CN212775579U

CN212775579U - Combined oil seal with oil return function

Info

Publication number: CN212775579U
Application number: CN202020787920.3U
Authority: CN
Inventors: 刘欣; 刘丽霞
Original assignee: Wuhan Xinzhi Sealing Technology Co ltd
Current assignee: Wuhan Xinzhi Sealing Technology Co ltd
Priority date: 2020-05-13
Filing date: 2020-05-13
Publication date: 2021-03-23
Anticipated expiration: 2030-05-13

Abstract

The utility model provides a combined oil seal with oil return function, which consists of a movable ring and a static ring, wherein the movable ring comprises an inner movable ring, an outer movable ring and a movable connecting ring, and the movable ring is fixedly connected with a rotating shaft through interference fit and rotates along with the rotating shaft; the static ring comprises an inner static ring and an outer static ring which are arranged along the axial direction and a static connecting ring which is arranged along the radial direction, the static ring is also provided with a sealing end cover, and the sealing end cover comprises a positioning step, a first limiting ring and a second limiting ring; the movable ring and the static ring are inserted in a staggered manner, the inner static ring is provided with a dust lip and a sealing lip, and the top end of the sealing lip is tightly contacted with the framework on the inner movable ring; oil return grooves are formed in the bottom of the sealing gear ring on the outer static ring and below the opening on the side wall of the box body. The device can carry out better sealing to the cavity that contains lubricating grease between axis of rotation and the box, can also flow back the grease that gets into in the oil blanket to the sealed intracavity simultaneously.

Description

Combined oil seal with oil return function

Technical Field

The utility model provides a sealing device especially provides a sealing device that is arranged in the ball mill to seal the pivot and can flow back the grease that gets into in the oil blanket to sealed intracavity, 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 rotating 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 needs to achieve the purpose of preventing external pollutants from entering the sealing cavity, and in addition, the sealing device also has higher requirements on the service life of the sealing element.

In the actual work occasion in this field, because the manufacturing of box, installation are not standard, or collision, wearing and tearing in the later stage use often can lead to the surface unevenness of box, perhaps the axis of rotation is out of plumb with the box surface, and this can bring very big degree of difficulty for sealing device's installation, also can't guarantee sealing performance simultaneously. The chinese patent 2019114212183 provides a sealing device for a ball mill with an uneven box body, which can be applied to the surface of the uneven box body, but has the disadvantages of complex structure and high production and manufacturing cost. In some occasions with a flat surface of the box body, although the oil seal can be applied as well, the oil seal does not exert the full value and has the disadvantage of small and large material. Therefore, there is a need to provide a simplified version of the above-described oil seal for this situation.

Disclosure of Invention

The utility model discloses to the defect that exists among the background art, provide a combined oil blanket with oil return function, the device can carry out better sealing to the cavity that contains lubricating grease between rotation axis and the box, can also flow back the grease that gets into in the oil blanket to sealed intracavity simultaneously.

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

a combined oil seal with an oil return function is arranged between a rotating shaft and a box body, the rotating shaft is arranged in the box body and extends out of the box body, a gap between the inside of the box body and the rotating shaft is a sealing cavity, the combined oil seal with the oil return function consists of a movable ring and a static ring, the cross section of the movable ring is in an inverted C shape and comprises an inner movable ring and an outer movable ring which are arranged along the axial direction and a movable connecting ring which is arranged along the radial direction, the inner movable ring is sleeved on the rotating shaft and is in interference fit with the rotating shaft, and the movable ring is connected and fixed with the rotating shaft through interference fit and rotates along with the; a framework with the same reverse C-shaped cross section is arranged in the movable ring, wherein the framework in the inner movable ring is positioned on the outer circumference of the inner movable ring;

