Two-stage magnetofluid sealing device with nitrogen protection

Abstract

The utility model discloses a two-stage magnetofluid sealing device with nitrogen protection, which comprises a bipolar nitrogen protection mechanism, the bipolar nitrogen protection mechanism comprises a shell, the outside of the shell is fixedly connected with a nitrogen inlet through a flange, and a first magnetofluid sealing element and a second magnetofluid sealing element are fixedly mounted in the shell. Through the arrangement of the bipolar nitrogen protection mechanism, the magnetofluid sealing device adopts a two-stage magnetofluid sealing structure, the front end of the first magnetofluid sealing element is close to one side of the cavity, the second magnetofluid sealing element is arranged on the other side of the cavity, and the shell flange is provided with the nitrogen inlet. Compared with the conventional single-stage magnetic fluid sealing, the two-stage sealing has the advantages that under the condition that the first magnetic fluid sealing element loses efficacy, the second magnetic fluid sealing element of the magnetic fluid sealing device with the structure can still play a sealing role with the same effect; and the service life of the magnetofluid seal is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic fluid sealing devices, in particular to a double-stage magnetic fluid sealing device with nitrogen protection. Background Art

[0002] Magnetic fluid sealing devices use magnetic fields to control magnetic fluid to form liquid seals. They have the advantages of efficient sealing, low friction and self-repairing, and are widely used in vacuum systems, rotating machinery, medical equipment, semiconductor manufacturing, aerospace and military fields. Despite the limitations of magnetic field dependence and high cost, their excellent performance gives them irreplaceable advantages in high-demand sealing applications.

[0003] When it is necessary to seal the magnetic fluid, a magnetic fluid sealing device is generally used. At present, most of the magnetic fluid sealing devices adopt single-stage sealing processing, and the previous single-stage magnetic fluid seals are prone to sealing failure and loss under complex working conditions, and do not have other protective sealing measures, and are not practical. Therefore, in order to solve the above problems, a two-stage magnetic fluid sealing device with nitrogen protection is proposed. Utility Model Content

[0004] The utility model mainly solves the technical problems existing in the above-mentioned prior art and provides a double-stage magnetic fluid sealing device with nitrogen protection.

[0005] To achieve the above object, the utility model provides the following technical solution: a two-stage magnetic fluid sealing device with nitrogen protection, comprising a bipolar nitrogen protection mechanism, the bipolar nitrogen protection mechanism comprising a shell, the outside of the shell is fixedly connected with a nitrogen port through a flange, the inside of the shell is fixedly installed with a first magnetic fluid seal and a second magnetic fluid seal, the first magnetic fluid seal and the second magnetic fluid seal are respectively installed at two sides of the inside of the shell, the nitrogen port is arranged at one end of the shell, and the nitrogen port is arranged as a one-way nitrogen port, allowing nitrogen or other gases to enter the system, but not allowing the gas to flow out of the system in the reverse direction.

[0006] Preferably, a clamp is provided inside the shell, and the clamp is threadedly connected to the shell. The clamp is provided at one end of the shell. Two clamps are provided, which are respectively provided at the inner positions of the walls on both sides of the shell. When the clamp is twisted, one end of the clamp can be screwed into the inner position of the shell.

[0007] Preferably, a screw cap is provided inside the shell, and the screw cap is threadably connected to the shell. The screw cap is used to close the external opening of the sealing device to provide protection and maintain the integrity of the internal components.

[0008] Preferably, a bearing is installed inside the shell, and a bearing sleeve is fixedly connected to one side of the bearing. Two bearings are provided, and the bearings are used to support and position the rotating shaft, reduce friction and ensure the smooth operation of the rotating parts.

[0009] Preferably, an O-ring is provided inside the shell, and two O-rings are provided, which are respectively arranged at two ends of the shell. Notches are also provided at both ends of the shell so that a part of the O-ring can be stuck in the notch and fixed.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0011] 1. The utility model adopts a two-stage magnetic fluid sealing structure through the setting of a bipolar nitrogen protection mechanism. The front end of the first magnetic fluid seal is close to one side of the cavity, and the second magnetic fluid seal is arranged on the other side. The shell flange is provided with a nitrogen port. Compared with the previous single-stage magnetic fluid seal, the second magnetic fluid seal of the magnetic fluid sealing device of the structure can continue to play an equivalent sealing role when the first magnetic fluid seal fails, thereby extending the service life of the magnetic fluid seal.

[0012] 2. The utility model is provided with a dustproof oil seal and a nitrogen inlet. Therefore, the device can also be used in working conditions with complex oil and gas pollutants inside the cavity, thereby broadening the scope of use of the magnetic fluid sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model from the side;

[0015] Figure 2 It is a structural schematic diagram of the test section of the utility model.

