Two-stage tandem screw air compressor

Abstract

The utility model discloses a two-stage tandem type screw air compressor which comprises a first-stage compression assembly, a second-stage compression assembly and a flow guide piece. The first-stage compression assembly comprises a first-stage machine body and a first-stage rotor assembly arranged in the first-stage machine body. A first air inlet is formed in the top of the first-stage machine body; the second-stage compression assembly is arranged on the rear side of the first-stage compression assembly and comprises a second-stage machine body and a second-stage rotor assembly arranged in the second-stage machine body; a second air inlet is formed in the rear side of the bottom of the second-stage machine body; and the flow guide piece is arranged at the bottoms of the primary machine body and the secondary machine body to form a gas flow channel for connecting the first gas outlet and the second gas inlet. Through the arrangement, when gas flows in the first-stage compression assembly and the second-stage compression assembly, the turning frequency is smaller, the flowing loss is lower, and the compression efficiency is higher.

Description

Technical Field

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

[0002] Air compressors, a key gas compression device, are primarily classified into two types: reciprocating piston and screw. In today's air compressor technology, two-stage screw compressors are increasingly being used to improve compression efficiency.

[0003] In existing technologies, two-stage screw compressors generally employ a design where the primary and secondary rotor groups are arranged in parallel. This design aims to reduce the compression ratio of a single rotor group, thereby reducing energy consumption and improving compression efficiency. However, during the gas compression process, the gas flow path between the rotor groups in this type of screw compressor with parallel rotor groups has many bends, resulting in increased flow losses and relatively low overall compression efficiency. Utility Model Content

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

[0005] Based on the above purpose, the present invention adopts the following technical solutions:

[0006] A two-stage tandem screw air compressor comprises: a first-stage compression assembly, a second-stage compression assembly and a flow guide; the first-stage compression assembly comprises a first-stage body and a first-stage rotor assembly arranged in the first-stage body; a first air inlet is provided at the top of the first-stage body, and a first air outlet is provided at the rear end of the bottom; the second-stage compression assembly is arranged at the rear side of the first-stage compression assembly, and comprises a second-stage body and a second-stage rotor assembly arranged in the second-stage body; a second air inlet is provided at the rear side of the bottom of the second-stage body, and a second air outlet is provided at the top; the flow guide is arranged at the bottom of the first-stage body and the second-stage body, forming a gas flow channel connecting the first air outlet and the second air inlet.

[0007] Furthermore, the first-stage rotor assembly includes a first-stage male rotor and a first-stage female rotor; the first-stage male rotor and the first-stage female rotor are both rotatably disposed in the first-stage body and mesh with each other; the first-stage female rotor is at least partially disposed on the left side of the first-stage male rotor; the second-stage rotor assembly includes a second-stage male rotor and a second-stage female rotor; the second-stage male rotor and the second-stage female rotor are both rotatably disposed in the second-stage body and mesh with each other; the second-stage female rotor is at least partially disposed on the left side of the second-stage male rotor.

[0008] Furthermore, the air compressor also includes: a first-stage drive motor and a second-stage drive motor. The first-stage drive motor is installed on the front side of the first-stage compression assembly, connected to the first-stage positive rotor, and used to drive the first-stage positive rotor to rotate; the second-stage drive motor is installed on the rear side of the second-stage compression assembly, connected to the second-stage positive rotor, and used to drive the second-stage positive rotor to rotate.

[0009] Furthermore, the first-stage drive motor and the first-stage male rotor are coaxially integrated.

[0010] Furthermore, the secondary drive motor and the secondary male rotor are coaxially integrated.

[0011] Furthermore, the first-stage drive motor adopts variable frequency control technology to achieve stepless speed regulation.

[0012] Furthermore, the secondary drive motor adopts variable frequency control technology to achieve stepless speed regulation.

[0013] Furthermore, an oil mist nozzle is provided on the rear side of the interior of the guide member, and the oil mist nozzle is connected to the external oil circuit of the secondary compression assembly.

[0014] The first and second compression assemblies of the above-mentioned air compressor are arranged in series along the axial direction. Compressed gas enters through the first air inlet, is compressed by the first rotor assembly, and is ultimately discharged through the first air outlet. The gas is then guided to the second air inlet by a flow guide, where it is further compressed by the second rotor assembly before being discharged through the second air outlet. This structural design effectively reduces the number of turns in the gas flow, significantly reducing flow losses and thus improving gas compression efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of a two-stage tandem screw air compressor provided by the utility model;

[0016] Figure 2 This is a left-side sectional view of a two-stage tandem screw air compressor provided by the utility model;

[0017] Figure 3 It is an upper cross-sectional view of a two-stage tandem screw air compressor provided by the utility model. DETAILED DESCRIPTION

[0018] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0019] At the same time, in order to clearly illustrate the technical solution of this application, the following are also defined: Figure 1 Upper, lower, front, back, left and right sides shown.

[0020] like Figures 1 to 3 As shown, the present application provides a two-stage tandem screw air compressor, which includes a first-stage compression assembly 11 , a first-stage drive motor 12 , a second-stage compression assembly 13 , a flow guide 14 , and a second-stage drive motor 15 .

[0021] Specifically, the first-stage compression assembly 11 includes a first-stage body 111 and a first-stage rotor assembly disposed within the first-stage body 111. The first-stage rotor assembly includes a first-stage male rotor 112 and a first-stage female rotor 113. Both the first-stage male rotor 112 and the first-stage female rotor 113 are rotatably disposed within the first-stage body 111 and mesh with each other. The first-stage female rotor 113 is at least partially disposed to the left of the first-stage male rotor 112. A first air inlet 114 is provided at the top of the first-stage body 111, and a first air outlet 115 is provided at the bottom rear end.

