Magnetic confinement large-diameter lip sealing system for rotating shaft

Abstract

The utility model discloses a magnetic confinement large-diameter lip-shaped sealing system for a rotating shaft, which is characterized by comprising a rubber seal (1), a magnetic rubber ring (2), a support ring (3), a rotating shaft (4) and a sealing cavity (5), the magnetic rubber ring (2) is embedded in the rubber seal (1), the support ring (3) is arranged in the sealing cavity (5), and the rotating shaft (4) is arranged in the sealing cavity (5). And the rubber seal (1) is fixed between two adjacent support rings (3). According to the oil seal, appropriate radial force can be provided by controlling the magnetic force of the magnetic rubber ring (2), when the lip is abraded, the magnetic rubber ring (2) is closer to a rotating shaft (4), the magnetic force is increased, the radial force reduced due to the abrasion of the lip is compensated, and then the radial force of the oil seal lip is maintained at a relatively stable level for a long time.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sealed technical field, concretely relates to a kind of magnetic constraint large-diameter lip seal system for rotating shaft. BACKGROUND

[0002] The main drive sealing ring of shield machine is the "immune system" of shield machine, once the main drive seal is found to leak, shield machine will be paralyzed and cannot run, and shield machine sealing replacement cost is high, so the life and reliability of the main drive seal of shield machine are very important.

[0003] The radial force of the main drive sealing lip of active shield machine can gradually decrease with the wear of sealing lip, and then the reliability and service life of the seal are reduced. Therefore, it is necessary to develop a sealing system with reduced radial force reduction after sealing lip wear. UTILITY MODEL CONTENT

[0004] Technical scheme:

[0005] In order to solve the above problems, the utility model takes a new design scheme. The utility model relates to a kind of magnetic constraint large-diameter lip seal system for rotating shaft, and its characterized in that it includes rubber seal (1), magnetic rubber ring (2), support ring (3), rotating shaft (4) and sealing cavity (5),

[0006] The rubber seal (1) is embedded with the magnetic rubber ring (2),

[0007] The support ring (3) is arranged inside the sealing cavity (5), and the rubber seal (1) is fixed between the adjacent two support rings (3).

[0008] Preferably, the magnetic rubber ring (2) is located in the lip region of the rubber seal (1).

[0009] Preferably, the number of rubber seals (1) and support rings (3) is more than two, and they are arranged axially spaced along the sealing cavity (5).

[0010] Preferably, the lips of the two rubber seals (1) located at the outermost side of the sealing cavity (5) are reversely arranged.

[0011] After the wear of the lip of the rubber seal (1), the magnetic rubber ring (2) is closer to the rotating shaft (4), which makes up for the reduced radial force due to the wear of the lip.

[0012] The magnetic rubber ring (2) is a soft magnet filled with a large amount of magnetic powder based on rubber.

[0013] The rubber seal (1) and the magnetic rubber ring (2) semi-finished product are co-extruded by an extruder, so that the relative position of the magnetic rubber ring (2) in the rubber seal (1) is ensured, and then vulcanization is performed by using a mold and a flat plate vulcanizer. In this way, the rubber seal (1) and the magnetic rubber ring (2) are thermally bonded as a whole during vulcanization.

[0014] The magnetic force of the magnetic rubber ring (2) can be controlled by adjusting the type and content of the filled magnetic powder, so that a suitable radial force is provided. When the lip is worn, the soft magnetic constraint ring (2) is closer to the rotating shaft (4), the magnetic force is increased, the radial force of the oil seal lip is compensated for the decrease caused by the wear of the lip, and the radial force of the oil seal lip is maintained at a relatively stable level for a long time.

[0015] The utility model discloses a magnetic constraint large-diameter lip seal system for a rotating shaft, which can solve the problem that the sealing radial force of a traditional large rotating shaft lip seal decreases too fast with the wear of the sealing lip, thereby prolonging the service life of the seal.

[0016] The sealing system has reliable performance, long service life, convenient installation, good universality and interchangeability, and is particularly suitable for high-sealing requirements such as shield machines and ship tail shaft sealing.

[0017] The utility model will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a structural diagram of the magnetic constraint large-diameter lip seal system.

