A compressor with an internal piston

Abstract

The utility model belongs to compressor manufacturing technical field discloses a compressor with inner piston. Among them including casing, the cylindrical cavity is formed in the casing, the eccentric shaft is rotatably installed in the cylindrical cavity, the inner piston is sleeved on the eccentric shaft, the hinge piston is sleeved on the inner piston outside, the hinge piston is contacted with the cylindrical inner wall, the hinge piston is articulated with the vane, and the vane is slidably inserted on the casing.

Description

Technical Field

[0001] This utility model relates to the field of compressor manufacturing technology, and in particular to a compressor with an internal piston. Background Technology

[0002] With dynamic energy efficiency standards imposing higher requirements on wide-frequency operation of compressors (minimum operating frequency needs to be reduced to 8Hz and below), conventional rolling rotor compressors are prone to blade separation and collision with the piston under low-speed and light-load conditions, producing a "ticking" sound. To solve this problem, the industry has proposed an optimization scheme for the blade end and piston hinge structure. By mechanically constraining the relative position of the blade and piston, the separation and collision between the two are prevented, thus eliminating the "ticking" sound at its source.

[0003] However, the aforementioned hinged structure restricts the piston's rotation, leading to an increase in the relative speed between the crankshaft eccentric part and the inner side of the piston. This results in greater frictional power consumption of the eccentric bearing and also causes piston wear, adversely affecting the compressor's performance and reliability. Utility Model Content

[0004] The purpose of this invention is to provide a compressor with an internal piston, which solves the problem that the frictional loss between the internal piston and the eccentric shaft in the existing compressor is too large, which will reduce the engine performance.

[0005] To achieve this objective, the present invention adopts the following technical solution: The present invention provides a compressor with an inner piston, including a housing, a cylindrical cavity formed inside the housing, an eccentric shaft rotatably mounted inside the cylindrical cavity, an inner piston sleeved on the eccentric shaft, a hinged piston sleeved on the outer side of the inner piston, the hinged piston contacting the inner wall of the cylindrical cavity, and blades hinged on the hinged piston, the blades being slidably inserted into the housing.

[0006] Preferably, the inner wall of the hinge piston and the outer wall of the inner piston are in clearance fit.

[0007] Preferably, the inner wall of the inner piston and the outer wall of the eccentric shaft are in clearance fit.

[0008] Preferably, a lubrication groove is formed on the outer surface of the inner piston, and the lubrication groove is filled with lubricating oil.

[0009] Preferably, the inner piston body is made of a wear-resistant material.

[0010] Preferably, the inner piston is made of a self-lubricating material.

[0011] Preferably, lubricating oil is added between the blade and the hinge piston.

[0012] Preferably, a groove is formed inside the housing, the blade is inserted into the groove, and lubricating oil is added between the blade and the groove.

[0013] Preferably, the eccentric shaft and the inner piston are lubricated by lubricating oil.

[0014] Beneficial effects: By installing an inner piston on the outside of the eccentric shaft, the eccentric shaft drives the inner piston to rotate. The inner piston rotates relative to the eccentric shaft, and there is also relative rotation between the inner piston and the hinge piston. By setting the inner piston, the rotation speed of the parts in contact with the inner side of the hinge piston can be reduced, thereby reducing the wear of the hinge piston. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the casing of this utility model.

[0016] In the diagram: 1. Housing; 2. Eccentric shaft; 3. Inner piston; 4. Hinge piston; 5. Blade. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0018] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the 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 the 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" the 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.

[0020] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0021] In the current technology, the hinge piston is in direct contact with the eccentric shaft. Due to the large speed difference between the eccentric shaft and the hinge piston, abnormal wear of the hinge piston will occur, which will shorten the life of the compressor.

[0022] To solve the above problems, such as Figure 1 As shown, this utility model provides a compressor with an inner piston, including a housing 1, a cylindrical cavity formed inside the housing 1, an eccentric shaft 2 rotatably mounted inside the cylindrical cavity, an inner piston 3 sleeved on the eccentric shaft 2, a hinged piston 4 sleeved on the outside of the inner piston 3, the hinged piston 4 contacting the inner wall of the cylinder, and a blade 5 hinged on the hinged piston 4, the blade 5 slidably inserted into the housing 1.

