CN111569551B - Self-cleaning air inlet filtering mechanism without stopping filtering for cable tunnel and decontamination method thereof - Google Patents

Abstract

The invention discloses a self-cleaning non-stop filtering air inlet filtering mechanism for a cable tunnel, wherein a square box body is connected in series on an air inlet channel through a flange mounting structure, an upper filter screen roller and an upper air blocking roller are arranged in the square box body above the air inlet channel, and a lower filter screen roller and a lower air blocking roller are arranged in the square box body below the air inlet channel; a filter screen is wound between the upper filter screen roller and the lower filter screen roller; the upper filter screen roller is in compressed fit with the upper air blocking roller, and the lower filter screen roller is in compressed fit with the lower air blocking roller; one end of the central shaft of the upper filter screen roller or the lower filter screen roller extends out of the square box body and is in transmission connection with a shaft of a forward and reverse rotating motor through a coupler; a filter screen decontamination device used for passively cleaning the filter screen in the rotation of the filter screen is arranged in the square box body along the left and right directions. The invention can provide clean air supply for the cable tunnel, can clean the filter screen without stopping air inlet for a long time under unattended operation, keeps the filter screen clean for a long time, and does not reduce the filtering performance of the filter screen under unattended operation.

Description

Self-cleaning and non-stop filtering air inlet filter mechanism for cable tunnel and its decontamination method

technical field

The present invention relates to cable tunnel safety technology.

Background technique

The application of electric energy has penetrated into every corner of modern society, from every family to every factory, from industrial production to agricultural production to modern service industry, all aspects are inseparable from the support of electricity.

A cable tunnel refers to a tunnel for laying cables. There are many advantages of cable tunnels, the most obvious of which is that it is a one-time investment and construction. There are many cable supports in the tunnel. After the tunnel is completed, it only needs to be checked on time, and there is no need to propose new cable plans to the relevant departments.

There are many cables in a cable tunnel. Once a problem occurs in the cable tunnel, the impact will be very large, resulting in unpredictable economic losses. Therefore, it is necessary to ensure that the cable tunnel is always in a safe state. The main safety issue in cable tunnels is fire; the cause of fire in cable tunnels is the cable on fire. In order to prevent the cables from catching fire, it is necessary for the staff to patrol the cable tunnels from time to time, check the heating conditions of the cables everywhere, and check and deal with the cables in time when they are found to be overheated, which brings a relatively large maintenance workload to the cable tunnels. When the overload increases and the heat generation increases, the staff cannot guarantee that they are just patrolling and finding the problem.

In addition to cables, some electrical components are also placed in the cable tunnel. If there is a lot of dust in the cable tunnel, there is a risk of increased temperatures and even short circuits. Most of the cable tunnels are unattended. If a ventilation system can be designed that can ensure the air cleanliness in the cable tunnel as much as possible when unattended for a long time, the safety of the cable tunnel will be improved. The filter screen needs to be cleaned after a period of use. The existing filter mechanism needs to interrupt the filtering process when cleaning the filter screen. After cleaning the filter screen, the filter screen can be put into use again. The filter mechanism cannot operate automatically for a long time.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an air inlet filter mechanism for a cable tunnel ventilation system, which has good filtering effect, can automatically clean the filter screen and does not need to stop the filtering process when cleaning the filter screen, which is in line with the current situation that the cable tunnel does not need daily personnel on duty. Require.

In order to achieve the above purpose, the present invention provides a self-cleaning and non-stop filtering air inlet filter mechanism for cable tunnels, which is used for the air inlet air duct of the cable tunnel, and a square box body is installed in series on the air inlet air duct through a flange mounting structure. , the square box is connected with the air inlet duct;

The upper filter screen drum and the upper air blocking drum are arranged in the square box above the air inlet duct, and the lower filter screen drum and the lower air blocking drum are arranged in the square box below the air inlet duct; The air blocking drum, the lower filter screen drum and the lower air blocking drum are located on the same plane perpendicular to the air inlet duct;

Take the air inlet direction in the air inlet duct as the forward direction, and the horizontal direction perpendicular to the air inlet direction is the left and right direction;

A filter screen is arranged between the upper filter screen drum and the lower filter screen drum, the filter screen extends beyond the air inlet duct in the up, down, left and right directions, and the filter screen is adjacent to the inner wall of the square box in the left and right directions;

The central axis of the upper filter drum, the upper air blocking drum, the lower filter drum and the lower air blocking drum are installed on the left and right side walls of the square box; The drum and the lower air blocking drum are tightly fitted; there is a gap between the upper filter drum and the top wall of the square box, and the gap is less than or equal to 3 mm; there is a gap between the lower filter drum and the bottom wall of the square box, and the gap is less than or equal to 3 mm. The gap is less than or equal to 3 mm;

One end of the central axis of the upper filter drum or one end of the central axis of the lower filter drum protrudes from the square box and is connected with the shaft of a forward and reverse motor through a coupling;

