Compression structure and compressor

Abstract

The present invention discloses a compression structure and a compressor, which solves the problem of low operating reliability of compressors in the prior art. The compression structure includes an upper flange, a lower flange, a crankshaft and a support top structure. The eccentric portion of the crankshaft is rotatably arranged between the upper flange and the lower flange. The support top structure is arranged on the crankshaft, and the first end of the support top structure protrudes from the crankshaft to contact the upper flange and / or the lower flange. The compression structure and the compressor of the present invention, by arranging the support top structure on the crankshaft and utilizing the contact between the support top structure and the upper flange and / or the lower flange, reduce the contact area between the crankshaft and the upper flange and / or the lower flange, avoid direct friction between the crankshaft and the upper flange and / or the lower flange, and when the degree of wear of the support top structure is high, only the support top structure can be replaced without replacing the crankshaft, thereby reducing the production cost of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compression equipment, and more particularly to a compression structure and a compressor. Background Art

[0002] At present, rotary compressors (vertical) are widely used in refrigeration systems. Among them, the lower thrust surface of the crankshaft of the rotary compressor is in direct contact with the lower flange plane. During the operation of the compressor, the roller cooperates with the eccentric part of the crankshaft to perform circular motion. The above two surfaces wear against each other, eventually causing the compressor to malfunction.

[0003] In order to solve the above problems, the existing technology adopts methods such as spraying chemical coating on the crankshaft surface, setting guide holes and guide grooves on the eccentric part of the crankshaft, etc. However, due to the complex structure of parts, limited spraying technology, unsatisfactory lubrication effect and high cost of chemical coating, the reliability of the compressor is reduced. Summary of the Invention

[0004] The present invention discloses a compression structure and a compressor which utilize a support top structure to reduce wear between a crankshaft and a flange and ensure reliable lubrication of the crankshaft to improve reliability, thereby solving the problem of low operating reliability of compressors in the prior art.

[0005] The present invention discloses a compression structure, including an upper flange, a lower flange, a crankshaft and a support top structure, wherein the eccentric portion of the crankshaft is rotatably arranged between the upper flange and the lower flange, the support top structure is arranged on the crankshaft, and the first end of the support top structure protrudes from the crankshaft to abut against the upper flange and / or the lower flange.

[0006] The supporting structure is arranged on the eccentric portion.

[0007] The crankshaft has an upper thrust surface facing the upper flange, a mounting hole is formed on the upper thrust surface, the support structure is arranged in the mounting hole, and the first end of the support structure protrudes from the mounting hole and abuts and cooperates with the upper flange; and / or, the crankshaft has a lower thrust surface facing the lower flange, a mounting hole is formed on the lower thrust surface, the support structure is arranged in the mounting hole, and the first end of the support structure protrudes from the mounting hole and abuts and cooperates with the lower flange.

[0008] There is a distance between the side wall of the supporting structure and the inner wall of the mounting hole, and the width of the distance ranges from 0.005mm to 0.010mm.

[0009] The compression structure further includes an elastic mechanism, which is disposed in the mounting hole. The supporting structure is connected to the elastic mechanism, and the elastic mechanism enables the supporting structure to protrude from the mounting hole.

[0010] The supporting top structure is provided with an accommodating groove, one end of the elastic mechanism is arranged in the accommodating groove, and the other end abuts against the bottom surface of the mounting hole.

[0011] The relationship between the length L1 of the portion of the support structure protruding from the crankshaft and the length L of the support structure is 1 / 12L≤L1≤1 / 3L.

[0012] A wear-resistant coating is provided on the supporting top structure or on the first end of the supporting top structure.

[0013] The number of the supporting top structures is at least two, and all the supporting top structures are distributed on the eccentric portion in an arc shape with the rotation axis of the crankshaft as an axis.

[0014] The crankshaft includes an upper eccentric portion, and the support structure is provided on the end surface of the upper eccentric portion facing the upper flange; and / or the crankshaft includes a lower eccentric portion, and the support structure is provided on the end surface of the lower eccentric portion facing the lower flange.

[0015] Another aspect of the present invention provides a compressor comprising the above-mentioned compression structure.

