Low-friction self-lubricating high-pressure sealing system for rotating shaft

Abstract

The utility model discloses a low-friction high-pressure sealing system for a rotating shaft, which is characterized by comprising a lip seal, a support ring (3), a compression ring (4), the rotating shaft (5) and a cavity (6), the lip seal comprises a base body part (1) made of rubber fiber composite materials and a lip part (2) made of self-lubricating rubber fiber composite materials, the supporting ring (3) and the pressing ring (4) fix the lip seal in the axial direction, the lip portion (2) made of the self-lubricating rubber fiber composite material makes contact with the rotating shaft (5), and the rotating shaft (5) is located in the cavity (6). The sealing system is reliable in performance, long in service life, convenient to install, good in universality and interchangeability and particularly suitable for occasions with large sealing pressure such as shield tunneling machines and ship tail shaft sealing.

Description

TECHNICAL FIELD

[0001] The utility model relates to a technical field of sealing, specifically relates to a low friction high pressure sealing system for rotating shaft. BACKGROUND

[0002] The shield machine main drive sealing ring is the core component of the shield machine, once the sealing appears the problem, the shield machine will be paralyzed and cannot run, and the shield machine sealing is difficult to replace, and the replacement cost is very high, therefore, the sealing system is very important.

[0003] At present, the shield machine faces the situation that the water pressure is higher when the large buried depth construction, and the pressure resistance of the sealing system is higher. The maximum design pressure capacity of the shield sealing is 10bar. When the large buried depth construction, the water pressure is higher, sometimes the water pressure reaches 100bar, and the sealing system in service cannot meet the requirement.

[0004] Therefore, it is necessary to develop a high pressure sealing system suitable for the working condition. UTILITY MODEL CONTENT

[0005] Technical scheme:

[0006] In order to solve the above problem, the utility model takes a new design scheme. The utility model relates to a low friction high pressure sealing system for rotating shaft, and the sealing system is characterized by comprising a lip seal, a support ring, a pressure ring, a rotating shaft and a cavity.

[0007] The support ring and the pressure ring fix the lip seal along the axial direction,

[0008] The lip part of the self-lubricating rubber fiber composite material is in contact with the rotating shaft, and the rotating shaft is located inside the cavity.

[0009] Preferably, the number of the lip seal, the support ring and the pressure ring is two or more, and the lip seal, the support ring and the pressure ring are arranged along the axial direction inside the cavity, so that the good sealing effect can be realized through the multiple sealing structure.

[0010] Preferably, the lip parts of the two lip seals located at the outermost side of the cavity along the axial direction are reversely arranged, so that the bidirectional sealing effect can be realized.

[0011] Preferably, the rotating shaft is hollow, and the cooling water can be passed to the low friction self-lubricating high pressure sealing for cooling.

[0012] The matrix of the rubber fiber composite material and the lip of the self-lubricating rubber fiber composite material are bonded together as a whole through vulcanization. The addition of fibers to the matrix of the rubber fiber composite material increases the elastic modulus of the lip seal and improves the compressive strength of the sealing lip. The addition of fibers to the lip of the self-lubricating rubber fiber composite material increases the material's elastic modulus, and the addition of self-lubricating material reduces the coefficient of friction of the sealing lip, thereby reducing the frictional temperature rise during relative movement between the lip and the rotating shaft.

[0013] The support ring supports the sealing lip, further improving the seal's high-pressure resistance. The support ring, pressure ring, and cavity together secure the lip seal. Cooling water circulates through the rotating shaft to cool the sealing lip. This ensures the seal remains undamaged under high pressure, and the temperature rise of the sealing lip remains within a controllable range during shaft rotation, extending its service life. This novel sealing system is reliable, has a long service life, is easy to install, and offers good versatility and interchangeability, making it particularly suitable for applications requiring high sealing pressure, such as tunnel boring machines and ship stern shaft seals.

[0014] This invention addresses the shortcomings of existing technologies by providing a low-friction, high-pressure sealing system for rotating shafts. This sealing structure can solve the problem of poor pressure resistance in traditional large rotating shaft seals.

