Eccentric assembly of electric compressor

Abstract

The utility model relates to an eccentric assembly of an electric compressor, which comprises a crankshaft, a movable scroll plate and an eccentric sleeve assembled in the movable scroll plate, the crankshaft is connected with the eccentric sleeve, the eccentric sleeve is provided with a plurality of pin holes extending along the axial direction of the eccentric sleeve, the eccentric assembly further comprises a plurality of pins, the pins are fixedly connected with the crankshaft and are arranged in parallel with the crankshaft, and the pins are arranged in the pin holes. The pins penetrate through the pin holes respectively and are in clearance fit with the pin holes. The limiting piece can be detachably connected to the pin, the limiting piece is located in a gap between the movable scroll plate and the eccentric sleeve in the length direction of the pin, and the limiting piece abuts against the eccentric sleeve in the direction of the crankshaft. According to the utility model, the limiting piece is arranged on the pin and is used for limiting the eccentric bushing along the axial direction of the pin, so that the eccentric bushing can normally swing around the pin, the eccentric bushing can be prevented from colliding with the movable plate bearing seat, the abrasion of the movable scroll plate is reduced, and the quality of the electric compressor is improved.

Description

Technical Field

[0001] This utility model relates to the field of electric compressor technology, and in particular to an eccentric component of an electric compressor. Background Technology

[0002] A scroll electric compressor is a high-efficiency, compact positive displacement compressor widely used in refrigeration, air conditioning, and heat pump systems. In existing technology, the rotating mechanism of a scroll electric compressor consists of a crankshaft, a motor rotor, an eccentric sleeve, a main bearing, a secondary bearing, a moving disc bearing, a moving scroll, and an anti-rotation mechanism to prevent the moving scroll from rotating on its own. The motor rotor is interference-fitted onto the crankshaft, driving the crankshaft to rotate around its rotation center. The eccentric sleeve is fitted inside the moving scroll. The crankshaft drives the eccentric sleeve to rotate, and the rotation of the eccentric sleeve drives the moving scroll to rotate eccentrically, thereby achieving gas compression. The eccentric sleeve is assembled onto the crankshaft by two pins, with a clearance fit between the eccentric sleeve and the two pins. The eccentric sleeve can make a small-angle arc motion around the pins to correct the thrust angle of the moving scroll.

[0003] Because the eccentric sleeve is fitted onto the pin with a clearance fit, the eccentric sleeve has no axial movement limit. During compressor operation, the eccentric sleeve will move axially along the pin and impact the moving disc bearing seat, causing abnormal wear of the moving disc bearing, damaging the moving scroll, deteriorating the noise performance of the moving scroll, and even reducing the service life of the moving scroll. Summary of the Invention

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem in the prior art where the eccentric sleeve moves along the pin axis and collides with the moving scroll plate, resulting in wear of the moving scroll plate and even a reduction in its service life. In this way, an eccentric component for an electric compressor is provided, in which a limiting member is set on the pin. The limiting member is used to limit the eccentric sleeve along the pin axis, which can not only ensure that the eccentric sleeve swings normally around the pin, but also prevent the eccentric sleeve from colliding with the moving scroll plate bearing seat, thereby reducing the wear of the moving scroll plate and improving the quality of the electric compressor.

[0005] To solve the above-mentioned technical problems, this utility model provides an eccentric assembly for an electric compressor, which includes a crankshaft, a moving scroll, and an eccentric sleeve assembled within the moving scroll. The crankshaft is connected to the eccentric sleeve, and the eccentric sleeve has a plurality of pin holes extending along its axial direction. It also includes...

[0006] Multiple pins are fixedly connected to the crankshaft and are all arranged parallel to the crankshaft. The multiple pins pass through multiple pin holes respectively, and the pins and pin holes are clearance-fitted.

[0007] A limiting member is detachably connected to the pin. The limiting member is located within the gap between the moving scroll plate and the eccentric sleeve along the length direction of the pin, and the limiting member abuts against the eccentric sleeve along the direction of the crankshaft.

[0008] In one embodiment of the present invention, the inner wall of one end of the pin hole expands radially outward to form a receiving groove, and the limiting member is located in the receiving groove.

[0009] In one embodiment of this utility model, the limiting member is provided with a metal ring, the metal ring is coaxially connected with the pin, and the outer diameter of the metal ring is larger than the diameter of the pin hole.

[0010] In one embodiment of this utility model, the metal ring and the receiving groove are in clearance fit.

