CN216295571U

CN216295571U - Gas filtering device

Info

Publication number: CN216295571U
Application number: CN202122012034.0U
Authority: CN
Inventors: 庞红武; 严斌; 赵汉伟
Original assignee: Shenzhen Zhongjian South Environment Co ltd
Current assignee: Shenzhen Zhongjian South Environment Co ltd
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2022-04-15
Anticipated expiration: 2031-08-24

Abstract

The utility model discloses a gas filtering device which comprises a main body, a fan and a filtering assembly, wherein the main body comprises a shell, the shell is provided with an air flue, and the shell is also provided with an air inlet and an air outlet which are communicated with the air flue; the fan is used for driving the air to flow from the air inlet hole to the air outlet hole; the filter assembly comprises a primary filter, a chemical filter and a high-efficiency filter, the primary filter, the chemical filter and the high-efficiency filter are sequentially arranged in the air passage along the air outlet direction of the air passage, the diameter of impurity particles which can be filtered by the primary filter is larger than that of the impurity particles which can be filtered by the high-efficiency filter, and the chemical filter is used for removing volatile organic gas. The primary filter performs primary filtration to reduce impurity accumulation in the filtering device; the chemical filter can efficiently remove volatile organic gases, so that the harm caused by toxic and harmful gases is reduced; the high-efficiency filter further filters the gas, removes suspended particles and macromolecular bacteria and viruses and provides clean gas.

Description

Gas filtering device

Technical Field

The utility model relates to the technical field of air filtration, in particular to a gas filtering device.

Background

In the production process of industrial products such as chemical industry, electronics and the like, a large amount of volatile organic gases are generated, and the volatile organic gases generally have certain corrosivity and irritation, not only can corrode and damage production instruments and equipment, influence the product manufacturing process, but also cause poor exposure, influence the product quality, have great harm to human bodies, and have the risks of poisoning and carcinogenesis.

Based on the above, the existing scheme is to use the chemical filter device to purify the air, but most of the floating objects such as dust exist in the industrial environment, so that the chemical filter device is easy to block or be attached to the surface of a device treatment medium, the treatment effect of the chemical filter device is influenced, the gas flow resistance is increased, and the performance of the fan is required to be higher.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a gas filtering device which can ensure the treatment effect of a chemical filter on volatile organic gases and purify the gases efficiently.

A gas filtration device according to an embodiment of the first aspect of the utility model comprises:

the main body comprises a shell, the shell is provided with an air flue, and the shell is also provided with an air inlet and an air outlet which are communicated with the air flue;

the fan is used for driving the air to flow from the air inlet hole to the air outlet hole;

the filter assembly comprises a primary filter, a chemical filter and a high-efficiency filter, wherein the primary filter and the high-efficiency filter are arranged in sequence along the air outlet direction of the air passage, the diameter of impurity particles which can be filtered by the primary filter is larger than that of the impurity particles which can be filtered by the high-efficiency filter, and the chemical filter is used for removing volatile organic gas.

The gas filtering device provided by the embodiment of the utility model has at least the following beneficial effects:

the primary filter performs primary filtration on large-particle impurities in the gas, reduces impurity accumulation in the filter device and prevents the chemical filter from being blocked; the chemical filter can efficiently remove volatile organic gases, so that the harm of toxic and harmful gases to instruments and human bodies is reduced; the high-efficiency filter further filters the gas, removes suspended particles attached to the chemical filter and macromolecular suspended matters and bacterial viruses originally existing in the gas, and provides clean and fresh gas.

According to some embodiments of the utility model, the chemical filter comprises a filter cartridge set, each filter cartridge set comprising a plurality of filter cartridges arranged in parallel, the filter cartridges being detachably secured to the housing, the filter cartridges being filled with a filter medium.

According to some embodiments of the utility model, the main body further comprises a mounting plate, the mounting plate is fixedly connected with the housing, the mounting plate is located in the air passage, the mounting plate is provided with air holes and mounting holes, and the filter cartridge comprises a clamping head which is fixedly clamped with the mounting holes.

