Two-stage screw air compressor

Abstract

The invention discloses a two-stage screw air compressor. The air compressor comprises a first-stage rotor assembly, a first-stage driving motor, a second-stage rotor assembly, a flow guide part and a second-stage driving motor. The first-stage rotor assembly comprises a first-stage machine body, a first-stage male rotor and a first-stage female rotor; the first-stage male rotor and the first-stage female rotor are arranged in the first-stage machine body; a first air inlet is formed in the top of the first-stage machine body; the first-stage driving motor is connected with the first-stage male rotor; the second-stage rotor assembly is arranged on the rear side of the first-stage rotor assembly and comprises a second-stage machine body, a second-stage male rotor and a second-stage female rotor. The second-stage male rotor and the second-stage female rotor are arranged in the second-stage machine body; a second air inlet is formed in the bottom of the second-stage machine body; the flow guide piece is connected with the first gas outlet and the second gas inlet and forms a gas flow channel; and the second-stage driving motor is connected with the second-stage male rotor. Through the arrangement, when the air compressor operates, the flow loss of air is lower, and the compression efficiency is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of air compressors, and in particular to a two-stage screw air compressor. Background Art

[0002] As a key gas compression device, air compressors mainly include reciprocating piston type and screw type. In the current field of air compressor technology, two-stage screw air compressors are being increasingly widely used to improve compression efficiency.

[0003] In the existing technical solutions, two-stage screw air compressors generally adopt a design in which the primary rotor group and the secondary rotor group are arranged in parallel, which is intended to reduce the compression ratio of a single rotor group, thereby reducing energy consumption and improving compression efficiency. Nevertheless, during the gas compression process of this type of screw air compressor with parallel rotor groups, there are many turns in the flow path of the gas between the rotor groups, resulting in increased flow losses and relatively low overall compression efficiency. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the present invention aims to provide a two-stage screw air compressor which can reduce the flow loss of gas between rotor groups and improve the air compression efficiency.

[0005] Based on the above purpose, the present invention adopts the following technical solution: A two-stage screw air compressor, comprising a primary rotor assembly, a primary drive motor, a secondary rotor assembly, a flow guide and a secondary drive motor; the primary rotor assembly comprises a primary body, a primary male rotor and a primary female rotor; the primary male rotor and the primary female rotor are both rotatably arranged in the primary body and mesh with each other; the primary female rotor is at least partially arranged on the left side of the primary male rotor; a first air inlet is provided at the top of the primary body, and a first air outlet is provided at the rear end of the bottom; the primary drive motor is arranged at the front side of the primary rotor assembly, connected with the primary male rotor, and used to drive the primary male rotor to rotate; the secondary rotor assembly is arranged at the rear side of the primary rotor assembly, comprising a secondary body, a secondary male rotor and a secondary female rotor; the secondary male rotor and the secondary female rotor are both rotatably arranged in the secondary body and mesh with each other; the secondary female rotor is at least partially arranged on the left side of the secondary male rotor; a second air inlet is provided at the rear side of the bottom of the secondary body, and a second air outlet is provided at the top; the flow guide is arranged at the bottom of the primary body and the secondary body to form a gas flow channel connecting the first air outlet and the second air inlet; The secondary drive motor is arranged at the rear side of the secondary rotor assembly and is connected to the secondary male rotor to drive the secondary male rotor to rotate.

[0006] Furthermore, an oil mist nozzle is provided at the rear side of the guide member, and the oil mist nozzle is connected to the external oil circuit of the secondary rotor assembly.

[0007] Furthermore, the first-stage driving motor and the first-stage male rotor are coaxially arranged in one body.

[0008] Furthermore, the secondary drive motor and the secondary male rotor are coaxially arranged in one body.

[0009] Furthermore, the primary drive motor adopts variable frequency control technology to achieve stepless speed regulation.

[0010] Furthermore, the secondary drive motor adopts variable frequency control technology to achieve stepless speed regulation.

