Self-compensation type end face sealing mechanism

Abstract

The utility model provides a self-compensation type end face sealing mechanism which comprises two gaskets and a compensation supporting spring, and a small shaft is tightly sleeved with the two gaskets. The compensation supporting spring comprises a first supporting ring, a second supporting ring, a third supporting ring and a compensation ring, the first supporting ring, the second supporting ring and the third supporting ring are arranged in the axial direction, the section of the compensation ring is in an n shape, the first supporting ring and the second supporting ring are connected to the two outer sides of an n-shaped opening of the compensation ring respectively, and the third supporting ring is connected to the side face of the compensation ring and located on the same side with the second supporting ring. The third supporting ring, the second supporting ring and the compensation ring form an annular groove, the annular groove is filled with sealing filler, and the first supporting ring and the second supporting ring are tightly arranged on the outer circle faces of the two gaskets in a sleeving mode respectively, so that the sealing filler is tightly attached to the side wall of the rotating body. The sealing mechanism enables the sealing filler to be in contact sealing with the rotating body all the time through the rebounding force provided by the compensation supporting spring, and has the advantages of being good in sealing effect, long in service life, stable in installation and the like.

Description

TECHNICAL FIELD

[0001] The utility model provides a sealing mechanism, especially provide a self -compensating type end face sealing mechanism to the gap between fixed axle and rotator belongs to mechanical seal technical field. BACKGROUND

[0002] There is a gap between the fixed shaft and the rotating body, and a sealing mechanism is usually installed between the fixed shaft and the rotating body to seal the lubricating grease and hydraulic oil. However, due to the relative rotation of the fixed shaft and the rotating body during operation, the ordinary sealing mechanism is prone to failure, which leads to leakage of lubricating grease and hydraulic oil, pollutes the equipment working environment, and brings safety hazards to the equipment. In addition, for some special sealing scenes, it is also necessary to inject new grease regularly and discharge waste grease in limited amount. Therefore, the sealing mechanism not only needs to have a sealing effect, but also needs to leave a grease discharge channel for directional and limited discharge of waste grease. At present, there are various sealing mechanism products in this field, which have complex or simple structures, different sealing performances and different service lives. For example, patent CN210890098U discloses a bearing sealing device for a wind turbine rotor, which is composed of a connecting part and a sealing part connected as one. The connecting part is sleeved on the small shaft and has a U-shaped cross section. The sealing part is composed of a first sealing lip, a second sealing lip and a dust lip, all of which are annular. The first sealing lip, the second sealing lip and the dust lip are all inclined along the axial direction, and the right ends of the three are all in close contact with the side wall of the rotor. Patent CN212775567U discloses a bearing sealing device for a wind turbine, which improves the structure of the sealing part of the sealing device in patent CN210890098U. The cross section of the sealing part in this patent is in the shape of an inclined Z, which is composed of an inner sealing lip, an outer sealing lip and a flow guide step, all of which are circular. A spring skeleton in the shape of a ring is arranged in the sealing part and the connecting part, so that the right end of the outer sealing lip is in close contact with the side wall of the rotor under the elastic action of the spring skeleton. However, the sealing devices in the above-mentioned patents mainly use sealing lips for contact sealing, which wears out quickly and has a short service life, and needs to be replaced frequently. SUMMARY

[0003] The utility model provides a self -compensating type end face sealing mechanism, this sealing mechanism passes through the rebound provided by compensation support spring makes sealing filler always contact sealing with rotator, this sealing mechanism has good sealing effect, long service life, installation stable and so on advantage.

[0004] The technical scheme adopted by the utility model to achieve the above-mentioned purposes is as follows:

[0005] A self-compensating end face sealing mechanism is installed between a fixed shaft and a rotating body, the fixed shaft is in a stepped shaft structure, including a large shaft and a small shaft, the small shaft is installed in the interior of the rotating body, the rotating body rotates relative to the small shaft and the gap between them is a sealing cavity, the self-compensating end face sealing mechanism is in a whole circular ring shape, sealing the sealing cavity, the self-compensating end face sealing mechanism comprises:

[0006] Two gaskets are provided, both of which are tightly sleeved on the small shaft, and one of them abuts against the side wall of the large shaft, and the other abuts against the side wall of the rotating body;

[0007] The compensation support spring is in a whole annular shape, including a first support ring, a second support ring, a third support ring and a compensation ring in an n-shaped cross section, and the four are connected as an integral structure, wherein the first support ring and the second support ring are connected to the two outer sides of the n-shaped opening of the compensation ring respectively, the third support ring is connected to the side of the compensation ring and is on the same side as the second support ring, the third support ring, the second support ring and the compensation ring jointly form an annular groove, the annular groove is filled with sealing filler, the first support ring and the second support ring are tightly sleeved on the outer circular surface of the two gaskets, and the sealing filler is tightly abutted against the side wall of the rotating body.

