A vacuum pollution-proof magnetic fluid sealing device

Abstract

The utility model relates to the technical field of magnetic fluid sealing, and specifically discloses a vacuum pollution-proof magnetic fluid sealing device, comprising a shell, a rotating shaft is installed at the center position inside the shell, a sealing structure is installed inside the shell, the sealing structure comprises a ring sleeve installed inside the shell, the inner wall of the ring sleeve is fixedly connected with a boss, the outer wall of the rotating shaft is installed with a sealing sleeve, the outer wall of the sealing sleeve is fixedly connected with a sealing groove matching the boss, a sealing magnetic ring is installed between the inner wall of the sealing groove and the boss, and by installing the sealing structure, polluted gas and dust can be blocked from entering under vacuum state, and specifically, the ring sleeve and the sealing sleeve are installed in coordination with each other to form a magnetic field gradient between the boss and the sealing groove, so that the boss and the sealing groove can achieve magnetic fluid sealing, thereby effectively blocking harmful gas and dust under vacuum state and avoiding pollution, and the boss and the sealing groove are sealed by the sealing magnetic ring, so as to further improve the sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic fluid sealing, in particular to a vacuum pollution-proof magnetic fluid sealing device. Background Art

[0002] The application of magnetic fluid sealing technology in sealing technology is one of its most important achievements. After decades of development, magnetic fluid sealing has been widely used in many fields such as national defense, aerospace, machinery, electronics, instrumentation, atomic energy, chemical industry, and pharmaceuticals, especially in dustproof sealing, vacuum sealing, and differential pressure sealing. For example, the sealing of important mechanical rotating parts, especially in the rotating shaft as the dynamic leakage-proof part of the equipment, has outstanding advantages. It can achieve the purpose of leakage prevention without affecting the movement of movable parts. Therefore, the application scope of magnetic fluid sealing technology is getting wider and wider.

[0003] A magnetic fluid sealing device generally consists of a permanent magnet, two magnetic poles, a rotating shaft and a magnetic fluid to form a sealing assembly, which is then installed in a housing. During installation, a magnetic sleeve is used to isolate the magnetic field to prevent the bearing from being magnetized. The bearing is used to ensure the rotation of the rotating shaft. The bearing cover performs axial positioning on the above parts to prevent the above parts from moving.

[0004] At present, during the use of magnetic fluid sealing devices, due to inadequate sealing, external harmful gases and dust can easily enter the shell, causing contamination of the magnetic fluid and affecting the sealing effect. Therefore, it is necessary to propose a vacuum pollution-proof magnetic fluid sealing device to solve the above-mentioned problems. Utility Model Content

[0005] The utility model aims to provide a vacuum pollution-proof magnetic fluid sealing device, which has the effect of effectively blocking harmful gases and dust and avoiding pollution in a vacuum state, and the sealing effect can be further improved by a sealing magnetic ring.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a vacuum pollution-proof magnetic fluid sealing device, comprising a shell, a rotating shaft is installed at the center position inside the shell, two magnetic poles are installed inside the shell, a permanent magnet located between the two magnetic poles is installed inside the shell, two groups of bearings are installed between the outer wall of the rotating shaft and the inner wall of the shell, a sealing structure is installed inside the shell, the sealing structure comprises a ring sleeve installed inside the shell, the inner wall of the ring sleeve is fixedly connected with a boss, a sealing sleeve is installed on the outer wall of the rotating shaft, the outer wall of the sealing sleeve is fixedly connected with a sealing groove matching the boss, and a sealing magnetic ring is installed between the inner wall of the sealing groove and the boss;

[0007] A plurality of first sealing rings are installed on the outer wall of the sealing sleeve.

[0008] In order to prevent harmful gases and dust from entering the housing, as a preferred vacuum pollution-proof magnetic fluid sealing device of the utility model, a sealing gasket is installed on the left side of the ring sleeve and the sealing sleeve, and a pressure ring sleeved on the outer wall of the rotating shaft is installed on the left side of the sealing gasket.

