CN223524434U - Self-compensating type end face sealing mechanism - Google Patents

Abstract

This invention provides a self-compensating end-face sealing mechanism, including washers and a compensating support spring. Two washers are provided, each tightly fitted onto a small shaft. The compensating support spring includes a first support ring, a second support ring, a third support ring arranged axially, and a compensating ring with an N-shaped cross-section. The first and second support rings are respectively connected to the two outer sides of the N-shaped opening of the compensating ring. 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 form an annular groove filled with sealing material. The first and second support rings are tightly fitted onto the outer surfaces of the two washers, ensuring the sealing material is in close contact with the side wall of the rotating body. This sealing mechanism, through the rebound force provided by the compensating support spring, ensures that the sealing material remains in contact with the rotating body, providing a good sealing effect, long service life, and stable installation.

Description

A self-compensating end-face sealing mechanism

Technical Field

This utility model provides a sealing mechanism, and more particularly a self-compensating end face sealing mechanism for sealing the gap between a fixed shaft and a rotating body, belonging to the field of mechanical sealing technology.

Background Technology

There is a gap between the fixed shaft and the rotating body, which usually requires a sealing mechanism to seal the lubricating grease and hydraulic oil. However, due to the relative rotation between the fixed shaft and the rotating body during operation, ordinary sealing mechanisms are prone to failure, leading to leakage of lubricating grease and hydraulic oil, contaminating the equipment's working environment, and posing safety hazards. Furthermore, for some special sealing scenarios, it is often necessary to periodically inject new grease and discharge a limited amount of waste grease. Therefore, the sealing mechanism must not only provide a sealing effect but also provide a grease drainage channel for the directional and limited discharge of waste grease. Currently, there are many different sealing mechanism products available in this field, with varying structures, complex or simple designs, different sealing performances, and different service lives. For example, patent CN210890098U discloses a bearing sealing device for the impeller side of a wind turbine. This device consists of a connecting part and a sealing part connected as one unit. The connecting part is fitted onto a small shaft and has a U-shaped cross-section. The sealing part consists of a first sealing lip, a second sealing lip, and a dustproof lip, all of which are annular. The first sealing lip, the second sealing lip, and the dustproof lip are all inclined along the axial direction, and their right ends abut against the side wall of the rotor, making tight contact and sealing with the rotor. Patent CN212775567U discloses a bearing sealing device for a wind turbine, which improves upon the sealing part structure of the sealing device in patent CN210890098U. In this patent, the sealing part has a slanted Z-shaped cross-section and consists of an inner sealing lip, an outer sealing lip, and a guide step, all of which are annular. An integrally annular spring skeleton is provided within the sealing part and the connecting part, so that the right end of the outer sealing lip is tightly pressed against the side wall of the rotor under the elastic action of the spring skeleton. However, the sealing devices in the aforementioned patents all rely primarily on sealing lips for contact sealing. These sealing lips wear out quickly, resulting in short service lifespans and frequent replacements.

Summary of the Invention

This invention provides a self-compensating end-face sealing mechanism. The sealing mechanism uses the rebound force provided by the compensating support spring to ensure that the sealing packing is always in contact with the rotating body for sealing. This sealing mechanism has the advantages of good sealing effect, long service life and stable installation.

The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows:

A self-compensating end-face sealing mechanism is installed between a fixed shaft and a rotating body. The fixed shaft has a stepped shaft structure, including a large shaft and a small shaft. The small shaft is installed inside the rotating body, and the rotating body rotates relative to the small shaft. The gap between the two is a sealing cavity. The self-compensating end-face sealing mechanism is generally annular and seals the sealing cavity. The self-compensating end-face sealing mechanism includes:

There are two washers, both of which are tightly fitted onto the small shaft. One washer is in contact with the side wall of the large shaft, and the other washer is in contact with the side wall of the rotating body.