[0008] The gasket is made of elastic material.

[0009] The first support ring is provided with a hoop on the outer circular surface, and the hoop locks the first support ring on the gasket.

[0010] There is a gap between the second support ring and the third support ring and the side wall of the rotating body, and the sealing filler protrudes from the annular groove.

[0011] The bottom of the gasket abutting against the side wall of the rotating body is provided with a first grease discharge channel communicating with the sealing cavity and the n-shaped opening of the compensation ring in the axial direction, and the bottom of the compensation ring is provided with a second grease discharge channel communicating with the n-shaped opening of the compensation ring and the outside in the radial direction, discharging waste oil in the sealing cavity.

[0012] The large shaft is provided with an oil collecting box, and the oil collecting box is located below the second grease discharge channel.

[0013] The sealing filler is oil-soaked felt or packing.

[0014] When the compensation support spring is installed between the large shaft, the small shaft and the rotating body, the compensation ring of the compensation support spring is in a compressed state.

[0015] Compared with the prior art, the self-compensation type end face sealing mechanism has the following advantages: 1, the self-compensation type end face sealing mechanism is fixedly installed on the compensation supporting spring on the small shaft, and the sealing filler is tightly attached to the side wall of the rotating body, so that the sealing cavity between the rotating body and the small shaft is sealed, and the sealing effect is good; since the compensation ring with the n-shaped cross section on the compensation supporting spring is compressed during installation, the compensation ring can always provide a rebound force for the sealing filler, so that even if the sealing filler is worn, the sealing filler can always be tightly attached to the rotating body, and the reliability of long-term sealing is ensured.

[0016] 2, the sealing filler is in contact with the rotating body, the sealing filler has good wear resistance, and the sealing mechanism has a long service life.

[0017] 3, the gasket made of elastic material is arranged between the compensation supporting spring and the small shaft in the utility model, the stability of the connection between the compensation supporting spring and the small shaft is ensured, and the compensation supporting spring is further held on the small shaft through the hoop, so that the sealing mechanism is stable and reliable in installation.

[0018] 4, the grease discharge channel and the oil collecting box are arranged in the utility model, waste oil in the sealing cavity flows into the oil collecting box through the grease discharge port, so that pollution caused by leakage of waste oil is avoided, and the structure of the compensation supporting spring is also convenient for leaving the grease discharge channel, and the structure of the sealing filler is not damaged. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The overall structure schematic view of the self-compensation type end face sealing mechanism is provided.

[0020] In the figure: 1-rotating body, 2-small shaft, 3-large shaft, 4-sealing cavity, 5-gasket, 6-first supporting ring, 7-second supporting ring, 8-third supporting ring, 9-compensation ring, 10-sealing filler, 11-hoop, 12-first grease discharge channel, 13-second grease discharge channel, 14-oil collecting box. DETAILED DESCRIPTION

[0021] The utility model will be described in detail below in combination with the drawings.

[0022] The structure of the self-compensation type end face sealing mechanism provided by the embodiment is shown in the figure, and is installed between the fixed shaft and the rotating body 1. Figure 1 The fixed shaft is in a stepped shaft structure and comprises a large shaft 3 and a small shaft 2, the small shaft is installed in the interior of the rotating body, the rotating body rotates relative to the small shaft, and the gap between the rotating body and the small shaft is a sealing cavity 4, and the self-compensation type end face sealing mechanism is in a whole circular ring shape and seals the sealing cavity.

[0023] The self-compensating end face sealing mechanism comprises two gaskets 5 and a compensating support spring, both of which are tightly sleeved on the small shaft, and one of the gaskets is in contact with the sidewall of the large shaft, and the other is in contact with the sidewall of the rotating body. Specifically, the gaskets are made of elastic material to increase the friction force and ensure the connection between the compensating support spring and the small shaft.

