Variable frequency screw air compressor

Abstract

The application relates to the technical field of air compressors and discloses a variable-frequency screw air compressor which comprises a base, the upper surface of the base is provided with a main machine, an air inlet valve is fixedly connected in the main machine, the main machine is connected with an air filter through a pipeline, the outer wall of the air filter is provided with an air inlet, the inside of the air filter is provided with a dismounting mechanism, one side of the dismounting mechanism is provided with a rotating shaft one, the outer wall of the rotating shaft one is provided with a ratchet wheel at one end, and the tooth end of the ratchet wheel is hingedly connected with a pawl. The differential pressure early warning sensor is used for monitoring the filter plate blockage state, an automatic reverse blowing cleaning process is triggered, intelligent response is realized, the ratchet wheel and the pawl lock the cleaning assembly when normal air is inhaled, the airflow drives the bristles to sweep when reverse blowing, no additional power is needed, bidirectional airflow is efficiently utilized, impurities are simultaneously transported to a dust collection bag when reverse blowing, secondary pollution is avoided, and the cleaning effect is improved. The problem that the system efficiency is reduced due to filter plate blockage is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air compressors, in particular to a variable frequency screw air compressor. BACKGROUND

[0002] An air compressor is a device that converts mechanical energy into gas pressure energy, used to compress air and store it in a designated container. Variable frequency screw compressors can adapt to different working conditions and load changes, and have good adaptability. Therefore, a variable frequency screw air compressor is used.

[0003] A variable frequency screw air compressor is a device that uses screw rotors to compress air. It uses variable frequency technology to adjust the operating speed of the motor, thereby controlling the output pressure and flow of the compressor. In the existing air compressor technology, after filtering the air, it is difficult to clean the inside of the air filter, and the filter plate is easily blocked, which affects the filtering effect of impurities in the compressed air, thereby affecting the air suction and increasing the air resistance and machine energy consumption. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a variable frequency screw air compressor, which solves the problem of monitoring the filter plate blockage state of the existing differential pressure early warning sensor, automatically triggers the back blowing cleaning process, realizes intelligent response, locks the cleaning assembly with the ratchet pawl during normal air intake, and drives the bristles to clean with the air flow during back blowing. No additional power is required, efficient use of bidirectional airflow is achieved, impurities are simultaneously transported to the dust bag during back blowing, secondary pollution is avoided, and the cleaning effect is improved.

[0005] To achieve the above purpose, the following technical scheme is adopted: a variable frequency screw air compressor, comprising a base, a main machine is arranged on the upper surface of the base, an air inlet valve is fixedly connected in the main machine, the main machine and an air filter are connected through a pipeline, an air inlet is arranged on the outer wall of the air filter, a dismounting mechanism is arranged in the air filter, a rotating shaft one is arranged on one side of the dismounting mechanism, a ratchet wheel is arranged at one end of the outer wall of the rotating shaft one, a pawl is engagedly connected at the tooth end of the ratchet wheel, a rotating shaft two is arranged at one end of the pawl, one end of the rotating shaft two is arranged on one side of the dismounting mechanism, a plurality of fan blades are arranged at the other end of the outer wall of the rotating shaft one, a plurality of bristles are arranged on one side of the fan blades, one end of the bristles is attached to one side of the dismounting mechanism, one end of the rotating shaft one is attached to the dismounting mechanism, the other end of the rotating shaft one is rotatably connected with a fixing frame, the fixing frame is arranged on the inner wall of the air filter, and a back blowing dust collecting mechanism is arranged at both ends of the air filter.

[0006] Through the above technical solution, the differential pressure early warning sensor monitors the filter plate blockage status and automatically triggers the back-blowing cleaning process to achieve intelligent response. During normal air intake, the ratchet and pawl lock the cleaning components. During back-blowing, the airflow drives the brush bristles to clean without additional power, achieving efficient utilization of bidirectional airflow. At the same time as back-blowing, impurities are simultaneously transported to the dust collection bag to avoid secondary pollution and improve the cleaning effect.

