Filter

Abstract

The utility model discloses a filter which is characterized in that the filter comprises a bin body with a cavity inside, a partition plate is arranged in the middle of the cavity and divides the cavity into an upper cavity and a lower cavity, and an air outlet communicated with the bottom of the lower cavity is formed in the bottom of the bin body; an air inlet pipe is installed on the bin body, one end of the air inlet pipe is arranged outside the bin body, and the other end of the air inlet pipe is inserted into the lower cavity and connected with the middle of the bottom face of the partition plate. A connecting hole position is formed in the middle of the partition plate, the two ends of the connecting hole position communicate with the upper cavity and the air inlet pipe correspondingly, and a filtering assembly is installed on the portion, above the connecting hole position, of the partition plate; a plurality of through holes are formed in a partition plate between the connecting hole site and the inner surface of the cavity, and the upper cavity is communicated with the lower cavity through the through holes. The filtering quality is improved, the use stability and the service life of the vacuum pump are prolonged, and the maintenance rate is reduced.

Description

Technical Field

[0001] The utility model relates to the field of vacuum technology, in particular to a filter. Background Art

[0002] A vacuum pump is a device or equipment that uses mechanical, physical, chemical or physicochemical methods to evacuate the container to obtain a vacuum. In layman's terms, a vacuum pump is a device that uses various methods to improve, generate and maintain a vacuum in a closed space.

[0003] In many cases, the working environment of the vacuum pump is relatively harsh. For example, the vacuum pump environment has more particulate matter, such as dust, impurities, etc. Under normal circumstances, a filter is directly set at the air inlet of the vacuum pump for filtering. However, in this way, the filter is easily blocked and needs to be frequently disassembled and cleaned, which is inconvenient. At the same time, a single filter may cause a lot of impurities to enter the vacuum pump, causing damage to the vacuum pump, affecting the service life of the vacuum pump, and resulting in a high maintenance rate of the vacuum pump. Therefore, how to quickly and efficiently filter the impurities entering the vacuum pump in advance is a direction that technicians in this field need to work on. Summary of the invention

[0004] The utility model aims to provide a filter, by using the structure, the service life of the vacuum pump can be effectively prolonged and the maintenance rate of the vacuum pump can be reduced.

[0005] To achieve the above object, the technical solution adopted by the utility model is: a filter, comprising a chamber body having a chamber inside, a partition is provided in the middle of the chamber, the partition divides the chamber into an upper chamber and a lower chamber, and an air outlet is provided at the bottom of the chamber body and communicated with the bottom of the lower chamber;

[0006] An air inlet pipe is installed on the warehouse body, one end of the air inlet pipe is arranged outside the warehouse body, and the other end of the air inlet pipe is inserted into the lower chamber and connected to the middle part of the bottom surface of the partition;

[0007] A connecting hole is provided in the middle of the partition, and the two ends of the connecting hole respectively connect the upper chamber and the air intake pipe, and a filter assembly is installed on the partition above the connecting hole;

[0008] A plurality of through holes are provided on the partition between the connection hole and the inner surface of the chamber, and the through holes connect the upper chamber with the lower chamber.

[0009] In the above technical solution, the filter assembly includes a cylinder and at least one filter screen, the cylinder is provided with a cavity with two ends passing through, the filter screen is installed in the cavity, and the filter screen is provided with a plurality of filter holes;

[0010] The bottom of the cylinder is connected to the top surface of the partition, and the cavity and the filter are arranged directly above the connection hole.

[0011] In the above technical solution, the filter screens are at least two pieces, the filter hole diameter of the lower filter screen is larger than the filter hole diameter of the adjacent upper filter screen, and the number of filter holes on the lower filter screen is less than the number of filter holes on the adjacent upper filter screen.

[0012] In the above technical solution, an inwardly extending extension ring is provided on the inner surface of the bottom of the cylinder, the bottom of the extension ring abuts against the top surface of the partition, and the extension ring is connected to the partition via connecting bolts.

