CN219815651U - Filter equipment, electrostatic purification device and oil smoke clean system - Google Patents

Abstract

The utility model relates to the technical field of kitchen electricity, in particular to a filtering device, an electrostatic purifying device and a lampblack purifying system. The utility model provides a filtering device which comprises a shell, a filtering mechanism and a driving mechanism, wherein the filtering mechanism comprises at least two filter screens, the at least two filter screens are arranged on the shell and are distributed along the flowing direction of fluid, and the driving mechanism is used for adjusting the position of at least one filter screen so as to adjust the opening ratio of the filtering mechanism. The electrostatic purifying device is convenient to adjust the aperture ratio according to working conditions, so that the resistance and the purifying efficiency of the purifier of the electrostatic purifying device can be flexibly adjusted. For high-concentration oil fume, the low aperture ratio is selected, so that a better filtering effect on the oil fume is realized, and the purifying efficiency and purifying effect of the electrostatic purifying device are improved. Aiming at low-concentration oil smoke, high aperture ratio is selected, and under the premise that the filtering effect is satisfied, the resistance of an oil smoke purifying system is effectively reduced, the good smoke discharging effect of the oil smoke purifying system is ensured, and the occurrence of smoke returning and odor mixing problems is avoided.

Description

Filter equipment, electrostatic purification device and oil smoke clean system

Technical Field

The utility model relates to the technical field of kitchen electricity, in particular to a filtering device, an electrostatic purifying device and an oil fume purifying system.

Background

Along with the increasing importance of environmental protection, no matter be domestic kitchen, or large-scale hotel, unit dining room etc. generally all have the installation purification equipment system that discharges fume, filter the oil smoke of purifying the public flue in unison and then discharge. Under the circumstance, a large smoke exhaust fan is usually required to be arranged on a main fan on the roof, and a complete smoke purifying system is matched, wherein the smoke purifying system is added with different collocation modes such as an electrostatic purifying device, an ion purifier, an odor purifier and other equipment systems, and the electrostatic purifying device is used for purifying smoke particles.

The air inlet end of the electrostatic purifying device is generally provided with a layer of net-shaped mechanical filter screen structure, and the mechanical filter screen structure is used for primary filtration of large-particle oil smoke and particles. Among the net-shaped mechanical filter screen structures, the pore plate net has relatively high efficiency, and becomes the most commonly used filter screen structure. The size of the openings in the cell plate mesh directly affects the purifier resistance and purification efficiency. However, once the existing orifice plate net is selected, the existing orifice plate net cannot be replaced at any time, and flexible adjustment of the resistance and the purification efficiency of the purifier according to working conditions is inconvenient. Too large openings can lead to reduced purification efficiency and unqualified oil smoke emission; if the holes are too small, the system resistance is increased, the load of the fan is increased, and the problems of poor smoke discharging effect and smoke returning and odor mixing are caused.

Therefore, there is a need to design a new filtering device, electrostatic purifying device and oil fume purifying system to improve the above problems.

Disclosure of Invention

The first object of the utility model is to provide a filter device, which is convenient for adjusting the aperture ratio of the filter device according to working conditions so as to realize flexible adjustment of the resistance and the purification efficiency of a purifier of the filter device.

To achieve the purpose, the utility model adopts the following technical scheme:

a filtration device comprising:

a housing;

the filtering mechanism comprises at least two filter screens which are arranged on the shell and are distributed along the flowing direction of the fluid; and

and the driving mechanism is configured to adjust the position of at least one filter screen so as to adjust the opening rate of the filtering mechanism.

Preferably, the filtering mechanism includes:

the first filter screen is fixedly connected with the shell; and

the second filter screen is arranged on the shell and is distributed with the first filter screen along the flowing direction of the fluid, the driving mechanism can drive the second filter screen to move along the first direction relative to the shell, and the first direction is perpendicular to the flowing direction of the fluid.

As a preferable scheme, the shell is provided with:

the guide groove is formed by extending the side surface of the shell along the first direction towards the inside of the shell, and the second filter screen is inserted into the guide groove and can slide along the guide groove.

