CN212615363U - Thrust bearing device of double-screw compressor - Google Patents

Abstract

The utility model relates to a double screw compressor's footstep bearing device for install at the rotor shaft of double screw compressor's positive rotor and negative rotor exhaust end, the device is sliding bearing device, locate the epaxial footstep bearing main part of rotor and set up in footstep bearing main part both sides and with rotor shaft run-in-step thrust dish and assist the thrust dish including the cover, the footstep bearing main part comprises bearing frame and the thrust bearing who is fixed in the bearing frame both sides respectively and radial thrust combined bearing, thrust bearing's outer terminal surface is main thrust face, and contact with the thrust dish, radial thrust combined bearing's outer terminal surface is vice thrust face, and with assist the thrust dish contact. Compared with the prior art, the utility model discloses reliable, stable, long service life has changed double screw compressor and has adopted antifriction bearing to cause the short defect of life.

Description

Thrust bearing device of double-screw compressor

Technical Field

The utility model belongs to the technical field of the twin-screw compressor technique and specifically relates to a thrust bearing device of twin-screw compressor is related to.

Background

The double-screw compressor has a series of unique characteristics of simple structure, reliable work, few easily-damaged parts, convenient operation and maintenance and the like, and is rapidly developed and widely applied to aerodynamic force, refrigeration air conditioners and various process flows in recent decades. Has wide market prospect in the industries of petroleum, chemical industry, food, medicine and the like.

The double-screw compressor structure is formed by that two rotating screws (a male rotor and a female rotor) are mutually meshed, are parallelly arranged in the interior of a compressor cylinder and are placed on bearings on the air inlet side and the air outlet side of the compressor. The dead weight of the male rotor and the female rotor of the double-screw compressor, the gas force generated in operation, the rotation inertia force and the like are all borne by the bearing, so the bearing is also the key for the reliable operation of the double-screw compressor. The bearings commonly used in the twin-screw compressor include a rolling bearing and a sliding bearing. Rolling bearings have a service life and, since all the working elements in each rolling bearing are not absolutely uniform, if one ball or roller is slightly larger than the others, it will carry most of the load and thus fail very quickly. Also, if a component is smaller than other components, it will be subjected to a smaller load, and the loads experienced by other components will increase, resulting in a reduced life span for them. In a medium-large screw compressor, a bearing bears a large load, a rolling bearing is difficult to bear, and a sliding bearing is required to be adopted. The bearing force can be decomposed into axial force and radial force, the axial force of the suction end of the double-screw compressor can be offset by the axial force of the exhaust end, so that the suction end only needs to be provided with the radial bearing to bear radial load, the exhaust end bearing does not only need to bear radial load but also needs to bear axial load, and a thrust bearing device needs to be provided to bear radial load and axial load simultaneously.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a thrust bearing device of double screw compressor reliable, stable, long service life for changing the defect that double screw compressor adopts antifriction bearing to cause life to be shorter.

The purpose of the utility model can be realized through the following technical scheme:

the utility model provides a thrust bearing device of double screw compressor for install on the rotor shaft of the positive rotor of double screw compressor and female rotor exhaust end, the device is sliding bearing device, including the thrust bearing main part of cover locating on the rotor shaft and set up in thrust bearing main part both sides and with rotor shaft synchronous operation's thrust disc and assist the thrust disc, thrust bearing main part constitute by bearing frame and thrust bearing and the combined bearing of radial thrust who is fixed in the bearing frame both sides respectively, thrust bearing's outer terminal surface be main thrust face to with the thrust disc contact, the combined bearing's of radial thrust outer terminal surface be vice thrust face to with assist the thrust disc contact.

Preferably, the combined radial thrust bearing is connected with the bearing seat through a positioning pin; a babbit alloy material layer is cast on the secondary thrust surface and bearing bush bearing surface of the radial thrust combined bearing.

Preferably, the bearing seat is fixed on the shell of the double-screw compressor through a screw hole and a bolt matched with the screw hole.

Preferably, the bearing seat is provided with an adjusting gasket for adjusting the end face gap between the rotor at the exhaust side of the double-screw compressor and the shell.

Preferably, the bearing seat is provided with an oil filling hole for filling lubricating oil.

Preferably, the thrust bearing is connected with the bearing seat through a pin, and the contact surfaces of the bearing seat and the thrust bearing are two spherical surfaces which can rotate mutually; the thrust bearing has a primary thrust surface cast with a layer of babbitt metal material.

Preferably, a plurality of oblique spiral oil grooves are arranged on the main thrust surface of the thrust bearing.

Preferably, the device further comprises an adjusting ring for adjusting the clearance between the auxiliary thrust disc and the combined radial and thrust bearing.

Preferably, the thrust disc is mounted on the rotor shaft through a flat key and is fixed through a washer and a round nut which are connected to the rotor shaft and located on the outer side of the thrust disc, so that synchronous operation with the rotor shaft is achieved.