[0013] In the above technical solution, the cylinder includes at least two sleeves, a plurality of limiting screw holes are arranged on the top surface of the bottom sleeve, and a plurality of through holes are arranged on the other sleeves, and each through hole is arranged opposite to one of the limiting screw holes;

[0014] The outer edge of each filter is arranged between adjacent sleeves, and a limiting bolt is inserted into each through hole, the bottom of the limiting bolt passes through the outer edge of the corresponding filter and is screwed to one of the limiting screw holes, and the bottom of the bottommost sleeve is connected to the top of the partition;

[0015] And / or, an extension ring extending inward is provided on the bottom inner surface of the bottom sleeve, the bottom of the extension ring abuts against the top surface of the partition, and the extension ring is connected to the partition via connecting bolts.

[0016] In the above technical solution, the outer edge of each filter is installed on a steel ring, the steel ring is arranged between adjacent sleeves, and a plurality of mounting holes are arranged on the steel ring, each mounting hole is arranged opposite to one of the through holes, and the bottom of the limiting bolt passes through the through hole and the mounting hole and is screwed to one of the limiting screw holes.

[0017] In the above technical solution, the middle outer surface of the air inlet pipe is sealed to the chamber body, the inner end of the air inlet pipe is arranged in the lower chamber, and the top outer surface of the air inlet pipe is sealed to the inner wall of the connection hole;

[0018] The outer end of the air inlet pipe is arranged outside the warehouse body, and a trumpet-shaped connecting pipe is installed on the outer end of the air inlet pipe.

[0019] In the above technical solution, the warehouse body includes a lower warehouse body and an upper warehouse body, and the bottom outer edge of the upper warehouse body is detachably connected to the top outer edge of the lower warehouse body;

[0020] The partition is arranged on the top of the lower warehouse body, the upper chamber is arranged in the upper warehouse body, and the lower chamber is arranged in the lower warehouse body.

[0021] In the above technical solution, the filter assembly is arranged in the upper chamber, and the middle part of the air inlet pipe is connected to the middle part of the lower warehouse body.

[0022] In the above technical solution, a back-blowing port is further provided on the top of the warehouse body, and the back-blowing port is arranged directly above the filter assembly. A seal or switch for opening and closing the back-blowing port is also provided on the top of the warehouse body.

[0023] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0024] 1. A special filter screen is provided in the utility model. After the gas is filtered from bottom to top through the filter assembly through the air inlet pipe, the filtered gas is sent downward from the side of the filter assembly, which can effectively improve the filtering efficiency and at the same time extend and change the flow trajectory of the gas, so that the internal particulate impurities are filtered or settled in advance as much as possible, effectively improving the filtering effect, and preventing particulate impurities from entering the vacuum pump as much as possible, extending the service life of the vacuum pump, ensuring the stability of the vacuum pump operation, and reducing the maintenance rate of the vacuum pump;

[0025] 2. The utility model is also provided with a back-blowing port, which can quickly back-blow the filter, so that impurities such as particles can be quickly cleaned from the filter without manual cleaning, thus reducing the maintenance rate and ensuring the filtering quality;

[0026] 3. The aperture of the filter holes of the lower filter screen in the utility model is smaller than that of the filter holes of the upper filter screen, so that impurities can be filtered separately, the filtering effect can be improved, and the clogging time of the filter screen can be extended, so as to ensure the use time of the filter screen and reduce the cleaning frequency;

[0027] 4. The cylinder in the filter assembly of the utility model adopts a segmented structure, so that different numbers of filter screens can be selected according to different occasions, thereby improving the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the first embodiment of the present utility model;

[0029] Figure 2 It is a schematic cross-sectional view of the structure of the first embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the structure of the lower bin body in the first embodiment of the utility model;

[0031] Figure 4It is a structural schematic diagram of the filter assembly in the first embodiment of the utility model;

[0032] Figure 5 It is a schematic cross-sectional structural diagram of the filter assembly in the first embodiment of the present utility model.