According to some embodiments of the present invention, the clamping head comprises a connecting column and a limiting head, the limiting head is fixed at one end of the connecting column, the mounting hole has a width larger than the diameter of the connecting column, the mounting hole comprises an insertion hole and a limiting hole, the width of the insertion hole is larger than the diameter of the limiting head, the width of the limiting hole is smaller than the diameter of the limiting head, the connecting column is inserted into the mounting hole, and the connecting column can move from the insertion hole into the limiting hole.

According to some embodiments of the utility model, the primary filter is removably attached to the housing.

According to some embodiments of the utility model, the main body further comprises a slide rail, the slide rail is fixedly connected with the housing, the slide rail is located in the air passage, the primary filter can slide along the slide rail, the main body further comprises a sliding door, the housing is provided with a cleaning opening communicated with the air passage at the slide rail, and the sliding door is used for closing or opening the cleaning opening.

According to some embodiments of the utility model, the high efficiency filter is removably secured to the housing.

According to some embodiments of the utility model, the air outlet hole is provided in plurality, and the chemical filter and the high efficiency filter are arranged in the air passage corresponding to each air outlet hole.

According to some embodiments of the utility model, the air passage further comprises a static pressure chamber, the blower is located in the air passage, and the static pressure chamber is located between the blower and the chemical filter.

According to some embodiments of the utility model, the main body further comprises a grill plate provided with a plurality of the air inlet holes.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The utility model is further described with reference to the following figures and examples, in which:

FIG. 1 is a schematic perspective view of a gas filtration apparatus according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the gas filtration device of FIG. 1;

FIG. 3 is an enlarged view taken at A in FIG. 2;

FIG. 4 is a schematic structural view of the filter cartridge of FIG. 1;

FIG. 5 is a front view of the snap connector of FIG. 4;

FIG. 6 is a cross-sectional view of the snap connector of FIG. 5 taken along section D-D;

FIG. 7 is a front view of the mounting plate of FIG. 2;

FIG. 8 is an enlarged view at B of FIG. 1;

fig. 9 is a detail view of the assembly of the high efficiency filter and the body of fig. 1.

Reference numerals:

the chemical filter comprises a chemical filter 100, a filter cartridge 110, a clamping joint 120, a limiting head 121 and a connecting column 122;

a fan 200;

a primary filter 300;

a caster 400;

a hydrostatic pocket 500;

a high efficiency filter 600;

the sliding door comprises a main body 700, a mounting plate 710, a mounting hole 711, an insertion hole 7111, a limiting hole 7112, an air hole 713, a sliding door 720, a sliding door switch 721, a grid plate 730, a sliding rail 740, an upper sliding rail 741, a lower sliding rail 742 and a limiting step 750;

a fastener 800.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present numbers, and the above, below, within, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

A gas filtering apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to fig. 1, it should be noted that, for convenience of illustration, fig. 1 is a view showing a main body cover plate on the front side of the gas filter device. The gas filtering apparatus according to the embodiment of the present invention includes a main body 700, a blower 200, a primary filter 300, a chemical filter 100, and a high efficiency filter 600. The main body 700 comprises a shell, an air passage is arranged in the shell, an air inlet is formed in the outer wall of the lower end of the shell, an air outlet is formed in the efficient filter 600 at the upper end of the shell, and the primary filter 300, the chemical filter 100 and the efficient filter 600 are sequentially arranged in the air passage along the air flowing direction from the air inlet to the air outlet.

When the blower 200 is started, air is drawn in through the inlet openings, first through the primary filter 300. The primary filter 300 is mainly used for primarily filtering gas, reducing dust deposition in the shell, prolonging the service life of the chemical filter 100 and the high-efficiency filter 600 and improving the service efficiency of subsequent components. After the primary filtration of the primary filter 300, the gas is continuously lifted under the action of the fan 200 and flows to the chemical filter 100. The chemical filter 100 is filled with a filter medium, which can adsorb and remove volatile organic compounds, colloidal impurities, heavy metal ions and other toxic and harmful substances in the gas, and reduce the harm of the toxic and harmful gas to instruments and equipment and human bodies. After being filtered by the chemical filter 100, the gas continues to flow to the high efficiency filter 600, and the high efficiency filter 600 is mainly used for further filtering the gas, removing gas impurities which cannot be filtered by the primary filter 300 and newly generated suspended particles in the chemical filter 100, further filtering purified gas, and reducing gas hazard. The gas is filtered by the high efficiency filter 600 and then discharged from the high efficiency filter 600. Harmful impurity gas is purified into harmless pure gas after being filtered by the gas filtering device.

