Box type sealing device

Abstract

The utility model provides a box type sealing device which comprises a movable ring and a static ring, the movable ring comprises a movable connecting ring arranged in the axial direction and a movable sealing ring arranged in the radial direction, and a rotating shaft is fixedly sleeved with the movable connecting ring; the static ring comprises a static connecting ring and a static sealing ring, the static connecting ring is arranged in the axial direction and fixed in the bearing end cover in an attached mode, and the static sealing ring is connected to the inner circle face of the static connecting ring. A main sealing lip, a first auxiliary sealing lip and a second auxiliary sealing lip are arranged at the end, away from the static connecting ring, of the static sealing ring, the main sealing lip is hooped on the outer circle face of the movable connecting ring through a hooping spring, the first auxiliary sealing lip is in interference fit with the movable connecting ring, and the second auxiliary sealing lip is in interference fit with the movable sealing ring. According to the box type sealing device, axial and radial tight contact sealing is conducted on the movable ring through the main sealing lip, the first auxiliary sealing lip and the second auxiliary sealing lip which are arranged on the static ring, the sealing effect is good, and the service life of the sealing device is long.

Description

Technical Field

[0001] This utility model provides a sealing device, and more particularly provides a device for sealing a rotating shaft, belonging to the field of mechanical seal technology. Background Technology

[0002] Contact seals and labyrinth seals are two main types of mechanical seals. A labyrinth seal consists of several sequentially arranged annular sealing teeth around a rotating 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 labyrinthine gaps, thus preventing leakage. Because there is a gap between the rotor and the casing in a labyrinth seal, there is no solid contact, and thermal expansion is permissible. 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.

[0003] However, in applications requiring high sealing performance, contact seals are typically used to seal rotating shafts. Contact seals offer a very low leakage rate of the sealed medium, ensuring zero leakage of lubricating oil within the sealing cavity and preventing external contaminants from entering. Furthermore, there are stringent requirements regarding the service life of the sealing device.

[0004] Currently, there are many different types of sealing devices available in this field, with varying structures and sealing performances. However, in general, providing a sealing device that is simple in structure, has good sealing performance, and a long service life remains a common aspiration among those skilled in the art. Summary of the Invention

[0005] This utility model provides a box-type sealing device. The box-type sealing device uses a main sealing lip, a first secondary sealing lip, and a second secondary sealing lip provided on the stationary ring to achieve axial and radial tight contact sealing of the rotating ring, resulting in good sealing effect. Moreover, the main sealing lip is clamped by a clamping spring, which can ensure that the main sealing lip is always in tight contact with the rotating ring, and the sealing device has a long service life.

[0006] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows:

[0007] A box-type sealing device is installed between a rotating shaft and a bearing end cover. The rotating shaft is installed inside the bearing end cover and extends out of the bearing end cover. The gap between the rotating shaft and the bearing end cover is a sealing cavity. The box-type sealing device includes:

[0008] The rotating ring includes a rotating connecting ring arranged along the axial direction and a rotating sealing ring arranged along the radial direction. The rotating connecting ring is fixedly sleeved on the rotating shaft, so that the rotating ring is fixed on the rotating shaft as a whole and rotates with the rotating shaft.

[0009] The stationary ring includes a stationary connecting ring and a stationary sealing ring, wherein the stationary connecting ring is arranged axially and is fixed against the bearing end cover, and the stationary sealing ring is connected to the inner circular surface of the stationary connecting ring.

[0010] The end of the static sealing ring away from the static connecting ring is provided with a main sealing lip, a first secondary sealing lip, and a second secondary sealing lip. The main sealing lip is clamped to the outer circumference of the moving connecting ring by a clamping spring. The first secondary sealing lip is interference-fitted with the moving connecting ring, and the edge of the first secondary sealing lip is in close contact with the moving connecting ring and seals it. The second secondary sealing lip is interference-fitted with the moving sealing ring, and the edge of the second secondary sealing lip is in close contact with the moving sealing ring and seals it.

[0011] The dynamic sealing ring is connected to the outer circular surface of the dynamic connecting ring at the end away from the sealing cavity. One or more dustproof lips are provided on the outer circular surface of the dynamic sealing ring. The dustproof lips are interference-fitted with the stationary connecting ring and the edge of the dustproof lips is in close contact with the inner circular surface of the stationary connecting ring.

[0012] The moving ring is fitted with a first skeleton.

[0013] The stationary ring is fitted with a second skeleton.

[0014] The main sealing lip is provided with a spring groove, and the clamping spring is installed in the spring groove to clamp the main sealing lip.

[0015] The static connecting ring is fixed to the bearing end cover by an interference fit.

[0016] Compared with existing technologies, the box-type sealing device provided by this utility model has the following advantages: 1. The box-type sealing device provided by this utility model has a simple structure. The main sealing lip, the first secondary sealing lip, and the second secondary sealing lip on the stationary ring achieve axial and radial tight contact sealing of the rotating ring, resulting in good sealing performance. Furthermore, the main sealing lip is tightened by a clamping spring, ensuring that it always maintains tight contact with the rotating ring, thus extending the service life of the sealing device. 2. In this utility model, a dustproof lip is provided on the rotating ring. This dustproof lip maintains tight contact with the stationary ring, preventing external contaminants from entering the sealing cavity, further extending the service life of the sealing device. 3. In this utility model, a first skeleton is provided on the rotating ring, and a second skeleton is provided on the stationary ring, supporting the rotating and stationary rings and improving the anti-sway performance of the oil seal device. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of the box-type sealing device provided by this utility model;

[0018] In the diagram: 1-Rotating shaft, 2-Bearing end cover, 3-Sealing cavity, 4-Dynamic connecting ring, 5-Dynamic sealing ring, 6-First skeleton, 7-Static connecting ring, 8-Static sealing ring, 9-Main sealing lip, 10-Clamping spring, 11-First secondary sealing lip, 12-Second secondary sealing lip, 13-Second skeleton, 14-Dustproof lip. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings.

