Pump body assembly, compressor and refrigeration device

Abstract

The application provides a pump body assembly, a compressor and a refrigeration device. The pump body assembly comprises a crankshaft, a roller and a limiting connecting rod. The roller is provided with a radial limiting groove and an axial limiting groove. The axial limiting groove is located on the outer circumferential wall of the roller and extends along the axial direction of the roller. The radial limiting groove is located on the first end wall of the roller and extends along the radial direction or the chordal direction of the roller. The eccentric part is provided with a limiting concave hole. The limiting connecting rod comprises an axial limiting rod, a radial limiting rod and a limiting protrusion. The limiting protrusion and the axial limiting rod are respectively located at the two ends of the radial limiting rod. At least a part of the axial limiting rod is located in the axial limiting groove and matched with the axial limiting groove. At least a part of the radial limiting rod is located in the radial limiting groove and matched with the radial limiting groove. At least a part of the limiting protrusion is located in the limiting concave hole and matched with the limiting concave hole. The pump body assembly can reduce the friction loss between the roller, the sliding vane and the cylinder, and can reduce the friction generated by the relative movement between the eccentric part of the crankshaft and the roller.

Description

Technical Field

[0001] This invention relates to the field of compressors, and more specifically, to a pump assembly, a compressor, and a refrigeration device. Background Technology

[0002] Rotary compressors are widely used in the refrigeration industry due to their simple structure, low cost, and good temperature regulation capabilities. In the pump body structure of a rotary compressor, the internal volume of the cylinder is divided into two parts by a crankshaft, rollers, and vanes. When the compressor is working, the eccentric part of the crankshaft drives the rollers to rotate, and the two crescent-shaped chambers of the cylinder are connected to the cylinder intake passage and exhaust passage, respectively, realizing the periodic intake compression and exhaust of the refrigerant.

[0003] The internal volume of the compressor cylinder is divided by the contact between the roller wall surface and the inner cylindrical wall surface of the cylinder, and the sliding vane. During operation, the outer wall surface of the roller experiences sliding friction with the cylinder and the sliding vane, while the inner wall surface of the roller experiences relative movement with the eccentric part of the crankshaft. This causes wear on the pump body parts, increasing the risk of component failure and refrigerant leakage. Summary of the Invention

[0004] The first objective of this invention is to provide a pump body assembly that can reduce frictional losses between rollers, vanes, and cylinders, reduce the increased wear of parts after long-term operation that could lead to compressor failure, and reduce friction generated by the relative movement between the crankshaft eccentric part and the rollers, thereby reducing compressor frictional power loss.

[0005] A second object of the present invention is to provide a compressor employing the pump body assembly described above.

[0006] A third objective of the present invention is to provide a refrigeration device employing the compressor described above.

[0007] To achieve the aforementioned first objective, the present invention provides a pump body assembly, including a crankshaft and rollers. The crankshaft includes a central shaft and an eccentric portion, the eccentric portion being disposed on the central shaft, and the rollers being sleeved outside the eccentric portion. The rollers have radial limiting grooves and axial limiting grooves. The axial limiting groove is located on the outer peripheral wall of the roller and extends along the axial direction of the roller. The radial limiting groove is located on the first end wall of the roller and extends radially or chordally from one end of the axial limiting groove. A limiting recess is formed on the first end wall of the eccentric portion. The pump body assembly further includes a limiting connecting rod, which includes an axial limiting rod, a radial limiting rod, and a limiting protrusion connected together. The limiting protrusion and the axial limiting rod are respectively located at both ends of the radial limiting rod. At least a portion of the axial limiting rod is located within the axial limiting groove and engages with it, at least a portion of the radial limiting rod is located within the radial limiting groove and engages with it, and at least a portion of the limiting protrusion is located within the limiting recess and engages with it.

[0008] As can be seen from the above scheme, the pump body assembly has limiting grooves on the outer peripheral wall and upper end wall of the roller, and a limiting recess of a certain depth is provided on the end wall of the eccentric part of the crankshaft. The roller is connected to the eccentric part of the crankshaft by a limiting connecting rod, thereby reducing frictional losses caused by the relative movement of the roller and the crankshaft. At the same time, the limiting connecting rod can limit the area of ​​contact between the outer peripheral wall of the roller and the inner wall surface of the cylinder and the sliding vane. After the connecting rod component wears out after long-term use, it can be replaced, thereby avoiding the need to replace the entire roller and reducing costs.

