Multifunctional spiral air compressor

Abstract

The invention belongs to the technical field of air compressors, and particularly relates to a multifunctional spiral air compressor which comprises a box body, a purifying box, a bowl-shaped part and a second filtering structure. A spiral air compressor main body is mounted in the box body, and an air inlet valve pipe is connected to the spiral air compressor main body; the purification box is installed outside the box body and communicated with the air inlet valve pipe, and an air inlet pipe is connected to the purification box; the bowl-shaped piece is mounted in the purification box, a filtering part is arranged on the bowl-shaped piece, and a cleaning mechanism is mounted on the bowl-shaped piece; the second filtering structure is mounted in the purifying box, is arranged on the lower side of the bowl-shaped piece and comprises a partition plate. According to the spiral air compressor, inlet air of the spiral air compressor can be efficiently filtered, dust and impurities are effectively prevented from entering the spiral air compressor, abrasion of a screw and other parts can be greatly reduced, the service life of the screw and other parts is guaranteed, the failure rate of the spiral air compressor is reduced, and normal use of the spiral air compressor is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of air compressors, and in particular relates to a multifunctional screw air compressor. Background Art

[0002] Screw air compressor is a common industrial equipment, its main function is to compress gas and provide a stable gas supply. Its compression method mainly relies on two main components: screw main shaft and stator housing, that is, air enters the compressor through the air inlet of the screw air compressor. As the screw main shaft rotates, the space between the screw main shaft and the stator housing will gradually decrease, and the air will be compressed and discharged. Screw air compressor has the advantages of simple structure, stable operation, low noise, stable pressure, etc. It is widely used in gas source equipment in various industries, such as refrigeration equipment, chemical industry, construction engineering, electronic equipment manufacturing, food processing and medical health, etc. It is one of the indispensable equipment for modern industrial production and life.

[0003] When the existing screw air compressor is in use, it only filters the intake air through a single filter screen, which has the problem of incomplete filtration and poor filtering effect, which leads to the intake air easily containing more dust and impurities. These dust and impurities easily increase the wear of the screw and other parts in the screw air compressor, reduce the service life of the screw and other parts, and easily increase the failure rate of the screw air compressor, affecting the normal use of the screw air compressor.

[0004] Therefore, in view of the above-mentioned technical problems, it is necessary to provide a kind of multifunctional screw air compressor.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a multifunctional screw air compressor, which can solve the problem of poor air intake filtering effect of the screw air compressor.

[0007] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows:

[0008] A multifunctional screw air compressor comprises: a box body, a purification box, a bowl-shaped member and a second filtering structure;

[0009] A screw air compressor body is installed in the box, and an air intake valve pipe is connected to the screw air compressor body;

[0010] The purification box is installed outside the box and is in communication with the air intake valve pipe. The purification box is connected with an air intake pipe.

[0011] The bowl-shaped member is installed in the purification box, a filter portion is provided on the bowl-shaped member, and a cleaning mechanism is installed on the bowl-shaped member;

[0012] The second filter structure is installed in the purification box and is arranged on the lower side of the bowl-shaped member. The second filter structure includes a partition, a connecting pipe is connected to the center of the partition, an annular box is installed on the partition, an outer frame is provided on the side wall of the annular box, a filter curtain is connected to the outer frame, and a wetting mechanism is installed on the side wall of the purification box, and the wetting mechanism corresponds to the filter curtain.

[0013] In one or more embodiments of the present invention, the cleaning mechanism includes a rotating shaft, the rotating shaft is rotatably connected to the bowl-shaped member, and the rotating shaft is used to connect the fan blade and the scraper;

[0014] The side wall of the rotating shaft located in the air intake pipe is connected to a bearing sleeve, and a plurality of reinforcing rods are connected between the bearing sleeve and the inner wall of the air intake pipe. The cooperation between the bearing sleeve and the plurality of reinforcing rods can stabilize the rotating shaft and prevent the rotating shaft from shaking during rotation.