Preferably, the driving mechanism includes:

the driving motor comprises a body and a rotating shaft, wherein the rotating shaft is arranged on the body and extends along a second direction, and the fluid flowing direction, the first direction and the second direction are perpendicular to each other;

the reversing mechanism is arranged between the rotating shaft and the second filter screen and can convert the rotation of the rotating shaft into the movement of the second filter screen along the first direction.

Preferably, the reversing mechanism includes:

the cam is fixedly connected with the rotating shaft; and

and a return member configured to bring the second screen into contact with the outer peripheral surface of the cam at all times.

Preferably, one end of the resetting piece is abutted to the shell, and the other end of the resetting piece is fixedly connected with one side, away from the cam, of the second filter screen.

Preferably, the number of the resetting pieces is at least two, and the resetting pieces are at least two and are distributed at equal intervals along the second direction.

Preferably, the reversing mechanism includes:

a gear coaxially fixed to the rotation shaft; and

and the rack is meshed with the gear and fixedly connected with the second filter screen, and the rack extends along the first direction.

Preferably, the filtering device further comprises:

and the oil smoke detection mechanism is arranged at the upstream and/or downstream of the filtering mechanism.

The second object of the utility model is to provide an electrostatic purifying device, which is convenient for the filtering device to adjust the aperture ratio according to the working condition so as to realize flexible adjustment of the resistance and the purifying efficiency of the purifier of the electrostatic purifying device.

To achieve the purpose, the utility model adopts the following technical scheme:

an electrostatic cleaning device comprising a filter device as described above.

The third object of the utility model is to provide a fume purifying system, which aims at high-concentration fume and selects low aperture ratio, thereby ensuring that a better fume filtering effect is realized and improving the purifying efficiency and purifying effect of a filtering device. The low-concentration oil smoke filter has the advantages that the high aperture ratio is selected for low-concentration oil smoke, the resistance of the oil smoke purifying system can be effectively reduced on the premise that the filtering effect is met, the good smoke discharging effect of the oil smoke purifying system is ensured, and the problem of smoke returning and odor mixing is avoided.

To achieve the purpose, the utility model adopts the following technical scheme:

a fume purification system comprising a filtration device as described above or an electrostatic purification as described above.

The utility model has the beneficial effects that:

the utility model provides a filtering device which comprises a shell, a filtering mechanism and a driving mechanism, wherein the filtering mechanism comprises at least two filter screens, the at least two filter screens are arranged on the shell and are distributed along the flowing direction of fluid, and the driving mechanism is used for adjusting the position of at least one filter screen so as to adjust the opening ratio of the filtering mechanism. The filter device is convenient to adjust the aperture ratio according to working conditions, so that the flexible adjustment of the resistance and the purification efficiency of the purifier of the filter device is realized. Specifically, for high-concentration oil smoke, a low aperture ratio is selected, so that a better filtering effect on the oil smoke is guaranteed, and the purifying efficiency and the purifying effect of the filtering device are improved. The low-concentration oil smoke filter has the advantages that the high aperture ratio is selected for low-concentration oil smoke, the resistance of the oil smoke purification system can be effectively reduced on the premise that the filtering effect is met, the load of a fan is reduced, the good smoke discharging effect of the oil smoke purification system is ensured, and the problem of smoke returning and odor mixing is avoided.

The electrostatic purifying device provided by the utility model comprises the filtering device, and aims at low-concentration oil smoke, and the high aperture ratio is selected, so that the resistance of the oil smoke purifying system can be effectively reduced, the load of a fan is reduced, the good smoke discharging effect of the oil smoke purifying system is ensured, and the occurrence of smoke returning and odor mixing problems is avoided on the premise that the filtering effect is satisfied.

The oil fume purifying system provided by the utility model is convenient for the filtering device to adjust the aperture ratio according to the working condition, so as to realize flexible adjustment of the resistance and the purifying efficiency of the purifier of the filtering device. Specifically, for high-concentration oil smoke, a low aperture ratio is selected, so that a better filtering effect on the oil smoke is realized, and the purification efficiency and the purification effect of the oil smoke purification system are improved. The low-concentration oil smoke filter has the advantages that the high aperture ratio is selected for low-concentration oil smoke, the resistance of the oil smoke purification system can be effectively reduced on the premise that the filtering effect is met, the load of a fan is reduced, the good smoke discharging effect of the oil smoke purification system is ensured, and the problem of smoke returning and odor mixing is avoided.

