An integrated crankshaft structure and scroll compressor

Abstract

This utility model relates to the field of scroll compressor technology, and more particularly to an integrated crankshaft structure and scroll compressor. The integrated crankshaft structure includes a crankshaft body, the end of which is mounted on the inner side of the moving disc hub of the scroll compressor's moving scroll disc; and a balance block portion integrally formed with the crankshaft body. The balance block portion extends between the moving disc hub and the upper frame of the scroll compressor, and an annular cavity is formed between the moving disc hub and the upper frame. When the crankshaft body rotates, the balance block portion moves within the annular cavity. This integrated crankshaft structure and scroll compressor can solve the problem of the large weight and stress fatigue of the balance block structure in existing scroll compressors.

Description

Technical Field

[0001] This application relates to the field of scroll compressor technology, and in particular to an integrated crankshaft structure and scroll compressor. Background Technology

[0002] Currently, scroll compressors generally use a dynamic balancing system composed of a main balancing block, a rotor balancing block, and a moving scroll plate to balance torque and reduce noise and vibration.

[0003] Existing main balance weights are generally connected to the crankshaft via an interference fit, or mounted on the crankshaft via a bushing. In both of these mounting methods, the main balance weight has a circumferentially symmetrical structure. The symmetrical part is only used to connect the main balance weight to the crankshaft and does not contribute to dynamic balancing; it is a useless weight in dynamic balancing.

[0004] The symmetrical structure of the main balance block increases its weight. Furthermore, the balance block is typically located below the main frame. As the distance between the main balance block and the moving scroll plate increases, the lever arm L also lengthens, further increasing the weight of the main balance block and the rotating body, leading to a decrease in compressor performance. Additionally, the unavoidable machining tolerances, height tolerances, and angular tolerances in the assembly of the main balance block and crankshaft make it extremely difficult to improve the vibration acceleration of the compressor at high speeds. The main balance block is typically made of 45# steel, while the crankshaft of high-speed scroll compressors is often made of 40Cr. After interference fitting, the difference in materials and the initial stress generated by the interference fit easily lead to stress concentration and stress fatigue at high speeds, resulting in reduced reliability of the scroll compressor. Utility Model Content

[0005] In view of this, the purpose of this application is to provide an integrated crankshaft structure and scroll compressor to solve the problem that the balance block structure in existing scroll compressors is heavy and prone to stress fatigue.

[0006] According to a first aspect of the present invention, an integrated crankshaft structure is provided, wherein the integrated crankshaft structure includes: a crankshaft body, the end of which is mounted on the inner side of the moving disc hub of the moving scroll disk of the scroll compressor; and a balance block portion integrally formed with the crankshaft body, the balance block portion extending between the moving disc hub and the upper frame of the scroll compressor, an annular cavity being formed between the moving disc hub and the upper frame, wherein the balance block portion moves within the annular cavity when the crankshaft body rotates.

[0007] Preferably, the balance block portion includes: a first extension portion connected to the circumferential surface of the crankshaft body, the first extension portion extending radially along the crankshaft body; and a second extension portion connected to the first extension portion, the second extension portion extending axially along the crankshaft body, a gap portion being provided between the second extension portion and the circumferential surface of the crankshaft body.

[0008] Preferably, the balance block is located on the side of the crankshaft body near the center of the crankshaft.

[0009] Preferably, the first extension has a crescent-shaped cross-section, and the second extension is disposed on the outer edge of the first extension.

[0010] Preferably, the thickness of the second extension gradually decreases from the center to both ends in the circumferential direction, and the first extension and the second extension are symmetrically arranged along the line connecting the crankshaft center of the crankshaft body and the center of the crankshaft eccentric part as the line of symmetry.

[0011] Preferably, the upper frame has a cylindrical cavity inside, the balance block and the moving disc hub are located in the cylindrical cavity, the inner sidewall of the upper frame and the outer sidewall of the moving disc hub form the annular cavity, the width of the annular cavity is greater than the thickness of the second extension, and the width of the interval is greater than the wall thickness of the moving disc hub.

[0012] Preferably, the crankshaft body includes: an upper shaft portion, which is mounted to the moving disc hub via an upper bearing; a main shaft portion, which is mounted to the upper frame via a main bearing; and a lower shaft portion, which is mounted to the lower frame of the scroll compressor via a lower bearing.

[0013] Preferably, the motor rotor of the scroll compressor is interference-fitted with the middle part of the main shaft, the first extension is formed at the top of the main shaft, and the top of the second extension is lower than the top of the upper shaft.

[0014] Preferably, the crankshaft body and the balance block are made of powder metallurgy material, and a central oil hole is formed in the middle of the crankshaft body, extending axially through the crankshaft body.

