Permanent magnet frequency conversion screw air compressor and use method thereof

Abstract

The invention discloses a permanent-magnet variable-frequency screw air compressor and a using method thereof. The air compressor comprises a compressor body, an oil-gas separation mechanism, an oil scraping mechanism, an oil brushing mechanism and an oil suction mechanism. According to the permanent magnet frequency conversion screw type air compressor, the high-efficiency permanent magnet motor and the frequency converter are combined, so that the rotating speed of the motor is accurately adjusted, the energy efficiency is remarkably improved, and the energy consumption is reduced. The innovative oil-gas separation mechanism adopts a filter screen cylinder and a spiral separation blade, so that the oil-gas separation efficiency is greatly improved, the loss of lubricating oil is reduced, and the service life of equipment is prolonged. In addition, an oil scraping mechanism, an oil brushing mechanism and an oil suction mechanism are arranged, so that smoothness of the filter screen cylinder is ensured, the risk of oil contamination blockage is reduced, and the stability and the operation efficiency of the equipment are improved. And a unique cooling mechanism keeps the oil-gas separator in an optimal temperature range all the time through cooling water circulation, so that the oil-gas separation effect is further optimized, and the reliability and efficient operation of the whole system are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field related to air compressors, and in particular to a permanent magnet variable frequency screw air compressor and a use method thereof. Background Art

[0002] In modern industry, air compressors are an important power source and are widely used in pneumatic equipment, spraying, pneumatic tools and other fields. In recent years, permanent magnet frequency conversion technology has gradually gained attention due to its superior energy efficiency and good adjustment capabilities. Compared with traditional motors, permanent magnet motors can maintain high efficiency under different load conditions. At the same time, through frequency conversion adjustment technology, the motor speed can be accurately controlled, further improving energy efficiency and reducing energy consumption.

[0003] However, the existing permanent magnet variable frequency air compressors still have room for improvement in oil-gas separation and lubrication management. For example, oil-gas separation relies solely on filtering through the filter cylinder, resulting in low oil-gas separation efficiency; for example, lubricating oil drips automatically due to gravity, and some oil adheres to the filter cylinder for a long time, which can easily lead to incomplete recovery and blockage of the filtering functional components, affecting the subsequent oil-gas separation effect; for example, most equipment relies on the circulation pipeline on its outer wall for cooling treatment, and the inner cavity of the equipment, especially the filtering functional components, is in contact with high-temperature oil and gas for a long time (during the compression process, the air will be heated, especially under high pressure and high load conditions, the temperature of the compressed gas may reach a higher level), which can easily cause the temperature of the filtering functional components to remain high, affecting the oil-gas separation efficiency, and seriously affecting the overall performance and service life of the equipment, and needs to be improved. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] Therefore, in order to solve the above technical problems, the present invention provides the following technical solutions: a permanent magnet variable frequency screw air compressor, comprising a compressor body, an oil-gas separation mechanism, an oil scraping mechanism, an oil brushing mechanism and an oil suction mechanism; The compressor body includes a permanent magnet motor, the output shaft of the permanent magnet motor is connected to a screw main unit, the screw main unit is used to compress air, the compressed air output end of the screw main unit is connected to an oil-gas separation mechanism through a pipeline, the compressed gas is separated into oil and gas by the oil-gas separation mechanism, the oil outlet of the oil-gas separation mechanism is connected to the screw main unit through a pipeline, and the lubrication and normal operation of the screw are maintained by the refluxed lubricating oil; the control end of the permanent magnet motor is connected to a controller, and the controller is connected to a frequency converter to achieve precise adjustment of the speed of the permanent magnet motor and energy efficiency optimization; The oil-gas separation mechanism comprises an oil-gas separator, a filter screen cylinder is arranged in the oil-gas separator, a spiral separation blade is arranged in the inner cavity of the filter screen cylinder, the spiral separation blade is fixed on the control shaft, and the control shaft is connected to a rotating motor; The oil scraping mechanism is arranged outside the filter screen cylinder, and the oil scraping mechanism includes a cleaning scraper, and the blade head of the cleaning scraper is arranged closely against the outer wall of the filter screen cylinder; the cleaning scraper is mechanically connected to a ball screw, and the ball screw is mechanically connected to the control shaft through a synchronous wheel and a synchronous belt, so that when the control shaft rotates under the control of the rotating motor, the ball screw is driven to rotate synchronously through the synchronous belt and the synchronous wheel; The oil brushing mechanism comprises a cleaning brush plate, a group of cleaning brush plates are arranged at the upper and lower ends of the cleaning scraper, the cleaning brush plates are rotatably connected to the surface of the cleaning scraper, the cleaning brush plates are annular structures, a worm gear rack group is arranged on the circumferential outer wall of the cleaning brush plate, and a worm is connected to the worm gear through the worm gear rack group, the worm is fixed to the transmission shaft, the end of the transmission shaft is connected to a driven gear, one side of the driven gear is meshed and connected to a vertical rack plate, a driven rack group used in conjunction with the driven gear is arranged on the vertical rack plate, and the vertical rack plate is fixed to one side of the filter screen cylinder; The oil suction mechanism includes an oil suction block, and the cleaning brush plate is fixedly connected to the oil suction block on the side away from the cleaning scraper. An oil pressing seat used in conjunction with the oil suction block is arranged below the filter screen cylinder. When the height of the oil suction block gradually decreases to contact with the oil pressing seat and a certain extrusion force is generated, the oil in the oil suction block is squeezed out by the reaction force of the oil pressing seat.

