A screw type air compression device

Abstract

The present invention belongs to the technical field of screw-type air compression devices, and specifically is a screw-type air compression device, comprising an outer shell, an air compression box is fixedly installed in the outer shell, two groups of air compression screws meshing with each other are rotatably installed in the air compression box, an air outlet end of the air compression box is connected to an air supply pipe, one end of the air supply pipe is connected to a heat conducting plate, a fan is installed on one side of the heat conducting plate, and the lower end of the heat conducting plate is connected to an exhaust pipe, an air volume detector is installed at the end of the exhaust pipe, gears are fixedly mounted on the ends of the two groups of air compression screws, the two groups of gears mesh with each other, an air inlet end of the air compression box is connected to an air inlet pipe, an air filtering mechanism is arranged at one end of the air inlet pipe, and in the process of driving a conversion disk, not only the replacement of the air filter is realized, but also the used air filter is discharged from the external box and the unused air filter is added to the external box, so that it is more convenient for staff to take and put the air filter, and indirectly improves the cleaning efficiency of the air filter by the staff.

Description

Technical Field

[0001] The invention belongs to the technical field of screw type air compression devices, in particular to a screw type air compression device. Background Art

[0002] Screw air compressor is a widely used compression equipment. It compresses air through a pair of internal meshing spiral rotors (male screw and female screw), converting mechanical energy into gas pressure energy. Screw air compressor mainly consists of air compression mechanism, air filtration mechanism, temperature control mechanism and other structures.

[0003] The patent with publication number CN117703757A discloses a direct-drive variable frequency screw air compressor, comprising a body, an air compression mechanism arranged in the body, the air compression mechanism connected to an auxiliary mechanism, the auxiliary mechanism comprising an air volume detector and a plurality of first limit air guide frames, an air filter is mounted on the first limit air guide frame, a slide is arranged between two groups of air filters, a plurality of baffle plates are slidably fitted on the slide, the baffle plates on both sides are respectively opposite to the air inlet channels at the air inlet end of the air compressor cylinder on both sides, the scheme detects the air volume of the air compressor cylinder through the air volume detector, determines whether the air filter in use needs to be replaced, and then drives the linkage gear to rotate, the linkage gear drives the racks on both sides to move in the opposite direction, realizes the switching of the two channels in the ventilation pipe, realizes the conversion of the use of the air inlet channel, and ensures the stable operation of the air compressor.

[0004] In the above scheme, when the use of the air intake channel is switched, the two sets of air filters are also switched. In order not to affect the next switch of the air intake channel, the staff must clean the replaced air filters in time, and the staff cannot determine the next time to replace the air filters, resulting in a relatively tight time for the staff to clean the air filters, which easily leads to unclean cleaning of the air filters. Secondly, the air filters are installed inside the machine body, and the air filters are lifted up by a lifting arm to achieve disassembly of the air filters, which makes it troublesome for the staff to take and put the air filters, affecting the efficiency of the staff in replacing and cleaning the air filters. For this reason, the present invention provides a screw air compression device. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a screw-type air compression device described in the present invention comprises an outer shell, an air compression box is fixedly installed in the outer shell, two groups of air compression screws meshing with each other are rotatably installed in the air compression box, an air outlet end of the air compression box is connected to an air supply pipe, one end of the air supply pipe is connected to a heat conducting plate, a fan is installed on one side of the heat conducting plate, and the lower end of the heat conducting plate is connected to an exhaust pipe, an air volume detector is installed at the end of the exhaust pipe, the ends of the two groups of air compression screws are fixedly sleeved with gears, the two groups of gears mesh with each other, the air inlet end of the air compression box is connected to the air inlet pipe, an air filter mechanism is arranged at one end of the air inlet pipe, the air filter mechanism comprises an external hanging box, the external hanging box is fixedly connected to one end of the outer shell, a conversion disk rotatably installed in the external hanging box, nine groups of conversion slots for placing air filters are opened at equal angles on the conversion disk, a filter element is arranged in the air filter, a storage pipe for storing the air filter is arranged on the external hanging box, vents are symmetrically opened on both sides of the external hanging box, one end of the air inlet pipe is connected to a group of vents, and a feeding port is opened at the bottom of the external hanging box;

