Pump body assembly and compressor with same

Abstract

The invention provides a pump body assembly and a compressor with the pump body assembly. The pump body assembly comprises a crankshaft, a crank, an auxiliary structure and a movable scroll plate. The crank is eccentrically arranged on the crankshaft, the movable scroll plate is arranged at the bottom of the movable scroll plate, the movable scroll plate is connected with the crank, and the movable scroll plate and the crank are concentrically arranged; the crankshaft is sleeved with the auxiliary structure, an eccentric hole is formed in the auxiliary structure, the crank penetrates through the eccentric hole, a first sliding bearing is arranged on the inner wall of the eccentric hole, part of the movable scroll plate is located in the eccentric hole, and a first oil film is formed between the inner surface of the first sliding bearing and the outer surface of the movable scroll plate. The first oil film is formed between the inner surface of the sliding bearing and the outer surface of the bearing sleeve, so that the structural sizes of the movable scroll plate and the eccentric part are reduced, and the centrifugal force generated by the movable scroll plate and the crank is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of compressors, and in particular relates to a pump body assembly and a compressor having the pump body assembly. Background Art

[0002] When the scroll compressor compresses the refrigerant, the forces on the movable scroll are relatively complex. These forces may cause the movable scroll to run unstably, and may overturn, causing friction on the teeth, affecting the service life and reliability, and increasing the noise and vibration of the compressor. When the compressor runs at a high speed, the main excitation source of the compressor vibration comes from the centrifugal force generated by the movable scroll and the eccentric part of the crankshaft. This part of the centrifugal force can cause the crankshaft to bend or cause friction in the structure, which is the main factor that needs to be considered for compressor vibration reduction and noise reduction. How to ensure the smooth operation of the movable disk and reduce the excitation of the pump body position is the key direction. Summary of the invention

[0003] The present invention provides a pump body assembly and a compressor having the pump body assembly, which can solve the technical problem that the centrifugal force generated by the eccentric part may cause the bending of the crankshaft or the friction of the structure, thereby causing noise and vibration of the compressor.

[0004] The present invention provides a pump body assembly comprising a crankshaft, a crank, an auxiliary structure and a movable scroll;

[0005] The crank is eccentrically arranged on the crankshaft, a movable scroll is arranged at the bottom of the movable scroll, the movable scroll is connected to the crank, and the movable scroll is concentrically arranged with the crank;

[0006] The auxiliary structure is sleeved on the crankshaft, and is provided with an eccentric hole. The crank is inserted into the eccentric hole, and a first sliding bearing is provided on the inner wall of the eccentric hole. Part of the movable scroll is located in the eccentric hole, and a first oil film is formed between the inner surface of the first sliding bearing and the outer surface of the movable scroll.

[0007] In some embodiments, a second sliding bearing is disposed in the orbiting scroll, and a second oil film is formed between an inner surface of the second sliding bearing and the crank, and the first oil film and the second oil film jointly provide bearing force.

[0008] In some embodiments, the eccentric hole includes a mounting hole section and an eccentric section that are interconnected, the central axis of the mounting hole section is offset from the central axis of the eccentric section, the auxiliary structure is sleeved on the crankshaft through the mounting hole section, the inner wall of the eccentric section is provided with a first sliding bearing, and part of the movable scroll plate is located in the eccentric section.

[0009] In some embodiments, the central axis of the mounting hole segment is concentrically arranged with the geometric central axis of the auxiliary structure, and the central axis of the eccentric segment is concentrically arranged with the central axis of the crank.

[0010] In some embodiments, the auxiliary structure is provided with a step structure extending toward the center of the mounting hole segment, the diameter of the mounting hole segment is smaller than the diameter of the eccentric segment, the crankshaft is provided with a shoulder, and the step structure is interference fit with the shoulder.

[0011] In some embodiments, the auxiliary structure forms an eccentric structure by opening the eccentric hole.

[0012] In some embodiments, the auxiliary structure includes a first annular wall and a second annular wall that are arranged in an enclosed manner. Taking the end face of the auxiliary structure as the projection surface, the wall thickness of the first annular wall is greater than the thickness of the second annular wall, and the minimum wall thickness of the first annular wall is the maximum wall thickness of the second annular wall.

