CN221279623U - High-pressure self-cleaner - Google Patents

Abstract

The application relates to the field of air purification, in particular to a high-pressure self-cleaner, which aims to solve the problem that a filter screen is easy to damage caused by direct impact of high-speed moving air flow; a centrifugal fan is arranged in the box body, a main filter is arranged at the air outlet end of the centrifugal fan, and the centrifugal fan drives air to pass through the main filter; the box body is internally provided with a wind equalizing assembly, the wind equalizing assembly comprises a first flow equalizing plate, and the first flow equalizing plate is arranged between the centrifugal fan and the main filter. The application has the effect of prolonging the service life of the filter screen.

Description

High-pressure self-cleaner

Technical Field

The application relates to the field of air purification, in particular to a high-pressure self-cleaner.

Background

The air purifier is an electric product for purifying indoor air, and can remove dust, bacteria, viruses, harmful gases and other pollutants in the air through the internal mechanical filtering system and air permeation exchange, so that the concentration of the harmful substances in the air is reduced, and the effect of purifying the air is achieved. When a temporary closed place needs to be quickly purified, a high-power fan is generally adopted to drive air flow so as to accelerate the purification efficiency.

In order to obtain high purification efficiency, the resistance of the filter screen of the mechanical filter system is large. The high-speed moving air flow directly impacts the filter screen, so that the filter screen is easy to damage, frequent replacement is needed, and the purification cost of the high-pressure purifier is increased, so that the high-pressure purifier needs to be improved.

Disclosure of utility model

In order to prevent air flow from directly impacting the filter screen and prolong the service life of the filter screen, the application provides a high-pressure self-cleaner.

The high-pressure self-cleaner provided by the application adopts the following technical scheme:

The high-pressure self-cleaner comprises a box body, wherein an air inlet is formed in the side wall of the box body, and a prefilter assembly is arranged on the side wall of the box body and positioned at the air inlet; a centrifugal fan is arranged in the box body, a main filter is arranged at the air outlet end of the centrifugal fan, and the centrifugal fan drives air to pass through the main filter; the box body is internally provided with a wind equalizing assembly, the wind equalizing assembly comprises a first flow equalizing plate, and the first flow equalizing plate is arranged between the centrifugal fan and the main filter.

Through adopting above-mentioned technical scheme, operating personnel shifts the box to the space that needs the purification in, starts centrifugal fan. The centrifugal fan sucks external air into an air inlet area through the prefilter assembly, drives air flow to be sent into an air equalizing area through the first air equalizing plate, and the high-speed air flow is uniformly mixed by the first air equalizing plate and is guided to the main filter; then the air enters an air supply area after being filtered by a main filter; the purified air flow leaves the box body through the air homogenizing component, and the air homogenizing component guides the air flow to blow out in the direction so as to form air circulation in the space to be purified. The setting of first uniform air plate can avoid high-speed air current to directly strike on the filter screen of main filter, prolongs the life of filter screen, reduces the use cost that high pressure filter produced because of frequently changing the filter screen.

Optionally, the first flow equalizing plate is formed by splicing two punching flow equalizing plates, and an included angle between the two punching flow equalizing plates is an obtuse angle.

Through adopting above-mentioned technical scheme, after the air current passed two and punched the flow equalizing board, by even direction to perpendicular to two and punched the flow equalizing board, avoid directly striking the filter screen of main filter. The service life of the filter screen is prolonged, and the use cost of the high-pressure filter caused by frequent replacement of the filter screen is reduced.

Optionally, the air equalizing component further comprises a second flow equalizing plate, an air outlet is formed in the top wall of the box body, and the second flow equalizing plate is arranged on the top wall of the box body and located at the air outlet; the second flow equalizing plate is horizontally arranged.

Through adopting above-mentioned technical scheme, under the guide of second flow equalizing board, the air current blows out the box along the vertical upward of the direction of perpendicular to second flow equalizing board, forms air cycle in the airtight space that needs purifying for the purification rate.

