scroll compressor

Abstract

The present invention provides a scroll compressor, comprising a crankshaft assembly, a bracket, and a moving plate on the bracket, wherein the crankshaft assembly comprises an eccentric sleeve, and the eccentric sleeve is arranged on the outside of the bracket and on the side of the bracket away from the moving plate. In the present invention, the eccentric sleeve is improved from being built into the bracket in the prior art to being externally placed outside the bracket, so that the axial size and structural design of the bracket are no longer limited by the axial size and structure of the eccentric sleeve, the axial length of the bracket can be shortened to make the structure of the compressor more compact, and the overall mass of the bracket and the size of the whole machine are reduced. At the same time, the processing depth of the same through hole of the bracket is effectively reduced, which can reduce the processing and manufacturing costs to a certain extent.

Description

Technical Field

[0001] The invention belongs to the technical field of compressor design, and in particular relates to a scroll compressor. Background Art

[0002] The scroll compressor consists of two scroll plates (i.e., a moving plate and a stationary plate) that are staggered 180 degrees apart and compress the refrigerant in translation. During the translation process, the scroll profiles may not always engage or impurities may enter, which will cause problems such as poor performance or reduced reliability. Therefore, an eccentric sleeve (i.e., an eccentric structure) is required to change the rotation radius of the moving plate to cope with complex operating conditions. At the same time, the eccentric sleeve also plays a certain role in balancing the torque, but the axial distance of the eccentric sleeve is long. This eccentric sleeve placed inside the bracket will cause the bracket (generally called the upper bracket) to be longer. On the one hand, this leads to a larger axial length and mass of the bracket and a less compact structure. On the other hand, it requires processing a deeper eccentric sleeve hole, which increases the processing cost. Summary of the Invention

[0003] Therefore, the present invention provides a scroll compressor that can solve the technical problems in the prior art of using an eccentric sleeve with an alignment structure built into the bracket, which results in a large bracket shaft length and mass, and a deep eccentric sleeve hole and high processing cost.

[0004] In order to solve the above problems, the present invention provides a scroll compressor, including a crankshaft assembly, a bracket and a moving plate on the bracket, the crankshaft assembly includes an eccentric sleeve, and the eccentric sleeve is arranged on the outside of the bracket and on the side of the bracket away from the moving plate.

[0005] In some embodiments, the crankshaft assembly further includes a first shaft segment and a second shaft segment, the first end face of the first shaft segment having a crank, the first end of the second shaft segment being fixedly connected to the first shaft segment via the crank, the eccentric sleeve being located between the first shaft segment and the second shaft segment, the eccentric sleeve being rotatably sleeved on the crank, and the movement of the eccentric sleeve being limited by a limiting structure, the eccentric sleeve having an eccentric rod passing through and protruding from the second end of the second shaft segment, the eccentric rod being capable of driving the translational movement of the moving plate, and the second shaft segment being rotatably connected to the bracket.

[0006] In some embodiments, an eccentric ring is mounted on the outer circumferential wall of the eccentric rod, and the eccentric rod drives the translation of the movable plate through the eccentric ring; and / or, a crank hole is provided on the first end of the second shaft segment, and the crank is interference fit with the crank hole.

[0007] In some embodiments, the limiting structure includes a pin hole constructed on the first end of the first shaft segment, a pin limiting groove constructed on one end of the eccentric sleeve facing the first shaft segment, and a pin, one end of the pin is inserted into the pin hole, and the other end of the pin is inserted into the pin limiting groove.

[0008] In some embodiments, the limiting structure includes an eccentric hole constructed on the second shaft segment and passing through both axial ends thereof. The eccentric hole forms a movable limit for the eccentric sleeve through the outer circumferential wall of the eccentric rod through changes in the hole wall profile.

[0009] In some embodiments, the limiting structure includes a limiting protrusion provided on the side of the eccentric sleeve facing the first shaft segment, and the limiting protrusion forms a movable limit on the eccentric sleeve through the change of the outer circumferential wall profile facing the first shaft segment and the outer circumferential wall of the first shaft segment.

[0010] In some embodiments, the eccentric sleeve further has an eccentric mass portion.