[0007] Preferably, the disassembly mechanism includes a pull block, the outer wall of which is disposed inside the air filter. A filter plate is fixedly connected to the lower surface of the pull block, and the outer wall of the filter plate is slidably connected to the inside of the air filter. A locking pin is slidably connected inside the pull block, and the outer wall of the locking pin is slidably connected to the inside of the air filter. A first spring is fixedly connected to the outer wall of the locking pin, and the outer wall of the first spring is fixedly connected to the inside of the pull block. A push pin is abutted against the outer wall of the locking pin, and the outer wall of the push pin is slidably connected to the inside of the air filter. A fixing plate is disposed on one side of the push pin, and the outer wall of the fixing plate is fixedly connected to the outer wall of the push pin. The outer wall of the fixing plate is slidably connected to the inside of the air filter. A second spring is slidably connected to the outer wall of the push pin, one end of which is fixedly connected to the inside of the air filter, and the other end of which is fixedly connected to the outer wall of the fixing plate. A push plate is fixedly connected to the outer wall of the fixing plate, and the outer wall of the push plate is slidably connected to the inside of the air filter.

[0008] Preferably, a power system is mounted on the upper surface of the base, the power system includes a motor, the lower surface of the motor is mounted on the upper surface of the base, a coupling is fixedly provided at the output end of the motor, and a central bracket is provided on the outer wall of the coupling, the central bracket being located between the motor and the main unit.

[0009] Preferably, an electronic control component is mounted on the upper surface of the base, a frequency converter is installed inside the electronic control component, and a display screen is provided on the outer wall of the electronic control component.

[0010] Preferably, an oil cooler is provided on the upper surface of the base, and the oil cooler is connected to a mixed-flow temperature control valve through a pipe.

[0011] Preferably, the oil cooler has multiple front cooling fans installed inside, which are symmetrically arranged inside the oil cooler. Cooling oil pipes are fixedly connected to the side of the oil cooler, and a mixing tee is provided on the outer wall of the cooling oil pipe. The three ports of the mixing tee are respectively connected to the cooling oil pipe, the mixing temperature control valve, and the oil-gas system through pipelines.

[0012] Preferably, the lower surface of the oil and gas system is mounted on the upper surface of the base, a minimum pressure valve is installed at the top of the oil and gas system, and a safety valve is installed on the side of the oil and gas system.

[0013] Preferably, the minimum pressure valve is connected to the aftercooler via a pipe, an aftercooler fan is installed at the bottom of the aftercooler, and an air outlet is fixedly connected to the side of the aftercooler.

[0014] Preferably, the main unit has an internal fuel injection pipe installed inside, and the fuel injection pipe is located on the side of the screw rotor inside the main unit.

[0015] Preferably, the back-flushing dust collection mechanism includes a differential pressure early warning sensor, which is installed on the inner wall of the air filter. One end of the air filter is provided with a connecting pipe, one end of the connecting pipe is provided with a blower, and the other end of the air filter is provided with a connecting hose, one end of the connecting hose is provided with a dust collection bag.

[0016] Working principle: Air enters the air filter through the air inlet, is filtered by the filter plate, and is then delivered to the main unit. During normal filtration, the ratchet and pawl engage to lock the first rotating shaft, preventing interference with filtration efficiency. When the differential pressure warning sensor detects filter plate blockage, it triggers the blower to reverse the airflow. This airflow drives the fan blades to clean the filter plate with brush bristles. Impurities are collected in the dust bag through the connecting hose, achieving intelligent backflushing cleaning.

[0017] When the filter plate needs to be replaced, push the push plate to squeeze the second spring, and the push column will push the locking column out of the slot of the air filter, releasing the lock of the pull block, and the filter plate can be pulled out. During installation, the first spring rebounds and the locking column is re-locked into the slot to complete the fixation, realizing tool-free quick disassembly.

[0018] The motor drives the screw rotor inside the main unit to compress air via a coupling, and the central bracket supports the coupling to ensure transmission stability. The electronic control unit receives signals from various sensors and adjusts the motor speed through a frequency converter to achieve precise control of the output air volume; the display screen shows operating parameters such as pressure and temperature in real time.