[0033] Among them: 1. warehouse body; 2. partition; 3. lower chamber; 4. lower chamber; 5. air outlet; 6. air inlet pipe; 7. connection hole; 8. filter assembly; 9. through hole; 10. cylinder body; 11. filter screen; 12. cavity; 13. filter hole; 14. extension ring; 15. connecting bolt; 16. sleeve; 17. limit bolt; 18. trumpet-shaped connecting pipe; 19. lower warehouse body; 20. upper warehouse body. DETAILED DESCRIPTION

[0034] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0035] Example 1: See Figures 1 to 5 As shown, a filter comprises a housing 1 having a chamber therein, a partition 2 is provided in the middle of the chamber, the partition 2 divides the chamber into an upper chamber 3 and a lower chamber 4, and an air outlet 5 communicating with the bottom of the lower chamber 3 is provided at the bottom of the housing 1;

[0036] An air inlet pipe 6 is installed on the warehouse body 1, one end of the air inlet pipe 6 is arranged outside the warehouse body 1, and the other end of the air inlet pipe 6 is inserted into the lower chamber 4 and connected to the middle part of the bottom surface of the partition 2;

[0037] A connecting hole 7 is provided in the middle of the partition 2, and the two ends of the connecting hole 7 respectively connect the upper chamber 3 and the air inlet pipe 6, and a filter assembly 8 is installed on the partition 2 above the connecting hole 7;

[0038] A plurality of through holes 9 are provided on the partition plate 2 between the connection hole 7 and the inner surface of the chamber, and the through holes 9 connect the upper chamber 3 with the lower chamber 4 .

[0039] In this embodiment, in actual use, the air outlet is directly connected to the air inlet of the vacuum pump, and the end of the air inlet pipe outside the warehouse body is connected to the equipment or pipeline that needs to be vacuumed. During the operation, the vacuum pump generates negative pressure suction, and the negative pressure directly reaches the lower chamber. Due to the existence of the through hole, the through hole is connected to the upper chamber, so that the negative pressure will be transmitted to the upper chamber. If there is no other connection point in the upper chamber, a vacuum will be generated in the upper and lower chambers. Among them, due to the existence of the connection hole, the connection hole connects the upper chamber with the air inlet pipe, and the filter assembly is installed above the connection hole. Therefore, the negative pressure will be transmitted to the position where air needs to be pumped through the filter assembly and the air inlet pipe, so that the gas enters along the air inlet pipe, and then passes through the connection hole, and after the gas is filtered by the filter assembly, it enters the upper chamber, and then enters the lower chamber through the through hole, and then is sent to the vacuum pump through the lower chamber. When the gas passes through the filter assembly, most of the impurities such as particles will be filtered out by the filter assembly, so that the gas entering the vacuum pump is basically free of impurities such as particles, which can effectively ensure the stability of the vacuum pump, reduce the maintenance rate, and extend the service life. At the same time, since the gas needs to turn and then flow downward after passing through the filter assembly, the particles will be further affected by gravity and will be blocked by the partition and filter assembly, preventing the residual particles and other debris from entering the lower chamber as much as possible.

[0040] Furthermore, a back-blowing port (not shown in the figure) is provided on the top of the warehouse body, and the back-blowing port is arranged directly above the filter assembly. A seal or switch for opening and closing the back-blowing port is also provided on the top of the warehouse body.

[0041] In this embodiment, a switch is directly set on the back-blowing port, and a blow pipe is installed on the switch. When the switch is turned on, the blow pipe directly blows air toward the filter assembly (preferably high-pressure airflow, or in special cases, directly connected to high-pressure water), directly blows away some debris filtered by the filter assembly, or washes it off from the filter assembly and makes it flow back into the air inlet pipe. A material receiving port or a collection port can be set at the bottom of the air inlet pipe outside the warehouse body to collect and clean up the debris or sewage. In this way, there is no need for manual disassembly and cleaning, which is convenient and quick, and it will not be blown into the vacuum pump.

[0042] See also Figure 2 , 4 As shown in FIG. 5 , the filter assembly 8 includes a cylinder 10 and at least one filter screen 11. The cylinder 10 is provided with a cavity 12 with two ends passing through it. The filter screen 11 is installed in the cavity 12. The filter screen 11 is provided with a plurality of filter holes 13.

[0043] The bottom of the cylinder 10 is connected to the top surface of the partition 2 , and the cavity 12 and the filter 11 are arranged directly above the connecting hole 7 .

