Air compressor air filter

Abstract

The present invention relates to the technical field of air filtering equipment, and in particular discloses an air compressor air filter, comprising a shell, which is provided with an air inlet end and an air outlet end, and a primary filter layer and a secondary filter layer are provided in the shell, the primary filter layer is located at the air inlet end, and the secondary filter layer is located at the air outlet end, and the primary filter layer includes a first fixing frame and a primary filter plate. Compared with traditional technology, the air compressor air filter of this technical solution can realize the filtering function of air when in use. When the secondary filter plate and the primary filter plate are replaced alternately, the air compressor does not need to be shut down, and the operation and service life of the air compressor will not be affected by replacing the secondary filter plate and the primary filter plate. The problem of filter blockage at the front air inlet of the air compressor is solved, the power loss of the air compressor is saved, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air filtering equipment, in particular to an air filter for an air compressor. Background Art

[0002] Air compressor is the abbreviation of air compressor. Through air compressor, people can compress air to meet different production and life needs. The air inlet end of the air compressor is connected to the outside air. In order to prevent impurities such as dust, flocs and soil in the air from entering the air compressor and damaging the equipment, an air filter device is often required to be installed at the air inlet end of the air compressor to purify the air.

[0003] Existing devices for filtering air compressors generally use filter cartridges. By installing a filter element in the filter cartridge, the outside air passes through the filter cartridge and impurities are blocked by the filter element, thereby achieving air filtration. The filter element is also called an air filter element, and its structure is mostly folded (you can refer to the air filter element used in air conditioners). After the air passes through the folded filter element, impurities are retained on the fold, and the air enters the air compressor through the fold.

[0004] After the filter element has been used for a period of time, too many impurities on it will clog the filter element. If it is not cleaned in time, the air intake of the air compressor will be blocked, the air intake pressure will be too high, and the energy consumption of the air compressor will increase due to this. For this reason, people usually set a reverse blowing function, that is, blowing from the inside of the filter element to the outside, using wind force to remove impurities remaining on the filter element folds. However, according to the applicant's on-site investigation and communication with the user unit, it was concluded that reverse blowing cannot effectively remove impurities on the filter element, because due to the influence of the filter element folding structure, whether it is soil or flocs (such as catkins), they will remain in the gap between the folds, which is equivalent to being stuck. Even if the wind force of the reverse blowing is strong, the wind force after passing through the filter element will be greatly reduced. Simply blowing cannot solve the problem of filter element clogging at all, and the effect is minimal. The only solution is to replace the filter element regularly, but the filter cartridge The filter element is larger and contains more than one filter element. The filter cartridge needs to be removed during the replacement process, which is time-consuming. Once the filter cartridge is removed, the air compressor that has lost its front-end filtering function must stop running and wait until the filter cartridge is installed before running again. For large enterprises and factories that mainly engage in production and processing, the employment cost of maintenance workers and the replacement cost of the filter element can be ignored. However, the loss caused by the suspension of related production lines or production tasks due to the air compressor shutdown is unbearable for enterprises and factories. Therefore, when the filter element is clogged, in most cases enterprises and factories still choose to focus on production and processing tasks, and continue to run the air compressor at the cost of increased energy consumption of the air compressor. The filter cartridge is removed and replaced when it is idle. As a result, the additional electricity loss cost of enterprises and factories due to the filter element blockage problem in a year ranges from hundreds of thousands to millions of yuan.

[0005] Therefore, it is necessary to propose an air compressor air filter to solve the problem of filter blockage at the front air inlet of the air compressor without affecting the production tasks of the enterprise, save the power loss of the air compressor and reduce costs. Summary of the Invention

[0006] The purpose of the present invention is to solve the problem that the filter of the front air inlet of the existing air compressor is blocked, resulting in power loss of the air compressor and high cost. An air filter for the air compressor is now provided.