[0019] Compressed air is injected with lubricating oil through the oil injection pipe at the compressor head for lubrication and cooling, then enters the oil cooler, where it is initially cooled by the pre-cooling fan. The mixed-flow temperature control valve regulates the oil circuit according to the oil temperature: at low temperatures, the lubricating oil directly enters the oil-air system through the mixed-flow tee; at high temperatures, some lubricating oil is diverted to the oil cooler for cooling before entering. The oil-air system separates the oil from the compressed air; the minimum pressure valve ensures the lubricating oil circulation power, and the safety valve ensures system pressure safety. The separated compressed air enters the aftercooler, undergoes secondary cooling by the aftercooling fan, and is then discharged from the outlet, completing the entire compression process.

[0020] This invention provides a variable frequency screw air compressor. It has the following beneficial effects:

[0021] 1. This invention monitors the filter plate clogging status using a differential pressure early warning sensor, automatically triggering the backflushing cleaning process for intelligent response. During normal air intake, the ratchet and pawl lock the cleaning components; during backflushing, the airflow drives the brush bristles for cleaning, requiring no additional power and achieving efficient utilization of bidirectional airflow. Simultaneously, backflushing conveys impurities to the dust bag, preventing secondary pollution and improving cleaning effectiveness. This solves the problem of reduced system efficiency due to filter plate clogging.

[0022] 2. This invention facilitates the adsorption and filtration of impurities through the filter plate inside the air filter. The air filter can be slid out by the insertion of the locking pin, which makes it easy to install or remove the filter plate. The quick-release design facilitates regular cleaning of the filter plate and prevents blockage from affecting the normal air filtration effect. By optimizing the filtered air, the resistance of subsequent air passage can be reduced, thereby reducing the energy consumption of the compressor.

[0023] 3. This invention compresses air by drawing it into the main unit, then filters and removes impurities from the compressed air before it enters the subsequent cooling and separation stage. This effectively removes dust, oil droplets, moisture, and other impurities, improving air quality while also reducing compressor energy consumption.

[0024] 4. The compressed air filtered by this invention will first be cooled and then separated. After the separation is completed, it will be cooled a second time to further reduce the temperature of the compressed air. This makes it easier for the moisture and oil in the air to condense and be separated, thereby improving the dryness and cleanliness of the compressed air.

[0025] 5. This invention uses a frequency converter installed inside the electronic control component to adjust the speed of the motor. When used in conjunction with a mixed-flow control system, it enables the compressor to adapt to changing operating conditions, ensuring stable operation during both peak and off-peak periods and rapid response to load changes. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of the front side proposed in this invention;

[0027] Figure 2 This is a three-dimensional schematic diagram of the rear side proposed in this invention;

[0028] Figure 3 This is a partial structural diagram of the power system proposed in this invention;

[0029] Figure 4 This is a partial structural diagram of the oil cooler proposed in this invention;

[0030] Figure 5 This is a partial structural diagram of the air filter proposed in this invention;

[0031] Figure 6This is a schematic diagram of a partial structure at the locking post proposed in this invention;

[0032] Figure 7 This is a partial structural diagram of the blower section proposed in this invention;

[0033] Figure 8 This is a schematic diagram of a partial structure of the fan blade proposed in this invention.