[0006] As a preferred solution of the permanent magnet variable frequency screw air compressor described in the present invention, the outer sleeve of the oil-gas separator is provided with an insulation layer, a cooling spiral tube is arranged on the inner side of the insulation layer, the cooling spiral tube is connected to an adaptive cooling tube, and the adaptive cooling tube is arranged in the cleaning scraper.

[0007] As a preferred solution of the permanent magnet variable frequency screw air compressor described in the present invention, wherein: the upper and lower ends of the adaptive cooling pipe are respectively arranged with an inner water inlet pipe and an inner water outlet pipe, and the inner water inlet pipe and the inner water outlet pipe are both telescopic tubular structures; the upper and lower ends of the cooling spiral pipe are respectively connected with an outer water inlet pipe and an outer water pipe, and the outer water inlet pipe and the inner water inlet pipe are both connected with a water supply pipe, the water supply pipe is connected to a water supply tank through a water pump, the outer water pipe and the inner water outlet pipe are both connected with a drain pipe, and the drain pipe is connected to a water storage tank.

[0008] As a preferred solution of the permanent magnet variable frequency screw air compressor described in the present invention, the cleaning scraper is made of a heat-conducting material, and heat-conducting ribs used in conjunction with the cleaning scraper are arranged on the outer wall of the filter cylinder. The cleaning scraper is sleeved on the heat-conducting ribs and slidably connected with the heat-conducting ribs up and down to achieve heat conduction, cool the inner cavity components of the oil-gas separator, and improve the oil-gas separation effect.

[0009] As a preferred solution of the permanent magnet variable frequency screw air compressor described in the present invention, cleaning blades are arranged on both the inner and outer sides of the cleaning scraper, and the two groups of cleaning blades are respectively in contact with the outer wall of the filter cylinder and the inner wall of the oil-gas separator, and the inner wall of the oil-gas separator is also made of heat-conducting material.

[0010] As a preferred solution of the permanent magnet variable frequency screw air compressor described in the present invention, an air inlet is arranged on one side of the oil-gas separator, an exhaust port is opened on the top of the oil-gas separator, an oil collecting chamber is arranged at the bottom of the oil-gas separator, and a float for detecting the oil level is arranged inside the oil collecting chamber.

[0011] As a preferred solution of the permanent magnet variable frequency screw air compressor described in the present invention, an oil collecting seat is arranged at the top of the oil collecting chamber, an oil collecting hole for oil liquid to enter is opened on the oil collecting seat, a sensor for detecting the contact of the float is arranged at the bottom of the oil collecting seat, the sensor is connected to a solenoid valve, and the solenoid valve is installed on the oil discharge pipe at the bottom of the oil collecting chamber.

[0012] As a preferred solution of the permanent magnet variable frequency screw air compressor described in the present invention, a horizontal oil scraper is rotatably installed on the top of the oil collecting seat, and the horizontal oil scraper is rotatably installed on the lower rotating shaft. The top of the lower rotating shaft is mechanically connected to the bottom end of the control shaft through a coupling. An oil inlet groove for use with the horizontal oil scraper is provided on the oil collecting seat, and the bottom of the oil inlet groove is connected to the oil collecting chamber, and the length of the oil inlet groove is greater than the length of the horizontal oil scraper.

[0013] As a preferred solution of the permanent magnet variable frequency screw air compressor described in the present invention, the oil absorption block is located on the lower side of the cleaning scraper, the oil absorption block is made of oil absorption material, a plurality of extrusion heads are arranged on the oil pressure seat, the oil pressure seat is slidably connected to a fixed seat up and down, the fixed seat is provided with an oil pressure groove used in conjunction with the oil pressure seat, a spring is arranged in the oil pressure groove, and the two ends of the spring are fixedly connected to the oil pressure seat and the oil pressure groove respectively.

