Double-screw air compressor

Abstract

The invention belongs to the technical field of air compressors, and particularly relates to a double-screw air compressor which comprises a mounting frame, a driving motor, a screw air compressor main machine, an oil-gas separation tank and a cooler, a liquid inlet groove is formed in the oil-gas separation tank, and a liquid outlet groove is formed in the oil-gas separation tank; a driving part communicated with the liquid inlet pipe is installed in the oil-gas separation tank, an oil-gas separation net matched with the gas outlet pipe is installed at the upper end of the oil-gas separation tank, the driving part is in transmission connection with the oil-gas separation net, and a residual oil pipe communicated with the screw type air compressor main machine is installed in the oil-gas separation net. According to the oil-gas separation tank, the rotating ring and the oil-gas separation net can be driven to rotate through pushing force of oil-containing compressed air, the oil-gas separation net is driven to rotate on the premise that large-particle oil drops cannot pass through the oil-gas separation net, the attached oil drops are swung towards the side wall of the oil-gas separation tank and then are separated from the oil-gas separation net, and entering of the compressed air is prevented from being affected.

Description

Technical Field

[0001] This invention belongs to the field of air compressor technology, specifically relating to a twin-screw air compressor. Background Art

[0002] Twin-screw air compressors are rotary positive displacement compressors. They are devices that compress incoming gas by the continuous meshing of two screws and discharge high-pressure gas. Most existing air compressors introduce oil into the compression chamber at the front end, so that the oil mixes with the compressed gas. During the meshing process, the screws adhere to the oil to form an oil film, which reduces hard friction and thermal damage.

[0003] However, the existing twin-screw air compressor has an oil supply pipe installed at the upper part of the oil-gas separator, which leads to the compression chamber. Small particles of lubricating oil that pass through the filter screen are injected into the compression chamber. However, this part of the lubricating oil cannot be cooled uniformly by the cooler. As a result, it mixes with the lubricating oil cooled by the oil supply pipe and raises the overall temperature of the lubricating oil. This will affect the effect of the lubricating oil inside the compression chamber, so it needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to provide a twin-screw air compressor to solve the problems existing in the prior art.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0006] A twin-screw air compressor includes a mounting frame, a drive motor, a screw air compressor main unit, an oil-gas separator, and a cooler. The mounting frame is equipped with a circulating water cooling system. The inlet pipe of the oil-gas separator is connected to the screw compressor main unit. An outlet pipe is installed at the upper end of the oil-gas separator and connected to the oil cooler. An oil outlet pipe is installed at the lower end of the oil-gas separator and connected to the cooler and the screw air compressor main unit.

[0007] The oil-gas separator has an inlet tank that is connected to the output end of the circulating water cooling system, and an outlet tank that is connected to both the inlet tank and the input end of the circulating water cooling system.

[0008] The oil-gas separator is equipped with a drive unit that is connected to the liquid inlet pipe. An oil-gas separation screen that matches the gas outlet pipe is installed at the upper end of the oil-gas separator. The drive unit is connected to the oil-gas separation screen in a transmission connection. An excess oil pipe that is connected to the screw air compressor main unit is installed inside the oil-gas separation screen.

[0009] The driving component includes a mounting plate fixedly installed with the oil-gas separator tank. The mounting plate has a driving groove inside that communicates with the liquid inlet pipe. The lower end of the mounting plate has an arc-shaped inclined groove that communicates with the driving groove. A rotating ring is rotatably and sealed in the middle of the mounting plate. An inclined plate that is slidably and sealed to the driving groove is fixedly installed on the outside of the rotating ring. The rotating ring is fixedly installed with the oil-gas separator mesh. The oil-gas separator mesh is rotatably installed with the oil-gas separator tank.

[0010] A conical filter screen is installed on the upper end of the rotating ring. The conical filter screen is fixedly connected to the oil-gas separation screen through a connecting plate. The bottom of the oil-gas separation screen is conical. Oil leakage holes are opened through the upper and lower sides of the mounting plate. The upper end of the mounting plate is inclined from the center to the periphery.

[0011] Positive pressure fan blades are fixedly installed inside the rotating ring.

[0012] The liquid inlet tank includes a spiral liquid inlet tank and a horizontal liquid inlet tank, and the liquid outlet tank includes a spiral liquid outlet tank and a horizontal liquid outlet tank. The oil-gas separator is equipped with a cooling assembly that connects the liquid inlet tank and the liquid outlet tank. The cooling assembly includes an abutment block that is fixedly connected to the oil-gas separator. The abutment block has a cooling groove inside, and the cooling groove has two one-way valves that are respectively connected to the horizontal liquid inlet tank and the horizontal liquid outlet tank.