Optionally, two air inlets are formed in the side wall of the box body, the prefilter assembly comprises two prefilter pieces, and one prefilter piece is mounted at each air inlet; the centrifugal fan is arranged on the bottom plate of the box body, and the projection of the centrifugal fan on the side plate of the box body is positioned between the two air inlets.

Through adopting above-mentioned technical scheme, outside air gets into the box after the primary filtration of two prefilters, is inhaled centrifugal fan from centrifugal fan's both sides, avoids the air current to strike on centrifugal fan's shell, leads to outside air to be bounced, air current disorder after getting into the box, improves centrifugal fan's induced draft efficiency.

Optionally, the pre-filtering piece comprises a mounting frame, a filtering material and a rubber gasket, a rectangular annular groove is formed in the side wall of the mounting frame far away from the central opening, and the rubber gasket can be placed in the rectangular annular groove; the filter material cage is covered on the side wall of the mounting frame far away from the rectangular annular groove, the part of the filter material protruding out of the edge of the mounting frame can bypass the outer side wall of the mounting frame and is attached to the side wall of the mounting frame close to the rectangular annular groove, the part of the filter material bypassing the outer side wall of the mounting frame is pressed into the rectangular annular groove by the rubber gasket, and the filter material can be abutted against the inner wall of the rectangular annular groove by the rubber gasket; the side wall of the rubber gasket can be propped against the outer side wall of the box body; the mounting frame is detachably connected with the box body through the mounting assembly.

Through adopting above-mentioned technical scheme, operating personnel establishes clean filter material cover in the one side that the rectangle annular was kept away from to the installing frame, turns over the part of filter material outstanding installing frame edge. An operator controls the rubber gasket to tightly prop the filter material on the inner wall of the rectangular ring groove, and the filter material cannot be separated under the action of static friction force. After the prefilter is installed, an operator installs the installation frame on the box body through the installation assembly, and the rubber gasket is pressed on the outer side wall of the box body by the installation frame. When the purification is finished and the prefilter needs to be replaced, an operator takes down the mounting frame, takes down the rubber gasket, and can reuse the filter material after cleaning and drying. The arrangement of the rubber gasket and the rectangular ring groove realizes the rapid installation and disassembly of the filter material and improves the installation efficiency; and the rubber gasket is low in cost, so that the manufacturing cost of equipment is reduced.

Optionally, the mounting assembly comprises a plurality of buckle plates and a plurality of buckle rings, the buckle rings are mounted on the inner side wall of the box body and close to the air inlet, and the central opening of the buckle rings is communicated with the air inlet; the buckle plate is arranged on the inner peripheral wall of the mounting frame, one end of the buckle plate is connected with the mounting frame, and the other end of the buckle plate can penetrate through the central opening of the buckle ring and protrudes out of the end wall of the buckle ring; the buckle passes the one end of buckle and is provided with the step, the buckle is kept away from the end wall slope setting of installing frame.

Through adopting above-mentioned technical scheme, operating personnel aim at the buckle with the buckle, insert the buckle behind the buckle respectively earlier with the pointed end of buckle, press the installing frame again, make the buckle take place elastic deformation and snap into the buckle after recovering. When the prefilter needs to be removed, an operator controls the mounting frame to horizontally and slightly move leftwards to slightly deform the left buckle plate, and the step of the right buckle plate is not attached to the buckle ring; the mounting frame is controlled to move in a direction away from the box body, and the right buckle plate is separated from the buckle ring; and controlling the mounting frame to move to the right side, so that the left buckle plate is separated from the buckle ring, and the mounting frame is dismounted. The mounting and dismounting processes of the mounting frame are simple and quick, and the mounting efficiency is improved; and the cost of the plastic part is low, so that the manufacturing cost of the equipment is reduced.

Optionally, the main filter comprises two main filter pieces, and the two main filter pieces are arranged in parallel; the main filter piece comprises a plurality of filter screens, and the filter screens are overlapped along the vertical direction.