[0020] The structure of the box-type sealing device provided by this utility model is as follows: Figure 1 As shown, it is installed between the rotating shaft 1 and the bearing end cover 2. The rotating shaft is installed inside the bearing end cover and extends out of the bearing end cover. The gap between the rotating shaft and the bearing end cover is a sealing cavity 3. The gap between the rotating shaft and the bearing end cover is sealed by a box-type sealing device.

[0021] The box-type sealing device includes a rotating ring and a stationary ring. The rotating ring includes a moving connecting ring 4 arranged axially and a moving sealing ring 5 arranged radially. The moving connecting ring is fixedly sleeved on the rotating shaft, so that the rotating ring is fixed on the rotating shaft as a whole and rotates with the rotating shaft. In this embodiment, the moving sealing ring is connected to the outer circumference of the end of the moving connecting ring away from the sealing cavity, see... Figure 1 .

[0022] The stationary ring includes a stationary connecting ring 7 and a stationary sealing ring 8. The stationary connecting ring is arranged axially and is fixed against the bearing end cover. Specifically, the stationary connecting ring is fixed to the bearing end cover by an interference fit.

[0023] The static sealing ring is connected to the inner circular surface of the static connecting ring. The end of the static sealing ring away from the static connecting ring is provided with a main sealing lip 9, a first secondary sealing lip 11, and a second secondary sealing lip 12. The main sealing lip is clamped to the outer circular surface of the moving connecting ring by a clamping spring 10. Specifically, the main sealing lip is provided with a spring groove, and the clamping spring is installed in the spring groove to clamp the main sealing lip.

[0024] The first sealing lip is interference-fitted with the moving connecting ring, and its edge is in close contact with the moving connecting ring for sealing. The second sealing lip is also interference-fitted with the moving sealing ring, and its edge is in close contact with the moving sealing ring for sealing. Radial and axial contact sealing is achieved through the main sealing lip, the first sealing lip, and the second sealing lip, resulting in a good sealing effect.

[0025] In this embodiment, two dustproof lips 14 facing opposite directions are provided on the outer circular surface of the dynamic sealing ring. The dustproof lips are interference-fitted with the stationary connecting ring, and the edge of the dustproof lip is in close contact with the inner circular surface of the stationary connecting ring to prevent external contaminants from entering the sealing cavity.

[0026] In this embodiment, a first skeleton 6 is embedded on the moving ring, and the first skeleton is embedded on the outer circular surface of the moving connecting ring. Therefore, both the main sealing lip and the first secondary sealing lip are in close contact with the outer circular surface of the first skeleton for sealing. In this embodiment, a second skeleton 13 is embedded on the stationary ring, and the second skeleton supports the stationary ring, and the dustproof lip is in close contact with the second skeleton on the outer circular surface of the stationary connecting ring for sealing. The entire sealing device has good anti-sway performance.

Claims

1. A box-type sealing device, installed between a rotating shaft and a bearing end cover, wherein the rotating shaft is installed inside the bearing end cover and extends out of the bearing end cover, and the gap between the rotating shaft and the bearing end cover is a sealing cavity, characterized in that: The box-type sealing device includes: The rotating ring includes a rotating connecting ring arranged along the axial direction and a rotating sealing ring arranged along the radial direction. The rotating connecting ring is fixedly sleeved on the rotating shaft, so that the rotating ring is fixed on the rotating shaft as a whole and rotates with the rotating shaft. The stationary ring includes a stationary connecting ring and a stationary sealing ring, wherein the stationary connecting ring is arranged axially and is fixed against the bearing end cover, and the stationary sealing ring is connected to the inner circular surface of the stationary connecting ring. The end of the static sealing ring away from the static connecting ring is provided with a main sealing lip, a first secondary sealing lip, and a second secondary sealing lip. The main sealing lip is clamped to the outer circumference of the moving connecting ring by a clamping spring. The first secondary sealing lip is interference-fitted with the moving connecting ring, and the edge of the first secondary sealing lip is in close contact with the moving connecting ring and seals it. The second secondary sealing lip is interference-fitted with the moving sealing ring, and the edge of the second secondary sealing lip is in close contact with the moving sealing ring and seals it.

2. The box-type sealing device according to claim 1, characterized in that: The dynamic sealing ring is connected to the outer circular surface of the dynamic connecting ring at the end away from the sealing cavity. One or more dustproof lips are provided on the outer circular surface of the dynamic sealing ring. The dustproof lips are interference-fitted with the stationary connecting ring and the edge of the dustproof lips is in close contact with the inner circular surface of the stationary connecting ring.

3. The box-type sealing device according to claim 1, characterized in that: The moving ring is fitted with a first skeleton.

4. The box-type sealing device according to claim 1, characterized in that: The stationary ring is fitted with a second skeleton.

5. The box-type sealing device according to claim 1, characterized in that: The main sealing lip is provided with a spring groove, and the clamping spring is installed in the spring groove to clamp the main sealing lip.

6. The box-type sealing device according to claim 1, characterized in that: The static connecting ring is fixed to the bearing end cover by an interference fit.

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