaft and the flange (especially the wear problem of the inner circle root of the flange) and improve the reliability of the compressor.

[0030] As a specific embodiment, refer to Figure 3 and Figure 4 As shown, in some embodiments, the first annular wall is a collar 2, and the second annular wall includes a first hole wall segment 121 and a second hole wall segment 122. The diameter of the first hole wall segment 121 is larger than that of the second hole wall segment 122, and the first hole wall segment 121 is located on the side of the second hole wall segment 122 close to the compression chamber of the compressor (for a roller compressor, that is, the roller 30). That is, on an axial section of the second annular wall, a step shape is formed, and accordingly, a flange step hole is constructed on the flange body 1, as shown in FIG. Figure 3 and Figure 4As shown, the flange stepped hole has a downward opening and a radially inward opening, and the collar 2 is assembled within the second hole wall section 122, thereby forming a seal for the aforementioned radially inward opening. It should be noted that the portion of the second hole wall section 122 protruding from the first hole wall section 121 forms the aforementioned t1. This assembly method can achieve the purpose of processing a small-width groove without considering the difficulty of processing a small-width groove.

[0031] As another specific embodiment, refer to Figure 1 and Figure 2 As shown, the first annular wall is a sleeve 2, and the end of the sleeve 2 away from the compression chamber of the compressor has a convex ring 21 extending radially outward. The convex ring 21 is assembled in the second annular wall or the convex ring 21 is attached to the inner wall surface of the second annular wall. Unlike the aforementioned sleeve 2, the sleeve 2 in this embodiment has a convex ring 21 to form the aforementioned t1. This assembly method does not need to consider the difficulty of processing small-width grooves, and the assembly method can achieve the processing purpose of small-width grooves.

[0032] In another specific embodiment, Figure 5 As shown, the second annular wall is a collar 2, and an annular groove is constructed around the orifice of the through hole. The opening of the annular groove faces the compression chamber side of the compressor. The first annular wall is the inner groove wall of the annular groove, that is, the first annular wall and the flange body 1 are integrally formed. The collar 2 is assembled in the outer annular wall of the annular groove, so that the aforementioned flexible annular groove 13 is formed between the radial inner wall surface of the collar 2 and the outer wall surface of the first annular wall. In this technical solution, a larger annular groove can be machined by mechanical processing, and then the collar 2 can be fitted into the annular groove. This method is similar to the Figures 1 to 4 The two methods shown are different, but can also prevent the processing of a flexible annular groove 13 with a small width, thereby reducing the processing difficulty.

[0033] In a preferred embodiment, there is an interference fit between the collar 2 and the second hole wall section 122; or, there is an interference fit between the convex ring 21 and the second ring wall; or, there is an interference fit between the collar 2 and the outer ring wall of the annular groove. The interference fit is used to achieve a reliable connection between the collar 2 and the flange body 1, and the assembly process is simplified.

[0034] In order to ensure the accuracy of the inner circle and end face of the flange of the present invention, the inner circle and end face processing of the flange are carried out after the flange step hole or annular groove is installed in the ring 2. This can ensure the form and position tolerances and accuracy of the inner circle and large plane of the flange, so that the accuracy level of the inner circle and large plane of the flange of the present invention is comparable to that of existing conventional flanges.

[0035] According to an embodiment of the present invention, Figure 8As shown, a pump body assembly is also provided, including an upper flange 10 and a lower flange 20, at least one of the upper flange 10 and the lower flange 20 is the above-mentioned flange.

[0036] According to an embodiment of the present invention, a rotary compressor is further provided, comprising the above-mentioned pump body assembly.

[0037] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A flange, comprising a flange body (1), wherein the flange body (1) has a flange plate and a shaft neck (11) located on a first end surface of the flange plate, and the flange body (1) has a through hole passing through the flange plate and the shaft neck (11), characterized in that: On the second end face of the flange body (1), a flexible annular groove (13) is constructed around the opening of the through hole. The flexible annular groove (13) is composed of a first annular wall and a second annular wall spaced apart from each other. One of the first annular wall and the second annular wall is an integral structure with the flange body (1), and the other of the first annular wall and the second annular wall is an assembled structure with the flange body (1). The second annular wall is a sleeve (2), and an annular groove is constructed around the opening of the through hole. The opening of the annular groove faces the compression chamber side of the compressor. The first annular wall is the inner groove wall of the annular groove, and the sleeve (2) is assembled in the annular groove. The outer ring wall of the compressor is provided with a collar (2); or, the first ring wall is a collar (2), the second ring wall comprises a first hole wall section (121) and a second hole wall section (122), the diameter of the first hole wall section (121) is larger than that of the second hole wall section (122), and the first hole wall section (121) is located on a side of the second hole wall section (122) close to the compression chamber of the compressor, and the collar (2) is assembled in the second hole wall section (122); or, the first ring wall is a collar (2), and the collar (2) has a convex ring (21) extending radially outward at one end away from the compression chamber of the compressor, and the convex ring (21) is assembled in the second ring wall.

2. The flange according to claim 1, characterized in that The radial thickness of the first annular wall is t2, and the diameter of the flange inner circle of the journal (11) is D, and 0.06D≤t2≤0.17D.

3. The flange according to claim 2, characterized in that The radial width of the annular groove formed between the first annular wall and the second annular wall is t1, and t1≤t2.

4. The flange according to claim 1, wherein: When the second hole wall section (122) is included, there is an interference fit between the collar (2) and the second hole wall section (122); or there is an interference fit between the convex ring (21) and the second ring wall; or there is an interference fit between the collar (2) and the outer ring wall of the annular groove.

5. A pump assembly comprising an upper flange (10) and a lower flange (20), characterized in that: At least one of the upper flange (10) and the lower flange (20) is the flange according to any one of claims 1 to 4.

6. A rotary compressor, characterized in that: Comprising the pump body assembly according to claim 5.

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