[0013] The contact block abuts against the oil-gas separation mesh, and a fine filter screen is installed inside the oil-gas separation mesh in the oil-gas separation tank.

[0014] The abutment block is set at an angle.

[0015] The spiral inlet and spiral outlet have the same pitch, and they are not connected.

[0016] This invention can drive the rotating ring and the oil-gas separation net to rotate using the driving force of oil-containing compressed air. Under the premise of preventing large oil droplets from passing through the oil-gas separation net, the oil-gas separation net is driven to rotate, causing the attached oil droplets to be thrown towards the side wall of the oil-gas separation tank, thereby detaching from the oil-gas separation net and avoiding affecting the entry of compressed air. Attached Figure Description

[0017] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the twin-screw air compressor of the present invention;

[0019] Figure 2 This is a cross-sectional structural diagram of the twin-screw air compressor of the present invention;

[0020] Figure 3 This is a schematic diagram of the first cross-sectional structure of the oil-gas separation pipe of the present invention;

[0021] Figure 4 This is a schematic diagram of the second cross-sectional structure of the oil-gas separation pipe of the present invention;

[0022] Figure 5 This is a schematic diagram of the third cross-sectional structure of the oil-gas separation pipe of the present invention;

[0023] Figure 6 This is a schematic diagram of the fourth cross-sectional structure of the oil-gas separation pipe of the present invention;

[0024] Figure 7 This is a schematic diagram of the internal cross-sectional structure of the oil-gas separator pipe of the present invention.

[0025] The symbols for the main components are explained below:

[0026] Mounting frame 1, drive motor 11, screw air compressor main unit 12, oil-gas separator 13, cooler 14, circulating water cooling system 15, liquid inlet pipe 16, air outlet pipe 17, oil outlet pipe 18, oil-gas separator screen 22, excess oil pipe 23, mounting plate 30, arc-shaped inclined groove 31, rotating ring 32, inclined plate 33, conical filter screen 34, connecting plate 35, oil leakage hole 37, positive pressure fan blade 36, spiral liquid inlet groove 40, horizontal liquid inlet groove 41, spiral liquid outlet groove 42, horizontal liquid outlet groove 43, abutment block 44, cooling groove 45, one-way valve 46, fine filter screen 47. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] Example 1: As Figure 1-7 As shown, the twin-screw air compressor of the present invention includes a mounting frame 1, a drive motor 11, a screw air compressor main unit 12, an oil-gas separator 13, and a cooler 14. A circulating water cooling system 15 is installed inside the mounting frame 1. The inlet pipe 16 of the oil-gas separator 13 is connected to the screw air compressor main unit 12. An outlet pipe 17 is installed at the upper end of the oil-gas separator 13 and is connected to the oil cooler 14. An oil outlet pipe 18 is installed at the lower end of the oil-gas separator 13 and is connected to the cooler 14 and the screw air compressor main unit 12.

[0029] The oil-gas separator 13 has an inlet tank that is connected to the output end of the circulating water cooling system 15, and an outlet tank that is connected to both the inlet tank and the input end of the circulating water cooling system 15.

[0030] The oil-gas separator 13 is equipped with a drive unit that is connected to the liquid inlet pipe 16. The oil-gas separator 13 is equipped with an oil-gas separation net 22 that matches the gas outlet pipe 17. The drive unit is connected to the oil-gas separation net 22. The oil-gas separation net 22 is equipped with an excess oil pipe 23 that is connected to the screw air compressor main unit 12.

[0031] The inlet pipe 16 of the oil-gas separator 1 enters its interior tangentially. The oil-gas separation mesh, using existing technology, includes a support layer, a metal mesh, or a plastic skeleton to ensure the mechanical strength of the filter and prevent deformation by high-pressure airflow. The coarse filter layer has large-pore fibers on the outer layer to intercept large oil droplets >5μm, reducing the load on the inner layer. The fine filter layer has ultra-fine fibers with pore sizes of 0.1–1μm on the inner layer, which diffuse and intercept tiny oil mists of 0.01–1μm. The drainage layer has a hydrophobic structure at the bottom to prevent condensate retention.

[0032] In actual operation, when air enters the screw air compressor main unit 12 through the filter and is compressed, lubricating oil is injected into the compression chamber to cool and lubricate the screw element. When the heated oil-containing compressed air enters the oil-gas separator 13 through the check valve, the oil and compressed air are separated by the internal structure of the oil-gas separator 13. The oil is then collected, passed into the cooler, and reinjected into the compression chamber for recycling. The compressed air is then passed into the cooler 14 through the outlet pipe 17 for cooling before being discharged.

