CN212744327U

CN212744327U - Multistage screw air compressor

Info

Publication number: CN212744327U
Application number: CN202021291319.1U
Authority: CN
Inventors: 涂道明; 黄达平
Original assignee: Lida China Machine Equipment Co ltd
Current assignee: Lida China Machine Equipment Co ltd
Priority date: 2020-07-04
Filing date: 2020-07-04
Publication date: 2021-03-19
Anticipated expiration: 2030-07-04

Abstract

The utility model discloses a multistage screw air compressor, which comprises a shell, a compression cavity group which is composed of at least three compression cavities and is communicated with each other is arranged in the shell, the compression cavity group comprises a first-stage compression cavity, a second-stage compression cavity and a third-stage compression cavity, a first-stage compression component is arranged in the first-stage compression cavity group, a second-stage compression component is arranged in the second-stage compression cavity, a third-stage compression cavity component is arranged in the third-stage compression cavity, a rotating main shaft is arranged at the middle part in the shell, an air inlet and an air outlet are also arranged on the shell, the air inlet is communicated with the first-stage compression cavity, the air outlet is communicated with the third-stage compression cavity, an oil inlet is also arranged on the shell, the oil inlet is communicated with the first-stage compression cavity, the second-stage compression cavity and the third-stage compression cavity, the compression efficiency is improved, the, so that the lubricating oil can be recycled.

Description

Multistage screw air compressor

Technical Field

The utility model relates to an air compressor field especially relates to a multistage screw air compressor.

Background

The screw air compressor is one of the displacement compressors, the compression of the air is achieved by the volume change of the tooth spaces of the male and female rotors which are arranged in the casing and meshed with each other in parallel, the rotor pair rotates in the casing which is precisely matched with the rotor pair, so that the gas between the tooth spaces of the rotors continuously generates periodic volume change and is pushed to the discharge side from the suction side along the axis of the rotors, and the three working processes of suction, compression and discharge are completed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned not enough, provide a multistage screw air compressor.

In order to achieve the above object, the technical solution of the present invention is: the utility model provides a multistage screw air compressor, which comprises a housin, be provided with the compression chamber group that the at least three compression chamber that is linked together constitutes in this casing, this compression chamber group is including one-level compression chamber, second grade compression chamber and tertiary compression chamber, be equipped with one-level compression subassembly in this one-level compression chamber group, be equipped with second grade compression subassembly in this second grade compression chamber, be equipped with tertiary compression chamber subassembly in this tertiary compression chamber, the middle part is equipped with the rotation main shaft in this casing, this rotation main shaft can drive one-level compression subassembly, second grade compression subassembly and tertiary compression subassembly carry out continuous compression to the air, still be equipped with air inlet and gas outlet on this casing, this air inlet and one-level compression chamber intercommunication, this gas outlet and tertiary compression chamber intercommunication, still be equipped with the oil inlet on this casing, this oil inlet and one-level compression chamber.

Preferably, the first stage compression assembly comprises a first male rotor and a first female rotor in mesh, the second stage compression assembly comprises a second male rotor and a second female rotor in mesh, and the third stage compression assembly comprises a third male rotor and a third male rotor in mesh.

Preferably, the main rotating shaft is connected with the input ends of the first-stage male rotor, the second-stage male rotor and the third-stage male rotor.

Preferably, the main shaft is connected to the input of the first stage male rotor, the second stage male rotor and the third stage male rotor through a gear set.

Preferably, the first-stage male rotor, the second-stage male rotor, the third-stage male rotor, the first-stage female rotor, the second-stage female rotor and the third-stage female rotor are respectively provided with a sealing ring at two ends.

Preferably, an oil return port for oil-gas separated return oil to flow into is further formed in the shell, and the oil return port is communicated with the first-stage compression cavity, the second-stage compression cavity and the third-stage compression cavity.

Preferably, the ratio of the rotation speed of the primary male rotor, the secondary male rotor, the tertiary male rotor and the main rotating shaft is as follows: 30: 45: 36: 15.

through adopting foretell technical scheme, the beneficial effects of the utility model are that:

1. after the air enters the first-stage compression cavity through the air inlet and is compressed, the air flows through the second-stage compression cavity and the third-stage compression cavity in sequence and flows out from the air outlet, the rotating speeds of the first-stage male rotor, the second-stage male rotor and the third-stage male rotor are different, compressed air with higher pressure can be obtained after compression, and the multi-stage compression process is carried out on the same equipment, so that the compression efficiency is improved, and the production cost is reduced.