[0019] Figure 2 Fig. 2 is a sectional view of the magnetic constraint large-diameter lip seal semi-finished product.

[0020] Figure 3 Fig. 3 is an application example diagram of the magnetic constraint large-diameter lip seal system.

[0021] Wherein:

[0022] Figure 1 Fig. 1 is a structural diagram of the magnetic constraint large-diameter lip seal system.

[0023] Figure 2 Fig. 2 is a sectional view of the magnetic constraint large-diameter lip seal semi-finished product.

[0024] Figure 3 Fig. 1 is a structural diagram of the magnetic constraint large-diameter lip seal system. DETAILED DESCRIPTION

[0025] Embodiment:

[0026] A magnetic constraint large-diameter lip seal system for a rotating shaft, comprising a rubber seal (1), a magnetic rubber ring (2), a support ring (3), a rotating shaft (4) and a sealing cavity (5), the magnetic rubber ring (2) is embedded in the rubber seal (1), the support ring (3) is arranged inside the sealing cavity (5), and the rubber seal (1) is fixed between two adjacent support rings (3).

[0027] The preparation method of the magnetic constraint large-diameter lip seal system.

[0028] First step, rubber mixing. The rubber seal (1) is mixed using a mixer and an open mill. The main body of the magnetic rubber ring (2) is rubber filled with a large amount of magnetic powder, which is processed by rubber mixing process. The magnetic rubber ring (2) is mixed using a mixer and an open mill.

[0029] Second step, co-extrusion. The rubber seal (1) and the magnetic rubber ring (2) are co-extruded using an extruder to form the structure of the rubber seal (1) embedded with the magnetic rubber ring (2). The cross section is shown in Figure 2 .

[0030] Third step, using a flat vulcanizing machine and a mold, vulcanizing a magnetic constraint large-diameter lip seal finished product, which can be processed in two ways: integral mold pressing vulcanization and segmented vulcanization.

[0031] Fourth step, using machining method to process support ring (3), rotating shaft (4) and sealing cavity (5).

[0032] Fifth step, in the sealing cavity (5), the rubber seal (1) is fixed between two adjacent support rings (3).

[0033] Preferably, the magnetic rubber ring (2) is located in the lip area of the rubber seal (1), which can better compensate for the reduced radial force due to lip wear.

[0034] Preferably, the number of rubber seals (1) and support rings (3) is more than two, which are arranged axially along the sealing cavity (5) to provide better sealing effect.

[0035] Preferably, the lips of the two rubber seals (1) located at the outermost side of the sealing cavity (5) are arranged in opposite directions to achieve the effect of axial bidirectional sealing.

[0036] The magnetic constraint large-diameter lip-shaped sealing system can provide appropriate radial force, when the lip is worn, the magnetic rubber ring (2) is closer to the rotating shaft (4), the magnetic force is increased to compensate the reduced radial force due to the wear of the lip, and the radial force of the oil seal lip is maintained at a relatively stable level for a long time.

[0037] Of course, the above description is not a limitation of the utility model, and the utility model is not limited to the above examples. Within the essential scope of the utility model, changes, modifications, additions or replacements made by ordinary skilled in the art should belong to the protection scope of the utility model.

Claims

1. A magnetic confinement large diameter lip seal system for a rotating shaft, characterized in that It comprises a rubber seal (1), a magnetic rubber ring (2), a support ring (3), a rotating shaft (4) and a sealing cavity (5), The magnetic rubber ring (2) is embedded in the rubber seal (1), The support ring (3) is arranged inside the sealing cavity (5), and the rubber seal (1) is fixed between two adjacent support rings (3).

2. The magnetic confinement large diameter lip seal system for a rotating shaft of claim 1, characterized in that The magnetic rubber ring (2) is located in the lip area of the rubber seal (1).

3. The magnetic confinement large diameter lip seal system for a rotating shaft of claim 1, wherein The number of the rubber seal (1) and the support ring (3) is more than two, and they are arranged axially along the sealing cavity (5).

4. The magnetic confinement large diameter lip seal system for a rotating shaft of claim 3, characterized in that The lips of the two rubber seals (1) located at the outermost sides of the sealing cavity (5) are arranged in opposite directions.

Images