Specifically, primary filter 300 mainly used filters dust and other impurities more than 5um in the gas, prevents that the dust from piling up the gathering in casing, chemical filter 100 and high efficiency filter 600, and is corresponding, has reduced the flow resistance of gas in chemical filter 100, has reduced the performance requirement to fan 200, makes fan 200 have the bigger lectotype space. High efficiency filter 600 compares and has higher filter fineness in primary filter 300, can filter to suspended particles, organic matter below 5um, further clears away the suspended particles of newly producing in impurity in the gas and the chemical filter 100, and partial macromolecule bacterium and macromolecule virus also can be intercepted by high efficiency filter 600 simultaneously, make gas safe purer.

In a further embodiment of the present invention, the filter material of the primary filter 300 is made of polyester synthetic fiber, so that the primary filter 300 can be cleaned and reused many times, and has a long service life. The high-efficiency filter 600 adopts superfine glass fiber paper as a filter material, has higher filtering precision, high filtering speed, high repeated utilization rate and can be cleaned and reused for many times.

In some embodiments of the present invention, chemical filter 100 comprises a filter cartridge assembly comprising a plurality of filter cartridges 110 arranged in parallel, the filter cartridges being removably secured to a housing, the filter cartridges 110 being filled with a filter medium. Specifically, referring to fig. 1 and 4, two groups of filter cylinder sets in fig. 1 are symmetrically disposed in the housing of the main body 700, the filter cylinders 110 are uniformly arranged in four rows and three columns on the mounting plate 710 to form the filter cylinder set, and the filter cylinders 110 and the mounting plate 710 are detachably connected and mounted. It can be understood that, according to the filtering requirement for the gas, only one filter cylinder group may be provided, or a plurality of filter cylinder groups may be provided, for example, a housing of the main body 700 is expanded at the front and back of the main body 700 around the static pressure chamber 500, and another two symmetrically disposed filter cylinder groups are provided in the expanded housing, in this case, the chemical filter includes four filter cylinder groups, and correspondingly, the high efficiency filter 600 is installed at the air outlet of the expanded housing, so as to further filter and discharge the gas.

It will be appreciated that the filter cartridges may be arranged in a number of different ways in the arrangement of the groups of filter cartridges, and that other than the 4 x 3 arrangement of the present embodiment, the filter cartridges may be arranged in a combination of 3 x 3, 4 x 4, etc., as long as the requirements for gas filtration are met. The filter cartridge 110 can be filled with different media for different filtered gases, for example, for filtering of VOC organics, high adsorptivity activated carbon can be selected as the filter media; for the filtration of gases such as carbon dioxide, carbon monoxide and methane, zeolite molecular sieves can be selected as a filter medium; according to different situations, the filter media such as alumina, ion exchange resin, silica gel and the like are all selectable, and the components of the filter media can be not only single, but also compounded by a plurality of filter media. The filtration requirements for gases in different gas environments can be met through multiple combination arrangements of the filter cartridges 110 and composite selection of the filter media.

In a further embodiment of the present invention, the material of the filter cartridge 110 may be stainless steel, or galvanized or plastic. The filter cartridge 110 made of stainless steel has better corrosion resistance, fire resistance and heat resistance, and ensures that the gas filtering device can normally work in a poorer working environment; in addition, the wear resistance and cleanability of the stainless steel allow the filter cartridge 110 to be recycled for multiple times, extending the life of the filter cartridge 110. The galvanized material has strong corrosion resistance and can well deal with the filtration of gas in an acidic or alkaline environment; the plating layer is durable and can be maintained for 50 years at most without repair; the coating has strong toughness, and can well deal with the mechanical damage generated in the daily use or replacement process of the carbon cylinder. The plastic material is stable in corrosion resistance and is also suitable for working in an acidic or alkaline gas environment; the weight is light, the load on the fixed part is low, and the disassembly and the replacement are easy; the plasticity is strong, the processing technology is good, the forming is easy, and compared with a metal material, the cost is lower. The filter cartridge 110 can be made of different materials according to the pH value and the working environment temperature of the actual gas environment.