2. After the compressed gas is separated by the oil-gas separation equipment, lubricating oil can enter each compression cavity through the oil return port, so that the lubricating oil can be recycled.

Drawings

Fig. 1 is a first schematic structural diagram of an air compressor according to the present invention;

FIG. 2 is a schematic structural diagram II of the air compressor of the present invention;

FIG. 3 is a side view of the air compressor of the present invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3 according to the present invention;

FIG. 5 is a cross-sectional view of B-B of FIG. 3 according to the present invention;

fig. 6 is a cross-sectional view of C-C of fig. 3 according to the present invention.

Description of the main reference numerals: the compressor comprises a shell body 1, a first-stage compression cavity 2, a second-stage compression cavity 3, a third-stage compression cavity 4, a first-stage compression assembly 5, a first-stage male rotor 51, a first-stage female rotor 52, a second-stage compression assembly 6, a second-stage male rotor 61, a second-stage female rotor 62, a third-stage compression assembly 7, a third-stage male rotor 71, a third-stage female rotor 72, a rotating main shaft 8, an air inlet 9, an air outlet 10, an oil inlet 11 and an oil return opening 12.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

The utility model provides a multistage screw air compressor, as shown in fig. 1 and fig. 3, including a housing 1, a compression chamber group composed of at least three compression chambers communicated with each other is arranged in the housing 1, as preferred, the compression chamber group in the present embodiment includes a first-stage compression chamber 2, a second-stage compression chamber 3 and a third-stage compression chamber 4, a first-stage compression component 5 is arranged in the first-stage compression chamber 2 group, a second-stage compression component 6 is arranged in the second-stage compression chamber 3, a third-stage compression chamber 4 component is arranged in the third-stage compression chamber 4, a rotating main shaft 8 is arranged in the middle of the housing 1, the rotating main shaft 8 can drive the first-stage compression component 5, the second-stage compression component 6 and the third-stage compression component 7 to continuously compress air, further, as shown in fig. 4 and fig. 5, the rotating main shaft 8 is connected with the input ends of a first-stage male rotor 51, a, the gear set comprises a plurality of gears with different specifications, so that the first-stage male rotor 51, the second-stage male rotor 61 and the third-stage male rotor 71 have different rotating speeds, the shell 1 is further provided with an air inlet 9 and an air outlet 10, the air inlet 9 is communicated with the first-stage compression cavity 2, the air outlet 10 is communicated with the third-stage compression cavity 4, as shown in figure 2, the shell 1 is further provided with an oil inlet 11 for compressing air, the oil inlet 11 is communicated with the first-stage compression cavity 2, the second-stage compression cavity 3 and the third-stage compression cavity 4, lubricating oil can be introduced into each compression cavity through the oil inlet 11 for compressing air, as shown in figure 6, the first-stage compression assembly 5 comprises the first-stage male rotor 51 and the first-stage female rotor 52 which are meshed, as shown in figure 5, the second-stage compression assembly 6 comprises the second-stage male rotor 61 and the second-stage female rotor 62 which are meshed with each, the three-stage compression assembly 7 includes a three-stage male rotor 71 and a three-stage male rotor 71, which are engaged, and further, the first-stage male rotor 51, the second-stage male rotor 61, the third-stage male rotor 71, the first-stage female rotor 52, the second-stage female rotor 62 and the third-stage female rotor 72 are provided at both ends thereof with seal rings, and further, as shown in fig. 2, the shell 1 is also provided with an oil return port 12 for oil-gas separated return oil to flow into, compressed air is discharged along with lubricating oil and is introduced into oil-gas separation equipment, the air is separated from the lubricating oil (for those skilled in the art, how the oil-gas separation equipment separates the air into common knowledge, which is not described in detail in the embodiment), and the separated lubricating oil is introduced into each compression cavity through the oil return port 12 for recycling, the oil return port 12 is communicated with the first-stage compression cavity 2, the second-stage compression cavity 3 and the third-stage compression cavity 4.

