Anti-rotation mechanism for scroll compressor

Abstract

The invention discloses an anti-rotation mechanism for a scroll compressor, and the anti-rotation mechanism comprises a movable scroll plate, the movable scroll plate is provided with a scroll part and a base plate, the base plate is provided with a rotation stopping base line, the rotation stopping base line is provided with a rotation stopping part, and the terminating end of the scroll part is provided with an arc-shaped flange; the static scroll plate is provided with a rotation stopping groove matched with the rotation stopping part and the flange; in the rotation process of the movable scroll plate, the at least two rotation stopping parts are meshed with the rotation stopping grooves; wherein the rotation stopping groove is provided with an enveloping surface matched with the rotation stopping part, the area, meshed with the enveloping surface, in the rotation stopping part is a meshing surface, and the meshing surface limits rotation of the movable scroll plate. The scroll plate is arranged on a body of a movable scroll plate and a body of a static scroll plate, the scroll plate and scroll structures on the movable scroll plate and the static scroll plate are machined together, other structures do not need to be arranged, centrifugal force generated when the compressor works is reduced, and assembly of other parts and assembly errors are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and particularly relates to an anti-rotation mechanism for a scroll compressor. Background Art

[0002] Scroll compressors have high volumetric efficiency, low operating noise, and long service life, and are widely used in the fields of refrigeration, heating, air compression, or vacuum equipment.

[0003] The anti-reverse mechanisms of existing scroll compressors often adopt the structure of a cross slip ring and a cylindrical pin. The cross slip ring and the cylindrical pin are arranged at the bottom of the moving scroll plate to restrict the reverse rotation of the moving scroll plate. However, such a structure requires multiple parts and mechanisms for anti-rotation, which are processed and assembled separately, and have high requirements for processing accuracy and assembly accuracy, resulting in large assembly errors. In addition, the use of a cross slip ring and a cylindrical pin leads to a large centrifugal force during the operation of the compressor. In order to reduce the centrifugal force, lightweight and small parts are preferably used, which reduces the strength of the cross slip ring or the cylindrical pin, and the product quality cannot be guaranteed. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an anti-rotation mechanism for a scroll compressor. The mechanism is arranged on the bodies of the moving scroll plate and the stationary scroll plate, is processed together with the scroll structures on the moving scroll plate and the stationary scroll plate, and does not require other structures, reducing the centrifugal force generated during the operation of the compressor and avoiding the assembly errors caused by assembling other components.

[0005] Specifically, the present invention discloses an anti-rotation mechanism for a scroll compressor, including:

[0006] A moving scroll plate, the moving scroll plate has a scroll portion and a bottom plate, and the bottom plate has a rotation-stop baseline, a rotation-stop portion is provided on the rotation-stop baseline, and the termination end of the scroll portion has an arc-shaped flange;

[0007] A stationary scroll plate, the stationary scroll plate has a rotation-stop groove that cooperates with the rotation-stop portion and the flange;

[0008] During the rotation of the moving scroll plate, at least two of the rotation-stop portions are engaged with the rotation-stop groove; wherein,

[0009] The rotation-stop groove has an envelope surface that cooperates with the rotation-stop portion, and the area of the rotation-stop portion that engages with the envelope surface is an engagement surface, and the engagement surface restricts the self-rotation of the moving scroll plate.

[0010] By adopting the above solution, a rotation prevention part is provided on the moving scroll disk, and a rotation prevention groove matching therewith is provided on the stationary scroll disk, so that the rotation prevention part and the moving scroll disk, and the rotation prevention groove and the stationary scroll disk are integrally formed, with high machining accuracy and avoiding assembly errors. During the rotation process of the moving scroll disk, at least two rotation prevention parts are engaged with the rotation prevention groove, and the engagement surface restricts the movement of the moving scroll disk. At the same time, the flange rotates in the rotation prevention groove and engages with the rotation prevention groove to prevent the moving scroll disk from rotating. The present invention cancels the cross slip ring mechanism and the cylindrical pin mechanism, reduces the centrifugal force during the operation of the compressor, reduces the noise generated during operation, and improves the service life of the compressor.

