Permanent magnet frequency conversion screw machine of gas compressor

Abstract

The utility model relates to the technical field of permanent magnet frequency conversion screw machines, and discloses a gas compressor permanent magnet frequency conversion screw machine which comprises a base, a tank body is arranged above the base, the tank body is used for storing gas and adjusting periodic air pressure fluctuation to protect a compressor, a gas compression mechanism is arranged above the tank body, and the gas compression mechanism is used for compressing gas. The gas compression mechanism is used for compressing gas and comprises a permanent magnet motor, a connecting shaft screw arranged at the output end of the permanent magnet motor and a gas compressor arranged at one end of the connecting shaft screw. The rotating speed of the permanent magnet motor is adjusted in real time through the control box, frequency reduction operation is pre-judged and executed in advance, the adjusting speed is increased, air pressure fluctuation is buffered, the double-acting symmetrical air cylinder layout is adopted for the air compressor, the defect of pressure fluctuation is eliminated, and the air compressor has the advantages of being simple in structure, convenient to operate and high in practicability. Therefore, the defects of a traditional screw air compressor are effectively overcome, and rapid, stable and low-fluctuation gas compression is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of permanent magnet variable frequency screw rod machine, especially gas compressor permanent magnet variable frequency screw rod machine. BACKGROUND

[0002] In industrial production, gas compression equipment is the key equipment indispensable to many industries and is widely used in petroleum chemical industry, metallurgy, machinery manufacturing, electronics, food, medicine and many other fields.

[0003] In the precision machining of the core components of the automobile engine, the stability of the high-pressure gas environment directly affects the machining precision and surface quality. The traditional machining scene relies on ordinary screw air compressor to provide power gas source, but when the output pressure exceeds the set threshold, it is forced to open the relief valve in the working mode, which causes the asynchronous motor to frequently idle (no-load rate exceeds 35%), and causes poor cutting process stability (repeated positioning accuracy of hydraulic clamps decays, radial runout of turbine impeller mortise exceeds Δ>0.012mm), serious energy waste (motor idle energy consumption accounts for 28%, and the energy consumption cost of titanium alloy cylinder cover increases $6.5), and low process adaptability (deep hole honing pressure response delay causes surface roughness Ra fluctuation 1.2-2.5μm).

[0004] Therefore, the utility model provides a kind of gas compressor permanent magnet variable frequency screw rod machine. SUMMARY

[0005] The utility model aims at overcoming the deficiencies in the prior art and providing a kind of gas compressor permanent magnet variable frequency screw rod machine, which adjusts the speed of permanent magnet motor in real time according to the gas pressure of tank body through frequency conversion control of control box, predicts and executes frequency reduction operation in advance, significantly improves the adjustment speed, the tank body can absorb and release gas, and the pressure fluctuation is controlled within ±5%, the gas pressure fluctuation is buffered, the equipment is protected, the permanent magnet motor cooperates with frequency conversion control to avoid no-load energy consumption and current impact, the metal fatigue strength of shaft screw is high, the transmission stability is guaranteed, the gas compressor adopts double-acting symmetrical cylinder layout, eliminates the single-cylinder pressure fluctuation defect, reduces the pressure fluctuation amplitude, prolongs the service life of vulnerable parts, adopts pressure-speed closed-loop control technology (adjustment response time≤0.2s), realizes machining gas pressure fluctuation rate <±0.05MPa, solves the gas pressure shock problem of traditional equipment; the positioning stability of hydraulic clamp is improved, the cylinder hole roundness tolerance is improved from IT7 level to IT5 level (diameter tolerance ±0.003mm); frequency conversion drive reduces no-load energy consumption by 62%, deep hole honing efficiency is improved by 25% (processing cycle is shortened from 4.2min / piece to 3.1min / piece); constant pressure gas supply ensures the stability of honing oil stone cutting force, and the surface roughness consistency reaches Ra≤1.0μm (CPK≥1.67).

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] A permanent magnet variable frequency screw compressor for gas includes a base, with a tank on top of the base for storing gas and regulating periodic gas pressure fluctuations to protect the compressor. A gas compression mechanism is located above the tank for compressing the gas. The gas compression mechanism includes a permanent magnet motor, a connecting screw at the output end of the permanent magnet motor, and a gas compressor at one end of the connecting screw. The permanent magnet motor provides driving force to the gas compressor, and the connecting screw ensures stable power transmission to the gas compressor. The gas compressor compresses the gas. An air intake mechanism is located above the connecting screw for filtering the gas.