[0007] Multiple sets of air filters can be placed in the storage tube at one time, giving the staff sufficient time to clean the air filters, so that the staff can clean the air filters more thoroughly. Secondly, during the driving of the conversion disk, not only the air filter can be replaced, but also the used air filter can be discharged from the external box and the unused air filter can be added to the external box, making it more convenient for the staff to take and place the air filter, indirectly improving the staff's efficiency in cleaning the air filter.

[0008] Preferably, a sealing rubber pad is fixedly installed at both ends of the air filter, the sealing rubber pad is attached to the inner wall of the external box, and an arc-shaped plate for squeezing the sealing rubber pad is fixedly installed on both sides of the external box, and a first inverted slope is provided at both ends of the arc-shaped plate, and the vent is located on the arc-shaped plate;

[0009] The sealing gasket is squeezed by the first inverted slope, causing the sealing gasket to deform until the sealing gasket is completely offset from the first inverted slope. At the same time, the new air filter is located between the two sets of vents. At this time, the deformed sealing gasket will produce a rebound force, causing the sealing gasket to fit tightly against the arc plate, ensuring the sealing between the end of the air filter and the arc plate.

[0010] Preferably, a sealing mechanism is fixedly installed at both ends of the air filter, the sealing mechanism comprising an inner ring, the inner ring is fixedly connected to the end of the air filter, an outer ring sleeved on the inner ring, the outer ring is tightly against the end of the air filter, a rubber pad arranged between the outer ring and the inner ring, a cylinder body arranged in the inner ring, a piston head movably plugged in the cylinder body, six groups of connecting pipes distributed at equal angles between the cylinder body and the inner ring, one end of the connecting pipe is fixedly connected to the outer ring of the cylinder body, and the connecting pipe is connected to the inside of the cylinder body, an annular cavity is arranged in the rubber pad, the other end of the connecting pipe passes through the annular cavity and is fixedly connected to the inner ring of the outer ring, a sealing sleeve is sleeved on the piston head, the outer ring of the sealing sleeve is tightly against the inner wall of the cylinder body, two groups of guide grooves are opened on both sides of the external hanging box, the end of the piston head is located in the guide groove, the guide groove is composed of an arc groove and a straight groove, one end of the arc groove is connected to the straight groove, the other end of a group of arc grooves is provided with a second inverted slope for pushing the end of the piston head, and a plurality of groups of openings are opened on the other end of the connecting pipe;

[0011] Specifically, when the sealing gasket is squeezed by the first inverted slope, the contact area between the first inverted slope and the sealing gasket is limited, so that the sealing gasket in motion is subjected to great friction by the arc plate. The greater friction will accelerate the wear of the sealing gasket, thereby reducing the service life of the sealing gasket.

[0012] The end of the piston head will be squeezed by the second inverted slope at the other end of the arc groove, so that the piston head and the sealing sleeve slide along the inner cavity of the cylinder body. At the same time, the air in the inner cavity of the cylinder body is pressed into the six groups of connecting pipes. Then the air in the connecting pipes enters the annular cavity of the rubber pad through the opening, causing the rubber pad to expand until the end of the piston head is offset from the second inverted slope. The expanded rubber pad will fit tightly against the inner wall of the external box, thereby ensuring the sealing between the end of the air filter and the inner wall of the external box. At the same time, the rubber pad will not be subjected to excessive friction, which reduces the wear of the rubber pad and thus increases the service life of the rubber pad.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. Multiple sets of air filters can be placed in the storage tube at one time, giving the staff enough time to clean the air filters, so that the staff can clean the air filters more thoroughly. Secondly, during the driving of the conversion disk, not only the air filter can be replaced, but also the used air filter can be discharged from the external box and the unused air filter can be added to the external box, making it more convenient for the staff to take and put the air filter, indirectly improving the staff's efficiency in replacing and cleaning the air filter.