[0015] According to a second aspect of the present invention, a scroll compressor is provided, wherein the scroll compressor includes an integrated crankshaft structure as described above.

[0016] This utility model discloses an integrated crankshaft structure and scroll compressor, in which the end of the crankshaft body is installed inside the moving disc hub of the scroll compressor's moving scroll. The balance block is integrally formed with the crankshaft body. The balance block extends between the moving disc hub and the upper frame of the scroll compressor. An annular cavity is formed between the moving disc hub and the upper frame, and the balance block moves within this annular cavity as the crankshaft body rotates. This design significantly reduces the distance between the center of mass of the balance block and the center of mass of the moving scroll, greatly reducing the required weight of the balance block and the distance between the center of mass of the balance block and the crankshaft center, thereby reducing centrifugal force at high speeds. Furthermore, since the balance block is integrally formed with the crankshaft body, there is no need for a circumferentially symmetrical structure, eliminating unnecessary weight. Simultaneously, the absence of gaps between the balance block and the crankshaft body avoids noise and stress fatigue. This effectively solves the problem of the large weight and stress fatigue inherent in existing scroll compressor balance block structures.

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the integrated crankshaft structure and scroll compressor according to this utility model.

[0020] Figure 2 This is a cross-sectional view of the integrated crankshaft structure and scroll compressor according to this utility model.

[0021] Figure 3 According to this utility model Figure 2 A cross-sectional view of the crankshaft body rotated 90 degrees.

[0022] Figure 4 This is a schematic diagram of the integrated crankshaft structure according to the present invention.

[0023] Reference numerals: 1-Crankshaft body; 10-Center oil hole; 11-Upper shaft section; 12-Main shaft section; 13-Lower shaft section; 101-Crankshaft center; 102-Crankshaft eccentric section center; 103-Line of symmetry; 2-Balance block section; 21-First extension section; 22-Second extension section; 3-Moving scroll plate; 30-Moving disc hub; 4-Upper frame; 40-Cylindrical cavity; 41-Annular cavity; 5-Lower frame; 6-Motor rotor; 7-Tube shell; 81-Upper bearing; 82-Main bearing; 83-Lower bearing. Detailed Implementation

[0024] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0025] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0026] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0027] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0028] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0029] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0030] The terminology used herein is for the purpose of describing various examples only and is not intended to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0031] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0032] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0033] like Figures 1 to 4 As shown, according to a first aspect of the present invention, an integrated crankshaft structure is provided, the integrated crankshaft structure including a crankshaft body 1 and a balance block portion 2.

[0034] In the following description, reference will be made to Figures 1 to 4 The specific structure of the aforementioned components of the integrated crankshaft structure and the connection relationship of the aforementioned components are described in detail.

[0035] like Figures 1 to 4 As shown, in this embodiment, the end of the crankshaft body 1 can be installed inside the moving disc hub 30 of the moving scroll disk 3 of the scroll compressor. The balance block portion 2 can be integrally formed with the crankshaft body 1. The balance block portion 2 can extend between the moving disc hub 30 and the upper frame 4 of the scroll compressor. Specifically, an annular cavity 41 can be formed between the moving disc hub 30 and the upper frame 4, and the balance block portion 2 can move within the annular cavity 41 when the crankshaft body 1 rotates. This configuration greatly reduces the distance between the center of mass of the balance block portion 2 and the center of mass of the moving scroll disk 3, significantly reducing the weight required for the balance block portion 2, and also reducing the distance between the center of mass of the balance block portion 2 and the crankshaft center 101, thereby reducing the centrifugal force at high speeds. In addition, when the balance block portion 2 is integrally formed with the crankshaft body 1, the balance block portion 2 does not need to have a circumferentially symmetrical structure, thus eliminating unnecessary weight. Meanwhile, since there is no gap between the balance block 2 and the crankshaft body 1, problems such as noise and stress fatigue caused by fit tolerances are avoided, thereby improving the reliability of the scroll compressor.

[0036] Specifically, in the embodiments, such as Figure 1 As shown, the upper frame 4 can be welded to the inner wall of the casing 7, and the crankshaft body 1 can be vertically inserted through the upper frame 4. A moving scroll plate 3 is disposed on the upper part of the upper frame 4. The bottom surface of the moving scroll plate 3 is provided with an axially extending moving plate hub 30, which can be formed into an annular shape. A cylindrical cavity 40 can be provided inside the upper frame 4, and the moving plate hub 30 can be disposed within the cylindrical cavity 40. The top end of the crankshaft body 1 is mounted on the moving plate hub 30.