[0007] The technical solution of the present invention is:

[0008] An air filter for an air compressor comprises a housing, an air inlet end and an air outlet end are provided on the housing, a primary filter layer and a secondary filter layer are provided in the housing, the primary filter layer is located at the air inlet end, and the secondary filter layer is located at the air outlet end;

[0009] The primary filter layer includes a first fixing frame and a primary filter plate, the first fixing frame is fixedly connected to the housing, the primary filter plate is provided with primary filter cotton, and the primary filter plate and the first fixing frame are clamped by a clamping piece;

[0010] The intermediate filter layer includes a second fixing frame and an intermediate filter plate. The second fixing frame is fixedly connected to the shell. The intermediate filter plate is provided with intermediate filter cotton. The intermediate filter plate is clamped to the second fixing frame through a clamping piece.

[0011] Furthermore, the first fixing frame and the second fixing frame are both grid-shaped structures, each grid of the first fixing frame is clamped with a primary filter plate, and each grid of the second fixing frame is clamped with a secondary filter plate.

[0012] Furthermore, there are two primary filter layers, which are overlapped and have a gap between them.

[0013] Furthermore, an operating room for people to walk in is provided in the shell, and the operating room is located between the intermediate filter layer and the primary filter layer. A manhole for entering the operating room is provided on the side wall of the shell, and an opening and closing door is installed on the manhole.

[0014] Furthermore, the grids of the first fixing frame and the second fixing frame are fixedly connected to the limiting plates, and the grids of the first fixing frame and the second fixing frame are also provided with card slots, which are located on opposite sides of the limiting plates. The primary filter plate and the intermediate filter plate are both located between the card slots and the limiting plates, and the clips are inserted into the card slots to fix the primary filter plate and the intermediate filter plate to the corresponding limiting plates.

[0015] Furthermore, the two primary filter layers are arranged opposite to each other, one inside and one outside. The primary filter plate and the clip on the inner primary filter layer are installed in the operating room, and the primary filter plate and the clip on the outer primary filter layer are installed at the air inlet end outside the shell.

[0016] Furthermore, the intermediate filter plate and the clamping parts thereon are installed in the operating room.

[0017] Furthermore, a sealing strip is provided between the primary filter plate and the limiting plate, and a sealing strip is provided between the secondary filter plate and the limiting plate.

[0018] Furthermore, the air inlet end is provided with a guide plate, and the guide plate is fixedly connected to the shell;

[0019] An air outlet hole is provided on the air outlet end, and the air outlet hole is connected to a gas pipeline.

[0020] Furthermore, a first pressure gauge and a second pressure gauge are installed on the housing. The first pressure gauge can detect the wind pressure when the air passes through the primary filter layer, and the second pressure gauge can detect the wind pressure when the air passes through the secondary filter layer.

[0021] The air filter of the air compressor of the present invention, air first enters from the air inlet end, passes through the primary filter layer for preliminary filtration, and then passes through the secondary filter layer for fine filtration. Small particles, flocs, soil and other impurities from the outside will be filtered onto the primary filter cotton of the primary filter plate. The finer dust and other impurities in the air will pass through the primary filter layer and be filtered out by the secondary filter layer, and remain on the secondary filter cotton of the secondary filter plate. When replacement is needed, the primary filter plate and the secondary filter plate can be replaced by disassembling the clamping piece, which takes very little time. Since they are connected by the clamping piece, the replacement of the secondary filter plate and the primary filter plate is very convenient and takes very little time. The secondary filter plate and the primary filter plate can be replaced alternately. When replacing the primary filter plate, the secondary filter plate will take on all the process Filtering work, when the intermediate filter plate needs to be replaced, the primary filter plate will also undertake the most basic filtering work. Even if a small amount of dust will enter the air compressor with the air during the replacement of the intermediate filter plate, because it takes a very short time, the amount of dust entering the air compressor can be basically ignored, and will not affect the operation and service life of the air compressor. Therefore, compared with traditional technology, the air compressor air filter of this technical solution can realize the filtering function of the air when in use. When alternately replacing the intermediate filter plate and the primary filter plate, there is no need to stop the air compressor, and the operation and service life of the air compressor will not be affected by replacing the intermediate filter plate and the primary filter plate, which solves the problem of filter blockage at the front air inlet of the air compressor, saves the power loss of the air compressor, and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural reference diagram of the present invention;

