Vacuum pump shaft seal structure

Abstract

The utility model discloses a shaft seal structure of a vacuum pump. The shaft seal structure comprises a pump shaft, the shell is arranged on the pump shaft in a sleeving manner; the fixing plate is arranged on the outer surface of the pump shaft; the first annular piece is arranged on the outer side of the pump shaft in a sleeving manner; one end of the annular sealing piece is connected with the first annular piece, and the other end of the annular sealing piece makes contact with one end face of the fixing plate; the first annular groove is formed in the outer surface of the first annular piece; the first sealing ring is arranged in the first annular groove; the sealing cover is connected with one end of the shell; one end of the elastic part is connected with the first annular part, the other end of the elastic part is connected with the sealing cover, and under the action of the elastic part, the first annular part and the annular sealing part can be driven to move, so that one end of the annular sealing part is in contact with one end face of the fixing plate; and a gap between the shell and the first annular piece can be sealed, so that the phenomenon of air leakage or liquid leakage is prevented, and convenience is brought to people.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pump shaft seals, in particular to a vacuum pump shaft seal structure. Background Art

[0002] At present, a vacuum pump refers to a device or equipment that uses mechanical, physical, chemical or physicochemical methods to evacuate the container to obtain a vacuum. In the production and use of vacuum pumps, the shaft seal is very critical.

[0003] However, many traditional vacuum pumps have a single-layer shaft seal structure. During the long-term use of the vacuum pump, due to the relatively simple shaft seal structure, leakage or air leakage is prone to occur, resulting in poor shaft seal effect of the traditional vacuum pump. Utility Model Content

[0004] In order to solve the above problems, that is, to solve the problems raised by the above background technology, the utility model proposes a vacuum pump shaft seal structure, comprising:

[0005] Pump shaft, pre-installed on the vacuum pump;

[0006] A housing, sleeved on the pump shaft and connected to the vacuum pump;

[0007] a fixing plate, disposed on the outer surface of the pump shaft;

[0008] a first annular member, sleeved on the outer side of the pump shaft;

[0009] an annular sealing member, one end of which is connected to the first annular member and the other end of which is in contact with an end surface of the fixing plate;

[0010] a first annular groove formed on an outer surface of the first annular member;

[0011] a first sealing ring, disposed in the first annular groove, with an outer wall surface in contact with an inner wall surface of the housing;

[0012] A sealing cover is sleeved on the outer side of the pump shaft and connected to one end of the housing;

[0013] An elastic member has one end connected to the first annular member and the other end connected to the sealing cover.

[0014] Preferably, a second annular member is provided on the inner wall surface of the housing and between the fixing plate and the first annular member;

[0015] A second annular groove is formed on the inner wall surface of the second annular member. A second sealing ring is disposed in the second annular groove. The inner wall surface of the second sealing ring contacts the outer wall surface of the annular sealing member.

[0016] Preferably, a limiting tube is fixedly mounted on the inner wall surface of the sealing cover, and a limiting rod plugged into the limiting tube is fixedly mounted on one end surface of the first annular member.

[0017] Preferably, the elastic member is a compression spring.

[0018] The beneficial technical effects of the utility model are as follows: under the action of the elastic member, the first annular member and the annular seal can be driven to move, so that one end of the annular seal contacts one end surface of the fixed plate. At the same time, under the action of the first sealing ring, the gap between the housing and the first annular member can be sealed to prevent air or liquid leakage.

[0019] At the same time, under the action of the second annular member, the second annular groove and the second sealing ring, the gap between the housing and the annular sealing member can be sealed again, which can improve the sealing effect and bring convenience to people. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the main cross-sectional structure of the present invention is shown.

[0021] Figure 2 The utility model is shown Figure 1 Schematic diagram of the enlarged structure of part A.

[0022] Figure 3 The utility model is shown Figure 1 Schematic diagram of the enlarged structure of part B.

[0023] Figure 1: Pump shaft, 2: Housing, 3: Fixed plate, 4: First annular member, 5: Annular sealing member, 6: First annular groove, 7: First sealing ring, 8: Sealing cover, 9: Elastic member, 10: Second annular member, 11: Second annular groove, 12: Second sealing ring, 13: Limiting tube, 14: Limiting rod. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0025] The utility model proposes a vacuum pump shaft seal structure, comprising:

[0026] Pump shaft 1, preset on the vacuum pump;

[0027] The housing 2 is sleeved on the pump shaft 1 and connected to the vacuum pump;

[0028] One end of the housing 2 is fixedly connected to the vacuum pump and can be relatively fixed;

[0029] The fixing plate 3 is arranged on the outer surface of the pump shaft 1;

[0030] The fixed plate 3 is fixedly mounted on the outer surface of the pump shaft 1 and can be fixed relative to it so that when the pump shaft 1 rotates, the fixed plate 3 can be driven to rotate at the same time;

[0031] The first annular member 4 is sleeved on the outer side of the pump shaft 1;

[0032] an annular sealing member 5, one end of which is connected to the first annular member 4, and the other end of which is in contact with one end surface of the fixed plate 3;