By adopting the technical scheme, the overlapping arrangement of the filter screens can improve the air purifying effect; the whole large filter screen is replaced by two small filter screens which are arranged in parallel, and even if a part of the filter screen is damaged, only one small filter screen at the damaged part is required to be replaced, and the other small filter screen can be normally used; the use cost of the high-pressure filter caused by frequent replacement of the filter screen is reduced.

Optionally, an inspection port is formed in the side plate of the box body, far away from the prefilter assembly, an inspection door is arranged on the box body, and the inspection door is arranged on the side wall of the side plate of the box body, close to the inspection port; the side wall of the inspection door far away from the box body is provided with a handle.

By adopting the technical scheme, when the main filter or the centrifugal fan is required to be overhauled, an operator holds the handle and rotates the hinge plate to take down the inspection door for overhauling or replacing; after the operation is finished, the inspection door is returned. The operation is convenient, improves the efficiency of installation and maintenance.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The operator transfers the box to the space to be purified, and starts the centrifugal fan. The centrifugal fan sucks external air into an air inlet area through the prefilter assembly, drives air flow to be sent into an air equalizing area through the first air equalizing plate, and the high-speed air flow is uniformly mixed by the first air equalizing plate and is guided to the main filter; then the air enters an air supply area after being filtered by a main filter; the purified air flow leaves the box body through the air homogenizing component, and the air homogenizing component guides the air flow to blow out in the direction so as to form air circulation in the space to be purified. The arrangement of the first air equalizing plate can prevent high-speed air flow from directly impacting the filter screen of the main filter, prolong the service life of the filter screen and reduce the use cost of the high-pressure filter caused by frequent replacement of the filter screen;

2. Under the guidance of the second flow equalizing plate, the air flow vertically upwards blows out of the box body along the direction vertical to the second flow equalizing plate, and air circulation is formed in the closed space to be purified, so that the purifying speed is increased;

3. The operator covers the clean filter material on one side of the mounting frame far away from the rectangular ring groove, and turns over the part of the filter material protruding out of the edge of the mounting frame. An operator controls the rubber gasket to tightly prop the filter material on the inner wall of the rectangular ring groove, and the filter material cannot be separated under the action of static friction force. After the prefilter is installed, an operator installs the installation frame on the box body through the installation assembly, and the rubber gasket is pressed on the outer side wall of the box body by the installation frame. When the purification is finished and the prefilter needs to be replaced, an operator takes down the mounting frame, takes down the rubber gasket, and can reuse the filter material after cleaning and drying. The arrangement of the rubber gasket and the rectangular ring groove realizes the rapid installation and disassembly of the filter material and improves the installation efficiency; and the rubber gasket is low in cost, so that the manufacturing cost of equipment is reduced.

Drawings

Fig. 1 is a schematic view of a high pressure purifier according to an embodiment of the present application.

Fig. 2 is a cross-sectional view showing an internal structure of the high pressure cleaner according to the embodiment of the present application.

Fig. 3 is an exploded view of an embodiment of the present application to embody the structure of the prefilter assembly.

Fig. 4 is an exploded view of an embodiment of the present application to embody the structure of the mounting assembly.

FIG. 5 is a cross-sectional view of an embodiment of the present application to illustrate the structure of a wind-leveling assembly.

Fig. 6 is an enlarged view of a in fig. 2.

Reference numerals illustrate: 1. a case; 11. an air inlet; 12. an air outlet; 13. a first partition plate; 131. a first through hole; 14. a second partition plate; 141. a second through hole; 15. an air inlet area; 16. a wind equalizing area; 17. an air outlet area; 2. a prefilter assembly; 21. a pre-filter; 211. a mounting frame; 2111. rectangular ring grooves; 212. a filter material; 213. a rubber gasket; 3. a mounting assembly; 31. a buckle plate; 311. a step; 32. a clasp ring; 4. a centrifugal fan; 5. a soft air pipe; 51. a first flange; 52. a second flange; 6. a main filter; 61. a main filter; 611. a filter screen; 7. a wind equalizing component; 71. a first flow equalizing plate; 711. punching a flow equalizing plate; 72. a second flow equalizing plate; 8. checking a door; 81. a handle.