[0015] 2. When the new air filter is rotated between the two sets of vents, the sealing pads at both ends of the air filter will first slide against the inner wall of the external box, and then the sealing pads will contact the first inverted slope at the end of the arc plate. The sealing pad will be squeezed by the first inverted slope, causing the sealing pad to deform until the sealing pad is completely offset from the first inverted slope. At the same time, the new air filter is located between the two sets of vents. At this time, the deformed sealing pad will produce a rebound force, causing the sealing pad to fit tightly against the arc plate, ensuring the sealing between the end of the air filter and the arc plate.

[0016] 3. When the air filter rotates with the conversion disk, the rubber pad on the sealing mechanism will slide against the inner wall of the external box, and the end of the piston head will slide along the arc groove. When the end of the piston head slides to the other end of the arc groove, the end of the piston head will be squeezed by the second inverted slope at the other end of the arc groove, so that the piston head and the sealing sleeve slide along the inner cavity of the cylinder body. At the same time, the air in the cylinder body cavity is pressed into the six groups of connecting pipes. Then the air in the connecting pipe enters the annular cavity of the rubber pad through the opening, so that the rubber pad expands until the end of the piston head is offset from the second inverted slope. The expanded rubber pad will be close to the inner wall of the external box, thereby ensuring the sealing between the end of the air filter and the inner wall of the external box. At the same time, the rubber pad will not be subjected to excessive friction, which reduces the wear of the rubber pad and thus increases the service life of the rubber pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the structure of the present invention.

[0019] Figure 2 It is a partial cross-sectional schematic diagram of the structure of the present invention.

[0020] Figure 3 It is a schematic diagram of the combination of the air intake pipe and the cross-sectional air filtering mechanism of the present invention.

[0021] Figure 4 The figure is a schematic diagram of the cross-section of the external box, the conversion plate, the air filter, the vent, the sealing gasket and the arc plate assembly of the present invention.

[0022] Figure 5 It is a schematic diagram of the cross-section of the external box, the conversion plate, the air filter, the guide groove and the sealing mechanism assembly of the present invention.

[0023] Figure 6 It is a schematic diagram of the combination of the air filter and the sealing mechanism of the present invention.

[0024] Figure 7 It is a schematic diagram of the sealing mechanism of the present invention in cross section.

[0025] Figure 8 It is a schematic diagram of the connecting pipe of the present invention.

[0026] In the figure: 1, outer shell; 2, air compressor box; 3, air compressor screw; 4, air supply pipe; 5, heat conducting plate; 6, fan; 7, exhaust pipe; 8, air volume detector; 9, gear; 10, air intake pipe; 11, air filter mechanism; 111, external box; 112, conversion plate; 113, conversion slot; 114, air filter; 41, filter element; 115, storage pipe; 116, vent; 117, sealing pad ; 118, arc plate; 81, first inverted slope; 119, guide groove; 91, arc groove; 92, straight groove; 93, second inverted slope; 121, sealing mechanism; 122, feed port; 1211, inner ring; 1212, outer ring; 1213, rubber pad; 131, annular cavity; 1214, cylinder body; 1215, connecting pipe; 151, opening; 1216, piston head; 161, sealing sleeve. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods. Embodiment 1