Drawings

Fig. 1 is a schematic structural diagram of a fume purification system according to a first embodiment of the present utility model;

fig. 2 is a schematic diagram of a partial structure of a fume purification system according to a first embodiment of the present utility model;

FIG. 3 is a schematic view of a first embodiment of a filtering device in a first state;

fig. 4 is a schematic structural diagram II of a filtering device in a first state according to a first embodiment of the present utility model;

FIG. 5 is a schematic view of a first embodiment of a filtering device in a second state;

fig. 6 is a schematic structural diagram II of a filtering device in a second state according to the first embodiment of the present utility model;

FIG. 7 is an enlarged view of a portion of FIG. 3 at C;

FIG. 8 is a partial enlarged view at D in FIG. 5;

FIG. 9 is a cross-sectional view at A-A in FIG. 3;

FIG. 10 is a cross-sectional view at B-B in FIG. 5;

fig. 11 is a schematic partial structure of a filtering device according to a second embodiment of the present utility model.

In the figure:

1000. a fume purification system;

100. an electrostatic cleaning device; 200. a purge channel inlet; 300. purifying the ventilation pipeline; 400. a fan control mechanism;

110. a filtering device; 120. a case body;

10. a housing; 11. a guide groove;

20. a filtering mechanism; 21. a first filter screen; 211. a first filter hole; 22. a second filter screen; 221. a filter screen body; 2211. a second filter hole; 222. an abutting portion;

30. a driving mechanism; 31. a driving motor; 311. a body; 312. a rotation shaft; 32. a reversing mechanism; 321. a cam; 322. a reset member; 323. a gear; 324. a rack;

40. and the oil smoke detection mechanism.

Detailed Description

The technical scheme of the utility model is further described below with reference to the attached drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", etc., azimuth or positional relationship are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description and simplification of operations, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Example 1

As shown in fig. 1 and 2, an embodiment of the present utility model provides a fume purification system 1000, where the fume purification system 1000 includes a purification passage inlet 200, an electrostatic purification device 100, a purification ventilation duct 300 and a blower control mechanism 400 connected in sequence, and the blower control mechanism 400 includes a blower, and when the blower is started, fume is sucked by negative pressure at the inlet of the purification passage inlet 200, flows into the purification ventilation duct 300 and the blower control mechanism 400 after passing through the electrostatic purification device 100, and is discharged outside. Wherein the electrostatic purifying device 100 is used for purifying soot particles.

The air inlet end of the electrostatic purifying device 100 is generally provided with a layer of net-shaped mechanical filter screen structure, and the mechanical filter screen structure performs primary filtration of large-particle oil smoke and particles. Among the net-shaped mechanical filter screen structures, the pore plate net has relatively high efficiency, and becomes the most commonly used filter screen structure. The size of the openings in the cell plate mesh directly affects the purifier resistance and purification efficiency. However, once the existing orifice plate net is selected, the existing orifice plate net cannot be replaced at any time, and flexible adjustment of the resistance and the purification efficiency of the purifier according to working conditions is inconvenient. Too large openings can lead to reduced purification efficiency and unqualified oil smoke emission; if the holes are too small, the system resistance is increased, the load of the fan is increased, and the problems of poor smoke discharging effect and smoke returning and odor mixing are caused.