In a further embodiment of the present invention, the airing holes of the filter cartridge 110 include a circular hole, a square hole, a slot-shaped hole, and the like. Referring to fig. 4, it can be seen that the filter cartridge 110 has air holes distributed on the surface thereof and uniformly arranged in a circular hole shape, and after the gas flows into the carbon cartridge 110 through the air holes 713, the gas is filtered by the filter medium and the filtered gas is discharged through the air holes. It can be understood that the air holes can be not only round holes as shown in the figure, but also square holes or slot holes, and the like, as long as the air can be discharged on the premise of ensuring that the filter medium is not leaked.

Referring to fig. 7, in a further embodiment of the present invention, the main body further includes a mounting plate 710, the mounting plate 710 is fixedly connected to the housing of the main body 700, the mounting plate 710 is located in the air passage, the mounting plate 710 is provided with air holes 713 and mounting holes 711, and the mounting holes include an insertion hole 7111 and a limit hole 7112 for detachably mounting the filter cartridge set.

Referring to fig. 1, two mounting plates 710 are symmetrically mounted in the air duct around the hydrostatic chamber 500, and the mounting plates 710 are connected to the housing through bolts and bolt holes on the housing, it can be understood that the mounting plates 710 are used with a filter cartridge group, and the specific number of the mounting plates 710 is increased or decreased correspondingly with the number of the filter cartridge group. Referring to fig. 2 and 4, 12 ventilation holes 713 are uniformly distributed on the mounting plate 710 in four rows and three columns according to the design of the filter cylinder group, the ventilation holes 713 are used for positioning the mounting position of the filter cylinder 110 and guiding the gas to accurately flow into the filter cylinder 110, the gas flows into the filter cylinder 110 through the ventilation holes 713, and the gas flows out of the ventilation holes uniformly distributed on the filter cylinder 110 after being adsorbed by the filter medium. It will be appreciated that the number and positional arrangement of the louvers 713 will vary accordingly with the number and positional arrangement of the filter cartridges in the filter cartridge group. Referring to fig. 7, the mounting hole 711 is circumferentially disposed around the air hole 713, and a smaller end of the insertion hole 7111 extends out of a limiting hole 7112 along the circumferential direction of the air hole 713, and the mounting hole 711 is used for being clamped and limited by the clamping head 120 of the filter cartridge 110.

Referring to fig. 4 to 8, in a further embodiment of the present invention, the clamping head 120 of the filter cartridge 110 includes an attachment post 122 and a retaining head 121, and the retaining head 121 is fixed to one end of the attachment post 122.

The clamping head 120 is fixedly connected to the air inlet of the filter cartridge 110 through a bolt, the diameter of the connecting column 122 is smaller than that of the limiting head 121, and the connecting column 122 connects the limiting head 121 with the main body of the clamping head 120. Referring to fig. 8, the clamping head 120 and the mounting hole 711 are clamped and assembled, and it can be seen from the figure that the width of the mounting hole 711 is greater than the diameter of the connecting post 122, the width of the insertion hole 7111 is greater than the diameter of the limiting head 121, and the width of the limiting hole 7112 is less than the diameter of the limiting head 121. When carrying out the joint, earlier aim at spacing head 121 with patchhole 7111 and insert, clockwise rotation cartridge filter 110 again, bayonet joint 120 is along with cartridge filter 110 clockwise turning this moment, and spliced pole 122 removes to the end of spacing hole 7112 from patchhole 7111, and because the diameter of spacing head 121 is greater than the width of spacing hole 7112 this moment, spacing head 121 blocks, guarantees cartridge filter 110 and firmly installs on mounting panel 710. When the filter cartridge 110 needs to be disassembled, the filter cartridge 110 is rotated counterclockwise, the connecting column 122 is moved to the insertion hole 7111 from the end of the limiting hole 7112, and at the moment, the limiting head 121 is aligned with the insertion hole 7111, so that the filter cartridge 110 can be pulled out, and the disassembly is completed. Through the cooperation of joint 120 and mounting panel 710, can accomplish the location and the installation of filter cartridge group fast, the installation with dismantle convenient and fast, can realize wasing filter media's quick replacement and cartridge filter 110's dismantlement.