[0028] like Figures 1 to 4 As shown, a screw-type air compression device according to an embodiment of the present invention comprises an outer shell 1, an air compression box 2 is fixedly installed in the outer shell 1, two groups of air compression screws 3 meshing with each other are rotatably installed in the air compression box 2, an air outlet end of the air compression box 2 is connected to an air supply pipe 4, one end of the air supply pipe 4 is connected to a heat conducting plate 5, a fan 6 is installed on one side of the heat conducting plate 5, and the lower end of the heat conducting plate 5 is connected to an exhaust pipe 7, an air volume detector 8 is installed at the end of the exhaust pipe 7, gears 9 are fixedly mounted on the ends of the two groups of air compression screws 3, the two groups of gears 9 mesh with each other, an air inlet end of the air compression box 2 is connected to an air inlet pipe 10, and the air inlet pipe 11 is connected to the exhaust pipe 7. An air filtering mechanism 11 is provided at one end of 10, and the air filtering mechanism 11 includes an external box 111, the external box 111 is fixedly connected to one end of the outer shell 1, and a conversion disk 112 is rotatably installed in the external box 111. Nine groups of conversion slots 113 for placing an air filter 114 are provided at equal angles on the conversion disk 112. A filter element 41 is provided in the air filter 114, and a storage tube 115 for storing the air filter 114 is provided on the external box 111. Ventilation holes 116 are symmetrically provided on both sides of the external box 111, one end of the air inlet pipe 10 is connected to a group of ventilation holes 116, and a discharge port 122 is provided at the bottom of the external box 111.

[0029] Specifically, the filter element 41 is made of non-woven fabric, the heat conducting sheet 5, the air volume detector 8, and the fan 6 are made of the corresponding mechanism in the direct-drive variable frequency screw air compressor of the above-mentioned publication number CN117703757A. In the initial state, a group of air filters 114 is located between the two groups of vents 116, and one end of the air inlet pipe 10 is facing the group of air filters 114. When it is necessary to compress the air, a group of air compression screws 3 is driven by a motor to rotate, and the group of air compression screws 3 drives the corresponding gears 9 to rotate. At the same time, the other group of air compression screws 3 is rotated through the meshing transmission of the two groups of gears 9. As the two groups of air compression screws 3 continue to rotate, the outside air passes through the vents. 116 enters the air filter 114, and the air is filtered by the filter element 41 inside the air filter 114. The filtered air enters the air compression box 2 through the air intake pipe 10, and then the air is compressed by two sets of air compression screws 3. The compressed air enters the heat conducting plate 5 through the air supply pipe 4, and the fan 6 is started at the same time. The fan 6 accelerates the air flow inside the outer shell 1, and the compressed air is cooled by the heat conducting plate 5. The gas after heat dissipation and cooling is discharged through the exhaust pipe 7, so that the air is compressed. When the air volume detector 8 detects that the exhaust volume of the exhaust pipe 7 is reduced, the conversion disk 112 is driven by the motor to rotate 40 degrees, and the rotation direction is downward. Figure 3 The middle arrow indicates the direction, and the air filter 114 in the conversion slot 113 rotates with the conversion disk 112. At this time, the used air filter 114 will begin to separate from between the two groups of vents 116, and another group of new air filters 114 will move between the two groups of vents 116 to achieve the replacement of the air filter 114. In this process, the used air filter 114 rotates with the conversion disk 112 to the discharge port 122 at the bottom of the external box 111, and the vacant conversion slot 113 on the conversion disk 112 will rotate to the lower end of the storage tube 115. Under the action of gravity, the used air filter 114 will automatically separate from the external box 111, and the unused air filter 114 will automatically separate from the external box 111. The air filter 114 will be automatically filled into the vacant conversion slot 113. Compared with the prior art, multiple sets of air filters 114 can be placed in the storage tube 115 at one time, giving the staff sufficient time to clean the air filter 114, so that the staff can clean the air filter 114 more thoroughly. Secondly, during the driving process of the conversion disk 112, not only the replacement of the air filter 114 is realized, but also the used air filter 114 is discharged from the external box 111 and the unused air filter 114 is added to the external box 111, which makes it more convenient for the staff to take and put the air filter 114, and indirectly improves the staff's efficiency in replacing and cleaning the air filter 114.