[0011] Furthermore, the cross-sectional shape of the rotation prevention part includes, but is not limited to, a circle and an ellipse.

[0012] Furthermore, one rotation prevention part has at least two engagement surfaces.

[0013] Furthermore, the envelope surface is the side wall of the rotation prevention groove, the included angle formed by the center connection lines at both ends of the envelope surface and the center of the rotation prevention groove is the envelope angle, and the included angle formed by the center connection lines at both ends of the engagement surface and the center of the rotation prevention part is the engagement angle.

[0014] Furthermore, the rotation prevention baseline is concentrically arranged with the moving scroll disk, evenly distributed on the chassis, and one rotation prevention part is provided on one rotation prevention baseline.

[0015] Even further, the number of the rotation prevention baselines is at least 3, the angle of the rotation prevention baseline is 0 - 40°, and the rotation prevention baseline is provided on the upper surface of the chassis.

[0016] Furthermore, two rotation prevention parts are in a group, and the included angle formed by the center connection line of each group of rotation prevention parts and the center of the moving scroll disk is 100° - 260°.

[0017] Furthermore, the envelope angle is 360°, and the engagement angle = 360° / the number of rotation prevention parts.

[0018] Even further, the number of the rotation prevention baselines is at least 5, and the angle of the rotation prevention baseline is 0 - 20°.

[0019] Furthermore, two rotation prevention parts are in a group, and the included angle formed by the center connection line of each group of rotation prevention parts and the center of the moving scroll disk is 120° - 240°.

[0020] Furthermore, the envelope angle = (360° + 180° × the number of rotation prevention parts) / the number of rotation prevention parts, and the engagement angle = 360° / the number of rotation prevention parts.

[0021] Furthermore, the rotation prevention baseline is provided on the side wall of the chassis.

[0022] Further, the anti-rotation baseline is respectively arranged on the upper surface of the chassis and the side wall of the chassis. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art.

[0024] Figure 1 is a schematic diagram of the meshing of the anti-rotation mechanism for a scroll compressor;

[0025] Figure 2 is a top view of the stationary scroll plate;

[0026] Figure 3 is a schematic diagram of the distribution of the first embodiment of the anti-rotation part;

[0027] Figure 4 is a schematic diagram of the distribution of the second embodiment of the anti-rotation part;

[0028] Figure 5 is a schematic diagram of the distribution of the third embodiment of the anti-rotation part;

[0029] Figure 6 is a top view of the third embodiment of the anti-rotation part;

[0030] Figure 7 is a partial enlarged view of the third embodiment of the anti-rotation part;

[0031] Figure 8 is a schematic diagram of the principle of the anti-rotation baseline arranged on the upper surface of the chassis;

[0032] Figure 9 is a schematic diagram of the principle of the anti-rotation baseline arranged on the side wall of the chassis;

[0033] Figure 10 is a schematic diagram of the meshing movement principle of the anti-rotation part and the anti-rotation groove;

[0034] Figure 11 is a schematic diagram of the best anti-reversal control point;

[0035] Figure 12 is a schematic diagram of the principle of the stability of the relative movement of the number, position of the anti-rotation part and the stationary scroll plate.

[0036] The reference numerals involved in the drawings are as follows: moving scroll plate 1, scroll part 11, flange 111, chassis 12, anti-rotation baseline 121, anti-rotation part 13, meshing surface 131, connecting part 132, stationary scroll plate 2, anti-rotation groove 21, envelope surface 211, scroll cavity 22, angle α of the anti-rotation baseline, meshing angle β, envelope angle γ. Detailed Description of the Embodiments

[0037] The present invention will be further described in detail below with reference to the drawings.