In order to solve the above-described problems, as shown in fig. 3 to 6, the electrostatic purifying apparatus 100 of the embodiment of the present disclosure includes a filter device 110 and a case 120, and the filter device 110 is disposed on the case 120. The filtering device 110 includes a housing 10, a filtering mechanism 20, and a driving mechanism 30, wherein the filtering mechanism 20 includes at least two filter screens, the at least two filter screens are disposed on the housing 10 and are arranged along a flowing direction of the fluid, and the driving mechanism 30 is used for adjusting a position of at least one filter screen so as to adjust an opening ratio of the filtering mechanism 20. The electrostatic purifying device 100 is convenient to adjust the aperture ratio according to working conditions, so that the flexible adjustment of the resistance and the purifying efficiency of the purifier of the electrostatic purifying device 100 is realized. Specifically, for high-concentration oil smoke, a low aperture ratio is selected, so that a good filtering effect on the oil smoke is guaranteed, and the purifying efficiency and purifying effect of the electrostatic purifying device 100 are improved. The low-concentration oil smoke filter has the advantages that the high aperture ratio is selected for low-concentration oil smoke, the resistance of the oil smoke purifying system 1000 can be effectively reduced on the premise that the filtering effect is met, the load of a fan is reduced, the good smoke discharging effect of the oil smoke purifying system 1000 is ensured, and the problem of smoke returning and odor mixing is avoided.

Specifically, as shown in fig. 2, the electrostatic purifying apparatus 100 further includes a fume detecting mechanism 40, where the fume detecting mechanism 40 is disposed upstream and/or downstream of the filtering mechanism 20, so as to accurately detect the concentration of fume passing through the electrostatic purifying apparatus 100, and facilitate accurate adjustment of the aperture ratio by the electrostatic purifying apparatus 100 according to the detected result of the fume detecting mechanism 40.

As shown in fig. 3 to 6, the filtering mechanism 20 includes a first filter screen 21 and a second filter screen 22, the first filter screen 21 is fixedly connected with the housing 10, the second filter screen 22 is disposed on the housing 10 and is arranged along the flow direction of the fluid with the first filter screen 21, and the driving mechanism 30 can drive the second filter screen 22 to move along the first direction relative to the housing 10, and the first direction is perpendicular to the flow direction of the fluid, so as to realize rapid adjustment of the aperture ratio of the filtering mechanism 20. Specifically, as shown in fig. 7 and 8, the first filter 21 is provided with a plurality of first filter holes 211, the second filter 22 is provided with a plurality of second filter holes 2211, the first filter holes 211 and the second filter holes 2211 are arranged in the same way, and each first filter hole 211 corresponds to one second filter hole 2211 and has the same size and shape. As shown in fig. 7, when the first filter screen 21 and the second filter screen 22 are in the first state, the first filter holes 211 and the corresponding second filter holes 2211 are completely overlapped, and at this time, the filter mechanism 20 is in the high aperture ratio state, so that a large discharge amount of the filtered gas can be realized. As shown in fig. 8, when the first filter screen 21 and the second filter screen 22 are in the second state, the first filter holes 211 partially overlap with the corresponding second filter holes 2211, and at this time, the filter mechanism 20 is in the low aperture ratio state, so that a good filtering effect on the oil smoke can be achieved.

As shown in fig. 4, 6, 9 and 10, a guide groove 11 is formed in the casing 10, the guide groove 11 is formed by extending the side surface of the casing 10 towards the inside of the casing 10 along the first direction, the second filter screen 22 is inserted into the guide groove 11 and can slide along the guide groove 11, and by means of the arrangement of the guide groove 11, a better guiding effect on the second filter screen 22 moving along the first direction can be achieved, so that the second filter screen 22 is prevented from deflecting or blocking with the casing 10 in the moving process along the first direction. Specifically, the width of the guide groove 11 may be 1mm to 4mm greater than the thickness of the second filter screen 22, so that the second filter screen 22 can be well inserted into the guide groove 11.

The structure of the driving mechanism 30 will be described with reference to fig. 3, 5, and 7 to 10, and as shown in fig. 3, 5, and 7 to 10, the driving mechanism 30 includes a driving motor 31 and a reversing mechanism 32, the driving motor 31 includes a body 311 and a rotating shaft 312, the rotating shaft 312 is disposed on the body 311 and extends in a second direction, the fluid flowing direction, the first direction, and the second direction are perpendicular to each other, and the reversing mechanism 32 is disposed between the rotating shaft 312 and the second screen 22 and is capable of converting the rotation of the rotating shaft 312 into the movement of the second screen 22 in the first direction. Through the arrangement of the driving mechanism 30 with the structure, the arrangement of the body 311 and the second filter screen 22 along the second direction can be realized, the occupation of the driving mechanism 30 in the space in the first direction is reduced, more filtering mechanisms 20 can be arranged in the first direction, and the purifying effect of the electrostatic purifying device 100 is improved.