[0033] When the oil-containing compressed air enters the oil-gas separator 13 through the inlet pipe 16, it will drive the drive component to rotate, which in turn causes the oil-gas separator 22 to rotate. This causes the oil droplets to move towards the inner wall of the oil-gas separator 13 under the action of centrifugal force, while the compressed air enters the outlet pipe 17 through the oil-gas separator 22 to be cooled and discharged.

[0034] The driving component includes a mounting plate 30 fixedly installed with the oil-gas separator 13. The mounting plate 30 has a driving groove inside that communicates with the liquid inlet pipe 16. The lower end of the mounting plate 30 has an arc-shaped inclined groove 31 that communicates with the driving groove. A rotating ring 32 is rotatably installed in the middle of the mounting plate 30. An inclined plate 33 that is slidably connected to the driving groove is fixedly installed on the outside of the rotating ring 32. The rotating ring 32 is fixedly installed with the oil-gas separator 22. The oil-gas separator 22 is rotatably installed with the oil-gas separator 13.

[0035] The driving component drives the oil-gas separation net 22 to increase the centrifugal force of oil droplets, thereby improving the oil-gas separation efficiency and reducing the oil discharge from the residual oil pipe 23. When the oil-containing compressed air enters the oil-gas separator 13 tangentially, it abuts against the inclined plate 33 and pushes it. At the same time, the arc-shaped inclined groove 31 is in the same direction as the tangent. This causes the oil-containing compressed air to move downward along the direction of the arc-shaped inclined groove 31 after entering the driving groove, thereby pushing the rod inclined plate 33 and the rotating ring 32 to rotate. When the rotating ring 32 rotates, it drives the oil-gas separation net 22 to rotate, thereby increasing the centrifugal force of the oil-containing compressed air, and thus separating the grease and air under the action of centrifugal force.

[0036] This invention can drive the rotating ring and the oil-gas separation net to rotate using the driving force of oil-containing compressed air. Under the premise of preventing large oil droplets from passing through the oil-gas separation net, the oil-gas separation net is driven to rotate, causing the attached oil droplets to be thrown towards the side wall of the oil-gas separation tank, thereby detaching from the oil-gas separation net and avoiding affecting the entry of compressed air.

[0037] Example 2: Based on Example 1, a further improvement is made. A conical filter screen 34 is installed on the upper end of the rotating ring 32. The conical filter screen 34 is fixedly connected to the oil-gas separation screen 22 through the connecting plate 35. The bottom of the oil-gas separation screen 22 is conical. The mounting plate 30 has oil leakage holes 37 through the upper and lower sides. The upper end of the mounting plate 30 is inclined from the center to the periphery.

[0038] The bottom of the oil-gas separator 22 is conical, which can gather small oil droplets that enter the oil-gas separator 22 to the bottom periphery and then discharge them from the residual oil pipe 23. At the same time, when the compressed air moving upward from the middle of the rotating ring 32 filters the bottom and periphery of the oil-gas separator 22, the large oil droplets gradually slide to the periphery under the action of the conical surface and finally fall from the conical filter 34 onto the upper surface of the mounting plate 30. Since the upper surface of the mounting plate 30 is inclined, the gathered oil droplets will slide to the periphery and finally return to the bottom of the oil-gas separator 13 through the oil leakage hole 37.

[0039] A positive pressure fan blade 36 is fixedly installed inside the rotating ring 32. The positive pressure fan blade 36 rotates along with the rotating ring 32, thereby causing the positive pressure fan blade 36 to transport the compressed air at the bottom of the oil-gas separator pipe 13 upward, improving the filtration efficiency.

[0040] The liquid inlet tank includes a spiral liquid inlet tank 40 and a horizontal liquid inlet tank 41, and the liquid outlet tank includes a spiral liquid outlet tank 42 and a horizontal liquid outlet tank 43. The oil-gas separator 13 is equipped with a cooling assembly that connects the liquid inlet tank and the liquid outlet tank. The cooling assembly includes an abutment block 44 that is fixedly connected to the oil-gas separator 13. A cooling groove 45 is opened inside the abutment block 44. Two one-way valves 46 are installed inside the cooling groove 43 that are respectively connected to the horizontal liquid inlet tank 41 and the horizontal liquid outlet tank 43. The output end of the circulating water cooling system 15 can be connected to the spiral inlet tank 40 and input cooling water, so that the cooling water can pass through the spiral inlet tank 40 to the horizontal inlet tank 41. Since the horizontal inlet tank 41 is connected to the cooling tank 45 through a one-way valve, the cooling water will enter the cooling tank 43 to cool the compressed air and some small oil droplets entering the upper part. When the cooling tank 45 continues to input cooling water, the cooling water will be discharged from the one-way valve 46 on the lower side to the horizontal outlet tank 43, and then re-enter the circulating water cooling system 15 through the connected spiral outlet tank 42 to cool it and output it again.