The air inlet duct extends into the square box along the front and rear directions, the air inlet duct on the rear side of the square box extends forward to be adjacent to the filter screen, and the air inlet duct on the front side of the square box extends backward to be adjacent to the filter screen. adjacent;

The square box is provided with a filter decontamination device along the left and right directions for passively cleaning the filter during the rotation of the filter. The filter decontamination device is located below the air inlet duct and above the lower filter drum;

The bottom wall of the square box body on the front and rear sides of the filter screen decontamination device is symmetrically provided with a pollution discharge structure; The lowest part of the sewage trough is connected with a sewage pipe, and the sewage pipe is provided with a sewage valve; the side wall of the box at the sewage trough is provided with a vertically arranged transparent observation window.

The flange mounting structure includes a radially protruding air duct flange on the air inlet air duct and a box body flange arranged radially protruding on both sides of the square box body. The air duct flange is arranged along the air inlet air duct. There are two intervals in the length direction;

The box flange and the air duct flange are in one-to-one correspondence. There is a rubber gasket between the box flange and the air duct flange. The box flange and the air duct flange pass through the box flange. The plate, the rubber pad and the air duct flange are fixedly connected with the fastening bolts, and the fastening bolts are evenly arranged along the circumference of the box flange and the air duct flange.

The upper screen drum and the lower screen drum are radially recessed with installation grooves for winding the filter screen, and the filter screen is wound between the installation groove of the upper screen drum and the installation groove of the lower screen drum.

The filter screen decontamination device includes a partition plate located just above the axis of the lower filter screen drum, the partition plate extends along the left-right direction and is fixedly connected with the left and right side walls of the square box; the partition plate is fixedly connected upward with a a horizontally arranged upper limit plate, the partition plate is fixedly connected downward with a horizontally arranged lower limit plate, the upper limit plate and the lower limit plate extend along the left and right directions and are fixedly connected with the left side wall and the right side wall of the square box;

The filter screen on the rear side of the upper filter screen drum and the lower filter screen drum forms the second half of the filter screen, and the filter screen on the front side of the upper filter screen drum and the lower filter screen drum forms the first half of the filter screen;

A rear top pressing block is arranged behind the rear half of the filter screen, and a rear sliding block is arranged in front of the rear half of the filter screen. The rear top pressing block extends along the left and right directions and is fixedly connected with the left and right side walls of the square box;

The front end of the rear slider is located between the upper limit plate and the lower limit plate and is slidingly matched with the upper limit plate and the lower limit plate. A rear spring is pressed between the rear slider and the partition plate, and the rear spring pushes the rear slider backward to press the rear half of the filter screen on the rear top pressure block; the front side of the rear top pressure block and the rear of the rear slider The sides are all wear-resistant rubber surfaces; the upper surface of the rear top pressure block and the upper surface of the rear slider are located in the same inclined plane with front high and rear low;

A front top pressure block is arranged in front of the front half of the filter screen, and a front slider is arranged behind the front half of the filter screen. The front top pressure block extends along the left and right directions and is fixedly connected with the left and right side walls of the square box;

The rear end of the front slider is located between the upper limit plate and the lower limit plate and is slidingly matched with the upper limit plate and the lower limit plate. ; A front spring is pressed between the front slider and the partition, and the front spring pushes the front slider forward to press the front half of the filter screen on the front top pressure block; the rear side of the front top pressure block and the front slider The front sides are all wear-resistant rubber surfaces; the upper surface of the front top pressure block and the upper surface of the front slider are located in the same inclined plane with rear high and front low;

The rotation direction of the filter screen during normal operation is that the second half of the filter screen runs from top to bottom, and the upper surface of the rear top pressing block and the upper surface of the front top pressing block are both smooth surfaces.

The square box body at the upper filter screen drum and the upper air blocking drum is respectively horizontally protruded with upper grooves along the left and right directions, and the upper groove is a part of the square box body;

The upper filter drum and the upper air blocking drum both extend into the upper groove along the left and right directions; the distance between the upper filter drum and the lower side wall of the upper groove is less than or equal to 3 mm, and the center of the upper filter drum and the upper air blocking drum The shafts are installed on the groove bottom of the upper groove through bearings, and the distance between the upper filter drum and the upper air blocking drum from the groove bottom of the upper groove on the left and right sides is less than or equal to 3 mm;

The square box body at the lower filter screen drum and the lower air blocking drum is respectively horizontally protruded with lower grooves along the left and right directions, and the lower groove is a part of the square box body;

The lower filter drum and the lower air blocking drum both extend into the lower groove along the left and right directions; the distance between the lower filter drum and the upper side wall of the lower groove is less than or equal to 3 mm, and the center of the lower filter drum and the lower air blocking drum The shafts are installed on the groove bottom of the lower groove through bearings, and the distance between the lower filter drum and the lower air blocking drum from the groove bottom of the lower groove on the left and right sides is less than or equal to 3 mm.