Specifically, as shown in fig. 3, 5, 9 and 10, the reversing mechanism 32 includes a cam 321 and a reset member 322, the cam 321 is fixedly connected to the rotating shaft 312, the reset member 322 is used for making the second filter screen 22 always contact with the outer circumferential surface of the cam 321, the cam 321 is driven by the driving motor 31 to rotate, and the cam 321 is abutted with the second filter screen 22 to push the second filter screen 22 along the first direction. By providing the reset piece 322, separation of the second screen 22 from the outer circumferential surface of the cam 321 can be avoided. Specifically, as shown in fig. 9 and 10, the second filter screen 22 includes a filter screen body 221 and an abutting portion 222, where the abutting portion 222 is fixedly connected with the filter screen body 221 and is arranged along the first direction, and the filter screen body 221 is always inserted into the housing 10, so as to prevent the oil stain on the filter screen body 221 from being brought to the outside of the housing 10. The contact portion 222 is always in contact with the cam 321, and the contact portion 222 is made of a material having a small friction coefficient, so that the contact portion 222 can slide relatively well against the outer peripheral surface of the cam 321. Further, the end of the abutting portion 222 that contacts the cam 321 includes the convex arc surface, so that the friction force between the abutting portion 222 and the outer periphery of the cam 321 can be further reduced. As a preferred solution, the second filter 22 may further include a roller, where the roller is pivoted to one end of the abutting portion 222 near the cam 321, and the roller abuts against the outer peripheral surface of the cam 321, so that the problem of jamming when the second filter 22 moves relative to the outer peripheral surface of the cam 321 can be further avoided.

Specifically, as shown in fig. 9 and 10, the cam 321 in the embodiment of the disclosure may be preferably a spiral casing rotating shaft structure, where the outer contour of the spiral casing rotating shaft structure has a spiral shape of the spiral casing, and the spiral casing rotating shaft structure can limit the second filter screen 22 at a position with a minimum radius of 0 ° and a position with a maximum radius of 360 °, so that detachment of the second filter screen 22 from the spiral casing rotating shaft structure can be avoided.

As shown in fig. 8 and 9, the scroll rotating shaft structure is at the position of 0 ° with the smallest radius, at this time, the reset piece 322 makes the second filter screen 22 abut against the position with the smallest radius of the scroll rotating shaft structure, at this time, as shown in fig. 9, the area of the second filter screen 22 extending out of the housing 10 is largest, as shown in fig. 8, the first filter holes 211 partially overlap with the corresponding second filter holes 2211, and the filter mechanism 20 is in a low aperture ratio state.

As shown in fig. 7 and 10, the scroll rotating shaft structure is at the position of 360 ° with the largest radius, at this time, the reset piece 322 makes the second filter screen 22 abut against the position with the largest radius of the scroll rotating shaft structure, at this time, as shown in fig. 10, the area of the second filter screen 22 extending out of the casing 10 is the smallest, as shown in fig. 7, the first filter holes 211 are all overlapped with the corresponding second filter holes 2211, and the filter mechanism 20 is in a high aperture ratio state.

As shown in fig. 3 and 5, one end of the reset element 322 abuts against the housing 10, and the other end of the reset element 322 abuts against the side of the second filter screen 22 away from the cam 321, so that the second filter screen 22 can be quickly reset. Specifically, as shown in fig. 7 and 8, the return member 322 may be a spring, a rubber pad, or the like.

As shown in fig. 3 and 5, at least two resetting members 322 are provided, at least two resetting members 322 are arranged at equal intervals along the second direction, and a side, away from the cam 321, of the second filter screen 22 can receive a uniform resetting force, so that stable movement of the second filter screen 22 is ensured. In addition, the reset piece 322 can also play a role in buffering and damping, so that the second filter screen 22 is prevented from generating larger vibration and noise in the moving process.