[0009] A preferred embodiment is that the axial limiting rod includes a friction wall, which is exposed outside the roller and is arc-shaped and coplanar with the outer peripheral wall of the roller.

[0010] As can be seen, the friction wall and the outer peripheral wall of the roller are coplanar. During the operation of the compressor, after the axial limiting rod is combined with the roller, the friction wall is exposed outside the roller and contacts the inner circular wall of the cylinder, so as to replace the existing sliding friction between the outer circular part of the roller and the inner circular wall of the cylinder. Since the limiting rod is an independent structure, it can be directly replaced after wear.

[0011] A further solution is to provide a wear-resistant layer on the surface of the friction wall.

[0012] Therefore, it can be seen that by using a wear-resistant layer made of a material with a low coefficient of friction, friction loss can be reduced.

[0013] A further option is to use a DLC coating for the wear-resistant layer.

[0014] Therefore, DLC (diamond-like carbon) coating is a surface coating with high hardness, low coefficient of friction and excellent wear resistance, which can enhance the wear resistance of the structure and ensure the formation of a stable oil film.

[0015] A preferred embodiment is that the axial limiting rod further includes a mating wall, which together with the friction wall forms the outer peripheral wall of the axial limiting rod. The cross-section of the mating wall is arc-shaped, and the bending direction of the friction wall is opposite to that of the mating wall.

[0016] Therefore, by designing the mating wall as an arc surface, compared with a straight surface, the area of ​​the force acting along the circumference of the roller during the roller movement is larger, which can effectively avoid force concentration, roller displacement, and wear of parts.

[0017] A preferred embodiment is that a radial oil hole is provided on the central shaft, and the radial oil hole is located near the first end wall of the eccentric part.

[0018] As can be seen, the radial oil hole is located on the end wall of the limiting recess near the eccentric part. During the operation of the compressor, the connection between the limiting connecting rod and the crankshaft can be lubricated, so that the crankshaft and the roller can have a small relative movement, reducing the friction force on the limiting connecting rod in the limiting recess of the crankshaft.

[0019] A preferred embodiment is that the axial limiting groove extends through the roller in the axial direction.

[0020] A preferred embodiment is that the length of the axial limiting rod is equal to the length of the roller, and the first end wall of the radial limiting rod is coplanar with the first end wall of the roller.

[0021] Therefore, on the one hand, it avoids the radial limiting rod from protruding from the first end wall of the roller and interfering with other components; on the other hand, it avoids the limiting link from moving axially due to the axial clearance when the radial limiting protrusion is lower than the first end wall.

[0022] A preferred embodiment is that the limiting protrusion is cylindrical, and the axis of the limiting protrusion is parallel to the extension direction of the axial limiting rod.

[0023] In a preferred embodiment, the limiting protrusion extends from the second end wall of the radial limiting rod toward the first end wall away from the radial limiting rod; and / or the limiting recess is a blind hole; and / or the radial limiting groove extends radially along the roller and radially along the central axis; and / or the limiting link is detachably connected to the roller and the eccentric portion.

[0024] To achieve the second objective described above, the present invention provides a compressor including the pump body assembly described above.

[0025] To achieve the third objective mentioned above, the present invention provides a refrigeration device, including the compressor described above. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of an embodiment of the pump body assembly of the present invention.

[0027] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0028] Figure 3 This is an assembly diagram of the crankshaft, rollers, and limiting connecting rod from a first-view perspective in an embodiment of the pump body assembly of the present invention.

[0029] Figure 4 This is an assembly diagram of the crankshaft, rollers, and limiting connecting rod from a second perspective in an embodiment of the pump body assembly of the present invention.

[0030] Figure 5 This is an axial cross-sectional view of the crankshaft, rollers, and limiting connecting rod in an embodiment of the pump body assembly of the present invention.

[0031] Figure 6 This is a radial cross-sectional view of the crankshaft, rollers, and limiting connecting rod in an embodiment of the pump body assembly of the present invention.