the section of the static ring is C-shaped, the static ring comprises an inner static ring, an outer static ring and a static connecting ring, the inner static ring and the outer static ring are arranged along the axial direction, the static connecting ring is arranged along the radial direction, the right end of the outer static ring is attached to the side wall of the box body, a sealing end cover is further arranged in the static ring, the sealing end cover is integrally annular and comprises a positioning step, a first limiting ring and a second limiting ring, the positioning step, the first limiting ring and the second limiting ring are arranged along the axial direction, the first limiting ring and the second limiting ring are fixedly connected into a whole, the positioning step is attached to the side wall of the box body and fixed with the side wall of the box body through bolts, the first limiting ring is attached to the left side wall of the static connecting;

the movable ring and the static ring are inserted in a staggered mode, the inner static ring is located between the inner movable ring and the outer movable ring, the outer movable ring is located between the inner static ring and the outer static ring, a labyrinth cavity with an S-shaped cross section is formed between the movable ring and the static ring, more than one dust lip and more than one sealing lip with splayed cross sections are arranged on the inner circular surface of the inner static ring, the top end of each dust lip and the top end of each sealing lip are in tight contact with a framework on the inner movable ring, and more than one radial sealing tooth ring are arranged on the inner circular surface and the outer circular surface of the outer movable ring, the inner circular surface of the outer static ring and the outer circular surface of the inner static ring; an oil return groove is formed in the bottom of the sealing gear ring on the outer static ring, and an oil return groove is also formed below the opening in the side wall of the box body.

A framework with a C-shaped section is fixed in the static ring.

The sealing lip is internally provided with an annular spring piece, and the spring piece expands outwards to ensure that the sealing lip on the inner static ring is kept in a close-fitting state with the framework.

Compared with the prior art, the utility model provides a combined oil blanket with oil return function has following advantage: 1. the utility model discloses a cooperation of alternating between rotating ring and the quiet ring forms the maze chamber that the cross-section is the S type jointly between rotating ring and the quiet ring, the skeleton in close contact with on the dustproof lip and the seal lip that set up on the interior quiet ring and the interior rotating ring, and the isolation of sealing ring gear is added again to realize good sealed effect. 2. The utility model discloses in at first laminate through location step and box lateral wall, location step itself has elasticity, can guarantee and the box between sealed. Secondly, the first spacing ring is attached to the left side wall of the static connecting ring and performs axial spacing for the static ring, the second spacing ring is attached to the outer circumference of the outer static ring and performs radial spacing for the static ring, and the static ring and the box body are fixed together by the three. 3. Be provided with annular spring leaf in the seal lip, the spring leaf outwards expands and makes seal lip and skeleton on the interior quiet ring keep hugging closely the state, even lead to seal lip to produce wearing and tearing through long-term the use, seal lip also can keep hugging closely with the skeleton under the expansion elasticity of spring leaf, simultaneously because the skeleton adopts wear-resisting material, consequently can life be permanent. 4. The combined oil blanket that has oil return function that this patent provided still has the oil return function, enters into the grease of maze intracavity from the seal chamber, is got rid of outside quiet ring under the centrifugal action of rotating ring, then flows to the bottom along the inner wall flow direction of outer quiet ring, and oil return groove on the last oil return groove of following seal ring and the box lateral wall of tooth department flows back to the seal chamber in at last.

Drawings

Fig. 1 is a schematic view of the overall structure of the combined oil seal with oil return function according to the present invention;

in the figure: 1-box body, 2-rotating shaft, 3-sealing cavity, 4-inner rotating ring, 5-outer rotating ring, 6-moving connecting ring, 7-framework, 8-inner static ring, 9-outer static ring, 10-static connecting ring, 11-positioning step, 12-first limiting ring, 13-second limiting ring, 14-dust-proof lip, 15-sealing lip, 16-sealing gear ring, 17-oil return groove and 18-spring piece.

