Scroll compressor

Abstract

The utility model provides a scroll compressor, including compressor casing, upper support, orbiting scroll, static scroll, compressor casing is hollow cylinder, upper support has the cooperation end surface of supporting static scroll, upper support is coaxial with compressor casing setting, in the axial projection of compressor casing, the outer circle of cooperation end surface is at the radial outside of the inner circle wall surface of compressor casing and is at the radial inside of the outer circle wall surface of compressor casing, and upper support is via ring platform and is installed on the first end surface of compressor casing. The utility model has realized the radial space of upper support's outward expansion, thereby is favorable to the arrangement of the larger disc diameter orbiting scroll in the upper support, satisfies the extension of scroll type coil number and the design demand of scroll type line larger eccentricity, guarantees the feasibility of small shell diameter scroll compressor large displacement design, and the upper cover can form the sealed connection with compressor casing at the position, reduces assembly difficulty and improves sealing effect.

Description

Technical Field

[0001] This utility model belongs to the field of compressor design technology, specifically relating to a scroll compressor. Background Technology

[0002] Scroll compressors are characterized by simple structure, small size, light weight, low noise, high mechanical efficiency, and stable operation. With the continuous improvement of technological requirements, the current requirements for the compact structure of scroll compressors are becoming increasingly stringent. However, with the compaction of the scroll compressor structure, a contradiction arises between the small casing diameter and the large displacement of the compressor. In other words, the compact design with a small casing diameter and the large displacement of the compressor are incompatible. How to further increase the compressor displacement while achieving a small casing diameter is one of the technical problems that this utility model aims to solve. Utility Model Content

[0003] Therefore, this utility model provides a scroll compressor that can overcome the incompatibility between the compact design of the small shell diameter structure of the scroll compressor and the large displacement of the compressor in the related technology, which leads to the limitation of the increase of the compressor displacement.

[0004] To address the aforementioned problems, this utility model provides a scroll compressor, comprising a compressor housing, an upper support, a moving scroll, and a stationary scroll. The stationary scroll is mounted on the moving scroll. The compressor housing is a hollow cylinder. The upper support has a mating end face that supports the stationary scroll. The upper support is coaxially arranged with the compressor housing and projected axially onto the compressor housing. The outer circle of the mating end face is radially outside the inner circle wall of the compressor housing and radially inside the outer circle wall of the compressor housing. The upper support is mounted on the first end face of the compressor housing via a ring platform.

[0005] In some embodiments, the radial thickness of the annular platform is d, and the radial thickness of the first end face of the compressor housing is w, where w / 3≤d≤w / 2.

[0006] In some embodiments, the upper support also has a bearing portion that rotates with the crankshaft, the bearing portion being located radially inside the annular platform, and the outer circular wall surface of the bearing portion being welded to the inner circular wall surface of the compressor housing.

[0007] In some embodiments, the axial thickness between the annular platform and the mating end face of the stationary vortex disk and the upper support is H, where H ≥ 10 mm.

[0008] In some embodiments, the outer edge of the stationary scroll is fixedly connected to the upper bracket via threaded connectors, projecting axially onto the compressor housing, with each threaded connector at least partially located within the annular area covered by the annular platform.

[0009] In some embodiments, the scroll compressor further includes an upper cover having an annular wall disposed radially outside the upper support and sealed to the compressor housing.

[0010] In some embodiments, an annular groove extending around the central axis of the compressor housing is formed on the open side end face of the annular wall, and the annular groove extends radially inward along the annular wall, with the groove wall on the axial side of the annular wall abutting the annular platform surface axially.

[0011] In some embodiments, the diameter of the groove wall located radially outside the annular wall is equal to the diameter of the outer circular wall surface of the compressor housing.

[0012] In some embodiments, the diameter of the inner circular wall of the annulus is equal to the diameter of the outer circular wall of the upper support.

[0013] In some embodiments, the radial outer edge of the open-side end face of the annular wall is welded to the compressor housing.

