Two-stage screw air compressor with efficient heat dissipation function

Abstract

The invention discloses a two-stage screw air compressor with an efficient heat dissipation function. The air compressor comprises a first-stage rotor assembly, a second-stage rotor assembly, a flow guide part and an oil way module. The first-stage rotor assembly comprises a first-stage machine body, a first-stage male rotor and a first-stage female rotor; a first air inlet is formed in the top of the first-stage machine body; the first-stage male rotor and the first-stage female rotor are rotationally arranged in the first-stage machine body; the second-stage rotor assembly is arranged at the rear end of the first-stage rotor assembly and comprises a second-stage machine body, a second-stage male rotor and a second-stage female rotor; a second air inlet is formed in the rear end of the bottom of the second-stage machine body; the second-stage male rotor and the second-stage female rotor are rotationally arranged in the second-stage machine body; the flow guide piece is arranged at the bottoms of the first-stage machine body and the second-stage machine body to form a gas flow channel connected with the first gas outlet and the second gas inlet; the oil way module communicates with bearings at the two ends of the rotors and inner cavities of the flow guide parts. Through the arrangement, the air compressor is better in heat dissipation performance and higher in compression efficiency.

Description

Technical Field

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

[0002] Two-stage screw air compressors are widely used in gas compression scenarios in industrial production. They can significantly improve compression efficiency and reduce energy consumption through staged compression. The working principle of a conventional two-stage screw air compressor is to first compress the gas through the first-stage compression component, and then enter the second-stage compression component through the air flow channel for further compression. However, the high temperature generated in this process is one of the key issues affecting the performance and life of the equipment.

[0003] At present, two-stage screw air compressors generally cool the bearings of the male and female rotors in the first-stage compression assembly and the second-stage compression assembly to avoid bearing lubricant failure or shortened bearing life due to high temperature. However, this cooling method ignores the cooling of the gas flow path between the first-stage compression assembly and the second-stage compression assembly, which reduces the gas compression efficiency and may also increase the heat loss of the equipment, reducing the reliability and service life of the system. At the same time, the non-isothermal transfer of the gas to be compressed will also increase the burden on the second-stage compression assembly, further affecting the compression performance. In addition, the existing twin-screw air compressor adopts a radial parallel arrangement of the first-stage compression assembly and the second-stage compression assembly. When the gas flows in the air compressor, it turns more times, which also affects the cooling effect and compression efficiency. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, an object of the present invention is to provide a two-stage screw air compressor with efficient heat dissipation.

[0005] Based on the above purpose, the present invention adopts the following technical solution: A two-stage screw air compressor with high efficiency in heat dissipation comprises: a primary rotor assembly, a secondary rotor assembly, a flow guide and an oil circuit module; the primary rotor assembly comprises a primary body, a primary male rotor and a primary female rotor; a first air inlet is arranged at the top of the primary body, and a first air outlet is arranged at the bottom rear end; the primary male rotor and the primary female rotor are both rotatably arranged in the primary body through bearings, and mesh with each other; the secondary rotor assembly is arranged at the rear end of the primary rotor assembly, and comprises a secondary body, a secondary male rotor and a secondary female rotor; a second air inlet is arranged at the bottom rear end of the secondary body, and a second air outlet is arranged at the top; the secondary male rotor and the secondary female rotor are both rotatably arranged in the secondary body through bearings The first and second cooling channels are arranged in the first and second bodies and mesh with each other; the guide member is arranged at the bottom of the first and second bodies to form a gas flow channel connecting the first air outlet and the second air inlet; the oil circuit module includes an oil circuit inlet, a first cooling channel, a second cooling channel and a third cooling channel; the oil circuit inlet is at least partially arranged at the bottom of the first body; the first cooling channel is connected to the oil circuit inlet and is respectively connected to the bearings at the front and rear ends of the first male rotor and the first female rotor; the second cooling channel is connected to the oil circuit inlet and is respectively connected to the bearings at the front and rear ends of the second male rotor and the second female rotor; the third cooling channel is connected to the oil circuit inlet and is connected to the inside of the guide member, so as to exchange and dissipate heat for the air flow channel.

[0006] Furthermore, the air compressor also includes a first-stage drive motor; the first-stage drive motor is installed on the front side of the first-stage rotor assembly, connected to the first-stage male rotor, and is used to drive the first-stage male rotor to rotate.

[0007] Furthermore, the primary drive motor and the primary positive rotor are integrally arranged to drive the primary positive rotor to rotate coaxially.

[0008] Furthermore, the air compressor also includes a secondary drive motor; the secondary drive motor is installed on the front side of the secondary rotor assembly, connected to the secondary male rotor, and is used to drive the secondary male rotor to rotate.

[0009] Furthermore, the secondary drive motor and the secondary positive rotor are integrally arranged to drive the secondary positive rotor to rotate coaxially.