[0014] The present invention also provides a method for using the above-mentioned permanent magnet variable frequency screw air compressor, which comprises the following specific steps: Step 1: Start the controller, which sends a signal to adjust the frequency converter and the speed of the permanent magnet motor. The permanent magnet motor drives the screw main unit through the output shaft. The screw main unit inhales and compresses the air through the relatively rotating screw. The compressed air is output to the oil-gas separation mechanism through the pipeline; Step 2: Compressed air enters the oil-gas separator, and the rotating motor is started, so that the rotating motor drives the spiral separation blade to rotate through the control shaft, generating centrifugal force, and the oil-gas mixture is filtered through the filter cylinder. The centrifugal force further enhances the oil-gas separation efficiency, promotes the oil-liquid separation, and makes the separated air quickly discharged from the top of the oil-gas separator. The separated oil is gathered on the oil collecting seat under the action of gravity, and most of the oil drips into the oil collecting chamber through the oil collecting holes on the oil collecting seat. The remaining oil is scraped off by the horizontal scraper while the control shaft drives the horizontal scraper to rotate, and enters the oil collecting chamber through the oil inlet notch; Step 3: During the cleaning process of the scraper, the cooling pipe is connected to the water source. After the water pump is started, water is transported to the cooling spiral pipe and the adaptive cooling pipe. The cooling water circulates in the cooling spiral pipe and the adaptive cooling pipe to absorb heat, keep the temperature of the oil-gas separator and the filter cylinder within the range required for oil-gas separation, and improve the oil-gas separation effect; Step 4: During the oil-gas separation process, the control shaft is driven by a rotating motor, which drives the synchronous wheel and the synchronous belt to rotate the ball screw. The cleaning scraper automatically slides up and down on the outer wall of the filter screen as the ball screw rotates, thereby scraping off the oil on the outer wall of the filter screen, so that the mesh of the filter screen remains unobstructed; the adaptive cooling pipe cools the cleaning scraper, and the cleaning scraper cools the filter screen by contacting with the heat-conducting ribs, so that the oil-gas separation effect is improved when the oil and gas contact the filter screen; Step 5: The cleaning scraper drives the height of the cleaning brush plate to change synchronously. When the cleaning brush plate moves, the driven gear is connected with the driven rack group through meshing transmission, so that the driven gear rotates, and the driven gear drives the worm to rotate. The worm is connected with the worm gear rack group on the outer wall of the cleaning brush plate through meshing transmission, and drives the cleaning brush plate to rotate on the cleaning scraper, thereby brushing the surface of the filter cylinder to remove excess oil attached to the surface of the filter cylinder and keep the oil-gas separator unobstructed; Step 6: The oil absorption block is responsible for collecting the oil while following the movement of the cleaning scraper. When the oil absorption block descends to contact the oil pressure seat, the spring is compressed, so that the spring exerts a certain squeezing force on the oil absorption block through the oil pressure seat through its own elasticity and reset performance, squeezes out the oil in the oil absorption block, and collects the oil into the oil collecting chamber; Step 7: When the oil in the oil collecting chamber reaches a certain height, the float rises and contacts the sensor. The sensor sends a signal to the controller, which opens the solenoid valve on the oil drain pipe, allowing the oil to flow back to the screw main unit through the oil outlet to achieve lubrication.

[0015] Beneficial effects of the present invention: 1. The present invention combines a permanent magnet motor with a frequency converter, so that the compressor can automatically adjust the speed according to the actual load, greatly improving the energy efficiency. Compared with traditional compressors, it can achieve lower energy consumption; the present invention designs an efficient oil-gas separation mechanism, adopts a filter cylinder filtration and a spiral separation blade structure, which significantly improves the efficiency of oil-gas separation, reduces the loss of lubricating oil, and extends the service life of the equipment.

[0016] 2. The present invention is equipped with oil scraping, oil brushing and oil suction mechanisms to keep the filter cylinder and the inner wall of the oil-gas separator clean, ensure the unobstructed flow of the filter, reduce blockage caused by oil pollution, and effectively avoid performance degradation caused by oil pollution accumulation; through an effective oil collection and reflux mechanism, it ensures that the lubricating oil is recovered to the maximum extent, so that it can be recycled and reused inside the compressor, thereby improving lubrication efficiency, extending the service life of the equipment, and reducing energy consumption and maintenance requirements.

[0017] 3. The cooling mechanism in the system of the present invention circulates cooling water and designs cooling spiral tubes and adaptive cooling tubes, so that the oil-gas separator is always kept in the optimal temperature range during operation, thereby improving the efficiency of oil-gas separation, ensuring stable operation of the equipment, and further improving the oil-gas separation effect and overall operational reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the specific structure of the compressor body of the present invention; Figure 3 It is a schematic diagram of the main structure of the oil-gas separation mechanism of the present invention; Figure 4 It is a cross-sectional structural schematic diagram of the oil-gas separator of the present invention; Figure 5 It is a schematic cross-sectional structural diagram of the oil collecting chamber of the present invention; Figure 6 It is a schematic diagram of the internal structure of the oil-gas separator of the present invention; Figure 7 For the present invention Figure 6 A schematic diagram of a top view structure; Figure 8 For the present invention Figure 7 A schematic diagram of the partially enlarged structure; Fig. 9 It is a schematic cross-sectional structural diagram of the cleaning scraper of the present invention.

