CN209855860U - Self-sealing bearing device - Google Patents

Abstract

The utility model discloses a self sealss bearing arrangement, including slide bearing and bearing seal. The sliding bearing comprises a bearing seat and an annular bearing bush, wherein the outer peripheral surface of the annular bearing bush is connected with the inner peripheral surface of the bearing seat. One end of the shaft seal is connected with one end of the bearing seat; the side of the shaft seal is provided with an isolating air inlet. The utility model discloses compact structure, occupation space is little, and sealing performance is reliable.

Description

Self-sealing bearing device

Technical Field

The utility model relates to a bearing device of screw rod machine.

Background

The bearing is an important part of mechanical equipment, and the main function of the bearing is to support a mechanical rotating body, reduce the friction coefficient in the movement process of the mechanical rotating body and ensure the rotation precision of the mechanical rotating body. At present, the bearing devices of a common screw machine usually comprise a radial sliding bearing and a thrust bearing. The radial sliding bearing comprises a bearing seat and an annular bearing bush, the outer peripheral surface of the annular bearing bush is connected with the inner peripheral surface of the bearing seat, the bearing seat is provided with an oil inlet and an oil return opening, lubricating oil flowing from the oil inlet flows to the bearing bush, an oil film is formed on the contact surface of the bearing bush and the shaft neck, and then the lubricating oil flows back to the oil tank from the oil return opening. The rotor bearing of the existing screw machine and the shaft seal of the rotor are respectively and independently arranged, so that a larger space volume is occupied, the sealing performance is not ideal enough, the problem that the lubricating oil steam in the bearing leaks into a working cavity of the screw machine or the working medium steam in the working cavity of the screw machine leaks into the bearing is difficult to avoid, and therefore the working medium steam or the lubricating oil is polluted is solved, and the defect is particularly obvious for the high-temperature and high-pressure screw machine.

Disclosure of Invention

The utility model aims to solve the technical problem that a self sealss bearing device is provided, its compact structure, occupation space is little, and sealing performance is reliable.

In order to solve the technical problem, the utility model discloses the technical scheme who takes is:

the utility model provides a self-sealing bearing device, which comprises a sliding bearing, wherein the sliding bearing comprises a bearing seat and an annular bearing bush, and the outer peripheral surface of the annular bearing bush is connected with the inner peripheral surface of the bearing seat; the self-sealing bearing device is characterized by also comprising a shaft seal, wherein one end of the shaft seal is mutually connected with one end of the bearing seat; the side of the shaft seal is provided with an isolating air inlet.

After the technical scheme is adopted, the utility model discloses at least, following advantage has:

1. the sliding bearing and the shaft seal are integrated together, so that the structure is more compact, and the occupied space is small;

2. the utility model discloses set up the isolation gas air inlet in the side of bearing seal, can introduce the compressed air that pressure is greater than slide bearing oil feed pressure and working medium steam pressure of screw rod machine when being used for high temperature steam screw rod compressor/expander to can avoid lubricating oil steam in the slide bearing to reveal in the working chamber of screw rod machine or working medium steam in the screw rod machine working chamber reveals in the slide bearing, realized good sealed;

3. the utility model discloses still integrateed thrust tile, vice thrust tile and thrust collar, can not only bear radial load, can also bear axial load, improved bearing device's reliability and economic nature.

Drawings

Fig. 1 is a schematic structural view of an embodiment of a self-sealing bearing device according to the present invention.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Please refer to fig. 1. According to the utility model discloses a self sealss bearing device, including slide bearing 1 and bearing seal 2.

The sliding bearing 1 comprises a bearing seat 11 and an annular bearing bush 12, the bearing seat 11 is provided with an oil inlet 111 and an oil return port 112, and the outer circumferential surface of the annular bearing bush 12 is connected with the inner circumferential surface of the bearing seat 11. In this embodiment, the annular bearing shell 12 is a babbitt metal bearing shell, and the babbitt metal bearing shell is cast on the inner circumferential surface of the bearing seat 11 and is connected with the bearing seat 11 into a whole. In other embodiments, the annular bearing shell 12 and the bearing seat 11 may be pinned together.

One end of the shaft seal 2 is connected with one end of the bearing seat 11; the side surface of the shaft seal 2 is provided with an isolating air inlet 20. In this embodiment, one end of the shaft seal 2 and one end of the bearing housing 11 are detachably connected to each other. Preferably, one end of the shaft seal 2 and one end of the bearing housing 11 are connected to each other by a pin 91. The shaft seal 2 comprises a front seal 21 and a main seal 22, wherein the front seal 21 and the main seal 22 are connected into a whole, and the main seal 22 is close to one end of the bearing seat 11. The barrier gas inlet 20 opens at the side of the main seal 22, alternatively the barrier gas inlet 20 opens at the middle of the main seal 22. The front seal 21 shown in fig. 1 is a skeleton seal and the main seal 22 is a comb seal, but is not limited thereto.