[0030] Furthermore, sealing pads 117 are fixedly installed at both ends of the air filter 114, and the sealing pads 117 are in contact with the inner wall of the external box 111. Arc plates 118 for squeezing the sealing pads 117 are fixedly installed on both sides of the external box 111. First inverted slopes 81 are provided at both ends of the arc plate 118, and the vent 116 is located on the arc plate 118.

[0031] Specifically, the sealing gasket 117 has good elasticity. When the new air filter 114 rotates between the two groups of vents 116, the sealing gaskets 117 located at both ends of the air filter 114 first slide against the inner wall of the external box 111, and then the sealing gasket 117 will contact the first inverted slope 81 at the end of the arc plate 118. The sealing gasket 117 will be squeezed by the first inverted slope 81, causing the sealing gasket 117 to deform until the sealing gasket 117 is completely offset from the first inverted slope 81. At the same time, the new air filter 114 is located between the two groups of vents 116. At this time, the deformed sealing gasket 117 will generate a rebound force, causing the sealing gasket 117 to fit tightly against the arc plate 118, thereby ensuring the sealing between the end of the air filter 114 and the arc plate 118. Embodiment 2

[0032] like Figures 5 to 8 As shown, in contrast to Example 1, another embodiment of the present invention is that sealing mechanisms 121 are fixedly installed at both ends of the air filter 114, and the sealing mechanism 121 includes an inner ring 1211, the inner ring 1211 is fixedly connected to the end of the air filter 114, an outer ring 1212 sleeved on the inner ring 1211, the outer ring 1212 is close to the end of the air filter 114, a rubber pad 1213 is arranged between the outer ring 1212 and the inner ring 1211, a cylinder body 1214 is arranged in the inner ring 1211, a piston head 1216 movably inserted in the cylinder body 1214, six groups of connecting pipes 1215 distributed at equal angles between the cylinder body 1214 and the inner ring 1211, one end of the connecting pipe 1215 is fixedly connected to the outer ring of the cylinder body 1214, and the connecting pipe 1215 is connected to the interior of the cylinder body 1214, an annular cavity 131 is provided in the rubber pad 1213, the other end of the connecting pipe 1215 passes through the annular cavity 131 and is fixedly connected to the inner ring of the outer ring 1212, a sealing sleeve 161 is mounted on the piston head 1216, and the outer ring of the sealing sleeve 161 is close to the inner wall of the cylinder body 1214, two groups of guide grooves 119 are opened on both sides of the external box 111, the end of the piston head 1216 is located in the guide groove 119, the guide groove 119 is composed of an arc groove 91 and a straight groove 92, one end of the arc groove 91 is connected to the two groups of straight grooves 92 respectively, and the other end of one group of arc grooves 91 is provided with a second inverted slope 93 for pushing the end of the piston head 1216, and a plurality of groups of openings 151 are opened on the other end of the connecting pipe 1215.

[0033] Specifically, when the sealing rubber pad 117 is squeezed by the first inverted slope 81, the contact area between the first inverted slope 81 and the sealing rubber pad 117 is limited, so that the sealing rubber pad 117 in motion is subjected to a very large friction by the arc plate 118. The large friction will accelerate the wear of the sealing rubber pad 117, thereby reducing the service life of the sealing rubber pad 117. In the initial state, gas is injected into the annular cavity 131, so that the rubber pad 1213 can fit the inner wall of the external box 111. The ends of the piston heads 1216 on the sealing mechanisms 121 at both ends of the air filter 114 are located at the intersection of the corresponding arc grooves 91 and the straight grooves 92. When the air filter 114 rotates with the conversion disk 112, the rubber pad 1213 on the sealing mechanism 121 will slide against the inner wall of the external box 111, and at the same time, the end of the piston head 1216 will slide along the arc groove 91. When the piston head 121 When the end of the piston head 1216 slides to the other end of the arc groove 91, the end of the piston head 1216 will be squeezed by the second inverted slope 93 at the other end of the arc groove 91, so that the piston head 1216 and the sealing sleeve 161 slide along the inner cavity of the cylinder body 1214, and at the same time, the air in the inner cavity of the cylinder body 1214 is pressed into the six groups of connecting pipes 1215, and then the air in the connecting pipes 1215 enters the annular cavity 131 of the rubber pad 1213 through the opening 151, so that the rubber pad 1213 expands until the end of the piston head 1216 is offset from the second inverted slope 93, and the expanded rubber pad 1213 will be close to the inner wall of the external box 111, so as to ensure the sealing between the end of the air filter 114 and the inner wall of the external box 111, and at the same time, the rubber pad 1213 will not be subjected to excessive friction, thereby reducing the wear of the rubber pad 1213 and improving the service life of the rubber pad 1213.