[0044] In this embodiment, the filter screen is a metal filter screen, and the filtration of impurities such as particulate matter is adjusted by selecting filter holes of corresponding apertures, so as to adapt to different occasions and different vacuum pumps to filter dust and other particulate matter, and to minimize the influence on the vacuum pump. At the same time, the influence of dust and other particulate matter on the vacuum pump is also prevented as much as possible, so as to ensure the service life and stability of the vacuum pump. In the utility model, the cylinder is directly above the outside of the connection hole, and it covers the connection hole, so that the gas sent out by the air inlet pipe must pass through the cavity of the cylinder after passing through the connection hole before it can enter the upper chamber, that is, it must be filtered by the metal filter screen before it can enter the upper chamber, the through hole, and the lower chamber before entering the gas outlet.

[0045] See also Figure 2 , 4 As shown in , 5, the filter screen 11 is at least two pieces, the diameter of the filter hole 13 of the lower filter screen 11 is larger than the diameter of the filter hole 13 of the adjacent upper filter screen 11, and the number of the filter holes 13 on the lower filter screen 11 is less than the number of the filter holes 13 on the adjacent upper filter screen 11. The filter screen and the cylinder are coaxially arranged. In this embodiment, taking the example of four groups of filters, the diameter of the filter holes on each group of filters is different, the filter hole diameter on the bottom filter is larger than the filter hole diameter of the adjacent upper filter, and the filter hole diameters of the filters from bottom to top gradually decrease from bottom to top. In this way, in the process of gas flowing from bottom to top, the filter with the largest filter hole will filter out particles with diameters larger than the filter hole, and some particles with smaller diameters will pass through the filter holes of the filter upward, and then be filtered by the filter with smaller filter holes above, until after passing through the top filter, most of the dust and other particles are filtered out and enter the vacuum pump. In this way, filtering is performed step by step, thereby improving the filtration efficiency and minimizing the impact on the gas flow rate.

[0046] After the vacuum pump has been working for a period of time, it is found that the speed of vacuuming has slowed down significantly, indicating that the filter is seriously blocked. In this case, the machine can be temporarily shut down, and then the back-blowing port can be operated. High-pressure gas or water can be blown in through the back-blowing port to flush the filter. In this process, since the diameter of the filter holes of the lower filter is larger than that of the upper filter, the dust and other particles on the upper layer can fall downward from the filter holes of the lower filter, so that the dust and other particles fall from the filter into the intake pipe, and then blow out from the intake pipe (or blow to the receiving port or the collecting port to be collected), and will not be blown into the vacuum pump. Of course, the vacuum pump can also be shut down regularly to back-blown to clean the filter to ensure the vacuum pump's vacuuming efficiency and quality.

[0047] See also Figure 2 , 5 As shown, an inwardly extending extension ring 14 is provided on the inner surface of the bottom of the cylinder 10 , the bottom of the extension ring 14 abuts against the top surface of the partition 2 , and the extension ring 14 is connected to the partition 2 via connecting bolts 15 .

[0048] In this embodiment, the bottom of the extension ring is flush with the bottom surface of the cylinder, and the extension ring is directly connected and fixed to the partition plate by bolts, so as to facilitate the installation, disassembly, maintenance and replacement of the filter assembly and the partition plate.

[0049] See also Figure 2 , 4 As shown in FIG. 5 , the cylinder body 10 includes at least two sleeves 16, a plurality of limiting screw holes are arranged on the top surface of the bottom sleeve 16, and a plurality of through holes are arranged on the other sleeves 16, and each through hole is arranged opposite to one of the limiting screw holes;

[0050] The outer edge of each filter 11 is arranged between adjacent sleeves 16, and a limiting bolt 17 is inserted in each through hole. The bottom of the limiting bolt 17 passes through the outer edge of the corresponding filter 11 and is screwed to one of the limiting screw holes, and the bottom of the bottommost sleeve is connected to the top of the partition.