The compensating support spring is ring-shaped and includes a first support ring, a second support ring, a third support ring arranged axially, and a compensating ring with an n-shaped cross-section. The four components are connected as a single unit. The first and second support rings are respectively connected to the two outer sides of the n-shaped opening of the compensating ring. 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 together form an annular groove, which is filled with sealing filler. The first and second support rings are tightly fitted onto the outer circumference of the two washers, and the sealing filler is in close contact with the side wall of the rotating body.

The gasket is made of an elastic material.

A clamp is installed on the outer circumference of the first support ring, which locks the first support ring onto the washer.

There are gaps between the second and third support rings and the side wall of the rotating body, and the sealing packing protrudes from the annular groove.

The bottom of the washer, which is in contact with the side wall of the rotating body, is provided with a first grease discharge channel along the axial direction, which connects the sealing cavity and the N-shaped opening of the compensation ring. The bottom of the compensation ring is provided with a second grease discharge channel along the radial direction, which connects the N-shaped opening of the compensation ring and the outside, so as to discharge the waste grease in the sealing cavity.

An oil collection box is installed on the main shaft, and the oil collection box is located below the second grease discharge channel.

The sealing filler is oil-impregnated felt or packing.

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.

Compared with the prior art, the self-compensating end face sealing mechanism provided by this utility model has the following advantages: 1. The self-compensating end face sealing mechanism provided by this utility model uses a compensation support spring fixedly installed on the small shaft to tightly press the sealing packing against the side wall of the rotating body, thereby sealing the sealing cavity between the rotating body and the small shaft, resulting in a good sealing effect; since the compensation ring with an n-shaped cross section on the compensation support spring is compressed during installation, it can always provide a rebound force for the sealing packing, ensuring that even if the sealing packing is worn, it can always ensure that the sealing packing is always tightly pressed against the rotating body, ensuring the reliability of long-term sealing.

2. This utility model achieves sealing by contacting the sealing packing with the rotating body. The sealing packing has good wear resistance, and the sealing mechanism has a long service life.

3. In this utility model, a washer made of elastic material is provided between the compensating support spring and the small shaft to ensure the stability of the connection between the compensating support spring and the small shaft. At the same time, the clamp further ensures that the compensating support spring is tightly held on the small shaft, and the sealing mechanism is installed stably and reliably.

4. This utility model is equipped with a grease discharge channel and an oil collection box. Waste grease in the sealed cavity flows into the oil collection box from the grease discharge port for collection, avoiding leakage of waste grease and pollution. Moreover, the structure of the compensating support spring also makes it easy to make way for the grease discharge channel without damaging the structure of the sealing packing.

Attached Figure Description

Figure 1 is a schematic diagram of the overall structure of the self-compensating end-face sealing mechanism provided by this utility model;

In the diagram: 1-Rotating body, 2-Small shaft, 3-Large shaft, 4-Sealing cavity, 5-Washer, 6-First support ring, 7-Second support ring, 8-Third support ring, 9-Compensation ring, 10-Sealing filler, 11-Clamp, 12-First grease discharge channel, 13-Second grease discharge channel, 14-Oil collection box.

Detailed Implementation

The present invention will now be described in detail with reference to the accompanying drawings.

The structure of the self-compensating end-face sealing mechanism provided in this embodiment is shown in Figure 1. It is installed between a fixed shaft and a rotating body 1. The fixed shaft has a stepped shaft structure, including a large shaft 3 and a small shaft 2. The small shaft is installed inside the rotating body. The rotating body rotates relative to the small shaft, and the gap between the two is a sealing cavity 4. The self-compensating end-face sealing mechanism is circular in shape and seals the sealing cavity.

The self-compensating end-face sealing mechanism includes washers 5 and a compensating support spring. Two washers are provided, both tightly fitted onto the small shaft. One washer is in contact with the side wall of the large shaft, and the other is in contact with the side wall of the rotating body. Specifically, the washers are made of elastic material to increase friction and ensure a tight connection between the compensating support spring (made entirely of metal) and the small shaft.

