A multi-layer filter bag type filtering device and its use method

Abstract

The present invention belongs to the technical field of filtering equipment, and in particular relates to a multi-layer filter bag type filtering device and a method of using the same, comprising: an outer shell, an air inlet and an air outlet are arranged on the outer shell, and a detachable top cover is arranged on the top of the outer shell; further comprising: a metal membrane filter layer, the metal membrane filter layer is arranged in the outer shell for preliminary filtering of dust impurities; a filter bag filtering mechanism, the filter bag filtering mechanism comprises a plurality of filter bags, the filter bag filtering mechanism is arranged below the metal membrane filter layer for further filtering of dust impurities; an electrostatic drainage mechanism, the electrostatic drainage mechanism is used to release static electricity generated by charges accumulated on the surface of the filter bag; wherein the filter bag filtering mechanism is installed in the outer shell and the filter bag is detachably connected to the outer shell. Compared with the prior art, the present invention improves the filtering effect on dust impurities, can prevent the occurrence of dust explosion caused by static electricity, and reduces safety hazards.

Description

Technical Field

[0001] The invention belongs to the technical field of filtering equipment, and in particular relates to a multi-layer filter bag type filtering device and a use method thereof. Background Art

[0002] Filtration is a process frequently used in the fields of chemical industry, petroleum, metallurgy, electric power, cement, etc., among which bag dust collector is a commonly used filtration device in the filtration process. The existing bag dust collector is generally composed of an outer shell and a filter bag arranged in the outer shell, and the outer shell is provided with a top cover, an air inlet and an air outlet. For example, the patent with application number CN201911265785.4 discloses a multi-layer filter bag filter, in which the upper and lower ends of the cylinder are respectively fixedly connected with upper and lower end covers, and the upper and lower end covers are respectively connected with a feed pipeline and a discharge pipeline; the upper and lower annular plates are respectively fixedly connected at the upper and middle parts of the cylinder; the first and second filter mechanisms have the same structure, both of which are composed of a sleeve with openings at both ends located at the upper part and a filter bag connected to the lower open end of the sleeve, wherein the upper end of the sleeve is fixedly connected to the outside with a flange; the first filter mechanism is It is arranged inside the upper annular plate and is fixedly connected to the upper annular plate through the flange therein; the second filter mechanism is arranged inside the lower annular plate and is fixedly connected to the lower annular plate through the flange therein; and the lower end of the filter bag in the first filter mechanism extends into the interior of the sleeve in the second filter mechanism, and the middle part of the sleeve in the second filter mechanism is fixedly connected with a steel filter screen. The filter has a double-layer filter bag with ideal filtering effect and can meet the production needs of high-standard slurry. However, it is found in actual use that as the dust impurities filtered by the filter bag increase, the surface of the filter bag is prone to accumulate charges and cause static electricity, which reduces the filtering effect and is also prone to safety hazards. At the same time, the connection gap through the flange is prone to leak dust impurities with smaller particles, resulting in reduced filtering effect, so it is necessary to make improvements. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-layer filter bag type filtering device and a method of using the same in order to solve the above-mentioned technical problems, thereby achieving the effect of improving the filtering effect and reducing safety hazards.

[0004] In view of this, the present invention provides a multi-layer filter bag type filtering device, comprising:

[0005] A housing, wherein an air inlet and an air outlet are arranged on the housing, and a removable top cover is arranged on the top of the housing;

[0006] Also includes:

[0007] A metal membrane filter layer, the metal membrane filter layer is arranged in the housing for preliminary filtering of dust impurities;

[0008] A filter bag filtering mechanism, the filter bag filtering mechanism comprising a plurality of filter bags, the filter bag filtering mechanism being arranged below the metal membrane filter layer for further filtering dust impurities;

[0009] An electrostatic discharge mechanism, which is used to discharge static electricity generated by charges accumulated on the surface of the filter bag;

[0010] Wherein, the filter bag filtering mechanism is installed in the shell and the filter bag is detachably connected to the shell.