[0011] In one embodiment of this utility model, the inner hole of the metal ring is interference-fitted with the pin.

[0012] In one embodiment of this utility model, the pin includes a first pin and a second pin, the second pin being smaller in size than the first pin, and the metal ring being coaxially connected to the first pin.

[0013] In one embodiment of this utility model, all of the plurality of pin holes are configured as through holes, and the first pin and the second pin respectively pass through the through holes.

[0014] In one embodiment of the present invention, the pin hole includes a through hole and a blind hole, the first pin passes through the through hole and is clearance-fitted with the through hole; the second pin is inserted into the blind hole and is clearance-fitted with the blind hole.

[0015] In one embodiment of this utility model, the tolerance between the first pin and the pin hole is less than the tolerance between the second pin and the pin hole.

[0016] In one embodiment of this utility model, the moving scroll disk is provided with a moving disk bearing seat, the eccentric sleeve is fitted inside the moving disk bearing seat, and a sliding bearing is provided between the eccentric sleeve and the moving disk bearing seat.

[0017] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0018] The eccentric assembly of the electric compressor described in this utility model restricts the movement of the eccentric sleeve along the axial direction of the pin by setting a limiting member on the pin, preventing the eccentric sleeve from hitting the moving disc bearing seat, thereby reducing the wear of the eccentric sleeve, increasing the service life of the eccentric sleeve, and also reducing the noise of the electric compressor; the limiting member and the pin can be detachably connected, which facilitates the assembly and disassembly of the eccentric sleeve. Attached Figure Description

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a cross-sectional view of the electric compressor in a preferred embodiment of the present invention.

[0021] Figure 2 for Figure 1 An enlarged view of point A shown;

[0022] Figure 3 for Figure 1 The diagram shows the structure of the eccentric sleeve.

[0023] Figure 4 for Figure 3 The cross-sectional view of the eccentric sleeve shown is a structural schematic diagram.

[0024] Figure 5 for Figure 1 A schematic diagram of another embodiment of the eccentric sleeve is shown.

[0025] Explanation of reference numerals in the accompanying drawings: 1. Crankshaft; 2. Moving scroll plate; 21. Moving plate bearing housing; 3. Eccentric sleeve; 31. Through hole; 32. Receiving groove; 33. Blind hole; 34. Through hole; 4. First pin; 41. Second pin; 5. Limiting element; 6. Sliding bearing. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0027] Reference Figure 1 and Figure 2 As shown, in one embodiment of this utility model, an eccentric assembly of an electric compressor is disclosed, which includes a crankshaft 1, a moving scroll 2, and an eccentric sleeve 3 assembled within the moving scroll 2. The crankshaft 1 is connected to the eccentric sleeve 3, and the eccentric sleeve 3 is provided with a plurality of pin holes extending along its axial direction. It also includes...

[0028] Multiple pins are fixedly connected to the crankshaft 1 and are all arranged parallel to the crankshaft 1. The multiple pins pass through multiple pin holes respectively, and the pins and pin holes are clearance-fitted.

[0029] The limiting member 5 is detachably connected to the pin. The limiting member 5 is located in the gap between the moving scroll plate 2 and the eccentric sleeve 3 along the length direction of the pin, and the limiting member 5 abuts against the eccentric sleeve 3 along the direction of the crankshaft 1.

[0030] In this embodiment, the eccentric assembly of the electric compressor operates as follows: when the crankshaft 1 rotates, it drives the eccentric sleeve 3 to rotate. The eccentric sleeve 3 swings around the pin at a certain angle, causing the moving scroll plate 2 to rotate eccentrically. The eccentric sleeve 3 corrects the thrust angle of the moving scroll plate 2, ensuring efficient operation of the compressor. Since a limiting member 5 is provided on the pin, the limiting member 5 limits the eccentric sleeve 3 along the pin axis. When the eccentric sleeve 3 moves along the pin axis, the limiting member 5 abuts against the eccentric sleeve 3 to prevent it from continuing to move and colliding with the scroll plate 2, thereby eliminating the collision between the eccentric sleeve 3 and the moving scroll plate 2, reducing the wear of the moving scroll plate 2, and preventing the compressor noise degradation. The detachable design of the limiting member 5 facilitates assembly and maintenance, reducing maintenance costs.

[0031] In one embodiment of the present invention, the limiting member 5 can be detachably connected to one of the multiple pins.