[0041] Simultaneously, the lubricating oil is cooled during the upward input process of the spiral inlet channel 40. The oil-containing compressed air wrapped around the oil-gas separator 22 by the conical filter screen 34 is also cooled by the spiral inlet channel 40, the horizontal inlet channel 41, the spiral outlet channel 42, and the horizontal outlet channel 43.

[0042] The abutting block 44 abuts against the oil-gas separation screen 22. A fine filter screen 47 is installed inside the oil-gas separation screen 22. The abutting block 44 abuts against the oil-gas separation screen 22, allowing small oil droplets adhering to the screen to collect and drip downwards. This also prevents oil droplets from clogging the screen and affecting air intake. The fine filter screen 47 further filters the air, preventing small oil droplets from entering the exhaust pipe 17.

[0043] The contact block 44 is inclined. The inclined setting can increase the contact area between the cooling tank 45 and the air, thereby improving the cooling effect.

[0044] The spiral inlet channel 40 and the spiral outlet channel 42 have the same pitch, and the spiral inlet channel 40 and the spiral outlet channel 42 are not connected.

[0045] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A twin-screw air compressor, comprising a mounting frame, a drive motor, a screw air compressor main unit, an oil-gas separator, and a cooler, wherein a circulating water cooling system is installed inside the mounting frame, characterized in that: The inlet pipe of the oil-gas separator is connected to the screw compressor main unit, the upper end of the oil-gas separator is equipped with an outlet pipe connected to the oil cooler, and the lower end of the oil-gas separator is equipped with an oil outlet pipe connected to the cooler and the screw air compressor main unit. The oil-gas separator has an inlet tank that is connected to the output end of the circulating water cooling system, and an outlet tank that is connected to both the inlet tank and the input end of the circulating water cooling system. The oil-gas separator is equipped with a drive unit that is connected to the liquid inlet pipe. An oil-gas separation screen that matches the gas outlet pipe is installed at the upper end of the oil-gas separator. The drive unit is connected to the oil-gas separation screen in a transmission connection. An excess oil pipe that is connected to the screw air compressor main unit is installed inside the oil-gas separation screen.

2. The twin-screw air compressor according to claim 1, characterized in that: The driving component includes a mounting plate fixedly installed with the oil-gas separator tank. The mounting plate has a driving groove inside that communicates with the liquid inlet pipe. The lower end of the mounting plate has an arc-shaped inclined groove that communicates with the driving groove. A rotating ring is rotatably and sealed in the middle of the mounting plate. An inclined plate that is slidably and sealed to the driving groove is fixedly installed on the outside of the rotating ring. The rotating ring is fixedly installed with the oil-gas separator mesh. The oil-gas separator mesh is rotatably installed with the oil-gas separator tank.

3. The twin-screw air compressor according to claim 2, characterized in that: A conical filter screen is installed on the upper end of the rotating ring. The conical filter screen is fixedly connected to the oil-gas separation screen through a connecting plate. The bottom of the oil-gas separation screen is conical. Oil leakage holes are opened through the upper and lower sides of the mounting plate. The upper end of the mounting plate is inclined from the center to the periphery.

4. The twin-screw air compressor according to claim 2, characterized in that: Positive pressure fan blades are fixedly installed inside the rotating ring.

5. The twin-screw air compressor according to claim 1, characterized in that: The liquid inlet tank includes a spiral liquid inlet tank and a horizontal liquid inlet tank, and the liquid outlet tank includes a spiral liquid outlet tank and a horizontal liquid outlet tank. The oil-gas separator is equipped with a cooling assembly that connects the liquid inlet tank and the liquid outlet tank. The cooling assembly includes an abutment block that is fixedly connected to the oil-gas separator. The abutment block has a cooling groove inside, and the cooling groove has two one-way valves that are respectively connected to the horizontal liquid inlet tank and the horizontal liquid outlet tank.

6. The twin-screw air compressor according to claim 5, characterized in that: The contact block abuts against the oil-gas separation mesh, and a fine filter screen is installed inside the oil-gas separation mesh in the oil-gas separation tank.

7. The twin-screw air compressor according to claim 5, characterized in that: The abutment block is set at an angle.

8. The twin-screw air compressor according to claim 5, characterized in that: The spiral inlet and spiral outlet have the same pitch, and they are not connected.

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