CN212006183U - Air filtering mechanism and fresh air system applying same - Google Patents

Abstract

The utility model discloses an air filter constructs and uses filter structure's new trend system, air filter constructs including the main entrance, dust removal channel, power pack, dust exhausting fan, the main entrance sets up the one-level filter screen, the second grade filter screen, form first cavity between the two, dust removal channel sets up at first cavity, dust exhausting fan is located dust removal channel, power pack drives dust removal channel and removes, dust removal channel sets up carries out the dust absorption mouth of dust absorption to the second grade filter screen, blow the dirt discharge port of dirt to the one-level filter screen, set up the baffle that separates into dust absorption cavity and dust exhaust cavity with dust removal channel in the dust removal channel, the baffle sets up the intercommunicating pore that feeds through dust absorption cavity and dust exhaust cavity, dust exhausting fan's fan goes into wind gap and dust absorption cavity intercommunication, dust exhausting fan's fan air outlet and dust exhaust cavity. The fresh air system is provided with the integrated dust removal channel and cleans the air filtering mechanism, so that smooth work of the fresh air system is guaranteed, and maintenance frequency and cost are reduced.

Description

Air filtering mechanism and fresh air system applying same

Technical Field

The utility model belongs to the technical field of the computer lab new trend technique and specifically relates to indicate an air filter constructs and uses filter mechanism's new trend system.

Background

The research and development of the 5G technology is very hot all over the world at present, and the mainstream standardization organizations at home and abroad recognize the urgency of the development of the 5G technology at the present stage and make related 5G research and development plans. From 4G to 5G, user requirements are continuously improved, indoor and outdoor data services are greatly expanded, carrier frequency is greatly improved, the traditional macro base station is increasingly unable to cope with the indoor and outdoor data services, and in the future 5G era, a small base station inevitably becomes a mainstream on a large scale. Among the 5G key technologies, there is a technology called high-density networking, and the development purpose of the technology is to prepare for the wide-range deployment of the small base station in the future 5G era, so that the coming of the 5G era can really drive the explosive deployment of the small base station.

The fresh air equipment is used for replacing fresh air for the closed space, and is commonly applied to household rooms, public places, factories or data rooms (such as 5G base stations) and the like. The fresh air equipment needs to have the functions of refreshing outdoor air to indoor and filtering and purifying outdoor air. The communication base station has small internal area, large unit heating value and more area of 30-40 square meters. At present, the base station can be provided with a fresh air system, so that equipment in a machine room can operate in a normal temperature range, and the common fresh air system applied to the base station mainly comprises a fan, a filter and other components. The filter needs to be replaced after being applied for a period of time, and needs to be maintained and cleaned regularly by personnel. Most base stations are built in remote areas, the conditions are severe, and mobile stations are widely distributed, so that the base stations are maintained unchanged. In order to solve the above problems, the prior art has appeared a fresh air system with a self-cleaning mechanism, and the common structure is as follows: the dust collection fan is connected with a hose, and the hose sucks dust and the like accumulated on the filter (a filter screen) into the dust collection fan and then discharges the dust through another hose. However, the main disadvantages of such cleaning mechanisms are: in the dust removal process, the hose continuously reciprocates on the net surface of the filter screen, and the connection part of the hose and the dust collection fan is easy to damage after the hose is used for a certain time; in addition, in the process that the hose reciprocates along with the dust collection fan, the problems that the dust collection efficiency is reduced and even dust cannot be collected due to poor contact with the filter screen are easily caused by the problems of pipeline aging, deformation and the like. Therefore, the design of the self-cleaning mechanism of the existing fresh air system is not ideal.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an air filter constructs and uses filter mechanism's new trend system in order to solve a great deal of problem of prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an air filtering mechanism comprises a main channel formed with an air filtering cavity, wherein the main channel is provided with an air inlet and an air outlet, the main channel is provided with a primary filter screen with a larger mesh and a secondary filter screen with a smaller mesh at intervals from the air inlet to the air outlet, a first cavity is formed between the primary filter screen and the secondary filter screen, the air filtering mechanism further comprises a dust removing channel, a power unit and a dust removing fan, the dust removing channel is arranged in the first cavity, the dust removing fan is positioned in the dust removing channel, the power unit is arranged on the main channel and can drive the dust removing channel to reciprocate, the dust removing channel is provided with a dust suction port for sucking dust of the secondary filter screen and a dust exhaust port for blowing dust to the primary filter screen, a partition board is arranged in the dust removing channel and divides the dust removing channel into a dust suction cavity communicated with the dust suction port and a dust exhaust cavity communicated with the dust exhaust, the baffle sets up the intercommunicating pore that communicates dust absorption cavity and dust exhaust cavity, dust exhausting fan sets up fan income wind gap and fan air outlet, and dust exhausting fan's fan income wind gap directly communicates with dust absorption cavity, dust exhausting fan's fan air outlet and dust exhaust cavity direct intercommunication.

