A double-face axial multi-lip sealing device

Abstract

The utility model provides a double-end axial multi-lip sealing device, which is installed between a shaft and a bearing seat. The shaft is a stepped structure, including a large shaft and a small shaft. The end of the small shaft away from the large shaft is installed inside the bearing seat. The small shaft and the bearing seat rotate relatively and the gap between the two is a sealing cavity. The utility model is characterized in that: the double-end axial multi-lip sealing device includes: a support ring, which is tightly sleeved on the small shaft and located between the large shaft and the bearing seat; a multi-lip sealing part, which is annular as a whole, including a sealing ring and a sealing lip. The cross section of the sealing ring is an inverted "V" shape. The sealing lips are symmetrically arranged on the outer circumference of the sealing ring. The sealing ring is clamped on the outer circumference of the support ring, so that the sealing lips on both sides are closely contacted and sealed with the side walls of the large shaft and the bearing seat respectively. The sealing device performs double-end axial contact sealing on the sealing cavity through the sealing lips, has a good sealing effect, and maintains symmetrical and balanced sealing on both sides, and has a long service life.

Description

Technical Field

[0001] The utility model provides a sealing device, in particular provides a double-end surface axial multi-lip sealing device for sealing the gap between a bearing seat and a shaft, belonging to the technical field of mechanical sealing. Background Art

[0002] There is a gap between the bearing seat and the shaft, and a sealing device is usually installed between the bearing seat and the shaft to seal the lubricating grease and hydraulic oil. However, since the bearing seat and the shaft rotate relative to each other during operation, ordinary sealing devices are very likely to fail, which in turn leads to leakage of lubricating grease and hydraulic oil, polluting the working environment of the equipment.

[0003] In some occasions with strict requirements for use, the sealing device must not only achieve zero leakage of lubricating grease and hydraulic oil in the sealing cavity, but also prevent external pollutants from entering the sealing cavity. In addition, there are also high requirements for the service life of the seal. At present, there are many kinds of sealing device products in this field, with complex or simple structures and different sealing performances. However, in general, it is still a common expectation of technicians in this field to provide a sealing device with simple structure, good sealing performance, easy installation and long service life. Summary of the invention

[0004] The utility model provides a double-end axial multi-lip sealing device, which performs double-end axial contact sealing on a sealing cavity through sealing lips, has good sealing effect, maintains symmetrical and balanced sealing on both sides, and has a long service life.

[0005] The technical solution adopted to achieve the above-mentioned purpose of the utility model is:

[0006] A double-end axial multi-lip seal device is installed between a shaft and a bearing seat. The shaft is a stepped structure, including a large shaft and a small shaft. The end of the small shaft away from the large shaft is installed inside the bearing seat. The small shaft and the bearing seat rotate relative to each other and the gap between the two is a sealing cavity. The double-end axial multi-lip seal device includes:

[0007] A support ring, which fits tightly on the small shaft and is located between the large shaft and the bearing seat;

[0008] The multi-lip sealing part is annular as a whole and includes a sealing ring and sealing lips. The cross-section of the sealing ring is an inverted "V" shape. The sealing lips are symmetrically arranged on the outer circumferential surface of the sealing ring. The sealing ring is wrapped around the outer circumferential surface of the supporting ring so that the sealing lips on both sides are in close contact and seal with the side walls of the main shaft and the bearing seat respectively.

[0009] Dustproof lips are symmetrically arranged on the outer circumferential surface of the sealing ring, and the dustproof lips on both sides are in close contact and sealing with the side walls of the main shaft and the bearing seat respectively.

[0010] A spring sheet is embedded in the sealing ring. The spring sheet is annular as a whole and has a V-shaped cross section. The spring sheet is fixed on the inner circular surface of the sealing ring to expand the sealing ring in both directions. Under the expansion elasticity of the spring sheet, the sealing lip is always in close contact with the main shaft and the bearing seat.

[0011] An annular clamp groove is arranged on the outer circumferential surface of the sealing ring, and a clamp is installed in the clamp groove, and the clamp locks the sealing ring.

[0012] The support ring and the multi-lip sealing part are both split structures.

[0013] The inner circumferential surface of the sealing ring is symmetrically provided with snap rings, and the two side walls of the support ring are provided with annular snap grooves at corresponding positions, and the snap rings are installed in the snap grooves with interference fit.

[0014] The snap ring is located on the inner side of the sealing lip.

[0015] When the shaft is stationary and the bearing seat rotates, an oil collecting box is installed at the bottom of the main shaft, and the oil collecting box is located below the multi-lip sealing part. The bottom of the support ring is axially provided with a first oil outlet hole connecting the two sides of the support ring near the inner circular surface, and the bottom of the multi-lip sealing part is radially provided with a second oil outlet hole connecting the sealing cavity and the outside world near the side of the main shaft.

[0016] The support ring is made of metal or non-metal material.

[0017] The multi-lip sealing part is made of non-metallic elastic material.