[0016] The compression structure and compressor of the present invention provide a support top structure on the crankshaft and utilize the contact between the support top structure and the upper flange and / or lower flange to reduce the contact area between the crankshaft and the upper flange and / or lower flange, thereby avoiding direct friction between the crankshaft and the upper flange and / or lower flange. When the degree of wear of the support top structure is high, only the support top structure can be replaced without replacing the crankshaft, thereby reducing the production cost of the compressor; moreover, the support top structure can create a gap between the crankshaft and the upper flange and / or lower flange, so that the lubricating oil can flow smoothly to the crankshaft, thereby increasing the lubrication degree of the crankshaft; secondly, the support structure creates a gap between the crankshaft and the upper flange and / or lower flange, which can also avoid the crankshaft from moving up and down when the crankshaft is running, and greatly avoid mutual collision and mutual wear during operation to generate thrust noise; it is also possible to provide a coating only on the contact part between the support top structure and the upper flange and / or lower flange, thereby reducing the coating area of ​​the parts, further reducing the coating cost of the parts, and selecting high-quality coatings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of a compression structure according to an embodiment of the present invention;

[0018] Figure 2 2 is a schematic structural diagram of a top support structure and an elastic mechanism of a compression structure according to an embodiment of the present invention;

[0019] Figure 3 is another structural schematic diagram of the compression structure of an embodiment of the present invention;

[0020] Figure 4 is another structural schematic diagram of the compression structure of an embodiment of the present invention;

[0021] Legend: 1. Upper flange; 2. Lower flange; 3. Crankshaft; 31. Eccentric portion; 4. Support structure; 32. Lower thrust surface; 33. Upper thrust surface; 34. Mounting hole; 5. Elastic mechanism; 311. Upper eccentric portion; 312. Lower eccentric portion. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the embodiments, but is not limited to the contents of the description.

[0023] like Figures 1 to 4 As shown, the present invention discloses a compression structure, including an upper flange 1, a lower flange 2, a crankshaft 3 and a support top structure 4, wherein the eccentric portion 31 of the crankshaft 3 is rotatably arranged between the upper flange 1 and the lower flange 2, the support top structure 4 is arranged on the crankshaft 3, and the first end of the support top structure 4 protrudes from the crankshaft 3 to abut against the upper flange 1 and / or the lower flange 2. By providing a support top structure 4 on the crankshaft 3 and utilizing the contact between the support top structure 4 and the upper flange 1 and / or the lower flange 2, the contact area between the crankshaft 3 and the upper flange 1 and / or the lower flange 2 is reduced, thereby avoiding direct friction between the crankshaft 3 and the upper flange 1 and / or the lower flange 2. When the wear degree of the support top structure 4 is high, only the support top structure 4 can be replaced without replacing the crankshaft 3, thereby reducing the production cost of the compressor; moreover, the support top structure 4 can create a gap between the crankshaft 3 and the upper flange 1 and / or the lower flange 2, so that the lubricating oil can flow smoothly to the crankshaft 3, thereby increasing the lubrication degree of the crankshaft 3; secondly, the support structure creates a gap between the crankshaft 3 and the upper flange 1 and / or the lower flange 2, thereby avoiding the crankshaft 3 from moving up and down during operation, which is beneficial to improving noise and eliminating thrust; it is also possible to provide a coating only on the contact portion of the support top structure 4 and the upper flange 1 and / or the lower flange 2, thereby reducing the coating area of ​​the parts, further reducing the coating cost of the parts, and selecting high-quality coatings.

[0024] Specifically, the support structure 4 is disposed on the eccentric portion 31. The compression structure also includes a roller, which is mounted on the eccentric portion 31 and can move under the drive of the eccentric portion 31 to achieve gas compression. The placement of the support structure 4 on the eccentric portion 31 ensures that the support structure 4 supports the crankshaft 3, preventing the roller from being separated from the eccentric portion 31 due to axial extrusion force, thereby ensuring the reliability of the compressor.