[0008] The base includes symmetrically arranged sleeper rails and at least two connecting members disposed between the sleeper rails. The sleeper rails are used to install the tank body, and the connecting members are used to enhance the structural stability of the sleeper rails.

[0009] The tank body includes a storage tank, a support member fixedly connected to the storage tank above the sleeper rail via a shock-absorbing pad, a mounting base above the storage tank, a quick connector at one end of the storage tank, and an air inlet connector on the storage tank. The storage tank is used to store gas, the shock-absorbing pad is used to buffer the mechanical vibration of the compressor, the support member is used to fix the storage tank in conjunction with the sleeper rail, the mounting base is used to provide a mounting connection base, the quick connector is used to connect the gas delivery pipe, and the air inlet connector is used to connect the gas compressor in conjunction with the connecting pipe.

[0010] One end of the quick connector is equipped with a safety valve, which is used to automatically release pressure to prevent explosion when the tank exceeds the set pressure; a pressure gauge is provided on one side of the safety valve, which is used to monitor the pressure inside the tank to ensure that it operates within a safe range.

[0011] A protective component is provided between the permanent magnet motor and the gas compressor. This protective component is used to protect the coupling screw. The coupling screw is connected to the output end of the permanent magnet motor through a first flange and to the gas compressor through a second flange.

[0012] The gas compressor includes a transmission component located at one end of the connecting screw, a compression cylinder located above the transmission component, and a lubrication circulation box located on one side of the protective component. The transmission component is used to convert the rotational motion of the permanent magnet motor into the reciprocating linear motion of the piston of the compression cylinder, and the lubrication circulation box is used to lubricate the moving parts to reduce wear and dissipate heat.

[0013] The air intake mechanism includes a connecting seat located above the protective component, a protective shell located above the connecting seat, a filter element located inside the protective shell, and a connecting pipe located at one end of the filter element.

[0014] A control box is located above the permanent magnet motor. The control box is used to control the operation of the compressor and is electrically connected to the gas compression mechanism.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. Through the combination of frequency conversion control and permanent magnet motor in the control box, precise and rapid adjustment of the gas compression process is achieved. When the tank pressure approaches the safety threshold, the control algorithm built into the control box predicts in advance and performs frequency reduction operation. The speed is adjusted in real time according to the gas pressure change in the tank, avoiding the problems of slow adjustment speed, large pressure fluctuation and instability of traditional screw air compressors. The coupling screw ensures that the transmission always maintains stable operation under high frequency start and stop conditions, effectively improving the stability of the entire gas compression system.

[0017] 2. The tank stores gas and regulates periodic pressure fluctuations during gas compression, keeping pressure fluctuations within ±5%, thereby protecting precision equipment from impacts and significantly reducing the impact load on the compressor's core components. The safety valve at one end of the quick connector automatically releases pressure when the tank pressure is too high, preventing explosions. The pressure gauge monitors the tank pressure to ensure operation within a safe range. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention.

[0019] Figure 2 This is a three-dimensional view of the base of this utility model.

[0020] Figure 3 This is a three-dimensional view of the tank body of this utility model.

[0021] Figure 4 This is a three-dimensional view of the gas compression mechanism of this utility model.

[0022] Figure 5 This is a schematic diagram showing the connection between the permanent magnet motor, the coupling screw, and the gas compressor of this utility model.

[0023] Figure 6 This is a cross-sectional view of the air intake mechanism of this utility model.

[0024] Figure 7 This is a cross-sectional view of the gas compressor of this utility model.