[0014] The scroll compressor provided by this utility model has the following beneficial effects: From the axial projection perspective of the compressor housing, the outer circle of the mating end face of the upper bracket is radially outside the inner circular wall of the compressor housing. That is, the outer circular wall of the mating end face of the upper bracket has a portion protruding from the inner circular wall of the compressor housing. Thus, compared with the upper bracket in the prior art, the mating end face of the upper bracket in this utility model has a larger radial area, realizing the outward expansion of the radial space of the upper bracket. This is beneficial for the arrangement of the moving scroll with a larger diameter inside the upper bracket, meeting the design requirements of extending the number of scroll coils and the larger eccentricity of the scroll line, ensuring the feasibility of the large displacement design of the small-diameter scroll compressor. At the same time, since the mating end face of the upper bracket forms an indentation on the first end face of the compressor housing, the upper cover can form a sealed connection with the compressor housing at this position, reducing the assembly difficulty while improving the sealing effect. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the internal structure of the scroll compressor in an embodiment of this utility model; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 yes Figure 1 A three-dimensional structural diagram of the upper support frame; Figure 4 yes Figure 1 A three-dimensional structural diagram of the top cover.

[0017] The attached figures are labeled as follows: 1. Compressor housing; 2. Upper bracket; 21. Ring surface; 22. Bearing section; 3. Moving scroll; 4. Crankshaft; 5. Upper cover; 51. Ring wall; 511. Ring groove; 52. Suction pipe; 6. Stationary scroll; 61. Threaded connector; 71. Cross slip ring; 72. Lower bracket; 73. Lower support ring; 74. Motor; 75. Lower cover. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0020] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90° or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0021] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0022] See also Figures 1 to 4As shown, according to an embodiment of the present invention, a scroll compressor is provided, including a compressor housing 1, an upper support 2, a moving scroll 3, and a stationary scroll 6. The stationary scroll 6 is fastened onto the moving scroll 3. The compressor housing 1 is a hollow cylinder, with an upper cover 5 and a lower cover 75 respectively covering its two ends, thereby forming a sealed accommodating space inside the scroll compressor. The upper support 2 and the lower support 72 support a crankshaft 4 within this accommodating space. The crankshaft 4 is driven to rotate by a motor 74, and the stator of the motor 74 is interference-fitted to the inner circular wall of the compressor housing 1. On the surface, the motor rotor is fixedly mounted to the crankshaft 4. The upper bracket 2 has a mating end face that supports the stationary scroll 6. Specifically, a cross slip ring 71 is provided on the aforementioned mating end face. The cross slip ring 71 is located between the bottom end face of the moving scroll 3 and the aforementioned mating end face to achieve the purpose of preventing the moving scroll 3 from rotating. The stationary scroll 6 is fastened onto the moving scroll 3 with the two facing each other with a phase angle difference of 180°. The outer edge of the stationary scroll 6 is fixedly connected to the aforementioned upper bracket 2. When the aforementioned crankshaft 4 is driven to rotate, the moving scroll 3 is driven to translate and mesh with the stationary scroll 6. The compressor housing 1 is assembled into a series of mutually isolated, crescent-shaped, sealed cavities with continuously varying volumes. In one specific embodiment, the lower support 72 is fixed to the lower support ring 73 by screws, and the lower support ring 73 is then fixed to the inner circular wall of the compressor housing 1 by spot welding. When the compressor is running, the motor 74 drives the crankshaft 4 to rotate, and the crank of the crankshaft 4 drives the moving scroll 3 to move. Under the anti-rotation restriction of the cross slip ring 71, the moving scroll 3 performs translational motion around the center of the crankshaft 4 with a fixed radius e. The refrigerant entering from the suction pipe 52 (located on the upper cover 5) is drawn into the moving scroll. The refrigerant, after being compressed, is discharged from the exhaust port of the static volute 6 within the crescent-shaped intake chamber formed between the upper cover 5 and the static volute 6. It then enters the cavity (i.e., the exhaust chamber) between the upper cover 5 and the static volute 6, and further passes through the exhaust groove of the static volute 6 and the upper bracket 2 into the cavity between the upper bracket 2 and the motor 74. Part of it passes through the flow channel between the motor 74 and the compressor housing 1 into the lower end of the motor 74. Finally, the high-pressure exhaust refrigerant is discharged through the exhaust pipe (not labeled in the figure). The upper bracket 2 is coaxially arranged with the compressor housing 1, and its axial projection onto the compressor housing 1 (i.e.,...) Figure 1 (The projection of the compressor from a top or bottom view), the outer circle of the mating end face is located radially outside the inner circular wall of the compressor housing 1 and radially inside the outer circular wall of the compressor housing 1, and the upper bracket 2 is mounted on the first end face of the compressor housing 1 via the annular platform 21 (i.e., Figure 1 On the top side end face (as shown in the diagram).