[0034] Working principle: a group of air compression screws 3 are driven by a motor to rotate, and the group of air compression screws 3 drives the corresponding gears 9 to rotate. At the same time, the meshing transmission of the two groups of gears 9 causes the other group of air compression screws 3 to rotate. As the two groups of air compression screws 3 continue to rotate, the outside air enters the air filter 114 through the vent 116, and the air is filtered by the filter element 41 inside the air filter 114. The filtered air enters the air compression box 2 through the intake pipe 10, and then the air is compressed by the two groups of air compression screws 3. The compressed air enters the heat conducting plate 5 through the air supply pipe 4, and the fan 6 is started at the same time. The fan 6 accelerates the air flow inside the outer shell 1, and the compressed air is dissipated and cooled through the heat conducting plate 5. The gas after dissipation and cooling is discharged through the exhaust pipe 7, so as to realize the positioning compression of the air. When the air volume detector 8 detects that the exhaust volume of the exhaust pipe 7 is reduced, the conversion disk 112 is driven by the motor to rotate 40 degrees, and the rotation direction is attached below Figure 3The middle arrow indicates the direction, and the air filter 114 in the conversion slot 113 rotates together with the conversion disk 112. At this time, the used air filter 114 will begin to separate from between the two groups of vents 116, and another group of new air filters 114 will move toward between the two groups of vents 116 to achieve the replacement of the air filter 114. In this process, the used air filter 114 rotates to the discharge port 122 at the bottom of the external box 111 along with the conversion disk 112, and the empty conversion slot 113 on the conversion disk 112 will rotate to the lower port of the storage tube 115. Under the action of gravity, the used air filter 114 will automatically separate from the external box 111, and the unused air filter 114 will automatically fill the empty conversion slot 113;

[0035] When the new air filter 114 rotates between the two groups of vents 116, the sealing pads 117 located at both ends of the air filter 114 slide against the inner wall of the external box 111 at first, and then the sealing pads 117 will contact the first inverted slope 81 at the end of the arc plate 118, and the sealing pads 117 will be squeezed by the first inverted slope 81, so that the sealing pads 117 are deformed until the sealing pads 117 are completely offset from the first inverted slope 81. At the same time, the new air filter 114 is located between the two groups of vents 116. At this time, the deformed sealing pads 117 will generate a rebound force, so that the sealing pads 117 are tightly attached to the arc plate 118, ensuring the sealing between the end of the air filter 114 and the arc plate 118.