[0011] In the present technical solution, the metal membrane filter layer cooperates with the filter bag filter mechanism to perform double filtration on the dust impurities, thereby improving the filtration effect on the dust impurities. The electrostatic conduction mechanism can effectively release the static electricity generated by the charges accumulated on the surface of the filter bag, preventing the occurrence of dust explosions caused by static electricity and reducing safety hazards.

[0012] In the above technical solution, further, the metal membrane filter layer also includes:

[0013] A first filter layer, the first filter layer is composed of a plurality of first metal filter membranes;

[0014] A second filter layer, wherein the second filter layer is composed of a plurality of second metal filter membranes;

[0015] Wherein, the first filter layer is located above the second filter layer, and the filtering efficiency of the first filter layer is lower than that of the second filter layer.

[0016] The first metal filter membrane and the second metal filter membrane both include a filter membrane body and a plurality of filter holes formed on the filter membrane body.

[0017] In the present technical solution, the metal membrane filter layer performs preliminary filtration on dust impurities, and while ensuring the effect of preliminary filtration, it has the characteristics of long service life and high high temperature resistance, and can be repeatedly cleaned and recycled, making it convenient for users to maintain and clean it.

[0018] In the above technical solution, further, the static electricity drainage mechanism also includes:

[0019] A metal mesh, wherein the metal mesh is sandwiched in the filter bag;

[0020] A conductive block, which is arranged at the bottom end of the metal mesh and connected to the housing;

[0021] Wherein, the metal mesh is connected to the conductive block.

[0022] The static electricity drainage mechanism also includes:

[0023] The conductive member is disposed in the housing and connected to the housing, and the conductive member can contact the conductive block to conduct static electricity to the housing.

[0024] In this technical solution, the static electricity generated by the charges accumulated on the surface of the filter bag is transmitted to the metal mesh and moves to the conductive block through the metal mesh. When the conductive block contacts the conductive member, the static electricity moves to the outer shell through the conductive member, and finally moves from the outer shell placed on the ground to the ground, thereby releasing the static electricity.

[0025] In the above technical solution, further, the filter bag filtering mechanism also includes:

[0026] A fixing ring, on which the filter bag is fixedly mounted;

[0027] A ring frame, wherein the ring frame is arranged in the outer shell, and a mounting platform is arranged on the inner side of the ring frame;

[0028] A sealing fastener, which is disposed between the fixing ring and the ring frame and is used to fasten the fixing ring and seal the contact surface between the fixing ring and the ring frame;

[0029] Wherein, the fixing ring is erected on a erection platform.

[0030] The sealing fastener also includes:

[0031] A sealing and fastening airbag, wherein the sealing and fastening airbag is provided with an inflation tube;

[0032] An annular arc surface groove, wherein the annular arc surface groove is arranged on the outer side wall of the fixing ring and the inner side wall of the ring frame;

[0033] The sealing and fastening airbag and the annular arc surface groove can cooperate with each other and the sealing and fastening airbag is fixedly installed on the ring frame, and the inflation end of the inflation tube is located outside the shell.

[0034] In the present technical solution, after the fixing ring is placed on the mounting platform, air is inflated into the sealing and fastening airbag through the inflation tube. After the sealing and fastening airbag swells, it abuts against the annular arc groove. The sealing and fastening airbag seals the gap between the fixing ring and the ring frame under the action of pressure. When removing the filter bag, it is only necessary to discharge the high-pressure gas in the sealing and fastening airbag through the inflation tube to loosen the fit between the sealing and fastening airbag and the annular arc groove, so that the fixing ring can be picked up from the mounting platform, and then the filter bag can be maintained and cleaned.