Detailed Description

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

The utility model provides a combined oil blanket with oil return function's overall structure is shown in figure 1, and the device is installed between rotation axis 2 and box 1, the rotation axis is installed in the box and is stretched out from the box, and the space between the box inside and the rotation axis is sealed chamber 3, combined oil blanket with oil return function comprises rotating ring and quiet ring, the cross-section of rotating ring is anti-C style of calligraphy, including along the interior rotating ring 4 of axial setting, outer rotating ring 5 and along the dynamic link 6 of radial setting, interior rotating ring cover on the rotation axis and with rotation axis interference fit, the rotating ring is connected fixedly and is rotatory along with the rotation axis through interference fit and rotation axis; the inner part of the movable ring is provided with a framework 7 with the same reverse C-shaped section, wherein the framework in the inner movable ring is positioned on the outer circumference of the inner movable ring.

The section of the static ring is C-shaped, the static ring comprises an inner static ring 8 and an outer static ring 9 which are arranged along the axial direction and a static connecting ring 10 which is arranged along the radial direction, and a framework with the section being C-shaped is fixed in the static ring. The right-hand member of outer quiet ring pastes and leans on the box lateral wall, still be provided with end cover in the quiet ring, end cover's whole is the annular, including along the second spacing ring 13 of radial location step 11, first spacing ring 12 and along the axial setting, and three fixed connection is as an organic whole, and wherein the location step pastes and leans on the box lateral wall and fix with it through the bolt, and first spacing ring pastes and leans on the left side wall of quiet go-between and carries out axial spacing to the quiet ring, and the second spacing ring pastes and leans on the outer circumference of outer quiet ring and carries out radial spacing to the quiet ring.

The movable ring and the static ring are alternately inserted, the inner static ring is positioned between the inner movable ring and the outer movable ring, the outer movable ring is positioned between the inner static ring and the outer static ring, a labyrinth cavity with an S-shaped section is formed between the movable ring and the static ring, a dust lip 14 and a sealing lip 15 are arranged on the inner circular surface of the inner static ring, the sections of the dust lip and the sealing lip are distributed in a splayed shape, the dust lip and the sealing lip are more than one, the top end of the sealing lip is in close contact with a framework on the inner movable ring, an annular spring leaf 18 is arranged in the sealing lip, the spring leaf expands outwards to enable the sealing lip on the inner static ring to be kept in a close contact state with the framework, even if the sealing lip is worn due to long-term use, the sealing lip can be kept in close contact with the framework under the expansion elasticity of the spring leaf, and meanwhile, the framework.

More than one radial sealing tooth ring 16 is arranged on the inner circular surface and the outer circular surface of the outer rotating ring, the inner circular surface of the outer static ring and the outer circular surface of the inner static ring; an oil return groove is formed in the bottom of the sealing gear ring on the outer static ring, and an oil return groove 17 is also formed below the opening in the side wall of the box body. Grease entering the labyrinth cavity from the seal cavity is thrown to the outer stationary ring under the centrifugal action of the movable ring, then flows to the bottom along the inner wall of the outer stationary ring, and finally flows back to the seal cavity from the oil return grooves on the seal ring and the oil return grooves on the side wall of the box body.

Claims

1. The utility model provides a combined oil blanket with oil return function installs between rotation axis and box, the rotation axis is installed in the box and is stretched out from the box, and the space between the box inside and the rotation axis is sealed chamber, its characterized in that: the combined oil seal with the oil return function consists of a movable ring and a stationary ring, wherein the section of the movable ring is in an inverted C shape and comprises an inner movable ring, an outer movable ring and a movable connecting ring, the inner movable ring and the outer movable ring are arranged along the axial direction, the movable connecting ring is arranged along the radial direction, the inner movable ring is sleeved on the rotating shaft and is in interference fit with the rotating shaft, and the movable ring is fixedly connected with the rotating shaft through interference fit and rotates along with the rotating shaft; a framework with the same reverse C-shaped cross section is arranged in the movable ring, wherein the framework in the inner movable ring is positioned on the outer circumference of the inner movable ring;

2. The combination type oil seal with oil return function according to claim 1, characterized in that: a framework with a C-shaped section is fixed in the static ring.

3. The combination type oil seal with oil return function according to claim 1, characterized in that: the sealing lip is internally provided with an annular spring piece, and the spring piece expands outwards to ensure that the sealing lip on the inner static ring is kept in a close-fitting state with the framework.