A floating magnetic force seal mechanism

Abstract

This utility model provides a floating magnetic sealing mechanism, installed between a device housing and a shaft. The shaft passes through the device housing, and the two rotate relative to each other, with the gap between them forming a sealing cavity. The floating magnetic sealing mechanism includes a floating ring with an annular groove on its inner surface. A sealing ring is installed in the groove. The floating ring is fitted onto the outer surface of the shaft and magnetically adheres to the outer wall of the device housing, with the sealing ring in tight contact with the shaft for sealing. This mechanism effectively seals the gap between the device housing and the shaft, providing good sealing performance, long service life, and good anti-sway effect.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, specifically to a floating magnetic sealing mechanism. Background Technology

[0002] Mechanical seals are devices that prevent fluid leakage within the equipment housing. Contact seals and labyrinth seals are two main types of mechanical seals. A labyrinth seal consists of several sequentially arranged annular sealing teeth around the shaft. These teeth form a series of flow-blocking gaps and expansion cavities. The sealed medium experiences a throttling effect as it passes through the tortuous labyrinth gaps, thus preventing leakage. Because there is a gap between the rotor and the housing in a labyrinth seal, there is no solid contact, and thermal expansion is allowed. Therefore, it is suitable for high-temperature, high-pressure, and high-speed / frequency applications. This type of seal is widely used for shaft end sealing and interstage sealing in steam turbines, gas turbines, compressors, and blowers. However, for applications requiring high sealing performance, contact seals are typically used to seal the shaft. Contact seals have a very low leakage rate of the sealed medium, ensuring zero leakage of the fluid in the sealed cavity, and also preventing external contaminants from entering the sealed cavity. Besides high sealing performance requirements, a long service life is also required for the sealing device. In addition, when the shaft rotates, axial and radial runout is prone to occur, which can lead to sealing failure at the contact sealing surface or excessive wear of the sealing mechanism. Summary of the Invention

[0003] This invention provides a floating magnetic sealing mechanism that seals the gap between the equipment housing and the shaft, and has good sealing effect, long service life and good anti-sway effect.

[0004] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows: A floating magnetic sealing mechanism is installed between a device housing and a shaft, the shaft passing through the device housing, the two rotating relative to each other, and the gap between them forming a sealing cavity. The floating magnetic sealing mechanism includes: The floating ring has an integrally annular groove on its inner circular surface. A sealing ring is installed in the groove. The floating ring is sleeved on the outer circular surface of the shaft and is magnetically attached to the outer wall of the equipment housing. The sealing ring is in close contact with the shaft for sealing.

[0005] The inner circular surface of the floating ring is provided with an integrally annular groove near the equipment housing. A sealing filler is provided in the groove. The two end faces of the sealing filler are respectively pressed against the floating ring and the equipment housing, and the inner circular surface of the sealing filler is in close contact with the outer circular surface of the shaft.

[0006] An elastic clamp is provided on the outer circumference of the sealing packing, which clamps the sealing packing onto the shaft.

[0007] The floating ring has an integrally annular groove on its end face near the equipment housing. Sealing filler is placed in the groove and is in close contact with the outer wall of the equipment housing for sealing.

[0008] The sealing filler is packing or felt.

[0009] The floating ring has a groove on its end face near the equipment housing. A magnet is installed in the groove. The magnet is magnetically attracted and attached to the outer wall of the equipment housing, thereby attaching the floating ring to the outer wall of the equipment housing.

[0010] The floating magnetic sealing mechanism also includes a lip sealing ring. The lip sealing ring has an L-shaped cross-section and includes an axial sealing ring arranged along the axial direction and a fixed step that is an integral ring arranged along the radial direction. At least one sealing lip is provided on the inner circular surface of the axial sealing ring. The lip sealing ring is fitted onto the shaft so that the sealing lip is in close contact with the shaft for sealing. The fixed step is attached to and fixed to the outer end face of the floating ring away from the equipment housing.