During normal operation, the filter screen rotates forward, and the rotation direction of the filter screen is the second half of the filter screen running from top to bottom; when there is inseparable dirt attached to the filter screen during the forward rotation of the filter screen, control the positive and negative The rotating motor drives the filter screen to rotate forward and reverse alternately, so that the filter screen passes through the filter screen decontamination device alternately in forward and reverse directions.

The present invention has the following advantages:

By using the invention, clean air supply can be provided for the cable tunnel, and the filter screen can be cleaned without stopping the air intake while being unattended for a long time, the filter screen can be kept clean for a long time, and the filtering performance of the filter screen will not be reduced without being on duty. .

The filter screen facing the air inlet duct is where the air volume is most concentrated. The filter screen extends beyond the air inlet duct in the up, down, left, and right directions, so that the filter screen can effectively filter the incoming air. The filter screen is adjacent to the inner wall of the square box in the left and right directions, so that the left and right sides of the filter screen are not easy to leak air. The gap between the left and right sides of the filter screen and the inner wall of the box is not directly facing the air inlet pipe, and the second gap is small, which prevents most of the dirt from flowing forward through the gap.

The upper air blocking drum is crimped with the upper filter screen drum, which eliminates the gap between the upper air blocking drum and the upper filter screen drum, so that the dirt will not leak out here. The upper air blocking drum makes the gap between the drum and the top wall of the square box farther away from the filter screen, reducing the possibility of dirt leaking out of the gap. Through the transparent observation window, the staff can observe the contamination situation, so as to open the sewage valve in time to discharge the sewage.

The setting of the installation groove can prevent the left and right positions of the filter screen from shifting during operation, and prevent the filter screen from scraping the side wall of the square box during rotation.

The filter screen decontamination device has a simple structure, is arranged above the lower filter screen drum and forms a passive decontamination structure.

When the filter screen rotates, the front half of the filter screen moves downward and passes through the mating surface of the rear top pressure block and the rear slider. Squeeze force, so as to fall on the upper surface of the rear top pressure block. Under the action of gravity, the dirt slides down along the upper surface of the smooth rear top pressure block to the sewage tank. The staff only needs to maintain it regularly, that is, open the sewage valve periodically (such as a month) to discharge accumulated dirt. The upper surface of the front top pressure block is also a smooth surface, which is to reverse the filter screen to remove the dirt that is difficult to remove when the filter screen is rotated forward. When the filter is reversed, the force of the dirt at the filter decontamination device is opposite to that of the forward rotation. Therefore, by making the filter rotate forward and reverse alternately, most of the dirt that cannot be removed during forward rotation can be removed. thing.

When the front half of the filter screen moves upward and passes through the mating surface of the front top pressure block and the front slider, the dirt on the filter screen (if any) is pressed down by the tightly fitted front top pressure block and the front slider. pressure and thus fall into the sump. Since most of the dirt is cleaned at the rear half of the filter screen, the amount of dirt cleaned at the front top pressure block and front slider is very small.

If the second half of the filter screen runs from bottom to top, the dirt will rotate with the filter screen for nearly a week before it encounters the filter screen decontamination device. Lots of time and space. In the present invention, the second half of the filter screen runs from top to bottom, and the dirt will inevitably encounter the filter screen decontamination device in less than half a circle of rotation with the filter screen. Contaminants are more easily removed in a concentrated manner rather than diffused, making the decontamination process more efficient.

The air inlet duct is adjacent to the filter screen, so that most of the air volume passes through the filter screen in the area within the vertical section of the air inlet air duct, and only a small amount of air volume escapes into the square box outside the air inlet air duct.

In the present invention, the gaps everywhere are less than 3 mm, even if a small part of the air volume passes through the gaps, in fact, the gaps also play a certain role in filtering the incoming air. In the gaps, the gaps between the upper and lower air-blocking rollers and the top and bottom walls of the square box are dynamic gaps. static clearance. Even if each static gap is blocked by dirt, it will not affect the air passing through the filter screen from the area within the cross section of the air inlet duct. Dynamic clearance is because the drum is constantly rotating, so it will not be blocked by dirt.

In the present invention, most of the air volume can only pass through the filter screen in the area within the vertical section of the air inlet air duct, and only a small amount of air volume escapes into the square box outside the air inlet air duct. Due to the small amount of air leakage at the gap around the filter screen, it is difficult for the dirt to pass through the edge gap away from the air inlet duct. Therefore, most of the air that escapes into the square box passes through the air outside the vertical section of the air inlet duct. The filter screen is also filtered, thus ensuring the filtering effect.

In the present invention, the filter screen can be actively rotated. During the rotation process of the filter screen, the filter screen decontamination device automatically removes the dirt on the filter screen, thereby realizing automatic cleaning of the filter screen and without stopping the filtering process when cleaning the filter screen. At the same time, the filter screen is continuously cleaned to maintain the cleanliness of the filter screen. There is no need to arrange a special time to suspend the filtering process to clean the filter screen. status quo requirements.