[0034] The components include: 1. Base; 2. Electrical control components; 3. Frequency converter; 4. Power system; 401. Motor; 402. Center bracket; 403. Coupling; 5. Intake valve; 6. Air filter; 7. Oil cooler; 8. Front cooling fan; 9. Cooling oil pipe; 10. Display screen; 11. Mixing flow tee; 12. Mixing flow temperature control valve; 13. Oil-air system; 14. Minimum pressure valve; 15. Safety valve; 16. Aftercooler; 17. Aftercooling fan; 18. 19. Air outlet; 20. Oil injection pipe of the machine head; 21. Pull block; 22. Filter plate; 23. Locking post; 24. First spring; 25. Push post; 26. Fixing plate; 27. Push plate; 28. Second spring; 29. ​​Main unit; 30. Air inlet; 31. Blower; 32. Connecting pipe; 33. Connecting hose; 34. Dust collection bag; 35. Fan blade; 36. Brush bristles; 37. Rotating shaft one; 38. Ratchet; 39. Pawl; 40. Differential pressure warning sensor; 41. Fixing bracket. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see the appendix Figure 1 Appendix Figure 5 -Appendix Figure 8A variable frequency screw air compressor includes a base 1, characterized in that: a main unit 28 is disposed on the upper surface of the base 1, an intake valve 5 is fixedly connected inside the main unit 28, the main unit 28 is connected to an air filter 6 through a pipe, an air inlet 29 is disposed on the outer wall of the air filter 6, a disassembly mechanism is disposed inside the air filter 6, a rotating shaft 36 is disposed on one side of the disassembly mechanism, a ratchet 37 is disposed at one end of the outer wall of the rotating shaft 36, a pawl 38 is engaged with the teeth of the ratchet 37, a rotating shaft 2 is disposed at one end of the pawl 38, one end of the rotating shaft 2 is disposed on one side of the disassembly mechanism, and a plurality of fan blades 34 are disposed at the other end of the outer wall of the rotating shaft 36. A number of bristles 35 are provided on one side, with one end of the bristles 35 attached to one side of the disassembly mechanism. One end of the rotating shaft 36 is attached to the disassembly mechanism, and the other end of the rotating shaft 36 is rotatably connected to a fixing frame 40. The end of the fixing frame 40 is set on the inner wall of the air filter 6. Back-blowing dust collection mechanisms are provided at both ends of the air filter 6. The back-blowing dust collection mechanism includes a differential pressure warning sensor 39, which is set on the inner wall of the air filter 6. A connecting pipe 31 is provided at one end of the air filter 6, and a blower 30 is provided at one end of the connecting pipe 31. A connecting hose 32 is provided at the other end of the air filter 6, and a dust collection bag 33 is provided at one end of the connecting hose 32.

[0037] Specifically, when the air compressor is running, air enters the air filter 6 through the air inlet 29, is filtered by the filter plate 21, and is then transported to the main unit 28 through the pipeline. During normal filtration, the airflow direction causes the ratchet 37 and pawl 38 to engage, restricting the rotation of the shaft 36 and ensuring stable filtration by the filter plate 21. When the differential pressure warning sensor 39 detects that the pressure difference across the filter plate 21 exceeds the threshold, indicating that the filter plate is blocked, it sends an electrical signal to the blower 30. After the blower 30 starts, it delivers a reverse airflow into the air filter 6 through the connecting pipe 31, opposite to the normal air intake direction. This airflow direction is consistent with the engagement direction of the ratchet 37 and pawl 38, causing the fan blades 34 to rotate, which in turn drives the shaft 36 to rotate. When the fan blades 34 rotate, the bristles 35 repeatedly clean the surface of the filter plate 21, removing impurities. At the same time, the reverse airflow carries the removed impurities into the dust collection bag 33 through the connecting hose 32, achieving simultaneous cleaning and collection.

[0038] The system monitors filter plate clogging status using a differential pressure warning sensor, automatically triggering a backflushing cleaning process for intelligent response. During normal air intake, the ratchet and pawl lock the cleaning components; during backflushing, the airflow drives the brushes for cleaning, requiring no additional power and achieving efficient utilization of bidirectional airflow. Simultaneously, backflushing transports impurities to the dust bag, preventing secondary pollution and improving cleaning effectiveness. This solves the problem of reduced system efficiency due to filter plate clogging.

[0039] Please see the appendix Figure 1 -Appendix Figure 4The disassembly mechanism includes a pull block 20, the outer wall of which is disposed inside the air filter 6. A filter plate 21 is fixedly connected to the lower surface of the pull block 20, and the outer wall of the filter plate 21 is slidably connected to the inside of the air filter 6. A locking post 22 is slidably connected inside the pull block 20, and the outer wall of the locking post 22 is slidably connected to the inside of the air filter 6. A first spring 23 is fixedly connected to the outer wall of the locking post 22, and the outer wall of the first spring 23 is fixedly connected to the inside of the pull block 20. A push post 24 abuts against the outer wall of the locking post 22, and the outer wall of the push post 24 is slidably connected to... Inside the air filter 6, a fixing plate 25 is provided on one side of the push column 24. The outer wall of the fixing plate 25 is fixedly connected to the outer wall of the push column 24. The outer wall of the fixing plate 25 is slidably connected to the inside of the air filter 6. A second spring 27 is slidably connected to the outer wall of the push column 24. One end of the second spring 27 is fixedly connected to the inside of the air filter 6. The other end of the second spring 27 is fixedly connected to the outer wall of the fixing plate 25. A push plate 26 is fixedly connected to the outer wall of the fixing plate 25. The outer wall of the push plate 26 is slidably connected to the inside of the air filter 6.