[0009] In order to improve the sealing effect, as a preferred vacuum pollution-proof magnetic fluid sealing device of the utility model, the inner wall of the ring sleeve is provided with a plurality of grooves, and a second sealing ring located outside the first sealing ring is installed inside each of the plurality of grooves.

[0010] In order to ensure that a sealing assembly is formed between the magnetic poles and the permanent magnets and the rotating shaft, as a preferred vacuum pollution-proof magnetic fluid sealing device of the utility model, the space between the magnetic poles and the rotating shaft is filled with magnetic fluid.

[0011] In order to ensure that the gas does not leak, as a preferred embodiment of the vacuum pollution-proof magnetic fluid sealing device of the present invention, a sealing ring is installed on the left side of the shell.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] The utility model firstly installs a sealing structure on the left side of the left bearing, which can block the entry of harmful gases and dust under a vacuum state. Specifically, the ring sleeve and the sealing sleeve are installed in cooperation with each other, so that the boss is located in the sealing groove, and a magnetic field gradient is formed between the boss and the sealing groove, so that the boss and the sealing groove can achieve a magnetic fluid seal, thereby effectively blocking harmful gases and dust under a vacuum state and avoiding pollution. The boss and the sealing groove are sealed by a sealing magnetic ring, which can further improve the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall structure diagram of the utility model;

[0015] Figure 2 This is a structural diagram of the ring sleeve and the sealing sleeve of the utility model;

[0016] Figure 3 This is a structural diagram of the sealing sleeve of the utility model.

[0017] In the figure: 1, housing; 101, rotating shaft; 102, bearing; 2, magnetic pole; 201, permanent magnet; 3, ring sleeve; 301, boss; 4, sealing sleeve; 401, sealing groove; 5, sealing magnetic ring; 501, first sealing ring; 502, groove; 503, second sealing ring; 6, sealing gasket; 7, pressure ring. DETAILED DESCRIPTION

[0018] See also Figures 1 to 3, a vacuum pollution-proof magnetic fluid sealing device, comprising a shell 1, a rotating shaft 101 is installed at the center position inside the shell 1, two magnetic poles 2 are installed inside the shell 1, a permanent magnet 201 located between the two magnetic poles 2 is installed inside the shell 1, two groups of bearings 102 are installed between the outer wall of the rotating shaft 101 and the inner wall of the shell 1, a sealing structure is installed inside the shell 1, the sealing structure comprises a ring sleeve 3 installed inside the shell 1, a boss 301 is fixedly connected to the inner wall of the ring sleeve 3, a sealing sleeve 4 is installed on the outer wall of the rotating shaft 101, a sealing groove 401 matching the boss 301 is fixedly connected to the outer wall of the sealing sleeve 4, and a sealing magnetic ring 5 is installed between the inner wall of the sealing groove 401 and the boss 301;

[0019] A plurality of first sealing rings 501 are installed on the outer wall of the sealing sleeve 4 .

[0020] In this embodiment: by installing a sealing structure on the left side of the left bearing 102, harmful gases and dust can be blocked from entering under a vacuum state. Specifically, the ring sleeve 3 and the sealing sleeve 4 are installed in cooperation with each other so that the boss 301 is located in the sealing groove 401, and a magnetic field gradient is formed between the boss 301 and the sealing groove 401, so that the boss 301 and the sealing groove 401 can achieve a magnetic fluid seal, thereby effectively blocking harmful gases and dust and avoiding pollution under a vacuum state, and the boss 301 and the sealing groove 401 are sealed by the sealing magnetic ring 5, which can further improve the sealing effect.

[0021] As a technical optimization solution of the utility model, a sealing gasket 6 is installed on the left side of the ring sleeve 3 and the sealing sleeve 4, and a pressure ring 7 sleeved on the outer wall of the rotating shaft 101 is installed on the left side of the sealing gasket 6.

