Axially flexible scroll compressor

Abstract

The invention relates to the technical field of scroll compressor manufacturing, in particular to an axial flexible scroll compressor. The scroll compressor comprises a fixed scroll, a high-low pressure partition plate, a sealing ring, a movable scroll, a cross ring, an upper support and a crankshaft, a cross ring, a movable vortex and a fixed vortex are sequentially assembled at the upper part of the upper support; a high-low pressure partition plate is arranged between the fixed scroll and the compressor shell; a sealing ring is arranged between the fixed vortex and the high-low pressure partition plate; the crankshaft penetrates through the upper support and is connected with the movable vortex; the fixed vortex and the upper support are fixed through high back pressure instead of bolts; a key groove ring is arranged between the fixed vortex and the upper support; the key groove ring is positioned and fixedly arranged on the upper support through a bolt and a positioning pin; the fixed vortex and the key groove ring are in sliding fit in the axial direction through key groove fit; the cross-shaped ring is matched with the key groove of the key groove ring and the key groove of the movable vortex to limit the autorotation motion of the movable vortex and ensure that the movable vortex is driven by the crankshaft to rotate and translate. According to the technical scheme, the problem of axial leakage of a scroll compressor in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of scroll compressor manufacturing technology, and more particularly to an axially flexible scroll compressor. Background Technology

[0002] Scroll compressors are positive displacement compressors developed in the 1970s. They are characterized by high efficiency, low noise, simple structure, and stable operation, and are widely used in various air conditioning units.

[0003] A scroll compressor is mainly composed of moving and fixed scrolls, a crankshaft, a motor, and a housing. The moving and fixed scrolls have scroll teeth that are 180° apart. The fixed scroll is usually fixed on the main support structure, and the moving scroll meshes with it. Through a cross-ring structure, the moving scroll can only move in translation and cannot rotate under the action of the crankshaft, thus forming crescent-shaped pressure chambers of different sizes to compress the gas.

[0004] In this process, the fixed scroll is usually fixed with bolts, which results in poor resistance to liquid slugging during the compression process and leakage. Gas will leak from the tooth side (radial direction) and tooth tip (axial direction) of the scroll. Now many compressors use medium pressure to achieve axial flexibility in order to solve the problems of compressor resistance to liquid slugging and energy efficiency.

[0005] In view of the problems existing in the above-mentioned prior art, it is necessary to research and design a new type of axial flexible scroll compressor to overcome the problems existing in the prior art. Summary of the Invention

[0006] In view of the technical problem of axial leakage in the existing scroll compressors mentioned above, an axially flexible scroll compressor is provided.

[0007] The technical means employed in this invention are as follows: An axially flexible scroll compressor includes: a fixed scroll, a high-low pressure partition, a sealing ring, a moving scroll, a cross ring, and an upper support; the upper part of the upper support is sequentially equipped with the cross ring, the moving scroll, and the fixed scroll; a high-low pressure partition is provided between the fixed scroll and the compressor housing; a sealing ring is provided between the fixed scroll and the high-low pressure partition; a crankshaft passes through the upper support and is connected to the moving scroll; Furthermore, the fixed vortex and the upper support are not fixed with bolts, but are fixed by high back pressure; Furthermore, a keyway ring is provided between the fixed vortex and the upper support; Furthermore, the keyway ring is fixedly mounted on the upper support by bolts and locating pins; Furthermore, the fixed vortex and the keyway ring achieve a sliding fit in the axial direction through the keyway fit; Furthermore, the cross ring, through its cooperation with the keyway ring and the keyway of the moving scroll, restricts the rotational motion of the moving scroll, ensuring that the moving scroll rotates and translates under the drive of the crankshaft.

[0008] Furthermore, the keyway ring is a ring structure, on which a square keyway, an in-slot key, a bolt hole A, an air intake opening and a pin hole A are provided; Furthermore, there are three square keyways, arranged at a 120° angle on the upper end face of the keyway ring, for mating with the key on the fixed scroll. Furthermore, there are two keys in the groove, symmetrically arranged on the bottom end face of the keyway ring, for mating with the cross-shaped open keyway; Furthermore, the intake opening is located on the keyway ring with the opening facing upwards, which facilitates vortex intake. Furthermore, bolt hole A and pin hole A are provided on the upper end face of the keyway ring for positioning and assembly with the upper support.

[0009] Furthermore, the fixed vortex no longer has the function of fixing the cross ring; Furthermore, three square keys with an included angle of 120° are provided on the outer circumferential surface of the fixed vortex; Furthermore, the fixed vortex is constrained axially and radially by the square key engaging with the square keyway of the keyway ring.

[0010] Furthermore, the square key and the keyway ring have a certain degree of perpendicularity and flatness requirements in their planar contact.

