Piston for a compressor and rolling rotor compressor

Abstract

The utility model relates to the technical field of compressor, specifically disclose a kind of piston and rolling rotor compressor for compressor, wherein, piston body is arranged in cylinder, and the outside wall of piston body is equipped with hinged recess, hinged recess is used to be hinged with vane, the outer circumferential surface of piston body is coated with soft coating and forms interference fit between cylinder inner wall, the thickness range of soft coating is 0.015 mm-0.03mm.Such setting, soft coating as a kind of buffer medium, it will produce self-adapting trace wear in the operation process of compressor, this wear is not performance attenuation, but a beneficial "running-in" process, it can further promote sealing surface contact state constantly self-optimization, finally form a perfect fit with cylinder inner wall Sealing camber, realize the dynamic optimization between piston body and cylinder clearance, to maximum degree reduce radial leakage, to improve the energy efficiency ratio of compressor to optimum state.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a piston and rolling rotor compressor for compressors. Background Technology

[0002] Under dynamic energy efficiency requirements, compressors need to achieve wide-frequency operation, with the minimum operating frequency needing to be reduced to 8Hz or even lower. However, in existing rolling rotor compressors, the blades and piston are prone to detachment and impact under low-speed, light-load conditions, producing a "ticking" noise. To solve this problem, a "blade tip-piston hinge structure" is usually adopted, which forces the blades and piston to move synchronously through a rigid connection (such as pins, slots, etc.), fundamentally preventing them from detaching and impacting. However, this structure restricts the piston's rotation. The hinge structure fixes the relative position of the blades and piston, preventing the piston from rotating around its own axis. This further undermines the ability of the piston to adaptively adjust the clearance with the cylinder through rotation, a capability inherent in traditional structures. With restricted piston rotation, the adaptive adjustment capability of the axial trajectory under gas force is weakened when the piston rotates with the eccentric crankshaft. Uneven clearances easily form between the piston and the cylinder wall, leading to a significant increase in radial leakage of refrigerant and other gases, thus reducing the compressor's energy efficiency ratio.

[0003] Therefore, there is an urgent need for a piston and rolling rotor compressor for compressors to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a piston and rolling rotor compressor for compressors, which can effectively reduce radial leakage and improve the compressor's energy efficiency ratio and operational reliability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a piston for a compressor, applied to a rolling rotor compressor. The rolling rotor compressor includes blades and a cylinder. The piston for the compressor includes a piston body disposed inside the cylinder, and the outer side wall of the piston body has a hinge groove for hinged connection with the blades. The outer peripheral surface of the piston body is coated with a soft coating to form an interference fit with the inner wall of the cylinder. The thickness of the soft coating ranges from 0.015 mm to 0.03 mm.

[0007] As a preferred technical solution for the piston of the above-mentioned compressor, the rolling rotor compressor further includes a hinge structure, through which the blades are connected to the piston body, and the hinge structure is configured to enable a rotating pair to be formed between the blades and the piston body.

[0008] As a preferred technical solution for the piston of the above-mentioned compressor, the hinge structure includes a hinge member and a shaft portion disposed at the tip of the blade. The hinge member passes through the coaxial holes on both sides of the hinge groove and the mounting hole on the shaft portion to hinge the blade to the piston body.

[0009] As a preferred technical solution for the piston of the above-mentioned compressor, the hinge member and the coaxial holes on both sides of the hinge groove, as well as the hinge member and the mounting hole on the shaft, are all clearance fits.

[0010] As a preferred technical solution for the piston of the aforementioned compressor, the fitting clearance of the hinge is 0.005mm-0.01mm.

[0011] As a preferred technical solution for the piston of the aforementioned compressor, the hinge component is a pin.

[0012] As a preferred technical solution for the piston of the above-mentioned compressor, the bonding strength between the soft coating and the piston body is not less than 6MPa.

[0013] As a preferred technical solution for the piston of the aforementioned compressor, the soft coating is a manganese-based phosphating coating.

[0014] As a preferred technical solution for the piston used in the aforementioned compressor, the piston body is made of cast iron.

[0015] On the other hand, this utility model also provides a rolling rotor compressor, including blades, a cylinder, a crankshaft and a compressor piston as described in any of the above embodiments. The crankshaft is driven to the piston body and can drive the piston body to roll in the cylinder. One end of the blade is hinged to the piston body, and the other end of the blade slides in contact with the inner wall of the cylinder.