[0023] Figure 2 A perspective view of the present invention;

[0024] Figure 3This is the main view of the present invention;

[0025] Figure 4 It is a left side view of the present invention;

[0026] Figure 5 A top view of the present invention;

[0027] Figure 6 For the present invention Figure 5 Cross-section at AA;

[0028] Figure 7 For the present invention Figure 3 A partial enlarged view of the middle A;

[0029] Figure 8 The present invention uses a state reference diagram;

[0030] Figure 9 This is a front view of the first fixing bracket of the present invention;

[0031] Figure 10 is a side view of the first fixing bracket of the present invention;

[0032] Figure 11 This is a front view of the second fixing bracket of the present invention;

[0033] Figure 12 is a side view of the second fixing bracket of the present invention;

[0034] Figure 13 This is a front view of the primary filter plate of the present invention;

[0035] Figure 14 is a side view of the primary filter plate of the present invention;

[0036] Figure 15 This is a front view of the intermediate filter plate of the present invention;

[0037] Figure 16 It is a side view of the intermediate filter plate of the present invention.

[0038] Figure numerals: 1. Shell; 2. Air outlet; 3. Air inlet; 4. Primary filter layer; 5. Second pressure gauge; 6. First fixing bracket; 7. Primary filter plate; 8. Primary filter cotton; 9. Connector; 10. Intermediate filter layer; 11. Second fixing bracket; 12. Intermediate filter plate; 13. Intermediate filter cotton; 14. Operating room; 15. Manhole; 16. Opening and closing door; 17. Limiting plate; 18. Card slot; 19. Guide plate; 20. Air outlet; 21. Gas pipeline; 22. First pressure gauge. DETAILED DESCRIPTION

[0039] In order to make the technical means, technical features, invention objectives and technical effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0040] Example 1:

[0041] like Figure 1 and Figure 2 As shown, the air compressor air filter includes a housing 1, as shown Figure 5 As shown in the figure, the housing 1 is provided with an air inlet end 3 and an air outlet end 2, and the housing 1 is provided with a primary filter layer 4 and a secondary filter layer 10, the primary filter layer 4 is located at the air inlet end 3, the secondary filter layer 10 is located at the air outlet end 2, the primary filter layer 4 includes a first fixing frame 6 and a primary filter plate 7, the first fixing frame 6 is welded to the housing 1, as shown Figure 13 and Figure 14 As shown, the primary filter plate 7 is provided with a primary filter cotton 8, as shown in FIG. Figure 3 and Figure 7 As shown, the primary filter plate 7 is connected to the first fixing frame 6 by a clamping member 9, and the intermediate filter layer 10 includes a second fixing frame 11 and an intermediate filter plate 12. The second fixing frame 11 is welded to the housing 1, as shown in FIG. Figure 15 and Figure 16 As shown, the intermediate filter plate 12 is provided with an intermediate filter cotton 13, and the intermediate filter plate 12 is connected to the second fixing frame 11 through the clamping member 9. The connection structure between the intermediate filter plate 12 and the clamping member 9 is the same as that of the intermediate filter plate 12. Figure 7 The structure is the same as in. Preferably, a sealing strip is further provided at the welding point of the first fixing frame 6 and the shell 1 to seal the gap between the first fixing frame 6 and the shell 1, and a sealing strip is also provided between the primary filter plate 7 and the first fixing frame 6. The sealing strip is fixed at the four edges of each grid of the primary filter plate 7 or the first fixing frame 6. Similarly, a sealing strip is further provided at the welding point of the second fixing frame 11 and the shell 1 to seal the gap between the second fixing frame 11 and the shell 1, and a sealing strip is also provided between the intermediate filter plate 12 and the second fixing frame 11. The sealing strip is fixed at the four edges of each grid of the intermediate filter plate 12 or the second fixing frame 11. The setting of the sealing strip is mainly used to prevent air leakage, which enters the air compressor without being filtered by the primary filter cotton 8 and the intermediate filter cotton 13, which will damage the air compressor in the long run.