[0011] Furthermore, the gap between the square key and the square keyway is 10-20 μm to reduce radial leakage of the vortex teeth.

[0012] Furthermore, two open keyways are symmetrically arranged on the outer wall of the cross ring; Furthermore, the open keyway engages with the key inside the slot, and the cross ring is restricted to move parallel to the keyway ring through the keyway ring.

[0013] Furthermore, the upper support is a stepped cylindrical structure with three sets of bolt holes B and pin holes B that mate with the keyway ring.

[0014] Furthermore, since the upper support needs to withstand pressure, it must have a certain degree of welding strength and resistance to deformation.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The axial flexible scroll compressor provided by the present invention uses high back pressure to fix the fixed scroll, which saves the components of the related medium pressure chamber compared with the medium pressure fixed structure, and also eliminates the processing of the medium pressure hole of the fixed scroll, thus reducing costs. 2. The axial flexible scroll compressor provided by the present invention is designed with a fixed scroll consisting of three square keys with an included angle of 120°. The three square keys can control the axial sliding of the fixed scroll, while also restricting the rotation of the circumferential fixed scroll, thus possessing high resistance to liquid slugging. 3. The axial flexible scroll compressor provided by the present invention eliminates the function of fixing the cross ring of the fixed scroll. It designs an annular keyway that integrates the control of the axial floating of the fixed scroll and the horizontal movement of the cross ring, thereby reducing the impact of the cross ring movement on the fixed scroll.

[0016] In summary, the technical solution of this invention solves the problem of axial leakage in existing scroll compressors. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the structure of the present invention; Figure 2 This is a three-dimensional view of the structure of the present invention; Figure 3 This is an exploded view of the structure of the present invention; Figure 4 This is a three-dimensional view of the fixed vortex of the present invention; Figure 5 This is a three-dimensional view of the keyway ring of the present invention; Figure 6 This is a three-dimensional view supported by the present invention; Figure 7 This is a three-dimensional view of the cross ring of the present invention.

[0019] In the diagram: 1. Fixed scroll 11. Square key 12. Valve seat surface 2. High and low pressure baffle 3. Sealing ring 4. Moving scroll 5. Bolt 6. Cross ring 61. Square key 62. Open keyway 7. Keyway ring 71. Square keyway 72. In-slot key 73. Bolt hole A 74. Suction opening 75. Pin hole A 8. Locating pin 9. Upper support 91. Mirror surface 92. Bolt hole B 93. Pin hole B 10. Crankshaft. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, 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 invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0024] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention 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 invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0025] For ease of description, spatial relative terms such as "above," "over," "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 besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" 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 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0026] 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 should not be construed as limiting the scope of protection of this invention.

[0027] As shown in the figure, the present invention provides an axial flexible scroll compressor, comprising: a fixed scroll 1, a high-low pressure partition 2, a sealing ring 3, a moving scroll 4, a cross ring 6, an upper support 9, and a crankshaft 10; the upper part of the upper support 9 is sequentially equipped with the cross ring 6, the moving scroll 4, and the fixed scroll 1; the high-low pressure partition 2 is provided between the fixed scroll 1 and the compressor housing; the sealing ring 3 is provided between the fixed scroll 1 and the high-low pressure partition 2; the crankshaft 10 passes through the upper support 9 and is connected to the moving scroll 4; The fixed scroll 1 has three square keys 11 with an included angle of 120°. The fixed scroll 1 cooperates with the square keyway 71 of the keyway ring 7 through the three square keys 11, so that it can slide axially and fix the center of the fixed scroll 1 and the moving scroll 4 in the circumferential direction. The valve seat surface 12 of the fixed scroll 1 has a certain area for pressing the axial position of the fixed scroll 1 by high back pressure during operation. The axial sliding distance of the fixed scroll 1 is limited by the high and low pressure baffles 2, and the sliding distance is 0.1~0.4mm.

[0028] Both the moving vortex 4 and the fixed vortex 1 are equipped with tooth tip sealing rings. A gap of 0.05~0.1mm should be left between the tooth tips of the moving vortex 4 and the fixed vortex 1 to prevent excessive back pressure from causing deformation of the tooth tip of the fixed vortex 1 and ultimately resulting in abnormal wear.

[0029] The keyway ring 7 is a ring structure, which is fixed to the plane of the upper support 9 by six M8 bolts 5 and three locating pins 8. Above the keyway ring 7 are three square keyways 71 with an included angle of 120°, used to mate with the 120° square key 11 of the fixed scroll 1, wherein the gap between the square key 11 and the square keyway 71 is 10~20μm; below the keyway ring 7 are two in-slot keys 72, used to mate with the open keyway 62 of the cross ring 6. During assembly, the position of the cross ring 6 can be directly determined by the in-slot keys 72.

