CN213393538U

CN213393538U - Oil-proof and dust-proof backflow sealing device

Info

Publication number: CN213393538U
Application number: CN202021198895.1U
Authority: CN
Inventors: 邓能华
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-06-08
Anticipated expiration: 2030-06-24

Abstract

The utility model provides a backward flow type grease proofing dust sealing device, install between main shaft and end cover, the main shaft is installed in the end cover and is stretched out from the end cover, and the space between the end cover inside and the main shaft is the sealed chamber, the grease proofing dust sealing device of backward flow type comprises first rotating ring, second rotating ring and quiet ring, and the structure of first rotating ring and second rotating ring is the same, and both cross-sections are the U style of calligraphy wholly, by along the left rotating ring of radial setting, right rotating ring and along the moving connecting ring of axial setting; the section of the static ring is in a Chinese character 'shan' shape, and the static ring at least comprises a sealing flange, a second sealing ring and a sealing gland which are connected in sequence from left to right; and an oil return hole communicated with the sealing cavity is axially formed in the bottom of the static ring. The device can carry out better sealed to the cavity that contains lubricating grease between main shaft and the box, prevents that external dust from getting into sealed intracavity, and its simple structure, life are permanent.

Description

Oil-proof and dust-proof backflow sealing device

Technical Field

The utility model provides a sealing device especially provides one kind and is arranged in main shaft or the rotation barrel to main shaft or rotate the barrel and seal dirt-proof sealing device, belongs to mechanical seal technical field.

Background

The labyrinth seal is a device which is provided with a plurality of annular seal teeth arranged in sequence around a main shaft, a series of cut-off gaps and expansion cavities are formed between the teeth, and the purpose of leakage resistance is achieved by the throttling effect generated when the sealed medium passes through the gaps of the zigzag labyrinth. The labyrinth seal has no solid contact because of the clearance between the rotor and the casing, and allows thermal expansion, so that the labyrinth seal is suitable for occasions of high temperature, high pressure and high rotating speed frequency, and is widely used for sealing shaft ends and stages of steam turbines, gas turbines, compressors and blowers.

In some occasions with strict use requirements, the sealing device not only needs to achieve zero leakage of lubricating oil in the sealing cavity, but also can achieve the purpose of preventing external pollutants such as dust from entering the inside of the sealing cavity when in use, and in addition, the sealing device also has higher requirements on the service life of the sealing element.

The sealing devices in the prior art are more in variety, complicated or simple in structure, and different in sealing performance. In general, however, it would be desirable to provide a seal assembly that is simple in construction, has good sealing properties, and has a long useful life.

Disclosure of Invention

The utility model discloses the needle provides a grease proofing dust sealing device of backward flow type, the device can carry out better sealing to the cavity that contains lubricating grease between main shaft and the end cover, prevents that external dust from getting into sealed intracavity, and its simple structure, simple to operate, easy to maintain, life are permanent.

Realize the utility model discloses the technical scheme that above-mentioned purpose adopted does:

a backflow type oil-proof and dust-proof sealing device is arranged between a main shaft and an end cover, the main shaft is arranged in the end cover and extends out of the end cover, a gap between the interior of the end cover and the main shaft is a sealing cavity, the backflow type oil-proof and dust-proof sealing device is composed of a first movable ring, a second movable ring and a static ring, the first movable ring and the second movable ring are identical in structure, the sections of the first movable ring and the second movable ring are integrally U-shaped, the backflow type oil-proof and dust-proof sealing device is composed of a left movable ring and a right movable ring which are arranged along the radial direction and a movable connecting ring which is arranged along the axial direction, and the movable connecting ring;

the section of the static ring is in a Chinese character 'shan' shape and at least comprises a sealing flange, a second sealing ring and a sealing gland which are sequentially connected from left to right, wherein the sealing flange consists of a first sealing ring arranged along the radial direction and a first static connecting ring arranged along the axial direction, the left side wall of the first sealing ring is attached to the side wall of the end cover, and the first sealing ring is fixedly connected with the end cover through a bolt; the second sealing ring is arranged along the radial direction; the sealing gland is L-shaped and consists of a third sealing ring arranged along the radial direction and a second static connecting ring arranged along the axial direction, wherein the first static connecting ring and the second static connecting ring are fixedly connected through bolts, and the outer circumference of the second sealing ring is clamped and fixed between the first static connecting ring and the second static connecting ring; the first rotating ring is positioned between the first sealing ring and the second sealing ring, the second rotating ring is positioned between the second sealing ring and the third sealing ring, the left side wall of the left rotating ring in the first rotating ring and the second rotating ring is provided with an outward-inclined sealing lip, the right side wall of the right rotating ring is also provided with an outward-inclined sealing lip, the included angle between the sealing lip and the left rotating ring or the right rotating ring is 30-60 degrees, and the sealing lips are in contact sealing with the first sealing ring, the second sealing ring or the third sealing ring;

and an oil return hole communicated with the sealing cavity is axially formed in the bottom of the static ring.