[0015] In one or more embodiments of the present invention, one end of the rotating shaft located in the air intake pipe is connected to a fan blade, and the other end of the rotating shaft is connected to a scraper. When the gas flows in the air intake pipe, the gas exerts a force on the fan blade, so that the fan blade can rotate around the rotating shaft, thereby driving the scraper to rotate.

[0016] In one or more embodiments of the present invention, the scraper corresponds to the bowl-shaped member, and a cleaning part is installed on the scraper, and the cleaning part corresponds to the filter part. When the scraper rotates, the cleaning part installed on the scraper can clean the filter part to prevent the filter part from being blocked by dust and impurities in the gas, thereby ensuring that the gas can pass through the filter part normally.

[0017] In one or more embodiments of the present invention, the annular box is arranged on the outside of the connecting pipe, and a sealing piece is connected to the center of the filter curtain. The sealing piece corresponds to the connecting pipe. When the electric cylinder contracts, the sealing piece can cover the connecting pipe to prevent the wetting liquid from entering the connecting pipe when being discharged through the nozzle, thereby playing a blocking role.

[0018] In one or more embodiments of the present invention, a plurality of electric cylinders evenly distributed around the circumference are connected to the partition, and one end of the electric cylinders is connected to the outer frame. When the electric cylinders are extended, the filter curtain will be in a horizontal state, so that the gas can flow through the electric cylinders and the gas can be filtered by the electric cylinders; when the electric cylinders are contracted, the filter curtain will be in a conical state, which is convenient for cleaning dust and impurities on the surface of the filter curtain.

[0019] In one or more embodiments of the present invention, the wetting mechanism includes a liquid storage tank, in which a wetting liquid and a submersible pump are arranged. The submersible pump is arranged in the wetting liquid. When the submersible pump is running, the submersible pump can extract the wetting liquid.

[0020] In one or more embodiments of the present invention, an annular tube is provided in the purification box, and an infusion tube is connected between the annular tube and the submersible pump, and the wetting liquid extracted by the submersible pump enters the annular tube through the infusion tube;

[0021] The annular tube is connected to a plurality of nozzles evenly distributed around the circumference, and the nozzles correspond to the filter curtain. The wetting liquid in the annular tube is sprayed toward the filter curtain through the plurality of nozzles, thereby cleaning the dust and impurities filtered on the surface of the filter curtain and also wetting the filter curtain. The wet filter curtain can better filter the dust and impurities in the gas.

[0022] In one or more embodiments of the present invention, a drain pipe is connected to the side wall of the purification box, one end of which passes through the purification box and the annular box. A control valve is installed on the drain pipe. When the control valve is opened, the wetting liquid in the annular box is discharged through the drain pipe to prevent the wetting liquid from overflowing from the annular box.

[0023] In one or more embodiments of the present invention, a bottom plate is fixedly connected to the inner wall of the purification box, and the bottom plate is used to place the sound-absorbing cotton;

[0024] A guide plate is provided on the upper side of the bottom plate, and the guide plate is provided on the lower side of the partition plate. The guide plate is used to place the drying layer and guide the gas flow;

[0025] A second grid is provided on the guide plate, a drying layer is placed on the guide plate, and the drying layer covers the second grid. When the gas passes through the wet filter curtain, it may contain moisture. The drying layer can be used to dry the gas, and the dried gas continues to flow through the second grid.

[0026] Compared with the prior art, the multifunctional screw air compressor of the present invention can efficiently filter the intake air of the screw air compressor, effectively preventing dust and impurities from entering the screw air compressor, thereby greatly reducing the wear of the screw and other components, ensuring the service life of the screw and other components, reducing the failure rate of the screw air compressor, and facilitating the normal use of the screw air compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a partial structural cross-sectional view of a multifunctional screw air compressor in one embodiment of the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the structure at A in the middle;

[0030] Figure 3 for Figure 1 Schematic diagram of the structure at B in the middle;

[0031] Figure 4 for Figure 1 Schematic diagram of the structure at C in the middle;

[0032] Figure 5 for Figure 1 Schematic diagram of the structure at D in the middle;

[0033] Figure 6 for Figure 1 Schematic diagram of the structure at E in the middle;

[0034] Figure 7 The present invention is a three-dimensional diagram of a multifunctional screw air compressor according to an embodiment of the present invention.