Detailed Description

The application is described in further detail below with reference to fig. 1-6.

The embodiment of the application discloses a high-voltage self-cleaner. Referring to fig. 1 and 2, the high-pressure self-cleaner includes a case 1, and the case 1 is placed on the ground. The bottom of the side plate of the box body 1 is provided with an air inlet 11, and the top plate of the box body 1 is provided with an air outlet 12. The first isolation plate 13 and the second isolation plate 14 are arranged in the box body 1 from bottom to top, an air inlet area 15 is arranged between the bottom plate of the box body 1 and the first isolation plate 13, an air equalizing area 16 is arranged between the first isolation plate 13 and the second isolation plate 14, and an air outlet area 17 is arranged between the second isolation plate 14 and the top plate of the box body 1. The first isolation plate 13 is provided with a first through hole 131, and the air inlet area 15 and the air homogenizing area 16 are communicated through the first through hole 131; the second isolation plate 14 is provided with a second through hole 141, and the air equalizing area 16 and the air outlet area 17 are communicated through the second through hole 141.

The side wall of the box body 1, which is positioned at the air inlet 11, is provided with a prefilter assembly 2, and outside air enters an air inlet area 15 through the prefilter assembly 2. The air inlet area 15 is internally provided with a centrifugal fan 4, the centrifugal fan 4 is arranged on the bottom plate of the box body 1 through bolts, and the air outlet end of the centrifugal fan 4 is communicated with the air homogenizing area 16. The main filter 6 is installed in the air outlet area 17, the main filter 6 is installed on the second isolation plate 14 and covers the second through holes 141, and air in the air equalizing area 16 enters the air outlet area 17 after being filtered by the main filter 6. The box 1 is also internally provided with a uniform air component 7, and the uniform air component 7 is arranged in a uniform air area 16 and an air outlet area 17 so as to uniformly blow the air flow of the centrifugal fan 4 to the main filter 6 and send out the air flow of the box 1.

The operator transfers the tank 1 into the space to be cleaned and starts the centrifugal fan 4. The centrifugal fan 4 sucks outside air into the air inlet area 15 through the prefilter assembly 2 and drives air flow to be sent into the air homogenizing area 16 through the air homogenizing assembly 7, and the air flow is uniformly mixed by the air homogenizing assembly 7; then enters the air supply area after being filtered by the main filter 6; the purified air flow leaves the box body 1 through the air homogenizing component 7, and the air homogenizing component 7 guides the air flow to blow out so as to form air circulation in the space needing to be purified.

Referring to fig. 3 and 4, in order to reduce the amount of external air that is bounced after entering the case 1, the number of air inlets 11 is two, two air inlets 11 are arranged side by side, and the projection of the centrifugal fan 4 on the side plate of the case 1 is located between the two air inlets 11. The prefilter assembly 2 comprises two prefilters 21, each prefilter 21 housing one air outlet 12. The prefilter 21 includes a mounting frame 211, the outer edge length of the mounting frame 211 being greater than the edge length of the air outlet 12, and the inner edge length of the mounting frame 211 being less than the edge length of the air outlet 12. The side wall of the mounting frame 211, which is close to the box body 1, is provided with a rectangular ring groove 2111, a rubber gasket 213 is inserted in the rectangular ring groove 2111, and the rubber gasket 213 can be in interference fit with the rectangular ring groove 2111. The filter material 212 is covered on the mounting frame 211, and in this embodiment, the filter material 212 is a non-woven fabric, and the side length of the filter material 212 is greater than the outer edge length of the mounting frame 211. The filter material 212 is covered on the side wall of the installation frame 211 facing away from the box body 1, and the part of the filter material 212 protruding out of the edge of the installation frame 211 can bypass from the outer side wall of the installation frame 211 and is erected on the side wall of the installation frame 211 close to the rectangular ring groove 2111. The rubber gasket 213 presses the filter material 212 into the rectangular ring groove 2111 around the outer side wall of the mounting frame 211, and abuts the filter material 212 against the inner wall of the rectangular ring groove 2111, so that the filter material 212 cannot escape from the rectangular ring groove 2111 under the action of static friction force; the rubber gasket 213 protrudes from the mounting frame 211 away from the side wall of the mounting frame 211, and can be attached to the outer side wall of the case 1.

