Electrostatic dust collection device for tunnel air purification

Abstract

The utility model relates to the technical field of tunnel dust falling or dust removal, in particular to an electrostatic dust removal device for tunnel air purification, which comprises an electrostatic dust removal body, and the electrostatic dust removal body comprises a horizontally arranged ventilation pipeline, an electrostatic dust remover and an air suction device, a front filter screen is arranged in the ventilation pipeline, a dust collector is arranged at the bottom of the ventilation pipeline, the dust collector is communicated with the ventilation pipeline and located below the front filter screen, and the dust collector, the front filter screen, the electrostatic dust collector and the air suction device are sequentially arranged in the wind flowing direction in the ventilation pipeline. By adopting the scheme, the technical problem that small-particle-size dust cannot be effectively adsorbed after the dust collection plate adsorbs large-particle-size dust in the prior art can be solved, the interference of the large-particle-size dust on the adsorption of the small-particle-size dust by the dust collection plate is reduced, and the adsorption effect of the dust collection plate on the small-particle-size dust is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel dust reduction or dust removal, in particular to an electrostatic dust removal device for tunnel air purification. Background Art

[0002] During tunnel construction, large amounts of dust are generated, posing a serious health threat to workers inside the tunnel. Furthermore, after the tunnel is completed and opened to traffic, residual dust from construction, friction between wheels and the road surface, and impurities from outside the tunnel introduced by vehicles during driving contribute to increased dust levels within the tunnel. Large amounts of dust in the tunnel, firstly, interfere with the driver's vision, making visibility even lower in the already poor tunnel environment; secondly, dust can easily enter equipment within the tunnel, causing equipment anomalies or failures, creating significant safety hazards and increasing the frequency of maintenance. Maintenance within the tunnel will interfere with the tunnel's operation, further increasing safety risks. Therefore, existing technologies employ dust removal devices within the tunnel to collect and uniformly process dust within the tunnel.

[0003] In the prior art, the dust removal devices used in tunnels are mainly bag filters and electrostatic dust collectors, of which electrostatic dust collectors include dry electrostatic dust collectors and wet electrostatic dust collectors. Dry electrostatic dust collectors primarily charge the dust through a discharge stage, then set up dust collecting plates with an opposite charge to the dust. The dust is then moved toward the dust collecting plates by the charge and adheres to them, achieving dust collection. The dust cake on the dust collecting plates is then cleaned and collected by a cleaning mechanism. Wet electrostatic dust collectors, on the other hand, add a spray mechanism to dry electrostatic dust collectors to continuously spray water mist onto the dust collecting plates, maintaining a layer of flowing water film on the dust collecting plates. The flowing water film removes the dust adsorbed by the dust collecting plates. Wet electrostatic dust collectors require a continuous supply of clean water, as well as the recycling and discharge of dust-laden wastewater. The installation and use of the corresponding structure in a tunnel environment is difficult to achieve, so dry electrostatic dust collectors are mostly used in existing tunnels.

[0004] However, the existing dry electrostatic precipitator relies on the dust's charging ability for adsorption. Dust particles have different sizes. When ionized by the discharge electrode, particles with larger sizes carry more charge and adhere to the dust collecting plate more quickly. As a result, when subsequent small particles are adsorbed, they are farther away from the dust collecting plate, and their adsorption ability becomes weaker. They may fall off the dust collecting plate under the action of airflow, thereby reducing the dust removal effect of the electrostatic precipitator. Utility Model Content

[0005] The utility model aims to provide an electrostatic dust removal device for tunnel air purification, so as to solve the technical problem in the prior art that the dust collecting plate cannot effectively absorb small-sized dust after absorbing large-sized dust.

[0006] The utility model provides the following basic solutions:

[0007] An electrostatic dust removal device for tunnel air purification includes an electrostatic dust removal body, which includes a horizontally arranged ventilation duct, and an electrostatic dust collector and an air suction device arranged in the ventilation duct; a pre-filter is provided in the ventilation duct, and a dust collector is provided at the bottom of the ventilation duct, the dust collector is connected to the ventilation duct, and the dust collector is located below the pre-filter. The dust collector, the pre-filter, the electrostatic dust collector and the air suction device are arranged in sequence along the wind flow direction in the ventilation duct.