[0036] In the initial state, the annular cavity 131 is filled with gas, so that the rubber pad 1213 can fit the inner wall of the external box 111, and the ends of the piston heads 1216 on the sealing mechanisms 121 at both ends of the air filter 114 are located at the intersection of the corresponding arc groove 91 and the linear groove 92. When the air filter 114 rotates with the conversion disk 112, the rubber pad 1213 on the sealing mechanism 121 will slide against the inner wall of the external box 111, and the end of the piston head 1216 will slide along the arc groove 91. When the end of the piston head 1216 slides to the other end of the arc groove 91, the end of the piston head 1216 will be affected by the arc groove. The second inverted slope 93 at the other end of 91 is squeezed, so that the piston head 1216 and the sealing sleeve 161 slide along the inner cavity of the cylinder body 1214, and at the same time, the air in the inner cavity of the cylinder body 1214 is pressed into the six groups of connecting pipes 1215, and then the air in the connecting pipes 1215 enters the annular cavity 131 of the rubber pad 1213 through the opening 151, so that the rubber pad 1213 expands until the end of the piston head 1216 is offset from the second inverted slope 93, and the expanded rubber pad 1213 will be close to the inner wall of the external box 111, thereby ensuring the sealing between the end of the air filter 114 and the inner wall of the external box 111.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A screw air compression device, comprising an outer shell (1), characterized in that: An air compression box (2) is fixedly installed in the outer shell (1), and two groups of air compression screws (3) meshing with each other are rotatably installed in the air compression box (2). The air outlet end of the air compression box (2) is connected to an air supply pipe (4), and one end of the air supply pipe (4) is connected to a heat conducting plate (5). A fan (6) is installed on one side of the heat conducting plate (5), and the lower end of the heat conducting plate (5) is connected to an exhaust pipe (7). An air volume detector (8) is installed at the end of the exhaust pipe (7). Gears (9) are fixedly mounted on the ends of the two groups of air compression screws (3), and the two groups of gears (9) mesh with each other. The air inlet end of the air compression box (2) is connected to an air inlet pipe (10), and one end of the air inlet pipe (10) is provided with an air filter mechanism (11); The air filtering mechanism (11) comprises: An external hanging box (111), wherein the external hanging box (111) is fixedly connected to one end of the outer shell (1); A conversion plate (112) is rotatably mounted in the external box (111), wherein the conversion plate (112) is provided with nine groups of conversion slots (113) at equal angles for placing an air filter (114), wherein a filter element (41) is disposed in the air filter (114); A storage pipe (115) for storing an air filter (114) is arranged on the external box (111), ventilation holes (116) are symmetrically provided on both sides of the external box (111), one end of the air intake pipe (10) is connected to a group of ventilation holes (116), and a discharge port (122) is provided at the bottom of the external box (111); Sealing mechanisms (121) are fixedly mounted at both ends of the air filter (114), and the sealing mechanisms (121) include: An inner ring (1211), wherein the inner ring (1211) is fixedly connected to an end of the air filter (114); An outer ring (1212) sleeved on the inner ring (1211), the outer ring (1212) being in close contact with an end of the air filter (114); A rubber pad (1213) disposed between the outer ring (1212) and the inner ring (1211); A cylinder body (1214) disposed in the inner ring (1211); A piston head (1216) movably inserted into the cylinder body (1214); Six groups of connecting pipes (1215) are distributed at equal angles between the cylinder body (1214) and the inner ring (1211).

2. A screw type air compression device according to claim 1, characterized in that: One end of the connecting pipe (1215) is fixedly connected to the outer ring of the cylinder body (1214), and the connecting pipe (1215) is connected to the interior of the cylinder body (1214).

3. A screw type air compression device according to claim 2, characterized in that: An annular cavity (131) is provided in the rubber pad (1213), the other end of the connecting tube (1215) passes through the annular cavity (131) and is fixedly connected to the inner ring of the outer ring (1212), and a plurality of groups of openings (151) are provided on the other end of the connecting tube (1215).

4. A screw type air compression device according to claim 3, characterized in that: A sealing sleeve (161) is sleeved on the piston head (1216), and an outer ring of the sealing sleeve (161) is in close contact with the inner wall of the cylinder body (1214).

5. A screw type air compression device according to claim 4, characterized in that: Two groups of guide grooves (119) are provided on both sides of the external box (111), and the ends of the piston heads (1216) are located in the guide grooves (119).

6. A screw type air compression device according to claim 5, characterized in that: The guide groove (119) is composed of an arc groove (91) and a straight groove (92); one end of the arc groove (91) is connected to the straight groove (92); and the other end of a group of arc grooves (91) is provided with a second inverted inclined surface (93) for pushing the end of the piston head (1216).

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