[0022] The first-stage driving motor 12 is installed at the front side of the first-stage compression assembly 11 and is connected to the first-stage male rotor 112 to drive the first-stage male rotor 112 to rotate.

[0023] The secondary compression assembly 13 is mounted to the rear of the primary compression assembly 11 and includes a secondary housing 131 and a secondary rotor assembly disposed within the secondary housing. The secondary rotor assembly includes a secondary male rotor 132 and a secondary female rotor 133. Both the secondary male rotor 132 and the secondary female rotor 133 are rotatably disposed within the secondary housing 131 and mesh with each other. The secondary female rotor 133 is at least partially disposed to the left of the secondary male rotor 132. A second air inlet 134 is provided at the rear bottom of the secondary housing 131, and a second air outlet 135 is provided at the top.

[0024] The flow guide 14 is installed 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 .

[0025] The secondary drive motor 15 is installed at the rear side of the secondary compression assembly 13 and is connected to the secondary male rotor 132 to drive the secondary male rotor 132 to rotate.

[0026] Through the above-mentioned arrangement, the air compressor uses a two-stage compression assembly to compress the gas, effectively reducing the pressure ratio of each stage of the compression 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 through the guide member 14 to the second air inlet 134, 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 compression assembly 11 and the second-stage compression 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.

[0027] like Figure 2 As shown, an oil mist nozzle 141 is provided on the rear side of the guide member 14. The oil mist nozzle 141 is connected to the external oil circuit of the secondary compression assembly 13. The oil mist can be sprayed into the guide member 14 to cool it down, thereby achieving approximate isothermal compression in the gas compression process, effectively reducing the power consumption of the air compressor and improving the compression efficiency.

[0028] The first-stage drive motor 12 and the first-stage male rotor 112 are coaxially integrated, achieving efficient and lossless energy transmission. Compared with the common coupling or gear transmission structure in the industry, this design has significant transmission efficiency.

[0029] Furthermore, the primary drive motor 12 and the primary male rotor 112 are integrally arranged, driving the primary male rotor 112 to rotate coaxially, thereby reducing transmission losses between the primary drive motor 12 and the primary male rotor 112. At the same time, the integrated design reduces the use of connecting structures, making the overall structure of the device more compact and reducing vibration and noise during use.

[0030] The secondary drive motor 15 and the secondary male rotor 132 are integrally arranged to drive the secondary male rotor 132 to rotate coaxially, thereby reducing transmission loss between the secondary drive motor 15 and the secondary male rotor 132 .

[0031] The two-stage compression components 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.

[0032] 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.

[0033] The first-stage drive motor 12 also adopts variable frequency control to achieve stepless speed regulation. Both the first-stage drive motor 12 and the second-stage drive motor 15 adopt variable frequency control technology, which can control the air intake and pressure output of the air compressor in a wide range and can be applied to different industrial needs.

[0034] Specifically, by monitoring the operating pressure changes of the first-stage compression assembly 11 and the second-stage compression assembly 13, the first-stage drive motor 12 and the second-stage drive motor 15 can be controlled in a coordinated manner. By adjusting the speed of both, the air compressor can always operate at the optimal efficiency point, thereby optimizing the overall performance of the air compressor compression process.

[0035] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professional and technical personnel in the field can implement or use the present invention. Various modifications to these embodiments will be obvious to professional and technical personnel in the field. The general principles defined in this article 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 the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A two-stage tandem screw air compressor, characterized in that: include: A first-stage compression assembly (11), the first-stage compression assembly (11) comprising a first-stage body (111) and a first-stage rotor assembly disposed within the first-stage body (111); the first-stage body (111) is provided with a first air inlet (114) at the top and a first air outlet (115) at the rear end of the bottom; A secondary compression assembly (13), the secondary compression assembly (13) being arranged at the rear side of the primary compression assembly (11), comprising a secondary body (131) and a secondary rotor assembly arranged in the secondary body (131); a second air inlet (134) being provided at the rear side of the bottom of the secondary body (131), and a second air outlet (135) being provided at the top; A flow guide (14) is installed at the bottom of the first-stage body (111) and the second-stage body (131), forming a gas flow channel connecting the first gas outlet (115) and the second gas inlet (134).

2. The two-stage tandem screw air compressor according to claim 1, characterized in that: The first-stage rotor assembly comprises 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 within 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); The secondary rotor assembly comprises 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 meshed with each other; the secondary female rotor (133) is at least partially arranged on the left side of the secondary male rotor (132).

3. The two-stage tandem screw air compressor according to claim 2, characterized in that: The air compressor also includes: a first-stage drive motor (12), the first-stage drive motor (12) being mounted on the front side of the first-stage compression assembly (11), connected to the first-stage male rotor (112), and used for driving the first-stage male rotor (112) to rotate; A secondary drive motor (15) is installed at the rear side of the secondary compression assembly (13), connected to the secondary male rotor (132), and used to drive the secondary male rotor (132) to rotate.

4. The two-stage tandem screw air compressor according to claim 3, characterized in that: The first-stage drive motor (12) and the first-stage male rotor (112) are coaxially arranged as a whole.

5. The two-stage tandem screw air compressor according to claim 3, characterized in that: The secondary drive motor (15) and the secondary male rotor (132) are coaxially arranged as a whole.

6. The two-stage tandem screw air compressor according to claim 3, characterized in that: The first-stage drive motor (12) adopts variable frequency control technology and can achieve stepless speed regulation.

7. The two-stage tandem screw air compressor according to claim 3, characterized in that: The secondary drive motor (15) adopts variable frequency control technology and can achieve stepless speed regulation.

8. The two-stage tandem 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 compression assembly (13).

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