[0025] In a vertical rotor compressor, the crankshaft 3 tends to move downward due to gravity, resulting in a high degree of friction between the crankshaft 3 and the lower flange 2. To this end, the crankshaft 3 has a lower thrust surface 32 facing the lower flange 2. A mounting hole 34 is formed on the lower thrust surface 32. The support structure 4 is disposed within the mounting hole 34, and the first end of the support structure 4 protrudes from the mounting hole 34 to abut against the lower flange 2. The support structure 4 supports the crankshaft 3, creating a gap between the lower thrust surface 32 of the crankshaft 3 and the lower flange 2, reducing the friction area between the crankshaft 3 and the lower flange 2. Furthermore, a gap is created between the crankshaft 3 and the lower flange 2, allowing lubricating oil to smoothly enter the gap, thereby improving the lubrication effect between the crankshaft 3 and the lower flange 2 and effectively enhancing the reliability of the compression structure.

[0026] Furthermore, since the crankshaft 3 moves up and down during the operation of the compression structure, collision or contact friction will occur between the crankshaft 3 and the upper flange 1. Therefore, the crankshaft 3 has an upper thrust surface 33 facing the upper flange 1. A mounting hole 34 is formed on the upper thrust surface 33. The supporting structure 4 is arranged in the mounting hole 34, and the first end of the supporting structure 4 protrudes from the mounting hole 34 and abuts against the upper flange 1. When the crankshaft 3 moves toward the upper flange 1, the supporting structure 4 on the upper thrust surface 33 can contact the upper flange 1.

[0027] Of course, mounting holes 34 are provided on the upper thrust surface 33 and the lower thrust surface 32 of the crankshaft 3, and support structures 4 are provided in the mounting holes 34, which can ensure that the crankshaft 3 is reliably supported and can also prevent the crankshaft 3 from moving up and down and causing collision and interference with the upper flange 1.

[0028] Preferably, a gap is provided between the sidewall of the supporting structure 4 and the inner wall of the mounting hole 34, with the width of the gap ranging from 0.005 mm to 0.010 mm. If the gap is less than 0.005 mm, the gap is too small, and the supporting structure 4 cannot be smoothly installed and moved within the mounting hole 34. If the gap is greater than 0.010 mm, the gap is too large, and the coaxiality between the supporting structure 4 and the mounting hole 34 is less reliable, thus failing to ensure the supporting effect of the supporting structure 4. Therefore, the reliability of the supporting structure 4 is optimal only when the gap is within the range of 0.005 mm to 0.010 mm.

[0029] Among them, the mounting hole 34 can be a blind hole, and the end of the supporting top structure 4 extending into the mounting hole 34 abuts against the bottom surface of the blind hole; or, the mounting hole 34 can be a stepped hole, and the end of the supporting top structure 4 extending into the mounting hole 34 abuts against the step of the stepped hole, and the inner diameter of the part of the stepped hole away from the supporting top structure 4 is smaller than the diameter of the supporting top structure 4.

[0030] As another embodiment, since the crankshaft 3 may move up and down during operation, the supporting top structure 4 may still be out of contact with the upper flange 1 or the lower flange 2. When the supporting top structure 4 is out of contact with the upper flange 1 or the lower flange 2 again, a collision will still occur, causing noise. For this reason, the compression structure further includes an elastic mechanism 5, which is arranged in the mounting hole 34. The supporting top structure 4 is connected to the elastic mechanism 5, and the elastic mechanism 5 can make the supporting top structure 4 protrude from the mounting hole 34. The elastic mechanism 5 is used to force the supporting top structure 4 to move to the outside of the mounting hole 34, so that the first end of the supporting top structure 4 is always in contact with the upper flange 1 or the lower flange 2, thereby avoiding collision between the supporting top structure 4 and the upper flange 1 or the lower flange 2 and reducing the noise of the compression structure.

[0031] The supporting structure 4 is provided with a receiving groove, in which one end of the elastic mechanism 5 is disposed, and the other end abuts against the bottom surface of the mounting hole 34. The receiving groove is used to limit the position of one end of the elastic mechanism 5, thereby preventing the elastic mechanism 5 from being disengaged from the supporting structure 4 and causing the supporting structure 4 to deviate, thereby ensuring the reliability of the compression structure.

