Sealing element for vacuum pump shell and high-sealing multi-stage vacuum pump shell

Abstract

The invention provides a sealing element for a vacuum pump shell and a high-sealing multi-stage vacuum pump shell, and the sealing element for the vacuum pump shell comprises an axial sealing strip and a longitudinal sealing ring; an L-shaped connecting structure is formed at the joint between the axial sealing strip and the longitudinal sealing ring; according to the L-shaped connecting structure, an L-shaped notch is formed in the end of the axial sealing strip, the length of the two sides of the L-shaped notch corresponds to the length and the width of the section of the longitudinal sealing ring, the L-shaped notch is attached to the ring edge of the longitudinal sealing ring and then connected with the ring edge of the longitudinal sealing ring, and the joint area of the axial sealing strip and the longitudinal sealing ring is maximized. The flexible sealing piece is simple in overall structure and low in manufacturing cost, after the flexible sealing piece is applied to a multi-stage vacuum pump shell, the technical effect of all-directional high sealing of the connecting position can be achieved, and the sealing effect is extremely remarkable.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-stage vacuum pumps, and in particular to a sealing component for a vacuum pump housing and a high-sealing multi-stage vacuum pump housing. Background Art

[0002] In the prior art, when the shell sealing structure is more complicated, an integrated seal and sealant are often used to seal the mechanical structure. The integrated seal has problems such as high manufacturing cost and difficulty in molding the seal. As for the sealant, high processing accuracy is required for sealing a large area, and the amount of sealant used needs to be precisely controlled, which affects product quality control and increases the difficulty of assembly and processing.

[0003] In existing patent applications:

[0004] 1. CN103443400A: A vacuum pump with longitudinal and annular seals, wherein the end of the longitudinal seal abuts against the annular seal, and the end of the longitudinal seal can be expanded, annular, or retracted into the interior of the housing.

[0005] 2. TW201712229: The annular and longitudinal seals of the vacuum pump are sheet-shaped. The joint of the two seals is a straight line. The end of the seal can be flush with the shell, protruding or retracted.

[0006] 3. TWI 750305B: Pump assembly with stator-connected seal, seal height-to-width ratio, groove size, and potential leakage paths at seal joints.

[0007] 4. CN112654767A: A sealing assembly in which the sealing effect can be improved when the annular seal is squeezed and the longitudinal seal is squeezed.

[0008] 5. TW202142781: Pump and a set of seals for sealing the stator assembly of the pump, material requirements for the seals and definition of hardness and stiffness, and determination of the ratio between the dimensions of longitudinal seals and axial seals.

[0009] 6. CN115853774A: A vacuum pump with a special-shaped sealing structure to prevent internal and external leakage, a manufacturing method, special-shaped sealing feature requirements and installation methods, and specified special-shaped sealing molding conditions such as temperature, time, and mold clamping force.

[0010] 7. CN217602925U: Upper and lower integrated chambers and vacuum pumps, defining a composite mounting groove of the first chamber and the second chamber, and a characteristic shape on the mounting groove.

[0011] In the above patent applications, there is no connection structure between the axial and longitudinal seals, and other special settings are made at the joints, which greatly reduces the sealing effect. However, the vacuum pump requires a high sealing effect and must ensure that each connection has good sealing properties. Summary of the invention

[0012] The object of the present invention is to provide a sealing component and a multi-stage vacuum pump housing which can achieve high sealing and low cost.

[0013] To achieve the above object, the present invention provides a seal for a vacuum pump housing, comprising an axial sealing strip and a longitudinal sealing ring;

[0014] The connection between the axial sealing strip and the longitudinal sealing ring realizes an "L"-shaped connection structure; the "L"-shaped connection structure is that an L-shaped notch is opened at the end of the axial sealing strip, and the length of the two sides of the L-shaped notch corresponds to the length and width of the cross section of the longitudinal sealing ring. The L-shaped notch is attached to the edge of the longitudinal sealing ring and then connected to maximize the joint area between the axial sealing strip and the longitudinal sealing ring; after being applied to the housing of a multi-stage vacuum pump, a high seal is achieved in each corner of a circle, effectively preventing air leakage in the housing.

[0015] Preferably, there are two axial sealing strips and two longitudinal sealing rings; the two longitudinal sealing rings are arranged opposite to each other, and the two axial sealing strips are arranged parallel and opposite to each other; the two ends of the two axial sealing strips are respectively connected to the longitudinal sealing rings on both sides to form a complete shell sealing assembly; the sealing assembly of this structure is more compatible with the existing shell and has a significant sealing effect.

[0016] Preferably, the hardness and elastic coefficient of the axial sealing strip and the longitudinal sealing ring are the same, and ensure that the hardness and elastic coefficient of the seal are within the defined range during actual application, thereby ensuring the same stress and deformation when squeezed against each other.

[0017] The present invention also provides a high-seal multi-stage vacuum pump housing, comprising a multi-stage upper housing, a multi-stage lower housing and end plates on both sides;

[0018] A first sealing groove cooperating with the axial sealing strip is preset on the connecting edge of the multi-stage upper shell and the multi-stage lower shell; a second sealing groove cooperating with the longitudinal sealing ring is provided on the end plate;

[0019] After the multi-stage upper shell cover is arranged on the multi-stage lower shell, the axial sealing strip is pressed into the first sealing groove; when the end plate covers are arranged on both sides of the shell, the longitudinal sealing ring is pressed into the second sealing groove.

