Expansion device of variable capacity compressor

Abstract

The invention relates to the technical field of compressor expansion devices, in particular to an expansion device of a variable-capacity compressor, which comprises a valve body communicated with an air outlet pipe and fixedly connected to an air inlet pipe; the end cover is mounted on the valve body; the operating mechanism is arranged in the valve body and comprises an air inlet and a moving ring, the air inlet is formed in the valve body, the moving ring is slidably connected into the valve body, a stabilizing column is fixedly connected to the moving ring in a penetrating mode, a sealing plug is fixedly connected to the stabilizing column, and the sealing plug is located in the air inlet. Through cooperation of a second spring, a first sliding block, a tooth block, a tooth plate, a sliding column and the like, the elasticity of the first spring is conveniently adjusted, cooperation of the first spring, a top block, a stabilizing column, a sealing plug and the like is facilitated, pressure adjustment is achieved, stability is improved, meanwhile, through cooperation of a supporting frame, a first pull rope, a second pull rope and the like, the sliding column in the end cover is conveniently taken out, and use is convenient. And people can replace the first spring conveniently, people can maintain the device conveniently, and practicability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of compressor expansion devices, in particular to an expansion device of a variable capacity compressor. Background Art

[0002] The refrigeration system is composed of four major components: compressor, compressor expansion device, condenser, and evaporator. The compressor expansion device is an important component in the refrigeration system and is generally installed between the liquid storage cylinder and the evaporator.

[0003] After searching, the utility model patent with Chinese patent publication (announcement) number CN211204525U discloses a pressure-adjustable compressor expansion valve, which is roughly described as comprising a valve body, a processing tank is opened in the valve body, a piston is movably installed in the processing tank, and an end cover is fixedly installed on the upper end of the valve body. When in use, a pressure regulating device is installed between the end cover and the piston, and the distance between the first movable plate and the second movable plate is reduced by rotating the threaded rod, the spring is compressed, and the elastic force contained in the spring is increased, so that a larger air pressure is required inside to lift the piston, so as to control the internal pressure demand. However, the above device still has certain shortcomings, such as the threaded rod and the bearing in the above device. After the rotation and adjustment of the threaded tube, the above device is not convenient for limiting the threaded rod, bearing and threaded tube. Under the elastic force of the spring, the second movable plate, threaded tube, etc. will be affected by the elastic force of the spring. When used for a long time, the second movable plate may be pushed to move, thereby causing the bearing and the threaded rod to rotate, resulting in unstable pressure regulation. Moreover, after the spring has been adjusted many times and used for a period of time, the elastic force will weaken and decay, which will also have a certain impact on the pressure regulation. The above device is not convenient for replacing the spring during maintenance, which makes maintenance difficult, increases the cost of use, and has certain shortcomings in practicality. For this reason, we propose an expansion device for a variable capacity compressor. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides an expansion device for a variable capacity compressor to solve the problem in the prior art that after the threaded rod, bearing and threaded tube are rotated and adjusted, the above-mentioned device is not convenient for limiting the threaded rod, bearing and threaded tube, and under the elastic force of the spring, the second movable plate, the threaded tube, etc. will be affected by the elastic force of the spring. When used for a long time, the second movable plate may be pushed to move, thereby causing the bearing and the threaded rod to rotate, resulting in unstable pressure regulation. Moreover, after the spring has been adjusted many times and used for a period of time, the elastic force will weaken and decay, which will also have a certain impact on the pressure regulation. The above-mentioned device is not convenient for replacing the spring during maintenance, which makes maintenance difficult, increases the cost of use, and has certain deficiencies in practicality.