[0037] Preferred, such as Figures 1 to 4 As shown, in this embodiment, the balance block portion 2 may include a first extension 21 and a second extension 22. The first extension 21 can be connected to the circumferential surface of the crankshaft body 1, meaning the first extension 21 protrudes beyond the circumferential surface of the crankshaft body 1. The first extension 21 can extend radially along the crankshaft body 1, and the second extension 22 can be connected to the first extension 21. The second extension 22 can extend axially along the crankshaft body 1 (i.e., vertically upward). A spacer may also be provided between the second extension 22 and the circumferential surface of the crankshaft body 1 to prevent friction between the second extension 22 and the outer wall of the moving disc hub 30.

[0038] Preferred, such as Figure 2 and Figure 3As shown, in this embodiment, the balance block 2 can be disposed on the side of the crankshaft body 1 near the crankshaft center 101. Specifically, since the crankshaft center 101 of the crankshaft body 1 is offset from the axis of the crankshaft body 1, the crankshaft body 1 has a side near the crankshaft center 101 and a side away from the crankshaft center 101, and the balance block 2 is disposed on the side of the crankshaft body 1 near the crankshaft center 101 (which can be as follows). Figure 2 (The right side of the crankshaft body 1 shown). This arrangement allows the balance block 2 to effectively balance the torque when the motion scroll disk 3 rotates eccentrically.

[0039] Preferred, such as Figures 1 to 4 As shown, in this embodiment, the cross-section of the first extension 21 can be crescent-shaped (i.e., a shape formed by two arcs). The first extension 21 can be integrally formed with the crankshaft body 1 and protrude from the circumferential surface of the crankshaft body 1. The second extension 22 can be disposed on the outer edge of the first extension 21, such that the second extension 22 and the circumferential surface of the crankshaft body 1 form the aforementioned gap.

[0040] Furthermore, preferably, such as Figures 1 to 4 As shown, in this embodiment, the second extension 22 can extend horizontally along the outer edge of the first extension 21, and the thickness of the second extension 22 can gradually decrease from the center to both ends in the circumferential direction, so that the cross-section of the second extension 22 is approximately crescent-shaped. More preferably, with the line connecting the crankshaft center 101 of the crankshaft body 1 and the crankshaft eccentricity center 102 as the symmetry line 103, the first extension 21 and the second extension 22 can be symmetrically arranged along the symmetry line 103, thereby ensuring that the center of mass of the balance block portion 2 is located on the symmetry line 103, further improving the balancing torque capability of the balance block portion 2.

[0041] In addition, preferred, such as Figure 1 and Figure 4 As shown, in this embodiment, the upper frame 4 has a cylindrical cavity 40 inside, and the balance block portion 2 and the moving disc hub 30 can be disposed within the cylindrical cavity 40. The cross-section of the cylindrical cavity 40 can be circular, so that the inner wall of the upper frame 4 (i.e., the inner wall of the cylindrical cavity 40) and the outer wall of the moving disc hub 30 can form the annular cavity 41. The width of the annular cavity 41 can be greater than the thickness of the second extension 22 to avoid friction between the second extension 22 and the inner wall of the upper frame 4 during rotation. The width of the gap between the second extension 22 and the circumferential surface of the crankshaft body 1 can be greater than the wall thickness of the moving disc hub 30 to avoid friction between the second extension 22 and the outer wall of the moving disc hub 30 during rotation.

[0042] Preferred, such as Figure 1 and Figure 4 As shown, in this embodiment, the crankshaft body 1 may include an upper shaft portion 11, a main shaft portion 12, and a lower shaft portion 13. The outer diameter of the main shaft portion 12 may be larger than the outer diameters of the upper shaft portion 11 and the lower shaft portion 13. The upper shaft portion 11 can be mounted on the inner side of the moving disc hub 30 via an upper bearing 81 to drive the rotating scroll disc 3 to rotate. The main shaft portion 12 can be mounted on the upper frame 4 via a main bearing 82. The scroll compressor also has a lower frame 5 welded to the casing 7, and the lower shaft portion 13 can be mounted on the lower frame 5 via a lower bearing 83.

[0043] Further optimized, such as Figure 1 and Figure 4 As shown, in this embodiment, the scroll compressor is equipped with a motor. The motor rotor 6 of the scroll compressor can be interference-fitted with the middle part of the main shaft 12. The frequency converter of the motor can control the motor stator, so that the motor rotor 6 drives the crankshaft body 1 to rotate, thereby driving the moving scroll disk 3 to rotate. Preferably, the first extension 21 can be formed on the top of the main shaft 12, and the top end of the second extension 22 can be lower than the top end of the upper shaft 11 to avoid friction between the second extension 22 and the bottom surface of the moving scroll disk 3.