[0035] In the above technical solution, further, the sealing and fastening airbag also includes:

[0036] A wear-resistant layer, wherein the wear-resistant layer is an elastic wear-resistant film;

[0037] An airtight layer, wherein the airtight layer is a polyurethane film;

[0038] A pressure-bearing layer, wherein the pressure-bearing layer is an elastic fiber woven material;

[0039] A heat-insulating layer, wherein the heat-insulating layer is a heat-insulating material;

[0040] Airbag body;

[0041] The wear-resistant layer, airtight layer, pressure-bearing layer and heat-insulating layer are arranged in sequence from outside to inside on the outside of the airbag body.

[0042] In the present technical solution, the wear-resistant layer can improve the wear resistance of the sealing and fastening airbag, reduce the wear and damage of the sealing and fastening airbag, and increase the service life of the sealing and fastening airbag. The airtight layer can improve the sealing of the sealing and fastening airbag and prevent the sealing and fastening airbag from leaking. The pressure-bearing layer can ensure that the sealing and fastening airbag can provide effective pressure to achieve the fastening and sealing of the fixing ring. The heat-insulating layer can improve the heat resistance of the sealing and fastening airbag, so that when filtering high-temperature gas, the sealing and fastening airbag will not be damaged due to high temperature.

[0043] In the above technical solution, further, the present invention discloses a method for using the above multi-layer bag filter device, comprising the following steps:

[0044] S1. Preparation before filtration: open the top cover on the housing, install the metal membrane filter layer in the housing, and set up the fixing ring with the filter bag on the ring frame in sequence, inflate the sealing and fastening airbag through the inflation tube, and after the sealing and fastening airbag is inflated, it will closely abut against the annular arc groove to form a seal and fix the fixing ring on the erection platform, and finally close the top cover;

[0045] S2, Filtration: The airflow with dust and impurities enters the shell from the air inlet, and passes through the metal membrane filter layer and the filter bag in turn, and finally the clean airflow is discharged from the air outlet;

[0046] S3, static electricity release: During the filtration process, the static electricity generated by the charges accumulated on the surface of the filter bag is transferred to the metal mesh, and then moves to the conductive block through the metal mesh. When the conductive block contacts the conductive member, the static electricity moves to the outer shell through the conductive member, and finally moves from the outer shell placed on the ground to the ground, thereby releasing the static electricity;

[0047] S4. Maintenance: By discharging the high-pressure gas in the sealing and fastening airbag through the inflation tube, the fit between the sealing and fastening airbag and the annular arc groove becomes loose, and the fixing ring can be lifted from the mounting platform to perform maintenance and cleaning on the filter bag.

[0048] In the present technical scheme, the above-mentioned invention is adopted to operate the multi-layer bag filter device, thereby improving the filtering effect of the multi-layer bag filter device on dust impurities, and the installation and disassembly are simple, which facilitates the user to maintain the multi-layer bag filter device and improves the service life of the multi-layer bag filter device.

[0049] The beneficial effects of the present invention are:

[0050] 1. The metal membrane filter layer and the filter bag filter mechanism cooperate to double filter the dust impurities, thus improving the filtering effect of dust impurities;

[0051] 2. The static electricity generated by the charges accumulated on the surface of the filter bag can be effectively released through the static electricity drainage mechanism, preventing the occurrence of dust explosion caused by static electricity and reducing safety hazards;

[0052] 3. The fixing ring with the filter bag is fixed by sealing and tightening the airbag, which facilitates the installation and removal of the filter bag, making it convenient for users to maintain and clean the filter bag;

[0053] 4. The service life of the sealing and fastening airbag and the stability of the sealing effect are improved by setting the wear-resistant layer, airtight layer, pressure-bearing layer and heat-insulating layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0055] Figure 1 It is a schematic structural diagram of a specific implementation method of the present invention.

[0056] Figure 2 It is a schematic diagram of the top view structure of the present invention.

[0057] Figure 3 It is a schematic diagram of the cross-sectional structure of the shell of the present invention.