[0016] The beneficial effects of this utility model are as follows:

[0017] This utility model provides a piston for a compressor and a rolling rotor compressor. The piston for the compressor is applied to a rolling rotor compressor, which includes blades and a cylinder. The piston for the compressor includes a piston body, which is disposed inside the cylinder. The outer side wall of the piston body is provided with a hinge groove for hinged connection with the blades. The outer peripheral surface of the piston body is coated with a soft coating to form an interference fit with the inner wall of the cylinder. The thickness of the soft coating ranges from 0.015 mm to 0.03 mm. This design involves coating the entire circumference of the piston body with a soft coating. As a buffering medium, the soft coating will generate adaptive micro-wear during the operation of the compressor. This wear is not a performance degradation, but a beneficial "run-in" process. It can further promote the continuous self-optimization of the sealing surface contact state, and finally form a sealing surface that perfectly fits the inner wall of the cylinder. This achieves dynamic optimization of the clearance between the piston body and the cylinder, so as to minimize radial leakage and improve the compressor's energy efficiency ratio to the optimal state. At the same time, the soft material has certain damping characteristics, which helps to absorb the small vibrations generated during the operation of the piston body, thereby reducing the operating noise of the compressor. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of the rolling rotor compressor provided by this utility model.

[0019] in:

[0020] 1. Blade; 2. Cylinder; 3. Piston body; 4. Soft coating; 5. Crankshaft. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0023] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, this embodiment provides a piston for a compressor. This piston is applied to a rolling rotor compressor, which includes blades 1 and a cylinder 2. The piston includes a piston body 3, which is disposed inside the cylinder 2. The outer side wall of the piston body 3 is provided with a hinge groove for hinged connection with the blades 1. The outer peripheral surface of the piston body 3 is coated with a soft coating 4 to form an interference fit with the inner wall of the cylinder 2. The thickness of the soft coating 4 ranges from 0.015 mm to 0.03 mm. With this configuration, a soft coating 4 is applied to the entire circumference of the outer diameter of the piston body 3. As a buffer medium, the soft coating 4 will generate adaptive micro-wear during the operation of the compressor. This wear is not a performance degradation, but a beneficial "run-in" process. It can further promote the continuous self-optimization of the sealing surface contact state, and finally form a sealing surface that perfectly fits the inner wall of the cylinder 2. This achieves dynamic optimization of the gap between the piston body 3 and the cylinder 2, so as to minimize radial leakage and improve the energy efficiency ratio of the compressor to the optimal state. At the same time, the soft material has certain damping characteristics, which helps to absorb the small vibrations generated during the operation of the piston body 3, thereby reducing the operating noise of the compressor.

[0027] It should be noted that the adaptive adjustment process of the soft coating 4 in this embodiment is as follows: When the compressor is running, the eccentric crankshaft 5 drives the piston body 3 to rotate eccentrically in the cylinder 2. Since the piston body 3 (including the soft coating 4) and the cylinder 2 are initially interference fit, that is, the soft coating 4 provides thickness compensation, so that the outer diameter of the piston body 3 and the inner diameter of the cylinder 2 form a zero clearance fit after assembly, that is, the initial "zero radial clearance" (no assembly clearance). During the operation of the compressor, the soft coating 4 and the inner wall of the cylinder 2 generate slight friction. Under the combined action of gas force and the extrusion force of the cylinder 2 wall, the excess material on the surface of the soft coating 4 is uniformly worn away until the piston body 3 and the cylinder 2 form an "optimal working clearance" of 0.01mm-0.02mm (this clearance can avoid rigid collision between the piston body 3 and the cylinder 2 and minimize gas radial leakage).

[0028] Optionally, the rolling rotor compressor also includes a hinge structure, through which the blades 1 are connected to the piston body 3. The hinge structure is configured to form a rotating pair between the blades 1 and the piston body 3. This configuration, employing an overall design of "hinge structure + soft coating 4 on the full circumference of the piston body 3," retains the noise reduction advantages of the hinge structure while restricting the rotation of the piston body 3. Since the piston body 3 cannot rotate, the blades 1 and the piston body 3 are rigidly connected through the hinge structure, with no relative sliding or scraping. This ensures uniform wear of the soft coating 4 on the full circumference of the piston body 3, avoiding abnormal clearances caused by excessive local wear.