[0040] Specifically, the air filter 6 filters the air entering the main unit 28, removing impurities. The filter plate 21 inside the air filter 6 removes impurities. The pull block 20 fixes the filter plate 21 in place, allowing the filter plate 21 to be easily pulled out of the air filter 6. The locking post 22 inside the pull block 20 limits and fixes the pull block 20 and the air filter 6. When the locking post 22 is locked inside the air filter 6, the position of the filter plate 21 inside the air filter 6 is fixed. The first spring 23 has a rebound function. When the locking post 22 is not pushed by the push post 24, the first spring 23 will use its own elasticity to lock the locking post 22 inside the air filter 6, thus allowing the filter plate 21 to stably filter the air inside the air filter 6.

[0041] The push post 24 fixes the fixing plate 25 and pushes the locking post 22. When the locking post 22 is squeezed by the push post 24, it will slide out of the air filter 6. When the locking post 22 is completely retracted into the pull block 20, the filter plate 21 can be pulled out. The fixing plate 25 fixes the push plate 26. By pushing the push plate 26 to slide, the fixing plate 25 can slide synchronously against the inner wall of the air filter 6, thereby pushing the push post 24 to squeeze and push the locking post 22. The second spring 27 is placed between the air filter 6 and the fixing plate 25. The second spring 27 will be squeezed by the sliding of the fixing plate 25. When the second spring 27 is no longer compressed, it will push the push post 24 to slide in the opposite direction through the rebound, releasing the push post 24 from pushing the locking post 22.

[0042] Please see the appendix Figure 1A power system 4 is installed on the upper surface of the base 1. The power system 4 includes a motor 401. The lower surface of the motor 401 is installed on the upper surface of the base 1. A coupling 403 is fixedly installed at the output end of the motor 401. A central bracket 402 is provided on the outer wall of the coupling 403. The central bracket 402 is located between the motor 401 and the main unit 28.

[0043] Specifically, the base 1 supports and fixes the motor 401. The motor 401 can drive the coupling 403 to rotate. The coupling 403 connects the motor 401 and the main unit 28 and transmits power to the main unit 28. The central bracket 402 can provide stable support for the motor 401 and the main unit 28. By driving the screw rotor inside the main unit 28 to rotate, the intake air can be compressed.

[0044] Please see the appendix Figure 1 An electronic control component 2 is installed on the upper surface of the base 1. An inverter 3 is installed inside the electronic control component 2. A display screen 10 is installed on the outer wall of the electronic control component 2.

[0045] Specifically, the base 1 supports the electronic control component 2, which is the core of the compressor control system. It is responsible for receiving and processing signals from various sensors of the compressor and controlling the operation of the compressor according to the preset control logic. The inverter 3 inside the electronic control component 2 can adjust the running speed of the motor 401, thereby controlling the output of the compressor. The inverter 3 achieves smooth adjustment of the speed of the motor 401 by changing the frequency and voltage of the power supply, providing precise speed control and adapting to different working conditions. The display screen 10 can display the key parameters of the compressor in real time, such as pressure, temperature, current, and voltage.