[0032] Reference Figure 2 As shown, in one embodiment of this utility model, multiple pins are disposed on the end face of the crankshaft 1 so as to assemble the eccentric sleeve 3 to the end of the crankshaft 1. The multiple pins are used to realize a certain amount of swing of the eccentric sleeve 3 and to limit the eccentric sleeve 3 to prevent it from rotating.

[0033] In one embodiment of the present invention, the end face of the crankshaft 1 is provided with a plurality of mounting holes, which extend along the axial direction of the crankshaft 1. The number of mounting holes matches the number of pins. One end of the pin is inserted into the mounting hole, and the pin is interference-fitted with the mounting hole.

[0034] In one embodiment of this utility model, multiple pins have different depths and are used to assemble pins of different lengths.

[0035] In one embodiment of this utility model, a gap is provided between the eccentric sleeve 3 and the limiting member 5 to reduce the friction between the eccentric sleeve 3 and the limiting member 5, ensuring that the eccentric sleeve 3 swings normally. When the eccentric sleeve 3 contacts the limiting member 5, the eccentric sleeve 3 does not collide with the moving scroll plate 2.

[0036] Reference Figure 3 and Figure 4 As shown, in one embodiment of the present invention, the inner wall of one end of the pin hole expands radially to form a receiving groove 32. It can be understood that the receiving groove 32 is connected to the pin hole and the size of the receiving groove 32 is larger than that of the pin hole, so that the limiting member 5 can be assembled in the receiving groove 32, avoiding the limiting member 5 from occupying additional axial space of the pin and maintaining the compactness of the compressor.

[0037] Reference Figure 3 As shown, in one embodiment of this utility model, the receiving groove 32 is configured as a circle.

[0038] Reference Figure 2 As shown, in one embodiment of this utility model, the limiting member 5 is provided with a metal ring, which is coaxially connected to the pin. The high strength of the metal ring can withstand axial impact force and is not easily deformed after long-term use. Moreover, the outer diameter of the metal ring is larger than the diameter of the pin hole, and the eccentric sleeve 3 is limited by the size difference.

[0039] In one embodiment of this utility model, the metal ring and the receiving groove 32 are fitted with a clearance to reduce the friction between the metal ring and the eccentric sleeve 3 and ensure that the eccentric sleeve 3 has a certain degree of freedom of swing.

[0040] In one embodiment of this utility model, the inner hole of the metal ring is interference-fitted with the pin to ensure that there is no relative sliding between the metal ring and the pin during the high-speed rotation of the pin, thereby preventing the metal ring from falling off due to vibration.

[0041] Reference Figure 2 As shown, in one embodiment of this utility model, the plurality of pins include a first pin 4 and a second pin 41. The size of the second pin 41 is smaller than that of the first pin 4. The metal ring is coaxially connected to the first pin 4. The first pin 4 is used to realize a certain amount of oscillation of the eccentric sleeve 3 so that the eccentric sleeve 3 drives the scroll plate 2 to rotate eccentrically. The second pin 41 is used to limit the eccentric sleeve 3 and prevent the eccentric sleeve 3 from rotating around the first pin 4. When the compressor is working, the force on the second pin 41 is less than the force on the first pin 4. Therefore, the size difference between the first pin 4 and the second pin 41 is beneficial to improving the compactness of the eccentric assembly.

[0042] Reference Figure 2 As shown, in one embodiment of this utility model, the diameter and length of the second pin 41 are both smaller than the diameter and length of the first pin 4.

[0043] Reference Figure 5 As shown, in one embodiment of this utility model, the plurality of pin holes are all configured as through holes 31 / 34. The first pin 4 and the second pin 41 pass through the through holes 31 / 34 respectively, and the first pin 4 and the second pin 41 completely pass through the through holes 31 / 34, so that the eccentric sleeve 3 is subjected to force more evenly and it is also convenient to quickly assemble the eccentric sleeve 3.

[0044] Reference Figure 3 and Figure 4As shown, in one embodiment of this utility model, the plurality of pin holes include through holes 31 and blind holes 33. The first pin 4 passes through the through hole 31 and is clearance-fitted with the through hole 31. The second pin 41 is inserted into the blind hole 33 and is clearance-fitted with the blind hole 33. The end face of the second pin 41 forms an axial limit on the end face of the blind hole 33, providing additional constraint on the eccentric sleeve 3 and preventing the eccentric sleeve 3 from moving to one side of the crankshaft 1.