[0018] Compared with the prior art, the double-end face axial multi-lip sealing device provided by the utility model has the following advantages: 1. In the utility model, the sealing lip is used to perform double-end face axial contact sealing on the sealing cavity, wherein the sealing lip in contact with the bearing seat is a dynamic seal, and the sealing lip in contact with the main shaft is a static seal. The double-end face sealing method can maintain symmetrical balance on both sides and extend the service life of the sealing lip; and the sealing ring is not selected in any direction when in use, and is easy to install. 2. In the utility model, a spring sheet is embedded on the inner circumferential surface of the sealing ring, and the sealing lip is always kept in a close contact state under the expansion force of the spring sheet. Even if the sealing lip is worn after long-term use, due to the expansion elasticity of the spring sheet, the sealing lip will always be in close contact with the side wall of the bearing seat and the main shaft, thereby ensuring the sealing effect. 3. In the utility model, a clamp is installed on the outer circumferential surface of the sealing ring to lock the entire sealing ring, and the sealing ring is installed firmly. 4. In the utility model, the support ring and the multi-lip sealing part are both split structures, which are easy to install and maintain. 5. In the utility model, the sealing ring and the support ring are provided with matching buckle rings and slots, so that the sealing ring and the support ring are connected as a whole. 6. In the utility model, an oil collecting box, a first oil outlet and a second oil outlet are provided. The grease leaked from the sealing cavity can flow from the first oil outlet to the second oil outlet, and finally flow into the oil collecting box for collection, so as to avoid pollution caused by leakage of waste grease. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the double-end axial multi-lip seal device provided in Example 1;

[0020] Figure 2 This is a schematic diagram of the overall structure of the double-end axial multi-lip sealing device provided in Example 2;

[0021] In the figure: 1-end cover, 2-small shaft, 3-large shaft, 4-sealing chamber, 5-support ring, 6-sealing ring, 7-sealing lip, 8-spring sheet, 9-hoop, 10-dustproof lip, 11-snapping ring, 12-oil collecting box, 13-first oil outlet, 14-second oil outlet. DETAILED DESCRIPTION

[0022] The utility model is described in detail below with reference to the accompanying drawings.

[0023] Example 1

[0024] The structure of the double-end axial multi-lip sealing device provided by the utility model is as follows Figure 1 As shown, it is installed between the shaft and the bearing seat 1, the shaft is a stepped structure, including a large shaft 3 and a small shaft 2, the end of the small shaft away from the large shaft is installed inside the bearing seat, the small shaft and the bearing seat rotate relative to each other (that is, the application scenario in which the shaft rotates and the bearing seat is stationary, or the application scenario in which the bearing seat rotates and the shaft is stationary), and the gap between the two is a sealed cavity 4.

[0025] In this embodiment, the double-end axial multi-lip sealing device comprises a support ring 5 and a multi-lip sealing portion, wherein the support ring is tightly sleeved on the small shaft and is located between the large shaft and the bearing seat.

[0026] The multi-lip seal is annular as a whole, including a sealing ring 6 and a sealing lip 7. The cross section of the sealing ring is an inverted "V" shape, and the sealing lips are symmetrically arranged on the outer circumference of the sealing ring. The sealing ring is wrapped around the outer circumference of the support ring, so that the sealing lips on both sides are in close contact and sealing with the side walls of the main shaft and the bearing seat respectively. The sealing lips on both sides are used to perform double-end axial contact sealing on the sealing cavity, wherein the sealing lip in contact with the bearing seat is a dynamic seal, and the sealing lip in contact with the main shaft is a static seal. The double-end sealing method can maintain symmetrical balance on both sides, reduce wear on the sealing lips, and extend the service life of the sealing lips; and the sealing ring is not selected in any direction when in use, and is easy to install.

[0027] In this embodiment, a spring sheet 8 is embedded in the sealing ring. The spring sheet is annular as a whole, and the cross section of the spring sheet is V-shaped. The spring sheet is fixed against the inner surface of the sealing ring, so that the sealing ring expands in both directions. Under the expansion elasticity of the spring sheet, the sealing lip is always in close contact with the main shaft and the bearing seat to ensure the sealing effect. In actual installation, the spring sheet is first installed on the sealing ring, and then the whole spring sheet is clamped and sleeved on the support ring, that is, the spring sheet is in contact with the support ring.

[0028] In this embodiment, an annular clamp groove is provided on the outer circumferential surface of the sealing ring, and a clamp 9 is installed in the clamp groove, and the sealing ring is locked by the clamp to ensure the installation stability of the entire sealing device. Preferably, the support ring and the multi-lip sealing part are both split structures, both composed of multiple arc components, which are convenient for installation and maintenance.

[0029] In this embodiment, dustproof lips 10 are symmetrically arranged on the outer circumference of the sealing ring, and the dustproof lips on both sides are in close contact and seal with the side walls of the main shaft and the bearing seat respectively to prevent external dust from entering the sealing cavity. Specifically, the sealing lip is close to the shaft, and the dustproof lip is close to the outside.