The working principle is that air to be compressed is introduced into a first-stage compression cavity 2 through an air inlet 9, a rotating main shaft 8 is driven to rotate by a motor, the rotating speed of the motor is 1500Rpm, a first-stage male rotor 51 and a first-stage female rotor 52 are driven to rotate, the rotating speed of the first-stage male rotor 51 is 3000Rpm, the rotating speed of the first-stage female rotor 52 is 2500Rpm, the air is compressed at the first stage by matching with lubricating oil, the air pressure after the first-stage compression can reach 0.25Mpa, the compressed air after the first-stage compression is directly introduced into a second-stage compression cavity 3, the rotating main shaft 8 drives a second-stage male rotor 61 and a second-stage female rotor 62 to rotate, the rotating speed of the second-stage male rotor 61 is 4500Rpm, the rotating speed of the second-stage female rotor 62 is 3750Rpm, the air is compressed at the second stage by matching with the lubricating oil, the air pressure after the first-stage compression can reach 1.1Mpa, the rotating speed of the third-stage male rotor 71 is 3600Rpm, the rotating speed of the second-stage female rotor 62 is 2400Rpm, the air is compressed in three stages by matching with lubricating oil, the air pressure of the air after the three-stage compression can reach 4.0Mpa, the air pressure of the air after the compression of the common single-stage air compressor can not reach 4.0Mpa at all, the air enters the first-stage compression cavity 2 through the air inlet 9 to be compressed, flows through the second-stage compression cavity 3 and the third-stage compression cavity 4 in sequence and flows out from the gas outlet 10, the rotating speeds of the first-stage male rotor 51, the second-stage male rotor 61 and the third-stage male rotor 71 are different, compressed gas with higher pressure is obtained after compression, the multi-stage compression process is carried out in the same equipment, the compression efficiency is improved, meanwhile, the production cost is reduced, and after the compressed gas is separated by the oil-gas separation equipment, lubricating oil can enter each compression cavity through the oil return port 12, so that the lubricating oil can be recycled.

The above-mentioned, only preferred embodiments of the present invention are described, the scope of the present invention cannot be limited, and all the equivalent changes and decorations made according to the claims of the present invention should still fall within the scope covered by the present invention.

Claims

1. A multi-stage screw air compressor is characterized by comprising a shell, a compression cavity group consisting of at least three compression cavities communicated with each other is arranged in the shell, the compression cavity group comprises a first-stage compression cavity, a second-stage compression cavity and a third-stage compression cavity, a first-stage compression assembly is arranged in the first-stage compression cavity group, a second-stage compression component is arranged in the second-stage compression cavity, a third-stage compression cavity component is arranged in the third-stage compression cavity, the middle part in the shell is provided with a rotating main shaft which can drive the first-stage compression component, the second-stage compression component and the third-stage compression component to continuously compress air, the shell is also provided with an air inlet and an air outlet, the air inlet is communicated with the first-stage compression cavity, the air outlet is communicated with the third-stage compression cavity, the shell is also provided with an oil inlet which is communicated with the first-stage compression cavity, the second-stage compression cavity and the third-stage compression cavity.

2. The multi-stage screw air compressor of claim 1, wherein the first stage compression assembly comprises a first stage male rotor and a first stage female rotor in mesh, the second stage compression assembly comprises a second stage male rotor and a second stage female rotor in mesh, and the third stage compression assembly comprises a third stage male rotor and a third stage male rotor in mesh.

3. The multi-stage screw air compressor of claim 2, wherein the rotating main shaft is connected to the input of the first stage male rotor, the second stage male rotor, and the third stage male rotor.

4. The multi-stage screw air compressor of claim 3, wherein the rotating main shaft is connected to the input of the first stage male rotor, the second stage male rotor, and the third stage male rotor through a gear train.

5. The multistage screw air compressor according to claim 2, wherein the first-stage male rotor, the second-stage male rotor, the third-stage male rotor, the first-stage female rotor, the second-stage female rotor, and the third-stage female rotor are provided with a seal ring at both ends.

6. The multi-stage screw air compressor of claim 1, further comprising an oil return port for returning oil after oil-gas separation to the casing, wherein the oil return port is communicated with the first-stage compression chamber, the second-stage compression chamber and the third-stage compression chamber.

7. The multi-stage screw air compressor of claim 1, wherein the ratio of the rotational speed of the first stage male rotor, the second stage male rotor, the third stage male rotor and the rotating main shaft is: 30: 45: 36: 15.