Furthermore, the dust removal channel includes the dust removal box, the dust removal box has a lateral wall, the dust absorption cavity has a dust absorption wind-guiding surface, the dust absorption wind-guiding surface by dust absorption mouth is gone into the wind gap slope towards dust removal fan's fan and is extended, form the dust absorption pressure boost chamber that is gone into wind gap to the increase of dust absorption mouth pressure by the fan between dust absorption wind-guiding surface and the lateral wall that corresponds.

Further, the dust removal passageway is including the dust removal box, the dust removal box has an lateral wall, the dust exhaust cavity has a dust exhaust air guide surface, the dust exhaust air guide surface is by dust exhausting fan's air outlet orientation the slope of dust exhaust mouth extends, form the dust exhaust pressure boost chamber by fan air outlet to the increase of dust exhaust mouth pressure between dust exhaust air guide surface and the lateral wall that corresponds.

Furthermore, the dust removal fan is arranged in the dust exhaust cavity, and a fan air inlet of the dust removal fan is opposite to the communication hole.

Further, the dust removal box body includes the roof that faces the one-level filter screen, the diapire that faces the second grade filter screen and connects the lateral wall between roof and diapire, the dust absorption mouth forms between diapire and the lateral wall that corresponds, the dust exhaust mouth form between roof and the lateral wall that corresponds, the length of dust absorption mouth with the length of side of this length direction of correspondence of filter screen is the same, the dust absorption mouth is followed dust removal passageway is at the direction reciprocating motion of perpendicular dust absorption mouth length.

Furthermore, the dust removal channel is provided with two dust collection ports and two dust collection air guide surfaces, the two dust collection ports are respectively located at two ends of the width direction of the dust removal channel, the two dust collection air guide surfaces are intersected and closed, and the dust collection cavity is formed by surrounding the dust removal box body, the dust collection air guide surfaces and the partition plate together.

Furthermore, the dust removal channel is only provided with one dust collection port, the dust collection port is positioned at one end of the dust removal channel in the width direction, and the stroke of the dust collection port is larger than or equal to the width of the secondary filter screen in the stroke direction.

Furthermore, a guide mechanism is arranged on the outer side of the dust removal channel, and a guide rail for guiding the guide mechanism to move is arranged on the main channel along the reciprocating movement direction of the dust removal channel.

Furthermore, the main channel is provided with a dust brush at a position corresponding to the dust collection port, a brush head of the dust brush is in contact with the secondary filter screen, and a gap is formed between the dust collection port and the secondary filter screen.

Further, the utility model also provides a new trend system, include as above arbitrary the filtration mechanism and new trend cavity, new trend fan, new trend cavity and air outlet intercommunication, new trend fan will be through the filtration of filtration mechanism in the new trend gas introduction new trend cavity.

The beneficial effects of the utility model reside in that: the air filtering mechanism of the fresh air system of the utility model is provided with the dust removal channel which moves back and forth and cleans the air filtering mechanism, thereby ensuring the smooth work of the fresh air system and reducing the maintenance frequency and cost; compared with the existing fresh air system, the dust removal channel is arranged, a connecting hose is not required to be additionally arranged, the dust removal fan is integrated with the dust collection port and the dust exhaust port through the integral dust removal channel, no connecting dead angle exists, dust accumulation and blockage in the channel are not easy to happen, the installation is convenient, the structural stability is high, and the service life is longer; the dust removal channel is divided into a dust collection chamber and a dust discharge chamber which are communicated with each other through the partition plate, so that negative pressure is formed in the dust collection chamber, and dust is conveniently sucked and discharged; the dust collection air guide surface and the dust discharge air guide surface are utilized to guide sucked dust and discharged dust along the corresponding air guide surfaces in a concentrated manner, so that the dust collection efficiency is higher, and the phenomenon of dust accumulation at the corners inside the channel is avoided; the inside dust absorption pressure boost chamber and the dust exhaust pressure boost chamber that form of passageway can form bigger dust absorption power and dust exhaust power at dust absorption mouth and dust exhaust mouth under the equal efficiency's of dust exhausting fan the condition, and dust collection efficiency is high.