[0023] In this technical solution, from the axial projection perspective of the compressor housing 1, the outer circle of the mating end face of the upper bracket 2 is located radially outside the inner circular wall of the compressor housing 1 and radially inside the outer circular wall of the compressor housing 1. That is, the outer circular wall of the mating end face of the upper bracket 2 has a portion protruding from the inner circular wall of the compressor housing 1, and this protruding portion is recessed inside the outer circular wall of the compressor housing 1. Thus, compared with the upper bracket in the prior art, the mating end face of the upper bracket 2 in this utility model has a larger radial area, realizing the outward expansion of the radial space of the upper bracket 2. This is beneficial for the arrangement of the larger diameter moving scroll 3 inside the upper bracket 2, meeting the design requirements of extending the number of scroll coils and the larger eccentricity of the scroll line, ensuring the feasibility of the large displacement design of the small-diameter scroll compressor. At the same time, since the mating end face of the upper bracket 2 forms an indentation on the first end face of the compressor housing 1, the upper cover 5 can form a sealed connection with the compressor housing 1 at this position, reducing the assembly difficulty while improving the sealing effect.

[0024] In some embodiments, the radial thickness of the annular platform 21 is d, and the radial thickness of the first end face of the compressor housing 1 is w, where w / 3≤d≤w / 2.

[0025] In this technical solution, the axial positioning support between the ring platform 21 and the first end face of the compressor housing 1 can ensure the reliability of the axial positioning support of the upper bracket 2.

[0026] In some embodiments, the upper support 2 also has a bearing portion 22 that rotates with the crankshaft 4. It is understood that a sliding bearing (also called a main bearing) may be provided in the bearing portion 22 to achieve pivot support for the crankshaft 4. The bearing portion 22 is located radially inside the annular platform 21, and the outer circular wall of the bearing portion 22 is welded to the inner circular wall of the compressor housing 1, for example, by spot welding.

[0027] In this technical solution, the upper bracket 2 is welded to the inner wall of the compressor housing 1 via the outer circumferential surface of the aforementioned bearing portion 22, which further ensures the reliability of the connection between the upper bracket 2 and the compressor housing 1, thereby ensuring the reliability of the compressor pump body shaft system.

[0028] In some embodiments, the axial thickness between the annular platform 21 and the mating end face of the stationary vortex disk 6 and the upper support 2 is H, where H ≥ 10 mm.

[0029] In this technical solution, ensuring the axial thickness of the mating end face can improve the support rigidity of the upper bracket 2, and at the same time, it is also conducive to improving the connection reliability of each component on the upper bracket 2.

[0030] In some embodiments, the outer edge of the stationary scroll 6 is fixedly connected to the upper bracket 2 via a threaded connector 61 (e.g., a screw). Generally, at least two of the aforementioned threaded connectors 61 are provided to ensure a reliable connection in the circumferential direction. Projected axially onto the compressor housing 1, each of the threaded connectors 61 is at least partially located within the annular area covered by the annular platform 21.

[0031] In this technical solution, each threaded connector 61 is positioned as close as possible to the aforementioned annular surface 21, so as to make full use of the radial outward expansion space of the upper bracket 2 to increase the diameter of the moving scroll 3 and the stationary scroll 6 mounted on it, thereby increasing the compressor displacement.

[0032] As mentioned above, the scroll compressor also includes an upper cover 5. The upper cover 5 has an annular wall 51 that covers the radially outer side of the upper support 2 and is sealed to the compressor housing 1. Specifically, the radially outer edge of the opening side end face of the annular wall 51 is welded to the compressor housing 1 to ensure the airtightness of the aforementioned accommodating space. It is understood that the mating position between the aforementioned lower cover 75 and the compressor housing 1 is also sealed by welding.