[0042] like Figure 9 and Figure 11 As shown, preferably, the first fixing frame 6 and the second fixing frame 11 are both grid-shaped structures, such as Figure 10 and Figure 12As shown, each grid of the first fixing frame 6 is clamped with a primary filter plate 7, and each grid of the second fixing frame 11 is clamped with an intermediate filter plate 12. Preferably, the first fixing frame 6 and the second fixing frame 11 have the same structure, and there are nine grids thereon, and each grid is equipped with an intermediate filter plate 12 or a primary filter plate 7. This is equivalent to disassembling the entire filter layer into multiple small units. The advantage is that when replacing, each filter plate can be replaced in turn. During the replacement process, the filtering capacity of the intermediate filter layer 10 and the primary filter layer 4 does not completely disappear, but the filtering capacity of the replaced grid is lost. However, for the entire filtration system, this situation has little impact on the air compressor. When replacing the intermediate filter plate 12, the intermediate filter plate 12 is also removed from the second fixing frame 11 of the nine-square grid structure, and replaced in sequence, and the filtering capacity of the intermediate filter layer 10 is disassembled into multiple small units. This will not completely eliminate the filtering capacity of the intermediate filter layer 10, but will only weaken the filtering capacity of a small part of the intermediate filter layer 10. However, the flocculent and particulate impurities in the air that are threatening to the air compressor have been filtered by the primary filter layer 4. Even if a small part of the air passes through the grid where the intermediate filter plate 12 is being replaced, the impurities contained therein are at most dust. However, since the dust content in the air itself is relatively low, and the air entering the air compressor is only equivalent to one-ninth of The air contains dust, and the replacement process is very short. The way the card connector 9 is connected can ensure that the replacement process will not exceed ten seconds. Even strictly calculated, the time for a single grid to lose its intermediate filtering ability during the replacement process is only about one or two seconds (because during the removal of the card connector 9, the old intermediate filter plate 12 is still in the grid of the second fixing frame 11 and still performs the filtering function. When the card connector 9 is removed, the worker holds the new one in one hand and removes the old one with the other hand, and then instantly installs the new intermediate filter plate 12 on the second fixing frame 11. The entire replacement process will not exceed 1-2 seconds). Therefore, when replacing the intermediate filter plate 12, it will not affect the overall performance of the equipment. The air filtering capacity can be improved without stopping the operation of the air compressor, which is completely different from the traditional filtering structure and filtering method using a drum filter element. At the same time, the use of the clamping part 9 also greatly shortens the time for replacing the intermediate filter plate 12 and the primary filter plate 7. Preferably, the intermediate filter plate 12 and the primary filter plate 7 are square in shape, and the structure of the first fixing frame 6 and the second fixing frame 11 is square, and there is a nine-square grid structure thereon, that is, there are nine grids on it, and a filter plate (intermediate filter plate 12 or primary filter plate 7) is installed in each grid. The primary filter plate 7 is installed on the first fixing frame 6 to form a primary filter layer 4, and the intermediate filter plate 12 is installed on the second fixing frame 11 to form an intermediate filter layer 10.