[0020] Preferably, the first sealing groove and the axial sealing strip, as well as the second sealing groove and the longitudinal sealing ring, achieve interference fit. When the housing is installed and extruded, the sealing strip can fill the sealing groove to achieve a high sealing effect.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] 1. The flexible seal of the present invention has a simple overall structure and low cost, is suitable for industrial mass production, and reduces manufacturing costs.

[0023] 2. An "L"-shaped connection structure is used between the axial sealing strip and the longitudinal sealing ring to maximize the connection of the seal at the node, expand and fill the groove between the shells, and there is no leakage point in the shell seal, achieving a high sealing effect of the vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the overall structure of a sealing member for a vacuum pump housing in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of an "L"-shaped connection structure of a sealing member for a vacuum pump housing in an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the overall structure of the high-seal multi-stage vacuum pump housing in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described below.

[0028] Example:

[0029] like Figure 1 As shown, in view of the problems of poor sealing effect and high sealing cost of the traditional vacuum pump housing, the present application proposes a flexible sealing member, including an axial sealing strip 1 and a longitudinal sealing ring 2;

[0030] like Figure 2 As shown in the figure, the connection between the axial sealing strip 1 and the longitudinal sealing ring realizes an "L"-shaped connection structure; the "L"-shaped connection structure is that an L-shaped notch is opened at the end of the axial sealing strip 1, and the length of the two sides of the L-shaped notch corresponds to the length and width of the cross section of the longitudinal sealing ring 2. The L-shaped notch is attached to the edge of the longitudinal sealing ring 2 and then connected to maximize the joint area between the axial sealing strip 1 and the longitudinal sealing ring 2; after being applied to the housing of a multi-stage vacuum pump, a high seal is achieved in each corner of a circle, effectively preventing air leakage in the housing.

[0031] In this embodiment, in order to ensure the sealing compatibility with the traditional multi-stage vacuum pump, the number of axial sealing strips 1 is two, and the number of longitudinal sealing rings 2 is two; the two longitudinal sealing rings 2 are arranged opposite to each other, and the two axial sealing strips 1 are parallel and opposite to each other; the two ends of the two axial sealing strips 1 are respectively connected to the longitudinal sealing rings 2 on both sides to form a complete shell sealing assembly; the sealing assembly of this structure is more compatible with the existing shell and has a significant sealing effect.

[0032] In this embodiment, the hardness and elastic coefficient of the axial sealing strip 1 and the longitudinal sealing ring 2 are the same, and the hardness and elastic coefficient of the seal are ensured to be within the defined range in actual application, thereby ensuring the same stress and deformation when squeezed against each other.

[0033] like Figure 3 As shown, the present invention also proposes a highly sealed multi-stage vacuum pump housing, which is composed of a multi-stage upper housing 3, a multi-stage lower housing 4, end plates 5 on both sides and a flexible seal.

[0034] A first sealing groove cooperating with the axial sealing strip 1 is preset on the connecting edge of the multi-stage upper shell 3 and the multi-stage lower shell 4; a second sealing groove cooperating with the longitudinal sealing ring 2 is arranged on the multi-stage upper shell 3 and the multi-stage lower shell 4; after the multi-stage upper shell 3 is covered on the multi-stage lower shell 4, the axial sealing strip 1 is pressed into the first sealing groove; after the end plate 5 is covered on both sides of the shell, the longitudinal sealing ring 2 is pressed into the second sealing groove. The first sealing groove and the axial sealing strip 1, as well as the second sealing groove and the longitudinal sealing ring 2, are both interference fit. When the shell is installed and extruded, the sealing strip can fill the sealing groove to achieve a high sealing effect.

[0035] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. A seal for a vacuum pump housing, characterized in that: It includes an axial sealing strip and a longitudinal sealing ring; The connection between the axial sealing strip and the longitudinal sealing ring realizes an "L"-shaped connection structure; The "L"-shaped connection structure is an L-shaped notch at the end of the axial sealing strip, and the lengths of the two sides of the L-shaped notch correspond to the length and width of the cross-section of the longitudinal sealing ring. The L-shaped notch is fitted to the edge of the longitudinal sealing ring and then connected to maximize the joining area between the axial sealing strip and the longitudinal sealing ring.

2. The seal for a vacuum pump housing according to claim 1, characterized in that: The number of the axial sealing strips is two, and the number of the longitudinal sealing rings is two; The two longitudinal sealing rings are arranged opposite to each other, and the two axial sealing strips are arranged parallel to each other and opposite to each other; the two ends of the two axial sealing strips are respectively connected to the longitudinal sealing rings on both sides to form a complete housing sealing assembly.

3. The seal for a vacuum pump housing according to claim 1, characterized in that: The axial sealing strip and the longitudinal sealing ring have the same hardness and elastic coefficient.

4. A high-seal multi-stage vacuum pump housing, using the vacuum pump housing seal according to any one of claims 1 to 3, characterized in that: It includes a multi-stage upper shell, a multi-stage lower shell and end plates on both sides; A first sealing groove cooperating with the axial sealing strip is preset on the connecting edge of the multi-stage upper shell and the multi-stage lower shell; The side surfaces of the multi-stage upper shell and the multi-stage lower shell are provided with a second sealing groove which cooperates with the longitudinal sealing ring; After the multi-stage upper shell cover is arranged on the multi-stage lower shell, the axial sealing strip is pressed into the first sealing groove; when the end plate cover is arranged on both sides of the shell, the longitudinal sealing ring is pressed into the second sealing groove. 5 . According to the high-seal multi-stage vacuum pump housing of claim 4 , the first sealing groove and the axial sealing strip, as well as the second sealing groove and the longitudinal sealing ring, all achieve interference fit.

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