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

Abstract

The utility model 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 utility model relates to multistage vacuum pump technical field especially, it relates to a kind of sealing element for vacuum pump shell and high sealing multistage vacuum pump shell. BACKGROUND

[0002] In prior art, when the shell sealing structure is relatively complex, the integrated sealing element and the sealing glue are often used to seal the mechanical structure;For integrated sealing element, it has the problems of high cost and difficulty in forming and manufacturing of sealing element;For sealing glue part, high processing precision is required for large-area sealing, and precise amount of glue needs to be controlled, which affects product quality control and increases the difficulty of assembly and processing.

[0003] In existing patent applications:

[0004] 1. CN103443400A: Vacuum pump with longitudinal and annular seal, the end of the longitudinal seal abuts against the annular seal, and the end of the longitudinal seal can be enlarged, annular, or retracted into the housing.

[0005] 2. TW201712229: The vacuum pump annular and longitudinal seal is sheet-shaped, the joint of the two seals is a straight line, and the end of the seal can be flat, convex or retracted into the housing.

[0006] 3. TWI 750305B: Pump assembly with stator connecting seal, the height-width ratio of the seal, the size of the groove, and the potential leakage path at the joint of the seal are mentioned.

[0007] 4. CN112654767A: Sealing assembly, the annular seal is extruded and the longitudinal seal is extruded to improve the sealing effect.

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

[0009] 6. CN115853774A: A vacuum pump with anti-interior and exterior leakage special-shaped sealing structure and its manufacturing method, the special-shaped sealing element features and installation method are required, and the special-shaped sealing element forming conditions of temperature, time and clamping force are defined.

[0010] 7. CN217602925U: Up-down integrated cavity and vacuum pump, the combined installation groove of the first cavity and the second cavity is defined, and the feature shape on the installation groove is defined.

[0011] In the above patent application, there is no connection structure between the axial and longitudinal seals, and other special settings are made at the joint, which greatly reduces the sealing effect, and the vacuum pump requires high sealing effect to ensure good sealing at each connection. Practical new type content

[0012] The utility model discloses a kind of high sealing, low cost sealing element and multistage vacuum pump shell for achieving.

[0013] To achieve the above object, the utility model provides a kind of sealing element for vacuum pump shell, including axial sealing strip and longitudinal sealing ring;

[0014] The connection between axial sealing strip and longitudinal sealing ring realizes "L" shape connection structure;The end of axial sealing strip is provided with L-shaped notch, and the length of the two sides of L-shaped notch corresponds to the length and width of the cross section of longitudinal sealing ring, and the L-shaped notch is connected after being attached to the ring edge of longitudinal sealing ring, to maximize the joint area of axial sealing strip and longitudinal sealing ring;After being applied to multistage vacuum pump shell, high sealing of each corner in a circle is realized, which effectively prevents air leakage in the shell.

[0015] Preferably, the number of axial sealing strips is two, and the number of longitudinal sealing rings is two;Two longitudinal sealing rings are oppositely arranged, and two axial sealing strips are parallel and oppositely arranged;The two ends of the two axial sealing strips are connected with the longitudinal sealing rings on both sides to form a complete shell sealing assembly;The sealing assembly of this structure is more suitable for the existing shell, and the sealing effect is remarkable.

[0016] Preferably, the hardness and elastic coefficient of axial sealing strip and longitudinal sealing ring are the same, and the hardness and elastic coefficient of the sealing element in actual application are ensured within the defined range, so as to ensure the same stress and deformation amount during mutual extrusion.

[0017] The utility model also provides a kind of high sealing multistage vacuum pump shell, including multistage upper shell, multistage lower shell and the end plate on both sides;

[0018] The connecting edge of multistage upper shell and multistage lower shell is provided with a first sealing groove matched with axial sealing strip;The end plate is provided with a second sealing groove matched with longitudinal sealing ring;

[0019] After multistage upper shell cover is arranged on multistage lower shell, axial sealing strip is pressed into first sealing groove;When end plate cover is arranged on both sides of shell, longitudinal sealing ring is pressed into second sealing groove.

[0020] Preferably, the first sealing groove and axial sealing strip, and the second sealing groove and longitudinal sealing ring all realize interference fit, and when the shell is installed and extruded, the sealing strip can fill the sealing groove, to realize high sealing effect.

[0021] Compared with the prior art, the advantages of the utility model lie in that:

[0022] 1、 The flexible sealing piece whole structure simple, the cost is cheap, is suitable for industrialization mass production, reduces the manufacturing cost.

[0023] 2、 The "L" shape connecting structure is used between the axial sealing strip and the longitudinal sealing ring, the maximization of the node sealing piece connection is realized, the groove between the shell is expanded and filled, the shell sealing has no omissions, and the high sealing effect of the vacuum pump is realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the whole structure schematic view of the sealing piece for the vacuum pump shell in the utility model embodiment;

[0025] Figure 2 It is the "L" shape connecting structure schematic view of the sealing piece for the vacuum pump shell in the utility model embodiment;

[0026] Figure 3 It is the whole structure schematic view of the high sealing multistage vacuum pump shell in the utility model embodiment. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantage of the utility model more clear, the technical scheme of the utility model will be further explained below.