Example two

As shown in fig. 11, the present embodiment provides an electrostatic purifying apparatus 100, and the structure of the electrostatic purifying apparatus 100 of the embodiment of the present disclosure is substantially the same as that of the electrostatic purifying apparatus 100 of the first embodiment, and the main difference between them is that: the reversing mechanism 32 includes a gear 323 and a rack 324, the gear 323 is coaxially fixed with the rotation shaft 312, the rack 324 is meshed with the gear 323 and fixedly connected with the second filter screen 22, and the rack 324 extends along the first direction. By the cooperation of the gear 323 and the rack 324, the rotation of the rotation shaft 312 around the second direction can be converted into the movement of the second filter screen 22 along the first direction. In addition, the engagement of the gear 323 with the rack 324 ensures accurate positional movement of the second screen 22 in the first direction.

It should be noted that, the body 311 in fig. 11 needs to be fixedly connected to the housing 10 shown in fig. 3 or the box 120 shown in fig. 1.

Of course, in other embodiments, the driving mechanism 30 may be a linear driving mechanism, where the output end of the linear driving mechanism can extend and retract along the first direction, and the linear driving mechanism may be a push rod motor.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (11)

1. A filter device, comprising:

a housing (10);

the filtering mechanism (20) comprises at least two filter screens which are arranged on the shell (10) and are distributed along the flowing direction of the fluid; and

and a driving mechanism (30) configured to adjust the position of at least one of the screens to adjust the aperture ratio of the filtering mechanism (20).

2. The filtering device according to claim 1, wherein the filtering mechanism (20) comprises:

the first filter screen (21) is fixedly connected with the shell (10); and

the second filter screen (22) is arranged on the shell (10) and is distributed with the first filter screen (21) along the flowing direction of the fluid, and the driving mechanism (30) can drive the second filter screen (22) to move along the first direction relative to the shell (10), and the first direction is perpendicular to the flowing direction of the fluid.

3. The filtering device according to claim 2, wherein the housing (10) is provided with:

and a guide groove (11) formed by extending the side surface of the shell (10) towards the inside of the shell (10) along the first direction, wherein the second filter screen (22) is inserted into the guide groove (11) and can slide along the guide groove (11).

4. The filter device according to claim 2, wherein the drive mechanism (30) comprises:

a driving motor (31) comprising a body (311) and a rotating shaft (312), wherein the rotating shaft (312) is arranged on the body (311) and extends along a second direction, and the fluid flow direction, the first direction and the second direction are perpendicular to each other;

and the reversing mechanism (32) is arranged between the rotating shaft (312) and the second filter screen (22) and can convert the rotation of the rotating shaft (312) into the movement of the second filter screen (22) along the first direction.

5. The filtering device according to claim 4, wherein the reversing mechanism (32) comprises:

a cam (321), wherein the cam (321) is fixedly connected with the rotating shaft (312); and

and a return member (322) configured to bring the second screen (22) into contact with the outer peripheral surface of the cam (321) at all times.

6. The filtering device according to claim 5, wherein one end of the resetting piece (322) is abutted to the housing (10), and the other end of the resetting piece (322) is fixedly connected with one side of the second filter screen (22) away from the cam (321).

7. The filter device according to claim 6, wherein the number of return members (322) is at least two, and wherein at least two return members (322) are arranged at equal intervals in the second direction.

8. The filtering device according to claim 4, wherein the reversing mechanism (32) comprises:

a gear (323) coaxially fixed to the rotation shaft (312); and

and the rack (324) is meshed with the gear (323) and fixedly connected with the second filter screen (22), and the rack (324) extends along the first direction.

9. The filter device according to any one of claims 1 to 8, further comprising:

and a fume detection mechanism (40) arranged upstream and/or downstream of the filtering mechanism (20).

10. An electrostatic cleaning apparatus comprising a filter apparatus according to any one of claims 1 to 9.

11. A fume purification system comprising a filter device according to any one of claims 1 to 9 or an electrostatic purification device according to claim 10.