Sealing structure and scroll compressor with same

Abstract

The utility model discloses a sealing structure, which comprises at least two sealing elements, a plurality of sealing elements and a plurality of sealing elements, the sealing piece is provided with a first top surface and a first cross section, and the width of the top surface in the first direction and the width smaller than or equal to the width of the cross section in the first direction have a first difference value; the first top faces of the sealing pieces are used for being in direct contact with the first contact faces to form sealing of the first end faces, so that the two sealing pieces can be installed in a direct or indirect abutting mode, and a first interval space can be formed between the two sealing pieces. The first interval space is positioned between a plane propped against the two first sections and the first contact surface; and the sealing air cavity is all or part of the first interval space. According to the scroll compressor, the dustproof sealing effect of the scroll compressor is effectively improved, the damping buffering effect of the scroll compressor is effectively improved, and high-purity gas pollution caused by abrasion of a sealing structure is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field, concretely relates to a sealing structure and scroll compressor with it. BACKGROUND

[0002] At present, the compressor is the core equipment of modern industrial pneumatic system, and is a driven fluid machine for lifting low-pressure gas into high-pressure gas. The scroll air compressor is a kind of machine without reciprocating mechanism, mainly relying on scroll to compress air, and its structure is simple, small in size, light in weight and easy to realize automation, so it is widely used.

[0003] However, the scroll compressor still has the following defects when applied to compress gas:

[0004] The scroll compressor drives the dynamic scroll disc by the rotation of the transmission shaft, so as to lift the low-pressure gas into high-pressure gas. However, during the operation of the scroll compressor, due to repeated rotation, the end face of the dynamic scroll disc repeatedly rubs against the sealing strip, which may cause the following problems: the sealing strip may be displaced under long-time working condition; long-time friction may cause wear on the top of the sealing strip, and external gas may leak into the scroll compressor; high-frequency rotation may cause vibration, thereby reducing the sealing property of the sealing structure and the service life of the machine body. In this way, the sealing effect of the scroll compressor is greatly reduced. Especially when compressing high-purity gas, the high-purity gas is contaminated due to the reduced sealing effect. UTILITY MODEL CONTENTS

[0005] In view of at least one defect or improvement requirement of the prior art, the utility model provides a sealing structure and scroll compressor with the same to improve the sealing property of the scroll compressor.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme. The utility model discloses a sealing structure, which comprises:

[0007] At least two sealing members, the sealing members are arranged in a first direction;

[0008] The sealing member has a first top surface and a first cross section, and the width of the top surface in the first direction and the width of the cross section in the first direction have a difference;

[0009] The first top surface of the sealing member is used for directly contacting the first contact surface to form the sealing of the first end face, and the two sealing members are directly or indirectly abutted and installed to form a first spacing space; the first spacing space is located between the plane abutted by the two first cross sections and the first contact surface; the difference of each sealing member in the two sealing members is the same or different;

[0010] The sealing gas cavity is for all or part of the first spacing space.

[0011] Further, the first direction is a direction in which a relative movement between the first top surface and the first contact surface generates an air gap in which gas flows in or out.

[0012] Further, the sealing structure forms a seal of the outer periphery of the one sealing area on the first contact surface in a continuous manner.

[0013] The seal of the outer periphery is formed in an intermittent manner.

[0014] Further, the difference is the same and is negative, and the width of the first top surface in the first direction is smaller than the width of the cross section in the first direction.

[0015] Further, the difference is the same and is positive, and the width of the first top surface in the first direction is greater than the width of the cross section in the first direction.

[0016] Further, the difference is not the same, and the difference of one sealing member is negative or 0, and the difference of the other sealing member is positive or 0.

[0017] Further, the sealing structure is used to be installed in a mounting groove, and a first sealing member of the sealing members is attached to a first surface of the mounting groove, and a last sealing member of the sealing members is attached to a second surface of the mounting groove.

[0018] Further, two side surfaces of the sealing gas cavity are parallel or not parallel.

[0019] Further, the sealing structure is U-shaped or V-shaped.

[0020] The utility model discloses a kind of scroll compressors with sealing structure, the scroll compressor includes static scroll and dynamic scroll, and the scroll line outer circumference of the static scroll or dynamic scroll is provided with at least one mounting groove, and the sealing structure as above is installed in the mounting groove.