The compensating support spring is ring-shaped, comprising a first support ring 6, a second support ring 7, a third support ring 8 arranged axially, and a compensating ring 9 with an n-shaped cross-section. These four components are connected as a single unit. The first and second support rings are connected to the 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, second, and compensating rings together form an annular groove filled with sealing filler 10. The first and second support rings are tightly fitted onto the outer surfaces of two washers, ensuring the sealing filler is in close contact with the sidewall of the rotating body. Specifically, a clamp 11 is installed on the outer surface of the first support ring, locking it onto the washers to ensure the overall stability of the compensating support spring. Furthermore, 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. Because the compensating ring has an n-shaped cross-section, it can be compressed, facilitating the installation of the entire sealing mechanism. After installation, the compressed compensating ring always provides a certain elastic force to the sealing packing, thereby ensuring that the sealing packing is in close contact with the rotating body and ensuring the sealing effect. There are gaps between the second and third support rings and the side wall of the rotating body. The sealing packing protrudes from the annular groove. Even after the sealing packing is worn, it can still maintain a tight seal with the rotating body under the automatic compensation of the compensating ring. Preferably, the sealing packing is oil-impregnated felt or packing.

In this embodiment, the bottom of the washer that abuts against the side wall of the rotating body has a first grease discharge channel 12 axially connected to the sealing cavity and the N-shaped opening of the compensation ring. The bottom of the compensation ring has a second grease discharge channel 13 radially connected to the N-shaped opening of the compensation ring and the outside, discharging waste grease from the sealing cavity and reducing waste grease leakage. An oil collection box 14 is installed on the main shaft, located below the second grease discharge channel. Waste grease is collected in the oil collection box after flowing out and is cleaned periodically.

Claims (8)

1. The utility model provides a self-compensating type end face sealing mechanism installs between fixed axle and rotator, the fixed axle is the step shaft structure, including big axle and little axle, little axle installs in the inside of rotator, and the relative little axle of rotator is rotatory and clearance between the two is sealed chamber, and self-compensating type end face sealing mechanism wholly is the ring shape, seals sealed chamber, its characterized in that self-compensating type end face sealing mechanism includes:

the two washers are arranged, the two washers are tightly sleeved on the small shaft, one washer is abutted against the side wall of the large shaft, and the other washer is abutted against the side wall of the rotating body;

the compensation support spring is annular in whole, comprises a first support ring, a second support ring, a third support ring and a compensation ring, wherein the first support ring, the second support ring, the third support ring and the compensation ring are arranged along the axial direction, the section of the compensation ring is n-shaped, the first support ring and the second support ring are connected to two outer sides of an n-shaped opening of the compensation ring respectively, the third support ring is connected to the side face of the compensation ring and is located on the same side with the second support ring, an annular groove is formed among the third support ring, the second support ring and the compensation ring, sealing filler is filled in the annular groove, the first support ring and the second support ring are respectively tightly sleeved on the outer circular faces of the two gaskets, and the sealing filler is tightly attached to the side wall of the rotating body.

2. The self-compensating end face seal mechanism of claim 1, wherein said gasket is made of an elastomeric material.

3. The self-compensating end face sealing mechanism of claim 1, wherein the outer circumferential surface of the first support ring is provided with a hoop which locks the first support ring on the gasket.

4. The self-compensating end face seal mechanism of claim 1, wherein gaps exist between the second and third support rings and the side wall of the rotating body, and the sealing filler protrudes out of the annular groove.

5. The self-compensating end face sealing mechanism of claim 1, wherein a first grease discharging channel which is communicated with the sealing cavity and the n-shaped opening of the compensating ring is arranged at the bottom of the gasket which is abutted against the side wall of the rotating body along the axial direction, a second grease discharging channel which is communicated with the n-shaped opening of the compensating ring and the outside is arranged at the bottom of the compensating ring along the radial direction, and waste grease in the sealing cavity is discharged.

6. The self-compensating end face seal mechanism of claim 5 wherein said large shaft has an oil collection box mounted thereon, said oil collection box being positioned below said second grease removal channel.

7. The self-compensating end face seal mechanism of claim 1, wherein said packing is a felt or packing.

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