A main shaft cloth sealing structure

Abstract

The present invention discloses a main shaft cloth sealing structure, which includes a cloth frame, a flexible waist, an elastic component installation groove, a main lip and an auxiliary lip. The upper end of the flexible waist is fixedly connected to the cloth frame, and the lower end is provided with the elastic component installation groove, the main lip and the auxiliary lip. The elastic component installation groove is installed with an elastic component that provides radial force for the oil seal. The main lip is close to the air side, and the auxiliary lip is close to the grease side. The main lip and the auxiliary lip are in a "human" shape, and the gap between the two constitutes a friction-reducing space. The waist of the present invention has good flexibility, and the lip can have good shaft-following performance when the shaft radially runs out, especially when the radial runout is relatively large, so that it can keep in contact with the shaft at all times; and a secondary lip is added to the inner side of the main lip to play a role of preliminary sealing. At the same time, the deformation of the auxiliary lip under the condition of internal pressure provides radial force to the main lip, so as to achieve a better sealing effect.

Description

Technical Field

[0001] The invention belongs to the field of bearing seals, and in particular relates to a main shaft cloth-clamped seal structure. Background Art

[0002] With the rapid development of the times, it is an inevitable trend for new clean energy to replace traditional energy. The trajectory and law of energy development is from high carbon to low carbon, from low efficiency to high efficiency, from unclean to clean, and from unsustainable to sustainable. The development and utilization of renewable clean energy resources such as wind energy is in line with the trajectory of energy development. The main shaft of wind power generation is in a long-term operation state. In order to ensure normal operation, the main shaft bearing must be lubricated with grease. The existing sealing structure generally cannot seal the grease and causes grease leakage, which shortens the life of the main shaft and increases the cost of use. Summary of the invention

[0003] The object of the present invention is to provide a main shaft cloth sealing structure, which has a lip-shaped sealing structure with an auxiliary lip at the main sealing lip, and the waist is flexible and has good shaft-following performance, and has a good sealing effect for solving the problem of large radial runout of bearings.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a main shaft cloth sealing structure, which includes a cloth frame, a flexible waist, an elastic component mounting groove, a main lip and an auxiliary lip, the upper end of the flexible waist is fixedly connected to the cloth frame, and the lower end is provided with the elastic component mounting groove, the main lip and the auxiliary lip, an elastic component providing radial force for the oil seal is installed in the elastic component mounting groove, the main lip is close to the air side, the auxiliary lip is close to the grease side, and the main lip and the auxiliary lip are in a "human" shape, and the gap between the two constitutes a friction-reducing space.

[0005] Furthermore, the cloth frame is used for supporting and preventing heel rotation, and is made of dipped cotton cloth which is hardened by vulcanization and assembled in a sealing groove and fixed by a pressing plate.

[0006] Furthermore, the flexible waist, the elastic component installation groove, the main lip and the auxiliary lip are made of rubber vulcanization and are an integrally formed structure.

[0007] Furthermore, the elastic component installation groove is a spring groove, and the elastic component installed inside the spring groove is a spring.

[0008] Furthermore, the main lip is interference fit with the shaft, and the auxiliary lip is used to assist the main lip in sealing grease.

[0009] Furthermore, the cross section of the flexible waist is "C"-shaped.

[0010] Furthermore, the main shaft cloth sealing structure is an integral or split structure.

[0011] The beneficial effects of the present invention are as follows: in the sealing structure, the waist has good flexibility, and the lip can have good shaft-following performance when the shaft radially runs out, especially when the radial runout is relatively large, so that it can always keep in contact with the shaft. A secondary lip is added to the inner side of the main lip, and the diameter of the secondary lip is smaller than that of the main lip, which plays a role of preliminary sealing. When the shaft is radially displaced, the secondary lip is deformed. At the same time, when the secondary lip is subjected to the internal pressure of the bearing, the deformation provides radial force to the main lip, thereby achieving a better sealing effect.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention.