[0011] In some embodiments, the eccentric mass portion is an eccentric plate connected to the eccentric rod as a whole, and the eccentric plate has an air supply structure, which can send the air flow near it to multiple flow holes on the bracket, and the flow holes are connected to the suction chamber of the scroll compressor.

[0012] In some embodiments, the air supply structure includes a plurality of blades arranged at intervals.

[0013] In some embodiments, a plurality of airflow channels are configured on the eccentric plate, and each of the airflow channels is provided at a root of each of the blades.

[0014] The present invention provides a scroll compressor in which the eccentric sleeve is improved from being built into the bracket in the prior art to being placed outside the bracket, so that the axial size and structural design of the bracket are no longer limited by the axial size and structure of the eccentric sleeve. The axial length of the bracket can be shortened to make the structure of the compressor more compact, and the overall mass of the bracket and the size of the whole machine are reduced. At the same time, the processing depth of the same through hole of the bracket is effectively reduced, which can reduce the processing and manufacturing costs to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the internal structure of a scroll compressor according to an embodiment of the present invention;

[0016] Figure 2 for Figure 1 A schematic structural diagram of the first shaft segment in FIG.

[0017] Figure 3 for Figure 1Schematic diagram of the structure of the eccentric sleeve;

[0018] Figure 4 for Figure 1 A schematic structural diagram of the second shaft segment in FIG.

[0019] Figure 5 A schematic diagram of state changes of a limiting structure according to an embodiment of the present invention;

[0020] Figure 6 A schematic diagram of state changes of a limiting structure according to another embodiment of the present invention;

[0021] Figure 7 A schematic diagram of state changes of a limiting structure according to another embodiment of the present invention;

[0022] Figure 8 for Figure 7 A schematic structural diagram of the limiting structure in FIG.

[0023] Figure 9 is a schematic diagram of the three-dimensional structure of an eccentric sleeve in another embodiment of the present invention;

[0024] Figure 10 This is a comparison chart of the changes in bracket size and axial length between the technical solution of the present invention and the technical solution of the prior art.

[0025] The reference numerals indicate:

[0026] 11. First shaft section; 111. Crank; 112. Pin hole; 12. Eccentric sleeve; 121. Eccentric rod; 122. Eccentric ring; 123. Pin limiting groove; 124. Eccentric mass portion; 125. Blade; 126. Air flow channel; 127. Crank through hole; 13. Second shaft section; 131. Crank hole; 132. Eccentric hole; 21. Moving plate; 22. Static plate; 23. Motor assembly; 24. Main bearing; 3. Bracket; 31. Through hole; 41. Pin; 42. Limiting protrusion. DETAILED DESCRIPTION

[0027] See also Figures 1 to 10As shown, according to an embodiment of the present invention, a scroll compressor is provided, comprising a moving plate 21 and a stator plate 22 that are 180° opposite to each other, a crankshaft assembly, and a bracket 3, wherein the moving plate 21 is located on the bracket 3, the crankshaft assembly is driven to rotate by the motor assembly 23 to drive the moving plate 21 to translate relative to the stator plate 22 to compress the gas, and the crankshaft assembly comprises an eccentric sleeve 12, which is arranged on the outside of the bracket 3 and is located on the side of the bracket 3 away from the moving plate 21. In this technical solution, the eccentric sleeve 12 is improved from being built into the bracket 3 in the prior art to being externally located outside the bracket 3, so that the axial size and structural design of the bracket 3 are no longer limited by the axial size and structure of the eccentric sleeve 12, the axial length of the bracket 3 can be shortened to make the structure of the compressor more compact, and the overall mass and overall size of the bracket 3 are reduced. At the same time, the processing depth of the same through hole of the bracket 3 is effectively reduced, which can reduce the processing and manufacturing costs to a certain extent.

[0028] In a specific embodiment, the crankshaft assembly further includes a first shaft segment 11 and a second shaft segment 13. The first end face of the first shaft segment 11 includes a crank 111. The first end of the second shaft segment 13 is fixedly connected to the first shaft segment 11 via the crank 111. The eccentric sleeve 12 is located between the first shaft segment 11 and the second shaft segment 13. The eccentric sleeve 12 is rotatably sleeved (via a crank through hole 127 on the eccentric sleeve 12) on the crank 111, and the movement of the eccentric sleeve 12 is limited by a limiting structure (not labeled in the figure). The eccentric sleeve 12 has an eccentric rod 121 that passes through and protrudes from the second end of the second shaft segment 13. The eccentric rod 121 can drive the translation of the movable plate 21. The second shaft segment 13 is rotatably connected to the bracket 3. In this technical solution, the first shaft segment 11 and the second shaft segment 13 assembled in sections form a rotatable connection to the eccentric sleeve 12, and the structure is reliable and stable.