Compared with the prior art, the utility model provides a grease proofing dust sealing device of backward flow type has following advantage: 1. the utility model discloses simple structure, through the cooperation of interlude between first rotating ring, second rotating ring and the quiet ring, seal lip and first seal ring contact seal on the left rotating ring in the first rotating ring, seal lip and second seal ring contact seal on the left rotating ring of the seal lip on the right rotating ring in the first rotating ring and second rotating ring, seal lip and third seal ring contact seal on the right rotating ring in the second rotating ring to form four sealed lines of defence, both isolated external dust gets into and prevents the grease in the sealed intracavity from leaking. 2. The bottom of quiet ring is provided with the oil gallery that communicates with the seal chamber along the axial, even there is the grease of partial seal intracavity to cross partial seal defence line, this partial grease also can in time flow back to the seal chamber from the oil gallery.

Drawings

Fig. 1 is a schematic view of the overall structure of the backflow type oil-proof and dust-proof sealing device provided by the present invention;

in the figure: 1-end cover, 2-main shaft, 3-seal cavity, 4-left movable ring, 5-right movable ring, 6-movable connecting ring, 7-throat hoop, 8-first seal ring, 9-first static connecting ring, 10-second seal ring, 11-third seal ring, 12-second static connecting ring, 13-seal lip and 14-oil return hole.

Detailed Description

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

The utility model provides an grease proofing dustproof sealing device of backward flow type's overall structure is shown in figure 1, installs between main shaft 2 and end cover 1, the main shaft is installed in the end cover and is stretched out from the end cover, and the space between the inside and the main shaft of end cover is sealed chamber 3, grease proofing dustproof sealing device of backward flow type comprises first rotating ring, second rotating ring and quiet ring, and the structure of first rotating ring and second rotating ring is the same, and both cross-sections all wholly are the U style of calligraphy, by along the left rotating ring 4 of radial setting, right rotating ring 5 and along the moving connecting ring 6 of axial setting and constitute, moving connecting ring cover is fixed in on the main shaft and tightening through larynx hoop 7 on the main shaft.

The section of the static ring is in a Chinese character 'shan' shape, and the static ring at least comprises a sealing flange, a second sealing ring 10 and a sealing gland which are sequentially connected from left to right, wherein the sealing flange consists of a first sealing ring 8 arranged along the radial direction and a first static connecting ring 9 arranged along the axial direction, the left side wall of the first sealing ring is attached to the side wall of the end cover, and the first sealing ring is fixedly connected with the end cover through a bolt; the second seal ring 10 is arranged radially; the sealing gland is L-shaped and consists of a third sealing ring 11 arranged along the radial direction and a second static connecting ring 12 arranged along the axial direction, wherein the first static connecting ring and the second static connecting ring are fixedly connected through bolts, and the outer circumference of the second sealing ring is clamped and fixed between the first static connecting ring and the second static connecting ring. The first rotating ring is positioned between the first sealing ring and the second sealing ring, the second rotating ring is positioned between the second sealing ring and the third sealing ring, the left side wall of the left rotating ring in the first rotating ring and the second rotating ring is provided with a sealing lip 13 which inclines outwards, the right side wall of the right rotating ring is also provided with a sealing lip which inclines outwards, the included angle between the sealing lip and the left moving ring or the right moving ring is 30-60 degrees, the sealing lips are in contact sealing with the first sealing ring, the second sealing ring or the third sealing ring, specifically, the sealing lip on the left moving ring in the first moving ring is in contact sealing with the first sealing ring, the sealing lip on the right moving ring in the first moving ring and the sealing lip on the left moving ring in the second moving ring are in contact sealing with the second sealing ring, and the sealing lip on the right moving ring in the second moving ring is in contact sealing with the third sealing ring, thereby forming four sealing lines, not only isolating external dust from entering, but also preventing grease in the sealing cavity from leaking.

The bottom of the static ring is provided with an oil return hole 14 communicated with the sealing cavity along the axial direction, and even if grease in a part of the sealing cavity exceeds a part of sealing prevention lines, the part of grease can timely flow back to the sealing cavity from the oil return hole.

Claims

1. The utility model provides an grease proofing dust sealing device of backward flow type, installs between main shaft and end cover, the main shaft is installed in the end cover and is stretched out from the end cover, and the space between the inside and main shaft of end cover is sealed chamber, its characterized in that: the backflow type oil-proof and dust-proof sealing device is composed of a first movable ring, a second movable ring and a static ring, the first movable ring and the second movable ring are identical in structure, the sections of the first movable ring and the second movable ring are U-shaped integrally, the backflow type oil-proof and dust-proof sealing device is composed of a left movable ring and a right movable ring which are arranged along the radial direction and a movable connecting ring which is arranged along the axial direction, and the movable connecting ring is sleeved on the main shaft and is tightly fixed on the main shaft through a hose clamp;