[0038] As shown Figures 1 - 12 in the figure, the present invention discloses an anti-rotation mechanism for a scroll compressor, including:

[0039] A moving scroll disk 1, the moving scroll disk 1 has a scroll part 11 and a chassis 12, and the chassis 12 has a rotation stopping baseline 121, a rotation stopping part 13 is provided on the rotation stopping baseline 121, and the termination end of the scroll part 11 has an arc-shaped flange 111;

[0040] A stationary scroll disk 2, the stationary scroll disk 2 has a rotation stopping groove 21 that cooperates with the rotation stopping part 13 and the flange 111;

[0041] During the rotation process of the moving scroll disk 1, at least two rotation stopping parts 13 are engaged with the rotation stopping groove 21; wherein,

[0042] The rotation stopping groove 21 has an enveloping surface 211 that cooperates with the rotation stopping part 13, and the area of the rotation stopping part 13 that is engaged with the enveloping surface 211 is an engagement surface 131, and the engagement surface 131 restricts the self-rotation of the moving scroll disk 1.

[0043] A rotation stopping part 13 is provided on the moving scroll disk 1, and a rotation stopping groove 21 that matches it is provided on the stationary scroll disk 2, so that the rotation stopping part 13 and the moving scroll disk 1, and the rotation stopping groove 21 and the stationary scroll disk 2 are integrally formed, improving the processing accuracy and reducing the assembly error. During the rotation process of the moving scroll disk 1, at least two rotation stopping parts 13 are engaged with the rotation stopping groove 21, the engagement surface 131 restricts the movement of the moving scroll disk 1, and at the same time the flange 111 is also engaged with the rotation stopping groove 21 to prevent the moving scroll disk 1 from rotating.

[0044] Compared with the prior art, the present invention cancels the cross slip ring mechanism and the cylindrical pin mechanism, reduces the centrifugal force during the operation of the compressor, reduces the noise generated during operation, improves the service life of the compressor, and improves the processing accuracy and reduces the assembly error.

[0045] Among them, the cross-sectional shape of the rotation stopping part 13 includes a circle, an ellipse, or other shapes with convex curve characteristics, as long as the operation is stable and the engagement angle β is within the set range, and the cross-sectional shape of the rotation stopping part 13 is not limited. In this embodiment, the cross-sectional shape of the rotation stopping part 13 is a circle.

[0046] In addition, one rotation stopping part 13 has at least two engagement surfaces 131, and the engagement surfaces 131 restrict the movement track of the moving scroll disk 1. The more the engagement surfaces 131 are, the higher the movement accuracy of the moving scroll disk 1 and the stationary scroll disk 2.

[0047] The enveloping surface 211 is the side wall of the rotation stopping groove 21, and the included angle formed by the center connection line of the two ends of the enveloping surface 211 and the rotation stopping groove 21 is the enveloping angle γ, and the included angle formed by the center connection line of the two ends of the engagement surface 131 and the rotation stopping part 13 is the engagement angle β.

[0048] In addition, the anti-rotation baseline 121 is concentrically arranged with the moving scroll disk 1 and evenly distributed on the chassis 12, and an anti-rotation portion 13 is provided on one anti-rotation baseline 121. The anti-rotation baselines 121 are evenly distributed on the chassis 12, so that the anti-rotation portions 13 are distributed around the chassis 12, and the anti-rotation portion 13 only needs to be on the anti-rotation baseline 121, which improves the flexibility of the setting of the anti-rotation portion 13.

[0049] As Figure 3 , 4 shown, the moving scroll disk 1 is a single-scroll structure. As Figure 5 shown, the moving scroll disk 1 is a double-scroll structure. This structure is applicable to more scenarios or different scroll compressors. In addition, this anti-rotation structure can also be used in scroll vacuum pumps.

[0050] In some embodiments of the present invention, the envelope angle γ is 360°, the meshing angle β is 360° / the number of anti-rotation portions, and the number of anti-rotation baselines 121 is at least 3. The angle α of the anti-rotation baseline is 0-40°. Two anti-rotation portions form a group, and the included angle formed by the connection line between the center of each group of anti-rotation portions and the center of the moving scroll disk is 100°-260°. Among them, the anti-rotation baseline 121 is provided on the upper surface of the chassis 12, far from the scroll portion 11.