[0010] Furthermore, a nozzle is provided at one end of the third cooling channel connected to the interior of the flow guide member, and oil mist can be sprayed into the interior of the flow guide member through the nozzle.

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

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

[0013] The above-mentioned air compressor adopts the hierarchical design of the first-stage rotor assembly and the second-stage rotor assembly, and the gas is compressed in stages in the air compressor, which reduces the temperature rise and energy consumption during single-stage compression. At the same time, the first-stage body and the second-stage body are axially connected and connected through a guide piece, which reduces the number of turns of the gas in the air compressor, reduces flow losses, and improves compression efficiency. In addition, through the setting of the oil circuit module, sufficient lubrication and cooling of each rotor and bearing position are ensured. In particular, the heat dissipation of the guide piece is increased, so that the compression process is approximately isothermal compression, reducing power consumption and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a structural schematic diagram of a screw air compressor provided according to the present invention; Figure 2 is a top cross-sectional view of a screw air compressor provided according to the present invention; Figure 3 is a left sectional view of a screw air compressor provided according to the present invention; Figure 4 It is a right side view of the screw air compressor provided according to the present invention. DETAILED DESCRIPTION

[0015] 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.

[0016] 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.

[0017] like Figures 1 to 4 As shown, the present application provides a two-stage screw air compressor with high efficiency heat dissipation, including: a first-stage rotor assembly 11, a second-stage rotor assembly 12, a flow guide 13 and an oil circuit module 14.

[0018] Specifically, the primary rotor assembly 11 includes a primary body 111, a primary male rotor 112 and a primary female rotor 113. A first air inlet 114 is provided at the top of the primary body 111, and a first air outlet 115 is provided at the bottom rear end. Both the primary male rotor 112 and the primary female rotor 113 are rotatably arranged in the primary body 111 through bearings and mesh with each other.

[0019] The secondary rotor assembly 12 is installed at the rear end of the primary rotor assembly 11, and includes a secondary body 121, a secondary male rotor 123 and a secondary female rotor. A second air inlet 124 is provided at the rear end of the bottom of the secondary body 121, and a second air outlet 125 is provided at the top. Both the secondary male rotor 123 and the secondary female rotor are rotatably arranged in the secondary body 121 through bearings and mesh with each other. The guide member 13 is installed at the bottom of the primary body 111 and the secondary body 121 to form a gas flow channel connecting the first air outlet 115 and the second air inlet 124.

[0020] The oil circuit module 14 includes an oil circuit inlet 141, a first cooling channel 142, a second cooling channel 143 and a third cooling channel 144; the oil circuit inlet 141 is at least partially arranged at the bottom of the primary body 111. The first cooling channel 142 is connected to the oil circuit inlet 141 and is respectively connected to the bearings at the front and rear ends of the primary male rotor 112 and the primary female rotor 113; the second cooling channel 143 is connected to the oil circuit inlet 141 and is respectively connected to the bearings at the front and rear ends of the secondary male rotor 123 and the secondary female rotor. The third cooling channel 144 is connected to the oil circuit inlet 141 and is connected to the inside of the guide member 13, which can exchange heat for the air flow channel. Among them, the first cooling channel 142 is at least partially arranged in the primary body 111, which is the internal oil circuit of the primary body 111. The second cooling channel 143 and the third cooling channel 144 are external oil pipe passages of the primary body 111 and the secondary body 121, so as to make the layout of the air compressor more compact.

[0021] In this embodiment, through the hierarchical design of the first-stage rotor assembly 11 and the second-stage rotor assembly 12, the gas is compressed in stages in the air compressor, reducing the temperature rise and energy consumption during single-stage compression. At the same time, the first-stage body 111 and the second-stage body 121 are axially connected and connected through the guide member 13, which reduces the number of turns of the gas in the air compressor, reduces flow losses, and improves compression efficiency. In addition, through the setting of the oil circuit module 14, sufficient lubrication and cooling of each rotor and bearing position are ensured. In particular, the heat dissipation of the guide member 13 is increased, so that the compression process is approximately isothermal compression, reducing power consumption and improving efficiency.

[0022] like Figure 1 As shown, the oil circuit module 14 further includes an oil return line 145. Specifically, one end of the oil return line 145 is connected to the inner cavity of the guide member 13 and is arranged close to the bottom of the guide member 13; the other end is connected to the inner cavity of the primary body 111 to prevent the lubricating oil from accumulating at the bottom of the guide member 13, ensuring that there is sufficient lubricating oil supply in the primary body 111, while effectively reducing the loss of lubricating oil and improving economic benefits.

[0023] The air compressor further includes a primary drive motor 15. The primary drive motor 15 is installed at the front side of the primary rotor assembly 11, connected to the primary male rotor 112, and used to drive the primary male rotor 112 to rotate. Furthermore, the primary drive motor 15 and the primary male rotor 112 are integrally arranged, and can drive the primary male rotor 112 to rotate coaxially.