[0021] The first top surface is used for direct or indirect contact with the first contact surface, and the first cross section is a relative cross-sectional plane forming the bottom surface of the sealing gas cavity, so as to arrange the sealing state of the sealing structure.

[0022] The specific shape of the sealing member has different widths of the first top surface and the first cross section in the first direction arrangement direction, so that, in the state of direct abutment or indirect abutment, the two sealing members can generate the first spacing space due to the different widths.

[0023] For example, the first top surface of one seal does not contact the first top surface of another seal due to the difference in width. However, the first cross section of one seal and the first cross section of another seal directly or indirectly abut against each other. The first cross section of one seal and the first cross section of another seal are set on the same plane, such as the second contact surface. Whether they are held in a facing position or in a position opposite to the facing position, the width difference between the two forms a first gap space.

[0024] For example, the first top surface of one seal may be in direct or indirect contact with the first cross-section of another seal due to the difference in width. However, the first cross-section of one seal and the first top surface of another seal may be in direct or indirect contact. The first cross-section of one seal and the first top surface of another seal may be disposed on the same plane, such as the second contact surface. Whether they are held in a facing position or in a position opposite to the facing position, the width difference between the two seals in contact or non-contact forms a first gap space.

[0025] Furthermore, between the two seals, the first cross-section is directly or indirectly arranged in the first direction and abuts against each other; or, the first cross-section and the first top surface are directly or indirectly arranged in the first direction and abut against each other.

[0026] Furthermore, between the two seals, the first cross-section and the first cross-section are attached to the same surface and arranged in the first direction for abutment installation, thereby securing the opposite sides of the first gap space.

[0027] Both sides are: the first top edge of the first top surface, the second top edge of the first cross section, and the connecting surface between the first top edge and the second top edge.

[0028] In summary, compared with the prior art, the above-described technical solution conceived by this utility model can achieve the following beneficial effects:

[0029] (1) The at least two sealing strips and sealing air chamber provided by this utility model can enable the sealing structure to form a micro-pressure sealing air chamber when the scroll compressor is working, thereby overcoming the leakage problem caused by friction and deformation of the single sealing strip in the prior art and improving the sealing effect of the scroll compressor.

[0030] (2) This utility model further adopts sealing components with different structures to form a sealing structure. A single sealing structure can be formed as an asymmetrical structure, so as to correspond to different mechanical requirements in the design and to strengthen the elastic design and strength design of the working side, and to achieve a better sealing effect in conjunction with the sealing air cavity.

[0031] (3) the top tight part has better elasticity than the sealing strip, can reduce the vibration of the scroll compressor during working, and improves the sealing and damping performance. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0033] Figure 1 The overall schematic view of the sealing structure provided by the embodiment of the present application (two sealing piece sections are shown);

[0034] Figure 2 The abutting schematic view of the L-shaped sealing piece and another sealing piece with an inner recess;

[0035] Figure 3 The abutting schematic view of another L-shaped sealing piece and another sealing piece with an inner recess;

[0036] Figure 4 The abutting schematic view of two L-shaped sealing pieces;

[0037] Figure 5 The overall schematic view of the sealing structure provided by the embodiment of the present application;

[0038] Figure 6 The cross-sectional view of the sawtooth-shaped top tight piece and the sealing piece integrally formed provided by the embodiment of the present application;

[0039] Figure 7 The cross-sectional view of the hollow cylindrical top tight piece and the sealing piece as two separate components provided by the embodiment of the present application;

[0040] Figure 8 The cross-sectional view of the limiting piece fixedly installed on the second contact surface;

[0041] Figure 9 The cross-sectional view of the limiting piece as the protruding structure of the second contact surface;

[0042] Figure 10 The top view of the installation groove provided on the scroll compressor static disc according to the embodiment of the present application;

[0043] Figure 11 The cross-sectional view of the installation groove provided with the protruding structure. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model will be described in further detail below in combination with the drawings and examples.

[0045] The terms "first", "second", "third" and the like in the description and claims of the utility model and the above drawings are used to distinguish different objects, and are not used to describe a specific order.

[0046] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model, and the described examples are only possible technical implementations of the utility model, and not all possible implementations.