[0015] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 Schematic diagram of a low-friction, self-lubricating, high-pressure sealing system

[0017] Figure 2 Cross-sectional diagram of low-friction self-lubricating high-pressure seal semi-finished product

[0018] Figure 3 Installation diagram of low-friction self-lubricating high-pressure sealing system

[0019] in:

[0020] Figure 1 In the middle: 1. Rubber sealing fiber reinforced part, 2. Rubber sealing fiber reinforced self-lubricating low friction part, 3. Support ring, 4. Pressure ring, 5. Rotating shaft, 6. Cavity.

[0021] Figure 2 In the middle: 1. Rubber-sealed fiber-reinforced part, 2. Rubber-sealed fiber-reinforced self-lubricating low-friction part.

[0022] Figure 3 In the middle: 1. Rubber sealing fiber reinforced part, 2. Rubber sealing fiber reinforced self-lubricating low friction part, 3. Support ring, 4. Pressure ring, 5. Rotating shaft, 6. Cavity. Detailed Implementation

[0023] Embodiment:

[0024] A low-friction high-pressure sealing system for a rotating shaft, comprising a lip seal, a support ring 3, a compression ring 4, a rotating shaft 5 and a cavity 6, the lip seal comprising a base part 1 of rubber fiber composite material and a lip part 2 of self-lubricating rubber fiber composite material,

[0025] The support ring 3 and the compression ring 4 axially fix the lip seal,

[0026] The lip part 2 of self-lubricating rubber fiber composite material is in contact with the rotating shaft 5, which is located inside the cavity 6.

[0027] The preparation method of the low-friction high-pressure sealing system.

[0028] First step, rubber mixing. The rubber mixing of the base part 1 of rubber fiber composite material and the lip part 2 of self-lubricating rubber fiber composite material is completed using a banbury mixer and an open mill.

[0029] Among them, the types of reinforcing fibers include aramid fiber, nylon fiber, carbon fiber and carbon nanotube, and the types of self-lubricating agents include polytetrafluoroethylene, polyether ether ketone, molybdenum disulfide and graphite.

[0030] Second step, co-extrusion. The rubber mixing of the base part 1 of rubber fiber composite material and the lip part 2 of self-lubricating rubber fiber composite material is co-extruded using an extruder, and the cross section of the extruded material is as shown in Figure 2 .

[0031] Third step, using a flat vulcanizing machine and a mold, vulcanizing a low-friction high-pressure sealing finished product, which can be processed in two ways: integral mold pressing vulcanization and segmented vulcanization.

[0032] Fourth step, using machining methods to process the support ring 3, the compression ring 4, the rotating shaft 5 and the cavity 6.

[0033] Fifth step, assembly. In the cavity 6, the support ring 3 and the compression ring 4 axially fix the lip seal, and the lip part 2 of self-lubricating rubber fiber composite material is in contact with the rotating shaft 5.

[0034] Preferably, the number of lip seals, support rings 3 and compression rings 4 is two or more, which are arranged axially inside the cavity 6, and through the multiple sealing structure, a good sealing effect can be achieved.

[0035] Preferably, the lip parts of the two lip seals located at the outermost side of the cavity 6 are reversely arranged, which can achieve the effect of bidirectional sealing.

[0036] Preferably, the rotating shaft 5 is hollow and internally passes cooling water to low-friction self-lubricating high-pressure seal cooling.

[0037] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Within the scope of the present application, changes, modifications, additions or substitutions made by those skilled in the art should be within the scope of the present application.

Claims

1. A low friction self-lubricating high pressure sealing system for a rotating shaft, characterized in that The lip seal comprises a base part (1) of rubber fiber composite material and a lip part (2) of self-lubricating rubber fiber composite material, The lip seal comprises a base part (1) of rubber fiber composite material and a lip part (2) of self-lubricating rubber fiber composite material, The support ring (3) and the compression ring (4) axially fix the lip seal, The lip part (2) of self-lubricating rubber fiber composite material is in contact with the rotating shaft (5), The rotating shaft (5) is located inside the cavity (6).

2. The sealing system of claim 1, wherein, The number of the lip seal and the support ring (3) and the compression ring (4) is more than two, which are arranged axially and spaced apart inside the cavity (6).

3. The sealing system of claim 2, wherein, The lip parts of the two lip seals located at the outermost sides in the axial direction inside the cavity (6) are arranged in opposite directions.

4. The sealing system of claim 1, wherein, The rotating shaft (5) is hollow.

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