[0032] Figure 7 This is an assembly diagram of the crankshaft and rollers from a first-view perspective in an embodiment of the pump body assembly of the present invention.

[0033] Figure 8 This is an assembly diagram of the crankshaft and rollers from a second perspective in an embodiment of the pump body assembly of the present invention.

[0034] Figure 9 This is an axial cross-sectional view of the crankshaft and rollers in an embodiment of the pump body assembly of the present invention.

[0035] Figure 10 This is a perspective view of the limiting link in an embodiment of the pump body assembly of the present invention.

[0036] Figure 11 This is a front view of the limiting link in an embodiment of the pump body assembly of the present invention.

[0037] Figure 12 This is a top view of the limiting link in an embodiment of the pump body assembly of the present invention.

[0038] Figure 13 This is a bottom view of the limiting link in an embodiment of the pump body assembly of the present invention.

[0039] Figure 14 This is a cross-sectional view of the limiting link in an embodiment of the pump body assembly of the present invention.

[0040] Figure 15 This is a bottom view of the second structure of the limiting link in the embodiment of the pump body assembly of the present invention.

[0041] Figure 16 This is a bottom view of the third structure of the limiting link in the embodiment of the pump body assembly of the present invention.

[0042] Figure 17 This is a bottom view of the fourth structure of the limiting link in the embodiment of the pump body assembly of the present invention.

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0044] Various exemplary embodiments of the invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the invention or its application or use. The invention can be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0045] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, without excluding the possibility of encompassing other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] In this invention, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0047] All terms used in this invention (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0048] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0049] See Figure 1 and Figure 2 In this embodiment, the refrigeration equipment includes a compressor, and the compressor includes a pump assembly.

[0050] The pump assembly includes a cylinder 1, a crankshaft 2, a roller 3, a vane 4, a spring 5, a limiting connecting rod 6, an upper flange 7, and a lower flange 8. The crankshaft 2 includes a central shaft 21 and an eccentric part 22. The eccentric part 22 is mounted on the central shaft 21. The roller 3 is sleeved outside the eccentric part 22 and is located in the cylinder chamber 10 formed by the cylinder 1, the upper flange 7, and the lower flange 8. A vane groove 11 is provided on the peripheral wall of the cylinder 1. The first end of the spring 5 and the vane 4 are located in the vane groove 11. The spring 5 forces the second end of the vane 4 to abut against the roller 3. The vane 4 can move along the vane groove 11. The crankshaft 2 drives the roller 3 to contact the vane 4 and the cylinder 1, dividing the cylinder chamber 10 of the cylinder 1 into two crescent-shaped cavities to complete the refrigerant intake and compression exhaust processes, respectively.

[0051] See Figures 2 to 9 The roller 3 has a radial limiting groove 31 and an axial limiting groove 32. The axial limiting groove 32 is located on the outer peripheral wall of the roller 3 and extends along the axial direction of the roller 3, and the axial limiting groove 32 penetrates the roller 3 in the axial direction. The radial limiting groove 31 is located on the first end wall of the roller 3 and extends radially from one end of the axial limiting groove 32 along the roller 3, and the radial limiting groove 31 extends radially along the central axis 21.

[0052] A limiting recess 221 is formed on the first end wall of the eccentric portion 22. The limiting recess 221 is a blind hole. In this embodiment, the first end wall of the roller 3 is the upper end wall of the roller 3, the second end wall of the roller 3 is the lower end wall of the roller 3, the first end wall of the eccentric portion 22 is the upper end wall of the eccentric portion 22, the first end wall of the radial limiting rod 62 is the upper end wall of the radial limiting rod 62, and the second end wall of the radial limiting rod 62 is the lower end wall of the radial limiting rod 62.