[0019] In the figure: 100, compressor body; 101, permanent magnet motor; 102, screw main unit; 103, inverter; 200, oil-gas separation mechanism; 201, oil-gas separator; 202, filter screen; 203, spiral separation blade; 204, control shaft; 205, rotating motor; 206, insulation layer; 207, cooling spiral tube; 2071, external water inlet pipe; 2072, external water outlet pipe; 208, adaptive cooling pipe; 2081, internal water inlet pipe; 2082, internal water outlet pipe; 209, heat-conducting ribs; 210, water supply pipe; 211, drainage pipe; 212, water storage tank; 213, oil collecting chamber; 214, float; 215, water pump; 300, oil scraping mechanism; 301, cleaning scraper; 302, synchronous wheel; 303, ball screw; 304, synchronous belt; 305, cleaning blade; 306, oil collecting seat; 307, oil collecting hole; 308, sensor; 309, oil drain pipe; 310, horizontal oil scraper; 311, oil inlet slot; 400, oil brushing mechanism; 401, cleaning brush plate; 402, worm gear rack assembly; 403, worm; 404, transmission shaft; 405, driven gear; 406, vertical rack plate; 407, driven rack assembly; 500, oil suction mechanism; 501, oil suction block; 502, oil pressure seat; 503, spring; 504, fixed seat. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0023] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0024] Reference Figures 1 to 9 , which is an embodiment of the present invention, provides a permanent magnet variable frequency screw air compressor and a method of using the same, comprising a compressor body 100, an oil-gas separation mechanism 200, an oil scraping mechanism 300, an oil brushing mechanism 400 and an oil suction mechanism 500; The compressor body 100 includes a permanent magnet motor 101, the output shaft of the permanent magnet motor 101 is connected to a screw main unit 102, the screw main unit 102 is used to compress air, the compressed air output end of the screw main unit 102 is connected to an oil-gas separation mechanism 200 through a pipeline, the compressed gas is separated into oil and gas by the oil-gas separation mechanism 200, the oil outlet of the oil-gas separation mechanism 200 is connected to the screw main unit 102 through a pipeline, and the lubrication and normal operation of the screw are maintained by the refluxed lubricating oil; the control end of the permanent magnet motor 101 is connected to a controller, and the controller is connected to a frequency converter 103, so as to achieve precise adjustment of the rotation speed of the permanent magnet motor 101 and optimize energy efficiency; The oil-gas separation mechanism 200 includes an oil-gas separator 201, a filter screen cylinder 202 is arranged in the oil-gas separator 201, a spiral separation blade 203 is arranged in the inner cavity of the filter screen cylinder 202, and the spiral separation blade 203 is fixed on the control shaft 204, and the control shaft 204 is connected to a rotating motor 205; the outer sleeve of the oil-gas separator 201 is provided with a heat preservation layer 206, and a cooling spiral tube 207 is arranged on the inner side of the heat preservation layer 206, and the cooling spiral tube 207 is connected to an adaptive cooling tube 208, and the adaptive cooling tube 208 is arranged in the cleaning scraper 301; the upper and lower ends of the adaptive cooling tube 208 are respectively arranged with an inner water inlet pipe 2081 and an inner water outlet pipe 2082, and the inner water inlet pipe 2081 and the inner water outlet pipe 2082 are both telescopic tubular structures; the upper and lower ends of the cooling spiral tube 207 An external water inlet pipe 2071 and an external water outlet pipe 2072 are respectively connected, and the external water inlet pipe 2071 and the internal water inlet pipe 2081 are both connected to a water supply pipe 210, and the water supply pipe 210 is connected to a water supply tank through a water pump 215, and the external water pipe 2072 and the internal water outlet pipe 2082 are both connected to a drain pipe 211, and the drain pipe 211 is connected to a water storage tank 212; an air inlet is arranged on one side of the oil-gas separator 201, an exhaust port is opened at the top of the oil-gas separator 201, an oil collecting chamber 213 is arranged at the bottom of the oil-gas separator 201, and a float 214 for detecting the oil level is arranged inside the oil collecting chamber 213; a sensor 308 for detecting the contact of the float 214 is arranged at the bottom of the oil collecting seat 306, and the sensor 308 is connected to a solenoid valve, and the solenoid valve is installed on the oil discharge pipe 309 at the bottom of the oil collecting chamber 213.