The upper groove and the lower groove are arranged so that the gap between the inner wall of the square box at the upper filter screen drum, the upper air blocking drum, the lower filter screen drum and the lower air blocking drum and each drum is opposite to the filter screen and the square box body. The gap between them is bent, increasing the flow resistance of the airflow reaching the gap between each roller and the inner wall of the square box (the groove bottom of the upper groove and the lower groove), thereby reducing the probability of dust and other dirt passing through. In addition, the distances between each roller and the groove bottoms of the upper groove and the lower groove are relatively small, so that it is difficult for dirt to pass through the gap.

By changing the forward and reverse rotation of the filter screen, the force direction and specific force point of the dirt at the filter screen decontamination device are changed (for example, the force point of the second half of the filter screen is located at the upper end of the rear top pressure block during forward rotation. When reversing, the stress point of the rear half of the filter screen is located at the lower end of the rear top pressure block) for more thorough decontamination.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the self-cleaning non-stop filtering air inlet filter mechanism of the cable tunnel of the present invention;

Fig. 2 is the structural representation of the self-cleaning non-stop filtration air inlet filter mechanism of the cable tunnel of the present invention, and the side walls of the lower filter screen drum and the square filter screen below it are all transparent observation windows in Fig. 2;

FIG. 3 is a view taken along the line AA of FIG. 1;

Figure 4 is a schematic structural diagram of the upper filter drum; the structure of the lower filter drum is the same as that of the upper filter drum;

FIG. 5 is an enlarged view of the filter screen decontamination device in FIG. 1 .

Detailed ways

As shown in FIG. 1 to FIG. 5 , the present invention provides a cable tunnel air inlet filter mechanism, which is used for the air inlet air duct 20 of the cable tunnel. The air inlet air duct 20 is connected in series with a square box through a flange mounting structure. 26, the square box 26 is communicated with the air inlet duct 20;

The upper filter screen drum 27 and the upper air blocking drum 28 are arranged in the square box above the air inlet duct 20, and the lower filter screen drum 29 and the lower air blocking drum 30 are arranged in the square box below the air inlet duct 20; The upper filter screen drum 27, the upper air blocking drum 28, the lower filter screen drum 29 and the lower air blocking drum 30 are located on the same plane perpendicular to the air inlet duct 20;

Taking the air inlet direction in the air inlet duct 20 as the forward direction, and the horizontal direction perpendicular to the air inlet direction as the left and right direction;

A filter screen 31 is arranged between the upper filter screen drum 27 and the lower filter screen drum 29. The filter screen 31 extends beyond the air inlet duct 20 in the up, down, left, and right directions. The inner walls of 26 are adjacent;

The central axes of the upper filter drum 27, the upper air blocking drum 28, the lower filter drum 29 and the lower air blocking drum 30 are installed on the left and right side walls of the square box 26; the upper filter drum 27 and the upper air blocking drum 28 Press fit, the lower filter drum 29 and the lower air blocking drum 30 are tightly fit; there is a gap between the upper filter drum 27 and the top wall of the square box 26 and the gap is less than or equal to 3 mm; the lower filter drum 29 and There is a gap between the bottom walls of the square box body 26 and the gap is less than or equal to 3 mm;

One end of the central axis of the upper filter drum 27 or one end of the central axis of the lower filter drum 29 protrudes from the square box 26 and is connected to the shaft of a forward and reverse rotation motor 32 through a coupling; the central axis of each drum, The central shaft including the protruding square box body 26 is connected with the side wall of the square box body 26 through bearings. The bearings and the coupling are conventional components, not shown in the figure.

The air inlet duct 20 extends into the square box body 26 along the front and rear directions, the air inlet air duct 20 on the rear side of the square box body 26 extends forward to be adjacent to the filter screen 31, and the air inlet air duct 20 on the front side of the square box body 26 extends forward. Extend backward to be adjacent to the filter screen 31; the gap between the air inlet duct 20 and the filter screen 31 is less than or equal to 3 mm. The air inlet duct 20 is adjacent to the filter screen 31, so that most of the air volume passes through the filter screen 31 in the area within the vertical section of the air inlet air duct, and only a small amount of air volume escapes into the square box 26 outside the air inlet air duct. .

The square box body 26 is provided with a filter screen decontamination device 33 for passively cleaning the filter screen 31 during the rotation of the filter screen 31 along the left and right directions. 29 or more;

The bottom walls of the square box body 26 on the front and rear sides of the filter screen decontamination device 33 are symmetrically provided with a pollution discharge structure; The cross section is arc-shaped, and the lowest part of the sewage tank 34 is connected with a sewage pipe 35 downward, and the sewage pipe 35 is provided with a sewage valve 36; The transparent observation window is a conventional structure, not shown in the figure.