[0029] It is understood that the aforementioned eccentric rod 121 can have a larger diameter so that it can be sleeved with the main bearing 24 and thus achieve translational drive of the movable plate 21. However, an eccentric rod 121 with a larger diameter has the disadvantage of being less convenient to assemble. Therefore, in a preferred embodiment, an eccentric ring 122 is sleeved on the outer circumferential wall of the eccentric rod 121. The eccentric rod 121 drives the translation of the movable plate 21 via the eccentric ring 122. In this way, the diameter of the eccentric rod 121 can be designed to be relatively small, which can facilitate its assembly with the bracket 3. A crank hole 131 is defined at the first end of the second shaft segment 13. The crank 111 and the crank hole 131 are interference fit. The use of an interference fit can reduce the number of connecting parts between the two components and reduce the number of failure points.

[0030] In a specific embodiment, see Figure 2 and Figure 3As shown, the limiting structure includes a pin hole 112 constructed on the first end of the first shaft segment 11, a pin limiting groove 123 constructed on the end of the eccentric sleeve 12 facing the first shaft segment 11, and a pin 41. One end of the pin 41 is inserted into the pin hole 112, and the other end of the pin 41 is inserted into the pin limiting groove 123. Figure 5 As shown, the pin limiting groove 123 extends along an arc direction and has a certain arc length to form a limiting angle. The two ends of the arc length limit the pin 41. The limiting structure of the pin 41 is adopted, and the limiting angle is selected by selecting the arc length. It is simple and convenient to manufacture, but the rigidity is relatively low, which is particularly suitable for working conditions with low speed.

[0031] See also Figure 6 As shown, in another specific embodiment, the limiting structure includes an eccentric hole 132 constructed on the second shaft segment 13 and passing through both axial ends thereof. The eccentric hole 132 forms a movable limit on the eccentric sleeve 12 through the change of its hole wall profile and the outer circumferential wall of the eccentric rod 121. The limiting angle is controlled by controlling the shape, position and size of the eccentric hole 132. The eccentric hole 132 can be made into various shapes, such as ellipse, rectangle, etc.

[0032] See also Figure 7 and Figure 8 As shown, in another specific embodiment, the limiting structure includes a limiting protrusion 42 provided on the side of the eccentric sleeve 12 facing the first shaft segment 11. The limiting protrusion 42 forms a movable limit for the eccentric sleeve 12 by changing the profile of its outer peripheral wall facing the first shaft segment 11 and the outer peripheral wall of the first shaft segment 11. The limiting protrusion 42 can be in various shapes such as an ellipse or a large arc. After rotating to a certain angle, it forms a limit between the outer peripheral wall of the first shaft segment 11, thereby controlling the eccentric angle. This limiting structure has good rigidity, but increases weight and requires high processing precision.

[0033] See also Figure 3 As shown, the eccentric sleeve 12 also has an eccentric mass portion 124, which is placed on the outside of the bracket 3. It can be optimized according to the axial balance requirements, so that the eccentric sleeve 12 plays the role of a shaft balance block, balances the overturning moment and improves the operating reliability of the compressor. More importantly, since the eccentric mass portion 124 is placed outside the bracket 3, its size and shape can be designed more flexibly according to requirements, and is no longer limited by the size and structure of the bracket 3. In a preferred embodiment, the eccentric mass portion 124 is an eccentric plate extending radially along the first shaft segment 11, and the eccentric plate is connected to the eccentric rod 121 as a whole, that is, it is integrally formed. Such a design can make the eccentric sleeve 12 not occupy any size in the axial direction of the first shaft segment 11, thereby reducing the axial size of the entire compressor.