[0013] In some embodiments, the center axis of the crank is eccentrically arranged in a first direction relative to the center axis of the crankshaft, and taking the cross-section of the auxiliary structure as the projection surface, the center axis of the first annular wall is eccentrically arranged in a second direction relative to the center axis of the crank, and the first direction and the second direction are opposite.

[0014] In some embodiments, the pump body assembly further comprises a bracket, the bracket is provided with an installation cavity, and the auxiliary structure is disposed in the installation cavity.

[0015] A compressor comprises a pump body assembly, wherein the pump body assembly is the above-mentioned pump body assembly.

[0016] A pump body assembly and a compressor having the pump body assembly provided by the present invention have the following beneficial effects:

[0017] A first oil film is formed between the inner surface of the sliding bearing of the present invention and the outer surface of the bearing sleeve. The first oil film has a certain bearing capacity, so that the auxiliary structure and the movable scroll disk form a bearing capacity, which can replace the bearing capacity of part of the eccentric part and the movable scroll disk, thereby reducing the structural dimensions of the movable scroll disk and the eccentric part, thereby reducing the centrifugal force generated by the movable disk and the eccentric part, and also reducing the overall mass, reducing the excitation, and thus reducing noise and vibration. While ensuring the bearing capacity, when the height of the movable disk bearing chamber and the eccentric part is reduced, the overturning force arm generated by the bearing support reaction force and the gas force is reduced, making the movable disk more stable, and the eccentric mass of the auxiliary structure can be used to balance the centrifugal force generated by the eccentric part and the movable disk, preventing the crankshaft from warping. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] Figure 1 is a schematic diagram of a pump assembly according to an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the lever arm L according to an embodiment of the present invention.

[0021] Figure 3 is a top view schematic diagram of a bearing sleeve according to an embodiment of the present invention;

[0022] Figure 4 for Figure 3 Cross-sectional view at the middle BB

[0023] Figure 5 A schematic diagram of a second sliding bearing;

[0024] Figure 6 Figure 5 Sectional view at CC.

[0025] Figures: 1-crankshaft; 101-shaft shoulder; 2-crank; 3-auxiliary structure; 311-mounting hole section; 312-eccentric section; 313-step structure; 301-first annular wall; 302-second annular wall; 303-eccentric hole; 4-orbiting scroll; 5-bearing sleeve; 6-first sliding bearing; 7-second sliding bearing; 8-bracket. DETAILED DESCRIPTION

[0026] 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, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0027] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0030] See also Figure 1 As shown, according to an embodiment of the present invention, a pump body assembly is provided, which includes a crankshaft 1, a crank 2, an auxiliary structure 3 and a movable scroll plate 4; the crank 2 is eccentrically arranged on the crankshaft 1, and a bearing sleeve 5 is arranged at the bottom of the movable scroll plate 4, the bearing sleeve 5 is connected to the crank 2, and the bearing sleeve 5 is concentrically arranged with the crank 2; the auxiliary structure 3 is sleeved on the crankshaft 1, and the auxiliary structure 3 is provided with an eccentric hole 303, the crank 2 is penetrated in the eccentric hole 303, and a first sliding bearing 6 is arranged on the inner wall of the eccentric hole 303, and a part of the bearing sleeve 5 is located in the eccentric hole 303, and a first oil film is formed between the inner surface of the first sliding bearing 6 and the outer surface of the bearing sleeve 5.

[0031] Specifically, when installing the pump body assembly, the first sliding bearing 6 is first interference-connected with the auxiliary structure 3, and then the auxiliary structure 3 is installed on the crankshaft 1. The first sliding bearing 6 and the crankshaft 1 are cold-pressed so that the first sliding bearing 6 and the crankshaft 1 are interference-connected and rotate with the crankshaft 1. Then the movable scroll 4 is installed on the crank 2. Part of the bearing sleeve 5 is located in the eccentric hole 303. When the crankshaft 1 rotates, the auxiliary structure 3 and the movable scroll 4 are driven to rotate synchronously.