[0025] The oil scraping mechanism 300 is arranged outside the filter screen cylinder 202, and the oil scraping mechanism 300 includes a cleaning scraper 301, and the blade head of the cleaning scraper 301 is arranged close to the outer wall of the filter screen cylinder 202; the cleaning scraper 301 is mechanically connected to a ball screw 303, and the ball screw 303 is mechanically connected to the control shaft 204 through a synchronous wheel 302 and a synchronous belt 304, so that when the control shaft 204 rotates under the control of the rotating motor 205, the ball screw 303 is driven to rotate synchronously through the synchronous belt 304 and the synchronous wheel 302; the cleaning scraper 301 is made of heat-conducting material, and heat-conducting ribs 209 used in conjunction with the cleaning scraper 301 are arranged on the outer wall of the filter screen cylinder 202, and the cleaning scraper 301 is sleeved on the heat-conducting ribs 209 and connected to the heat-conducting ribs 209 by sliding up and down, so as to realize heat conduction, which plays a role in the inner cavity components of the oil-gas separator 201 The cooling effect improves the oil-gas separation effect; cleaning blades 305 are arranged on both the inner and outer sides of the cleaning scraper 301, and the two groups of cleaning blades 305 are respectively in contact with the outer wall of the filter screen cylinder 202 and the inner wall of the oil-gas separator 201, and the inner wall of the oil-gas separator 201 is also made of heat-conducting material; an oil collecting seat 306 is arranged at the top of the oil collecting chamber 213, and an oil collecting hole 307 for oil liquid to enter is provided on the oil collecting seat 306; a horizontal oil scraper 310 is rotatably installed on the top of the oil collecting seat 306, and the horizontal oil scraper 310 is rotatably installed on the lower rotating shaft, and the top of the lower rotating shaft is mechanically connected to the bottom end of the control shaft 204 through a coupling, and an oil inlet slot 311 used in conjunction with the horizontal oil scraper 310 is provided on the oil collecting seat 306, and the bottom of the oil inlet slot 311 is connected to the oil collecting chamber 213, and the length of the oil inlet slot 311 is greater than the length of the horizontal oil scraper 310.

[0026] The oil brushing mechanism 400 includes a cleaning brush plate 401, a group of cleaning brush plates 401 are arranged at the upper and lower ends of the cleaning scraper 301, the cleaning brush plates 401 are rotatably connected to the surface of the cleaning scraper 301, the cleaning brush plates 401 are annular structures, a worm gear rack group 402 is arranged on the circumferential outer wall of the cleaning brush plate 401, and a worm 403 is connected to the worm gear rack group 402 through meshing transmission, the worm 403 is fixed on the transmission shaft 404, the end of the transmission shaft 404 is connected to a driven gear 405, one side of the driven gear 405 is meshingly connected to a vertical rack plate 406, a driven rack group 407 used in conjunction with the driven gear 405 is arranged on the vertical rack plate 406, and the vertical rack plate 406 is fixed to one side of the filter screen cylinder 202; The oil suction mechanism 500 includes an oil suction block 501, and the side of the cleaning brush plate 401 away from the cleaning scraper 301 is fixedly connected with the oil suction block 501, and an oil pressure seat 502 used in conjunction with the oil suction block 501 is arranged below the filter screen cylinder 202. When the height of the oil suction block 501 gradually decreases to contact with the oil pressure seat 502 and generates a certain extrusion force, the oil in the oil suction block 501 is squeezed out by the reaction force of the oil pressure seat 502; the oil suction block 501 is located on the lower side of the cleaning scraper 301, the oil suction block 501 is made of oil-absorbing material, and a plurality of extrusion heads are arranged on the oil pressure seat 502. The oil pressure seat 502 is slidably connected to a fixed seat 504 up and down, and the fixed seat 504 is fixed above the oil collecting seat 306. A spring 503 is arranged on the fixed seat 504, and the two ends of the spring 503 are respectively fixedly connected to the oil pressure seat 502 and the oil pressure groove.