[0051] In this solution, the anti-rotation groove 21 of the stationary scroll disk 2 is a circular groove matching the anti-rotation portion 13, and the position also matches the anti-rotation portion 13. The meshing surface 131 restricts the self-rotation of the moving scroll disk 1.

[0052] As Figure 10 shown, it is a schematic diagram of the meshing principle of the anti-rotation portion 13 and the anti-rotation groove 21 at any position. F is the force applied by the moving scroll disk 1. Each anti-rotation portion 13 applies the force F in the same direction to the corresponding anti-rotation groove 21, so that a force arm L1, L2, L3 is formed between the two anti-rotation portions. At this time, the force arm L1 is the largest. Therefore, the two anti-rotation portions 13 on the left are meshed with the anti-rotation groove 21, and the better the anti-rotation effect is when the force arm is larger, restricting the rotation of the moving scroll disk 1. When the moving scroll disk 1 rotates counterclockwise, the force F also rotates counterclockwise. At this time, the force arm L1, the force arm L2, and the force arm L3 all change. Each group of anti-rotation portions 21 alternately plays the maximum limiting role. When the moving scroll disk 1 rotates one week, the meshing angle β between the anti-rotation portion 13 and the anti-rotation groove 21 is affected by the number of anti-rotation portions 13. The more the number of anti-rotation portions 13, the smaller the meshing angle β of each anti-rotation portion 13.

[0053] During the rotation of the moving scroll disk 1, the rotation stopping portion 13 rotates in the rotation stopping groove 21 and cooperates with the envelope surface 211. When the engaging surface 131 of a set of rotation stopping portions 13 engages with the envelope surface 211, at least two engaging surfaces of the rotation stopping portions 13 engage with the envelope surface 211. At this time, the engaging surfaces 13 of the two rotation stopping portions 13 limit the rotation of the moving scroll disk 1. When the moving scroll disk continues to rotate, the engaging surface 131 of one of the rotation stopping portions 13 gradually disengages from the envelope surface 211, and at the same time, the engaging surface 131 of the next adjacent set of rotation stopping portions 13 gradually engages with the envelope surface 211, restricting the rotation of the moving scroll disk 1.

[0054] In some embodiments of the present invention, the meshing principle is the same as that of the above embodiments. The difference from the above embodiment lies in the envelope angle γ, the meshing angle β, and the number and position of the rotation stopping baselines 121. In this solution, the envelope angle γ and the rotation stopping baseline 121 satisfy: 360° / envelope angle γ - 180° = the number of rotation stopping portions. The meshing angle β is 360° / the number of rotation stopping portions. The number of rotation stopping baselines 121 is at least 5, and the angle α of the rotation stopping baseline is 0 - 20°.

[0055] Among them, two rotation stopping portions 13 form a set, and the included angle formed by the connection line between the centers of each set of rotation stopping portions 13 and the center of the moving scroll disk 1 is 120° - 240°.

[0056] In order to improve the meshing accuracy, the smaller the meshing angle β, the more the number of rotation stopping portions 21.

[0057] When the rotation stopping baseline 121 is provided on the side wall of the chassis 12, the rotation stopping portion 13 is transitionally connected to the scroll portion 11 and the chassis 12 through the connecting portion 132. When the rotation stopping baseline 121 is respectively provided on the upper surface and the side wall of the chassis 12, the rotation stopping portion 13 provided on the side wall of the chassis 12 is transitionally connected to the scroll portion 11 and the chassis 12 through the connecting portion 132.

[0058] In this solution, when the rotation stopping portion 13 is transitionally connected to the scroll portion 11 and the chassis 12 through the connecting portion 132, the rotation stopping groove 21 of the stationary scroll disk 2 communicates with the scroll cavity 22 of the stationary scroll disk 2. The position of the rotation stopping groove 21 matches the rotation stopping portion 13, and the engaging surface 131 restricts the self-rotation of the moving scroll disk 1.