The filter screen 31 facing the air inlet duct 20 is where the air volume is most concentrated. The filter screen 31 extends beyond the air inlet duct 20 in the up, down, left, and right directions, so that the filter screen 31 can effectively filter the incoming air. The filter screen 31 is adjacent to the inner wall of the square box 26 in the left and right directions, so that the left and right sides of the filter screen 31 are not easy to leak air. The gap between the left and right sides of the filter screen 31 and the inner wall of the box is not directly facing the air inlet pipe, and the second gap is small, which prevents most of the dirt from flowing forward through the gap.

The upper air blocking drum 28 and the upper filter screen drum 27 are in pressure contact, which eliminates the gap between the upper air blocking drum 28 and the upper filter screen drum 27, so that the dirt will not leak out here. The upper air blocking drum 28 makes the gap between the drum and the top wall of the square box 26 farther away from the filter screen 31 , reducing the possibility of dirt leaking out of the gap.

Through the transparent observation window, the staff can observe the contamination situation, so as to open the sewage valve 36 in time to discharge the sewage.

The flange mounting structure includes an air duct flange 37 radially protruding on the air inlet duct 20 and a box flange 38 radially protruding on both sides of the square box body. The air duct flange 37 Two are arranged at intervals along the length direction of the air inlet duct 20;

The box flange 38 corresponds to the air duct flange 37 one by one, and a rubber pad 39 is arranged between the box flange 38 and the air duct flange 37. The box flange 38 and the air duct flange 37 Fastening bolts 40 passing through the box flange 38 , the rubber pad 39 and the air duct flange 37 are fixedly connected. multiple.

The upper filter drum 27 and the lower filter drum 29 are radially recessed with installation grooves 41 for winding the filter screen 31, and the filter screen 31 is wound around the installation groove 41 of the upper filter drum 27 and the lower filter screen. Between the installation grooves 41 of the drum 29 .

The setting of the installation groove 41 can prevent the left and right positions of the filter screen 31 from shifting during operation, and prevent the filter screen 31 from scraping the side wall of the square box 26 during rotation.

The filter screen decontamination device 33 includes a partition plate 42 located just above the axis of the lower filter screen drum 29. The partition plate 42 extends in the left-right direction and is fixedly connected with the left and right side walls of the square box body 26; The plate 42 is fixedly connected to the upper limit plate 43 arranged horizontally upward, and the partition plate 42 is fixedly connected to the lower limit plate 44 arranged horizontally downward. The left side wall and the right side wall are fixedly connected;

The upper screen drum 27 and the screen 31 on the rear side of the lower screen drum 29 form the second half 45 of the screen 31, and the screen 31 on the front side of the upper screen drum 27 and the lower screen drum 29 form the first half of the screen 31 46;

There is a rear top pressing block 47 behind the rear half of the filter screen 45, and a rear sliding block 48 in front of the rear half of the filter screen 45. Side wall fixed connection;

The front end of the rear slider 48 is located between the upper limit plate 43 and the lower limit plate 44 and is slidably matched with the upper limit plate 43 and the lower limit plate 44 . It is slidably matched with the right side wall; a rear spring 49 is pressed between the rear slider 48 and the rear side wall of the partition plate 42, and the rear spring 49 pushes the rear slider 48 to press the rear half 45 of the filter screen 31 to the rear. On the top pressure block 47; the front side of the rear top pressure block 47 and the rear side of the rear slider 48 are wear-resistant rubber surfaces; the upper surface of the rear top pressure block 47 and the upper surface of the rear slider 48 are located at the same front and rear in a low inclined plane;

A front top pressing block 50 is arranged in front of the front half 46 of the filter screen, and a front sliding block 51 is arranged behind the front half 46 of the filter screen. Side wall fixed connection;

The rear end of the front slider 51 is located between the upper limit plate 43 and the lower limit plate 44 and is slidingly matched with the upper limit plate 43 and the lower limit plate 44 . A front spring 52 is pressed between the front slider 51 and the front side wall of the partition 42, and the front spring 52 pushes the front slider 51 forward to press the front half 46 of the filter screen 31 on the front side. on the front top pressure block 50; the rear side of the front top pressure block 50 and the front side of the front slider 51 are both wear-resistant rubber surfaces; the upper surface of the front top pressure block 50 and the upper surface of the front slider 51 are located at the same rear height in the front low inclined plane;

The rotation direction of the filter screen 31 during normal operation is that the rear half width 45 of the filter screen 31 runs from top to bottom, and the upper surface of the rear pressing block 47 and the upper surface of the front pressing block 50 are both smooth surfaces.

The mating surfaces of the rear top pressing block 47 and the rear sliding block 48 are located on the same vertical plane as the rear half width 45 of the filter screen 31 , and the mating surfaces of the front top pressing block 50 and the front slider 51 are located on the same vertical plane as the front half width 46 of the filter screen 31 . vertical plane.