[0011] The first-stage rotor assembly and the second-stage rotor assembly of the above-mentioned air compressor are arranged in series along the axial direction. The compressed gas enters through the first air inlet, is compressed by the first-stage male rotor and the first-stage female rotor, and is finally discharged from the first air outlet; then, the gas is guided to the second air inlet through the guide member, and is further compressed by the second-stage male rotor and the second-stage female rotor, and finally discharged from the second air outlet. This structural design effectively reduces the number of turns in the gas flow process, significantly reduces flow losses, and thus improves the gas compression efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a structural schematic diagram of a two-stage screw air compressor provided according to the present invention; Figure 2 is a left sectional view of a two-stage screw air compressor provided according to the present invention; Figure 3 It is a top cross-sectional view of a two-stage screw air compressor provided according to the present invention. DETAILED DESCRIPTION

[0013] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] At the same time, in order to clearly explain the technical solution of this application, the following is also defined: Figure 1 Shown are upper, lower, front, back, left and right sides.

[0015] like Figures 1 to 3 As shown, the present application provides a two-stage screw air compressor, which includes a primary rotor assembly 11 , a primary drive motor 12 , a secondary rotor assembly 13 , a flow guide 14 and a secondary drive motor 15 .

[0016] Specifically, the primary rotor assembly 11 includes a primary body 111, a primary male rotor 112 and a primary female rotor 113. The primary male rotor 112 and the primary female rotor 113 are both rotatably disposed in the primary body 111 and mesh with each other. The primary female rotor 113 is at least partially disposed on the left side of the primary male rotor 112. A first air inlet 114 is disposed at the top of the primary body 111, and a first air outlet 115 is disposed at the bottom rear end.

[0017] The primary driving motor 12 is installed at the front side of the primary rotor assembly 11 and connected to the primary male rotor 112 to drive the primary male rotor 112 to rotate.

[0018] The secondary rotor assembly 13 is arranged at the rear side of the primary rotor assembly 11, and includes a secondary body 131, a secondary male rotor 132 and a secondary female rotor 133. The secondary male rotor 132 and the secondary female rotor 133 are both rotatably arranged in the secondary body 131 and mesh with each other. The secondary female rotor 133 is at least partially arranged on the left side of the secondary male rotor 132. A second air inlet 134 is arranged at the rear side of the bottom of the secondary body 131, and a second air outlet 135 is arranged at the top.

[0019] The guide member 14 is installed at the bottom of the primary body 111 and the secondary body 131 to form a gas flow channel connecting the first gas outlet 115 and the second gas inlet 134 .

[0020] The secondary drive motor 15 is installed at the rear side of the secondary rotor assembly 13 and connected to the secondary male rotor 132 to drive the secondary male rotor 132 to rotate.

[0021] Through the above-mentioned arrangement, the air compressor uses a two-stage rotor assembly to compress the gas, effectively reducing the pressure ratio of each stage of the rotor assembly, reducing internal leakage, thereby improving compression efficiency and achieving energy conservation and emission reduction. During the operation of the air compressor, the compressed gas enters from the first air inlet 114, is compressed by the first-stage male rotor 112 and the first-stage female rotor 113, and is discharged from the first air outlet 115. Subsequently, the gas flows to the second air inlet 134 through the guide member 14, and is compressed by the second-stage male rotor 132 and the second-stage female rotor 133, and is discharged from the second air outlet 135. When the gas flows through the first-stage rotor assembly 11 and the second-stage rotor assembly 13, the number of turns is reduced, thereby reducing the flow loss of the gas in the air compressor and further improving the compression efficiency of the air compressor.

[0022] like Figure 2 As shown, an oil mist nozzle 141 is provided at the rear side of the guide member 14, and the oil mist nozzle 141 is connected to the external oil circuit of the secondary rotor assembly 13, so as to spray oil mist into the guide member 14 for cooling, thereby realizing approximate isothermal compression in the gas compression process, effectively reducing the power consumption of the air compressor and improving the compression efficiency.

[0023] The primary drive motor 12 and the primary male rotor 112 are coaxially integrated to achieve efficient and lossless energy transmission. Compared with the common coupling or gear transmission structure in the industry, this design has significant transmission efficiency.