Preferably, the auxiliary thrust disc is mounted on the rotor shaft through a pin, and synchronous operation with the rotor shaft is achieved.

Compared with the prior art, the utility model discloses a footstep bearing device is a slide bearing, and the outer terminal surface of combined bearing of radial thrust and thrust bearing is vice thrust face and main thrust face respectively, and they contact with assistance thrust dish and thrust dish for bear the axial load that the negative and positive rotor of twin-screw compressor received. The bearing bush bearing surface of the radial thrust combined bearing is contacted with the rotor journal and is used for bearing the radial load on the exhaust side of the female rotor and the male rotor of the double-screw compressor. Furthermore, the contact surfaces of the thrust bearing and the bearing seat are two spherical surfaces which can rotate mutually, so that when the rotor deforms under the action of external force, the thrust bearing device can be automatically adjusted, and the unit can keep normal operation. The bearing block is provided with screw holes for fixing the thrust bearing device on the shell of the double-screw compressor through bolts and limiting the axial movement of the female rotor and the male rotor, so that the double-screw compressor can stably operate when the female rotor and the male rotor rotate at high speed.

Drawings

Fig. 1 is a schematic view of the thrust bearing device of the present invention applied to a twin-screw compressor.

Fig. 2 is a schematic structural view of the thrust bearing device of the present invention.

FIGS. 3(a) and 3(B) are schematic front and side views of the combined angular contact bearing, respectively, and FIG. 3(c) is a schematic cross-sectional view B-B of FIG. 3 (a); FIG. 3(d) is an expanded view of the section A-A in FIG. 3 (b).

Fig. 4(a) is a schematic side view of the thrust bearing, fig. 4(B) is a schematic view of a cross section a-a in fig. 4(a), and fig. 4(c) is a schematic view of a cross section B-B in fig. 4(a) expanded.

Fig. 5(a) is a side view of the bearing seat, and fig. 5(b) is a cross-sectional view taken along a line a-a in fig. 5 (a).

In the figure, I is a thrust bearing device, II is a male rotor, III is a female rotor, 1 is an auxiliary thrust disc, 2 is a combined radial thrust bearing, 3 is a bearing seat, 4 is an adjusting shim, 5 is a pin, 6 is a thrust bearing, 7 is an adjusting ring, 8 is a thrust disc, 9 is a flat key, 10 is a washer, and 11 is a round nut.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1

A thrust bearing device of a double-screw compressor is disclosed, as shown in figure 1, the thrust bearing device I is used for being installed on a rotor shaft at the exhaust end of a male rotor II and a female rotor III of the double-screw compressor, the thrust bearing device I is a sliding bearing device, as shown in figure 2, the thrust bearing device I comprises a thrust bearing main body sleeved on the rotor shaft, a thrust disc 8 and an auxiliary thrust disc 1, the thrust bearing main body is arranged on two sides of the thrust bearing main body, the thrust disc 8 and the auxiliary thrust disc 1 are arranged on two sides of the thrust bearing main body and synchronously run with the rotor shaft, the thrust bearing main body is composed of a bearing seat 3, a thrust bearing 6 and a radial thrust combined bearing 2, the thrust bearing 6 is provided with a main thrust surface and is contacted with the thrust disc 8, and the outer.

In this embodiment, it is preferable that the auxiliary thrust disk 1 and the thrust disk 8 are made of steel material having high strength and good thermal conductivity, and are mounted on the rotor shaft through a pin and a flat key 9, respectively, so as to operate together with the shaft. In this embodiment, it is further preferable that a washer 10 and a round nut 11 are further provided on the rotor shaft outside the thrust disk 8, and cooperate with the flat key 9 to fix the thrust disk 8 to the rotor shaft.

In the present embodiment, as shown in fig. 2 and fig. 3(a) to 3(d), the combined radial and thrust bearing 2 is connected to the bearing housing 3 by a positioning pin; the radial thrust combined bearing 2 adopts high-quality low-carbon steel with high strength and good heat conductivity as a backing material, a babbitt metal material layer (adopting the babbitt metal material casting technology in the prior art) is cast on the auxiliary thrust surface and the bearing bush bearing.

In this embodiment, as shown in fig. 2 and fig. 4(a) -4 (c), preferably, the thrust bearing 6 is connected to the bearing seat 3 through a pin 5, and the contact surface between the bearing seat 3 and the thrust bearing 6 is two spherical surfaces capable of rotating with each other, so as to ensure that the thrust bearing device I can be automatically adjusted when the rotor deforms under the action of external force, so that the bearing can keep working normally. The thrust bearing 6 has a primary thrust surface (section B-B in fig. 2) that receives the axial thrust generated by the pressure difference between suction and discharge during normal operation of the compressor. Further, it is preferred that the primary thrust surface of the thrust bearing 6 be cast with a layer of babbitt metal material (for the same reasons as the combined radial thrust bearing 2). The main thrust surface of the thrust bearing 6 is provided with a plurality of oblique spiral oil grooves. The pumping action of the spiral groove is utilized to provide lubricating oil for the thrust bearing, and the groove surface and the main thrust surface form a stepped surface, so that dynamic lubrication can be formed, the thrust bearing is sufficient in oil supply, low in temperature rise and good in high-speed stability. Further, a temperature measuring hole can be arranged on the thrust bearing 6 to monitor whether the working temperature of the thrust bearing 6 is normal or not during the operation of the compressor. The device also comprises an adjusting ring 7 for adjusting the clearance between the auxiliary thrust disc 1 and the combined radial and thrust bearing 2, as shown in figure 2.