[0043] Preferably, the grids of the first and second fixing frames 6 and 11 are both fixedly connected to limit plates 17. The grids of the first and second fixing frames 6 and 11 are further provided with slots 18 located on opposite sides of the limit plates 17. The primary filter plates 7 and the intermediate filter plates 12 are both located between the slots 18 and the limit plates 17. The clips 9 engage the slots 18 to secure the primary filter plates 7 and the intermediate filter plates 12 to the corresponding limit plates 17. Preferably, two primary filter layers 4 are provided, overlapping each other with a spacer between them. The provision of two primary filter layers 4 ensures that when the primary filter plate 7 in one grid of one primary filter layer 4 is replaced, the other primary filter layer 4 continues to filter air. Thus, even if there are impurities such as flocs (e.g., catkins) and soil particles in the air, they will be filtered by the other primary filter layer 4 and the intermediate filter layer 10 and will not directly enter the air compressor.

[0044] like Figure 6 As shown, preferably, an operating room 14 for people to walk in is provided in the shell 1, and the operating room 14 is located between the intermediate filter layer 10 and the primary filter layer 4. A manhole 15 for entering the operating room 14 is provided on the side wall of the shell 1, and an opening and closing door 16 is installed on the manhole 15. Preferably, the manhole 15 is rectangular in shape for people to pass through, and the opening and closing door 16 matches the shape of the manhole 15. The operating room 14 is a rectangular corridor for people to pass through. After the worker enters the operating room 14 through the manhole 15, the primary filter plate 7 on the inner layer of the primary filter layer 4 can be replaced. The outer layer of the primary filter layer 4 is at the air inlet end 3 of the shell 1, that is, the worker can replace it by standing outside the shell 1. Since the air outlet end 2 is provided with an air outlet, and the air outlet is connected to a multi-way valve such as a three-way valve, it is inconvenient for the worker to replace the air at the external air outlet end 2 of the shell 1. The intermediate filter plate 12 is replaced because the air outlet has completely wrapped the intermediate filter layer 10 inside the shell 1. Therefore, through the operating room 14, workers can replace the intermediate filter plate 12 inside the shell 1, which is convenient for operation. Finally, it should be noted that when the equipment is installed and assembled, the operating room 14 is located between the inner primary filter layer 4 and the intermediate filter layer 10, which is equivalent to the intermediate filter layer 10 on one side of the operating room 14 and the primary filter layer 4 on the opposite side. When the intermediate filter layer 10 and the primary filter layer 4 of the filter plate are replaced in the operating room 14, the second fixing frame 11 thereon and the clip 9 installed on the first fixing frame 6 should also be installed on the side close to the operating room 14. The limit plate 17 is installed on the side away from the operating room 14, and the filter plate is installed between the clip 9 and the limit plate 17.

[0045] Preferably, the two primary filter layers 4 are arranged opposite to each other, one inside and one outside, the primary filter plate 7 and the clip 9 on the inner primary filter layer 4 are installed in the operating chamber 14, and the primary filter plate 7 and the clip 9 on the outer primary filter layer 4 are installed at the air inlet end 3 outside the shell 1.

[0046] Preferably, the intermediate filter plate 12 and the clamping member 9 thereon are installed in the operating chamber 14 .

[0047] Preferably, a sealing strip is provided between the primary filter plate 7 and the limiting plate 17 , and a sealing strip is provided between the secondary filter plate 12 and the limiting plate 17 to improve air tightness.

[0048] like Figure 8 As shown, preferably, the air inlet end 3 is provided with a guide plate 19, and the guide plate 19 is fixedly connected to the shell 1. The guide plate 19 can play a role in preventing sand and rainwater. The guide plate 19 is a structure similar to a shutter, with multiple layers stacked up and down, and is installed on the outside of the primary filter layer 4 at a downward angle, so that when the air inlet end 3 takes in air, the air enters the shell 1 from the oblique bottom, reducing the chance of inhaling flocs and particulate impurities, and the air outlet end 2 is provided with an air outlet 20, and the air outlet 20 is connected to the gas pipeline 21. Preferably, the guide plate 19 is rotatably connected to the shell through a pin or a hinge.