[0006] (II) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solution: an expansion device of a variable capacity compressor, comprising:

[0008] A valve body, wherein the valve body is connected to an air outlet pipe and the valve body is fixedly connected to the air inlet pipe;

[0009] An end cover, wherein the end cover is mounted on the valve body;

[0010] An operating mechanism, the operating mechanism is arranged in the valve body, the operating mechanism includes an air inlet and a moving ring, the air inlet is opened on the valve body, the moving ring is slidably connected in the valve body, a stabilizing column is passed through and fixedly connected to the moving ring, a sealing plug is fixedly connected to the stabilizing column, the sealing plug is located in the air inlet, and the stabilizing column extends into the end cover for sealing, air intake and air outlet;

[0011] The adjusting mechanism is arranged on the end cover, and the adjusting mechanism comprises a top block, a sliding column and a support frame. The top block is fixedly connected to the stabilizing column, the sliding column is slidably connected in the end cover, and the support frame is fixedly connected to the end cover. A spring is arranged between the top block and the sliding column. Two grooves are arranged on the support frame, and a tooth plate is fixedly connected in the groove. A lifting tube is fixedly connected to the sliding column, and the lifting tube passes through the support frame. A wire hole and two slide grooves are arranged on the sliding column, and the wire hole and the two slide grooves are connected. The two slides are connected, a slider 1 is slidably connected in the slide groove 1, a tooth block is fixedly connected on the slider 1, the tooth block is meshed with the tooth plate, a spring 2 is arranged between the slider 1 and the slide groove 1, a pull rope 1 is fixedly connected between the two sliders 1, the pull rope 1 is located in the wire hole, a pull rope 2 is fixedly connected on the pull rope 1, the pull rope 2 passes through the wire outlet hole and extends into the lifting tube, a lifting rod is slidably connected in the lifting tube, the lifting rod is fixedly connected to the pull rope 2, and a pull block is fixedly connected on the lifting rod for pressure adjustment;

[0012] The auxiliary mechanism is arranged on the moving ring and is used for playing a buffering role.

[0013] Preferably, the auxiliary mechanism includes four mounting plates, each of which is detachably connected to the movable ring by two bolts, a slide cylinder is fixedly connected to the mounting plate, a slide rod is slidably connected inside the slide cylinder, a buffer spring is arranged between the slide cylinder and the slide rod, and a fixed seat is fixedly connected to the slide rod for buffering and protecting the slide rod.

[0014] Furthermore, a sealing groove is provided on the movable ring, and a sealing ring is arranged in the sealing groove.

[0015] Furthermore, a threaded ring is rotatably connected to the end cover, an external thread is provided on the valve body, and the threaded ring is threadably connected to the valve body via the external thread.

[0016] Furthermore, a limiting opening is provided on the threaded ring, a sliding groove 2 is provided on the end cover, a slider 2 is slidably connected in the sliding groove 2, a limiting block is fixedly connected to the slider 2, the limiting block is located in the limiting opening, a threaded rod is rotatably connected in the sliding groove 2, the slider 2 is threadedly connected to the threaded rod, the threaded rod passes through the sliding groove 2 and is fixedly connected to an adjusting button.

[0017] On the basis of the above-mentioned solution, two guide shafts are fixedly connected in the second slide groove, and the second slider is slidably connected to the two guide shafts.

[0018] Preferably, based on the above solution, two guide grooves are provided in the end cover, and two guide blocks are fixedly connected to the sliding column, and the guide blocks are located in the guide grooves.

[0019] Further on the basis of the above solution, a buffer pad is fixedly connected to the fixing seat.

[0020] Further on the basis of the above scheme, a stabilizing ring is fixedly connected to the end cover, the stabilizing column penetrates and is slidably connected to the stabilizing ring, and the stabilizing ring is located in the valve body.

[0021] Further on the basis of the above solution, the threaded ring is provided with anti-slip grooves.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the present invention provides an expansion device for a variable capacity compressor, which has the following beneficial effects:

[0024] 1. The expansion device of the variable capacity compressor is convenient for adjusting the elastic force of the spring one through the cooperation of the spring two, the slider one, the tooth block, the tooth plate, the sliding column, etc., and is convenient for the cooperation of the spring one, the top block, the stabilizing column, the sealing plug, etc. to achieve pressure regulation and improve stability. At the same time, through the cooperation of the support frame, the pull rope one, the pull rope two, etc., it is convenient to take out the sliding column in the end cover, which is convenient for people to replace the spring one, facilitate people to carry out maintenance, and improve practicality.