The filter screen decontamination device 33 has a simple structure and is arranged above the lower screen drum 29 to form a passive decontamination structure. The upper surface of the front top pressing block 50 is also a smooth surface, in order to reverse the filter screen 31 to remove the dirt that is difficult to remove when the filter screen 31 is rotated forward. When the filter screen 31 is reversed, the force of the dirt on the filter screen decontamination device 33 is opposite to that of the forward rotation. Therefore, by making the filter screen 31 rotate forward and reverse alternately, most of the removal can be removed during forward rotation. Impossible dirt.

If the second half width 45 of the filter screen 31 runs from bottom to top, the dirt will rotate with the filter screen 31 for nearly one turn before it encounters the filter screen decontamination device 33. Dirt diffusion provides more time and space. In the present invention, the second half width 45 of the filter screen 31 runs from top to bottom, and the dirt will inevitably encounter the filter screen decontamination device 33 within less than half of the rotation with the filter screen 31 for the longest time, and the dirt does not rise upwards but flows toward Falling down, dirt is more likely to be removed in a concentrated manner rather than spread out, making the decontamination process more efficient.

In the present invention, most of the air volume can only pass through the filter screen 31 in the area within the vertical section of the air inlet air duct, and only a small amount of air volume escapes into the square box 26 outside the air inlet air duct. Due to the small amount of air leakage at the peripheral gap of the filter screen, it is difficult for the dirt to pass through the edge gap away from the air inlet duct 20. Therefore, most of the air that escapes into the square box 26 passes vertically through the air inlet duct 20. The filter screen 31 outside the cross section is also filtered, thus ensuring the filtering effect.

In the present invention, the filter screen 31 can be actively rotated. During the rotation process of the filter screen 31, the filter screen decontamination device 33 automatically removes the dirt on the filter screen 31, so as to realize automatic cleaning of the filter screen 31 and no need to clean the filter screen 31. The filtering process is stopped, the filter screen 31 is continuously cleaned while filtering, and the cleanliness of the filter screen 31 is maintained. There is no need to arrange a special time to suspend the filtering process to clean the filter screen 31, and the cleaning of the filter screen 31 does not require manual intervention. The work efficiency meets the requirements of the current situation that the cable tunnel does not require personnel to be on duty daily. By using the invention, clean air supply can be provided for the cable tunnel, and the filter screen can be cleaned without stopping the air intake while being unattended for a long time, the filter screen can be kept clean for a long time, and the filtering performance of the filter screen will not be reduced without being on duty. .

The square box body 26 at the upper filter screen drum 27 and the upper air blocking drum 28 is respectively horizontally protruded with upper grooves 53 along the left and right directions, and the upper groove 53 is a part of the square box body 26;

The upper screen drum 27 and the upper air blocking drum 28 both extend into the upper groove 53 along the left and right directions; the distance between the upper screen drum 27 and the lower side wall of the upper groove 53 is less than or equal to 3 mm, and the The central axis of the upper air blocking drum 28 is installed on the groove bottom of the upper groove 53 through the bearing, and the distance between the upper filter screen drum 27 and the upper air blocking drum 28 from the groove bottom of the upper groove 53 on the left and right sides is the same. less than or equal to 3 mm;

The square box body 26 at the lower screen drum 29 and the lower air blocking drum 30 is respectively horizontally protruded with a lower groove 54 along the left and right directions, and the lower groove 54 is a part of the square box body 26;

The lower screen drum 29 and the lower air blocking drum 30 both extend into the lower groove 54 along the left-right direction; the distance between the lower screen drum 29 and the upper side wall of the lower groove 54 is less than or equal to 3 mm, and the lower screen drum 29 and The central axis of the lower air blocking drum 30 is installed on the groove bottom of the lower groove 54 through bearings, and the distance between the lower screen drum 29 and the lower air blocking drum 30 from the groove bottom of the lower groove 54 on the left and right sides is less than is equal to 3 mm.

The setting of the upper groove 53 and the lower groove 54 makes the gap between the inner wall of the square box 26 at the upper filter drum 27, the upper air blocking drum 28, the lower filter drum 29 and the lower air blocking drum 30 and each drum The gap between the relative filter screen 31 and the square box body 26 is bent to increase the flow resistance of the airflow reaching the gap between each drum and the inner wall of the square box body 26 (the groove bottom of the upper groove 53 and the lower groove 54). , thereby reducing the probability of dust and other contaminants passing through. In addition, the distances between each roller and the groove bottoms of the upper groove 53 and the lower groove 54 are relatively small, so that it is difficult for dirt to pass through the gap.

During normal operation, the filter screen 31 is rotated forward, and the rotation direction of the filter screen 31 is that the second half of the filter screen 31 45 runs from top to bottom; When there is dirt, the forward and reverse rotation motor 32 is controlled to drive the filter screen 31 to rotate forward and reverse alternately, so that the filter screen 31 passes through the filter screen decontamination device 33 alternately in forward and reverse directions.