[0030] Preferably, snap rings 11 are symmetrically arranged on the inner circumferential surface of the sealing ring, and annular snap grooves are arranged at corresponding positions on the two side walls of the support ring. The snap rings are installed in the snap grooves with interference fit, so that the sealing ring and the support ring are connected as a whole. During actual installation, the sealing ring and the support ring are split structures. The sealing ring can be firstly wrapped around the support ring, the snap ring is locked, the sealing ring and the support ring are connected as a whole, and then the support ring is put on the small shaft and the clamp is locked. Furthermore, the snap ring is located on the inner side of the sealing lip, and the snap ring is pressed between the support ring and the sealing lip. When the sealing device is deflected, it can play a buffering role and reduce the wear of the sealing lip.

[0031] In this embodiment, the support ring is made of metal or non-metal material, and can also be made of non-metal material in actual settings. The multi-lip sealing part is made of non-metal elastic material.

[0032] Example 2

[0033] The structure of the double-end axial multi-lip seal device in this embodiment is basically the same as that in embodiment 1, with the only difference being that: in this embodiment, an oil collecting box 12 is installed at the bottom of the main shaft, and the oil collecting box is located below the multi-lip seal portion. A first oil outlet hole 13 connecting the two sides of the support ring is axially arranged near the inner circumferential surface at the bottom of the support ring, and a second oil outlet hole 14 connecting the sealing cavity and the outside is radially arranged on the side of the bottom of the multi-lip seal portion near the main shaft, that is, a second oil outlet hole is arranged on the sealing lip and the dustproof lip near the main shaft side, such as Figure 2 The grease leaking from the sealing cavity can flow from the first oil outlet hole to the second oil outlet hole and finally flow into the oil collecting box for collection, thus avoiding pollution caused by leakage of waste grease.

[0034] The double-end face axial multi-lip sealing device provided in this embodiment is suitable for application scenarios where the shaft is stationary and the bearing seat is rotating.

Claims

1. A double-end axial multi-lip seal device, installed between a shaft and a bearing seat, wherein the shaft is a stepped structure, including a large shaft and a small shaft, wherein one end of the small shaft away from the large shaft is installed inside the bearing seat, and the small shaft and the bearing seat rotate relative to each other and the gap between the two is a sealing cavity, characterized in that: The double-end axial multi-lip sealing device comprises: A support ring, which fits tightly on the small shaft and is located between the large shaft and the bearing seat; The multi-lip seal part is annular as a whole and includes a sealing ring and sealing lips. The cross section of the sealing ring is an inverted "V" shape. The sealing lips are symmetrically arranged on the outer circumference of the sealing ring. The sealing ring is wrapped around the outer circumference of the supporting ring so that the sealing lips on both sides are in close contact and seal with the side walls of the main shaft and the bearing seat respectively.

2. The double-end axial multi-lip seal device according to claim 1, characterized in that: Dustproof lips are symmetrically arranged on the outer circumferential surface of the sealing ring, and the dustproof lips on both sides are in close contact and sealing with the side walls of the main shaft and the bearing seat respectively.

3. The double-end axial multi-lip seal device according to claim 1, characterized in that: A spring sheet is embedded in the sealing ring. The spring sheet is annular as a whole and has a V-shaped cross section. The spring sheet is fixed on the inner circular surface of the sealing ring to expand the sealing ring in both directions. Under the expansion elasticity of the spring sheet, the sealing lip is always in close contact with the main shaft and the bearing seat.

4. The double-end axial multi-lip seal device according to claim 1, characterized in that: An annular clamp groove is arranged on the outer circumferential surface of the sealing ring, and a clamp is installed in the clamp groove, and the clamp locks the sealing ring.

5. The double-end axial multi-lip seal device according to claim 4, characterized in that: The support ring and the multi-lip sealing part are both split structures.

6. The double-end axial multi-lip seal device according to claim 1, characterized in that: The inner circumferential surface of the sealing ring is symmetrically provided with snap rings, and the two side walls of the support ring are provided with annular snap grooves at corresponding positions, and the snap rings are installed in the snap grooves with interference fit.

7. The double-end axial multi-lip seal device according to claim 6, characterized in that: The snap ring is located on the inner side of the sealing lip.

8. The double-end axial multi-lip seal device according to claim 1, characterized in that: When the shaft is stationary and the bearing seat rotates, an oil collecting box is installed at the bottom of the main shaft, and the oil collecting box is located below the multi-lip sealing part. The bottom of the support ring is axially provided with a first oil outlet hole connecting the two sides of the support ring near the inner circular surface, and the bottom of the multi-lip sealing part is radially provided with a second oil outlet hole connecting the sealing cavity and the outside world near the side of the main shaft.

9. The double-end axial multi-lip seal device according to claim 1, characterized in that: The support ring is made of metal or non-metal material.

10. The double-end axial multi-lip seal device according to claim 1, characterized in that: The multi-lip sealing part is made of non-metallic elastic material.

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