[0025] 2. The expansion device of the variable capacity compressor avoids a large direct collision between the sealing plug and the air inlet through the cooperation of a buffer spring, a slide cylinder, a slide rod, etc., which can play a certain buffering effect and a certain protective role, thereby increasing the service life. The cooperation of a threaded ring, a limit block, a threaded rod, etc. makes it easy to separate the valve body and the end cover, and facilitates people to maintain and replace the moving ring, the mounting plate, the sealing plug, etc., thereby improving practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the three-dimensional structure of this application;

[0027] Figure 2 This is a schematic diagram of the three-dimensional structure of the present application from a side view;

[0028] Figure 3 It is a schematic diagram of a partially cutaway three-dimensional structure of the present application;

[0029] Figure 4 This is a schematic diagram of the three-dimensional structure of the end cover, support frame, spring, etc. of this application;

[0030] Figure 5 This is a schematic diagram of the three-dimensional structure of the support frame, tooth plate, etc. of this application;

[0031] Figure 6 This is a schematic diagram of the three-dimensional structure of the sealing plug, movable ring, etc. of the present application;

[0032] Figure 7 This is a schematic diagram of the three-dimensional structure of the sealing ring, stabilizing column, etc. of this application;

[0033] Figure 8 This is a schematic diagram of the three-dimensional structure of the slide bar, buffer spring, etc. of the present application;

[0034] Fig. 9 A schematic diagram of the three-dimensional structure of the end cap, stabilizing ring, etc. of this application;

[0035] Fig.10 For this application Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0036] Fig.11 For this application Figure 3 A schematic diagram of the local enlarged structure at B in the middle;

[0037] Fig.12 For this application Figure 5 A schematic diagram of the local enlarged structure at C in the middle;

[0038] Fig.13 For this application Figure 5 A schematic diagram of the local enlarged structure at D in the middle;

[0039] Fig.14 For this application Figure 8 A schematic diagram of the local enlarged structure at E in the middle;

[0040] Fig.15 For this application Fig. 9 Schematic diagram of the local enlarged structure at F in the middle.

[0041] In the figure: 1. valve body; 2. air inlet pipe; 3. air outlet pipe; 4. end cover; 5. moving ring; 6. stabilizing column; 7. sealing plug; 8. top block; 9. sliding column; 10. supporting frame; 11. spring one; 12. tooth plate; 13. lifting tube; 14. wire hole; 15. slider one; 16. tooth block; 17. spring two; 18. pull rope one; 19. pull rope two; 20. lifting rod; 21. pull block; 22. mounting plate; 23. slide cylinder; 24. slide rod; 25. buffer spring; 26. fixing seat; 27. sealing ring; 28. threaded ring; 29. ​​slider two; 30. limit block; 31. threaded rod; 32. adjusting button; 33. guide shaft; 34. guide block; 35. buffer pad; 36. stabilizing ring; 37. anti-slip pattern DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Example

[0044] See also Figure 1-Figure 15 , an expansion device of a variable capacity compressor, comprising:

[0045] A valve body 1, the valve body 1 is connected with an air outlet pipe 3, and the valve body 1 is fixedly connected to the air inlet pipe 2;

[0046] An end cover 4 is mounted on the valve body 1;

[0047] The operating mechanism is arranged in the valve body 1, and the operating mechanism includes an air inlet and a moving ring 5. The air inlet is provided on the valve body 1, and the moving ring 5 is slidably connected in the valve body 1. A stabilizing column 6 is fixedly connected through the moving ring 5, and a sealing plug 7 is fixedly connected to the stabilizing column 6. The sealing plug 7 is located in the air inlet, and the stabilizing column 6 extends into the end cover 4. The moving ring 5 is used to move in the valve body 1, and the stabilizing column 6 is used to drive the sealing plug 7 to move, and the sealing plug 7 is used to seal the air inlet;