[0059] The connecting portion 132 has an arc-shaped structure, which improves the connection strength between the rotation stopping portion 13 and the scroll portion 11 and the chassis 12. On the other hand, it can play the role of a reinforcing rib to improve the strength of the scroll portion 11. There is no restriction on the transition curve between the connecting portion 132 and the scroll portion 11, as long as it does not interfere with the rotation stopping groove 21.

[0060] Such as Figure 11As shown in the figure, when the connecting line of a group of anti-rotation parts 13 passes through the center of the moving scroll disk 1, that is, the included angle is 180°, at this time, the point where the meshing surface 131 of this group of anti-rotation parts 13 meshes with the envelope surface 211 forms the best control point for preventing reverse rotation. Line A is the connecting line when the meshing surface 131 of a group of anti-rotation parts 13 meshes with the envelope surface 211, line C is the connecting line between the center of the anti-rotation groove 21 and the outermost meshing point, line D is the connecting line between the center of the anti-rotation groove 21 and the innermost meshing point, and the included angle between line C and line D is the meshing angle β of the meshing surface 131.

[0061] During the rotation process of the moving scroll disk 1, some anti-rotation parts 13 rotate in the anti-rotation groove 21 and cooperate with the envelope surface 211, as Figure 11 shown. When the meshing surface 131 of one anti-rotation part 13 meshes with the envelope surface 211, another anti-rotation part 13 that is in a group with the current anti-rotation part 13 also meshes with the envelope surface 211. At this time, the meshing surfaces 13 of the two anti-rotation parts 13 limit the rotation of the moving scroll disk 1. When the moving scroll disk continues to rotate, the meshing surface 131 of the current group of anti-rotation parts 13 gradually disengages, and at the same time, the meshing surface 131 of the next adjacent group of anti-rotation parts 13 gradually meshes with the envelope surface 211, restricting the rotation of the moving scroll disk 1.

[0062] The following is the analysis of the relative motion stability principle between the number and distribution position of the anti-rotation parts 13 of the moving scroll disk 1 and the stationary scroll disk 2:

[0063] As Figure 12 shown, the anti-rotation parts 13 are evenly distributed on the maximum design radius. Among them, R is the maximum design radius of the moving scroll disk 1, Lmax is the maximum effective force arm of a rotation cycle of the moving scroll disk 1, Lmin is the minimum effective force arm of a rotation cycle of the moving scroll disk 1, and (Lmax + Lmin) / 2 is the average force arm.

[0064] When the number of anti-rotation parts 13 is odd, Lmax is the line segment between the two farthest anti-rotation parts, and Lmin is the perpendicular line segment passing through one anti-rotation part (one of the two farthest anti-rotation parts) and perpendicular to the connecting line between the anti-rotation part with the farthest distance from it and the anti-rotation part with the farthest adjacent distance from it; when the number of anti-rotation parts 13 is even, Lmax is the line segment between the two farthest anti-rotation parts, and Lmin is the line segment between one anti-rotation part (one of the two farthest anti-rotation parts) and the anti-rotation part with the farthest adjacent distance from it.

[0065] When the number of anti-rotation parts 13 is 3: Lmax = 2 * R * sin60° ≈ 1.73R, Lmin = Lmax * sin60° = 1.5R, (Lmax + Lmin) / 2 ≈ 1.6R;

[0066] When the number of anti-rotation parts 13 is 4: Lmax = 2R, Lmin = 2 * R * sin45° ≈ 1.4R, (Lmax + Lmin) / 2 ≈ 1.7R;

[0067] When the number of anti-rotation parts 13 is 5: Lmax = 2 * R * cos18° ≈ 1.9R, Lmin = 2 * R * cos18° * cos18° ≈ 1.8R, (Lmax + Lmin) / 2 ≈ 1.85R;

[0068] When the number of anti-rotation parts 13 is 6: Lmax = 2R, Lmin = 2 * R * sin60° ≈ 1.73R, (Lmax + Lmin) / 2 ≈ 1.865R.

[0069] It can be seen that the larger the number of anti-rotation parts 13, the smaller the fluctuation value of the average force arm. And after the number of anti-rotation parts 13 is more than 5, for each additional anti-rotation part 13, the increase value of the average force arm is very small. Therefore, when the number of anti-rotation parts is 5 or more, the movement of the moving scroll disk 1 is more stable.