[0047] In the prior art of the device that needs to be sealed by the sealing structure, the sealing structure in the prior art is a single sealing structure, which is directly placed in the space that needs to be sealed in contact in the device, or is placed in the groove arranged on one surface of two components. Although this structure can achieve a certain sealing effect, leakage still occurs. Especially when the two components are relatively displaced or rotated, the sealing element will be displaced, and because the two objects will rub against the sealing element, the sealing element will be worn and deformed after a long time, so that the sealing structure cannot achieve the sealing effect.

[0048] As shown in Figure 1 In the first embodiment of the utility model, in order to improve the sealing effect of the sealing structure, the prior art is improved. The utility model is a sealing structure, which comprises a plurality of sealing elements that are the same or different in structure in the overall form, and the plurality of sealing elements are arranged in a first direction. The sealing element has a first top surface and a first cross section, and the width of the first top surface in the first direction is less than or equal to the width of the first cross section in the first direction. So that the sealing elements that are the same or different in structure can form a certain gap in the abutment arrangement in the first direction.

[0049] The first top surface of the sealing element directly contacts the first contact surface to form the sealing of the first end face, so that the two sealing elements can be directly or indirectly abutted and installed, and a first spacing space can be formed between the two sealing elements. The sealing gas cavity is all or part of the first spacing space.

[0050] AsFigure 1 In the specific embodiment shown, the structure having the first spacing space is directly formed by abutting two seals, one of which is a structure in which the width of the first top surface in the first direction is equal to the width of the first cross section, and the other is a structure in which the width of the first top surface in the first direction is less than the width of the first cross section. In this way, when the two abut, the first spacing space between them is formed, and the two first cross sections abut at the bottom surface of the sealed gas cavity, and a part of the cross section of the other seal is the bottom surface of the sealed gas cavity.

[0051] In this embodiment, there are various ways in which the two seals directly or indirectly abut, and two seals are taken as an example, Figure 2 、 Figure 3 、 Figure 4 are cross-sectional schematic diagrams of different abutting modes of the seal: as shown in Figure 2 , the first spacing space formed after the abutment or lapping of two seals with completely different shapes.

[0052] As shown in Figures 4-5 , in the second embodiment of the utility model, the sealing structure comprises: two L-shaped seals abutting in opposite directions to form a U-shaped sealing structure, and the U-shaped seals are arranged in the first direction, or directly or indirectly abut each other. In this way, the U-shaped space forms the first spacing space. The sealed gas cavity is all or part of the first spacing space. The U-shaped seal has a U-shaped cross section, and the cross section of the sealing unit is approximately U-shaped, including but not limited to a concave shape.

[0053] The first direction indicated by the arrangement direction of the seals is the direction of the inflow or outflow of the gas, that is, when the top surface of the seal contacts the first contact surface, an air gap is generated between the two due to relative movement, and the exchange of the gas inside and outside the device occurs, and the direction of the mutual flow of the gas is the first direction. The first direction is an indicative direction and does not actually represent the continuous and continuous inflow or outflow of the gas.

[0054] When the sealing structure is arranged in a device that needs to be sealed, the surfaces of two parts of the device that need to be covered are in close contact with the seals, and the surfaces of the two parts are the first contact surface and the second contact surface as shown in Figure 1 、 5 , and at the same time, the sealing structure forms a seal around the outer periphery of a sealing area on the first contact surface in a continuous manner; or forms a seal around the outer periphery in a lapping contact manner in the second direction, so as to form a closed space for the sealed gas cavity.

[0055] Further, in order to improve the damping effect of the sealing structure, so that the sealing structure can better adapt and buffer when subjected to pressure or vibration, the sealing structure of the first and second embodiments of the utility model can be provided with a pressing component. When the device different parts cover, the sealing member pressing component is extruded to deform, which can adapt to different pressure changes, and has good damping and sealing effect, which ensures the efficient and stable operation of the required sealing device.