[0049] The filtration accuracy of the primary filter cotton 8 on the primary filter layer 4 on the outside of this device is 10 microns, the filtration accuracy of the primary filter cotton 8 on the primary filter layer 4 located on the inside of the shell 1 is 5 microns, the primary filter cotton 8 on the primary filter layer 4 adopts two-centimeter cotton filtration, and the filtration accuracy of the intermediate filter cotton 13 on the intermediate filter layer 10 is 1 micron. The intermediate filter cotton 13 adopts filter bag filtration with a filtration grade of F7. The filtration accuracy of the traditional filter cartridge is only 5-10 microns. The filtration accuracy of this device is much higher than that of the filter cartridge, and the filtration effect is better.

[0050] like Figure 4As shown, preferably, a first pressure gauge 22 and a second pressure gauge 5 are installed on the housing 1 by screws. The first pressure gauge 22 can detect the wind pressure when the air passes through the primary filter layer 4, and the second pressure gauge 5 can detect the wind pressure when the air passes through the intermediate filter layer 10. The setting of the first pressure gauge 22 and the second pressure gauge 5 is extremely important. By observing the parameters of the pressure gauges, the clogging conditions of the primary filter layer 4 and the intermediate filter layer 10 can be known. As the use time increases, the filter layer will inevitably be clogged, but it is not known to what extent the intermediate filter plate 12 and the primary filter plate 7 are clogged, and it is not certain whether they need to be replaced. The setting of the first pressure gauge 22 and the second pressure gauge 5 solves this potential problem. When normal use begins, the display value of the first pressure gauge 22 and the second pressure gauge 5 is 0. When blocked, the pointer parameter will become larger. When it reaches the specified value, it will remind the staff to replace the intermediate filter layer 10 or the primary filter layer 4. It is convenient and practical. The primary filter plate 7 can be used many times. The old one that has been removed can be restored to a better filtering capacity after washing with clean water and can be reused. The intermediate filter plate 12 can be directly replaced with a new one. Preferably, the filtering fineness of the intermediate filter cotton 13 is higher than that of the primary filter cotton 8.

[0051] During operation, air first enters from the air inlet end 3, passes through the primary filter layer 4 for preliminary filtration, and then passes through the intermediate filter layer 10 for fine filtration. Small particles, flocs, soil and other impurities from the outside will be filtered onto the primary filter cotton 8 of the primary filter plate 7. The finer dust and other impurities in the air will pass through the primary filter layer 4 and be filtered out by the intermediate filter layer 10, and remain on the intermediate filter cotton 13 of the intermediate filter plate 12. When replacement is needed, the primary filter plate 7 and the intermediate filter plate 12 can be replaced by disassembling the clamping piece 9, which takes very little time. Since it is connected by the clamping piece 9, the replacement of the intermediate filter plate 12 and the primary filter plate 7 is very convenient and takes very little time. The intermediate filter plate 12 and the primary filter plate 7 can be replaced alternately. When replacing the primary filter plate 7, the intermediate filter plate 12 will take on the All the filtering work, when it is necessary to replace the intermediate filter plate 12, the primary filter plate 7 will also undertake the most basic filtering work, even if a small amount of dust will enter the air compressor with the air during the replacement of the intermediate filter plate 12, but because it takes a very short time, the amount of dust entering the air compressor can be basically ignored, and will not affect the operation and service life of the air compressor. Therefore, compared with traditional technology, the air compressor air filter of this technical solution can realize the filtering function of the air when in use. When alternately replacing the intermediate filter plate 12 and the primary filter plate 7, there is no need to stop the air compressor, and the operation and service life of the air compressor will not be affected by replacing the intermediate filter plate 12 and the primary filter plate 7, which solves the problem of filter blockage at the front air inlet of the air compressor, saves the power loss of the air compressor, and reduces costs.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. That is, any equivalent changes and modifications made according to the content of the patent application of the present invention should fall within the technical scope of the present invention.