[0025] Explanation of icon numbers:

[0026] 1-Base, 10-Rail sleeper, 11-Connector, 2-Tank body, 20-Storage tank, 21-Shock damping pad, 22-Support component, 23-Mounting seat, 24-Quick connector, 25-Inlet connector, 3-Gas compression mechanism, 30-Permanent magnet motor, 300-Motor base, 31-Coupling screw, 32-Gas compressor, 320-Transmission component, 321-Compressing cylinder, 322-Lubrication circulation box, 323-Fixed seat, 33-Protective component, 34-First flange, 35-Second flange, 4-Connecting pipe, 5-Inlet mechanism, 50-Connector, 51-Protective shell, 52-Filter element, 53-Connecting pipe, 6-Safety valve, 7-Pressure gauge, 8-Control box Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings:

[0028] like Figures 1-7As shown, this utility model relates to a permanent magnet variable frequency screw compressor for gas, including a base 1, a tank 2 on top of the base 1, the tank 2 being used to store gas and regulate periodic gas pressure fluctuations to protect the compressor, and a gas compression mechanism 3 on top of the tank 2, the gas compression mechanism 3 being used to compress the gas, the gas compression mechanism 3 including a permanent magnet motor 30, a coupling screw 31 located at the output end of the permanent magnet motor 30, and a gas compressor 32 located at one end of the coupling screw 31, the permanent magnet motor 30 being used to provide driving force to the gas compressor 32, and the coupling screw 31 being used to protect the gas. The power is stably transmitted to the gas compressor 32, which is used to compress gas. An air intake mechanism 5 is provided above the coupling screw 31, which is used to filter the gas. The tank 2 is connected to the gas compressor 32 via a connecting pipe 4. The base 1 serves as the supporting foundation, and symmetrically arranged sleeper rails 10 form a stable frame through connectors 11. The tank 2 is fixed above the sleeper rails 11 by support members 22 and shock-absorbing pads 21. The storage tank 20 serves as the main body for gas storage and pressure buffering. Its top mounting base 23 provides a connection base for the gas compression mechanism 3. The air intake connector 25... Connecting pipe 4 forms a gas passage with the output end of gas compressor 32; when permanent magnet motor 30 starts, its motor output end is rigidly connected to coupling screw 31 through first flange 34, and the other end of coupling screw 31 is connected to transmission component 320 of gas compressor 32 through second flange 35, forming a power transmission channel under the protection component 33. Transmission component 320 converts the rotational motion of permanent magnet motor 30 into the reciprocating linear motion of piston of compression cylinder. Lubrication circulation box 322 continuously lubricates and dissipates heat from moving parts through oil pipe. At this time, intake mechanism 5 is fixed above protection component 33 through connecting seat 50. The connecting pipe 53 on one side of the protective shell 51 is connected to the outside through the filter element 52. After the gas is filtered, it is input into the compression cylinder 321. The periodic gas pressure fluctuations generated during the compression process are absorbed and regulated by the storage tank 20. When the pressure inside the tank exceeds the safety threshold, the safety valve 6 at the quick connector 24 automatically opens to release pressure. The pressure gauge 7 monitors the pressure parameters in real time. When the compressed gas is output to the equipment end of the gas pipeline through the quick connector 24, the control box 8 adjusts the frequency conversion parameters of the permanent magnet motor 30 according to the preset program to make the coupling screw 31 rotate synchronously, ensuring that the gas compressor works continuously under dynamic pressure balance.

[0029] like Figure 2As shown, the base 1 includes symmetrically arranged sleeper rails 10 and at least two connecting members 11 disposed between the sleeper rails 10. The sleeper rails 10 are used to install the tank, and the connecting members 11 are used to enhance the structural stability of the sleeper rails 10. With the sleeper rails 10 and connecting members 11 as the basic support, the symmetrical layout of the sleeper rails 10 can evenly distribute the load, providing a stable installation platform for the tank and preventing the risk of tilting due to eccentric loading. At the same time, the symmetrical layout facilitates the horizontal calibration of the equipment during installation, ensuring that the overall center of gravity is centered. The lateral tensioning effect of the connecting members 11 transforms the independent sleeper rails 10 into an overall load-bearing frame, significantly improving the bending and torsional resistance of the base 1. When the equipment vibrates during operation, the connecting members 11 disperse stress concentration and avoid structural instability caused by local deformation.