[0033] The annular seal 5 is a rubber annular seal, one end of which is fixedly connected to one end surface of the first annular member 4, and the other end of which is in contact with one end surface of the fixed plate 3;

[0034] a first annular groove 6 formed on the outer surface of the first annular member 4;

[0035] The first sealing ring 7 is provided in the first annular groove 6, and the outer wall surface contacts the inner wall surface of the housing 2;

[0036] The first sealing ring 7 is a rubber sealing ring that can seal the gap between the housing 2 and the first annular member 4;

[0037] The sealing cover 8 is sleeved on the outer side of the pump shaft 1 and connected to one end of the housing 2;

[0038] The sealing cover 8 is fixedly connected to one end of the housing 2 by bolts, and can seal the housing 2;

[0039] an elastic member 9, one end of which is connected to the first annular member 4, and the other end of which is connected to the sealing cover 8;

[0040] One end of the elastic member 9 is fixedly connected to one end surface of the first annular member 4, and the other end is fixedly connected to one end surface of the sealing cover 8. A force can be applied to the first annular member 4, so that the first annular member 4 drives the annular seal 5 to move, so that one end of the annular seal 5 is always in contact with one end surface of the fixed plate 3.

[0041] Specifically, a second annular member 10 is provided on the inner wall surface of the housing 2 and between the fixing plate 3 and the first annular member 4;

[0042] The outer wall surface of the second annular member 10 is fixedly connected to the inner wall surface of the housing 2 and can be relatively fixed;

[0043] A second annular groove 11 is formed on the inner wall surface of the second annular member 10, and a second sealing ring 12 is provided in the second annular groove 11. The inner wall surface of the second sealing ring 12 contacts the outer wall surface of the annular sealing member 5;

[0044] The second sealing ring 12 is a rubber sealing ring, which can seal the gap between the second annular member 10 and the annular sealing member 5 .

[0045] Specifically, a limiting tube 13 is fixedly mounted on the inner wall surface of the sealing cover 8, and a limiting rod 14 that is plugged into the limiting tube 13 is fixedly mounted on one end surface of the first annular member 4;

[0046] Under the action of the limiting rod 14 and the limiting tube 13 , the first annular member 4 can be limited so that the position of the first annular member 4 in the housing 2 remains stable.

[0047] Specifically, the elastic member 9 is a compression spring.

[0048] Working principle: In actual use, the elastic part 9 can apply a force to the first annular part 4, so that the first annular part 4 drives the annular seal 5 to move in the direction of the fixed plate 3, and makes one end of the annular seal 5 always contact with one end face of the fixed plate 3 for sealing. At the same time, the outer wall surface of the second sealing ring 12 contacts the outer surface of the annular seal 5, so as to seal the gap between the second annular part 10 and the annular seal 5. The first sealing ring 7 can seal the gap between the housing 2 and the first annular part 4. At the same time, when the pump shaft 1 is used for a long time, one end face of the fixed plate 3 rubs against one end of the annular seal 5, causing wear of the annular seal 5. At this time, the staff turns the bolt to remove the sealing cover 8 and open the housing 2. At this time, pull the sealing cover 8 to take out the elastic part 9, the first annular part 4 and the annular seal 5, so that the damaged annular seal 5 can be easily replaced, which brings convenience to people.

[0049] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

[0050] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and are not intended to indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0052] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, article, or apparatus / device.

[0053] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A vacuum pump shaft seal structure, characterized in that: include; A pump shaft (1) is pre-installed on the vacuum pump; A housing (2) is sleeved on the pump shaft (1) and connected to the vacuum pump; A fixing plate (3) is provided on the outer surface of the pump shaft (1); A first annular member (4) is sleeved on the outer side of the pump shaft (1); an annular sealing member (5), one end of which is connected to the first annular member (4) and the other end of which is in contact with an end surface of the fixing plate (3); a first annular groove (6) formed on the outer surface of the first annular member (4); A first sealing ring (7) is disposed in the first annular groove (6), and an outer wall surface of the first sealing ring contacts an inner wall surface of the housing (2); A sealing cover (8) is sleeved on the outside of the pump shaft (1) and connected to one end of the housing (2); An elastic member (9) has one end connected to the first annular member (4) and the other end connected to the sealing cover (8).

2. A vacuum pump shaft seal structure according to claim 1, characterized in that: A second annular member (10) is provided on the inner wall surface of the housing (2) and between the fixing plate (3) and the first annular member (4); A second annular groove (11) is formed on the inner wall surface of the second annular member (10), a second sealing ring (12) is provided in the second annular groove (11), and the inner wall surface of the second sealing ring (12) contacts the outer wall surface of the annular sealing member (5).

3. A vacuum pump shaft seal structure according to claim 1, characterized in that: A limiting tube (13) is fixedly mounted on the inner wall surface of the sealing cover (8), and a limiting rod (14) plugged into the limiting tube (13) is fixedly mounted on one end surface of the first annular member (4).

4. A vacuum pump shaft seal structure according to claim 1, characterized in that: The elastic member (9) is a compression spring.

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