[0032] The relationship between the length L1 of the portion of the support structure 4 protruding from the crankshaft 3 and the length L of the support structure 4 is 1 / 12L≤L1≤1 / 3L. When L1 is less than 1 / 12L, the support structure 4 cannot fully support the crankshaft 3, the distance between the crankshaft 3 and the upper flange 1 and / or lower flange 2 is too small, and there is still a possibility of collision, and the amount of lubricating oil that can enter this distance is small, and the lubrication effect on the crankshaft 3 is also poor. When L1 is greater than 1 / 3L, the distance between the crankshaft 3 and the upper flange 1 or lower flange 2 is large, the support structure 4 protrudes from the crankshaft 3 for a long distance and there is a possibility of bending, and the amount of lubricating oil that enters this distance is large, affecting the normal rotation of the crankshaft 3. Therefore, only within the range of 1 / 12L≤L1≤1 / 3L, the support structure 4 has the best support effect on the crankshaft 3, the amount of lubricating oil is moderate, and the reliability of the compression structure is guaranteed. Preferably, L1 is 1 / 6L.

[0033] When the elastic mechanism 5 is a spring, the sum of the length L of the supporting structure 4 and the free length of the spring is greater than the depth of the mounting hole 34 and 1 / 6 of the length L of the supporting structure 4 .

[0034] Optionally, when the compression structure includes both a support structure 4 abutting the upper flange 1 and a support structure 4 abutting the lower flange 2, and a spring is provided at each support structure 4, since the spring corresponding to the support structure 4 abutting the lower flange 2 needs to correspond to the mass of the crankshaft 3 and the rotor assembly provided on the crankshaft 3 and the irregular up and down movement generated when the crankshaft 3 drives the roller to run, the elasticity and hardness of the spring corresponding to the support structure 4 abutting the lower flange 2 need to be greater than the elasticity and hardness of the spring corresponding to the support structure 4 abutting the upper flange 1.

[0035] As an embodiment, the supporting structure 4 is a pin, and the axis of the pin is colinear with the axis of the mounting hole 34 .

[0036] Preferably, the shape and position tolerances of the rotation axis of the crankshaft 3, the eccentric portion 31 of the crankshaft 3 and the axis of the mounting hole 34 and the pin, the inner hole of the compression cylinder, and the inner and outer circles of the roller are consistent.

[0037] The support structure 4 is provided with a wear-resistant coating. By providing the wear-resistant coating on the entire support structure 4, the contact points between the support structure 4 and the upper flange 1 or the lower flange 2 and the contact points between the support structure 4 and the crankshaft 3 are less worn, thereby improving the reliability of the compression structure.

[0038] Alternatively, a wear-resistant coating is provided on the first end of the supporting structure 4. The coating area of ​​the wear-resistant coating is reduced, thereby reducing production costs while ensuring the wear resistance of the contact position between the supporting structure 4 and the upper flange 1 or the lower flange 2.

[0039] The material of the wear-resistant coating may be a diamond-like carbon (DLC) coating, or other materials with anti-wear and anti-corrosion effects.

[0040] There are at least two supporting structures 4, all of which are distributed in an arc shape on the eccentric portion 31 with the rotation axis of the crankshaft 3 as the axis. By providing multiple supporting structures 4, the crankshaft 3 can be prevented from tilting, ensuring the reliable operation of the compression structure.

[0041] When the compression structure is a dual-cylinder or multi-cylinder compression, the crankshaft 3 of the compression structure includes at least two eccentric parts 31, and all the eccentric parts 31 are arranged in parallel between the upper flange 1 and the lower flange 2, and they can compress the gas in sequence to form multi-stage compression or compress the gas at the same time to increase the compression efficiency. To this end, the crankshaft 3 includes an upper eccentric part 311, and the support top structure 4 is provided on the end face of the upper eccentric part 311 facing the upper flange 1, wherein the upper eccentric part 311 refers to the eccentric part 31 at the top of all the eccentric parts 31, and the upper part is the upper flange 1.

[0042] The crankshaft 3 includes a lower eccentric portion 312, and the support structure 4 is provided on the end surface of the lower eccentric portion 312 facing the lower flange 2, wherein the lower eccentric portion 312 refers to the eccentric portion 31 at the bottom of all the eccentric portions 31, and the lower flange 2 is below it.

[0043] When the compression structure is a single-cylinder machine (single eccentric part 31 ), it is preferred to only provide the supporting structure 4 on the eccentric part 31 .