[0046] Please see the appendix Figure 4 -Appendix Figure 7 An oil cooler 7 is installed on the upper surface of the base 1. The oil cooler 7 is connected to the mixed-flow temperature control valve 12 through a pipe. Multiple front cooling fans 8 are installed inside the oil cooler 7. The front cooling fans 8 are symmetrically arranged inside the oil cooler 7. A cooling oil pipe 9 is fixedly connected to the side of the oil cooler 7. A mixed-flow tee 11 is installed on the outer wall of the cooling oil pipe 9. The three ports of the mixed-flow tee 11 are respectively connected to the cooling oil pipe 9, the mixed-flow temperature control valve 12 and the oil-gas system 13 through pipes. The lower surface of the oil-gas system 13 is installed on the upper surface of the base 1. A minimum pressure valve 14 is installed at the top of the oil-gas system 13. A safety valve 15 is installed on the side of the oil-gas system 13. The minimum pressure valve 14 is connected to the aftercooler 16 through a pipe. An aftercooler fan 17 is installed at the bottom of the aftercooler 16. An air outlet 18 is fixedly connected to the side of the aftercooler 16.

[0047] Specifically, the filtered compressed air enters the oil cooler 7 through a pipe. The function of the oil cooler 7 is to cool the compressed air and lubricating oil. The cooling air carries away heat, helping to dissipate the heat generated during compression, preventing overheating, and effectively lowering the oil temperature. This ensures the lubricating oil operates at a suitable temperature, thereby improving the compressor's efficiency and lifespan. The pre-cooling fan 8 is used to pre-cool the compressed air before it enters the compressor, reducing the compressor's heat load and improving compression efficiency. The cooling oil pipe 9 is responsible for transporting the cooled lubricating oil for recycling. In the oil cooling system, the mixing tee 11 is used to mix the cooling oil and compressed air. Under low-temperature conditions, the mixing temperature control valve 12 is closed, and the lubricating oil directly enters the oil-air system 13 through the mixing tee 11. Conversely, under high-temperature conditions... Under operating conditions, the mixed-flow temperature control valve 12 opens, and the lubricating oil is diverted to the oil cooler 7 for cooling before entering the oil-air system 13. The oil-air system 13 can separate water and oil in the air. The minimum pressure valve 14 ensures the circulation power of the lubricating oil and avoids insufficient oil supply during low-pressure operation. At the same time, when the pressure in the oil-air system 13 exceeds the preset safety value, the safety valve 15 will automatically open to release part of the pressure and prevent the pressure from continuing to rise, thereby protecting the equipment and pipelines from damage. The separated compressed air will enter the interior of the aftercooler 16 for secondary cooling through the pipeline. The aftercooling fan 17 is used to cool the hot compressed air or lubricating oil in the aftercooler 16. The cooling air carries away the heat, and the compressed and cooled air can be discharged through the air outlet 18 set on the side of the aftercooler 16.

[0048] Please see the appendix Figure 7 The machine head oil injection pipe 19 is installed inside the main unit 28, and the machine head oil injection pipe 19 is located on the side of the screw rotor inside the main unit 28.