[0048] The adjusting mechanism is arranged on the end cover 4. The adjusting mechanism includes a top block 8, a sliding column 9 and a support frame 10. The top block 8 is fixedly connected to the stabilizing column 6. The sliding column 9 is slidably connected in the end cover 4. The support frame 10 is fixedly connected to the end cover 4. A spring 11 is arranged between the top block 8 and the sliding column 9. Two grooves are provided on the support frame 10. A tooth plate 12 is fixedly connected in the groove. A lifting tube 13 is fixedly connected to the sliding column 9. The lifting tube 13 runs through the support frame 10. A wire hole 14 and two slide grooves 1 are provided on the sliding column 9. The wire hole 14 is connected to the two slide grooves 1. A slider 15 is slidably connected in the slide groove 1. A tooth block 16 is fixedly connected to the slider 15. The tooth block 16 Meshing with the tooth plate 12, a spring 2 17 is arranged between the slider 15 and the slide groove 1, a pull rope 18 is fixedly connected between the two sliders 15, the pull rope 18 is located in the wire hole 14, a pull rope 2 19 is fixedly connected to the pull rope 18, the pull rope 2 19 passes through the outlet hole 14 and extends into the lifting tube 13, a lifting rod 20 is slidably connected in the lifting tube 13, the lifting rod 20 is fixedly connected to the pull rope 2 19, a pull block 21 is fixedly connected to the lifting rod 20, the spring 11, the top block 8, etc. are used to provide pressure for the sealing plug 7 and the stabilizing column 6, the spring 2 17, the tooth plate 12, the tooth block 16, the sliding column 9, etc. are used for pressure regulation, and it is convenient for people to replace and disassemble the spring 11;

[0049] Auxiliary mechanism: The auxiliary mechanism is arranged on the movable ring 5. The auxiliary mechanism includes four mounting plates 22. The four mounting plates 22 are detachably connected to the movable ring 5 by two bolts. A slide cylinder 23 is fixedly connected to the mounting plate 22. A slide rod 24 is slidably connected inside the slide cylinder 23. A buffer spring 25 is arranged between the slide cylinder 23 and the slide rod 24. A fixed seat 26 is fixedly connected to the slide rod 24. The buffer spring 25, the slide rod 24, etc. are used to play a buffering protection role, avoiding direct collision between the sealing plug 7 and the air inlet, and can play a certain protective role.

[0050] A sealing groove is provided on the movable ring 5, and a sealing ring 27 is arranged in the sealing groove for sealing, so that the incoming high-pressure gas can also lift up the movable ring 5, avoiding gas leakage, and also facilitating better lifting of the sealing plug 7.

[0051] A threaded ring 28 is rotatably connected to the end cover 4 , and an external thread is provided on the valve body 1 . The threaded ring 28 is threadedly connected to the valve body 1 via the external thread, so as to connect the end cover 4 and the valve body 1 .

[0052] A limit opening is provided on the threaded ring 28, and a second slide groove is provided on the end cover 4. A second slider 29 is slidably connected in the second slide groove, and a limit block 30 is fixedly connected to the second slider 29. The limit block 30 is located in the limit opening, and a threaded rod 31 is rotatably connected in the second slide groove. The second slider 29 is threadedly connected to the threaded rod 31. The threaded rod 31 passes through the second slide groove and is fixedly connected to an adjusting button 32, which is used to play a limit role to prevent the threaded ring 28 from rotating under pressure.

[0053] Two guide shafts 33 are fixedly connected in the second slide groove, and the second slider 29 is slidably connected to the two guide shafts 33 to play a guiding role and make the second slider 29 more stable.

[0054] Two guide grooves are provided in the end cover 4, and two guide blocks 34 are fixedly connected to the sliding column 9. The guide blocks 34 are located in the guide grooves and are used to play a limiting and guiding role, thereby improving the stability of the sliding column 9 and preventing the sliding column 9 from rotating at will.

[0055] A buffer pad 35 is fixedly connected to the fixing seat 26 to provide a buffering protection and prevent the fixing seat 26 from colliding with the valve body 1 .

[0056] A stabilizing ring 36 is fixedly connected to the end cover 4 , and the stabilizing column 6 is slidably connected to the stabilizing ring 36 . The stabilizing ring 36 is located in the valve body 1 to ensure the stability of the stabilizing column 6 when it moves up and down, and at the same time to facilitate the limiting effect on the moving ring 5 .

[0057] The threaded ring 28 is provided with anti-slip grooves 37 to increase friction, making it easier for people to rotate and remove the threaded ring 28.