[0045] In one embodiment of this utility model, the tolerance between the first pin 4 and the through hole 31 is less than the tolerance between the second pin 41 and the through hole 34, ensuring that the swing trajectory of the first pin 4 and the eccentric sleeve 3 is accurate and controllable, avoiding the failure of the thrust angle correction of the moving scroll plate 2 due to excessive gap; reducing the requirements for the machining accuracy of the eccentric sleeve 3, simplifying the assembly process, and improving production efficiency.

[0046] Reference Figure 1 As shown, in one embodiment of the present invention, the moving scroll disk 2 is provided with a moving disk bearing seat 21, the eccentric sleeve 3 is assembled in the moving disk bearing seat 21, and a sliding bearing 6 is provided between the eccentric sleeve 3 and the moving disk bearing seat 21.

[0047] In one embodiment of this utility model, the moving disc bearing seat 21 is arranged along the periphery of the eccentric sleeve 3.

[0048] The working principle of the eccentric component of the electric compressor described in this utility model is as follows:

[0049] The eccentric sleeve 3 is simultaneously fitted onto the first pin 4 and the second pin 41 of the crankshaft 1 through the through hole 31 and the blind hole 33, pressing the metal ring onto one end of the first pin 4 and ensuring that the metal ring abuts against one side of the eccentric sleeve 3 along the direction of the crankshaft 1 to prevent axial movement. When the compressor is running, the motor rotor drives the crankshaft 1 to rotate around its rotation center, the crankshaft 1 drives the eccentric sleeve 3 to rotate, and the eccentric sleeve 3 drives the moving scroll 2 to rotate eccentrically. Due to the restriction of the metal ring, the eccentric sleeve 3 can only swing around the first pin 4 to a certain extent and cannot move axially along the first pin 4, thus preventing impact with the moving scroll bearing seat 21, protecting the moving scroll bearing seat 21, improving the service life of the electric compressor and the noise optimization effect.

[0050] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An eccentric assembly for an electric compressor, comprising a crankshaft, a movable scroll, and an eccentric sleeve assembled within the movable scroll, wherein the crankshaft is connected to the eccentric sleeve, and the eccentric sleeve is provided with a plurality of pin holes extending along its axial direction, characterized in that, It also includes, Multiple pins are fixedly connected to the crankshaft and are all arranged parallel to the crankshaft. The multiple pins pass through multiple pin holes respectively, and the pins and pin holes are clearance-fitted. A limiting member is detachably connected to the pin. The limiting member is located within the gap between the moving scroll plate and the eccentric sleeve along the length direction of the pin, and the limiting member abuts against the eccentric sleeve along the direction of the crankshaft.

2. The eccentric assembly of an electric compressor according to claim 1, characterized in that, The inner wall of one end of the pin hole expands radially outward to form a receiving groove, and the limiting member is located in the receiving groove.

3. The eccentric assembly of an electric compressor according to claim 2, characterized in that, The limiting component is provided with a metal ring, which is coaxially connected to the pin, and the outer diameter of the metal ring is larger than the diameter of the pin hole.

4. The eccentric assembly of an electric compressor according to claim 3, characterized in that, The metal ring and the receiving groove are fitted with a clearance.

5. The eccentric assembly of an electric compressor according to claim 3, characterized in that, The inner hole of the metal ring is interference-fitted with the pin.

6. The eccentric assembly of an electric compressor according to claim 3, characterized in that, The pin includes a first pin and a second pin, the second pin being smaller than the first pin, and the metal ring being coaxially connected to the first pin.

7. An eccentric assembly for an electric compressor according to claim 6, characterized in that, All of the plurality of pin holes are configured as through holes, and the first pin and the second pin respectively pass through the through holes.

8. An eccentric assembly for an electric compressor according to claim 6, characterized in that, The pin hole includes a through hole and a blind hole. The first pin passes through the through hole and is clearance-fitted with the through hole. The second pin is inserted into the blind hole and is clearance-fitted with the blind hole.

9. An eccentric assembly for an electric compressor according to claim 6, characterized in that, The tolerance between the first pin and the pin hole is less than the tolerance between the second pin and the pin hole.

10. An eccentric assembly for an electric compressor according to claim 1, characterized in that, The moving scroll disk is provided with a moving disk bearing seat, the eccentric sleeve is fitted inside the moving disk bearing seat, and a sliding bearing is provided between the eccentric sleeve and the moving disk bearing seat.

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