CN218991876U - Sliding bearing with composite function for screw compressor - Google Patents

Abstract

A slide bearing for screw compressor has combined function, including the body, the one end of body has mounting flange, and the mounting flange upper slide circumferencial direction distributes there is the mounting hole, and there is the oilhole body radial direction, and oilhole department has annular oil groove along the body outside, and the body hole is inlayed and is had the babbitt bush, is equipped with the boss on the terminal surface of mounting flange's one end, the height of boss is 1.5 ~ 2.5 millimeters, and the position of boss is confirmed through calculating the terminal surface suction angle of driving rotor and driven rotor respectively, has the straight flange at the side of mounting flange. The sliding bearing structure has the functions of both sliding bearing and axial air suction port of compressor. The utility model designs the sliding bearing and the detachable axial air suction port into an integral part, thereby not only having respective functions, but also reducing the number of parts, and simultaneously eliminating the problem of air leakage existing in the existing detachable air suction port due to the high-pressure oil film existing between the rotor journal and the bearing, and having simple structure and easy processing.

Description

Sliding bearing with composite function for screw compressor

Technical Field

The utility model relates to a bearing, in particular to a sliding bearing with a composite function for a screw compressor, which can be used for supporting a rotor of the screw compressor.

Background

Currently, screw compressors include a housing in which a pair of intermeshing helical rotors are disposed in parallel, and compression of the medium is achieved by the intermeshing application of the two rotors. Rotors with teeth outside the pitch circle are commonly referred to as male rotors; the rotor having concave teeth outside the pitch circle is referred to as a female rotor. The male rotor is generally connected with a prime motor, and the female rotor is driven by the male rotor to rotate. In which the two rotors are supported in the housing by bearings on both sides, sliding bearings or rolling bearings are generally used. The rolling bearing has small loss, high efficiency and convenient maintenance, but in the screw compressor with large load, only the sliding bearing can be used due to the limitation of large load or structural size.

The screw compressor is provided with an air suction port at the suction end, an exhaust port at the exhaust end, and the middle part is used for compressing working media through the engagement of a rotor. Wherein the air suction port is divided into an axial air suction port and a radial air suction port. The axial air suction port is a fixed part at the suction end of the inner rotor of the shell, namely, the fixed part is directly cast and machined in the shell, and a part of the compressor is also detachable. The detachable air suction port is easy to replace, and is mainly improved more conveniently when the design of the air suction port is imperfect, or when the molded line of the compressor is improved, the air suction port also needs to be redesigned, and the structure of the air suction port is changed at the moment more easily. The detachable air suction port inevitably has a small amount of gas leakage problem due to a gap between the detachable air suction port and the rotor shaft neck rotating at a high speed.

Disclosure of Invention

The utility model aims to provide a sliding bearing with a composite function, which has a simple structure and is easy to process and solves the problem of leakage of working medium in an air suction port of a screw compressor.

The utility model relates to a sliding bearing with a composite function for a screw compressor, which comprises a body, wherein one end of the body is provided with a mounting flange, mounting holes are distributed in the sliding circumferential direction of the mounting flange, oil holes are arranged in the radial direction of the body, an annular oil groove is formed in the oil hole along the outer side of the body, a Babbitt metal bushing is inlaid in the inner hole of the body, a boss is arranged on the end face of one end of the mounting flange, the height of the boss is 1.5-2.5 mm, the positions of the boss are determined by respectively calculating the end face suction angles of a driving rotor and a driven rotor, and a straight edge for preventing one ends of the flanges from interfering with each other during mounting of the pair of bearings is arranged on the side edge of the mounting flange.

The height of the boss (3) is 2 mm.

The sliding bearing with composite function for screw compressor of the present utility model has one air sucking port fixing part formed in the air sucking port of the rotor, one casing with inner cavity of the rotor sucking port, no boss on the end surface of the bearing, the interval between the rotor and the meshed interval, and one casing with working medium outlet communicated to form one working medium passage. The sliding bearing structure has the functions of both sliding bearing and axial air suction port of compressor. The utility model designs the sliding bearing and the detachable axial air suction port into an integral part, thereby not only having respective functions, but also reducing the number of parts, and simultaneously eliminating the problem of air leakage existing in the existing detachable air suction port due to the high-pressure oil film existing between the rotor journal and the bearing, and having simple structure and easy processing.

Drawings

Fig. 1 is a schematic front view of an embodiment of the present utility model.

FIG. 2 is a schematic cross-sectional view A-A shown in FIG. 1.

Fig. 3 is a schematic installation view of the present utility model.

Fig. 4 is a schematic diagram of a functional implementation of the present utility model.

Detailed Description

As shown in fig. 1 to 4: the utility model relates to a sliding bearing with a composite function for a screw compressor, which comprises a body 1, wherein one end of the body 1 is provided with a mounting flange 5, mounting holes 7 are distributed in the circumferential direction of the upper sliding of the mounting flange 5, an oil hole 6 is arranged in the radial direction of the body, an annular oil groove 2 is arranged at the position of the oil hole 6 along the outer side of the body 1, a Babbitt metal lining 4 is inlaid in the inner hole of the body 1, the end face of one end of the mounting flange 5 is provided with a boss 3, the height of the boss 3 is 1.5-2.5 mm, and the height of the boss 3 is preferably 2 mm. As shown in fig. 1 and 3: the position of the boss 3 is determined by calculating the end face suction angles of the driving rotor and the driven rotor respectively, or the position of the boss 3 is determined by the rotor molded line. The mounting flange 5 has a straight edge 8 at its side edge to prevent interference between one end of the flange when a pair of bearings are mounted.

The sliding bearing with the composite function for the screw compressor is provided with an air suction port fixing part formed at an air suction port of an air suction end of a rotor 12 after being installed, a working medium inlet on a shell 9, a shell cavity of the air suction end of the rotor 12, a gap 11 between a boss-free part of the end surface of the bearing and the end surface of the rotor, a meshing gap between the rotors and a working medium outlet on the shell 9 are communicated to form a working medium channel, the air suction port fixing part formed by a boss 3 on the end surface of the bearing and the end surface of the rotor 12 are gapless, only one static and one dynamic are realized in the operation process, the bearing is in a fixed state, and the rotor 12 rotates. The lubrication oil passage 10 in the housing 9 communicates with the oil groove 2 and the oil hole 6 to form a lubrication oil supply passage. The sliding bearing structure has the functions of both sliding bearing and axial air suction port of compressor. The utility model designs the sliding bearing and the detachable axial air suction port into an integral part, thereby not only having respective functions, but also reducing the number of parts, and simultaneously eliminating the problem of air leakage existing in the existing detachable air suction port due to the high-pressure oil film existing between the rotor journal and the bearing, and having simple structure and easy processing.

Claims (2)

1. Sliding bearing with composite function for screw compressors, comprising a body (1), characterized in that: there is mounting flange (5) in one end of body (1), and mounting flange (5) upward slip circumferencial direction distributes there is mounting hole (7), and there is oilhole (6) body radial direction, and oilhole (6) department has annular oil groove (2) along body (1) outside, and the hole of body (1) is inlayed and is had pasteurization bush (4), is equipped with boss (3) on the terminal surface of the one end of mounting flange (5), the height of boss (3) is 1.5 ~ 2.5 millimeters, the position of boss (3) is confirmed through the terminal surface suction angle that calculates driving rotor and driven rotor respectively, has one straight flange (8) that prevent a pair of bearing flange one end mutual interference when installing in the side of mounting flange (5).

2. The sliding bearing with composite function for screw compressor according to claim 1, the height of the boss (3) is 2 mm.

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