[0008] Furthermore, the pre-filter is vertically arranged and elastically connected to the pipe wall of the ventilation duct.

[0009] Furthermore, the blocking block closes the mouth of the sliding cavity, and a first air vent is provided at the end of the blocking block along the wind flow direction, and the other end of the first air vent is connected to the sliding cavity; the bottom of the blocking block abuts against the end of the blocking block after sliding over the guide slope, and closes the mouth of the first air vent; a second air vent is provided on the inner wall of the sliding cavity, and the other end of the second air vent is connected to the ventilation duct, and the pre-filter and one end of the second vent connected to the ventilation duct are arranged in sequence along the wind flow direction.

[0010] Furthermore, a sliding cavity is provided on the wall of the ventilation duct, and a blocking block is slidably connected in the sliding cavity. The top of the blocking block can extend out of the sliding cavity. A guide slope is provided on the top of the blocking block, and the guide slope can be against the bottom of the pre-filter. The blocking block is located on the moving path of the pre-filter under the wind force, and a dust removal elastic part is provided between the bottom of the blocking block and the bottom of the sliding cavity.

[0011] Furthermore, the blocking block closes the mouth of the sliding cavity, and a first air vent is provided on the inner wall of the sliding cavity, the other end of the first air vent is connected to the ventilation duct, and after the pre-filter slides over the blocking block, it abuts against the inner wall of the ventilation duct and can close the mouth of the first air vent; a second air vent is provided on the inner wall of the sliding cavity, the other end of the second vent is connected to the ventilation duct, and the pre-filter and one end of the second vent are connected to the ventilation duct are arranged in sequence along the direction of wind flow.

[0012] Furthermore, a connecting seat is provided in the ventilation duct, and a reset elastic member is provided between the connecting seat and the pre-filter. The axial direction of the reset elastic member is the same as the wind flow direction. The connecting seat, the reset elastic member and the pre-filter are arranged in sequence along the wind flow direction.

[0013] Furthermore, the ends of the pre-filter and the blocking block are both provided with reset cambered surfaces, and the two reset cambered surfaces are offset against each other.

[0014] Furthermore, an elastic layer is provided on one side where the ends of the pre-filter screen and the blocking block abut against each other.

[0015] Furthermore, the opening where the dust collector communicates with the ventilation duct is located between the connecting seat and the pre-filter.

[0016] Furthermore, the resetting elastic member is a tension spring.

[0017] Beneficial effects:

[0018] 1. In this scheme, a pre-filter is set in front of the electrostatic precipitator. The pre-filter is used to filter large-particle dust, thereby reducing the large-particle dust that subsequently enters the electrostatic precipitator, thereby reducing the large-particle dust adsorbed by the dust collecting plate in the electrostatic precipitator, reducing the interference of large-particle dust on the adsorption of small-particle dust by the dust collecting plate, and improving the adsorption effect of the dust collecting plate on small-particle dust.

[0019] 2. In this solution, the pre-filter is elastically connected to the ventilation duct. The wind flow in the ventilation duct is unstable. The unstable flow separation causes the pre-filter to shake, shaking off some of the large-particle dust blocked by the pre-filter. The dust falls to the dust collector below for collection, reducing the amount of secondary dust. At the same time, when the pre-filter is blocked by large-particle dust, due to the operation of the suction fan and the action of wind, the pre-filter moves backward and counteracts the blocking block. The blocking block is forced to move downward and gradually moves into the sliding cavity. At this time, the pre-filter slides over the guide slope and falls from the top of the end of the blocking block to collide with the ventilation duct. In this process, the falling of the pre-filter and the collision with the ventilation duct cause most of the dust on the pre-filter to be shaken off and slide down along the guide slope into the dust collector. This solution uses the vibration caused by the sliding and collision of the pre-filter to clean the large-particle dust blocked on the pre-filter, thereby ensuring the filtering effect of the pre-filter on large-particle dust, thereby reducing the large-particle dust entering the subsequent electrostatic precipitator, reducing the interference of large-particle dust on the dust collecting plate's adsorption of small-particle dust, and improving the dust collecting plate's adsorption effect on small-particle dust.