[0058] Figure 4 This is a schematic diagram of the structure of the first filter layer of the present invention.

[0059] Figure 5 It is a schematic diagram of the sealing and fastening airbag structure of the present invention.

[0060] Figure 6 It is a schematic diagram of the cross-sectional structure of the filter bag of the present invention.

[0061] The symbols in the figure are:

[0062] 1-housing, 100-air inlet, 101-air outlet, 102-top cover, 2-metal membrane filter layer, 20-first filter layer, 21-second filter layer, 200-filter membrane body, 201-filter hole, 3-filter bag filter mechanism, 30-filter bag, 31-fixing ring, 32-ring frame, 320-erection platform, 4-static discharge mechanism, 40-metal mesh, 41-conductive block, 42-conductive member, 5-sealing fastener, 50-annular arc groove, 6-sealing fastening airbag, 60-wear-resistant layer, 61-airtight layer, 62-pressure-bearing layer, 63-insulating layer, 64-airbag body, 7-inflating tube. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0065] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0066] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0067] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0068] Embodiment 1:

[0069] The embodiment of the present application provides a multi-layer filter bag type filter device, comprising: a housing 1, an air inlet 100 and an air outlet 101 are provided on the housing 1, and a detachable top cover 102 is provided on the top of the housing 1;

[0070] It also includes: a metal membrane filter layer 2, which is arranged in the housing 1 for preliminary filtering of dust impurities; a filter bag filtering mechanism 3, which includes a plurality of filter bags 30, and the filter bag filtering mechanism 3 is arranged below the metal membrane filter layer 2 for further filtering of dust impurities; an electrostatic drainage mechanism 4, which is used to release static electricity generated by charges accumulated on the surface of the filter bag 30;

[0071] The filter bag filtering mechanism 3 is installed in the housing 1 and the filter bag 30 is detachably connected to the housing 1 .

[0072] Moreover, the top cover is sealedly connected to the outer shell 1, and the top cover is connected to the top of the outer shell 1 by a conventional detachable connection method, such as a threaded connection. The air inlet is located at the upper part of the side wall of the outer shell 1, and the air outlet is located at the lower end of the outer shell 1. A circle of annular protrusions is fixedly installed on the inner wall of the outer shell 1, and the annular protrusions are coaxial with the outer shell 1. The metal membrane filter layer 2 is mounted on the annular protrusions and thus installed in the outer shell 1. The metal membrane filter layer 2 is in a horizontal state after installation.

[0073] In this embodiment, the metal membrane filter layer 2 cooperates with the filter bag filter mechanism 3 to perform double filtration on the dust impurities, thereby improving the filtering effect on the dust impurities, and the electrostatic conduction mechanism 4 can effectively release the static electricity generated by the charges accumulated on the surface of the filter bag, preventing the occurrence of dust explosion caused by static electricity and reducing safety hazards.

[0074] Embodiment 2:

[0075] This embodiment provides a multi-layer filter bag type filter device, which, in addition to the technical solutions of the above embodiments, also has the following technical features, the metal membrane filter layer 2 also includes: a first filter layer 20, the first filter layer 20 is composed of a plurality of first metal filter membranes; a second filter layer 21, the second filter layer 21 is composed of a plurality of second metal filter membranes;

[0076] The first filter layer 20 is located above the second filter layer, and the filtering efficiency of the first filter layer 20 is lower than that of the second filter layer 21 .

[0077] The first metal filter membrane and the second metal filter membrane each include a filter membrane body 200 and a plurality of filter holes 201 formed on the filter membrane body 200 .

[0078] Moreover, the plurality of first metal filter membranes and the plurality of second metal filter membranes are arranged from top to bottom, and the diameters of the filter holes decrease from top to bottom.

[0079] In this embodiment, the metal membrane filter layer 2 performs preliminary filtration on dust impurities. While ensuring the effect of preliminary filtration, it has the characteristics of long service life and high high temperature resistance. It can be repeatedly cleaned and recycled, which is convenient for users to maintain and clean it.

