A full performance test platform for gas filters in tunnels

Abstract

The present invention relates to the technical field of detection devices, and in particular to a full-performance test platform for gas filters in tunnels. A full-performance test platform for gas filters in tunnels comprises a bracket, a detection mechanism and two air boxes. The detection mechanism comprises a detection box and a filter. Each air box is provided with a first conical surface and a second conical surface. The upper shell is provided with a third conical surface, and the lower shell is provided with a fourth conical surface. When the filter needs to be removed, the upper shell and the lower shell are moved away from each other, and the first conical surface and the third conical surface, the second conical surface and the fourth conical surface are separated respectively. The detection box is rotated forward, and the filter is exposed, which facilitates the removal of the filter. The filter is removed or installed by rotating the detection box, which is not easily damaged, thereby reducing the manufacturing cost. The present invention provides a full-performance test platform for gas filters in tunnels to solve the problem that when replacing the filter in the existing air purification system, the positioning device for positioning the installation chamber and the front chamber of the filter is easily damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and in particular to a full-performance test platform for gas filters in tunnels. Background Art

[0002] A filter test bench is a device or system specifically designed for testing and evaluating filter performance. As tunnel construction expands, NOx, PM, and toxic gas pollution within tunnels are becoming increasingly prominent. Traditional solutions rely on a combination of electrostatic precipitators and denitrification devices, but these solutions suffer from high maintenance costs for activated carbon adsorption systems and insufficiently stable filtration efficiency. In recent years, tunnel-specific filters have continued to improve, including array-type activated carbon filter structures that optimize airflow distribution and modular quick-release designs that improve maintenance efficiency. These innovations require standardized test benches to verify their actual performance.

[0003] The test platform includes a centrifugal fan, nitrogen oxide generator, aerosol generator, air duct, muffler, sampling tube, rectifier, reducer, flexible connector, nitrogen oxide detector, temperature and humidity meter, micro differential pressure transmitter sensor, wind speed transmitter, ozone detector, particulate matter detector, etc. When installing the filter, it is necessary to position the filter to prevent gaps between the filter and the housing due to improper installation.

[0004] The test process is as follows: start the variable frequency fan, determine the wind speed and air volume in the air duct through the wind speed transmitter, and 风管 × Duct cross-sectional area S 风管 = wind speed v passing through the filter × filter cross-sectional area S, convert the wind speed v passing through the filter corresponding to the fan operating frequency. There are two sources of pollution, namely nitrogen oxides and particulate pollutants (PM 10 / PM 2.5 ) According to the properties of the filter, the corresponding pollutants are emitted. The generated polluted gas passes through the air duct, is rectified by the rectifier grid into a more uniform airflow, and enters the air duct. At this time, the micro-pressure differential transmitter, nitrogen oxide detector, and particulate matter detector distributed upstream of the air duct monitor the airflow. After the airflow passes through the filter, the purified clean air enters the downstream air duct and is monitored by the instruments distributed downstream at the same time. Finally, it is discharged to the outside atmosphere through the fan. The fan provides power for suction, so that the entire test process is under negative pressure to prevent the overflow of polluted gases. According to different test purposes and project needs, this test bench can test the resistance and PM of filters of different specifications at different wind speeds. 2.5 / PM 10 Testing of purification efficiency and nitrogen oxide purification efficiency.

[0005] For example, the utility model patent with announcement number CN216367143U provides a micro highway tunnel air purification system capable of testing the degradation rates of target exhaust gases under different operating conditions using particulate matter and dust removal equipment and nitrogen oxide removal equipment, providing experimental data and theoretical basis for their practical application in engineering projects. However, to facilitate the replacement of different filters, this system requires the installation of slide rails in the filter mounting chamber and its pre-chamber. However, these slide rails are easily damaged, which not only increases the difficulty of replacement but also results in a loose seal between the mounting chamber and the pre-chamber. Summary of the Invention

[0006] The present invention provides a full-performance test platform for gas filters in tunnels, so as to solve the problem that a positioning device for positioning an installation chamber and a front chamber of a filter is easily damaged when replacing the filter in an existing air purification system.

[0007] The present invention employs the following technical solution for a full-performance test platform for gas filters in tunnels: The platform comprises a support, two gas boxes, and a detection mechanism disposed between the two boxes. The gas boxes are mounted on the support, with the two boxes arranged horizontally. Each gas box has a first conical surface and a second conical surface, both concave surfaces facing the detection mechanism, disposed on the side adjacent to the detection mechanism. The first conical surface is located above the second conical surface. From top to bottom, the radius of the first conical surface decreases, while the radius of the second conical surface increases.

[0008] The detection mechanism includes a detection box rotatably mounted on a bracket and a filter within the detection box. The detection box comprises an upper shell and a lower shell that can move away from or toward each other. A third conical surface is provided on both sides of the upper shell, designed to abut against and be parallel to the first conical surface. A fourth conical surface is provided on both sides of the lower shell, designed to abut against and be parallel to the second conical surface. The sides of the detection box with the third and fourth conical surfaces are connected to the air box.

[0009] The detection mechanism has a first state and a second state. In the first state, the first and third conical surfaces, as well as the second and fourth conical surfaces, abut against each other, and the detection box and the air box are connected. In the second state, the first and third conical surfaces, as well as the second and fourth conical surfaces, are disengaged, and the detection box and the air box are disconnected. Moving the upper and lower shells apart and rotating the detection box forward shifts the detection mechanism from the first state to the second state, allowing the filter to be removed.