[0011] The fixed step is attached to the floating ring by pressure plates and bolts.

[0012] An elastic clamp is provided on the outer circumference of the axial sealing ring. The axial sealing ring is tightened by the elastic clamp, so that the sealing lip and the shaft are always in close contact for sealing.

[0013] The axial sealing ring is provided with at least one sealing lip that is inclined toward the sealing cavity and another sealing lip that is inclined toward the outside.

[0014] Compared with the prior art, the floating magnetic sealing mechanism provided by this utility model has the following advantages: 1. In this utility model, the floating ring is magnetically attached to the equipment housing and fitted onto the rotating shaft. It is sealed by the tight contact between the floating ring and the rotating shaft, thereby sealing the gap between the equipment housing and the shaft, resulting in a good sealing effect. When the shaft rotates, the floating ring rotates accordingly, while always floating in contact with the equipment housing, ensuring that the floating ring and the sealing ring are always in tight contact with the equipment housing and the sealing ring, providing good anti-sway effect, reducing the wear of the sealing ring, and extending the service life of the sealing mechanism.

[0015] 2. In this utility model, the sealing effect is further ensured by setting the sealing packing, and when the floating ring floats, the sealing packing floats accordingly, ensuring the reliability of the seal.

[0016] 3. In this utility model, a double seal is achieved through a lip sealing ring, which further ensures the sealing effect. Moreover, the lip sealing ring floats together with the floating ring, providing good anti-sway effect. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of the floating magnetic sealing mechanism provided in Example 1; Figure 2 This is a schematic diagram of the overall structure of the floating magnetic sealing mechanism provided in Example 2; In the diagram: 1-Equipment housing, 2-Shaft, 3-Sealing cavity, 4-Floating ring, 5-Sealing ring, 6-Magnet, 7-Sealing packing, 8-Elastic clamp, 9-Axial sealing ring, 10-Fixed step, 11-Pressure plate, 12-Bolt. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings. Example

[0019] The floating magnetic sealing mechanism provided in this embodiment is as follows: Figure 1 As shown, a magnetic sealing mechanism is installed between the equipment housing 1 and the shaft 2, with the shaft passing through the equipment housing. The two rotate relative to each other, and the gap between them forms a sealing cavity 3. The floating magnetic sealing mechanism includes a floating ring 4. The inner surface of the floating ring has an integrally annular groove, within which a sealing ring 5 is installed. The floating ring is fitted onto the outer surface of the shaft and magnetically adheres to the outer wall of the equipment housing, ensuring a tight seal between the sealing ring and the shaft. When the shaft rotates, the floating ring rotates accordingly, while simultaneously floating and adhering to the equipment housing, ensuring that the floating ring and sealing ring are always in tight contact with the equipment housing and the sealing ring, and reducing wear on the sealing ring. Specifically, a groove is provided on the end face of the floating ring near the equipment housing, within which a magnet 6 is installed. The magnet magnetically adheres to the outer wall of the equipment housing, thereby holding the floating ring against the outer wall of the equipment housing.

[0020] In this embodiment, the inner circular surface of the floating ring near the equipment housing has an integrally annular groove. A sealing filler 7 is placed within the groove, with its two end faces pressed tightly against the floating ring and the equipment housing, respectively. The inner circular surface of the sealing filler is also in close contact with the outer circular surface of the shaft. Specifically, an elastic clamp 8 is provided on the outer circular surface of the sealing filler, which secures the sealing filler to the shaft. The floating ring has an integrally annular groove on its end face near the equipment housing, with the sealing filler placed within the groove. The sealing filler makes tight contact with the outer wall of the equipment housing for sealing. When the floating ring floats, the sealing filler floats accordingly, further sealing the equipment housing and shaft through the sealing filler, ensuring reliable sealing. Further, the sealing filler is packing or felt. Example