[0035] Description of main reference numerals:

[0036] 1-box, 101-inlet valve pipe, 2-purification box, 201-inlet pipe, 3-bowl-shaped part, 301-filter part, 302-rotating shaft, 303-reinforcement rod, 304-fan blade, 305-scraper, 306-cleaning part, 4-second filtering structure, 401-partition, 402-connecting pipe, 403-annular box, 404-outer frame, 405-filter curtain, 406-blocking part, 407-electric cylinder, 408-liquid storage tank, 409-wetting liquid, 410-submersible pump, 411-annular pipe, 412-nozzle, 413-drain pipe, 5-bottom plate, 501-first grid, 502-silence cotton, 503-guide plate, 504-second grid, 505-drying layer. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] like Figures 1 to 7 As shown, a multifunctional screw air compressor in one embodiment of the present invention includes a housing 1, a purification box 2, a bowl-shaped member 3 and a second filter structure 4.

[0039] The box body 1 is provided with a screw air compressor body, to which an air intake valve pipe 101 is connected. When the screw air compressor body is running, external air can be absorbed through the air intake valve pipe 101 .

[0040] like Figures 1 to 7 As shown, the purification box 2 is installed outside the box body 1 and is connected to the intake valve pipe 101. The purification box 2 is used to install the bowl-shaped member 3, the second filtering structure 4 and the bottom plate 5.

[0041] Among them, the purification box 2 is connected with an air intake pipe 201, and the external gas can enter the purification box 2 through the air intake pipe 201 to filter the gas, which is used to remove dust and impurities in the gas and prevent dust and impurities from entering the screw air compressor. This can greatly reduce the wear of the screw and other components in the main body of the screw air compressor, ensure the service life of the screw and other components, reduce the failure rate of the screw air compressor, and facilitate the normal use of the screw air compressor.

[0042] In addition, a cover door is hingedly connected to the side wall of the purification box 2, and the cover door corresponds to the sound-absorbing cotton 502 and the drying layer 505, so that the sound-absorbing cotton 502 and the drying layer 505 can be replaced conveniently.

[0043] like Figures 1 to 7 As shown, the bowl-shaped member 3 is installed in the purification box 2, and the bowl-shaped member 3 is used to install the filter part 301. The bowl-shaped member 3 is provided with a filter part 301, and the filter part 301 is used to initially filter the gas, and then to remove dust impurities in the gas to prevent the dust impurities from affecting the main body of the screw air compressor.

[0044] A cleaning mechanism is installed on the bowl-shaped member 3 , and the filter part 301 can be cleaned by the cleaning mechanism to prevent the filter part 301 from being blocked by dust and impurities, thereby ensuring the effect of gas passing through the filter part 301 .

[0045] like Figures 1 to 7As shown, the cleaning mechanism includes a rotating shaft 302 , which is rotatably connected to the bowl-shaped member 3 , and the rotating shaft 302 is used to connect the fan blades 304 and the scraper 305 .

[0046] The side wall of the rotating shaft 302 located in the air intake pipe 201 is connected with a bearing sleeve, and a plurality of reinforcing rods 303 are connected between the bearing sleeve and the inner wall of the air intake pipe 201. The rotating shaft 302 can be stabilized by the cooperation between the bearing sleeve and the plurality of reinforcing rods 303 to prevent the rotating shaft 302 from shaking during rotation.

[0047] In addition, one end of the rotating shaft 302 located in the air inlet pipe 201 is connected to the fan blade 304, and the other end of the rotating shaft 302 is connected to the scraper 305. When the gas flows in the air inlet pipe 201, the gas exerts a force on the fan blade 304, so that the fan blade 304 can drive the rotating shaft 302 to rotate, and then drive the scraper 305 to rotate.