[0023] An inner piston 3 is installed inside the hinge piston 4. The eccentric shaft 2 is in direct contact with the inner piston 3, and the inner piston 3 is in contact with the hinge piston 4. The eccentric shaft 2 drives the inner piston 3 to rotate. Due to the low friction between the eccentric shaft 2 and the inner piston 3, the inner piston 3 can rotate at a speed lower than that of the eccentric shaft 2. This reduces the wear of the hinge piston 4, which is in contact with the inner piston 3 on the outside, and reduces the friction loss of the hinge piston 4 body, thereby extending the life of the compressor and ensuring the working performance of the compressor.

[0024] The clearance fit between the inner wall of the hinge piston 4 and the outer wall of the inner piston 3 of this invention can reduce wear while achieving the fit, thus minimizing the loss between the hinge piston 4 and the inner piston 3.

[0025] The inner wall of the inner piston 3 and the outer wall of the eccentric shaft 2 are fitted with a clearance. Similarly, the eccentric shaft 2 is fitted with both the inner and outer walls of the inner piston 3. This fits together to reduce wear and minimize wear.

[0026] A lubrication groove is provided on the outer surface of the inner piston 3, and the lubrication groove is filled with lubricating oil. By adding lubricating oil between the inner piston 3 and the hinge piston 4, the friction between the inner piston 3 and the hinge piston 4 can be reduced, thereby improving safety.

[0027] At the interface between the hinge piston 4 and the inner piston 3, the design concept of "clearance fit" is crucial. The inner wall of the hinge piston 4 and the outer wall of the inner piston 3 are not rigidly connected, but maintain a precise clearance at the micron level. This ensures that the hinge piston 4 can swing and move smoothly on the inner piston 3 without jamming or additional motion resistance caused by interference fit, thus guaranteeing the smoothness of compressor circulation. The preset clearance provides dedicated space for the storage and flow of lubricating oil. During operation, the lubricating oil can fully fill this clearance, forming a uniform and stable hydrodynamic lubricating oil film. This oil film completely separates the two relatively moving metal surfaces, transforming the solid dry friction between them into viscous shear within the liquid, thereby fundamentally solving the wear problem. In addition, the appropriate clearance can also accommodate the small deformations caused by frictional heat and the dimensional tolerances that are unavoidable during manufacturing, improving the fault tolerance of the assembly parts and the assembly consistency.

[0028] Furthermore, at the interface between the inner piston 3 and the eccentric shaft 2, the inner wall of the inner piston 3 and the outer wall of the eccentric shaft 2 form a typical "sliding bearing" pair. The eccentric shaft 2, as the power input shaft, transmits the enormous torque and radial force generated by its high-speed rotation to the inner piston 3 through this clearance fit, driving it to complete complex planar motion. This clearance fit is an ideal model for achieving hydrodynamic lubrication. When the eccentric shaft 2 rotates, it naturally "pumps" lubricating oil into the convergence region of the clearance, forming an oil wedge with extremely high pressure, thanks to its geometric eccentricity and rotational speed. This powerful oil wedge is sufficient to support the shaft during operation, allowing it to "float" above the oil film, achieving near-zero contact power transmission. This not only reduces mechanical wear to an extremely low level but also significantly reduces energy loss during transmission, improving the compressor's energy efficiency.

[0029] The inner piston 3 body is made of wear-resistant material, which allows the inner side of the inner piston 3 to withstand the friction of the eccentric shaft 2 and the outer side to withstand the friction of the hinge piston 4, thus extending the service life of the inner piston 3, improving safety, and also extending the service time of the inner piston 3, thereby improving the installation strength.

[0030] The inner piston 3 of this invention is made of a self-lubricating material. It can be made of a material similar to graphite. By lubricating the inner piston 3, the friction between the inner piston 3 and the eccentric shaft 2 can be increased, and the friction coefficient between the inner piston 3 and the hinge piston 4 can also be reduced, thereby extending the service life of the inner side of the hinge piston 4.