Drawings

Fig. 1 is a schematic structural view of the air filtering mechanism of the present invention.

Fig. 2 is a partially enlarged view of a portion a of the drawing.

Fig. 3 is a schematic structural view of the dust removal channel.

Fig. 4 is a cross-sectional view of a dust removal passage.

FIG. 5 shows a dust removal passage

Reference numerals: 1. the device comprises a main channel, 2, a filtering chamber, 3, a primary filter screen, 4, a secondary filter screen, 5, a first chamber, 6, a dust removal channel, 7, a power unit, 8 and a dust removal fan; 9. a guide mechanism;

10. the dust sweeping brush 11, the air inlet 12, the air outlet 13, the fresh air chamber 14 and the fresh air fan;

61. the dust collection device comprises a dust collection port 62, a dust discharge port 63, a partition plate 64, a dust collection chamber 65, a dust discharge chamber 66, a dust collection box body 67, a dust collection air guide surface 68 and a dust discharge air guide surface;

631. a communicating hole 661, an outer side wall 662, a top wall 663, a bottom wall 671, a dust-collecting pressurizing cavity 681 and a dust-discharging pressurizing cavity;

81. fan air inlet, 82, fan air outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The invention will be further described with reference to the accompanying drawings.

In order to solve the technical problem, the utility model provides an air filter constructs and uses air filter constructs's new trend system is in order to solve a great deal of problem of prior art.

As shown in fig. 1-5, do an air filter mechanism's a preferred embodiment, including main entrance 1, main entrance 1 is formed with air filter cavity 2, main entrance 1 has air intake 11 and air outlet 12, main entrance 1 is by air intake 11 to 12 spaced installs the great one-level filter screen of mesh 3, the less second grade filter screen of mesh 4 of air intake 11 to air outlet, form first cavity 5 between one-level filter screen 3, the second grade filter screen 4, air filter mechanism still includes dust removal channel 6, power pack 7, dust exhausting fan 8, and dust removal channel 6 sets up in this first cavity 5, and dust exhausting fan 8 is located dust removal channel 6, power pack 7 installs on main entrance 1 and can drive dust removal channel 6 reciprocating motion. Dust removal passageway 6 sets up carries out the dust absorption mouth 61 of dust absorption, blows the dust exhaust mouth 62 of dirt to one-level filter screen 3 to second grade filter screen 4, set up baffle 63 in the dust removal passageway 6, baffle 63 separates dust removal passageway 6 into the dust absorption cavity 64 that communicates with dust absorption mouth 61 to and the dust exhaust cavity 65 with dust exhaust mouth 62 intercommunication, baffle 63 sets up the intercommunicating pore 631 that communicates dust absorption cavity 64 and dust exhaust cavity 65, dust exhausting fan 8 sets up the fan and goes into wind gap 81 and fan air outlet 82, and dust exhausting fan 8's fan goes into wind gap 81 and dust absorption cavity 64 direct intercommunication, dust exhausting fan 8's fan air outlet 82 and dust exhaust cavity 65 direct intercommunication.