[0020] 3. In this solution, when the pre-filter is filtering dust, the first vent and the second vent are both connected to the ventilation duct. After the pre-filter collides with the ventilation duct, the pre-filter is acted upon by the reset elastic member, but cannot be reset due to the obstruction of the blocking block. At this time, the first vent is closed, and only the second vent is ventilated. Under the action of the air suction device, negative pressure gradually forms in the sliding cavity, causing the blocking block to move downward, and the pre-filter is reset under the action of the reset elastic member. During the reset process, the pre-filter vibrates again, reducing the dust attached to the pre-filter. Through this solution, large-particle dust on the pre-filter is automatically removed, ensuring the filtering effect of the pre-filter on large-particle dust. At the same time, large-particle dust is collected by the dust collector, and can be subsequently cleaned by cleaning the dust collector, thereby reducing the maintenance work of tunnel maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of a first embodiment of an electrostatic dust removal device for tunnel air purification according to the present utility model;

[0022] Figure 2This is a partial cross-sectional view of a first embodiment of an electrostatic dust removal device for tunnel air purification according to the present utility model;

[0023] Figure 3 This is a partial cross-sectional view of another state of the first embodiment of an electrostatic dust removal device for tunnel air purification according to the present utility model;

[0024] Figure 4 This is a partial cross-sectional view of a second embodiment of an electrostatic dust removal device for tunnel air purification according to the present utility model;

[0025] Figure 5 This is a partial cross-sectional view of another state of the second embodiment of the utility model of an electrostatic dust removal device for tunnel air purification. DETAILED DESCRIPTION

[0026] The following is further described in detail through specific implementation methods:

[0027] The figure marks in the drawings of the specification include: ventilation duct 1, electrostatic precipitator 2, air suction device 3, pre-filter 4, connecting seat 5, reset elastic member 6, dust collector 7, blocking block 8, dust removal elastic member 9, first air vent 10, and second air vent 11.

[0028] Example 1

[0029] An electrostatic dust removal device for tunnel air purification, such as the attached Figure 1 As shown, the electrostatic precipitator comprises an electrostatic precipitator body, which includes a horizontally arranged ventilation duct, an electrostatic precipitator 2, and an air suction device 3 disposed within the ventilation duct. A pre-filter 4 is provided within the ventilation duct, and a dust collector 7 is provided at the bottom of the ventilation duct, connected to the ventilation duct and located below the pre-filter 4. The dust collector 7, pre-filter 4, electrostatic precipitator 2, and air suction device 3 are arranged sequentially along the direction of wind flow within the ventilation duct. The electrostatic precipitator 2 utilizes existing dry electrostatic precipitators, which include a discharge electrode and a dust collecting plate. The discharge electrode ionizes the gas, causing the dust to become charged, thereby being attracted to and attached to the dust collecting plate. Dry electrostatic precipitators are a well-established prior art and are not the subject of this invention, so they will not be described in detail. The air suction device 3 utilizes an existing tunnel fan. The rotation of the fan blades creates negative pressure, drawing air from the tunnel through one end of the ventilation duct and blowing it out through the other end. Tunnel fans are also well-established prior art and are not the subject of this invention, so they will not be described in detail. The electrostatic precipitator 2 and the adsorber are installed inside the ventilation duct by screws, and the installation structure thereof is also conventional.

[0030] The ventilation duct is arranged horizontally. In this embodiment, the end face of the ventilation duct is rectangular. The pre-filter 4 is arranged vertically, that is, the end face of the pre-filter 4 is parallel to the end face of the ventilation duct.