[0014] Markings in the figure are: 1-cloth frame, 2-flexible waist, 3-spring groove, 4-main lip, 5-auxiliary lip, 6-axis, 7-friction reduction space. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] like Figure 1 As shown, a main shaft cloth sealing structure comprises a cloth frame 1, a flexible waist 2, an elastic component mounting groove, a main lip 4 and an auxiliary lip 5, wherein the upper end of the flexible waist 2 is fixedly connected to the cloth frame 1, and the lower end is provided with the elastic component mounting groove, the main lip 4 and the auxiliary lip 5, wherein an elastic component providing radial force for the oil seal is installed in the elastic component mounting groove, the main lip 4 is close to the air side, and the auxiliary lip 5 is close to the grease side, and the main lip 4 and the auxiliary lip 5 are in a "human" shape structure, and the gap between the two constitutes a friction reduction space 7.

[0017] In this embodiment, the cloth frame 1 is used to support and prevent heel rotation. It is made of dipped cotton cloth that is hardened by vulcanization and assembled in the sealing groove and fixed by a pressing plate. The flexible waist 2, elastic component installation groove, main lip 4 and auxiliary lip 5 are made of rubber vulcanization and are an integrally formed structure. The elastic component installation groove is a spring groove 3, and the elastic component installed inside it is a spring. The main lip 4 is an interference fit with the shaft, and the auxiliary lip 5 is used to assist the main lip 4 in sealing grease. The main shaft cloth sealing structure can be an integral or split structure.

[0018] Working principle of the present invention: one end of the flexible waist is connected to the fabric frame, and the other end is connected to the main lip. The cross section is "C"-shaped with the fabric frame. When the shaft performs radial positive vibration, the "C"-shaped structure can provide rubber for storing the squeezed lip part. When the shaft performs radial negative vibration, the "C"-shaped waist B can be straightened to compensate for the gap between the shaft and the seal when the shaft is away from the main lip and the auxiliary lip of the seal, thereby having excellent shaft-following performance and achieving a sealing effect. The auxiliary lip is a "\"-shaped thin lip formed by rubber vulcanization, which is on the inner side of the main lip. The diameter of the auxiliary lip is smaller than that of the main lip, and it first contacts the shaft surface to achieve a preliminary sealing effect. Under internal pressure, the grease pressure acts on the X surface, making the auxiliary lip close to the rotating shaft, preventing the grease from entering the friction-reducing space, thereby avoiding the grease force on the Y surface causing the seal to be lifted by the grease and cause grease leakage; at the same time, there is a friction-reducing space between the auxiliary lip and the main lip, which reduces the contact area between the auxiliary lip and the shaft, thereby reducing the friction generated by the relative movement with the shaft; the spring in the spring groove provides radial force to the main lip and the auxiliary lip, achieving a better sealing effect.

[0019] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the protection scope of the present invention in any form, and all technical solutions obtained by equivalent replacement and the like fall within the protection scope of the present invention.

[0020] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims

1. A main shaft cloth sealing structure, characterized in that: It includes a cloth frame, a flexible waist, an elastic component mounting groove, a main lip and an auxiliary lip. The upper end of the flexible waist is fixedly connected to the cloth frame, and the lower end is provided with the elastic component mounting groove, the main lip and the auxiliary lip. The elastic component mounting groove is installed with an elastic component that provides radial force for the oil seal. The main lip is close to the air side, and the auxiliary lip is close to the grease side. The main lip and the auxiliary lip are in a "human" shape, and the gap between the two constitutes a friction reduction space. The cloth frame is used for supporting and preventing heel rotation. It is made of dipped cotton cloth that is hardened by vulcanization and assembled in the sealing groove and fixed by a pressing plate. The flexible waist, the elastic component mounting groove, the main lip and the auxiliary lip are made of rubber vulcanization and are an integrally formed structure. The elastic component mounting groove is a spring groove, and the elastic component installed inside it is a spring. The main lip is interference fit with the shaft, and the auxiliary lip is used to assist the main lip in sealing grease. The cross section of the flexible waist is in a "C" shape, and the diameter of the auxiliary lip is smaller than the diameter of the main lip.

2. A main shaft cloth sealing structure according to claim 1, characterized in that: The main shaft cloth-clamped sealing structure is an integral or split structure.

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