[0027] The present invention also provides a method for using the above-mentioned permanent magnet variable frequency screw air compressor, which comprises the following specific steps: Step 1: Start the controller, the controller sends a signal to adjust the frequency converter 103, adjust the speed of the permanent magnet motor 101, the permanent magnet motor 101 drives the screw main unit 102 through the output shaft, the screw main unit 102 inhales and compresses the air through the relatively rotating screw, and the compressed air is output to the oil-gas separation mechanism 200 through the pipeline; Step 2: Compressed air enters the oil-gas separator 201, and the rotating motor 205 is started, so that the rotating motor 205 drives the spiral separation blade 203 to rotate through the control shaft 204, generating centrifugal force, and the oil-gas mixture is filtered through the filter cylinder 202. The centrifugal force further enhances the oil-gas separation efficiency, promotes the oil-liquid separation, and makes the separated air quickly discharged from the top of the oil-gas separator 201. The separated oil-liquid gathers on the oil collecting seat 306 under the action of gravity, and most of the oil drips into the oil collecting chamber 213 through the oil collecting holes 307 on the oil collecting seat 306. The remaining oil is scraped off by the horizontal oil scraper 310 while the control shaft 204 drives the horizontal oil scraper 310 to rotate, and enters the oil collecting chamber 213 through the oil inlet slot 311; Step 3: During the operation of the cleaning scraper 301, the cooling pipe is connected to the water source. After the water pump 215 is started, water is transported to the cooling spiral pipe 207 and the adaptive cooling pipe 208. The cooling water circulates in the cooling spiral pipe 207 and the adaptive cooling pipe 208 to absorb heat, thereby maintaining the temperature of the oil-gas separator 201 and the filter cylinder 202 within the range required for oil-gas separation, thereby improving the oil-gas separation effect. Step 4: During the oil-gas separation process, the control shaft 204 is driven by the rotating motor 205, driving the synchronous wheel 302 and the synchronous belt 304 to rotate the ball screw 303. The cleaning scraper 301 automatically slides up and down on the outer wall of the filter screen cylinder 202 as the ball screw 303 rotates, thereby scraping off the oil on the outer wall of the filter screen cylinder 202, so that the mesh of the filter screen cylinder 202 remains unobstructed; the adaptive cooling pipe 208 cools the cleaning scraper 301, and the cleaning scraper 301 cools the filter screen cylinder 202 by contacting with the heat-conducting ribs 209, so that the oil-gas separation effect is improved when the oil and gas contact the filter screen cylinder 202; Step 5: The cleaning scraper 301 drives the height of the cleaning brush plate 401 to change synchronously. When the cleaning brush plate 401 moves, the driven gear 405 is connected to the driven rack group 407 through meshing transmission, so that the driven gear 405 rotates, and the driven gear 405 drives the worm 403 to rotate. The worm 403 is connected to the worm gear rack group 402 on the outer wall of the cleaning brush plate 401 through meshing transmission, and drives the cleaning brush plate 401 to rotate on the cleaning scraper 301, thereby brushing the surface of the filter screen cylinder 202 to remove excess oil attached to the surface of the filter screen cylinder 202 and keep the oil-gas separator 201 unobstructed; Step 6: The oil absorption block 501 is responsible for collecting the oil while following the movement of the cleaning scraper 301. When the oil absorption block 501 descends to contact the oil pressing seat 502, the spring 503 is compressed, so that the spring 503 exerts a certain squeezing force on the oil absorption block 501 through the oil pressing seat 502 through its own elasticity and reset performance, squeezes out the oil in the oil absorption block 501, and collects the oil in the oil collecting chamber 213; Step 7: When the oil in the oil collecting chamber 213 reaches a certain height, the float 214 rises and contacts the sensor 308. The sensor 308 sends a signal to the controller, and the controller controls the opening of the solenoid valve on the oil drain pipe 309, so that the oil flows back to the screw main unit 102 through the oil outlet to achieve lubrication.

[0028] The permanent magnet variable frequency screw air compressor of the present invention realizes precise regulation of the motor speed by combining the efficient permanent magnet motor 101 and the frequency converter 103, significantly improving energy efficiency and reducing energy consumption. Its innovative oil-gas separation mechanism 200 uses a filter screen cylinder 202 and a spiral separation blade 203, which greatly improves the oil-gas separation efficiency, reduces lubricating oil loss, and extends the service life of the equipment. In addition, the configured oil scraping mechanism 300, oil brushing mechanism 400 and oil suction mechanism 500 ensure the smooth flow of the filter screen cylinder 202, reduce the risk of oil blockage, and improve the stability and operation efficiency of the equipment. The unique cooling mechanism keeps the oil-gas separator 201 in the optimal temperature range at all times through the circulation of cooling water, further optimizes the oil-gas separation effect, and ensures the reliability and efficient operation of the overall system.