[0031] Lubricating oil is added between the blade 5 and the hinge piston 4. A sliding groove is formed inside the housing 1. The blade 5 is inserted into the sliding groove. Lubricating oil is added between the blade 5 and the sliding groove. The eccentric shaft 2 and the inner piston 3 are lubricated by the lubricating oil. The above-mentioned lubricating oil reduces the friction between the blade 5 and the hinge piston 4, as well as between the blade 5 and the sliding groove, and between the eccentric shaft 2 and the inner piston 3, thereby extending the service life of the compressor.

[0032] The lubrication interface between blade 5 and hinged piston 4, and the hinge connection between the root of blade 5 and the piston, bears enormous alternating stress, accompanied by high-frequency micro-oscillations. To reduce dry friction, which could lead to increased wear or even "seizing" and jamming, a specially designed lubrication path guides lubricating oil to this point, forming a tough oil film on the contact surface. This oil film effectively separates the two moving parts, converting harmful solid friction into intermolecular shearing within the liquid, thereby greatly reducing the coefficient of friction and wear rate, ensuring flexible and smooth transmission.

[0033] The lubrication interface between blade 5 and the groove of housing 1 is crucial. During compression, blade 5 undergoes high-speed reciprocating motion within the groove of housing 1. This interface serves as both a guiding mechanism and a vital sealing area isolating the high- and low-pressure chambers. Adding lubricating oil here fulfills three functions: first, it reduces sliding friction between the side of blade 5 and the groove wall, lowering power loss; second, it utilizes the viscosity of the oil to help fill the microscopic gaps between blade 5 and the groove, enhancing the sealing effect, reducing internal leakage of compressed gas, and improving volumetric efficiency; third, and most importantly, it prevents blade 5 and the groove from expanding and seizing due to frictional heat under high temperature and pressure, avoiding catastrophic failures. The lubricating oil plays an indispensable role in lubrication, sealing, and cooling.

[0034] The lubrication interface between the eccentric shaft 2 and the inner piston 3 is essentially one of the main bearing structures of the compressor. As a power input component, the rotational motion of the eccentric shaft 2 is converted into a compression stroke by the inner piston 3. The load at this point is extremely high, and the relative speed is very fast. Lubricating oil is pumped into the gap between the eccentric shaft 2 and the inner piston 3, forming a stable "hydrodynamic lubrication" oil wedge. This oil wedge perfectly supports the rotating eccentric shaft 2, keeping it in a "suspended" state during high-speed operation and preventing direct metal-to-metal contact. This not only minimizes wear but also continuously removes heat generated by friction, effectively cooling the bearing components.

[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 various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments 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 compressor with an internal piston, characterized in that, The device includes a housing (1), which forms a cylindrical cavity. An eccentric shaft (2) is rotatably mounted inside the cylindrical cavity. An inner piston (3) is sleeved on the eccentric shaft (2). A hinged piston (4) is sleeved on the outside of the inner piston (3). The hinged piston (4) is in contact with the inner wall of the cylindrical cavity. A blade (5) is hinged on the hinged piston (4). The blade (5) is slidably inserted into the housing (1).

2. The compressor with an internal piston according to claim 1, characterized in that, The inner wall of the hinge piston (4) and the outer wall of the inner piston (3) are fitted with a clearance.

3. The compressor with an internal piston according to claim 1, characterized in that, The inner wall of the inner piston (3) and the outer wall of the eccentric shaft (2) are fitted with a clearance.

4. The compressor with an internal piston according to claim 1, characterized in that, The outer surface of the inner piston (3) is provided with a lubrication groove, which is filled with lubricating oil.

5. The compressor with an internal piston according to claim 1, characterized in that, The inner piston (3) body is made of wear-resistant material.

6. The compressor with an internal piston according to claim 1, characterized in that, The inner piston (3) is made of a self-lubricating material.

7. The compressor with an internal piston according to claim 1, characterized in that, Lubricating oil is added between the blade (5) and the hinge piston (4).

8. The compressor with an internal piston according to claim 1, characterized in that, A groove is formed inside the housing (1), the blade (5) is inserted into the groove, and lubricating oil is added between the blade (5) and the groove.

9. The compressor with an internal piston according to claim 1, characterized in that, The eccentric shaft (2) and the inner piston (3) are lubricated by lubricating oil.

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