[0051] In this embodiment, the number of sleeves is one more than the number of filter screens. In this embodiment, four filter screens are provided. Therefore, five sleeves are provided. The edge of each filter screen is respectively located between two adjacent sleeves. The bottom surface of the edge of the filter screen is against the top surface of the sleeve below, and the top surface of the edge of the filter screen is against the bottom surface of the sleeve above. The limiting bolt is inserted downward from the through hole of the top sleeve, and passes through the corresponding filter screen, the through hole of the sleeve in turn, and is connected with the limiting screw hole of the bottom sleeve, so that the assembly of the filter assembly can be realized. Among them, since the top of the sleeve does not need to be installed with a filter screen, the height of the top sleeve can be relatively high. Further, sleeves of different heights can be selected according to different situations to adjust the overall height of the cylinder, and the distance between adjacent filter screens can also be adjusted to give the gas a space to pass through the filter screen, and give each filter screen a sufficient filtering space, so as to ensure the filtering quality.

[0052] Furthermore, in this embodiment, an extension ring is arranged on the bottom inner surface of the bottom sleeve, the bottom sleeve is connected to the partition through the extension ring, and the other sleeves and filter screens are connected to the bottom sleeve through limiting bolts, thereby realizing the connection and installation of the filter assembly and the partition.

[0053] The outer edge of each filter is installed on a steel ring (not shown in the steel ring figure), the steel ring is arranged between adjacent sleeves, and a plurality of mounting holes are arranged on the steel ring, each mounting hole is arranged opposite to one of the through holes, and the bottom of the limiting bolt passes through the through hole and the mounting hole and is screwed to one of the limiting screw holes.

[0054] In this embodiment, the steel ring is used for installing and fixing the filter. When the limit bolts and the sleeve limit the filter, the steel ring is used to fix the filter and the limit bolts and the sleeve. The steel ring can increase the strength of the filter and also increase the connection strength between the filter and the cylinder, thereby ensuring the deformation resistance of the filter during the vacuum process.

[0055] The middle outer surface of the air inlet pipe is sealed to the chamber body, the inner end of the air inlet pipe is arranged in the lower chamber, and the top outer surface of the air inlet pipe is sealed to the inner wall of the connection hole;

[0056] The outer end of the air inlet pipe is arranged outside the chamber body, and a trumpet-shaped connecting pipe 18 is installed at the outer end of the air inlet pipe 6 .

[0057] In this embodiment, a hole is provided on the side wall of the silo body to connect the lower chamber with the outer wall of the silo body, the middle part of the air inlet pipe is directly welded and fixed to the hole, and the top outer surface of the air inlet pipe is welded and fixed to the connecting hole. In this embodiment, the air inlet pipe includes a transverse pipe and an arc-shaped bend pipe, the inner end of the transverse pipe is connected to the bottom of the arc-shaped bend pipe, the top of the arc-shaped bend pipe is connected to the connecting hole, and the outer end of the transverse pipe is outside the silo body. Taking the direction shown in the figure as an example, the arc-shaped bend pipe is tilted from left to right and bends upward in an arc. In this way, during backblowing, dust and other particulate matter can flow downward along the arc-shaped bend pipe into the transverse pipe, and then be blown out of the air inlet pipe or blown into the collection port or the receiving port. The trumpet-shaped connecting pipe is installed at the left end of the transverse pipe, and a flange is provided at the outer end of the trumpet-shaped connecting pipe for connecting with corresponding equipment or pipelines.

[0058] See also Figures 1 to 3 As shown, the warehouse body 1 includes a lower warehouse body 19 and an upper warehouse body 20, and the bottom outer edge of the upper warehouse body 19 is detachably connected to the top outer edge of the lower warehouse body 20;

[0059] The partition is arranged on the top of the lower warehouse body, the upper chamber is arranged in the upper warehouse body, and the lower chamber is arranged in the lower warehouse body. The filter assembly is arranged in the upper chamber, and the middle part of the air inlet pipe is connected to the middle part of the lower warehouse body.

[0060] In this embodiment, an upper bin body and a lower bin body of a split structure are adopted, and the flanges at the bottom outer edge of the upper bin body and the top outer edge of the lower bin body are connected by bolts. In this way, when the filter assembly needs to be installed, disassembled and repaired, the upper bin body can be directly removed from the lower bin body to facilitate the installation, disassembly, repair and replacement of the filter assembly.