[0016] In the figure: 1, housing; 2, nitrogen port; 3, first magnetic fluid seal; 4, second magnetic fluid seal; 5, clamp; 6, screw cap; 7, dustproof oil seal; 8, bearing; 9, bearing sleeve; 10, O-ring. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-2 A two-stage magnetic fluid sealing device with nitrogen protection includes a bipolar nitrogen protection mechanism, the bipolar nitrogen protection mechanism includes a shell 1, the outside of the shell 1 is fixedly connected with a nitrogen port 2 through a flange, the inside of the shell 1 is fixedly installed with a first magnetic fluid seal 3 and a second magnetic fluid seal 4, the first magnetic fluid seal 3 and the second magnetic fluid seal 4 are respectively installed at two sides of the inside of the shell 1, the nitrogen port 2 is set at one end of the shell 1, the inside of the shell 1 is provided with a clamp 5, the clamp 5 is threadedly connected to the shell 1, and the clamp 5 is set at one end of the shell 1. The shell 1 has a screw cap 6 at its end, and the screw cap 6 is threadedly connected to the shell 1. The magnetic fluid sealing device adopts a two-stage magnetic fluid sealing structure. The front end of the first magnetic fluid seal 3 is close to one side of the cavity, and the second magnetic fluid seal 4 is arranged on the other side. The flange of the shell 1 is provided with a nitrogen port 2. Compared with the previous single-stage magnetic fluid seal, this double-stage seal can continue to play an equivalent sealing role in the case of failure of the first magnetic fluid seal 3, thereby extending the service life of the magnetic fluid seal.

[0019] In one aspect of the present embodiment, a dustproof oil seal 7 is provided inside the housing 1, and the dustproof oil seal 7 is arranged at one end of the housing 1. A bearing 8 is installed inside the housing 1, and a bearing sleeve 9 is fixedly connected to one side of the bearing 8. Two bearings 8 are provided. An O-ring 10 is provided inside the housing 1, and two O-rings 10 are provided, which are respectively arranged at the two ends of the housing 1. The dustproof oil seal 7 is used to prevent dust and other pollutants from entering the interior of the sealing device while retaining lubricating oil. In the case of a relatively harsh external environment, the dustproof oil seal 7 provides additional protection to ensure the cleanliness and lubrication of the internal components, thereby maintaining the normal operation of the sealing device. The bearing 8 is used to support and Position the rotating shaft, reduce friction and ensure the smooth operation of the rotating parts. In the magnetic fluid sealing device, the bearing 8 ensures the stable operation of the rotating shaft and reduces the wear and heat generation caused by friction. The bearing sleeve 9 is used to protect the shaft from direct wear and extend the service life of the shaft and the entire sealing device. The O-ring 10 is used to provide static and dynamic sealing to prevent fluid or gas leakage. At various connection parts and joints of the device, the O-ring 10 ensures that there are no leakage points and enhances the overall sealing effect. Because a dustproof oil seal 7 and a nitrogen port 2 are provided, the device can also be used in working conditions with complex oil and gas pollutants inside the cavity, which broadens the scope of use of the magnetic fluid sealing device.

[0020] Working principle of the utility model: when the two-stage magnetic fluid sealing device with nitrogen protection is in use, the dustproof oil seal 7 is used to prevent dust and other pollutants from entering the interior of the sealing device, while retaining lubricating oil. In the case of a relatively harsh external environment, the dustproof oil seal 7 provides additional protection to ensure the cleanliness and lubrication of internal components, thereby maintaining the normal operation of the sealing device. The bearing 8 is used to support and position the rotating shaft, reduce friction and ensure the smooth operation of the rotating parts. In the magnetic fluid sealing device, the bearing 8 ensures the stable operation of the rotating shaft, reduces the wear and heat generation caused by friction, and the bearing sleeve 9 is used to protect the shaft from direct wear and extend the service life of the shaft and the entire sealing device. The O-ring 10 is used to provide static and dynamic sealing to prevent fluid or gas leakage. The front end of the first magnetic fluid seal 3 is close to one side of the cavity, and the second magnetic fluid seal 4 is arranged on the other side. The flange of the housing 1 is provided with a nitrogen port 2. Compared with the previous single-stage magnetic fluid seal, this two-stage seal can continue to play an equivalent sealing role in the case of failure of the first magnetic fluid seal 3.

[0021] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A two-stage magnetic fluid sealing device with nitrogen protection, including a bipolar nitrogen protection mechanism, characterized in that: The bipolar nitrogen protection mechanism comprises a shell (1), the outside of the shell (1) is fixedly connected to a nitrogen gas outlet (2) via a flange, the inside of the shell (1) is fixedly installed with a first magnetic fluid seal (3) and a second magnetic fluid seal (4), the first magnetic fluid seal (3) and the second magnetic fluid seal (4) are respectively installed at two sides of the inside of the shell (1), the nitrogen gas outlet (2) is arranged at one end of the shell (1), and the inside of the shell (1) is provided with a dustproof oil seal (7), and the dustproof oil seal (7) is arranged at one end of the inside of the shell (1).

2. A two-stage magnetic fluid sealing device with nitrogen protection according to claim 1, characterized in that: A clamp (5) is arranged inside the shell (1), the clamp (5) is threadedly connected to the shell (1), and the clamp (5) is arranged at one end of the shell (1).

3. A two-stage magnetic fluid sealing device with nitrogen protection according to claim 1, characterized in that: A screw cap (6) is provided inside the housing (1), and the screw cap (6) is threadedly connected to the housing (1).

4. A two-stage magnetic fluid sealing device with nitrogen protection according to claim 1, characterized in that: A bearing (8) is installed inside the housing (1), a bearing sleeve (9) is fixedly connected to one side of the bearing (8), and two bearings (8) are provided.

5. A two-stage magnetic fluid sealing device with nitrogen protection according to claim 1, characterized in that: An O-type sealing ring (10) is arranged inside the housing (1), and two O-type sealing rings (10) are arranged at two ends of the housing (1) respectively.

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