[0031] The pre-filter 4 is elastically connected to the wall of the ventilation duct. Specifically, a connecting seat 5 is provided within the ventilation duct, extending from the wall in the axial direction of the ventilation duct. In this embodiment, the connecting seat 5 is welded to the wall of the ventilation duct. A return spring 6 is provided between the connecting seat 5 and the pre-filter 4. The axial direction of the return spring 6 is aligned with the wind flow direction. The connecting seat 5, return spring 6, and pre-filter 4 are arranged in this order along the wind flow direction. In this embodiment, the pre-filter 4 and the ventilation duct are elastically connected by a spring and a reset elastic member 6. The reset elastic member 6 is located at the bottom of the pre-filter 4. There are three springs, which are respectively located at the top and both ends of the pre-filter 4. The two ends of the spring are fixedly connected to the edge of the pre-filter 4 and the inner tube wall of the ventilation duct by screws. In order to reduce the large particles of dust passing through, a spring groove for accommodating the spring is opened on the inner wall of the ventilation duct. A section of the spring is fixed in the spring groove by a screw. At the same time, the spring groove can also avoid interfering with the movement of the spring. The reset elastic member 6 is a tension spring, and the two ends of the tension spring are respectively hung with the edge of the pre-filter 4 and the connecting seat 5.

[0032] As attached Figure 2 As shown, a dust collecting port is provided at the bottom of the ventilation duct, and both ends of the dust collecting port are connected to the dust collector 7 and the ventilation duct. The opening of the dust collector 7 that is connected to the ventilation duct is located between the connecting seat 5 and the pre-filter 4, that is, the dust collecting port is located between the connecting seat 5 and the pre-filter 4. In this embodiment, the dust collector 7 is fixed to the bottom of the ventilation duct by screws. A dust outlet is provided at the bottom of the dust collector 7, and the bottom of the dust collector 7 is inclined toward the dust outlet, and the dust outlet is connected to a closing cover by a thread. Large-particle dust that falls from the pre-filter 4 enters the dust collector 7 through the dust collecting port, thereby achieving the collection of large-particle dust and avoiding secondary flying. The dust in the dust collector 7 is moved toward the dust outlet and accumulated due to the inclined setting of the bottom of the dust collector 7. Subsequent tunnel maintenance personnel can open the dust outlet regularly to clean the dust.

[0033] A sliding cavity is provided on the wall of the ventilation duct, and a blocking block 8 is slidably connected to the sliding cavity. The top of the blocking block 8 can extend out of the sliding cavity. A guide slope is provided on the top of the blocking block 8, and the guide slope can be against the bottom of the pre-filter 4. The blocking block 8 is located on the moving path of the pre-filter 4 moved by wind force, and a dust removal elastic part 9 is provided between the bottom of the blocking block 8 and the bottom of the sliding cavity.

[0034] Specifically, the mouth of the sliding cavity faces the inside of the ventilation duct, and the blocking block 8 can slide axially along the sliding cavity toward the ventilation duct. When the top of the blocking block 8 is subjected to the force of the pre-filter 4, it can be received in the sliding cavity, and the guiding slope is inclined from the pipe wall of the ventilation duct to the axial direction along the wind flow direction.

[0035] Since the blocking block 8 is located on the moving path of the pre-filter 4 under the influence of wind force, when the pre-filter 4 is blocked, the pre-filter 4 is moved toward the blocking block 8 under the influence of the negative pressure and wind force generated by the air suction device 3, and resists the guide slope, moves along the guide slope, falls from the end of the blocking block 8, and collides with the inner wall of the ventilation duct. Figure 3 As shown. The falling of the pre-filter 4 and the collision with the ventilation duct cause most of the dust on the pre-filter 4 to be shaken off. At this time, under the action of the reset elastic member 6, the pre-filter 4 is against the blocking block 8, and the falling dust slides down along the guide slope into the dust collector 7. In this embodiment, the dust removal elastic member 9 is a compression spring, and the two ends of the compression spring are respectively connected to the blocking block 8 and the sliding cavity. When the pre-filter 4 is against the guide slope, the compression spring is compressed and the blocking block 8 moves downward. When the pre-filter 4 falls, the compression spring is reset, and the blocking block 8 moves upward, preventing the pre-filter 4 from resetting.