The power unit 7 may be a cylinder, a motor (e.g., a servo motor). The air filtering mechanism can be further provided with a position sensor and a controller, and the position sensor and the power unit 7 are connected with the controller. The position sensors may be provided at the power output of the power unit or at both ends of the main channel. In this embodiment, the control unit 7 is a servo motor, and the controller controls the main shaft of the servo motor to rotate forward or backward by receiving a position signal from the position sensor, so as to drive the dust removal channel 6 to move back and forth. And a guide mechanism 9 is arranged on the outer side of the dust removing channel 6, and a guide rail for guiding the guide mechanism 9 to move is arranged on the main channel 1 along the reciprocating movement direction of the dust removing channel 6. The guiding mechanism 9 may be a roller, a guide groove, a guide rod, or the like, which is conventional in the art. The dust removing fan 8 can be a centrifugal fan or an axial flow fan, and the attached figure 2 shows the structure of the air filtering mechanism when the centrifugal fan is used as the dust removing fan. Specifically, the method comprises the following steps: as shown in fig. 2, the primary filter screen 3 and the secondary filter screen 4 are horizontally disposed in the main channel 1, the dust removal channel 6 is perpendicular to the main channel 1, the dust suction port 61 and the dust discharge port 62 are disposed at two ends of the dust removal channel 6, and the main shaft of the dust removal fan 8 is perpendicular to the extension direction L of the dust removal channel 6. Fig. 5 shows the structure of the dust removing passage 6 when the dust removing fan 8 is an axial flow fan.

The dust removal channel 6 comprises a dust removal box body 66, the shape of the dust removal box body 66 is not limited, the dust removal box body can be a cylinder, a cube channel, a cuboid channel or other special-shaped structures, and the like, and in the embodiment, the dust removal box body 6 is of a cuboid structure.

In this embodiment, as shown in fig. 2, the dust removing box 66 includes a bottom wall 663 facing the primary filter screen 3, a top wall 662 facing the secondary filter screen 4, and an outer sidewall 661 connected between the top wall 662 and the bottom wall 663, the dust suction port 61 is formed between the bottom wall 663 and the corresponding outer sidewall 661, the dust discharge port 62 is formed between the top wall 662 and the corresponding outer sidewall 661, the length of the dust suction port 61 is the same as the length of the secondary filter screen 4 corresponding to the length direction, and the dust suction port 61 reciprocates along with the dust removing channel 6 in the direction perpendicular to the length of the dust suction port 61 under the driving of the power unit 7. The dust suction chamber 64 is provided with a dust suction air guide surface 67, the dust suction air guide surface 67 extends from the dust suction port 61 to the fan air inlet 81 of the dust removal fan 8 in an inclined mode, and a dust suction pressurization cavity 671 with increased pressure from the fan air inlet 81 to the dust suction port 61 is formed between the dust suction air guide surface 67 and the corresponding outer side wall 661. The "dust suction pressurization cavity 671" is a cavity whose cross section is reduced from the fan air inlet 81 to the dust suction opening 61, so that a great negative pressure is formed at the dust suction opening 61, and dust attached to the secondary filter screen 4 can be sucked. Dust exhaust cavity 65 has a dust exhaust air guide surface 68, dust exhaust air guide surface 68 is by dust exhausting fan 8's air outlet 12 orientation dust exhaust port 62 slope extends, form the dust exhaust pressure boost chamber 681 by fan air outlet 82 to the increase of dust exhaust port 62 pressure between dust exhaust air guide surface 68 and the lateral wall 661 that corresponds. The dust removing fan 8 is arranged in the dust exhaust chamber 65, and a fan air inlet 81 of the dust removing fan 8 is opposite to the communicating hole 631. The term "dust discharge plenum 681" means that the cross-section of the dust discharge plenum 681 is narrowed from the fan outlet 82 to the dust discharge port 62, so that a large pressure difference can be formed at the dust discharge port 62, the formation of the pressure difference ensures that dust adsorbed in the dust removal channel 6 can be smoothly discharged, and the increased pressure difference enables the dust discharge port to form a large dust discharge wind force, so that large dust attached to the primary filter screen 3 is blown off while dust is discharged.