[0053] See Figures 2 to 5 as well as Figures 10 to 14 The limiting link 6 is detachably connected to the roller 3 and the eccentric part 22. The limiting link 6 includes an axial limiting rod 61, a radial limiting rod 62 and a limiting protrusion 63 connected to each other. The limiting protrusion 63 and the axial limiting rod 61 are respectively located at both ends of the radial limiting rod 62. The shape of the axial limiting groove 32 matches the shape of the outer peripheral wall of the axial limiting rod 61. At least a part of the axial limiting rod 61 is located in the axial limiting groove 32 and is clearance-fitted with the axial limiting groove 32. The shape of the radial limiting groove 31 matches the shape of the outer peripheral wall of the radial limiting rod 62. At least a part of the radial limiting rod 62 is located in the radial limiting groove 31 and is clearance-fitted with the radial limiting groove 31 to achieve the limiting of the radial limiting rod 62 relative to the roller 3 in the circumferential direction of the roller 3. The limiting recess 221 and the limiting protrusion 63 are both cylindrical. At least a part of the limiting protrusion 63 is located in the limiting recess 221 and is clearance-fitted with the limiting recess 221.

[0054] The axial limiting rod 61 includes a friction wall 611 and a mating wall 612. The mating wall 612 and the friction wall 611 form the outer peripheral wall of the axial limiting rod 61. The friction wall 611 is exposed outside the roller 3 and is arc-shaped and coplanar with the outer peripheral wall of the roller 3. Preferably, the surface of the friction wall 611 is provided with a wear-resistant layer (not shown). The wear-resistant layer is a DLC coating, but other coatings with high hardness, high wear resistance, and ultra-low coefficient of friction can also be used. The friction wall 611 is coplanar with the outer peripheral wall of the roller 3. During compressor operation, after the axial limiting rod 61 and the roller 3 are combined, the friction wall 611 is exposed outside the roller 3 and contacts the inner circular wall of the cylinder 1, replacing the existing sliding friction between the outer circular area of ​​the roller 3 and the inner circular wall of the cylinder 1. Since this limiting rod 6 is an independent structure, it can be directly replaced after wear. Furthermore, by using a wear-resistant layer made of a low-friction coefficient material, friction loss can be reduced. DLC coating is a surface coating with high hardness, low coefficient of friction and excellent wear resistance, which can enhance the wear resistance of the structure while ensuring the formation of a stable oil film.

[0055] The cross-section of the mating wall 612 is curved, and the bending direction of the mating wall 612 is opposite to that of the friction wall 611. By designing the mating wall 612 as a curved surface, compared with a straight surface, the area of ​​the force acting along the circumference of the roller 3 during the movement of the roller 3 is larger, which can effectively avoid force concentration, causing the roller 3 to deviate and resulting in wear of the parts.

[0056] The length L1 of the axial limiting rod 61 is equal to the length L2 of the roller 3. The first end wall of the radial limiting rod 62 is coplanar with the first end wall of the roller 3, and the lower end wall of the axial limiting rod 61 is coplanar with the second end wall of the roller 3. This prevents the radial limiting rod 62 from protruding beyond the first end wall of the roller 3 and interfering with the upper flange 7, and also prevents the lower end of the axial limiting rod 61 from protruding beyond the second end wall of the roller 3 and interfering with the lower flange 8. Furthermore, it prevents the limiting link 6 from axially shifting due to axial play when the radial limiting protrusion 63 is lower than the first end wall.

[0057] The limiting protrusion 63 is cylindrical and extends from the second end wall of the radial limiting rod 62 toward the first end wall away from the radial limiting rod 62. The axis of the limiting protrusion 63 is parallel to the extension direction of the axial limiting rod 61.

[0058] A radial oil hole 211 and an axial oil hole 212 are provided on the central shaft 21. The axial oil hole 212 extends upward from the lower end wall of the central shaft 21. The radial oil hole 211 communicates with the axial oil hole 212. The lower end of the axial oil hole 212 communicates with the oil sump of the compressor. One of the radial oil holes 211 is located near the first end wall of the eccentric part 22. The radial oil hole 211 is located near the end wall of the eccentric part 22 where a limiting recess 221 is provided. During the operation of the compressor, the connection between the limiting connecting rod 6 and the crankshaft 2 can be lubricated, so that the crankshaft 2 and the roller 3 can have a small relative movement, reducing the friction force on the limiting connecting rod 6 in the limiting recess 221 of the crankshaft 2.