[0024] Furthermore, the primary drive motor 12 and the primary male rotor 112 are integrally arranged, and can drive the primary male rotor 112 to rotate coaxially, so as to reduce the transmission loss between the primary drive motor 12 and the primary male rotor 112. At the same time, the integrated design reduces the use of the connection structure, making the overall structure of the device more compact, and reducing vibration and noise during use.

[0025] The secondary drive motor 15 and the secondary male rotor 132 are integrally arranged, and can drive the secondary male rotor 132 to rotate coaxially to reduce the transmission loss between the secondary drive motor 15 and the secondary male rotor 132 .

[0026] The two-stage rotor assemblies are integrated with their respective drive motors, making the overall layout of the air compressor more flexible and helping to optimize the overall weight distribution and space utilization.

[0027] Furthermore, the first-stage drive motor 12 adopts variable frequency control to achieve stepless speed regulation to match the optimal operating state under different pressure conditions.

[0028] The primary drive motor 12 also adopts frequency conversion control to achieve stepless speed regulation. Both the primary drive motor 12 and the secondary drive motor 15 adopt frequency conversion control technology, which can control the air intake and pressure output of the air compressor in a wide range and can be applicable to different industrial needs.

[0029] Specifically, by monitoring the operating pressure changes of the primary rotor assembly 11 and the secondary rotor assembly 13, the linkage control of the primary drive motor 12 and the secondary drive motor 15 can be achieved. By adjusting the rotation speeds of the two, it can be ensured that the air compressor always operates at the optimal efficiency point, thereby optimizing the overall performance of the air compressor compression process.

[0030] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A two-stage screw air compressor, characterized in that: include: A first-stage rotor assembly (11), the first-stage rotor assembly (11) comprising a first-stage body (111), a first-stage male rotor (112) and a first-stage female rotor (113); the first-stage male rotor (112) and the first-stage female rotor (113) are both rotatably disposed in the first-stage body (111) and mesh with each other; the first-stage female rotor (113) is at least partially disposed on the left side of the first-stage male rotor (112); a first air inlet (114) is disposed at the top of the first-stage body (111), and a first air outlet (115) is disposed at the rear end of the bottom; a primary drive motor (12), the primary drive motor (12) being arranged on the front side of the primary rotor assembly (11), connected to the primary male rotor (112), and used for driving the primary male rotor (112) to rotate; A secondary rotor assembly (13), the secondary rotor assembly (13) being arranged at the rear side of the primary rotor assembly (11), comprising a secondary body (131), a secondary male rotor (132) and a secondary female rotor (133); the secondary male rotor (132) and the secondary female rotor (133) are both rotatably arranged in the secondary body (131) and mesh with each other; the secondary female rotor (133) is at least partially arranged on the left side of the secondary male rotor (132); a second air inlet (134) is provided at the rear side of the bottom of the secondary body (131), and a second air outlet (135) is provided at the top; a flow guide (14), the flow guide (14) being arranged at the bottom of the first-stage body (111) and the second-stage body (131) to form a gas flow channel connecting the first gas outlet (115) and the second gas inlet (134); A secondary drive motor (15), the secondary drive motor (15) being arranged on the rear side of the secondary rotor assembly (13), connected to the secondary male rotor (132), and used for driving the secondary male rotor (132) to rotate.

2. The two-stage screw air compressor according to claim 1, characterized in that: An oil mist nozzle 141 is provided on the inner rear side of the flow guide (14), and the oil mist nozzle (141) is connected to the external oil circuit of the secondary rotor assembly (13).

3. The two-stage screw air compressor according to claim 1, characterized in that: The primary drive motor (12) and the primary male rotor (112) are coaxially arranged in one piece.

4. The two-stage screw air compressor according to claim 1, characterized in that: The secondary drive motor (15) and the secondary male rotor (132) are coaxially arranged in one piece.

5. The two-stage screw air compressor according to claim 1, characterized in that: The primary drive motor (12) adopts frequency conversion control technology and can achieve stepless speed regulation.

6. The two-stage screw air compressor according to claim 1, characterized in that: The secondary drive motor (15) adopts frequency conversion control technology and can achieve stepless speed regulation.

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