[0080] Embodiment 3:

[0081] This embodiment provides a multi-layer filter bag type filter device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the static electricity drainage mechanism 4 also includes: a metal mesh 40, the metal mesh 40 is sandwiched in the filter bag 30; a conductive block 41, the conductive block 41 is arranged at the bottom end of the metal mesh 40 and connected to the housing 1;

[0082] The metal mesh 40 is connected to the conductive block 41. The static electricity dissipation mechanism 4 further includes a conductive member 42, which is disposed in the housing 1 and connected to the housing 1. The conductive member 42 can contact the conductive block 41 to dissipate static electricity to the housing 1.

[0083] Moreover, the mesh diameter of the metal mesh 40 is within a range that does not affect the filtering of dust impurities, the conductive block 41 is a conductive metal block, and the conductive member 42 can be a mesh metal plate or other conductive metal structure that does not affect the passage of dust impurities. When the outer casing 1 is not in contact with the ground, a conventional grounding mechanism can be added to discharge static electricity.

[0084] In this embodiment, the static electricity generated by the charges accumulated on the surface of the filter bag is transferred to the metal mesh 40 and moves to the conductive block 41 through the metal mesh 40. When the conductive block 41 contacts the conductive member 42, the static electricity moves to the outer shell 1 through the conductive member 42, and finally moves from the outer shell 1 placed on the ground to the ground, thereby releasing the static electricity.

[0085] Embodiment 4:

[0086] This embodiment provides a multi-layer filter bag type filtering device, which, in addition to the technical solutions of the above embodiments, also has the following technical features. The filter bag filtering mechanism 3 also includes: a fixing ring 31, on which the filter bag 30 is fixedly mounted; a ring frame 32, which is arranged in the housing 1, and a mounting platform 320 is arranged on the inner side of the ring frame 32; a sealing fastener 5, which is arranged between the fixing ring 31 and the ring frame 32 to fasten the fixing ring 31 and seal the contact surface between the fixing ring 31 and the ring frame 32;

[0087] The fixing ring 31 is mounted on the mounting platform 320 .

[0088] The sealing fastener 5 also includes: a sealing fastening airbag 6, on which a closable inflation tube 7 is provided; an annular arc surface groove 50, which is provided on the outer side wall of the fixing ring 31 and the inner side wall of the ring frame 32;

[0089] The sealing and fastening airbag 6 and the annular arc groove 50 can cooperate with each other and the sealing and fastening airbag 6 is fixedly installed on the ring frame 32 , and the inflation end of the closable inflation tube 7 is located outside the shell 1 .

[0090] Moreover, the filter bag is installed on the lower side of the fixed ring 31, the ring frame 32 is coaxial with the outer shell 1, the outer side of the ring frame 32 is fixedly connected to the inside of the outer shell 1, the mounting platform 320 is an annular platform, and a plurality of fixed rings 31 and ring frames 32 are provided corresponding to the number of filter bags. The plurality of fixed rings 31 and ring frames 32 are arranged in sequence from top to bottom in the outer shell 1, the diameter of the fixed ring 31 decreases from top to bottom, and the inner diameter of the ring frame 32 changes as the diameter of the fixed ring 31 decreases.

[0091] In this embodiment, after the fixing ring 31 is placed on the mounting platform 320, air is inflated into the sealing and fastening airbag 6 through the inflation tube. After the sealing and fastening airbag 6 swells, it abuts against the annular arc groove 50. The sealing and fastening airbag 6 seals the gap between the fixing ring 31 and the ring frame 32 under the action of pressure. When removing the filter bag, it is only necessary to discharge the high-pressure gas in the sealing and fastening airbag 6 through the inflation tube to loosen the fit between the sealing and fastening airbag 6 and the annular arc groove 50, so that the fixing ring 31 can be picked up from the mounting platform 320, and then the filter bag can be maintained and cleaned.