[0059] like Figures 15 to 17 The cross-section of the axial limiting rod 61 can also be roughly fan-shaped, rectangular, or waist-shaped.

[0060] As can be seen from the above scheme, the pump body assembly has limiting grooves on the outer peripheral wall and upper end wall of the roller, and a limiting recess of a certain depth is provided on the end wall of the eccentric part of the crankshaft. The roller is connected to the eccentric part of the crankshaft by a limiting connecting rod, thereby reducing frictional losses caused by the relative movement of the roller and the crankshaft. At the same time, the limiting connecting rod can limit the area of ​​contact between the outer peripheral wall of the roller and the inner wall surface of the cylinder and the sliding vane. After the connecting rod component wears out after long-term use, it can be replaced, thereby avoiding the need to replace the entire roller and reducing costs.

[0061] Furthermore, the radial limiting groove can also extend along the chord of the roller. The axial limiting rod can also be made entirely or only of a wear-resistant material. The axial limiting groove may also not penetrate the roller axially. The shape, size, and position of the limiting protrusion on the radial limiting rod can be changed as needed. The size and shape of the axial limiting rod can also be changed as needed. The radial limiting groove can also be provided on the lower end wall of the roller, while the limiting recess is located on the lower end wall of the eccentric portion. The above modifications can also achieve the purpose of the present invention.

[0062] Finally, it should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pump body assembly, including a crankshaft and rollers, the crankshaft including a central shaft and an eccentric portion, the eccentric portion being disposed on the central shaft, and the rollers being sleeved on the eccentric portion; Its features are: The roller is provided with a radial limiting groove and an axial limiting groove. The axial limiting groove is located on the outer peripheral wall of the roller and extends along the axial direction of the roller. The radial limiting groove is located on the first end wall of the roller and extends from one end of the axial limiting groove along the radial or chordal direction of the roller. A limiting recess is provided on the first end wall of the eccentric part; The pump body assembly also includes a limiting link, which includes an axial limiting rod, a radial limiting rod, and a limiting protrusion connected together. The limiting protrusion and the axial limiting rod are respectively located at both ends of the radial limiting rod. At least a portion of the axial limiting rod is located within the axial limiting groove and engages with the axial limiting groove; at least a portion of the radial limiting rod is located within the radial limiting groove and engages with the radial limiting groove; and at least a portion of the limiting protrusion is located within the limiting recess and engages with the limiting recess. The axial limiting rod includes a friction wall that is exposed outside the roller. The friction wall is arc-shaped and coplanar with the outer peripheral wall of the roller.

2. The pump body assembly according to claim 1, characterized in that: The surface of the friction wall is provided with a wear-resistant layer.

3. The pump body assembly according to claim 1, characterized in that: The axial limiting rod also includes a mating wall, which, together with the friction wall, forms the outer peripheral wall of the axial limiting rod. The cross-section of the mating wall is arc-shaped, and the bending direction of the friction wall is opposite to that of the mating wall.

4. The pump body assembly according to any one of claims 1 to 3, characterized in that: A radial oil hole is provided on the central shaft, and the radial oil hole is located near the first end wall of the eccentric part.

5. The pump body assembly according to any one of claims 1 to 3, characterized in that: The axial limiting groove extends through the roller in the axial direction.

6. The pump body assembly according to any one of claims 1 to 3, characterized in that: The length of the axial limiting rod is equal to the length of the roller, and the first end wall of the radial limiting rod is coplanar with the first end wall of the roller.

7. The pump body assembly according to any one of claims 1 to 3, characterized in that: The limiting protrusion is cylindrical, and the axis of the limiting protrusion is parallel to the extension direction of the axial limiting rod.

8. The pump body assembly according to any one of claims 1 to 3, characterized in that: The limiting protrusion extends from the second end wall of the radial limiting rod in a direction away from the first end wall of the radial limiting rod; and / or The limiting recess is a blind hole; and / or The radial limiting groove extends radially along the roller and radially along the central axis; and / or The limiting link is detachably connected to the roller and the eccentric part.

9. A compressor, characterized in that, Includes the pump body assembly as described in any one of claims 1 to 8.

10. A refrigeration device, characterized in that, Includes the compressor as described in claim 9.

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