[0058] In summary, the working principle and working process of the expansion device of the variable capacity compressor are as follows: when in use, first place the expansion device of the variable capacity compressor at the location where it is required to be used, and then connect the air inlet pipe 2 and the air outlet pipe 3 to the external pipeline. When the gas in the air inlet pipe 2 needs to enter, the gas will push the sealing plug 7 to move, and then push the moving ring 5 and the sealing ring 27 to move. The sealing plug 7, the moving ring 5, etc. will drive the stabilizing column 6, the top block 8, etc. to move. At this time, the spring 11 will be squeezed, and then the moving ring 5 will press on the stabilizing ring 36. The stabilizing ring 36 is used to limit the moving ring 5 and ensure the stability of the stabilizing column 6. Then the gas enters the valve body 1 and is discharged through the air outlet pipe 3. When not in use, the gas no longer enters the valve body 1, and the spring 11 The sliding rod 24 slides in the sliding cylinder 23 to compress the buffer spring 25, which is convenient for buffering and avoids the sealing plug 7 from having a strong impact with the air inlet, thereby improving the service life. It should be further explained that the force generated by the elastic force of the spring 11 is greater than the elastic force generated by the four buffer springs 25. Then, when adjustment is needed, due to the tooth angle on the tooth plate 12 and the tooth block 16, when the pressure of the extrusion spring 11 is increased, the pull block 21 and the lifting tube 13 can be directly pressed to make the sliding column 9 squeeze the spring 11. At this time, the tooth block 16 will rebound on the tooth plate 12. The spring 17 is repeatedly engaged and moved. With the cooperation of the tooth block 16, the slider 15 and the slide groove 1, the spring 17 will be repeatedly extended and retracted. After adjustment, just release your hand to complete the adjustment of the spring 11. Then, when it is necessary to release the pressure of the spring 11 or take out and replace the spring 11, people only need to pull the pull block 21 so that the pull block 21 pulls the lifting rod 20, the pull rope 219 and the pull rope 18 to move. In this way, the pull rope 18 will pull the two sliders 15 to move, and the slider 15 drives the tooth block 16 to move, and the tooth block 16 is disengaged from the tooth plate 12 and is no longer engaged. At this time, the sliding column 9 can move, and people can adjust to reduce the pressure of the spring 11, or move out the sliding column 9 to replace the spring 11, which improves practicality and facilitates people. The maintenance of the valve body 1 and the end cover 4 can be carried out. Then, when it is necessary to separate the valve body 1 and the end cover 4, people can turn the adjusting knob 32 to make the adjusting knob 32 drive the threaded rod 31 to rotate. The rotation of the threaded rod 31 will drive the threaded slider 29 to slide in the slide groove 2, so that the slider 29 drives the limit block 30 to move out of the limit port. Then people can rotate and remove the threaded ring 28, so that the end cover 4 and the valve body 1 are separated. People can take out the stabilizing column 6, the moving ring 5, the sealing plug 7, etc., and can disassemble the slide cylinder 23, the slide rod 24, etc. through the cooperation of the bolts, the mounting plate 22, etc., so as to facilitate replacement. It needs to be further explained that the spring 11 and the buffer spring 25 are under a large pressure environment for a long time due to gas reasons and frequent use of manual adjustment.Therefore, after long-term use, its elastic force decays significantly and its service life is short. The spring 2 17 is only stretched and contracted during adjustment, and is not in a long-term pressure state. Therefore, the service life of the spring 2 17 is much higher than that of the spring 11 and the buffer spring 25, and it is difficult to be damaged. It should be further explained that the device is not only applicable to gas, but also to liquid, such as refrigerant, etc., and has high practicality and applicability.