[0030] The cross ring 6 is a mechanism for controlling the rotation of the moving scroll 4. It has two pairs of square keys 61 and open keyways 62. The square keys 61 are used to cooperate with the moving scroll 4, and the open keyways 62 are used to cooperate with the key 72 in the groove of the keyway ring 7.

[0031] The upper support 9 is a stepped disc structure with six M8 threaded holes B92 and pin holes B93 for fixing and keyway ring 7, as well as a mirror surface 91 for mating with the moving scroll 4. The mirror surface 91 must have certain flatness and roughness requirements.

[0032] During assembly, firstly, the crankshaft 10 is welded and fixed to the upper support 9. Then, the moving scroll 4 is assembled with the square key 61 of the cross ring 6 onto the mirror surface 91 of the upper support 9. By slightly rotating the scroll 4, the key 72 in the groove below the keyway ring 7 is aligned with the open keyway 62 of the cross ring 6. Then, the keyway ring 7 is fixed with the locating pin 8 and M8 bolt 5. Next, the stationary scroll 1 is aligned with the three square keyways 71 of the keyway ring 7 at 120° angles. The crankshaft 10 is rotated until the stationary scroll 1 can smoothly engage with the keyway ring 7. Finally, the assembly is completed by installing the sealing ring 3 and the high and low cover partition 2.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An axially flexible scroll compressor, comprising: The compressor comprises a fixed scroll (1), a high-low pressure partition (2), a sealing ring (3), a moving scroll (4), a cross ring (6), an upper support (9), and a crankshaft (10); the upper part of the upper support (9) is sequentially equipped with a cross ring (6), a moving scroll (4), and a fixed scroll (1); a high-low pressure partition (2) is provided between the fixed scroll (1) and the compressor housing; a sealing ring (3) is provided between the fixed scroll (1) and the high-low pressure partition (2); the crankshaft (10) passes through the upper support (9) and connects to the moving scroll (4); its features are: The fixed vortex (1) and the upper support (9) are not fixed with bolts, but are fixed by high back pressure; A keyway ring (7) is provided between the fixed vortex (1) and the upper support (9); The keyway ring (7) is fixedly mounted on the upper support (9) by bolts (5) and positioning pins (8); The fixed vortex (1) and the keyway ring (7) achieve a sliding fit in the axial direction through the keyway fit; The cross ring (6) restricts the rotation of the moving vortex (4) by cooperating with the keyway ring (7) and the keyway of the moving vortex (4), ensuring that the moving vortex rotates and translates under the drive of the crankshaft.

2. The axial flexible scroll compressor according to claim 1, characterized in that: The keyway ring (7) is an annular structure, and is provided with a square keyway (71), an in-slot key (72), a bolt hole A (73), an air intake opening (74), and a pin hole A (75). The square keyway (71) consists of three sections, which are set at a 120° angle on the upper end face of the keyway ring (7) for mating with the key on the fixed vortex (1); The groove key (72) consists of two parts, symmetrically arranged on the bottom end face of the keyway ring (7), for cooperating with the keyway of the cross ring (6); The air intake opening (74) is set on the keyway ring (7), with the opening facing upward, which facilitates the intake of air by a fixed vortex; The bolt hole A (73) and pin hole A (75) are located on the upper end face of the keyway ring (7) and are used for positioning and assembly with the upper support (9).

3. The axially flexible scroll compressor according to claim 1, characterized in that: The fixed vortex (1) no longer has the function of fixing the cross ring (6); The outer circumferential surface of the fixed vortex (1) is provided with three square keys (11) with an included angle of 120°. The fixed vortex (1) is defined by the cooperation of a square key (11) and a square keyway (71) to limit the axial and radial directions of the fixed vortex (1).

4. The axially flexible scroll compressor according to claim 3, characterized in that: The gap between the square key (11) and the square keyway (71) is 10-20 μm to reduce radial leakage of the vortex teeth.

5. The axially flexible scroll compressor according to claim 1, characterized in that: Two open keyways (62) are symmetrically arranged on the outer wall of the cross ring (6); The open keyway (62) cooperates with the key (72) inside the slot, and the cross ring (6) is restricted to move in parallel by the keyway ring (7).

6. The axially flexible scroll compressor according to claim 1, characterized in that: The upper support (9) is a stepped cylindrical structure with three sets of bolt holes B (92) and pin holes B (93) that cooperate with the keyway ring (7).

7. The axially flexible scroll compressor according to claim 1, characterized in that: The upper support (9) needs to bear pressure, so it must have a certain welding strength and resistance to deformation.

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