By changing the forward and reverse rotation of the filter screen 31, the force direction and specific force point of the dirt at the filter screen decontamination device 33 are changed (for example, the force point of the rear half 45 of the filter screen 31 is located at the rear top pressure during forward rotation. The upper end of the block 47, the stress point of the rear half width 45 of the filter screen 31 is located at the lower end of the rear pressing block 47 when it is reversed) for more thorough decontamination.

The air inlet filter mechanism of the cable tunnel is installed on the air inlet duct 20 of the cable tunnel when in use. During the air intake process of the cable tunnel, the filter screen 31 can be rotated slowly or intermittently, and the rotation interval is preferably 5-10 minutes. A lot of dirt accumulates on it. The filter screen 31 is driven by the forward and reverse rotation motor 32 . During the rotation of the upper filter drum 27 and the lower filter drum 29, the upper air blocking drum 28 and the lower air blocking drum 30 are rotated passively under the action of tight pressure. In this state, the distance between the filter screen and the gap between the upper and lower ends of the drum and the upper and lower ends of the square box is extended, and the resistance of the wind reaching the gap between the upper and lower ends is increased, so that more air flows through the filter screen from the air inlet duct.

When the filter screen 31 is rotated, the second half width 45 of the filter screen 31 runs from top to bottom, and the first half width 46 of the filter screen 31 runs from bottom to top. When the filter screen 31 passes through the mating surface of the rear top pressure block 47 and the rear slider 48, most of the dirt on the filter screen 31 is subjected to the upward pressing force of the tightly fitted rear top pressure block 47 and the rear slider 48. , thereby falling on the upper surface of the rear pressing block 47 . Under the action of gravity, the dirt slides down along the upper surface of the smooth rear top pressure block 47 to the dirt sink 34, and the staff only needs to maintain it regularly, that is, open the sewage valve periodically (for example, a month). 36. Drain the accumulated dirt. When the front half width 46 of the filter screen 31 moves upward and passes through the mating surface of the front top pressing block 50 and the front sliding block 51, the dirt (if any) on the filter screen 31 is subjected to the press-fit front top pressing block 50 and the front sliding block 51. The downward pressing force of the front sliding block 51 falls into the dirt sump 34 . Since most of the dirt is cleaned at the rear half width 45 of the filter screen 31, the amount of dirt cleaned at the front top pressing block 50 and the front slider 51 is very small.

The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced without departing from the Any modification or partial replacement of the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims (6)