[0044] Preferred, such as Figures 1 to 4 As shown, in this embodiment, the crankshaft body 1 and the balance block 2 can be formed from powder metallurgy materials. Specifically, the crankshaft body 1 and the balance block 2 can be formed by pressing and sintering iron-nickel alloy powder. Powder metallurgy has advantages such as high precision and low machining volume, which can improve the angular accuracy between the balance block 2 and the eccentric part of the crankshaft, reduce the vibration and pipeline stress caused by unbalanced torque, and reduce the machining volume. A central oil hole 10 can be formed in the middle of the crankshaft body 1, and the central oil hole 10 can penetrate the crankshaft body 1 axially. The central oil hole 10 can be formed by pressing and sintering without the need for deep hole drilling, thereby reducing the machining volume. Since the balance block 2 is integrally formed with the crankshaft body 1, there is no need to set a circumferentially symmetrical structure, and the position of the balance block 2 is shifted upward as a whole, so that the weight of the balance block 2 can be reduced by 40% to 60%, thereby greatly improving the performance of the scroll compressor at high speed.

[0045] In addition, such as Figure 1 As shown, according to a second aspect of the present invention, a scroll compressor is provided, the scroll compressor including the integrated crankshaft structure as described above.

[0046] During use, the balance block 2 and the crankshaft body 1 are formed by pressing and sintering powder metallurgy materials, and their outer surfaces are machined to ensure the tolerance range and roughness of the outer diameter. The balance block 2 extends between the moving disc hub 30 and the upper frame 4 of the scroll compressor, thereby greatly reducing the distance between the center of mass of the balance block 2 and the center of mass of the moving scroll 3, significantly reducing the weight required for the balance block 2, and the distance between the center of mass of the balance block 2 and the crankshaft center 101 is also small, thus reducing the centrifugal force at high speeds. In addition, when the balance block 2 is integrally formed with the crankshaft body 1, there is no need to set a circumferential symmetrical structure, thus eliminating unnecessary weight. The integrated crankshaft structure has the advantages of compact structure, high machining accuracy, significantly reduced balance block weight to improve high-speed performance, reduced high-speed vibration acceleration, pipeline stress and noise, etc., enhancing overall rigidity and reducing high-speed vibration deformation, thereby greatly improving the reliability of the scroll compressor.

[0047] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An integrated crankshaft structure, disposed in a scroll compressor, characterized in that, The integrated crankshaft structure includes: A crankshaft body, the end of which is mounted inside the moving disc hub of the moving scroll disk of the scroll compressor; and The balance block is integrally formed with the crankshaft body and extends between the moving disc hub and the upper frame of the scroll compressor. An annular cavity is formed between the moving disc hub and the upper frame. When the crankshaft body rotates, the balance block moves within the annular cavity.

2. The integrated crankshaft structure of claim 1, wherein The balance block section includes: A first extension is connected to the circumferential surface of the crankshaft body, and the first extension extends radially along the crankshaft body; and The second extension is connected to the first extension and extends along the axial direction of the crankshaft body. A gap is provided between the second extension and the circumferential surface of the crankshaft body.

3. The integrated crankshaft structure of claim 2, wherein The balance block is located on the side of the crankshaft body near the center of the crankshaft.

4. The integrated crankshaft structure of claim 3, wherein The first extension has a crescent-shaped cross-section, and the second extension is disposed on the outer edge of the first extension.

5. The integrated crankshaft structure of claim 4 wherein, The thickness of the second extension gradually decreases from the center to both ends in the circumferential direction. The first extension and the second extension are symmetrically arranged along the line connecting the center of the crankshaft body and the center of the crankshaft eccentric part as the line of symmetry.

6. The integrated crankshaft structure of claim 2 wherein, The upper frame has a cylindrical cavity inside, the balance block and the moving disc hub are located in the cylindrical cavity, the inner side wall of the upper frame and the outer side wall of the moving disc hub form the annular cavity, the width of the annular cavity is greater than the thickness of the second extension, and the width of the interval is greater than the wall thickness of the moving disc hub.

7. The integrated crankshaft structure of claim 2 wherein, The crankshaft body includes: The upper shaft is mounted to the moving disc hub via an upper bearing; The spindle section is mounted on the upper frame via a main bearing; and The lower shaft is mounted to the lower frame of the scroll compressor via a lower bearing.

8. The integrated crankshaft structure of claim 7, wherein The motor rotor of the scroll compressor is interference-fitted with the middle part of the main shaft, the first extension is formed on the top of the main shaft, and the top of the second extension is lower than the top of the upper shaft.

9. The integrated crankshaft structure of claim 1 wherein, The crankshaft body and the balance block are made of powder metallurgy material, and a central oil hole is formed in the middle of the crankshaft body, which runs through the crankshaft body axially.

10. A scroll compressor characterized by, The scroll compressor includes an integrated crankshaft structure as described in any one of claims 1 to 9.

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