CN211259370U

CN211259370U - Multistage pumping high-speed bearing sealing device

Info

Publication number: CN211259370U
Application number: CN201921979100.8U
Authority: CN
Inventors: 谭旭; 杜江
Original assignee: Beijing Aerospace Yisen Wind Tunnel Engineering Technology Co ltd
Current assignee: Beijing Aerospace Yisen Wind Tunnel Engineering Technology Co ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-08-14
Anticipated expiration: 2029-11-15

Abstract

The utility model relates to a multistage pumping high speed bearing sealing device, including wearing slinger (2) and casing (1) on high-speed axle (3), slinger (2) set up the tip in casing (1), and slinger (2) are rotation type slinger, have the clearance between casing (1) and high-speed axle (3), set up thread groove (4) in the bottom of casing (1), thread groove (4) are located in the clearance, slinger (2) and casing (1) multistage series connection setting on high-speed axle (3).

Description

Multistage pumping high-speed bearing sealing device

Technical Field

The utility model belongs to the technical field of fluid machinery technique and specifically relates to a high-speed bearing sealing device of multistage pump sending.

Background

Under the working condition of high-speed rotation, the high-speed bearing has higher rotating speed and is difficult to seal, so that bearing lubricating oil is easy to leak outwards, a bearing cover plate of the high-speed shaft is easy to leak oil, and the normal use is greatly influenced.

At present, an oil seal is adopted to prevent bearing lubricating oil from leaking as a conventional sealing means, but the conventional oil seal has the defects of abrasion, breakage and the like after being used for a certain time due to temperature rise at a high rotating speed.

Disclosure of Invention

The technical problem solved by the invention is as follows: aiming at the defects of easy oil leakage and easy abrasion of the bearing in the prior art during high-speed operation, the multi-stage pumping high-speed bearing sealing device which is simple and stable in structure and can effectively avoid the external oil leakage is provided.

The technical scheme of the invention is as follows: a multistage pumping high-speed bearing sealing device comprises an oil scraper ring and a shell, wherein the oil scraper ring is connected to a high-speed shaft in a penetrating mode, the oil scraper ring is arranged at the end portion of the shell and is a rotary oil scraper ring, a gap exists between the shell and the high-speed shaft, a thread groove is formed in the bottom of the shell and is located in the gap, and the oil scraper ring and the shell are arranged on the high-speed shaft in a multistage series connection mode.

Preferably, the rotation direction of the thread groove is opposite to the rotation direction of the high-speed shaft,

preferably, the number of the thread grooves on the shell meets the requirement that at least one groove is arranged every 3 cm.

Preferably, a gap exists between the shell and the high-speed shaft, and the gap is 10-20 microns.

Preferably, the high speed shaft has a rotational speed of 2 to 3 ten thousand rpm.

Preferably, the multistage series connection is that a shell and an oil slinger arranged at the end part of the shell form a first stage, and the rest stages are arranged in the shell of the previous stage and have a gap with the shell of the previous stage; the height of the bottom of the shell of all the stages is equal to the distance between the high-speed shafts.

The series connection stage number is 2-4, and the optimal stage number is 3.

Preferably, the housing of the multi-stage tandem is flush with the end opposite to the slinger, and the flush end is in contact with the end of the bearing mounted on the high-speed shaft.

Preferably, the innermost cavity of the shell is in clearance fit with the maximum outer diameter of the bearing after the multiple stages of serial connection.

Compared with the prior art, the invention has the beneficial effects that:

casing, oil scraper ring, high-speed shaft and casing bottom helicla flute have formed simple structure, complete, compact sealing device jointly, because there is less clearance between casing and the high-speed shaft, and in casing and high-speed shaft clearance in with the opposite thread groove of high-speed shaft direction of rotation, through seting up the fluid dynamic pressure effect of thread groove make full use of, realize the effect of pump sending when the high-speed shaft is high-speed rotatory, just the utility model discloses sealing device adopts multistage series structure, and it can be applied to different operating modes. The sealing device is also provided with an oil scraper ring which is used as an auxiliary seal to prevent lubricating oil from entering the high-speed shaft bearing from the source, so that the outer oil leakage of the sealing device is avoided.

Drawings

Fig. 1 is a schematic view of a multistage pumping high speed bearing seal arrangement.