[0024] By directly connecting the first-stage drive motor 15 with the first-stage male rotor 112, the transmission efficiency is improved and the additional energy loss is reduced. At the same time, through the compact layout of the motor and rotor assembly, the space utilization of the air compressor is optimized, which facilitates the overall equipment integration and maintenance operations.

[0025] Similarly, the air compressor also includes a secondary drive motor 16. The secondary drive motor 16 is installed on the front side of the secondary rotor assembly 12, connected to the secondary male rotor 123, and used to drive the secondary male rotor 123 to rotate. The secondary drive motor 16 and the secondary male rotor 123 are integrally arranged to drive the secondary male rotor 123 to rotate coaxially.

[0026] A nozzle 1441 is provided at one end of the third cooling channel 144 connected to the interior of the guide member 13, through which oil mist can be sprayed into the interior of the guide member 13, thereby cooling the guide member 13 and reducing the resistance of the gas flow to a certain extent, thereby further improving the overall efficiency of the air compressor.

[0027] Furthermore, the primary drive motor 15 adopts variable frequency control to achieve stepless speed regulation. The secondary drive motor 16 also adopts variable frequency control to achieve stepless speed regulation. Through the above settings, the air compressor can dynamically adjust the speed to match different pressures and different working conditions, achieve a higher energy efficiency ratio, and reduce energy waste. The stepless speed regulation function also makes the equipment more stable during startup and operation.

[0028] 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 with high heat dissipation efficiency, 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); 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 rear end of the bottom; the first-stage male rotor (112) and the first-stage female rotor (113) are both rotatably arranged in the first-stage body (111) via bearings and mesh with each other; A secondary rotor assembly (12), the secondary rotor assembly (12) being arranged at the rear end of the primary rotor assembly (11), comprising a secondary body (121), a secondary male rotor (122) and a secondary female rotor (123); a second air inlet (124) is provided at the rear end of the bottom of the secondary body (121), and a second air outlet (125) is provided at the top; the secondary male rotor (122) and the secondary female rotor (123) are both rotatably arranged in the secondary body (121) via bearings and mesh with each other; a flow guide (13), the flow guide (13) being arranged at the bottom of the first-stage body (111) and the second-stage body (121) to form a gas flow channel connecting the first gas outlet (115) and the second gas inlet (124); An oil circuit module (14), the oil circuit module (14) comprising an oil circuit inlet (141), a first cooling channel (142), a second cooling channel (143) and a third cooling channel (144); the oil circuit inlet (141) is at least partially arranged at the bottom of the first-stage body (111); the first cooling channel (142) is connected to the oil circuit inlet (141) and is respectively connected to the bearings at the front and rear ends of the first-stage male rotor (112) and the first-stage female rotor (113); the second cooling channel (143) is connected to the oil circuit inlet (141) and is respectively connected to the bearings at the front and rear ends of the second-stage male rotor (122) and the second-stage female rotor (123); the third cooling channel (144) is connected to the oil circuit inlet (141) and is connected to the interior of the flow guide (13), so as to be able to exchange heat for the air flow channel.

2. The two-stage screw air compressor with high heat dissipation efficiency as claimed in claim 1, characterized in that: The air compressor further comprises a primary drive motor (15); the primary drive motor (15) is 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.

3. The two-stage screw air compressor with high heat dissipation efficiency as claimed in claim 2, characterized in that: The primary drive motor (15) and the primary male rotor (112) are integrally arranged and can drive the primary male rotor (112) to rotate coaxially.

4. The two-stage screw air compressor with high heat dissipation efficiency as claimed in claim 1, characterized in that: The air compressor further comprises a secondary drive motor (16); the secondary drive motor (16) is arranged on the front side of the secondary rotor assembly (12), connected to the secondary male rotor (122), and used for driving the secondary male rotor (122) to rotate.

5. The two-stage screw air compressor with high heat dissipation efficiency as claimed in claim 4, characterized in that: The secondary drive motor (16) and the secondary male rotor (122) are integrally arranged and can drive the secondary male rotor (122) to rotate coaxially.

6. The two-stage screw air compressor with high heat dissipation efficiency as claimed in claim 1, characterized in that: A nozzle (1441) is provided at one end of the third cooling channel (144) communicating with the interior of the flow guide (13), and oil mist can be sprayed into the interior of the flow guide (13) through the nozzle (1441).

7. The two-stage screw air compressor with high heat dissipation efficiency as claimed in claim 1, characterized in that: The primary drive motor (15) adopts frequency conversion control and can achieve stepless speed regulation.

8. The two-stage screw air compressor with high efficiency heat dissipation as claimed in claim 1, characterized in that: The secondary drive motor (16) adopts frequency conversion control and can achieve stepless speed regulation.

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