1. The self-cleaning and non-stop filtering air inlet filter mechanism of the cable tunnel is used for the air inlet air duct, and it is characterized in that: A square box for preventing air leakage and dust leakage is installed in series on the air inlet duct through the flange installation structure, and the square box is connected with the air inlet duct; The upper filter screen drum and the upper air blocking drum are arranged in the square box above the air inlet duct, and the lower filter screen drum and the lower air blocking drum are arranged in the square box below the air inlet duct; The air blocking drum, the lower filter screen drum and the lower air blocking drum are located on the same plane perpendicular to the air inlet duct; Take the air inlet direction in the air inlet duct as the forward direction, and the horizontal direction perpendicular to the air inlet direction is the left and right direction; A filter screen is arranged between the upper filter screen drum and the lower filter screen drum, the filter screen extends beyond the air inlet duct in the up, down, left and right directions, and the filter screen is adjacent to the inner wall of the square box in the left and right directions; The central axis of the upper filter drum, the upper air blocking drum, the lower filter drum and the lower air blocking drum are installed on the left and right side walls of the square box; The drum and the lower air blocking drum are tightly fitted; there is a gap between the upper filter drum and the top wall of the square box, and the gap is less than or equal to 3 mm; there is a gap between the lower filter drum and the bottom wall of the square box, and the gap is less than or equal to 3 mm. The gap is less than or equal to 3 mm; One end of the central axis of the upper filter drum or one end of the central axis of the lower filter drum protrudes from the square box and is connected with the shaft of a forward and reverse motor through a coupling; The air inlet duct extends into the square box along the front and rear directions, the air inlet duct on the rear side of the square box extends forward to be adjacent to the filter screen, and the air inlet duct on the front side of the square box extends backward to be adjacent to the filter screen. Adjacent; the gap between the air inlet duct and the filter screen is less than or equal to 3 mm; The square box is provided with a filter decontamination device along the left and right directions for passively cleaning the filter during the rotation of the filter. The filter decontamination device is located below the air inlet duct and above the lower filter drum; The bottom wall of the square box body on the front and rear sides of the filter screen decontamination device is symmetrically provided with a pollution discharge structure; The lowest part of the sewage trough is connected with a sewage pipe, and the sewage pipe is provided with a sewage valve; the side wall of the box at the sewage trough is provided with a vertically arranged transparent observation window. 2. The self-cleaning non-stop filtering air inlet filter mechanism for a cable tunnel according to claim 1, characterized in that: the flange mounting structure comprises an air duct flange arranged radially protruding on the air inlet air duct and The box flanges are arranged radially on both sides of the square box body, and the air duct flanges are arranged at intervals along the length direction of the air inlet air duct; The box flange and the air duct flange are in one-to-one correspondence. There is a rubber gasket between the box flange and the air duct flange. The box flange and the air duct flange pass through the box flange. The plate, the rubber pad and the air duct flange are fixedly connected with the fastening bolts, and the fastening bolts are evenly arranged along the circumference of the box flange and the air duct flange. 3. The self-cleaning non-stop filtering air inlet filter mechanism for cable tunnels according to claim 1, characterized in that: the upper filter screen drum and the lower filter screen drum are radially recessed and provided with a filter screen for winding around The installation groove of the filter screen is wound between the installation groove of the upper filter screen drum and the installation groove of the lower filter screen drum. 4. The self-cleaning non-stop filtering air inlet filter mechanism for cable tunnels according to any one of claims 1 to 3, wherein the filter screen decontamination device comprises a positive filter located on the axis of the lower screen drum. The upper clapboard, the clapboard extends along the left and right direction and is fixedly connected with the left and right side walls of the square box; The lower limit plate, the upper limit plate and the lower limit plate extend along the left and right directions and are fixedly connected with the left side wall and the right side wall of the square box; The filter screen on the rear side of the upper filter screen drum and the lower filter screen drum forms the second half of the filter screen, and the filter screen on the front side of the upper filter screen drum and the lower filter screen drum forms the first half of the filter screen; A rear top pressing block is arranged behind the rear half of the filter screen, and a rear sliding block is arranged in front of the rear half of the filter screen. The rear top pressing block extends along the left and right directions and is fixedly connected with the left and right side walls of the square box; The front end of the rear slider is located between the upper limit plate and the lower limit plate and is slidingly matched with the upper limit plate and the lower limit plate. A rear spring is pressed between the rear slider and the partition plate, and the rear spring pushes the rear slider backward to press the rear half of the filter screen on the rear top pressure block; the front side of the rear top pressure block and the rear of the rear slider The sides are all wear-resistant rubber surfaces; the upper surface of the rear top pressure block and the upper surface of the rear slider are located in the same inclined plane with front high and rear low; A front top pressure block is arranged in front of the front half of the filter screen, and a front slider is arranged behind the front half of the filter screen. The front top pressure block extends along the left and right directions and is fixedly connected with the left and right side walls of the square box; The rear end of the front slider is located between the upper limit plate and the lower limit plate and is slidingly matched with the upper limit plate and the lower limit plate. ; A front spring is pressed between the front slider and the partition, and the front spring pushes the front slider forward to press the front half of the filter screen on the front top pressure block; the rear side of the front top pressure block and the front slider The front sides are all wear-resistant rubber surfaces; the upper surface of the front top pressure block and the upper surface of the front slider are located in the same inclined plane with high rear and front low; The rotation direction of the filter screen during normal operation is that the second half of the filter screen runs from top to bottom, and the upper surface of the rear top pressing block and the upper surface of the front top pressing block are both smooth surfaces. 5. The self-cleaning and non-stop filtering air inlet filter mechanism for cable tunnels according to claim 4, characterized in that: the square boxes at the upper filter screen drum and the upper air blocking drum are horizontally protruded along the left and right directions respectively. Upper groove, the upper groove is part of the square box; The upper filter drum and the upper air blocking drum both extend into the upper groove along the left and right directions; the distance between the upper filter drum and the lower side wall of the upper groove is less than or equal to 3 mm, and the center of the upper filter drum and the upper air blocking drum The shafts are installed on the groove bottom of the upper groove through bearings, and the distance between the upper filter drum and the upper air blocking drum from the groove bottom of the upper groove on the left and right sides is less than or equal to 3 mm; The square box body at the lower filter screen drum and the lower air blocking drum is respectively horizontally protruded with lower grooves along the left and right directions, and the lower groove is a part of the square box body; The lower filter drum and the lower air blocking drum both extend into the lower groove along the left and right directions; the distance between the lower filter drum and the upper side wall of the lower groove is less than or equal to 3 mm, and the center of the lower filter drum and the lower air blocking drum The shafts are installed on the groove bottom of the lower groove through bearings, and the distance between the lower filter drum and the lower air blocking drum from the groove bottom of the lower groove on the left and right sides is less than or equal to 3 mm. 6. the decontamination method of the air inlet filter mechanism that self-cleaning does not stop filtering in the cable tunnel described in claim 4, it is characterized in that: During normal operation, the filter screen rotates forward, and the rotation direction of the filter screen is the second half of the filter screen running from top to bottom; when there is inseparable dirt attached to the filter screen during the forward rotation of the filter screen, control the positive and negative The rotating motor drives the filter screen to rotate forward and reverse alternately, so that the filter screen passes through the filter screen decontamination device alternately in forward and reverse directions.

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