[0092] Embodiment 5:

[0093] This embodiment provides a multi-layer filter bag type filter device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the sealing and fastening airbag 6 also includes: a wear-resistant layer 60, which is an elastic wear-resistant film; an airtight layer 61, which is a polyurethane film; a pressure-bearing layer 62, which is an elastic fiber woven material; a heat-insulating layer 63, which is a heat-insulating material; and an airbag body 64;

[0094] The wear-resistant layer 60 , the airtight layer 61 , the pressure-bearing layer 62 and the heat-insulating layer 63 are sequentially arranged from the outside to the inside on the outside of the airbag body 64 .

[0095] In this embodiment, the wear-resistant layer 60 can improve the wear resistance of the sealing and fastening airbag 6, reduce the wear and damage of the sealing and fastening airbag 6, and improve the service life of the sealing and fastening airbag 6. The airtight layer 61 can improve the sealing of the sealing and fastening airbag 6 and prevent the sealing and fastening airbag 6 from leaking. The pressure-bearing layer 62 can ensure that the sealing and fastening airbag 6 can provide effective pressure to achieve the fastening and sealing of the fixing ring 31. The heat-insulating layer 63 can improve the heat resistance of the sealing and fastening airbag 6, so that when filtering high-temperature gas, the sealing and fastening airbag 6 will not be damaged due to high temperature.

[0096] Embodiment 6:

[0097] This embodiment provides a method for using the multi-layer bag filter device, which, in addition to the technical solution of the above embodiment, also has the following technical features, including the following steps:

[0098] S1. Preparation before filtration: open the top cover 102 on the housing 1, and install the fixing ring 31 with the filter bag 30 on the ring frame 32 in sequence, inflate the sealing and fastening airbag 6 through the inflation tube 7, and after the sealing and fastening airbag 6 is inflated, it abuts tightly against the annular arc groove 50 to form a seal and fix the fixing ring 31 on the installation platform 320, install the metal membrane filter layer 2 in the housing 1, and finally close the top cover 102;

[0099] S2, filtration: The airflow with dust and impurities enters the housing 1 from the air inlet 100, and is filtered by the metal membrane filter layer 2 and the filter bag 30 in turn, and finally the clean airflow is discharged from the air outlet 101;

[0100] S3, static electricity release: During the filtering process, static electricity generated by the charges accumulated on the surface of the filter bag 30 is transferred to the metal mesh 40, and moves to the conductive block 41 through the metal mesh 40. The conductive block 41 contacts the conductive member 42, and the static electricity moves to the housing 1 through the conductive member 42, and finally moves from the housing 1 placed on the ground to the ground, thereby releasing the static electricity;

[0101] S4, maintenance: by discharging the high-pressure gas in the sealing and fastening airbag 6 through the inflation tube 7, the fit between the sealing and fastening airbag 6 and the annular arc groove 50 becomes loose, and the fixing ring 31 can be lifted from the mounting platform 320, and then the filter bag 30 can be maintained and cleaned.

[0102] In this embodiment, the above invention is used to operate the multi-layer bag filter device, which improves the filtering effect of the multi-layer bag filter device on dust impurities, and is simple to install and disassemble, which facilitates the user to maintain the multi-layer bag filter device and increases the service life of the multi-layer bag filter device.