Specifically, the dust removal channel 6 is provided with two dust suction ports 61 and two dust suction air guide surfaces 67, the two dust suction ports 61 are respectively located at two ends of the dust removal channel 6 in the width direction, the two dust suction air guide surfaces 67 are intersected and closed, and at this time, the dust suction chamber 64 is formed by a dust removal box body 66, the dust suction air guide surfaces 67 and a partition plate 63 which are jointly surrounded. The dust suction port 61 is formed at the joint of the dust suction air guide surface 67 and the outer side wall 661 and extends along the direction vertical to the reciprocating movement of the dust removing channel 6; the dust exhaust port 62 is formed at the connection position of the dust exhaust and guide surface 68 and the outer side wall 661, and the extending direction of the dust exhaust port 62 is the same as the extending direction of the dust suction port 61. The dust collection air guide surface 67 is formed on the top wall 662, and the dust discharge air guide surface 68 is formed on the bottom wall 663. In this embodiment, two dust suction ports 61 and two dust discharge ports 62 are provided in parallel with each other. Of course, only one dust suction port 61 and one dust exhaust port 62 may be provided; the number of the dust suction ports 61 and the number of the dust discharge ports 62 are not limited to be mutually corresponding, that is, two dust suction ports 61 and one dust discharge port 62 can be arranged; or one dust suction port 61 and two dust discharge ports 62 can be arranged. In the present embodiment, the dust suction port 61 and the dust discharge port 62 are elongated holes, but in practical implementation, the dust suction port 61 or the dust discharge port 62 may be respectively configured as a plurality of dust suction holes arranged along the direction of the reciprocating movement of the vertical dust removal passage 6, and the same is also applicable after the arrangement.

In the present embodiment, corresponding to the dust suction port 61: the dust collection chamber 64 has two dust collection air guide surfaces 67, the dust collection air guide surfaces 67 extend obliquely from the corresponding dust collection ports 61 toward the fan air inlet 81 of the dust removal fan 8, and the length of the dust collection air guide surfaces 67 is the same as the length of the extension of the dust collection ports 61. The bottoms of the two dust collection air guide surfaces 67 are intersected and closed. The dust-collecting air guide surface 67 preferably extends to a fan air inlet 81 near the dust-removing fan 8. The dust suction pressurizing chamber 671 is formed at a position between the dust suction air guide surface 67 and the corresponding outer side wall 661. The section of the dust collection pressurizing cavity 671 from the bottom of the dust collection air guide surface 67 to the top of the dust collection air guide surface 67 is gradually increased, so that a large negative pressure air flow is formed at the dust collection port 61, when the dust collection fan 8 rotates synchronously (or at the same power), a larger adsorption force can be formed at the dust collection port 61, so that impurities such as dust attached to the primary filter screen 3 are sucked into the dust collection channel 6, and the cleaning force is stronger.

Corresponding to the dust discharge port 62: the dust exhaust chamber 65 has two dust exhaust air guide surfaces 68, the dust exhaust air guide surface 68 is faced by the fan air outlet 82 of the dust removing fan 8 the dust exhaust port 62 extends obliquely, and the dust exhaust pressurizing cavity 681 is formed at the position between the dust exhaust air guide surface 68 and the corresponding outer side wall 661. The upper parts of the two dust-removing air guide surfaces 68 are connected and the positions of the two dust-removing air guide surfaces are corresponding to the air outlet 82 of the fan, and the bottom end of each dust-removing air guide surface 68 extends to the position of the corresponding dust-removing port 62. The length of the dust exhaust and guiding surface 68 is the same as the length of the dust exhaust port 62. Similarly, the cross section of the dust exhaust pressurizing cavity 681 is gradually reduced from the top of the dust exhaust air guide surface 68 to the bottom of the dust exhaust air guide surface 68, so as to ensure that a large dust exhaust pressure difference is formed at the dust exhaust port 62, and when the dust removal fan 8 rotates synchronously (or has the same power), a large dust exhaust force can be formed at the dust exhaust port 62, so that the dust removal channel 6 is ensured to be smooth, and the dust exhaust port 62 is not easily blocked. The dust exhaust pressurizing cavity 681 enables the dust exhaust port 62 to form a pressurizing type dust exhaust port, so that sundries on the secondary filter screen 4 can be blown off more easily while the smoothness of the dust exhaust port 62 is guaranteed, and the dust collection and dust exhaust integrated design is convenient and efficient.

After the two dust suction ports 61 are arranged at the two ends of the dust removing channel 6 in the width direction, in the case of the embodiment, the dust suction ports 61 can perform dust suction treatment on the edge position of the secondary filter screen 4 along with the movement of the dust removing channel 6, so that the defect of incomplete dust removal caused by the fact that the dust suction ports are designed on one side in the prior art is overcome. Of course, the dust removing channel 6 may also be provided with only one dust suction port 61, in this case, the dust suction port 61 is located at one end of the width direction of the dust removing channel 6, and the stroke of the dust suction port 61 is greater than or equal to the width of the secondary filter screen 4 in the stroke direction. After the arrangement, although the dust suction port is arranged on one side, the defect of incomplete dust suction in the prior art can also be avoided because the stroke of the dust suction port 61 is larger than the width of the secondary filter screen 4.