[0049] Specifically, the oil injection pipe 19 in the compressor head is an important component of the variable frequency screw air compressor. Its main function is to spray lubricating oil into the screw rotor inside the main unit 28, thereby achieving the purpose of lubrication and cooling. The lubricating oil will form an oil film on the surface of the screw, reducing friction loss and cooling the heat generated during compression. This effectively reduces friction and wear between the moving parts of the screw, while also helping to control the heat generated during compression, preventing the screw from seizing due to high temperature expansion, ensuring smooth operation of the screw rotor, improving lubrication efficiency, and extending the service life of the equipment.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A variable frequency screw air compressor, comprising a base (1), characterized in that: The upper surface of the base (1) is provided with a main unit (28). An air intake valve (5) is fixedly connected inside the main unit (28). The main unit (28) is connected to the air filter (6) through a pipe. An air inlet (29) is provided on the outer wall of the air filter (6). A disassembly mechanism is provided inside the air filter (6). A rotating shaft (36) is provided on one side of the disassembly mechanism. A ratchet (37) is provided at one end of the outer wall of the rotating shaft (36). A pawl (38) is engaged with the tooth end of the ratchet (37). One end of the pawl (38) is provided with a... A second rotating shaft is provided, one end of which is located on one side of the disassembly mechanism. The other end of the outer wall of the first rotating shaft (36) is provided with several fan blades (34). One side of each fan blade (34) is provided with several bristles (35). One end of each bristle (35) is attached to one side of the disassembly mechanism. One end of the first rotating shaft (36) is attached to the disassembly mechanism. The other end of the first rotating shaft (36) is rotatably connected to a fixing frame (40). The end of the fixing frame (40) is located on the inner wall of the air filter (6). The two ends of the air filter (6) are provided with a back-blowing dust collection mechanism. The back-blowing dust collection mechanism includes a differential pressure early warning sensor (39), which is installed on the inner wall of the air filter (6). One end of the air filter (6) is provided with a connecting pipe (31), one end of the connecting pipe (31) is provided with a blower (30), and the other end of the air filter (6) is provided with a connecting hose (32), one end of the connecting hose (32) is provided with a dust collection bag (33). The disassembly mechanism includes a pull block (20), the outer wall of which is disposed inside the air filter (6). A filter plate (21) is fixedly connected to the lower surface of the pull block (20). The outer wall of the filter plate (21) is slidably connected to the inside of the air filter (6). A locking post (22) is slidably connected inside the pull block (20). The outer wall of the locking post (22) is slidably connected to the inside of the air filter (6). A first spring (23) is fixedly connected to the outer wall of the locking post (22). The outer wall of the first spring (23) is fixedly connected to the inside of the pull block (20). A push post (24) abuts against the outer wall of the locking post (22). The outer wall of the push post (24) slides... The push column (24) is slidably connected to the air filter (6) and a fixing plate (25) is provided on one side of the push column (24). The outer wall of the fixing plate (25) is fixedly connected to the outer wall of the push column (24), and the outer wall of the fixing plate (25) is slidably connected to the air filter (6). A second spring (27) is slidably connected to the outer wall of the push column (24). One end of the second spring (27) is fixedly connected to the air filter (6), and the other end of the second spring (27) is fixedly connected to the outer wall of the fixing plate (25). A push plate (26) is fixedly connected to the outer wall of the fixing plate (25), and the outer wall of the push plate (26) is slidably connected to the air filter (6). A power system (4) is installed on the upper surface of the base (1). The power system (4) includes a motor (401). The lower surface of the motor (401) is installed on the upper surface of the base (1). A coupling (403) is fixedly provided at the output end of the motor (401). A central bracket (402) is provided on the outer wall of the coupling (403). The central bracket (402) is located between the motor (401) and the host (28).

2. The variable frequency screw air compressor according to claim 1, characterized in that: An electronic control component (2) is installed on the upper surface of the base (1), a frequency converter (3) is installed inside the electronic control component (2), and a display screen (10) is provided on the outer wall of the electronic control component (2).

3. The variable frequency screw air compressor according to claim 1, characterized in that: An oil cooler (7) is provided on the upper surface of the base (1), and the oil cooler (7) is connected to the mixed flow temperature control valve (12) through a pipe.

4. A variable frequency screw air compressor according to claim 3, characterized in that: Multiple front cooling fans (8) are installed inside the oil cooler (7). The front cooling fans (8) are symmetrically arranged inside the oil cooler (7). A cooling oil pipe (9) is fixedly connected to the side of the oil cooler (7). A mixing tee (11) is provided on the outer wall of the cooling oil pipe (9). The three ports of the mixing tee (11) are respectively connected to the cooling oil pipe (9), the mixing temperature control valve (12), and the oil-gas system (13) through pipes.

5. A variable frequency screw air compressor according to claim 4, characterized in that: The lower surface of the oil and gas system (13) is mounted on the upper surface of the base (1), a minimum pressure valve (14) is mounted on the top of the oil and gas system (13), and a safety valve (15) is mounted on the side of the oil and gas system (13).

6. A variable frequency screw air compressor according to claim 5, characterized in that: The minimum pressure valve (14) is connected to the aftercooler (16) by a pipe. An aftercooler fan (17) is installed at the bottom of the aftercooler (16), and an air outlet (18) is fixedly connected to the side of the aftercooler (16).

7. A variable frequency screw air compressor according to claim 1, characterized in that: The machine head oil injection pipe (19) is installed inside the main unit (28), and the machine head oil injection pipe (19) is located on the side of the screw rotor inside the main unit (28).

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