Further, the self-sealing bearing device of this embodiment further includes a front end cap 31, and the front end cap 31 and the other end of the shaft seal 2 are detachably connected to each other. More specifically, the front end cap 31 and the front seal 21 are connected to each other by screws.

Further, the self-sealing bearing device of the present embodiment further includes a rear end cap 32, a main thrust shoe 41, a sub thrust shoe 42, and a thrust collar 5. The main thrust pad 41 is connected to the other end of the bearing housing 11, and the sub-thrust pad is fixed to a surface of the rear end cover 32 facing the bearing housing 11. The rear end cap 32 is detachably connected to the other end of the bearing housing 11, and both ends of the thrust collar 5 abut against the main thrust pad 41 and the sub thrust pad 42, respectively.

Optionally, the main thrust pad 41 and the auxiliary thrust pad 42 are both babbitt metal thrust pads, the main thrust pad 41 is cast on the other end of the bearing seat 11, and the auxiliary thrust pad 42 is cast on the side of the rear end cover 32 facing the bearing seat 11. The rear end cap 32 and the other end of the bearing housing 11 are connected to each other by a screw 92.

To facilitate an understanding of the manner of use and the advantages of the self-sealing bearing arrangement of the present embodiment, a housing 81 and rotor shaft 82 of a screw machine, which may be a screw compressor or a screw expander, are also shown in fig. 1. The self-sealing bearing device of this embodiment is mounted on the rotor shaft 82 in use, the annular bearing shell 12 is in transition fit with the journal, and the journal does not contact the annular bearing shell 12 during rotation. Thrust ring 5 is connected to rotor shaft 82 by a pin and is rotatable with rotor shaft 82.

Lubricating oil enters from an oil inlet 111 of the bearing seat 11 and supplies oil to the annular bearing bush 12, the main thrust bush 41 and the auxiliary thrust bush 42, so that an oil film is established, the oil inlet pressure is 0.3-0.8 MPa, the annular bearing bush 12 bears radial load, the main thrust bush 41 and the auxiliary thrust bush 42 bear axial load, and the lubricating oil returns to the oil tank through an oil return opening 112. In order to prevent the lubricant vapor in the sliding bearing from leaking into the working chamber of the screw machine (located on the left side of the shaft seal 2 shown in fig. 1) and the working medium vapor in the working chamber of the screw machine from leaking into the sliding bearing, the barrier air inlet 20 is supplied with compressed air having a pressure greater than the oil inlet pressure of the sliding bearing and the pressure of the working medium vapor of the screw machine. The compressed air that lets in falls into two tunnel, reveals to the working chamber of screw rod machine all the way to can prevent that the working medium steam in the screw rod machine working chamber from revealing the slide bearing, another way reveals and gets into the oil tank through oil return opening 112 in the slide bearing 1, and the mouth is breathed to the rethread oil tank and discharges, and then can prevent the lubricating oil steam in the slide bearing and reveal the working chamber of screw rod machine.

The utility model discloses be in the same place slide bearing and bearing seal integration, the structure is compacter, and occupation space is little moreover.

Claims (9)

1. A self-sealing bearing device comprises a sliding bearing, wherein the sliding bearing comprises a bearing seat and an annular bearing bush, and the outer peripheral surface of the annular bearing bush is connected with the inner peripheral surface of the bearing seat; the self-sealing bearing device is characterized by further comprising a shaft seal, wherein one end of the shaft seal is connected with one end of the bearing seat; and an isolating air inlet is formed in the side surface of the shaft seal.

2. The self-sealing bearing assembly as claimed in claim 1 wherein said shaft seal includes a forward seal and a main seal, said forward seal being integral with said main seal, said main seal being adjacent one end of said housing.

3. The self-sealing bearing assembly as claimed in claim 2 wherein the forward seal is a skeleton seal and the primary seal is a comb seal.

4. A self-sealing bearing assembly as claimed in claim 2 or claim 3, wherein the barrier air inlet opens laterally of the primary seal.

5. The self-sealing bearing assembly as claimed in claim 1 wherein the annular bearing shell is a babbitt metal bearing shell cast into an inner circumferential surface of the housing.

6. The self-sealing bearing assembly as claimed in claim 1 or claim 2 wherein an end of the shaft seal is removably interconnected with an end of the bearing housing.

7. The self-sealing bearing device as claimed in claim 1 or 2, wherein the self-sealing bearing device comprises a rear end cap, a primary thrust shoe, a secondary thrust shoe and a thrust ring;

the main thrust pad is connected with the other end of the bearing seat, and the auxiliary thrust pad is fixed on one surface of the rear end cover facing the bearing seat; the rear end cover is detachably connected with the other end of the bearing seat, and two ends of the thrust ring are respectively abutted against the main thrust tile and the auxiliary thrust tile.

8. The self-sealing bearing assembly as claimed in claim 7 wherein the rear end cap is connected to the other end of the bearing housing by a screw.

9. The self-sealing bearing device as claimed in claim 7, wherein the self-sealing bearing device includes a front end cap removably interconnected to the other end of the shaft seal.