[0056] From the cross-sectional view of the sealing structure, the pressing member is arranged between the sealing member and the first contact surface, and the elastic constant thereof is different from that of the sealing member, so that good damping effect can be achieved. The pressing component can be integrally formed with the sealing member, that is, the sealing member itself is processed, and various shapes of elastic structures that can support are directly processed at the cross-sectional position of the sealing member, which can meet the requirement of having certain elasticity in the vertical direction, such as cylindrical shape, zigzag shape, etc. Figure 6 The zigzag pressing component is processed at the bottom of the sealing member. It can also be two separate components with the sealing structure, and the shape of the elastic structure can be any shape, such as hollow circular tube, such as Figure 7 .

[0057] Further, in order to facilitate the installation of the sealing structure of the utility model, the sealing structure of the first and second embodiments of the utility model is preferably arranged in the installation groove. When the sealing structure is arranged in the installation groove, the cross section of the sealing member is in contact with the cross section of the installation groove, that is, the second contact surface, the top surface of the sealing member is in contact with the first contact surface, the first sealing member is arranged with the side edge of the installation groove, and the last sealing member is arranged with the side edge of the installation groove. At the same time, the sealing member is slightly higher than the height of the installation groove in the depth direction of the installation groove, such as one tenth to one fifth higher than the height of the installation groove, at this time the sealing member will be compressed in the installation groove, thereby improving the sealing performance.

[0058] Similarly, the multiple sealing members used in the utility model will displace during work, which will affect the sealing effect of the sealing structure. Therefore, in order to solve the above problems, further, the sealing structure in the first and second embodiments of the utility model can be provided with a limiting member to further fix the sealing member and prevent the sealing member from displacing during the work of the scroll compressor. The limiting member can not only be used to separate the sealing members to form a sealed cavity, but also can be used to fix the sealing member.

[0059] When the sealing member is placed between the two contact surfaces, the two surfaces extrude the sealing member, the sealing member is deformed, and the sealing member fills the gap of the installation groove. The two sides and the cross section of the sealing member close to the installation groove are tightly attached to the second contact surface, i.e., the cross section of the installation groove, and the top surface of the sealing member is tightly attached to the first contact surface. Generally, external gas cannot leak inward or outward through the contact part of the sealing member and the first and second contact surfaces, and the sealing member is difficult to displace, which is tightly attached. At this time, the friction between the sealing member and the installation groove and the limiting member increases, which can effectively reduce the displacement of the sealing member and fix the sealing member. At the same time, since the sealing member is tightly attached to the installation groove and the limiting member without gaps, external gas cannot enter the inside, and good sealing and dustproof effect can be achieved.

[0060] As shown in FIG. 1, the sealing structure of the first embodiment of the utility model is taken as an example, and the cross section of the sealing structure is shown in FIG. 2. As shown in FIG. 2, the limiting member is additionally installed between the two sealing members. Figure 8 As shown in FIG. 1, the sealing structure of the first embodiment of the utility model is taken as an example, and the cross section of the sealing structure is shown in FIG. 2. As shown in FIG. 2, the limiting member is additionally installed between the two sealing members.

[0061] As shown in FIG. 1, the sealing structure of the first embodiment of the utility model is taken as an example, and the cross section of the sealing structure is shown in FIG. 2. As shown in FIG. 2, the limiting member is additionally installed between the two sealing members. Figure 9 As shown in FIG. 1, the sealing structure of the first embodiment of the utility model is taken as an example, and the cross section of the sealing structure is shown in FIG. 2. As shown in FIG. 2, the limiting member is additionally installed between the two sealing members.

[0062] In the sealing structure of the prior art scroll compressor, the sealing structure is located outside the static scroll disc or the dynamic scroll disc. The outside is the outer periphery of the meshing area of the rotating scroll on the dynamic scroll disc and the fixed scroll on the static scroll disc of the scroll compressor. A single sealing strip is mostly arranged in the sealing groove to achieve the sealing and dustproof effect. However, when the scroll compressor is working, the dynamic scroll disc moves relative to the static scroll disc, and the temperature inside the entire compressor body is above 150 degrees Celsius. High temperature can cause deformation of the sealing strip and the sealing strip. Long-time friction movement can cause displacement and wear of the sealing strip. When a single sealing groove and a single sealing strip are used, once deformation and wear occur, external gas can easily leak into the scroll compressor, and the sealing effect will be reduced. Especially when the scroll compressor is applied to compression of high-purity gas, once leakage occurs, the high-purity gas will be contaminated, and the purity of the final product gas will be reduced.