[0032] In this embodiment, a first oil film is formed between the inner surface of the first sliding bearing 6 and the outer surface of the bearing sleeve 5. The first oil film has a certain bearing capacity, so that the auxiliary structure 3 and the movable scroll 4 form a bearing capacity, which can replace the bearing capacity of part of the crank 2 and the movable scroll 4, thereby reducing the structural dimensions of the movable scroll 4 and the crank 2, thereby reducing the centrifugal force generated by the movable scroll 4 and the crank 2, and also reducing the overall mass, reducing the excitation and thus reducing the noise and vibration. While ensuring the bearing capacity, when the height of the movable scroll 4 bearing chamber and the crank 2 is reduced, the turning force arm generated by the bearing support reaction force and the gas force is reduced, making the movable scroll 4 more stable, and the eccentric mass of the auxiliary structure 3 can be used to balance the centrifugal force generated by the crank 2 and the movable scroll 4 to prevent the crankshaft 1 from warping.

[0033] See also Figure 1 and Figure 2 As shown, a second sliding bearing 7 is arranged in the bearing sleeve 5, and a second oil film is formed between the inner surface of the second sliding bearing 7 and the crank 2, and the first oil film and the second oil film jointly provide bearing capacity.

[0034] Specifically, a second oil film is formed between the inner surface of the second sliding bearing 7 and the crank 2, and a first oil film is formed between the inner surface of the first sliding bearing 6 and the outer surface of the bearing sleeve 5. The two generated oil films have load-bearing capacity. Under the same external load, the load-bearing capacity of the above two oil films together is stronger than the load-bearing capacity of the oil film formed only by the inner surface of the second sliding bearing 7 and the crankshaft 1.

[0035] In this embodiment, the two oil films can reduce direct contact between the bearing sleeve 5 and the crank 2 and between the inner surface of the sliding bearing and the outer surface of the bearing sleeve 5, thereby reducing friction and wear. The oil film can withstand external loads, and the bearing capacity provided by the two oil films together is stronger than that of a single oil film, thereby enhancing the bearing capacity of the entire system.

[0036] It is worth noting that the inner diameter of the first sliding bearing 6 is d, the height of the first sliding bearing 6 is h, the outer diameter of the crank 2 is d1, the height of the crank 2 is h1, the outer diameter of the bearing sleeve 5 is D, the height of the bearing sleeve 5 is H, and in the extension direction of the central axis of the crankshaft 1, the vertical distance from the height center of the movable scroll 4 to the height center of the bearing sleeve 5 is L, and the distance L is the force arm. The oil film bearing capacity of the second sliding bearing 7 is positively correlated with the inner diameter d and the height h. When the auxiliary structure 3 exists, the inner diameter d and the height h can be reduced so that the overall bearing capacity does not change. At the same time, the outer diameter d1, the height h1 and the outer diameter D and the height H will also be reduced accordingly, so that the eccentric mass of the movable scroll 4 and the crank 2 is reduced, and the centrifugal force excitation generated by the movable scroll 4 and the crank 2 will also be reduced. The auxiliary structure 3 itself also has a certain eccentricity. When the compressor is running, this part of the eccentric mass will balance part of the centrifugal force generated by the eccentricity of the crank 2 and the movable scroll 4, and to a certain extent, the bending of the crankshaft 1 caused by the movable scroll 4 and the crank 2 can be weakened. In addition, during the movement of the movable scroll 4, the torque formed by the gas force and the supporting reaction force will cause the movable scroll 4 to overturn. The length of the lever arm is L. When the auxiliary structure 3 is used, the height H of the movable scroll 4 is reduced, so that the lever arm L of the gas force and the supporting reaction force is also reduced. Under the same conditions, the overturning torque will be reduced, which is conducive to the smooth movement of the movable scroll 4.

[0037] See also Figures 1 to 4 As shown, the eccentric hole 303 includes a mounting hole section 311 and an eccentric section 312 which are interconnected. The central axis of the mounting hole section 311 is offset from the central axis of the eccentric section 312. The auxiliary structure 3 is sleeved on the crankshaft 1 through the mounting hole section 311. The inner wall of the eccentric section 312 is provided with a first sliding bearing 6, and part of the bearing sleeve 5 is located in the eccentric section 312.

[0038] In this embodiment, the eccentric setting of the crank 2 can be achieved by offsetting the central axis of the eccentric section 312 and the central axis of the mounting hole section 311, which is crucial for the dynamic balance and motion characteristics of the movable scroll 4. The auxiliary structure 3 is sleeved on the crankshaft 1 through the mounting hole section 311. The first sliding bearing 6 arranged on the inner wall of the eccentric section 312 provides stable support for the crank 2, ensuring the stability and reliability of the crank 2 when rotating at high speed. The first oil film between the first sliding bearing 6 and the bearing sleeve 5, and the second oil film between the second sliding bearing 7 and the crank 2, jointly reduce friction and wear, improve the efficiency and life of the system, and by adjusting the design of the eccentric section 312, the rotor can be dynamically balanced to reduce vibration and noise during operation.