[0048] Specifically, the scraper 305 corresponds to the bowl-shaped member 3, and a cleaning portion 306 is mounted on the scraper 305, and the cleaning portion 306 corresponds to the filter portion 301. When the scraper 305 rotates, the cleaning portion 306 mounted on the scraper 305 can clean the filter portion 301, thereby preventing the filter portion 301 from being blocked by dust and impurities in the gas, and ensuring that the gas can pass through the filter portion 301 normally.

[0049] Preferably, the cleaning portion 306 is a cleaning sponge.

[0050] like Figures 1 to 7 As shown, the second filter structure 4 is installed in the purification box 2 and is arranged on the lower side of the bowl-shaped member 3. The second filter structure 4 is used to filter the dust impurities in the gas again to prevent the dust impurities from entering the main body of the screw air compressor, thereby ensuring that the main body of the screw air compressor can operate safely and stably.

[0051] The second filtering structure 4 includes a partition 401 , and a connecting pipe 402 is connected to the center of the partition 401 . The gas filtered by the filter unit 301 will continue to flow through the connecting pipe 402 .

[0052] In addition, an annular box 403 is installed on the partition 401. The annular box 403 is arranged outside the connecting pipe 402. The annular box 403 is used to install the filter curtain 405 and to collect the wetting liquid 409 cleaned by the filter curtain 405 so as to centrally process the wetting liquid 409.

[0053] Specifically, the side wall of the annular box 403 is provided with an outer frame 404, and the outer frame 404 is used to install a filter curtain 405, and the filter curtain 405 is connected to the outer frame 404. The filter curtain 405 can be used to filter the gas again to prevent dust impurities from being contained in the gas.

[0054] Preferably, the filter curtain 405 is a curtain fabric, which can be purchased and used directly.

[0055] In addition, a blocking piece 406 is connected to the center of the filter curtain 405, and the blocking piece 406 corresponds to the connecting pipe 402. When the electric cylinder 407 contracts, the blocking piece 406 can cover the connecting pipe 402 to prevent the wetting liquid 409 from entering the connecting pipe 402 when it is discharged through the nozzle 412, thereby playing a blocking role.

[0056] like Figures 1 to 7 As shown, a plurality of electric cylinders 407 evenly distributed around the circumference are connected to the partition 401, and one end of the electric cylinder 407 is connected to the outer frame 404. When the plurality of electric cylinders 407 are extended, the filter curtain 405 will be in a horizontal state, that is, Figure 1 The state shown in the figure allows the gas to flow through the electric cylinder 407 and filter the gas by the electric cylinder 407. When the electric cylinders 407 are contracted, the filter curtain 405 will be in a conical state, which is convenient for cleaning the dust and impurities on the surface of the filter curtain 405.

[0057] like Figures 1 to 7 As shown, a wetting mechanism is installed on the side wall of the purification box 2, and the wetting mechanism corresponds to the filter curtain 405. The wetting mechanism is not only used to clean the dust impurities on the surface of the filter curtain 405, so that the filter curtain 405 can continue to filter the gas, but also can wet the filter curtain 405. When the gas passes through the filter curtain 405, wetting the filter curtain 405 can achieve a better filtering effect, and can also reduce the temperature of the gas passing through the filter curtain 405, so that when the gas enters the main body of the screw air compressor, the temperature inside the main body of the screw air compressor is reduced to avoid high temperature.

[0058] The wetting mechanism includes a liquid storage tank 408, in which a wetting liquid 409 and a submersible pump 410 are arranged. The submersible pump 410 is arranged in the wetting liquid 409. When the submersible pump 410 is running, the submersible pump 410 can extract the wetting liquid 409.

[0059] Preferably, the wetting liquid 409 is water, and a feeding pipe and a feeding door are provided on the side wall of the liquid storage tank 408. The wetting liquid 409 can be replenished through the feeding pipe, and ice cubes can be thrown into the liquid storage tank 408 through the feeding door to reduce the temperature of the wetting liquid 409, thereby reducing the temperature of the filter curtain 405. When the gas passes through the filter curtain 405, the gas temperature can also be reduced. When the gas enters the screw air compressor body, the temperature of the screw air compressor body can be reduced.