[0063] Therefore, in the third embodiment of the utility model, in order to improve the dustproof sealing effect of the sealing structure, the prior art is improved. The mounting groove is arranged on the disc of the static scroll, and the mounting groove can be provided with one or more. The mounting groove has a certain width in the first direction, and can be used to install the sealing structure of the first embodiment and the second embodiment of the utility model. For example, as shown in Figure 10, when the first direction is the radial direction of the static scroll, the mounting groove is circular in planar shape, two mounting grooves are arranged outside the static disc, and the inner part of the mounting groove with large circumference is provided with a small-circumference mounting groove, and the shadow part in the figure is the mounting groove.

[0064] As shown in Figure 11, the convex structure is arranged at the position of the cross section of the mounting groove, which is arranged between the sealing structures and can be used to fix the sealing structure. In the above embodiments, the sealing gas cavity can be inflated by arranging the ventilation structure, in which case the sealing gas cavity can maintain a certain gas, and the sealing effect can be better achieved. Further, the sealing gas cavity generates a slight positive pressure outside the scroll compressor through the ventilation structure, and the sealing effect can be further achieved through the air pressure. Those skilled in the art can choose whether to increase the ventilation structure according to the sealing needs.

[0065] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0066] The above are only exemplary embodiments of the disclosure, and cannot limit the scope of the disclosure. That is, any equivalent changes and modifications made according to the teachings of the disclosure are still within the scope of the disclosure. Those skilled in the art will easily think of embodiments of the disclosure after considering the specification and practicing the disclosure herein. The utility model aims to cover any variations, uses or adaptive changes of the disclosure, which follow the general principles of the disclosure and include common knowledge or conventional technical means in the technical field not recorded in the disclosure. The scope and spirit of the disclosure are defined by the claims.

[0067] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the disclosure.

[0068] Those skilled in the art can easily understand that the above description is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A sealing structure, characterized in that, the sealing structure comprises: at least two sealing members arranged in a first direction; the sealing members have a first top surface and a first cross section, the width of the top surface in the first direction and the width of the cross section in the first direction have a difference; the first top surface of the sealing members is used to directly contact the first contact surface to form a seal of the first end surface, and the two sealing members are directly or indirectly abutted and installed to form a first spacing space; the first spacing space is located between the plane where the two first cross sections abut and the first contact surface; the difference of each of the two sealing members is the same or different; a sealing gas cavity is all or part of the first spacing space; the first direction is the relative movement between the first top surface and the first contact surface, which generates an air gap, and the direction of gas flow in the air gap; the relative movement is the relative displacement movement in the direction of the plane where the first contact surface is located.

2. The seal structure as defined in claim 1, wherein the sealing structure forms a seal around the outer periphery of a sealing area on the first contact surface in a continuous manner; or forms a seal around the outer periphery in an intermittent manner. the difference is the same, and the difference is negative, the width of the first top surface in the first direction is less than the width of the cross section in the first direction.

3. A seal structure as claimed in claim 1 or 2, characterised in that, the difference is the same, and the difference is positive, the width of the first top surface in the first direction is greater than the width of the cross section in the first direction.

4. The seal structure as claimed in claim 1 or 2, wherein the difference is not the same, and the difference of one sealing member is negative or 0, and the difference of the other sealing member is positive or 0.

5. The seal structure as claimed in claim 1 or 2, wherein the sealing structure is used to be installed in a mounting groove, the first sealing member of the sealing members is attached to the first surface of the mounting groove, and the last sealing member of the sealing members is attached to the second surface of the mounting groove.

6. The seal structure as claimed in claim 1 or 2, wherein the two side surfaces of the sealing gas cavity are parallel or not parallel.

7. The seal structure as claimed in claim 1 or 2, wherein the sealing structure is U-shaped or V-shaped.

8. The seal structure as defined in claim 7 wherein, the outer circumferential distribution of the scroll line of the stationary scroll or the moving scroll is provided with at least one mounting groove, and the mounting groove is provided with the sealing structure as claimed in any one of claims 1-8.

9. A scroll compressor having a seal structure, the scroll compressor including a fixed scroll and an orbiting scroll, characterized by: ​

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