[0030] like Figure 1 , 3 As shown, the tank body 2 includes a storage tank 20, a support member 22 fixedly connected to the storage tank 20 above the sleeper rail via a shock-absorbing pad 21, a mounting base 23 above the storage tank 20, a quick connector 24 at one end of the storage tank 20, and an air inlet connector 25 on the storage tank 20. The storage tank 20 is used to store gas, the shock-absorbing pad 21 is used to buffer the mechanical vibration of the compressor, the support member 22 is used to fix the storage tank 20 with the sleeper rail, the mounting base 23 is used to provide a mounting connection base, the quick connector 24 is used to connect the gas delivery pipe at the equipment end, and the air inlet connector 25 is used to connect the gas compressor with the connecting pipe 4. The storage tank 20 As a gas storage container to maintain the continuous gas supply of the compressor, the pressure fluctuation caused by the cyclical operation of the compressor is controlled within ±5% by the capacity of the storage tank 20 itself, protecting precision equipment (such as CNC machine tools) from impact, forming a buffer barrier, and reducing the impact load on the core components of the compressor. The rubber shock-absorbing pad 21 isolates the high-frequency vibration generated during the operation of the compressor, preventing the vibration energy from being transmitted to the base and causing structural resonance and reducing noise pollution. The rigid connection of the mounting base 23 ensures that the gas compression mechanism 3 and the tank 2 form a precise coaxial assembly, which simplifies the installation process and ensures transmission stability.

[0031] like Figure 1As shown, a safety valve 6 is provided at one end of the quick connector 24. This safety valve 6 is used to automatically release pressure when the tank exceeds the set pressure to prevent explosion. A pressure gauge 7 is provided on one side of the safety valve 6. This pressure gauge 7 is used to monitor the pressure inside the tank to ensure operation within a safe range. The quick connector 24, through its self-sealing and quick insertion and removal of the gas supply pipe, greatly shortens the equipment connection time while ensuring airtightness. The gas inlet connector is directly connected to the gas compressor through the connecting pipe 4, which minimizes the gas transmission path, reduces pressure loss, and improves compression efficiency. The double protection of the safety valve and the pressure gauge can instantly open to release pressure when the pressure inside the tank rises abnormally. Its response speed is far superior to that of electronic protection devices. The pressure gauge displays the pressure value in real time through a mechanical pointer, and can still provide reliable pressure monitoring even under extreme operating conditions. The combination of the two forms a complete safety closed loop from pressure warning to overpressure protection.

[0032] like Figures 4-6 As shown, a protective component 33 is provided between the permanent magnet motor 30 and the gas compressor 32. This protective component 33 is used to protect the coupling screw 31. The coupling screw 31 is connected to the output end of the permanent magnet motor 30 through a first flange 34 and to the gas compressor 32 through a second flange 35. The permanent magnet motor 30 is connected to the mounting base 23 through a motor base. The permanent magnet motor 30 uses a rotor made of permanent magnet material, eliminating the energy loss caused by the excitation current of traditional motors, enabling the motor to maintain high efficiency under full load conditions. In conjunction with the frequency conversion control of the control box 8, the speed is adjusted in real time according to the changes in gas pressure inside the tank 2, thus avoiding pressure loss. The compressor wastes electrical energy under no-load or light-load conditions, and the soft-start function eliminates the impact of current surges on the power grid. Through the power transmission of the coupling screw 31, the rotational kinetic energy of the permanent magnet motor 30 is transferred to the gas compressor 32. Under high-frequency start-stop conditions, the metal fatigue strength of the coupling screw ensures that the transmission remains stable. The protective component 33 isolates the coupling screw 31 from the external environment through a fully enclosed metal cover. The control box 8 is the intelligent control hub. Its built-in control algorithm can adjust the torque and speed of the permanent magnet motor in seconds. When the pressure of the tank 2 approaches the safety threshold, the control box 8 predicts in advance and performs frequency reduction operation.

[0033] like Figures 4-7As shown, the gas compressor 32 includes a transmission component 320 located at one end of the connecting screw 31, a compression cylinder 321 located above the transmission component 320, and a lubrication circulation box 322 located on one side of the protective component 33. The transmission component 320 is used to convert the rotational motion of the permanent magnet motor into the reciprocating linear motion of the piston of the compression cylinder. The transmission component 320 is connected to the mounting base 23 through a fixed base 323. The lubrication circulation box 322 is used to lubricate the moving parts to reduce wear and dissipate heat. The fully enclosed integrated transmission component 320 and the compression cylinder 321 effectively prevent the leakage of oil mist generated during the compression process, ensuring that the transmission components operate in a clean environment. The compression cylinder adopts a dual-cylinder symmetrical layout, and the two cylinders make the intake and compression strokes completely overlap in time, eliminating the pressure fluctuation defects of the single-cylinder compressor. Furthermore, through the airflow superposition effect, the exhaust pulse frequency is increased to twice that of the single-cylinder system. Under variable load conditions, the dual cylinders work together to reduce the pressure fluctuation amplitude, significantly improve the compression efficiency, and extend the life of vulnerable parts.