[0044] The single-cylinder engine is smaller in size and lighter in weight, and its operating environment is more common than that of the dual-cylinder (two eccentric parts 31) and multi-cylinder (multiple eccentric parts 31) commercial units. Therefore, the single-cylinder engine can only be provided with a mounting hole 34 (blind hole or through hole) on the lower thrust surface 32 where the eccentric part 31 cooperates with the lower flange 2, and a supporting structure 4 is provided in the mounting hole 34 to abut against the lower flange 2.

[0045] Due to the different high-frequency operation states of the single-cylinder engine, the degree of up and down movement of the crankshaft 3 is also different. Therefore, it is necessary to specifically set the upper thrust surface 33 of the eccentric part 31 of the single-cylinder engine crankshaft 3 with a structure similar to the lower thrust surface 32. If the high-frequency operation state of the single-cylinder engine is more intense, an elastic mechanism 5 can be set on the single-cylinder engine to ensure the reliability of the single-cylinder engine.

[0046] When the compression structure is a dual-cylinder or multi-cylinder machine, it is preferred to set a support structure 4 and an elastic mechanism 5 on both the upper eccentric part 311 and the lower eccentric part 312, or only set the support structure 4, and the specific installation is selected according to the status of the compression structure during use.

[0047] Another aspect of the present invention provides a compressor comprising the above-mentioned compression structure.

[0048] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not possible to enumerate all embodiments here. Any obvious variations or modifications arising from the technical solution of the present invention remain within the scope of protection of the present invention.

Claims

1. A compression structure, characterized in that: The crankshaft (3) comprises an upper flange (1), a lower flange (2), a crankshaft (3) and a support top structure (4); the eccentric portion (31) of the crankshaft (3) is rotatably arranged between the upper flange (1) and the lower flange (2); the support top structure (4) is arranged on the crankshaft (3); the crankshaft (3) has an upper thrust surface (33) facing the upper flange (1), and a mounting hole (34) is provided on the upper thrust surface (33); and / or the crankshaft (3) has a lower thrust surface (32) facing the lower flange (2), and a mounting hole (34) is provided on the lower thrust surface (32); The compression structure further comprises an elastic mechanism (5), wherein the elastic mechanism (5) and the supporting structure (4) are arranged in the mounting hole (34), the supporting structure (4) is connected to the elastic mechanism (5), and the elastic mechanism (5) can make the first end of the supporting structure (4) protrude from the mounting hole (34) and abut against the upper flange (1) and / or the lower flange (2).

2. The compression structure according to claim 1, characterized in that: The supporting top structure (4) is arranged on the eccentric portion (31).

3. The compression structure according to claim 1, wherein: There is a distance between the side wall of the supporting structure (4) and the inner wall of the mounting hole (34), and the width of the distance ranges from 0.005 mm to 0.010 mm.

4. The compression structure according to claim 1, wherein: The supporting top structure (4) is provided with a receiving groove, one end of the elastic mechanism (5) is provided in the receiving groove, and the other end abuts against the bottom surface of the mounting hole (34).

5. The compression structure according to claim 1 or 2, characterized in that: The relationship between the length L1 of the portion of the support structure (4) protruding from the crankshaft (3) and the length L of the support structure (4) is 1 / 12L≤L1≤1 / 3L.

6. The compression structure according to claim 1, wherein: A wear-resistant coating is provided on the supporting top structure (4) or on the first end of the supporting top structure (4).

7. The compression structure according to claim 2, characterized in that: The number of the supporting top structures (4) is at least two, and all the supporting top structures (4) are distributed on the eccentric portion (31) in an arc shape with the rotation axis of the crankshaft (3) as an axis.

8. The compression structure according to claim 2, characterized in that: The crankshaft (3) includes an upper eccentric portion (311), and the support structure (4) is provided on the end surface of the upper eccentric portion (311) facing the upper flange (1); and / or the crankshaft (3) includes a lower eccentric portion (312), and the support structure (4) is provided on the end surface of the lower eccentric portion (312) facing the lower flange (2).

9. A compressor, characterized in that: A compression structure comprising the compression structure of any one of claims 1 to 8.

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