In this embodiment, as shown in fig. 2 and fig. 5(a) -5 (b), the bearing housing 3 is provided with a plurality of screw holes (see circular holes surrounded by a circle in fig. 5 (a)) for fixing the thrust bearing device I to the housing of the twin-screw compressor by bolts, and limiting the axial movement of the male and female rotors, so that the twin-screw compressor can operate stably when the male and female rotors rotate at high speed. The bearing seat 3 is provided with an adjusting gasket 4 for adjusting the end surface gap between the rotor at the exhaust side of the double-screw compressor and the shell (because the end surface gap is too large, the exhaust capacity of the compressor is affected, and if the end surface gap is too small, the end surface of the rotor body is collided with the exhaust seat). The bearing housing 3 is provided with an oil filling hole (see a vertically disposed hole in fig. 2 and 5 (b)) for injecting lubricating oil. The utility model discloses thrust bearing device I is a slide bearing, and slide bearing is called hydrodynamic bearing again, fills into suitable lubricating oil after bearing frame 3's oil filler point, and during the twin-screw compressor normal operating, can form the oil film in the thrust bearing, and the axle operation of twin-screw compressor negative, positive rotor is supported by the oil film on the oil film, therefore does not basically have mechanical wear during thrust bearing normal operating, and bearing long service life is difficult for receiving the influence of change in speed moreover.

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.

Claims (10)

1. The utility model provides a thrust bearing device of double screw compressor for install on the rotor shaft of the positive rotor (II) of double screw compressor and female rotor (III) exhaust end, its characterized in that, the device is sliding bearing device, including the thrust bearing main part of cover locating on the rotor shaft and set up thrust disc (8) and the supplementary thrust disc (1) that set up in thrust bearing main part both sides and with rotor shaft synchronous operation, thrust bearing main part constitute by bearing frame (3) and thrust bearing (6) and radial thrust combination bearing (2) of being fixed in bearing frame (3) both sides respectively, the outer terminal surface of thrust bearing (6) be main thrust face to with thrust disc (8) contact, the outer terminal surface of radial thrust combination bearing (2) be vice thrust face to with supplementary thrust disc (1) contact.

2. Thrust bearing device of a twin-screw compressor, in accordance with claim 1, characterized in that said combined radial thrust bearing (2) is connected to the bearing housing (3) by means of locating pins; a babbit alloy material layer is cast on the auxiliary thrust surface and the bearing bush bearing surface of the radial thrust combined bearing (2).

3. Thrust bearing device for a twin-screw compressor according to claim 1, characterised in that the bearing block (3) is fixed to the casing of the twin-screw compressor by means of threaded holes and bolts cooperating with the threaded holes.

4. Thrust bearing device of a twin-screw compressor, according to claim 3, characterized in that the bearing housing (3) is provided with an adjusting shim (4) for adjusting the end face clearance of the rotor and the housing on the exhaust side of the twin-screw compressor.

5. Thrust bearing device of a twin-screw compressor, in accordance with claim 1, characterized in that said bearing housing (3) is provided with oil holes for the injection of lubricating oil.

6. Thrust bearing device of a twin-screw compressor according to claim 1, characterised in that the thrust bearing (6) is connected to the bearing housing (3) by means of a pin (5), the contact surfaces of the bearing housing (3) and the thrust bearing (6) being two spherical surfaces which can rotate with respect to each other; the main thrust surface of the thrust bearing (6) is cast with a babbitt metal material layer.

7. Thrust bearing device of a twin-screw compressor according to claim 1 or 6, characterized in that the main thrust surface of the thrust bearing (6) is provided with a plurality of helical oil grooves in the form of ramps.

8. Thrust bearing device of a twin-screw compressor, according to claim 1, characterized in that it further comprises an adjusting ring (7) for adjusting the clearance between the auxiliary thrust disc (1) and the combined radial thrust bearing (2).

9. Thrust bearing device for a twin-screw compressor, in accordance with claim 1, characterized in that said thrust disc (8) is mounted on the rotor shaft by means of a flat key (9) and is fixed by means of a washer (10) and a round nut (11) connected to the rotor shaft and located outside the thrust disc (8) so as to operate synchronously with the rotor shaft.

10. Thrust bearing device for a twin-screw compressor according to claim 1, characterised in that said auxiliary thrust disc (1) is mounted on the rotor shaft by means of pins, so as to operate synchronously with the rotor shaft.

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