[0033] In some implementation methods, see details. Figure 4 As shown, an annular groove 511 extending around the central axis of the compressor housing 1 is formed on the open side end face of the annular wall 51, and the annular groove 511 extends radially inward along the annular wall 51, and the groove wall of the annular groove 511 in the axial direction of the annular wall 51 abuts against the annular platform surface 21 in the axial direction.

[0034] In this technical solution, an annular groove 511 is further formed on the open side end face of the annular wall 51 of the upper cover 5. The annular groove 511 and the annular platform 21 can form an axial abutment, which can realize the axial limiting and positioning of the assembly of the upper cover 5, facilitate the welding between the upper cover 5 and the compressor housing 1, and at the same time, the multiple curved mating surfaces formed between the annular groove 511 and the compressor housing 1 can be used to improve the sealing performance at the assembly and mating position of the two.

[0035] In some embodiments, the diameter of the groove 511 located on the radially outer side of the annular wall 51 is equal to the diameter of the outer circular wall of the compressor housing 1. In some embodiments, the diameter of the inner circular wall of the annular wall 51 is equal to the diameter of the outer circular wall of the upper bracket 2.

[0036] In this technical solution, by fitting the radial outer groove wall of the annular groove 511 to the outer circular wall of the compressor housing 1 and the inner circular wall of the annular wall 51 to the outer circular wall of the upper bracket 2, the components can be mutually limited, ensuring the positional reliability of each component, and further improving the sealing of the connection between the upper cover 5 and the compressor housing 1.

[0037] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A scroll compressor characterized by, The compressor housing includes a compressor housing (1), an upper bracket (2), a moving scroll (3), and a stationary scroll (6). The stationary scroll (6) is fastened to the moving scroll (3). The compressor housing (1) is a hollow cylinder. The upper bracket (2) has a mating end face that supports the stationary scroll (6). The upper bracket (2) is coaxially arranged with the compressor housing (1) and projected onto the axial direction of the compressor housing (1). The outer circle of the mating end face is located radially outside the inner circle wall of the compressor housing (1) and radially inside the outer circle wall of the compressor housing (1). The upper bracket (2) is mounted on the first end face of the compressor housing (1) via a ring platform (21).

2. The scroll compressor of claim 1, wherein The radial thickness of the annular platform (21) is d, and the radial thickness of the first end face of the compressor housing (1) is w, where w / 3≤d≤w / 2.

3. The scroll compressor of claim 1, wherein The upper bracket (2) also has a bearing portion (22) that rotates with the crankshaft (4). The bearing portion (22) is located radially inside the annular platform (21), and the outer circular wall of the bearing portion (22) is welded to the inner circular wall of the compressor housing (1).

4. The scroll compressor of claim 1, wherein The axial thickness between the annular platform (21) and the mating end face of the stationary vortex disk (6) and the upper support (2) is H, where H ≥ 10 mm.

5. The scroll compressor of claim 1, wherein, The outer edge of the static scroll (6) is fixedly connected to the upper bracket (2) via a threaded connector (61). Projected axially onto the compressor housing (1), each of the threaded connectors (61) is at least partially located within the annular area covered by the annular platform (21).

6. The scroll compressor of claim 1, wherein, It also includes an upper cover (5), which has an annular wall (51) covering the radially outer side of the upper bracket (2) and is sealed to the compressor housing (1).

7. The scroll compressor of claim 6, wherein An annular groove (511) extending around the central axis of the compressor housing (1) is formed on the open side end face of the annular wall (51), and the annular groove (511) extends radially inward along the annular wall (51), and the groove wall of the annular groove (511) on the axial side of the annular wall (51) abuts against the annular platform surface (21) axially.

8. The scroll compressor according to claim 7, characterized in that, The diameter of the groove (511) located on the radially outer side of the annular wall (51) is equal to the diameter of the outer circular wall of the compressor housing (1).

9. The scroll compressor of claim 6, wherein, The diameter of the inner circular wall of the ring wall (51) is equal to the diameter of the outer circular wall of the upper support (2).

10. The scroll compressor of claim 6, wherein, The radial outer edge of the opening side end face of the annular wall (51) is welded to the compressor housing (1).

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