[0034] like Figure 6 As shown, the air intake mechanism 5 includes a connecting seat 50 located above the protective component, a protective shell 51 located above the connecting seat 50, a filter element 52 located inside the protective shell 51, and a connecting pipe 53 located at one end of the filter element 52. The connecting pipe 53 is connected to the compression cylinder 321. The protective shell 51 blocks the intrusion of rainwater and dust, ensuring the continuous and stable operation of the filtration system. The honeycomb reinforcing ribs of the filter element skeleton of the multi-stage composite filter layer of the filter element 52 ensure smooth airflow. The connecting pipe 53 is reinforced by a built-in spiral steel wire to prevent the pipe from collapsing and can maintain airtightness under vibration conditions.

[0035] like Figure 1 As shown, a control box 8 is provided above the permanent magnet motor 30. The control box 8 is used to control the operation of the compressor and is electrically connected to the gas compression mechanism.

[0036] The assembly and working principle of this gas compression permanent magnet variable frequency screw compressor is as follows: The base 1 serves as the supporting foundation. The base 1 consists of symmetrically arranged sleeper rails 10 and at least two connecting pieces 11 between the sleeper rails 10, forming a stable frame. The sleeper rails 10 are used to install the tank body 2. The connecting pieces 11 enhance the structural stability of the sleeper rails. The tank body 2 includes a storage tank 20, a support 22, a mounting base 23, a quick connector 24, and an air inlet connector 25. The storage tank 20 stores gas and regulates periodic gas pressure fluctuations to protect the compressor. The shock-absorbing pad 21 buffers the mechanical vibration of the compressor. The support 22, in conjunction with the sleeper rails 10, fixes the storage tank 20. The mounting base 23 provides the mounting connection base. The quick connector 24 connects to the gas delivery pipe, and the air inlet connector 25 connects to the gas compressor 32. A safety valve 6 is provided at one end for automatic pressure relief when the internal pressure is too high. A pressure gauge 7 is provided on one side to monitor the internal pressure. A quick connector 24 is quickly inserted and removed from the gas supply pipe via a self-sealing mechanism. The gas compression mechanism 3 is located above the tank body 2 and includes a permanent magnet motor 30, a coupling screw 31, and a gas compressor 32. The output end of the permanent magnet motor 30 is rigidly connected to the coupling screw 31 via a first flange 34. The other end of the coupling screw 31 is connected to the transmission component 320 of the gas compressor 32 via a second flange 35. Under the protection of the protective component 33, a power transmission channel is formed. The transmission component 320 converts the rotational motion of the permanent magnet motor 30 into the reciprocating linear motion of the piston of the compression cylinder 321. The lubrication circulation box 322 continuously lubricates and dissipates heat from the moving parts through oil pipes. Mechanism 5 is located above the coupling screw 31 and includes a connecting seat 50, a protective shell 51, a filter element 52, and a connecting pipe 53. The protective shell 51 blocks rainwater and dust, the filter element 52 uses a multi-stage composite filter layer to filter the gas, and the connecting pipe 53 has a built-in spiral steel wire reinforcement layer to prevent collapse. During operation, the permanent magnet motor 30 starts, and its output end drives the coupling screw 31 to rotate. The coupling screw 31 transmits power to the gas compressor 32. The transmission component 320 converts the rotational motion into the reciprocating linear motion of the piston of the compression cylinder 321. The air intake mechanism 5 is fixed above the protective component 33 through the connecting seat 50. The connecting pipe 53 on one side of the protective shell 51 is connected to an external air source through the filter element 52. After filtration, the gas is input into the compression cylinder 321. During compression... The generated periodic gas pressure fluctuations are absorbed and regulated by the storage tank 20. When the pressure inside the tank exceeds the safety threshold, the safety valve 6 at the quick connector 24 automatically opens to release pressure. The pressure gauge 7 monitors the pressure parameters in real time. When the compressed gas passes through the gas delivery pipeline of the quick connector 24, the control box 8 adjusts the frequency conversion parameters of the permanent magnet motor 30 according to the preset program, so that the coupling screw 31 always maintains a stable speed, ensuring that the gas compressor 32 works continuously in a dynamic pressure balance state. When supplying gas to the outside, its pressure-speed closed-loop control technology (adjustment response time ≤ 0.2s) achieves a processing gas pressure fluctuation rate of < ±0.05MPa, which improves the positioning stability of the hydraulic fixture of the equipment and improves the roundness tolerance of the processed cylinder bore from IT7 grade to IT5 grade (diameter tolerance ±0.05MPa).(0.03mm); Variable frequency drive reduces no-load energy consumption by 62% and increases efficiency by 25% in deep hole honing (processing cycle time reduced from 4.2min / piece to 3.1min / piece); constant pressure air supply ensures stable cutting force of the honing stone, and surface roughness consistency reaches Ra≤1.0μm (CPK≥1.67).