Detailed Description

The invention is further illustrated by the following examples.

In order to make the structure and function of the present invention clearer, the technical solution of the present invention is further explained below with reference to the accompanying drawings and the detailed description.

Referring to fig. 1, the utility model provides a multistage pumping high speed bearing sealing device, including the oil scraper ring 2 and the casing 1 of wearing on high-speed axle 3, oil scraper ring 2 sets up the tip at the casing, and oil scraper ring 2 is the rotation type oil scraper ring, has clearance (10-20 microns) between casing 1 and the high-speed axle 3, sets up thread groove 4 (every 3cm has at least a groove) in the bottom of casing 1, and this thread groove 4 is located in the clearance, and the rotation of thread groove 4 is opposite with high-speed axle direction of rotation, oil scraper ring 2 sets up with casing 1 multistage series connection on high-speed axle 3. The multistage series connection is that a shell and an oil deflector ring arranged at the end part of the shell form a first stage, and the other stages are all arranged in the shell of the previous stage and have a gap with the shell of the previous stage; the height of the bottom of the shell of all the stages is equal to the distance between the high-speed shafts. The series connection stage number is 2-4, and 3 stages are optimal. As shown in fig. 1, the end of the housing opposite to the oil slinger is flush after the multistage tandem connection, the flush end is contacted with one end of the bearing installed on the high-speed shaft, and the innermost cavity is in clearance fit with the maximum outer diameter of the bearing after the multistage tandem connection.

The utility model discloses sealing device simple structure, no moving part, it only adopts casing 1, oil scraper ring 2, high-speed shaft 3 and casing bottom helicla flute to form a simple structure, complete, compact sealed package jointly. The utility model discloses set up the thread groove, the fluidic dynamic pressure effect of abundant utilization realizes the effect of pump sending when the high-speed rotation of high-speed axle, just the utility model discloses sealing device adopts multistage series structure, and it can be applied to different operating modes, is particularly useful for the sealing under the 2-3 ten thousand commentaries on classics/minute rotational speed.

At present the utility model discloses sealing device has been applied to in the wuhan dynamic seal test bench project, and this sealing device has reached better sealed effect in the use of reality project.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multistage pumping high-speed bearing sealing device is characterized in that: the oil scraper ring is characterized by comprising an oil scraper ring (2) and a shell (1) which are connected to a high-speed shaft (3) in a penetrating mode, wherein the oil scraper ring (2) is arranged at the end of the shell (1), the oil scraper ring (2) is a rotary oil scraper ring, a gap exists between the shell (1) and the high-speed shaft (3), a thread groove (4) is formed in the bottom of the shell (1), the thread groove (4) is located in the gap, and the oil scraper ring (2) and the shell (1) are arranged on the high-speed shaft (3) in a multistage series mode.

2. The sealing device of claim 1, wherein: the rotation direction of the thread groove (4) is opposite to the rotation direction of the high-speed shaft (3).

3. A sealing device according to claim 1 or 2, wherein: the number of the thread grooves (4) on the shell (1) meets the requirement that at least one groove is arranged every 3 cm.

4. The sealing device of claim 1, wherein: a gap is formed between the shell (1) and the high-speed shaft, and the gap is 10-20 microns.

5. The sealing device of claim 1, wherein: the rotating speed of the high-speed shaft (3) meets 2-3 ten thousand rpm.

6. The sealing device of claim 1, wherein: the multistage series connection is characterized in that a shell and an oil retainer ring arranged at the end part of the shell form a first stage, and the rest stages are arranged in the shell of the previous stage and have a gap with the shell of the previous stage; the height of the bottom of the shell of all the stages is equal to the distance between the high-speed shafts.

7. The sealing device according to claim 1 or 6, wherein: the series connection stage number is 2-4.

8. The sealing device of claim 7, wherein: the series of stages is optimally 3 stages.

9. The sealing device according to claim 6 or 8, wherein: the end of the shell which is opposite to the oil retainer ring in position after the multistage serial connection is flush, and the flush end is contacted with one end of a bearing which is arranged on a high-speed shaft.

10. The sealing device of claim 9, wherein: the innermost cavity of the shell is in clearance fit with the maximum outer diameter of the bearing after the multiple stages of serial connection.