[0021] The floating magnetic sealing mechanism provided in this embodiment adds an extra seal to the structure of embodiment 1. Its structure is as follows: Figure 2As shown. The same structure as in Embodiment 1 will not be described here; only the added seal will be explained. The added seal is a lip sealing ring with an L-shaped cross-section, including an axial sealing ring 9 arranged axially and a radially arranged, integrally annular fixed step 10. At least one sealing lip is provided on the inner circular surface of the axial sealing ring. Specifically, the axial sealing ring has three sealing lips inclined towards the sealing cavity and one sealing lip inclined towards the outside. The sealing lip inclined towards the outside is used for dust prevention. The lip sealing ring is fitted onto the shaft, ensuring tight contact and sealing between the sealing lip and the shaft. The fixed step is abutted and fixed to the outer end face of the floating ring away from the equipment housing, further ensuring the sealing effect. Specifically, the fixed step is abutted and fixed to the floating ring by a pressure plate 11 and bolts 12. In this embodiment, an elastic clamp is provided on the outer circular surface of the axial sealing ring, which tightens the axial sealing ring, ensuring that the sealing lip and the shaft are always in tight contact and sealing.

Claims

1. A floating magnetic sealing mechanism, installed between a device housing and a shaft, the shaft passing through the device housing, the two rotating relative to each other and the gap between them forming a sealing cavity, characterized in that: The floating magnetic sealing mechanism includes: The floating ring has an integrally annular groove on its inner circular surface. A sealing ring is installed in the groove. The floating ring is sleeved on the outer circular surface of the shaft and is magnetically attached to the outer wall of the equipment housing. The sealing ring is in close contact with the shaft for sealing.

2. The floating magnetic sealing mechanism according to claim 1, characterized in that: The inner circular surface of the floating ring is provided with an integrally annular groove near the equipment housing. A sealing filler is provided in the groove. The two end faces of the sealing filler are respectively pressed against the floating ring and the equipment housing, and the inner circular surface of the sealing filler is in close contact with the outer circular surface of the shaft.

3. The floating magnetic sealing mechanism according to claim 2, characterized in that: An elastic clamp is provided on the outer circumference of the sealing packing, which clamps the sealing packing onto the shaft.

4. The floating magnetic sealing mechanism according to claim 1, characterized in that: The floating ring has an integrally annular groove on its end face near the equipment housing. Sealing filler is placed in the groove and is in close contact with the outer wall of the equipment housing for sealing.

5. The floating magnetic sealing mechanism according to any one of claims 2-4, characterized in that: The sealing filler is packing or felt.

6. The floating magnetic sealing mechanism according to claim 1, characterized in that: The floating ring has a groove on its end face near the equipment housing. A magnet is installed in the groove. The magnet is magnetically attracted and attached to the outer wall of the equipment housing, thereby attaching the floating ring to the outer wall of the equipment housing.

7. The floating magnetic sealing mechanism according to claim 1, characterized in that: The floating magnetic sealing mechanism also includes a lip sealing ring. The lip sealing ring has an L-shaped cross-section and includes an axial sealing ring arranged along the axial direction and a fixed step that is an integral ring arranged along the radial direction. At least one sealing lip is provided on the inner circular surface of the axial sealing ring. The lip sealing ring is fitted onto the shaft so that the sealing lip is in close contact with the shaft for sealing. The fixed step is attached to and fixed to the outer end face of the floating ring away from the equipment housing.

8. The floating magnetic sealing mechanism according to claim 7, characterized in that: The fixed step is attached to the floating ring by pressure plates and bolts.

9. The floating magnetic sealing mechanism according to claim 7, characterized in that: An elastic clamp is provided on the outer circumference of the axial sealing ring. The axial sealing ring is tightened by the elastic clamp, so that the sealing lip and the shaft are always in close contact for sealing.

10. The floating magnetic sealing mechanism according to claim 7, characterized in that: The axial sealing ring is provided with at least one sealing lip that is inclined toward the sealing cavity and another sealing lip that is inclined toward the outside.

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