[0070] For those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An anti-rotation mechanism for a scroll compressor, characterized in that Comprising: A moving scroll disk (1), the moving scroll disk (1) having a scroll portion (11) and a chassis (12), and the chassis (12) having a rotation stopping baseline (121), a rotation stopping portion (13) being provided on the rotation stopping baseline (121), and the termination end of the scroll portion (11) having an arc-shaped flange (111); A stationary scroll disk (2), the stationary scroll disk (2) having a rotation stopping groove (21) that cooperates with the rotation stopping portion (13) and the flange (111); During the rotation process of the moving scroll disk (1), at least two of the rotation stopping portions (13) engage with the rotation stopping groove (21); wherein, The rotation stopping groove (21) has an enveloping surface (211) that cooperates with the rotation stopping portion (13), and the area of the rotation stopping portion (13) that engages with the enveloping surface (211) is the engaging surface (131), and the engaging surface (131) restricts the self-rotation of the moving scroll disk (1).

2. The anti-rotation mechanism for a scroll compressor according to claim 1, characterized in that, The cross-sectional shape of the rotation stopping portion (13) includes but is not limited to a circle and an ellipse.

3. The anti-rotation mechanism for a scroll compressor according to claim 2, characterized in that, One of the rotation stopping portions (13) has at least two of the engaging surfaces (131).

4. The anti-rotation mechanism for a scroll compressor according to claim 3, characterized in that, The enveloping surface (211) is the side wall of the rotation stopping groove (21), and the angle formed by the connection line between the two ends of the enveloping surface (211) and the center of the rotation stopping groove (21) is the enveloping angle (γ), and the angle formed by the connection line between the two ends of the engaging surface (131) and the center of the rotation stopping portion (13) is the engaging angle (β).

5. The anti-rotation mechanism for a scroll compressor according to claim 4, characterized in that, The rotation stopping baseline (121) is concentrically arranged with the moving scroll disk (1), evenly distributed on the chassis (12), and one rotation stopping portion (13) is provided on one rotation stopping baseline (121).

6. The anti-rotation mechanism for a scroll compressor according to claim 5, characterized in that, The number of the rotation stopping baselines (121) is at least 3, the angle (α) of the rotation stopping baseline is 0 - 40°, and the rotation stopping baseline (121) is provided on the upper surface of the chassis (12).

7. The anti-rotation mechanism for a scroll compressor according to claim 6, characterized in that, Two of the rotation stopping portions (13) form a group, and the angle formed by the connection line between the centers of each group of rotation stopping portions (13) and the center of the moving scroll disk (1) is 100° - 260°.

8. The anti-rotation mechanism for a scroll compressor according to claim 7, characterized in that, The enveloping angle (γ) is 360°, and the engaging angle (β) = 360° / the number of rotation stopping portions.

9. The anti-rotation mechanism for a scroll compressor according to claim 5, wherein, The number of the rotation stopping baselines (121) is at least 5, and the angle (α) of the rotation stopping baseline is 0 - 20°.

10. The anti-rotation mechanism for a scroll compressor according to claim 9, wherein, Two of the rotation stopping portions (13) form a group, and the angle formed by the connection line between the centers of each group of rotation stopping portions (13) and the center of the moving scroll disk (1) is 120° - 240°.

11. The anti-rotation mechanism for a scroll compressor according to claim 10, characterized in that, The enveloping angle (γ) = (360° + 180° × the number of rotation stopping portions) / the number of rotation stopping portions, and the engaging angle (β) = 360° / the number of rotation stopping portions.

12. The anti-rotation mechanism for a scroll compressor according to claim 11, wherein, The rotation stopping baseline (121) is provided on the side wall of the chassis (12).

13. The anti-rotation mechanism for a scroll compressor according to claim 12, characterized in that, The rotation stopping baseline (121) is provided on the upper surface and the side wall of the chassis (12).

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