[0060] In addition, an annular tube 411 is provided in the purification box 2, and a liquid infusion tube is connected between the annular tube 411 and the submersible pump 410. The wetting liquid 409 extracted by the submersible pump 410 enters the annular tube 411 through the liquid infusion tube.

[0061] Specifically, the annular tube 411 is connected with a plurality of nozzles 412 evenly distributed around the circumference, and the nozzles 412 correspond to the filter curtain 405. The wetting liquid 409 in the annular tube 411 is sprayed toward the filter curtain 405 through the plurality of nozzles 412, thereby cleaning the dust and impurities filtered on the surface of the filter curtain 405, and also wetting the filter curtain 405. The wet filter curtain 405 can better filter the dust and impurities in the gas, and can also reduce the temperature of the gas passing through the filter curtain 405, so that when the gas enters the main body of the screw air compressor, the temperature in the main body of the screw air compressor is reduced to avoid the high temperature phenomenon.

[0062] In addition, a drain pipe 413 is connected to the side wall of the purification box 2, one end of which passes through the purification box 2 and the annular box 403, and a control valve is installed on the drain pipe 413. When the control valve is opened, the wetting liquid 409 in the annular box 403 is discharged through the drain pipe 413 to prevent the wetting liquid 409 from overflowing the annular box 403.

[0063] like Figures 1 to 7 As shown, a bottom plate 5 is fixedly connected to the inner wall of the purification box 2, and the bottom plate 5 is used to place the sound-absorbing cotton 502.

[0064] The bottom plate 5 is provided with a first grid 501, which corresponds to the air inlet valve pipe 101. The bottom plate 5 is provided with a sound-absorbing cotton 502, which covers the first grid 501. The sound-absorbing cotton 502 can play a sound-absorbing role to avoid excessive noise when the main body of the screw air compressor is running.

[0065] In addition, a guide plate 503 is provided on the upper side of the bottom plate 5, and the guide plate 503 is provided on the lower side of the partition plate 401. The guide plate 503 is used to place the drying layer 505 and to guide the gas flow.

[0066] Specifically, the guide plate 503 is provided with a second grid frame 504, and a drying layer 505 is placed on the guide plate 503, and the drying layer 505 covers the second grid frame 504. When the gas passes through the wet filter curtain 405, it may contain moisture, and the drying layer 505 can be used to dry the gas, and the dried gas continues to flow through the second grid frame 504.

[0067] During specific use, when the main body of the screw air compressor is running, the main body of the screw air compressor forms a negative pressure state in the purification box 2 through the air intake valve pipe 101 , and the external air enters the purification box 2 through the air intake pipe 201 .

[0068] After the gas is filtered by the filter unit 301, it is filtered by the filter curtain 405 to fully remove dust impurities in the gas. Finally, the gas enters the main body of the screw air compressor through the connecting pipe 402, the second grid 504, the first grid 501 and the intake valve pipe 101.

[0069] When the gas passes through the air inlet pipe 201, the gas will impact the fan blade 304, so that the fan blade 304 drives the rotating shaft 302, the scraper 305 and the cleaning part 306 to rotate. The rotating cleaning part 306 can clean the filter part 301, prevent the filter part 301 from being blocked by dust and impurities, and ensure that the gas continues to pass through the filter part 301.

[0070] When filtering the gas, the submersible pump 410 can also be operated, the submersible pump 410 extracts the moistening liquid 409 and delivers it to the annular tube 411 through the infusion tube, and the moistening liquid 409 in the annular tube 411 is sprayed to the filter curtain 405 through a plurality of nozzles 412. It is not only used to clean the dust impurities on the surface of the filter curtain 405 so that the filter curtain 405 can continue to filter the gas, but also can wet the filter curtain 405. When the gas passes through the filter curtain 405, the wet filter curtain 405 can achieve a better filtering effect, and can also reduce the temperature of the gas passing through the filter curtain 405, so that when the gas enters the main body of the screw air compressor, the temperature inside the main body of the screw air compressor is reduced to avoid high temperature.