In order to achieve a detachable connection of the pre-filter 21 to the tank 1, the pre-filter 21 is mounted to the tank 1 by means of the mounting assembly 3. The mounting assembly 3 comprises a retaining ring 32, the retaining ring 32 is mounted on the inner side wall of the box body 1 near the air inlet 11 through bolts, and the projection of the central opening of the retaining ring 32 on the side plate of the box body 1 is positioned in the air inlet 11. In this embodiment, ten buckles 32 are disposed on the side wall of each air inlet 11 of the case 1 along the circumferential direction of the air inlet 11, eight buckles are disposed longitudinally, and two buckles are disposed transversely. The mounting assembly 3 further includes a gusset 31, the gusset 31 is mounted on an inner peripheral wall of the mounting frame 211 by bolts, and ten gusset 31 are provided on each mounting frame 211 in the circumferential direction. The end of the clip 31 remote from the mounting frame 211 can pass through the central opening of the clasp 32. One end of the buckle plate 31 penetrating through the buckle ring 32 is provided with a step 311, and the side wall of the buckle plate 31, which is close to the mounting frame 211, can be abutted against the side wall of the buckle ring 32, which is far away from the box body 1. The buckle 31 is disposed away from the end wall of the mounting frame 211 in an inclined manner to assist the buckle 31 in being engaged with the buckle 32. In this embodiment, the buckle 32 and the buckle 31 are made of flexible materials, and have elastic deformation capability.

Before starting the high-pressure self-cleaner, an operator firstly covers the clean filter material 212 on one side of the installation frame 211 far away from the rectangular ring groove 2111, and turns over the part of the filter material 212 protruding out of the edge of the installation frame 211 from the outer side of the installation frame 211 to the direction close to the inner wall of the rectangular ring groove 2111, and the edge part of the filter material 212 is erected on two sides of the rectangular ring groove 2111. An operator controls the rubber gasket 213 to press the filter material 212 against the inner wall of the rectangular ring groove 2111, and the filter material 212 cannot be separated under the action of static friction force; at this time, the side wall of the rubber grommet 213 protrudes out of the rectangular ring groove 2111. The pre-filter 21 is installed. The operator aligns the buckle plate 31 with the buckle ring 32, inserts the tips of the buckle plate 31 into the buckle ring 32, presses the mounting frame 211, and enables the buckle plate 31 to elastically deform and clamp into the buckle ring 32 to recover. At this time, the rubber gasket 213 is pressed against the outer sidewall of the case 1 by the mounting frame 211.

When the purification is completed and the pre-filter 21 needs to be replaced, an operator controls the mounting frame 211 to slightly move horizontally leftwards to slightly deform the left buckle plate 31, and the step 311 of the right buckle plate 31 is not attached to the buckle ring 32; the mounting frame 211 is controlled to move away from the box body 1, and the right pinch plate 31 is separated from the retaining ring 32; the mounting frame 211 is controlled to move rightward, so that the left buckle 31 is separated from the buckle 32, and the mounting frame 211 is completely detached. The operator removes the rubber gasket 213, cleans and dries the filter material 212, and then re-uses it.

Referring to fig. 4, two inspection ports 13 are formed in a side plate of the box 1, which is away from the air inlet 11, and an inspection door 8 is mounted on the box 1 at the inspection port 13. The inspection door 8 is detachably connected with the box body 1 through a hinge plate, and the hinge plate is rotatably connected with the box body 1 through a hinge. A handle 81 is mounted on the side wall of the inspection door 8 remote from the cabinet 1 for the operator to hold.