[0029] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A permanent magnet variable frequency screw air compressor, characterized in that: It comprises a compressor body (100), an oil-gas separation mechanism (200), an oil scraping mechanism (300), an oil brushing mechanism (400) and an oil suction mechanism (500); The compressor body (100) comprises a permanent magnet motor (101); the output shaft of the permanent magnet motor (101) is connected to a screw main unit (102); the screw main unit (102) is used to compress air; the compressed air output end of the screw main unit (102) is connected to an oil-gas separation mechanism (200) via a pipeline; the compressed gas is separated into oil and gas by the oil-gas separation mechanism (200); the oil outlet of the oil-gas separation mechanism (200) is connected to the screw main unit (102) via a pipeline; the lubrication and normal operation of the screw are maintained by the refluxed lubricating oil; the control end of the permanent magnet motor (101) is connected to a controller; the controller is connected to a frequency converter (103) to achieve precise adjustment of the rotation speed of the permanent magnet motor (101) and energy efficiency optimization; The oil-gas separation mechanism (200) comprises an oil-gas separator (201), a filter cylinder (202) is arranged in the oil-gas separator (201), a spiral separation blade (203) is arranged in the inner cavity of the filter cylinder (202), the spiral separation blade (203) is fixed on a control shaft (204), and the control shaft (204) is connected to a rotating motor (205); The oil scraping mechanism (300) is arranged outside the filter screen cylinder (202), and comprises a cleaning scraper (301), the blade of the cleaning scraper (301) being arranged in close contact with the outer wall of the filter screen cylinder (202); the cleaning scraper (301) is mechanically connected to a ball screw (303), and the ball screw (303) is mechanically connected to the control shaft (204) via a synchronous wheel (302) and a synchronous belt (304), so that when the control shaft (204) rotates under the control of the rotating motor (205), the ball screw (303) is driven to rotate synchronously via the synchronous belt (304) and the synchronous wheel (302); The oil brushing mechanism (400) comprises a cleaning brush plate (401), a group of cleaning brush plates (401) are arranged at the upper and lower ends of the cleaning scraper (301), the cleaning brush plates (401) are rotatably connected to the surface of the cleaning scraper (301), the cleaning brush plates (401) are annular structures, a worm gear rack group (402) is arranged on the circumferential outer wall of the cleaning brush plate (401), and a worm (403) is connected to the worm gear rack group (402) through meshing transmission, the worm (403) is fixed to the transmission shaft (404), the end of the transmission shaft (404) is connected to a driven gear (405), one side of the driven gear (405) is meshingly connected to a vertical rack plate (406), a driven rack group (407) used in conjunction with the driven gear (405) is arranged on the vertical rack plate (406), and the vertical rack plate (406) is fixed to one side of the filter screen cylinder (202); The oil suction mechanism (500) comprises an oil suction block (501), and the oil suction block (501) is fixedly connected to the side of the cleaning brush plate (401) away from the cleaning scraper (301). An oil pressing seat (502) used in conjunction with the oil suction block (501) is arranged below the filter screen cylinder (202). When the height of the oil suction block (501) gradually decreases until it contacts the oil pressing seat (502) and generates a certain extrusion force, the oil in the oil suction block (501) is squeezed out by the reaction force of the oil pressing seat (502).

2. The permanent magnet variable frequency screw air compressor according to claim 1, characterized in that: The oil-gas separator (201) is externally sheathed with a heat-insulating layer (206), a cooling spiral tube (207) is arranged inside the heat-insulating layer (206), the cooling spiral tube (207) is connected to an adaptive cooling tube (208), and the adaptive cooling tube (208) is arranged inside the cleaning scraper (301).

3. The permanent magnet variable frequency screw air compressor according to claim 2, characterized in that: An inner water inlet pipe (2081) and an inner water outlet pipe (2082) are arranged at the upper and lower ends of the adaptive cooling pipe (208), and both the inner water inlet pipe (2081) and the inner water outlet pipe (2082) are telescopic tubular structures; an outer water inlet pipe (2071) and an outer water outlet pipe (2072) are connected to the upper and lower ends of the cooling spiral pipe (207), and both the outer water inlet pipe (2071) and the inner water inlet pipe (2081) are connected to a water supply pipe (210), and the water supply pipe (210) is connected to a water supply tank via a water pump (215), and both the outer water outlet pipe (2072) and the inner water outlet pipe (2082) are connected to a drainage pipe (211), and the drainage pipe (211) is connected to a water storage tank (212).

4. The permanent magnet variable frequency screw air compressor according to claim 3, characterized in that: The cleaning scraper (301) is made of a heat-conducting material. A heat-conducting rib (209) for use with the cleaning scraper (301) is arranged on the outer wall of the filter screen cylinder (202). The cleaning scraper (301) is sleeved on the heat-conducting rib (209) and is slidably connected to the heat-conducting rib (209) up and down, thereby achieving heat conduction, cooling the inner cavity components of the oil-gas separator (201), and improving the oil-gas separation effect.

5. The permanent magnet variable frequency screw air compressor according to claim 4, characterized in that: Cleaning blades (305) are arranged on both the inner and outer sides of the cleaning scraper (301), and the two groups of cleaning blades (305) are in contact with the outer wall of the filter screen cylinder (202) and the inner wall of the oil-gas separator (201) respectively, and the inner wall of the oil-gas separator (201) is also made of heat-conducting material.

6. The permanent magnet variable frequency screw air compressor according to claim 5, characterized in that: An air inlet is arranged on one side of the oil-gas separator (201), an air outlet is opened at the top of the oil-gas separator (201), an oil collecting chamber (213) is arranged at the bottom of the oil-gas separator (201), and a float (214) for detecting the oil level is arranged inside the oil collecting chamber (213).

7. The permanent magnet variable frequency screw air compressor according to claim 6, characterized in that: An oil collecting seat (306) is arranged at the top of the oil collecting chamber (213), and an oil collecting hole (307) for oil liquid to enter is provided on the oil collecting seat (306). A sensor (308) for detecting contact of the floating ball (214) is arranged at the bottom of the oil collecting seat (306), and the sensor (308) is connected to a solenoid valve, which is installed on an oil discharge pipe (309) at the bottom of the oil collecting chamber (213).