[0071] When the filter curtain 405 is wetted, several electric cylinders 407 can be controlled to shrink synchronously. When several electric cylinders 407 shrink, the filter curtain 405 will be in a conical state, which is convenient for cleaning dust and impurities on the surface of the filter curtain 405. When the filter curtain 405 is cleaned, several electric cylinders 407 are controlled to extend synchronously, and the filter curtain 405 will be in a horizontal state, that is, Figure 1 The state shown is such that the gas flows through the electric cylinder 407 and the electric cylinder 407 is used to filter the gas.

[0072] The moistened gas passing through the filter curtain 405 will pass through the drying layer 505, and the drying layer 505 can be used to dry the gas to remove moisture from the gas. The dried gas continues to flow through the second grid 504, and after being silenced by the silencer cotton 502, it enters the main body of the screw air compressor through the intake valve pipe 101.

[0073] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0074] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A multifunctional screw air compressor, characterized in that: include: A box body, in which a screw air compressor body is installed, and an air intake valve pipe is connected to the screw air compressor body; A purification box is installed outside the box and is in communication with the air inlet valve pipe. The purification box is connected to an air inlet pipe. A bowl-shaped member is installed in the purification box, a filter portion is provided on the bowl-shaped member, and a cleaning mechanism is installed on the bowl-shaped member; The second filtering structure is installed in the purification box and is arranged on the lower side of the bowl-shaped member. The second filtering structure includes a partition, a connecting pipe is connected to the center of the partition, an annular box is installed on the partition, an outer frame is provided on the side wall of the annular box, a filter curtain is connected to the outer frame, and a wetting mechanism is installed on the side wall of the purification box, and the wetting mechanism corresponds to the filter curtain.

2. A multifunctional screw air compressor according to claim 1, characterized in that: The cleaning mechanism comprises a rotating shaft, which is rotatably connected to the bowl-shaped member. The side wall of the rotating shaft located in the air inlet pipe is connected to a bearing sleeve, and a plurality of reinforcing rods are connected between the bearing sleeve and the inner wall of the air inlet pipe.

3. A multifunctional screw air compressor according to claim 2, characterized in that: One end of the rotating shaft located in the air inlet pipe is connected with a fan blade, and the other end of the rotating shaft is connected with a scraper.

4. A multifunctional screw air compressor according to claim 3, characterized in that: The scraper corresponds to the bowl-shaped member, a cleaning portion is mounted on the scraper, and the cleaning portion corresponds to the filtering portion.

5. The multifunctional screw air compressor according to claim 1, characterized in that: The annular box is arranged outside the connecting pipe, and a blocking piece is connected to the center of the filter curtain, and the blocking piece corresponds to the connecting pipe.

6. A multifunctional screw air compressor according to claim 5, characterized in that: The partition is connected to a plurality of electric cylinders evenly distributed around the circumference, and one end of the electric cylinder is connected to the outer frame.

7. A multifunctional screw air compressor according to claim 6, characterized in that: The wetting mechanism comprises a liquid storage tank, in which a wetting liquid and a submersible pump are arranged, and the submersible pump is arranged in the wetting liquid.

8. A multifunctional screw air compressor according to claim 7, characterized in that: An annular tube is arranged in the purification box, an infusion tube is connected between the annular tube and the submersible pump, a plurality of nozzles evenly distributed around the circumference are connected to the annular tube, and the nozzles correspond to the filter curtain.

9. A multifunctional screw air compressor according to claim 8, characterized in that: The side wall of the purification box is connected with a drain pipe, one end of which passes through the purification box and the annular box, and a control valve is installed on the drain pipe.

10. A multifunctional screw air compressor according to claim 9, characterized in that: The inner wall of the purification box is fixedly connected with a bottom plate, the upper side of the bottom plate is provided with a guide plate, the guide plate is arranged on the lower side of the partition, a second grid is provided on the guide plate, a drying layer is placed on the guide plate, and the drying layer covers the second grid.

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