In some embodiments of the utility model, the primary filter 300 is removably attached to the housing of the main body 700.

Referring to fig. 1 and 3, in a further embodiment of the present invention, the main body 700 further includes a sliding rail 740, the sliding rail 740 is located in the air duct between the grating plate 730 and the fan 200 and is circumferentially arranged along an inner wall of the housing of the main body 700, the main body 700 further includes a sliding door 720, the housing at the sliding rail 740 is provided with a cleaning opening communicated with the air duct, the sliding door 720 is located at the cleaning opening, and the sliding door 720 is used for opening or closing the cleaning opening.

The slide rail 740 can be divided into a slide rail upper part 741 and a slide rail lower part 742, the slide rail lower part supports the primary filter 300 and is used for placing the primary filter 300, the slide rail upper part 741 has limiting and protecting effects and limits the upward movement of the primary filter 300, so as to prevent the primary filter 300 from moving up and down in the housing due to external force during the movement process of the gas filtering device, such as transportation, and thus damage to the primary filter 300 is caused, and meanwhile, the primary filter 300 is kept at a correct working position.

When the primary filter 300 needs to be placed, the sliding door 720 is pulled open, the primary filter 300 is pushed into the sliding rail 740 through the cleaning opening, and the sliding door is closed after the primary filter 300 slides to the accurate working position in the sliding rail 740, so that the primary filter 300 is placed. Correspondingly, when the primary filter 300 needs to be taken out, the sliding door 720 is opened, and the primary filter 300 is pulled out along the sliding rail, so that the primary filter can be taken out. Through setting up slide rail 740, placing and taking out convenient and fast of primary filter 300, when primary filter 300 laying dust reachs the upper limit, can dismantle primary filter 300 fast, wash primary filter 300, but reuse nature is strong, practices thrift the time of changing.

As a modification of the above, the sliding door 720 further includes a sliding door switch 721, and the sliding door switch 721 ensures that the sliding door 720 is locked when closed, thereby restricting the movement of the primary filter 300 on the side of the washing port. The sliding door switch 721 can prevent the sliding door 720 from being opened accidentally or prevent the sliding door 720 from being knocked open when the primary filter 300 slides in the slide rail 740 under stress, so that the primary filter 300 slides out of the cleaning opening, and the primary filter 300 is damaged or lost.

In some embodiments of the present invention, the high efficiency filter 600 is detachably fixed to the housing of the main body 700. Referring to fig. 1 and 9, it should be noted that fig. 9 conceals the high efficiency filter for convenience of expression. The inner wall of casing is equipped with spacing step 750, and spacing step 750 can support holding spacingly to high efficiency filter 600, prevents that high efficiency filter 600 from following to slide near chemical filter direction. When installing high efficiency filter 600, aim at the exhaust vent with high efficiency filter 600, push into the air flue of casing in, after high efficiency filter 600 pushed certain degree of depth, support with spacing step 750 and hold, high efficiency filter 600 reachs predetermined mounted position this moment, reuse fastener 800 with high efficiency filter 600 and casing fixed connection. Correspondingly, when the high efficiency filter 600 is disassembled, the high efficiency filter 600 can be taken out only by disassembling the fastening piece 800.

As a modification of the above, the fastener 800 further includes a pressing member 801 and a knob 802, the knob 802 is screwed to the pressing member 801, and the pressing member 801 can be moved toward or away from the housing by rotating the knob 802. The pressing member 801 can abut against the side of the high efficiency filter far from the housing, and the high efficiency filter 600 can be fixed on the housing by rotating the knob 802.

Through the limit step 750 and the fastener 800 which are arranged on the shell, the high-efficiency filter can be quickly mounted and dismounted, the cleaning and replacement of the high-efficiency filter and the dismounting and replacement of the chemical filter are facilitated, the replacement time is saved, and the reusability is strong. By providing knob 820, installation and removal of high efficiency filter 600 may be accomplished without the use of additional tools.