[0061] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0062] In the present utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral one; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, for example, the two can form a mechanical abutment or abutment connection through abutment, contact, etc., the two can also be directly hung or hung through an intermediate medium, etc., or it can be the internal connection of the two elements or the interaction relationship between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A filter, characterized in that: It comprises a warehouse body with a chamber inside, a partition is provided in the middle of the chamber, the partition divides the chamber into an upper chamber and a lower chamber, and an air outlet is provided at the bottom of the warehouse body and communicated with the bottom of the lower chamber; An air inlet pipe is installed on the warehouse body, one end of the air inlet pipe is arranged outside the warehouse body, and the other end of the air inlet pipe is inserted into the lower chamber and connected to the middle part of the bottom surface of the partition; A connecting hole is provided in the middle of the partition, and the two ends of the connecting hole respectively connect the upper chamber and the air intake pipe, and a filter assembly is installed on the partition above the connecting hole; A plurality of through holes are provided on the partition between the connection hole and the inner surface of the chamber, and the through holes connect the upper chamber with the lower chamber.

2. The filter according to claim 1, characterized in that: The filter assembly includes a cylinder and at least one filter screen, the cylinder is provided with a cavity with two ends passing through, the filter screen is installed in the cavity, and the filter screen is provided with a plurality of filter holes; The bottom of the cylinder is connected to the top surface of the partition, and the cavity and the filter are arranged directly above the connection hole.

3. The filter according to claim 2, characterized in that: There are at least two filter screens, the filter hole diameter of the lower filter screen is larger than the filter hole diameter of the adjacent upper filter screen, and the number of filter holes on the lower filter screen is less than the number of filter holes on the adjacent upper filter screen.

4. The filter according to claim 2, characterized in that: An extension ring extending inward is arranged on the inner surface of the bottom of the cylinder, the bottom of the extension ring abuts against the top surface of the partition, and the extension ring is connected to the partition via connecting bolts.

5. The filter according to claim 2, characterized in that: The cylinder body comprises at least two sleeves, a plurality of limiting screw holes are arranged on the top surface of the bottom sleeve, and a plurality of through holes are arranged on the other sleeves, and each through hole is arranged opposite to one of the limiting screw holes; The outer edge of each filter is arranged between adjacent sleeves, and a limiting bolt is inserted into each through hole, the bottom of the limiting bolt passes through the outer edge of the corresponding filter and is screwed to one of the limiting screw holes, and the bottom of the bottommost sleeve is connected to the top of the partition; And / or, an extension ring extending inward is provided on the bottom inner surface of the bottom sleeve, the bottom of the extension ring abuts against the top surface of the partition, and the extension ring is connected to the partition via connecting bolts.

6. The filter according to claim 5, characterized in that: The outer edge of each filter is installed on a steel ring, which is arranged between adjacent sleeves and has multiple mounting holes arranged around it. Each mounting hole is arranged opposite to a through hole, and the bottom of the limiting bolt passes through the through hole and the mounting hole and is screwed to a limiting screw hole.

7. The filter according to claim 1, characterized in that: The middle outer surface of the air inlet pipe is sealed to the chamber body, the inner end of the air inlet pipe is arranged in the lower chamber, and the top outer surface of the air inlet pipe is sealed to the inner wall of the connection hole; The outer end of the air inlet pipe is arranged outside the warehouse body, and a trumpet-shaped connecting pipe is installed on the outer end of the air inlet pipe.

8. The filter according to claim 1, characterized in that: The warehouse body comprises a lower warehouse body and an upper warehouse body, and the bottom outer edge of the upper warehouse body is detachably connected to the top outer edge of the lower warehouse body; The partition is arranged on the top of the lower warehouse body, the upper chamber is arranged in the upper warehouse body, and the lower chamber is arranged in the lower warehouse body.

9. The filter according to claim 8, characterized in that: The filter assembly is arranged in the upper chamber, and the middle part of the air inlet pipe is connected to the middle part of the lower warehouse body.

10. The filter according to claim 1, characterized in that: The top of the warehouse body is also provided with a back-blowing port, and the back-blowing port is arranged directly above the filter assembly. The top of the warehouse body is also provided with a sealing member or a switch for opening and closing the back-blowing port.

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