When the main filter 6 or the centrifugal fan 4 is required to be overhauled, an operator holds the handle 81 and rotates the hinge plate to take down the inspection door 8 for overhauling or replacing; after the operation is finished, the inspection door 8 is returned.

Referring to fig. 5 and 6, after entering the air intake area 15, the outside air is sucked into the centrifugal fan 4 from both sides of the centrifugal fan 4 and exits from the air outlet end above the centrifugal fan 4. The air outlet end of the centrifugal fan 4 is provided with a soft air pipe 5, and the soft air pipe 5 is connected with the centrifugal fan 4 through a flange; one end of the soft air pipe 5, which is far away from the centrifugal fan 4, passes through the first through hole 131 and is connected with the first isolation plate 13 through a flange. The air outlet end of the centrifugal fan 4 is communicated with the air equalizing area 16 through the soft air pipe 5. The air flow passes through the soft air pipe 5 and then enters the air equalizing area 16, and the soft air pipe 5 can converge the air flow and reduce noise.

In order to prevent high-speed air flow passing through the soft air pipe 5 from directly impacting the main filter 6, an air equalizing component 7 is arranged in the air equalizing area 16, the air equalizing component 7 comprises a first flow equalizing plate 71, and the first flow equalizing plate 71 is mounted on the inner wall of the soft air pipe 5 protruding out of one end of the first isolation plate 13 through gluing. The first current-equalizing plate 71 is formed by splicing two punching current-equalizing plates 711 by gluing, and the included angle between the two punching current-equalizing plates 711 is an obtuse angle. After passing through the two punching flow-equalizing plates 711, the air flow is uniformly guided to a direction perpendicular to the two punching flow-equalizing plates 711.

The main filter 6 comprises two main filter pieces 61, two second through holes 141 are formed in the second isolation plate 14, and the two main filter pieces 61 are respectively arranged on the second isolation plate 14 at the second through holes 141 through bolts and are arranged in parallel. The main filter 61 includes three layers of filter screens 611, and the three layers of filter screens 611 are overlapped in the vertical direction and are connected by bolts.

The air flow passes through the three layers of filter screens 611 and then enters the air outlet area 17, and in order to guide the direction of the air flow, the air equalizing assembly 7 further comprises a second flow equalizing plate 72, where the second flow equalizing plate 72 is a flat plate punching plate. The second flow equalizing plate 72 is mounted on the top wall of the box body 1 at the air outlet 12 by gluing, and the second flow equalizing plate 72 is horizontally arranged. Under the guidance of the second flow equalizing plate 72, the air flow vertically blows out of the box body 1 upwards along the direction perpendicular to the second flow equalizing plate 72, and air circulation is formed in the closed space, so that the purification speed is increased.

The implementation principle of the high-pressure self-cleaner of the embodiment of the application is as follows: the operator installs clean filter material 212 on the installation frame 211 through the rubber gasket 213, and then clamps the buckle plate 31 in the buckle ring 32, so that the filter material 212 covers the air inlet 11. The operator transfers the tank 1 into the space to be cleaned and starts the centrifugal fan 4. The centrifugal fan 4 sucks the external air into the air inlet area 15 through the preliminary filtration of the filter material 211, and drives the air flow to be sent into the air equalizing area 16 through the convergence of the soft air pipe 5 and the guiding of the first air equalizing plate 71; then enters the air outlet area 17 after being filtered by the main filter 6; the purified air flow is guided by the second air equalizing plate 72 to leave the box body 1, and air circulation is formed in the space to be purified. So as to achieve the effect of quickly purifying the air and prolonging the service life of the main filter.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (9)

1. The utility model provides a high pressure self-cleaning ware which characterized in that: the filter comprises a box body (1), wherein an air inlet (11) is formed in the side wall of the box body (1), and a prefilter assembly (2) is arranged on the side wall of the box body (1) and positioned at the air inlet (11); a centrifugal fan (4) is arranged in the box body (1), a main filter (6) is arranged at the air outlet end of the centrifugal fan (4), and the centrifugal fan (4) drives air to pass through the main filter (6); the novel centrifugal fan is characterized in that a uniform air component (7) is further arranged in the box body (1), the uniform air component (7) comprises a first uniform air plate (71), and the first uniform air plate (71) is arranged between the centrifugal fan (4) and the main filter (6).