[0034] See Figure 9As shown, the eccentric plate has an air supply structure, which can deliver the airflow near it to the multiple through-holes 31 on the bracket 3. The through-holes 31 are connected to the suction chamber of the scroll compressor, so that while achieving the centering effect of the eccentric sleeve 12, it also has the effect of increasing the suction volume of the compressor. Specifically, the air supply structure includes a plurality of blades 125 arranged at intervals. Of course, the shape of the blades 125 can be various, such as semi-scroll shape, fan blade shape, etc. When the crankshaft assembly is driven to rotate, the refrigerant is driven by the air supply structure, and the air supply structure stirs the refrigerant like a fan, increases the flow speed of the refrigerant, and enters the suction chamber from the through-holes 31 of the bracket 3, increases the suction volume, and thus improves the performance of the compressor.

[0035] In a preferred embodiment, a plurality of air flow channels 126 are constructed on the eccentric plate, and each air flow channel 126 is provided at the root of each blade 125 to ensure smooth flow of the refrigerant air flow.

[0036] 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.

[0037] 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 scroll compressor, characterized in that: The invention comprises a crankshaft assembly, a bracket (3) and a movable plate (21) on the bracket (3), wherein the crankshaft assembly comprises an eccentric sleeve (12), the eccentric sleeve (12) being arranged on the outside of the bracket (3) and being located on the side of the bracket (3) away from the movable plate (21); the crankshaft assembly further comprises a first shaft section (11) and a second shaft section (13), the first end face of the first shaft section (11) being provided with a crank (111), the first end of the second shaft section (13) being connected to the first shaft section via the crank (111). (11) is fixedly connected, the eccentric sleeve (12) is located between the first shaft section (11) and the second shaft section (13), the eccentric sleeve (12) is rotatably sleeved on the crank (111), and the movement of the eccentric sleeve (12) is limited by a limiting structure, the eccentric sleeve (12) has an eccentric rod (121) passing through and protruding from the second end of the second shaft section (13), the eccentric rod (121) can drive the translation of the moving disk (21), and the second shaft section (13) is rotatably connected to the bracket (3).

2. The scroll compressor according to claim 1, wherein: An eccentric ring (122) is sleeved on the outer circumferential wall of the eccentric rod (121), and the eccentric rod (121) drives the translation of the movable disc (21) through the eccentric ring (122); and / or, a crank hole (131) is provided on the first end of the second shaft segment (13), and the crank (111) is interference-fitted with the crank hole (131).

3. The scroll compressor according to claim 1, wherein: The limiting structure includes a pin hole (112) constructed on the first end of the first shaft segment (11), a pin limiting groove (123) constructed on one end of the eccentric sleeve (12) facing the first shaft segment (11), and a pin (41), one end of the pin (41) is inserted into the pin hole (112), and the other end of the pin (41) is inserted into the pin limiting groove (123).

4. The scroll compressor according to claim 1, wherein The limiting structure comprises an eccentric hole (132) constructed on the second shaft segment (13) and penetrating through both axial ends thereof; the eccentric hole (132) forms a movable limit for the eccentric sleeve (12) by changing the profile of its hole wall and the outer circumferential wall of the eccentric rod (121).

5. The scroll compressor according to claim 1, wherein: The limiting structure comprises a limiting protrusion (42) provided on the side of the eccentric sleeve (12) facing the first shaft segment (11); the limiting protrusion (42) forms a movable limit for the eccentric sleeve (12) by changing the profile of its outer peripheral wall facing the first shaft segment (11) and the outer peripheral wall of the first shaft segment (11).

6. The scroll compressor according to claim 1, wherein: The eccentric sleeve (12) further comprises an eccentric mass portion (124).

7. The scroll compressor according to claim 6, characterized in that The eccentric mass portion (124) is an eccentric plate integrally connected to the eccentric rod (121), and the eccentric plate has an air supply structure, which can deliver the airflow near the eccentric mass portion to a plurality of through-holes (31) on the bracket (3), and the through-holes (31) are connected to the suction chamber of the scroll compressor.

8. The scroll compressor according to claim 7, wherein: The air supply structure includes a plurality of blades (125) arranged at intervals.

9. The scroll compressor according to claim 8, wherein: A plurality of airflow channels (126) are constructed on the eccentric plate, and each of the airflow channels (126) is arranged at the root of each of the blades (125).

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