In some embodiments of the present invention, the air duct further comprises a static pressure chamber 500, the fan 200 is located in the air duct, and the static pressure chamber 500 is located between the fan 200 and the chemical filter 100.

Specifically, referring to fig. 1, the fan 200 is located in the air passage at the upper end of the primary filter 300, and after the air flows through the primary filter 300, the air is lifted upwards by the fan 200, and due to the mechanical energy influence of the fan 200, the dynamic pressure of the air is large, the air flow vibration is strong, so that large noise is generated, the air flow is uneven, the filtering effect of the chemical filter 100 is affected, and therefore a static pressure cavity 500 is formed between the fan 200 and the chemical filter 100. The static pressure chamber 500 can convert partial dynamic pressure of gas into static pressure, so that the air outlet of the gas is uniform, the air volume is average, each filter cartridge 110 is effectively utilized, and meanwhile, the air flow vibration and the noise are reduced.

In some embodiments of the present invention, the housing further comprises a grill panel 730, and the grill panel 730 is provided with a plurality of air inlet holes. Specifically, referring to fig. 1, a grill plate 730 is disposed at a lower portion of a main body 700, grill stripes of the grill plate 730 are transversely disposed, air inlet holes are disposed at the grill stripes, and air is driven by a fan 200 to flow into an air passage from the air inlet holes. Through setting up grid plate 730, block external bulky debris, for example cotton fibre, packing paper tape etc. prevent simultaneously that animals such as mouse from getting into inside the gas filtering device, cause the damage to the device.

In some embodiments of the present invention, the gas filtering apparatus further includes a caster 400 disposed on a bottom surface of the housing of the main body 700. Referring to fig. 1, the caster 400 is disposed on the bottom surface of the housing, and the gas filtering device can be quickly moved to a place or a vehicle where gas filtering is required by the caster 400, so that the device can be conveniently transported; meanwhile, the gas filtering device is easy to move to an area with higher gas pollution degree, the situation that only local purification is carried out due to difficulty in moving is avoided, and the utilization rate of the gas filtering device is improved.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

Claims

1. A gas filtration device, comprising:

2. The gas filtration device of claim 1, wherein the chemical filter comprises a filter cartridge set comprising a plurality of side-by-side filter cartridges removably secured to the housing, the filter cartridges being filled with a filter media.

3. The gas filtering device according to claim 2, wherein the main body further comprises a mounting plate fixedly connected to the housing, the mounting plate is located in the air passage, the mounting plate is provided with air holes and mounting holes, and the filter cartridge comprises a snap fitting fixedly snapped into the mounting holes.

4. The gas filtering device according to claim 3, wherein the clamping head comprises a connecting column and a limiting head, the limiting head is fixed at one end of the connecting column, the width of the mounting hole is larger than the diameter of the connecting column, the mounting hole comprises an insertion hole and a limiting hole, the width of the insertion hole is larger than the diameter of the limiting head, the width of the limiting hole is smaller than the diameter of the limiting head, the connecting column is inserted into the mounting hole, and the connecting column can move from the insertion hole into the limiting hole.

5. The gas filtration device of claim 1, wherein the primary filter is removably attached to the housing.

6. The gas filtering device according to claim 5, wherein the main body further comprises a slide rail fixedly connected with the housing, the slide rail is located in the air passage, the primary filter can slide along the slide rail, the housing further comprises a sliding door, the housing is provided with a cleaning opening communicated with the air passage at the slide rail, and the sliding door is used for closing or opening the cleaning opening.

7. The gas filtration device of claim 1, wherein the high efficiency filter is removably secured to the housing.

8. The gas filtering device according to claim 1, wherein a plurality of air outlets are provided, and the chemical filter and the high-efficiency filter are provided in the air passage corresponding to each air outlet.

9. The gas filtration device of claim 1, wherein the air passageway further comprises a static pressure chamber, the blower being located in the air passageway, the static pressure chamber being located between the blower and the chemical filter.

10. The gas filtering device according to claim 1, wherein said housing further comprises a grill plate provided with a plurality of said air inlet holes.