2. The high pressure self-cleaner of claim 1, wherein: the first flow equalizing plates (71) are formed by splicing two punching flow equalizing plates (711), and an included angle between the two punching flow equalizing plates (711) is an obtuse angle.

3. The high pressure self-cleaner of claim 1, wherein: the air equalizing component (7) further comprises a second flow equalizing plate (72), an air outlet (12) is formed in the top wall of the box body (1), and the second flow equalizing plate (72) is arranged on the top wall of the box body (1) and is positioned at the air outlet (12); the second flow equalizing plate (72) is horizontally arranged.

4. The high pressure self-cleaner of claim 2, wherein: the air outlet end of the centrifugal fan (4) is provided with a soft air pipe (5), one end of the soft air pipe (5) is connected with the centrifugal fan (4), and the other end of the soft air pipe is connected with the first flow equalizing plate (71).

5. The high pressure self-cleaner of claim 1, wherein: two air inlets (11) are formed in the side wall of the box body (1), the prefilter assembly (2) comprises two prefilter pieces (21), and one prefilter piece (21) is arranged at each air inlet (11); the centrifugal fan (4) is arranged on the bottom plate of the box body (1), and the projection of the centrifugal fan (4) on the side plate of the box body (1) is positioned between the two air inlets (11).

6. The high pressure self-cleaner of claim 5, wherein: the pre-filtering piece (21) comprises a mounting frame (211), a filtering material (212) and a rubber gasket (213), wherein a rectangular ring groove (2111) is formed in the side wall of the mounting frame (211) far away from the central opening, and the rubber gasket (213) can be placed in the rectangular ring groove (2111); the filter material (212) is covered on the side wall of the mounting frame (211) far away from the rectangular ring groove (2111), the part of the filter material (212) protruding out of the edge of the mounting frame (211) can bypass the outer side wall of the mounting frame (211) and is attached to the side wall of the mounting frame (211) close to the rectangular ring groove (2111), the rubber gasket (213) presses the part of the filter material (212) bypassing the outer side wall of the mounting frame (211) into the rectangular ring groove (2111), and the rubber gasket (213) can press the filter material (212) against the inner wall of the rectangular ring groove (2111); the side wall of the rubber gasket (213) can be propped against the outer side wall of the box body (1); the mounting frame (211) is detachably connected with the box body (1) through the mounting assembly (3).

7. The high pressure self-cleaner of claim 6, wherein: the mounting assembly (3) comprises a plurality of buckle plates (31) and a plurality of buckle rings (32), the buckle rings (32) are mounted on the inner side wall of the box body (1) and close to the air inlet (11), and the central opening of each buckle ring (32) is communicated with the air inlet (11); the buckle plate (31) is arranged on the inner peripheral wall of the mounting frame (211), one end of the buckle plate (31) is connected with the mounting frame (211), and the other end of the buckle plate can penetrate through the central opening of the buckle ring (32) and protrudes out of the end wall of the buckle ring (32); one end of the buckle plate (31) penetrating through the buckle ring (32) is provided with a step (311), and the end wall of the buckle plate (31) far away from the mounting frame (211) is obliquely arranged.

8. The high pressure self-cleaner of claim 1, wherein: the main filter (6) comprises two main filter elements (61), and the two main filter elements (61) are arranged in parallel; the main filter (61) comprises a plurality of filter screens (611), and the filter screens (611) are overlapped along the vertical direction.

9. The high pressure self-cleaner of claim 1, wherein: an inspection opening (13) is formed in a side plate of the box body (1) far away from the prefilter assembly (2), an inspection door (8) is arranged on the box body (1), and the inspection door (8) is arranged on the side wall, close to the inspection opening (13), of the side plate of the box body (1); the side wall of the inspection door (8) far away from the box body (1) is provided with a handle (81).