[0024] The compensating support spring is annular in whole and comprises a first support ring 6, a second support ring 7, a third support ring 8 and a compensating ring 9 in the shape of n, which are connected as an integral structure, wherein the first support ring and the second support ring are connected to the two outer sides of the n-shaped opening of the compensating ring respectively, the third support ring is connected to the side of the compensating ring and is on the same side as the second support ring, the third support ring, the second support ring and the compensating ring jointly form an annular groove, the annular groove is filled with sealing filler 10, and the first support ring and the second support ring are tightly sleeved on the outer circular surface of the two gaskets, so that the sealing filler is tightly in contact with the sidewall of the rotating body. Specifically, a clamp 11 is installed on the outer circular surface of the first support ring, which locks the first support ring on the gasket to ensure the installation stability of the entire compensating support spring. Further, when the compensating support spring is installed between the large shaft, the small shaft and the rotating body, the compensating ring of the compensating support spring is in a compressed state. Since the cross section of the compensating ring is in the shape of n, it can be compressed, which facilitates the installation of the entire sealing mechanism. After installation, the compensating ring in the compressed state always provides a certain elastic force to the sealing filler, so as to ensure that the sealing filler is tightly in contact with the rotating body and the sealing effect is ensured. There is a gap between the second support ring and the third support ring and the sidewall of the rotating body, the sealing filler protrudes from the annular groove, and after the sealing filler is worn, it can still be tightly in contact with the rotating body and sealed under the automatic compensation of the compensating ring. Preferably, the sealing filler is oil-soaked felt or packing.

[0025] In this embodiment, the bottom of the gasket in contact with the sidewall of the rotating body is provided with a first grease discharge channel 12 in communication with the sealing cavity and the n-shaped opening of the compensating ring in the axial direction, and the bottom of the compensating ring is provided with a second grease discharge channel 13 in communication with the n-shaped opening of the compensating ring and the outside in the radial direction, which can discharge waste oil and grease in the sealing cavity and reduce the leakage of waste oil and grease. An oil collecting box 14 is installed on the large shaft, which is located below the second grease discharge channel and collects the waste oil and grease after flowing out and is cleaned regularly.

Claims

1. A self-compensating end face seal mechanism installed between a fixed shaft and a rotating body, the fixed shaft being in a stepped shaft structure including a large shaft and a small shaft, the small shaft being installed inside the rotating body, the rotating body being rotated relative to the small shaft and a gap between the rotating body and the small shaft being a seal cavity, the self-compensating end face seal mechanism being in a whole circular ring shape to seal the seal cavity, characterized in that: The self-compensation type end face sealing mechanism comprises: ​ Two gaskets are arranged, and the two gaskets are tightly sleeved on the small shaft, and one of the gaskets is in abutment with the side wall of the large shaft, and the other gasket is in abutment with the side wall of the rotating body; The compensation supporting spring is annular in whole, comprises a first supporting ring, a second supporting ring, a third supporting ring arranged in the axial direction, and a compensation ring with an n-shaped cross section, and the four are connected as an integral structure, wherein the first supporting ring and the second supporting ring are respectively connected to the two outer sides of the n-shaped opening of the compensation ring, the third supporting ring is connected to the side surface of the compensation ring and is on the same side as the second supporting ring, the third supporting ring, the second supporting ring and the compensation ring jointly form an annular groove, the annular groove is filled with sealing filler, and the first supporting ring and the second supporting ring are tightly sleeved on the outer circular surface of the two gaskets, and the sealing filler is tightly abutted with the side wall of the rotating body.

2. The self-compensating end face seal mechanism according to claim 1, characterized in that: The gasket is made of elastic material.

3. The self-compensating end face seal mechanism of claim 1, wherein: The first supporting ring is provided with a hoop on the outer circular surface, and the hoop locks the first supporting ring on the gasket.

4. The self-compensating end face seal mechanism of claim 1, wherein: There is a gap between the second supporting ring and the third supporting ring and the side wall of the rotating body, and the sealing filler protrudes from the annular groove.

5. The self-compensating end face seal mechanism of claim 1, wherein: The bottom of the gasket abutting against the side wall of the rotating body is provided with a first grease discharge channel in communication with the sealing cavity and the n-shaped opening of the compensation ring in the axial direction, and the bottom of the compensation ring is provided with a second grease discharge channel in communication with the n-shaped opening of the compensation ring and the outside in the radial direction, and the waste oil in the sealing cavity is discharged.

6. The self-compensating end face seal mechanism according to claim 5, characterized in that: An oil collecting box is mounted on the large shaft, and the oil collecting box is located below the second grease discharge channel.

7. The self-compensating end face seal mechanism of claim 1, wherein: The sealing filler is oil-soaked felt or packing.

8. The self-compensating end face seal mechanism of claim 1, wherein: When the compensation supporting spring is mounted between the large shaft, the small shaft and the rotating body, the compensation ring of the compensation supporting spring is in a compressed state.

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