[0036] Large-sized dust is filtered by the pre-filter 4, and at the same time, most of the dust on the pre-filter 4 is shaken off by the falling of the pre-filter 4 and the collision with the ventilation duct, thereby reducing the large-sized dust that subsequently enters the electrostatic precipitator 2, thereby reducing the large-sized dust adsorbed by the dust collecting plate in the electrostatic precipitator 2, reducing the interference of large-sized dust on the adsorption of small-sized dust by the dust collecting plate, and improving the adsorption effect of the dust collecting plate on small-sized dust.

[0037] Example 2

[0038] The difference between this embodiment and the first embodiment is that:

[0039] An electrostatic dust removal device for tunnel air purification, as shown in the following Figure 4 As shown, the blocking block 8 closes the mouth of the sliding cavity, the inner wall of the sliding cavity is provided with a first vent 10, the other end of the first vent 10 is connected to the ventilation duct, and after the pre-filter 4 slides over the blocking block 8, it abuts against the inner wall of the ventilation duct and can close the mouth of the first vent 10; the inner wall of the sliding cavity is provided with a second vent 11, the other end of the second vent 11 is connected to the ventilation duct, and the pre-filter 4 and the second vent 11 are connected to one end of the ventilation duct and are arranged in sequence along the wind flow direction.

[0040] Specifically, a first vent hole 10 is provided on the sliding cavity, and the mouth of the first vent hole 10 is located at the inner wall of the ventilation duct and the inner wall of the sliding cavity respectively. When the front filter 4 abuts against the end of the blocking block 8, the bottom of the front filter 4 closes the first vent hole 10 at the mouth of the ventilation duct, as shown in the attached Figure 5 The sliding cavity is also provided with a second vent hole 11 , and the openings of the first vent hole 10 are also located on the inner wall of the ventilation duct and the inner wall of the sliding cavity, respectively, but the second vent hole 11 will not be blocked by the pre-filter 4 .

[0041] After the pre-filter 4 collides with the ventilation duct, the pre-filter 4 is acted upon by the reset elastic member 6, but cannot be reset due to the obstruction of the blocking block 8. At this time, the first vent 10 is closed, and only the second vent 11 is ventilated. Under the action of the air suction device 3, negative pressure gradually forms in the sliding cavity, causing the blocking block 8 to move downward. The blocking block 8 no longer blocks the pre-filter 4, and the pre-filter 4 is reset under the action of the reset elastic member 6, that is, the pre-filter 4 slides back over the blocking block 8. During the reset process, the pre-filter 4 shakes again, reducing the dust attached to the pre-filter 4, thereby ensuring the filtering effect of the pre-filter 4 on large-particle dust, thereby reducing the large-particle dust entering the subsequent electrostatic precipitator 2, reducing the interference of large-particle dust on the dust collecting plate adsorbing small-particle dust, and improving the dust collecting plate's adsorption effect on small-particle dust.

[0042] Example 3

[0043] The difference between this embodiment and the first embodiment is that:

[0044] In an electrostatic dust removal device for tunnel air purification, a blocking block 8 closes the mouth of a sliding cavity, and a first vent 10 is provided at the end of the blocking block 8 along the direction of wind flow, and the other end of the first vent 10 is connected to the sliding cavity. The ends of the pre-filter 4 and the blocking block 8 are both provided with reset arc surfaces, and the two reset arc surfaces abut against each other. After sliding over the guide slope, the bottom of the blocking block 8 abuts against the end of the blocking block 8 and closes the mouth of the first vent 10. An elastic layer is provided on the side where the ends of the pre-filter 4 and the blocking block 8 abut against each other. A second vent 11 is provided on the inner wall of the sliding cavity, and the other end of the second vent 11 is connected to the ventilation duct. The pre-filter 4 and the second vent 11 are connected to one end of the ventilation duct and are arranged in sequence along the direction of wind flow.