[0039] It is worth noting that the size of the eccentric hole 303 depends on the diameter of the part that needs to be matched (the direction is not limited). In this embodiment, a smaller mounting hole section 311 is formed based on the existing crank 2 structure. In other embodiments, the size and shape of the eccentric hole 303 can be flexibly adjusted according to the structural form of the crank 2 and the crankshaft 1, but it is necessary to ensure that the auxiliary structure 3 is an eccentric structure as a whole, which can balance part of the centrifugal force generated by the eccentricity of the crank 2 and the movable scroll plate 4.

[0040] See also Figures 1 to 4 As shown, the central axis of the mounting hole section 311 is concentrically arranged with the geometric central axis of the auxiliary structure 3 , and the central axis of the eccentric section 312 is concentrically arranged with the central axis of the crank 2 .

[0041] In this embodiment, by ensuring that the mounting hole section 311 is concentric with the geometric center axis of the auxiliary structure 3, and the eccentric section 312 is concentric with the center axis of the crank 2, the concentricity of the auxiliary structure 3 and the crank 2 during rotation can be ensured, thereby reducing vibration. The concentric setting helps to reduce the error caused by the eccentric setting, ensure the precise movement of the movable scroll 4, maintain the efficient operation of the pump body assembly and extend its service life, and the concentric setting can improve the accuracy of the rotating parts, reduce the unbalanced force caused by the eccentricity, thereby reducing noise and vibration, and improving the overall performance of the pump body assembly.

[0042] See also Figures 1 to 4 As shown, the auxiliary structure 3 is provided with a step structure 313 extending toward the center of the mounting hole section 311 , the diameter of the mounting hole section 311 is smaller than the diameter of the eccentric section 312 , the crankshaft 1 is provided with a shaft shoulder 101 , and the step structure 313 is interference fit with the shaft shoulder 101 .

[0043] In this embodiment, the interference fit between the step structure 313 and the shoulder 101 can ensure that the position of the auxiliary structure 3 on the crankshaft 1 is fixed, preventing axial or radial displacement during operation, thereby ensuring the precise positioning of the pump body assembly. The interference fit can provide strong connection strength, making the connection between the auxiliary structure 3 and the crankshaft 1 very firm and suitable for bearing larger loads and impacts.

[0044] See also Figures 1 to 6 As shown, the auxiliary structure 3 forms an eccentric structure by opening an eccentric hole 303 .

[0045] In this embodiment, by adjusting the eccentric structure, the eccentric position can be adjusted dynamically and balanced to reduce vibration and noise during operation.

[0046] See also Figure 2As shown, the auxiliary structure 3 includes a first annular wall 301 and a second annular wall 302 which are arranged in an enclosed manner. Taking the end face of the auxiliary structure 3 as the projection surface, the wall thickness of the first annular wall 301 is greater than the thickness of the second annular wall 302, and the minimum wall thickness of the first annular wall 301 is the maximum wall thickness of the second annular wall 302.

[0047] In this embodiment, the thicker setting of the first annular wall 301 can provide higher structural strength and rigidity, which is very important for withstanding higher loads or maintaining stability under harsh working conditions. The auxiliary structure 3 forms an eccentric structure by opening an eccentric hole 303. The wall thickness setting of the first annular wall 301 and the second annular wall 302 can ensure the tightness and stability during interference fit. The first annular wall 301 and the second annular wall 302 with different wall thicknesses are formed by opening an eccentric hole 303. It is also because the wall thicknesses of the first annular wall 301 and the second annular wall 302 are different that an eccentric structure is formed as a whole.

[0048] See also Figures 1 to 4 As shown, the center axis of the crank 2 is eccentrically arranged relative to the center axis of the crankshaft 1 in the first direction, and with the cross section of the auxiliary structure 3 as the projection surface, the center axis of the first annular wall is eccentrically arranged relative to the center axis of the crank 2 in the second direction, and the first direction and the second direction are opposite.