Claims

1. An air filter for an air compressor, comprising a housing (1), the housing (1) being provided with an air inlet end (3) and an air outlet end (2), and characterized in that: A primary filter layer (4) and a secondary filter layer (10) are provided in the housing (1), wherein the primary filter layer (4) is located at the air inlet end (3), and the secondary filter layer (10) is located at the air outlet end (2); The primary filter layer (4) includes a first fixing frame (6) and a primary filter plate (7), the first fixing frame (6) is fixedly connected to the housing (1), a primary filter cotton (8) is provided on the primary filter plate (7), and the primary filter plate (7) is clamped to the first fixing frame (6) via a clamping member (9); The intermediate filter layer (10) includes a second fixing frame (11) and an intermediate filter plate (12), the second fixing frame (11) is fixedly connected to the housing (1), the intermediate filter plate (12) is provided with intermediate filter cotton (13), and the intermediate filter plate (12) and the second fixing frame (11) are clamped together by a clamping member (9); An operating room (14) for people to walk in is provided in the housing (1), the operating room (14) is located between the intermediate filter layer (10) and the primary filter layer (4), a manhole (15) for entering the operating room (14) is provided on the side wall of the housing (1), and an opening and closing door (16) is installed on the manhole (15); A first pressure gauge (22) and a second pressure gauge (5) are mounted on the housing (1); the first pressure gauge (22) can detect the wind pressure when the air passes through the primary filter layer (4); and the second pressure gauge (5) can detect the wind pressure when the air passes through the secondary filter layer (10); Two primary filter layers (4) are arranged opposite to each other, one inside and one outside. The primary filter plate (7) and the clamping member (9) on the primary filter layer (4) located on the inside are installed in the operating room (14), and the primary filter plate (7) and the clamping member (9) on the primary filter layer (4) located on the outside are installed at the air inlet end (3) outside the housing (1); The air inlet end (3) is provided with a guide plate (19), the guide plate (19) is fixedly connected to the housing (1), and the air outlet end (2) is provided with an air outlet hole (20), and the air outlet hole (20) is connected to a gas pipeline (21); The guide plate (19) can play a role in preventing sand and rainwater. The guide plate (19) is a shutter structure, with multiple layers of plates stacked up and down, and is installed on the outside of the primary filter layer (4) in a downward tilt, so that when the air inlet end (3) enters the shell (1) from the oblique bottom, reducing the chance of inhaling flocs and particulate impurities.

2. The air filter for an air compressor according to claim 1, characterized in that: The first fixing frame (6) and the second fixing frame (11) are both grid-shaped structures, each grid of the first fixing frame (6) is clamped with a primary filter plate (7), and each grid of the second fixing frame (11) is clamped with a secondary filter plate (12).

3. The air filter for an air compressor according to claim 2, characterized in that: There are two primary filter layers (4), the two primary filter layers (4) are overlapped and a gap is provided between the two primary filter layers (4).

4. The air filter for an air compressor according to claim 1, characterized in that: The grids of the first fixing frame (6) and the second fixing frame (11) are fixedly connected to the limiting plates (17). The grids of the first fixing frame (6) and the second fixing frame (11) are further provided with card slots (18), the card slots (18) are located on the opposite side of the limiting plates (17), the primary filter plates (7) and the intermediate filter plates (12) are both located between the card slots (18) and the limiting plates (17), and the card connectors (9) are inserted into the card slots (18) to fix the primary filter plates (7) and the intermediate filter plates (12) to the corresponding limiting plates (17).

5. The air filter for an air compressor according to claim 1, characterized in that: The intermediate filter plate (12) and the clamping member (9) thereon are installed in the operating room (14).

6. The air filter for an air compressor according to claim 1, characterized in that: A sealing strip is provided between the primary filter plate (7) and the limiting plate (17), and a sealing strip is provided between the secondary filter plate (12) and the limiting plate (17).

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