[0045] Specifically, the mouth of the first vent 10 is located at the bottom and end of the blocking block 8, respectively. When the pre-filter 4 abuts against the end of the blocking block 8, the pre-filter 4 closes the mouth of the first vent 10 located at the end of the blocking block 8. The setting of the reset arc surface makes it easy for the pre-filter 4 to slide against the blocking block 8. After the blocking block 8 moves down, the pre-filter 4 can quickly slide over the guide slope under the action of the reset elastic member 6. In this embodiment, an elastic layer is bonded to the side where the pre-filter 4 and the end of the blocking block 8 abut against each other, and the elastic layer is rubber. The elastic rubber is used to enhance the wind sealing effect of the first vent 10, and at the same time, the sealing margin can be increased to achieve the sealing of the first vent 10.

[0046] The above is only an embodiment of the present utility model. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for technicians in this field, without departing from the structure of the utility model, several variations and improvements can be made, which should also be regarded as the scope of protection of the utility model. These will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An electrostatic precipitator for tunnel air purification, comprising an electrostatic precipitator body, the electrostatic precipitator body comprising a horizontally arranged ventilation duct, and an electrostatic precipitator and an air suction device arranged in the ventilation duct; characterized in that: A pre-filter is provided in the ventilation duct, and a dust collector is provided at the bottom of the ventilation duct. The dust collector is connected to the ventilation duct and is located below the pre-filter. The dust collector, pre-filter, electrostatic precipitator and air suction device are arranged in sequence along the wind flow direction in the ventilation duct.

2. The electrostatic dust removal device for tunnel air purification according to claim 1, characterized in that: The pre-filter is vertically arranged and elastically connected to the pipe wall of the ventilation duct.

3. The electrostatic dust removal device for tunnel air purification according to claim 2, characterized in that: A sliding cavity is provided on the wall of the ventilation duct, and a blocking block is slidably connected in the sliding cavity. The top of the blocking block can extend out of the sliding cavity. A guide slope is provided on the top of the blocking block, and the guide slope can be against the bottom of the pre-filter. The blocking block is located on the moving path of the pre-filter moved by wind force, and a dust removal elastic part is provided between the bottom of the blocking block and the bottom of the sliding cavity.

4. The electrostatic dust removal device for tunnel air purification according to claim 3, characterized in that: A connecting seat is provided in the ventilation duct, and a reset elastic member is provided between the connecting seat and the pre-filter. The axial direction of the reset elastic member is the same as the wind flow direction. The connecting seat, the reset elastic member and the pre-filter are arranged in sequence along the wind flow direction.

5. The electrostatic dust removal device for tunnel air purification according to claim 4, characterized in that: The blocking block closes the mouth of the sliding cavity, and a first air vent is provided at the end of the blocking block along the wind flow direction, and the other end of the first air vent is connected to the sliding cavity; the bottom of the blocking block abuts against the end of the blocking block after sliding over the guide slope, and closes the mouth of the first air vent; a second air vent is provided on the inner wall of the sliding cavity, and the other end of the second air vent is connected to the ventilation duct, and the pre-filter and one end of the second vent connected to the ventilation duct are arranged in sequence along the wind flow direction.

6. The electrostatic dust removal device for tunnel air purification according to claim 4, characterized in that: The blocking block closes the mouth of the sliding cavity, and a first air vent is provided on the inner wall of the sliding cavity. The other end of the first air vent is connected to the ventilation duct. After the pre-filter slides over the blocking block, it abuts against the inner wall of the ventilation duct and can close the mouth of the first air vent; a second air vent is provided on the inner wall of the sliding cavity, and the other end of the second air vent is connected to the ventilation duct. The pre-filter and one end of the second vent are connected to the ventilation duct and are arranged in sequence along the direction of wind flow.

7. The electrostatic dust removal device for tunnel air purification according to claim 5, characterized in that: The ends of the pre-filter and the blocking block are both provided with reset cambered surfaces, and the two reset cambered surfaces are opposed to each other.

8. The electrostatic dust removal device for tunnel air purification according to claim 7, characterized in that: The sides where the ends of the pre-filter screen and the blocking block abut against each other are both provided with elastic layers.

9. The electrostatic dust removal device for tunnel air purification according to claim 1, characterized in that: The opening where the dust collector is connected to the ventilation duct is located between the connecting seat and the pre-filter.

10. The electrostatic dust removal device for tunnel air purification according to claim 4, characterized in that: The resetting elastic member is a tension spring.

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