[0028] Embodiment:

[0029] As shown in the figure, in view of the problems of poor sealing effect and high sealing cost of the traditional vacuum pump shell, the application proposes a flexible sealing piece, which comprises an axial sealing strip 1 and a longitudinal sealing ring 2. Figure 1 As shown in the figure, the connecting part between the axial sealing strip 1 and the longitudinal sealing ring realizes the "L" shape connecting structure; the "L" shape connecting structure is provided with an L-shaped notch at the end of the axial sealing strip 1, the two side lengths of the L-shaped notch correspond to the length and width of the cross section of the longitudinal sealing ring 2, the L-shaped notch is connected after being attached to the ring edge of the longitudinal sealing ring 2, the joint area of the axial sealing strip 1 and the longitudinal sealing ring 2 is maximized; after being applied to the multistage vacuum pump shell, the high sealing of each corner of a ring is realized, and the air leakage in the shell is effectively prevented.

[0030] Figure 2

[0031] ​​In the embodiment, in order to ensure the sealing fit between the conventional 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 oppositely arranged, and the two axial sealing strips 1 are oppositely arranged in parallel; the two ends of the two axial sealing strips 1 are connected with the two longitudinal sealing rings 2 on the two sides to form a complete shell sealing assembly; the sealing assembly of the structure is more suitable for the existing shell, and the sealing effect is remarkable.

[0032] In the embodiment, the hardness and the elastic coefficient of the axial sealing strip 1 and the longitudinal sealing ring 2 are the same, and it is ensured that the hardness and the elastic coefficient of the sealing member in actual application are within the defined range, so that the stress and the deformation amount of mutual extrusion are the same.

[0033] As shown in Figure 3 The utility model discloses still propose a kind of high sealing multi-stage vacuum pump shell, by multi-stage upper shell 3, multi-stage lower shell 4, two sides end plate 5 and flexible sealing element.

[0034] First sealing groove matched with axial sealing strip 1 is preset on the connecting edge of multi-stage upper shell 3 and multi-stage lower shell 4;Second sealing groove matched with longitudinal sealing ring 2 is provided on multi-stage upper shell 3 and multi-stage lower shell 4;After multi-stage upper shell 3 is covered on multi-stage lower shell 4, axial sealing strip 1 is pressed into first sealing groove;When end plate 5 is covered on the two sides of shell, longitudinal sealing ring 2 is pressed into second sealing groove.First sealing groove and axial sealing strip 1, and second sealing groove and longitudinal sealing ring 2 all realize interference fit, when shell is installed extrusion, sealing strip can be filled with sealing groove, realize the effect of high sealing.

[0035] The above is only preferred embodiment of the utility model, and does not have any limit to the utility model. Any person skilled in the art, without departing from the technical scheme of the utility model, to the technical scheme and technical content disclosed by the utility model, any form of equivalent replacement or modification, etc. change, all belong to the content of the technical scheme of the utility model, still belong to the protection scope of the utility model.

Claims

1. A sealing element for a vacuum pump housing, characterized in that, Includes axial sealing strips and longitudinal sealing rings; The connection between the axial sealing strip and the longitudinal sealing ring is an "L" shaped connection structure. The "L"-shaped connection structure has an L-shaped groove at the end of the axial sealing strip. The lengths of the two sides of the L-shaped groove correspond to the length and width of the longitudinal sealing ring cross-section. The L-shaped groove is fitted 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.

2. The sealing element for a vacuum pump housing according to claim 1, characterized in that, The number of axial sealing strips is two, and the number of longitudinal sealing rings is two; The two longitudinal sealing rings are arranged opposite each other, and the two axial sealing strips are arranged parallel and opposite 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 sealing element 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-sealing multi-stage vacuum pump housing, using the vacuum pump housing seal as described in any one of claims 1-3, characterized in that, It includes a multi-stage upper shell, a multi-stage lower shell, and end plates on both sides; The connecting edge between the multi-stage upper housing and the multi-stage lower housing is pre-set with a first sealing groove that mates with the axial sealing strip; The sides of the multi-stage upper housing and the multi-stage lower housing are provided with a second sealing groove that mates with the longitudinal sealing ring; After the multi-stage upper housing is installed on the multi-stage lower housing, the axial sealing strip is pressed into the first sealing groove; when the end plate is installed on both sides of the housing, the longitudinal sealing ring is pressed into the second sealing groove.

5. The high-sealing multi-stage vacuum pump housing according to claim 4, characterized in that, The first sealing groove and the axial sealing strip, as well as the second sealing groove and the longitudinal sealing ring, are all interference fit.

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