[0059] The above embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An expansion device for a variable capacity compressor, characterized in that: include: A valve body (1), wherein the valve body (1) is connected to an air outlet pipe (3), and the valve body (1) is fixedly connected to an air inlet pipe (2); An end cover (4), wherein the end cover (4) is mounted on the valve body (1); An operating mechanism, the operating mechanism is arranged in the valve body (1), the operating mechanism comprises an air inlet and a moving ring (5), the air inlet is opened on the valve body (1), the moving ring (5) is slidably connected in the valve body (1), a stabilizing column (6) is passed through and fixedly connected to the moving ring (5), a sealing plug (7) is fixedly connected to the stabilizing column (6), the sealing plug (7) is located in the air inlet, and the stabilizing column (6) extends into the end cover (4); The adjusting mechanism is arranged on the end cover (4), and the adjusting mechanism comprises a top block (8), a sliding column (9) and a support frame (10). The top block (8) is fixedly connected to the stabilizing column (6), the sliding column (9) is slidably connected in the end cover (4), and the support frame (10) is fixedly connected to the end cover (4). A spring (11) is arranged between the top block (8) and the sliding column (9), and the support frame (10) is provided with two grooves, and a tooth plate (12) is fixedly connected in the groove. A lifting tube (13) is fixedly connected to the sliding column (9), and the lifting tube (13) passes through the support frame (10). The sliding column (9) is provided with a wire hole (14) and two slide grooves, and the wire hole (14) is connected to the two slide grooves. The slide groove is connected to the first slide groove, wherein a slider (15) is slidably connected therein, a tooth block (16) is fixedly connected to the slider (15), the tooth block (16) is meshed with the tooth plate (12), a spring (17) is arranged between the slider (15) and the first slide groove, a pull rope (18) is fixedly connected between the two sliders (15), the pull rope (18) is located in the wire hole (14), a pull rope (19) is fixedly connected to the pull rope (18), the pull rope (19) passes through the wire hole (14) and extends into the lifting tube (13), a lifting rod (20) is slidably connected therein, the lifting rod (20) is fixedly connected to the pull rope (19), and a pull block (21) is fixedly connected to the lifting rod (20); An auxiliary mechanism is arranged on the moving ring (5) and is used to play a buffering role.

2. The expansion device of the variable capacity compressor according to claim 1, characterized in that: The auxiliary mechanism comprises four mounting plates (22), each of the four mounting plates (22) being detachably connected to the movable ring (5) by two bolts, a slide cylinder (23) being fixedly connected to the mounting plate (22), a slide rod (24) being slidably connected inside the slide cylinder (23), a buffer spring (25) being arranged between the slide cylinder (23) and the slide rod (24), and a fixing seat (26) being fixedly connected to the slide rod (24).

3. The expansion device of the variable capacity compressor according to claim 2, characterized in that: The movable ring (5) is provided with a sealing groove, and a sealing ring (27) is arranged in the sealing groove.

4. The expansion device of the variable capacity compressor according to claim 3, characterized in that: The end cover (4) is rotatably connected with a threaded ring (28), the valve body (1) is provided with an external thread, and the threaded ring (28) is threadedly connected to the valve body (1) via the external thread.

5. The expansion device of the variable capacity compressor according to claim 4, characterized in that: The threaded ring (28) is provided with a limit opening, the end cover (4) is provided with a second slide groove, a second slider (29) is slidably connected in the second slide groove, a limit block (30) is fixedly connected to the second slider (29), the limit block (30) is located in the limit opening, a threaded rod (31) is rotatably connected in the second slide groove, the second slider (29) is threadedly connected to the threaded rod (31), and the threaded rod (31) passes through the second slide groove and is fixedly connected to an adjusting button (32).

6. The expansion device of the variable capacity compressor according to claim 5, characterized in that: Two guide shafts (33) are fixedly connected in the second slide groove, and the second slide block (29) is slidably connected to the two guide shafts (33).

7. The expansion device of the variable capacity compressor according to claim 6, characterized in that: Two guide grooves are provided in the end cover (4), and two guide blocks (34) are fixedly connected to the sliding column (9), and the guide blocks (34) are located in the guide grooves.

8. The expansion device of the variable capacity compressor according to claim 7, characterized in that: A buffer pad (35) is fixedly connected to the fixing seat (26).

9. The expansion device of the variable capacity compressor according to claim 8, characterized in that: A stabilizing ring (36) is fixedly connected to the end cover (4), the stabilizing column (6) penetrates and is slidably connected to the stabilizing ring (36), and the stabilizing ring (36) is located inside the valve body (1).

10. The expansion device of the variable capacity compressor according to claim 9, characterized in that: The threaded ring (28) is provided with anti-slip grooves (37).

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