Furthermore, the main channel 1 is provided with a dust brush 10 at a position corresponding to the dust collection port 61, a brush head of the dust brush 10 is in contact with the secondary filter screen 4, and a gap is formed between the dust collection port 61 and the secondary filter screen 4. In order not to affect the dust suction effect, the gap is preferably less than 2 cm. The dust sweeping brush 10 is detachably and fixedly arranged on the main channel 1 and sweeps dust of the secondary filter screen 4 along with the movement of the main channel 1, dust and the like attached to the secondary filter screen 4 can be scraped off or loosened substantially, and the dust removal efficiency is improved. The dust brush 10 can be installed on the upper portion of the main channel 1 through fasteners such as screws and bolts, or structures such as a clamping groove can be arranged on the main channel 1, and a brush handle of the dust brush 10 is inserted into the clamping groove in a tight fit mode to complete installation.

As can be seen from the above description of the air filtering mechanism of the present invention, the air filtering mechanism of the fresh air system of the present invention is provided with the dust removing channel 6 which is an integral type and moves back and forth, so that the air filtering mechanism is self-cleaned, the smooth operation of the fresh air system is ensured, and the maintenance frequency and cost are reduced; the dust collection port 61, the dust discharge port 62 and the dust removal channel 6 are integrally designed, so that compared with the existing fresh air system, no additional connecting hose is required, the dust removal fan 8, the dust collection port 61 and the dust discharge port 62 are integrated in a non-connecting mode through the integral dust removal channel 6, no connecting pipeline is required, and the bending damage of the connecting pipeline in the reciprocating movement process is avoided; no connecting dead angle exists, dust is not easy to accumulate in the channel, the channel is not easy to block, the installation is convenient, the structural stability is high, and the service life is longer; the dust removal channel 6 is divided into a dust collection chamber 64 and a dust discharge chamber 65 which are communicated with each other through the partition plate 63, so that the influence on the dust removal effect caused by the vortex phenomenon in the dust removal channel is avoided, in addition, the negative pressure is favorably formed in the dust collection chamber 64, and the dust is convenient to suck and discharge; the dust collection air guide surface 67 and the dust discharge air guide surface 68 are utilized to guide the sucked dust and the discharged dust along the corresponding air guide surfaces in a centralized way, so that the dust collection efficiency is higher, and the phenomenon of dust accumulation at the corners inside the channel is avoided; the inside of the channel forms a dust suction pressurizing cavity 671 and a dust discharge pressurizing cavity 681, and under the condition of the same efficiency of the dust removal fan 8, larger dust suction force and dust discharge force can be formed at the dust suction port 61 and the dust discharge port 62, so that the dust removal efficiency is high.

It should be noted that, in this embodiment, the first-stage filter screen 3 and the second-stage filter screen 4 are horizontally arranged, for example, and in specific implementation, the first-stage filter screen 3 and the second-stage filter screen 4 may be vertically arranged according to factors such as installation space and use environment, and the dust removal channel 6 is correspondingly horizontally arranged, so that the dust collection opening 61 is opposite to the second-stage filter screen 4.

The utility model provides a new trend system, as shown in figure 1, for the utility model discloses a new trend system's preferred embodiment, it is right to combine the drawing down the utility model discloses detailed description is done to new trend system's preferred embodiment:

the new trend system includes new trend cavity 13, new trend fan 14 to and as above the filtration mechanism, new trend cavity 13 passes through air outlet 12 and main channel 1 intercommunication, new trend fan 14 will introduce in new trend cavity 13 through the filterable new trend gas of filtration mechanism. The fresh air fan 14 is arranged in the fresh air chamber 13 in this embodiment, and when the fresh air fan 14 is specifically implemented, the fresh air fan 14 may be installed at a joint of the fresh air chamber 13 and the main channel 1, or the fresh air fan 14 is installed in the main channel 1, that is, the installation position and the installation form of the fresh air fan 14 are not limited, as long as the fresh air can be introduced into the fresh air chamber 13.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides an air filtering mechanism, is including being formed with the main entrance of filtration cavity, the main entrance has air intake and air outlet, the main entrance is installed the great one-level filter screen of mesh, the less second grade filter screen of mesh by air intake to air outlet spaced, form first cavity, its characterized in that between one-level filter screen, the second grade filter screen: the air filtering mechanism further comprises a dust removing channel, a power unit and a dust removing fan, the dust removing channel is arranged in the first cavity, the dust removing fan is located in the dust removing channel, the power unit is installed on the main channel and can drive the dust removing channel to move back and forth, the dust removing channel is provided with a dust suction port for sucking dust to the secondary filter screen and a dust exhaust port for blowing dust to the primary filter screen, a partition plate is arranged in the dust removing channel and separates the dust removing channel into a dust suction cavity communicated with the dust suction port and a dust exhaust cavity communicated with the dust exhaust port, the partition plate is provided with a communication hole for communicating the dust suction cavity with the dust exhaust cavity, the dust removing fan is provided with a fan inlet and a fan outlet, the fan inlet of the dust removing fan is directly communicated with the dust suction cavity, and the fan outlet of the dust removing fan is directly.

2. An air filtration mechanism according to claim 1 wherein: the dust removal channel comprises a dust removal box body, the dust removal box body is provided with an outer side wall, the dust collection cavity is provided with a dust collection air guide surface, the dust collection air guide surface extends in an inclined mode from a dust collection port to a fan inlet of the dust removal fan, and a dust collection pressurizing cavity with the pressure increased from the fan inlet to the dust collection port is formed between the dust collection air guide surface and the corresponding outer side wall.

3. An air filter arrangement according to claim 1 or 2, wherein: the dust removal passageway is including the dust removal box, the dust removal box has an lateral wall, the dust exhaust cavity has a dust exhaust air guide surface, the dust exhaust air guide surface is by dust exhausting fan's air outlet orientation the slope of dust exhaust mouth extends, form the dust exhaust pressure boost chamber by fan air outlet to the increase of dust exhaust mouth pressure between dust exhaust air guide surface and the lateral wall that corresponds.

4. An air filtration mechanism according to claim 1 wherein: the dust removal fan is arranged in the dust exhaust chamber, and a fan air inlet of the dust removal fan is opposite to the communicating hole.

5. An air filtration mechanism according to claim 2 wherein: the dust removal box includes the roof that faces the one-level filter screen, the diapire that faces the second grade filter screen and connects the lateral wall between roof and diapire, the dust absorption mouth forms between diapire and corresponding lateral wall, the dust exhaust mouth form between roof and the lateral wall that corresponds, the length of dust absorption mouth with the length of side of this length direction of correspondence of filter screen is the same, the dust absorption mouth is followed dust removal channel is at the direction reciprocating motion of perpendicular dust absorption mouth length.

6. An air filtration mechanism according to claim 1 wherein: the dust removal channel is provided with two dust collection ports and two dust collection air guide surfaces, the two dust collection ports are respectively located at two ends of the width direction of the dust removal channel, the two dust collection air guide surfaces are intersected and closed, and the dust collection cavity is formed by a dust removal box body, the dust collection air guide surfaces and a partition plate in a surrounding mode.

7. An air filtration mechanism according to claim 1 wherein: the dust removal channel is only provided with one dust collection port, the dust collection port is positioned at one end of the dust removal channel in the width direction, and the stroke of the dust collection port is larger than or equal to the width of the secondary filter screen in the stroke direction.

8. An air filtration mechanism according to any one of claims 1 or 2 to 7 wherein: and a guide mechanism is arranged on the outer side of the dust removal channel, and a guide rail for guiding the guide mechanism to move is arranged on the main channel along the reciprocating movement direction of the dust removal channel.

9. An air filtration mechanism according to any one of claims 1 or 2 to 7 wherein: the main channel is provided with a dust sweeping brush at a position corresponding to the dust collection port, a brush head of the dust sweeping brush is in contact with the secondary filter screen, and a gap is formed between the dust collection port and the secondary filter screen.

10. A new trend system which characterized in that: the fresh air device comprises an air filtering mechanism as claimed in any one of claims 1 to 9, a fresh air chamber and a fresh air fan, wherein the fresh air chamber is communicated with an air outlet, and fresh air filtered by the air filtering mechanism is introduced into the fresh air chamber by the fresh air fan.

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