[0029] Specifically, this embodiment provides the following exemplary technical solution: the hinge structure includes a hinge member and a shaft portion disposed at the tip of the blade 1. The hinge member passes through coaxial holes on both sides of the hinge groove and mounting holes on the shaft portion to hinge the blade 1 to the piston body 3. Further, the hinge member is a pin.

[0030] Optionally, the hinge and the coaxial holes on both sides of the hinge groove, as well as the hinge and the mounting holes on the shaft, are clearance fits. Furthermore, the clearance of the hinge is 0.005mm-0.01mm, which further ensures the stability of the piston body 3's movement trajectory and provides a basis for uniform wear of the soft coating 4.

[0031] Optionally, in order to further avoid adverse phenomena such as direct peeling of the soft coating 4 during compressor operation, the bonding strength between the soft coating 4 and the piston body 3 shall not be less than 6 MPa, and the piston body 3 shall be made of cast iron.

[0032] In this embodiment, a soft coating 4 is formed on the outer wall (full circumference) of the piston body 3 using a thermal spraying process. The soft coating 4 is a manganese-based phosphate coating, which combines wear resistance and self-lubrication, reducing the frictional resistance between the piston body 3 and the cylinder 2, lowering operating power consumption. Simultaneously, its elastic properties buffer minor impacts between the piston body 3 and the cylinder 2, further reducing operating noise and improving operational stability. Of course, in other embodiments, the specific material of the soft coating 4 can be set according to actual needs, and is not further limited here.

[0033] It should be noted that the soft coating 4 has a wide range of material sources and a mature thermal spraying process, making it suitable for mass production. It does not require ultra-high precision machining, and the machining tolerances of the piston body 3 and the cylinder 2 substrate can be appropriately relaxed to further reduce machining costs.

[0034] This embodiment also provides a rolling rotor compressor, including blades 1, cylinder 2, crankshaft 5 and the compressor piston in the above scheme. The crankshaft 5 is driven to the piston body 3 and can drive the piston body 3 to roll in the cylinder 2. One end of the blades 1 is hinged to the piston body 3, and the other end of the blades 1 slides in contact with the inner wall of the cylinder 2.

[0035] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A piston for a compressor, characterized in that, The invention is applied to a rolling rotor compressor, which includes blades (1) and a cylinder (2). The piston of the compressor includes a piston body (3), which is disposed inside the cylinder (2). The outer side wall of the piston body (3) is provided with a hinge groove, which is used to hinge with the blades (1). The outer peripheral surface of the piston body (3) is coated with a soft coating (4) to form an interference fit with the inner wall of the cylinder (2). The thickness of the soft coating (4) is in the range of 0.015 mm to 0.03 mm.

2. The compressor piston according to claim 1, characterized in that, The rolling rotor compressor also includes a hinge structure, through which the blade (1) is connected to the piston body (3), and the hinge structure is configured to enable a rotating pair to be formed between the blade (1) and the piston body (3).

3. The compressor piston according to claim 2, characterized in that, The hinge structure includes a hinge member and a shaft portion disposed at the tip of the blade (1). The hinge member passes through coaxial holes on both sides of the hinge groove and mounting holes on the shaft portion to hinge the blade (1) to the piston body (3).

4. The compressor piston according to claim 3, characterized in that, The hinge and the coaxial holes on both sides of the hinge groove, as well as the hinge and the mounting hole on the shaft, are all clearance fits.

5. The compressor piston according to claim 4, characterized in that, The fitting clearance of the hinge is 0.005mm-0.01mm.

6. The compressor piston according to claim 3, characterized in that, The hinge component is a pin.

7. The compressor piston according to any one of claims 1-6, characterized in that, The bonding strength between the soft coating (4) and the piston body (3) is not less than 6 MPa.

8. The compressor piston according to any one of claims 1-6, characterized in that, The soft coating (4) is a manganese-based phosphate coating.

9. The compressor piston according to any one of claims 1-6, characterized in that, The piston body (3) is made of cast iron.

10. A rolling rotor compressor, characterized in that, The compressor includes a blade (1), a cylinder (2), a crankshaft (5), and a piston for a compressor as described in any one of claims 1-9. The crankshaft (5) is driven to the piston body (3) and is capable of driving the piston body (3) to roll within the cylinder (2). One end of the blade (1) is hinged to the piston body (3), and the other end of the blade (1) slides in contact with the inner wall of the cylinder (2).

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