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. Therefore, without departing from the design spirit of the present utility model, any equivalent changes or modifications made by those skilled in the art to the structure, features and principles of the present utility model should fall within the protection scope of the patent application of the present utility model.

Claims

1. A gas compressor permanent magnet variable frequency screw compressor, characterized in that: The system includes a base, on which a tank is located. The tank is used to store gas and regulate periodic gas pressure fluctuations to protect the compressor. Above the tank is a gas compression mechanism for compressing gas. The gas compression mechanism includes a permanent magnet motor, a connecting screw at the output end of the permanent magnet motor, and a gas compressor at one end of the connecting screw. The permanent magnet motor provides driving force to the gas compressor, and the connecting screw maintains stable power transmission to the gas compressor. The gas compressor compresses gas. Above the connecting screw is an air intake mechanism for filtering gas.

2. The gas compressor permanent magnet variable frequency screw compressor according to claim 1, characterized in that: The base includes symmetrically arranged sleeper rails and at least two connecting members disposed between the sleeper rails. The sleeper rails are used to install the tank body, and the connecting members are used to enhance the structural stability of the sleeper rails.

3. A gas compressor permanent magnet variable frequency screw compressor according to claim 2, characterized in that: The tank body includes a storage tank, a support member fixedly connected to the storage tank above the sleeper rail via a shock-absorbing pad, a mounting base above the storage tank, a quick connector at one end of the storage tank, and an air inlet connector on the storage tank. The storage tank is used to store gas, the shock-absorbing pad is used to buffer the mechanical vibration of the compressor, the support member is used to fix the storage tank in conjunction with the sleeper rail, the mounting base is used to provide a mounting connection base, the quick connector is used to connect the gas delivery pipe, and the air inlet connector is used to connect the gas compressor in conjunction with the connecting pipe.

4. A gas compressor permanent magnet variable frequency screw compressor according to claim 3, characterized in that: One end of the quick connector is equipped with a safety valve, which is used to automatically release pressure to prevent explosion when the tank exceeds the set pressure; a pressure gauge is provided on one side of the safety valve, which is used to monitor the pressure inside the tank to ensure that it operates within a safe range.

5. A gas compressor permanent magnet variable frequency screw compressor according to claim 1, characterized in that: A protective component is provided between the permanent magnet motor and the gas compressor. This protective component is used to protect the coupling screw. The coupling screw is connected to the output end of the permanent magnet motor through a first flange and to the gas compressor through a second flange.

6. A gas compressor permanent magnet variable frequency screw compressor according to claim 5, characterized in that: The gas compressor includes a transmission component located at one end of the connecting screw, a compression cylinder located above the transmission component, and a lubrication circulation box located on one side of the protective component. The transmission component is used to convert the rotational motion of the permanent magnet motor into the reciprocating linear motion of the piston of the compression cylinder, and the lubrication circulation box is used to lubricate the moving parts to reduce wear and dissipate heat.

7. A gas compressor permanent magnet variable frequency screw compressor according to claim 6, characterized in that: The air intake mechanism includes a connecting seat located above the protective component, a protective shell located above the connecting seat, a filter element located inside the protective shell, and a connecting pipe located at one end of the filter element.

8. A gas compressor permanent magnet variable frequency screw compressor according to claim 1, characterized in that: A control box is located above the permanent magnet motor. The control box is used to control the operation of the compressor and is electrically connected to the gas compression mechanism.

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