[0022] In this embodiment, the annular sleeve 3 and the sealing sleeve 4 can be sealed by the sealing gasket 6, and the sealing gasket 6 can be squeezed by the pressure ring 7, so that the sealing gasket 6 is tightly attached to the annular sleeve 3 and the sealing sleeve 4, thereby preventing harmful gases and dust from entering and causing pollution to the magnetic fluid.

[0023] As a technical optimization solution of the present invention, the inner wall of the ring sleeve 3 is provided with a plurality of grooves 502 , and a second sealing ring 503 located outside the first sealing ring 501 is installed inside each of the plurality of grooves 502 .

[0024] In this embodiment, the second sealing ring 503 can further improve the sealing effect and block the entry of harmful gases and dust.

[0025] As a technical optimization solution of the present invention, magnetic fluid is filled between the magnetic pole 2 and the rotating shaft 101 .

[0026] In this embodiment, a magnetic fluid is used to ensure that a sealing assembly is formed between the magnetic pole 2 and the permanent magnet 201 and the rotating shaft 101 .

[0027] As a technical optimization solution of the present invention, a sealing ring is installed on the left side of the housing 1.

[0028] In this embodiment: the sealing ring can ensure that the gas does not leak from here.

[0029] Working principle: First, by installing a sealing structure on the left side of the left bearing 102, the entry of polluted gases and dust can be blocked under a vacuum state. Specifically, the ring sleeve 3 and the sealing sleeve 4 are installed in cooperation with each other so that the boss 301 is located in the sealing groove 401, and a magnetic field gradient is formed between the boss 301 and the sealing groove 401, so that the boss 301 and the sealing groove 401 can achieve a magnetic fluid seal, thereby effectively blocking harmful gases and dust under a vacuum state to avoid pollution. The boss 301 and the sealing groove 401 are sealed by the sealing magnetic ring 5, which can further improve the sealing effect. The ring sleeve 3 and the sealing sleeve 4 can be sealed by the sealing gasket 6, and the sealing gasket 6 can be squeezed by the pressure ring 7 to make the sealing gasket 6 close to the ring sleeve 3 and the sealing sleeve 4, thereby preventing harmful gases and dust from entering and affecting the sealing effect of the magnetic fluid.

[0030] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum contamination-proof magnetic fluid sealing device, comprising a housing (1), a rotating shaft (101) installed at a central position inside the housing (1), two magnetic poles (2) installed inside the housing (1), a permanent magnet (201) located between the two magnetic poles (2) installed inside the housing (1), two sets of bearings (102) installed between the outer wall of the rotating shaft (101) and the inner wall of the housing (1), characterized in that: A sealing structure is installed inside the housing (1), the sealing structure comprising a ring sleeve (3) installed inside the housing (1), the inner wall of the ring sleeve (3) being fixedly connected to a boss (301), a sealing sleeve (4) being installed on the outer wall of the rotating shaft (101), a sealing groove (401) matching the boss (301) being fixedly connected to the outer wall of the sealing sleeve (4), and a sealing magnetic ring (5) being installed between the inner wall of the sealing groove (401) and the boss (301); A plurality of first sealing rings (501) are installed on the outer wall of the sealing sleeve (4).

2. The vacuum contamination-proof magnetic fluid sealing device according to claim 1, characterized in that: A sealing gasket (6) is installed on the left side of the ring sleeve (3) and the sealing sleeve (4), and a pressure ring (7) sleeved on the outer wall of the rotating shaft (101) is installed on the left side of the sealing gasket (6).

3. The vacuum contamination-proof magnetic fluid sealing device according to claim 1, characterized in that: The inner wall of the ring sleeve (3) is provided with a plurality of grooves (502), and a second sealing ring (503) located outside the first sealing ring (501) is installed inside each of the plurality of grooves (502).

4. The vacuum contamination-proof magnetic fluid sealing device according to claim 1, characterized in that: A magnetic fluid is filled between the magnetic pole (2) and the rotating shaft (101).

5. The vacuum contamination-proof magnetic fluid sealing device according to claim 1, characterized in that: A sealing ring is installed on the left side of the housing (1).

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