[0103] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A multi-layer filter bag type filter device, characterized in that: include: A housing, wherein an air inlet and an air outlet are arranged on the housing, and a removable top cover is arranged on the top of the housing; Also includes: A metal membrane filter layer, the metal membrane filter layer is arranged in the housing for preliminary filtering of dust impurities; A filter bag filtering mechanism, the filter bag filtering mechanism comprising a plurality of filter bags, the filter bag filtering mechanism being arranged below the metal membrane filter layer for further filtering dust impurities; An electrostatic discharge mechanism, which is used to discharge static electricity generated by charges accumulated on the surface of the filter bag; Wherein, the filter bag filtering mechanism is installed in the housing and the filter bag is detachably connected to the housing; The metal membrane filter layer also includes: A first filter layer, the first filter layer is composed of a plurality of first metal filter membranes; A second filter layer, wherein the second filter layer is composed of a plurality of second metal filter membranes; Wherein, the first filter layer is located above the second filter layer, and the filtering efficiency of the first filter layer is lower than that of the second filter layer; The static electricity drainage mechanism also includes: A metal mesh, wherein the metal mesh is sandwiched in the filter bag; A conductive block, which is arranged at the bottom end of the metal mesh and connected to the housing; Wherein, the metal mesh is connected to the conductive block; The static electricity drainage mechanism also includes: A conductive member, the conductive member is disposed in the housing and connected to the housing, and the conductive member can contact the conductive block to conduct static electricity to the housing; The filter bag filtering mechanism also includes: A fixing ring, on which the filter bag is fixedly mounted; A ring frame, wherein the ring frame is arranged in the outer shell, and a mounting platform is arranged on the inner side of the ring frame; A sealing fastener, which is disposed between the fixing ring and the ring frame and is used to fasten the fixing ring and seal the contact surface between the fixing ring and the ring frame; Wherein, the fixing ring is mounted on a mounting platform; The sealing fastener also includes: A sealing and fastening airbag, wherein the sealing and fastening airbag is provided with a closable inflation tube; An annular arc surface groove, wherein the annular arc surface groove is arranged on the outer side wall of the fixing ring and the inner side wall of the ring frame; The sealing and fastening airbag and the annular arc groove can cooperate with each other and the sealing and fastening airbag is fixedly mounted on the ring frame, and the inflation end of the closable inflation tube is located outside the shell; The sealing and fastening airbag also includes: A wear-resistant layer, wherein the wear-resistant layer is an elastic wear-resistant film; An airtight layer, wherein the airtight layer is a polyurethane film; A pressure-bearing layer, wherein the pressure-bearing layer is an elastic fiber woven material; A heat-insulating layer, wherein the heat-insulating layer is a heat-insulating material; Airbag body; The wear-resistant layer, airtight layer, pressure-bearing layer and heat-insulating layer are arranged in sequence from outside to inside on the outside of the airbag body.

2. A multi-layer filter bag type filter device according to claim 1, characterized in that: The first metal filter membrane and the second metal filter membrane both include a filter membrane body and a plurality of filter holes formed on the filter membrane body.

3. A method for using the multi-layer bag filter device according to claim 2, characterized in that: The following steps are involved: S1. Preparation before filtration: open the top cover on the housing, and install the fixing ring with the filter bag on the ring frame in sequence, inflate the sealing and fastening airbag through the inflation tube, and after the sealing and fastening airbag is inflated, it will tightly abut against the annular arc groove to form a seal and fix the fixing ring on the installation platform, install the metal membrane filter layer in the housing, and finally close the top cover; S2, Filtration: The airflow with dust and impurities enters the shell from the air inlet, and passes through the metal membrane filter layer and the filter bag in turn, and finally the clean airflow is discharged from the air outlet; S3, static electricity release: During the filtration process, the static electricity generated by the charges accumulated on the surface of the filter bag is transferred to the metal mesh, and then moves to the conductive block through the metal mesh. The conductive block contacts the conductive member, and the static electricity moves to the outer shell through the conductive member, and finally moves from the outer shell placed on the ground to the ground, thereby releasing the static electricity; S4. Maintenance: By discharging the high-pressure gas in the sealing and fastening airbag through the inflation tube, the fit between the sealing and fastening airbag and the annular arc groove becomes loose, and the fixing ring can be lifted from the mounting platform to perform maintenance and cleaning on the filter bag.

Images