8. The permanent magnet variable frequency screw air compressor according to claim 7, characterized in that: A horizontal oil scraper (310) is rotatably mounted on the top of the oil collecting seat (306); the horizontal oil scraper (310) is rotatably mounted on the lower rotating shaft; the top of the lower rotating shaft is mechanically connected to the bottom of the control shaft (204) via a coupling; an oil inlet slot (311) for use with the horizontal oil scraper (310) is provided on the oil collecting seat (306); the bottom of the oil inlet slot (311) is communicated with the oil collecting chamber (213); and the length of the oil inlet slot (311) is greater than the length of the horizontal oil scraper (310).

9. The permanent magnet variable frequency screw air compressor according to claim 8, characterized in that: The oil absorption block (501) is located at the lower side of the cleaning scraper (301). The oil absorption block (501) is made of oil absorption material. A plurality of extrusion heads are arranged on the oil pressing seat (502). The oil pressing seat (502) is slidably connected to a fixed seat (504) up and down. The fixed seat (504) is fixed above the oil collecting seat (306). A spring (503) is arranged on the fixed seat (504). The two ends of the spring (503) are respectively fixedly connected to the oil pressing seat (502) and the oil pressing groove.

10. A method for using the permanent magnet variable frequency screw air compressor according to any one of claims 1 to 9, characterized in that: It includes the following specific steps: Step 1: starting the controller, the controller sends a signal to adjust the frequency converter (103), adjusts the speed of the permanent magnet motor (101), the permanent magnet motor (101) drives the screw main unit (102) through the output shaft, the screw main unit (102) inhales and compresses air through the relatively rotating screw, and the compressed air is output to the oil-gas separation mechanism (200) through the pipeline; Step 2: compressed air enters the oil-gas separator (201), and the rotating motor (205) is started, so that the rotating motor (205) drives the spiral separation blade (203) to rotate through the control shaft (204), thereby generating centrifugal force. The oil-gas mixture is filtered through the filter screen (202), and the oil-gas separation efficiency is further enhanced by the centrifugal force, so that the oil-liquid separation is promoted, so that the separated air is quickly discharged from the top of the oil-gas separator (201), and the separated oil-liquid is gathered on the oil collecting seat (306) under the action of gravity, and most of the oil drips into the oil collecting chamber (213) through the oil collecting holes (307) on the oil collecting seat (306). The remaining oil is scraped off by the horizontal oil scraper (310) while the control shaft (204) drives the horizontal oil scraper (310) to rotate, and enters the oil collecting chamber (213) through the oil inlet notch (311); Step 3: During the operation of the cleaning scraper (301), the cooling pipe is connected to a water source, and after the water pump (215) is started, water is transported to the cooling spiral pipe (207) and the adaptive cooling pipe (208). The cooling water circulates in the cooling spiral pipe (207) and the adaptive cooling pipe (208) to absorb heat, thereby maintaining the temperature of the oil-gas separator (201) and the filter screen cylinder (202) within the range required for oil-gas separation, thereby improving the oil-gas separation effect; Step 4: During the oil-gas separation process, the control shaft (204) is driven by the rotating motor (205), driving the synchronous wheel (302) and the synchronous belt (304) to rotate the ball screw (303). The cleaning scraper (301) automatically slides up and down on the outer wall of the filter screen cylinder (202) as the ball screw (303) rotates, thereby scraping off the oil on the outer wall of the filter screen cylinder (202), so that the mesh of the filter screen cylinder (202) remains unobstructed; the adaptive cooling pipe (208) cools the cleaning scraper (301), and the cleaning scraper (301) cools the filter screen cylinder (202) by contacting the heat-conducting ribs (209), so that the oil-gas separation effect is improved when the oil and gas contact the filter screen cylinder (202); Step 5: The cleaning scraper (301) drives the height of the cleaning brush plate (401) to change synchronously. When the cleaning brush plate (401) moves, the driven gear (405) is connected to the driven rack group (407) through meshing transmission, so that the driven gear (405) rotates. The driven gear (405) drives the worm (403) to rotate. The worm (403) is connected to the worm gear rack group (402) on the outer wall of the cleaning brush plate (401) through meshing transmission, so as to drive the cleaning brush plate (401) to rotate on the cleaning scraper (301), thereby brushing the surface of the filter screen cylinder (202) to remove excess oil attached to the surface of the filter screen cylinder (202) and keep the oil-gas separator (201) unobstructed; Step 6: The oil absorption block (501) is responsible for collecting the oil while following the movement of the cleaning scraper (301). When the oil absorption block (501) descends to contact the oil pressure seat (502), the spring (503) is compressed, so that the spring (503) exerts a certain extrusion force on the oil absorption block (501) through the oil pressure seat (502) through its own elasticity and reset performance, squeezes out the oil in the oil absorption block (501), and collects the oil in the oil collecting chamber (213); Step 7: When the oil in the oil collecting chamber (213) reaches a certain height, the float (214) rises and contacts the sensor (308). The sensor (308) sends a signal to the controller, and the controller controls the opening of the solenoid valve on the oil discharge pipe (309), so that the oil flows back to the screw main unit (102) through the oil outlet to achieve lubrication.

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