[0049] In this embodiment, the eccentric setting can be adjusted in the overall eccentric direction by changing the eccentric amount. Since the crank 2 is eccentrically set, the movable scroll plate 4 is also eccentric accordingly. In order to achieve better balance, the first annular wall 301 is thicker, and the eccentric directions of the first annular wall 301 and the crank 2 are also opposite.

[0050] It is worth noting that, in this embodiment, the first direction is rightward, and the second direction is leftward.

[0051] See also Figure 1 As shown, the pump body assembly further comprises a bracket 8, the bracket 8 is provided with a mounting chamber, and the auxiliary structure 3 is arranged in the mounting chamber.

[0052] In this embodiment, by integrating the auxiliary structure 3 into the installation chamber, a compact design of the pump body assembly can be achieved, space occupancy can be reduced, and the compactness and aesthetics of the overall structure can be improved.

[0053] A compressor comprises a pump body assembly, wherein the pump body assembly is the above-mentioned pump body assembly.

[0054] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A pump assembly, characterized in that: include: A crankshaft (1), a crank (2), an auxiliary structure (3) and a movable scroll (4); The crank (2) is eccentrically arranged on the crankshaft (1), a bearing sleeve (5) is arranged at the bottom of the movable scroll (4), the bearing sleeve (5) is connected to the crank (2), and the bearing sleeve (5) and the crank (2) are arranged concentrically; The auxiliary structure (3) is sleeved on the crankshaft (1), and the auxiliary structure (3) is provided with an eccentric hole (303). The crank (2) is inserted into the eccentric hole (303). The inner wall of the eccentric hole (303) is provided with a first sliding bearing (6). Part of the bearing sleeve (5) is located in the eccentric hole (303), and a first oil film is formed between the inner surface of the first sliding bearing (6) and the outer surface of the bearing sleeve (5).

2. The pump assembly according to claim 1, characterized in that: A second sliding bearing (7) is arranged in the bearing sleeve (5), a second oil film is formed between the inner surface of the second sliding bearing (7) and the crank (2), and the first oil film and the second oil film jointly provide bearing capacity.

3. The pump assembly according to claim 1, characterized in that: The eccentric hole (303) comprises a mounting hole section (311) and an eccentric section (312) which are interconnected. The central axis of the mounting hole section (311) is offset from the central axis of the eccentric section (312). The auxiliary structure (3) is sleeved on the crankshaft (1) through the mounting hole section (311). The inner wall of the eccentric section (312) is provided with a first sliding bearing (6), and part of the bearing sleeve (5) is located in the eccentric section (312).

4. The pump assembly according to claim 3, characterized in that: The central axis of the mounting hole section (311) is arranged concentrically with the geometric central axis of the auxiliary structure (3), and the central axis of the eccentric section (312) is arranged concentrically with the central axis of the crank (2).

5. The pump assembly according to claim 4, characterized in that: The auxiliary structure (3) is provided with a step structure (313) extending toward the center of the mounting hole section (311); the diameter of the mounting hole section (311) is smaller than the diameter of the eccentric section (312); the crankshaft (1) is provided with a shaft shoulder (101), and the step structure (313) is interference fit with the shaft shoulder (101).

6. The pump assembly according to any one of claims 1 to 5, characterized in that: The auxiliary structure (3) forms an eccentric structure by opening the eccentric hole (303).

7. The pump assembly according to claim 6, characterized in that: The auxiliary structure (3) comprises a first annular wall (301) and a second annular wall (302) which are arranged in an enclosed manner. Taking the end face of the auxiliary structure (3) as a projection surface, the wall thickness of the first annular wall (301) is greater than the thickness of the second annular wall (302), and the minimum wall thickness of the first annular wall (301) is the maximum wall thickness of the second annular wall (302).

8. The pump assembly according to claim 7, characterized in that: The central axis of the crank (2) is eccentrically arranged in a first direction relative to the central axis of the crankshaft (1); taking the cross section of the auxiliary structure (3) as a projection surface, the central axis of the first annular wall (301) is eccentrically arranged in a second direction relative to the central axis of the crank (2); and the first direction and the second direction are in opposite directions.

9. The pump assembly according to claim 1, characterized in that: The pump body assembly further comprises a bracket (8), wherein the bracket (8) is provided with an installation chamber, and the auxiliary structure (3) is arranged in the installation chamber.

10. A compressor, comprising a pump assembly, characterized in that: The pump body assembly is the pump body assembly according to any one of claims 1 to 9.

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