[0010] Furthermore, each first conical surface is provided with a first channel connected to the gas box. Each second conical surface is provided with a second channel connected to the gas box. Each third conical surface is provided with a third channel connected to the detection box, and the third channel is used to communicate with the first channel to allow gas to pass through. Each fourth conical surface is provided with a fourth channel connected to the detection box, and the fourth channel is used to communicate with the second channel to allow gas to pass through.

[0011] Furthermore, a full-performance test platform for gas filters in tunnels also includes a clamping mechanism. The clamping mechanism includes an upper positioning plate and a lower positioning plate. The upper positioning plate is slidably mounted on the upper shell, while the lower positioning plate is slidably mounted on the lower shell. The upper and lower positioning plates are brought into close proximity to clamp the filter.

[0012] Furthermore, the clamping mechanism also includes two return springs, one return spring connecting the upper positioning plate and the upper shell, and the other return spring connecting the lower positioning plate and the lower shell.

[0013] Furthermore, the detection mechanism includes multiple connecting assemblies, which are sequentially distributed along the circumference of the detection box. Each connecting assembly includes a rotating shaft and a knob. The knob's axis is vertically arranged, and the knob is rotatable about its axis on the upper shell. The rotating shaft is arranged on the lower shell, and a threaded rod is fixed to the rotating shaft. The threaded rod is vertically arranged and threadedly engages with the knob. Rotating the knob causes the upper and lower shells to move away from or closer to each other.

[0014] Furthermore, the detection mechanism also includes a rotating assembly, which includes a rotating seat. The rotating seat is arranged on the bracket and is located below the detection box. The rotating seat is used to abut against the lower shell and limit the downward movement distance of the lower shell.

[0015] Furthermore, the rotating base includes a fixed plate and a rotating column. The fixed plate is fixedly mounted on the bracket. The rotating column is vertically arranged and rotatably mounted on the fixed plate around its own axis. The lower shell includes a housing and a connecting column. The connecting column is fixedly connected to the housing and is located in the middle of the housing. The connecting column and the rotating column are coaxially arranged and can frictionally contact each other. When the detection box rotates, it rotates around the connecting column as the center of rotation.

[0016] Furthermore, a full-performance test platform for gas filters in a tunnel also includes a baffle, which is fixed on a bracket and is used to limit the position of the reverse rotation of the detection box so that the detection box can be parallel and aligned with the gas box.

[0017] Furthermore, a handle is fixedly provided on the detection box.

[0018] Furthermore, a full-performance test platform for gas filters in tunnels also includes an aerosol generator, a particulate matter detector, a nitrogen oxide generator, a micro-differential pressure transmitter, a wind speed transmitter, a nitrogen oxide detector, an ozone detector, a rectifier, a first air duct, an upstream particulate matter sampling chamber, a downstream particulate matter sampling chamber, a second air duct, and a fan chamber. The first air duct, the upstream particulate matter sampling chamber, an air box, a detection box, another air box, the downstream particulate matter sampling chamber, the second air duct, and the fan chamber are connected in sequence. A fan is installed in the fan chamber, which performs a suction function and provides airflow from one air box to the other.

[0019] The beneficial effects of the present invention are as follows: a full-performance test platform for a gas filter in a tunnel of the present invention is provided with a detection mechanism. In an initial state, the detection mechanism is in a first state, the detection box and the gas box are connected, and the filter filters the air passing through the detection box.

[0020] To remove the filter, move the upper and lower shells away from each other, separating the first and third conical surfaces, and the second and fourth conical surfaces. Then, rotate the detection box forward to disconnect the detection box and the air box. The detection mechanism then transitions from the first state to the second state, exposing the filter and facilitating its removal.

[0021] The first and third conical surfaces, and the second and fourth conical surfaces, abut against each other to seal the gap between the inspection box and the air box, ensuring a tight seal between the two. Once the upper and lower shells move away from each other and the first, third, second, and fourth conical surfaces are disengaged, the first, second, third, and fourth conical surfaces will not interfere with the rotation of the inspection box. Removing or installing the filter by rotating the inspection box is convenient, less prone to damage, improves mounting accuracy, and reduces manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of a full-performance test platform for gas filters in tunnels provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of a partial structure of a full-performance test platform for gas filters in tunnels provided by an embodiment of the present invention;

[0025] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 A partial structural cross-sectional view of a full-performance test platform for a gas filter in a tunnel provided by an embodiment of the present invention;

[0027] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0028] Figure 6 A schematic diagram of an embodiment of a gas filter full performance test platform in a tunnel provided by the present invention, wherein the upper shell and the lower shell are spaced apart from each other;

[0029] Figure 7 A schematic structural diagram of a detection mechanism of a full-performance test platform for a gas filter in a tunnel provided by an embodiment of the present invention when in a second state;

[0030] Figure 8 A schematic structural diagram of a detection mechanism of a full-performance test platform for a gas filter in a tunnel provided by an embodiment of the present invention;

[0031] Figure 9 A rear view of a partial structure of a full-performance test platform for gas filters in tunnels provided by an embodiment of the present invention;

[0032] Figure 10 A schematic diagram of the instrument layout in a full-performance test platform for a gas filter in a tunnel provided by an embodiment of the present invention;

[0033] Figure 11 A schematic diagram of the working process of a detection mechanism of a full-performance test platform for gas filters in a tunnel provided by an embodiment of the present invention.

[0034] In the figure: 100, bracket; 101, aerosol generator; 102, rectifier grid; 103, first air duct; 104, upstream sampling chamber for particulate matter; 105, air box; 107, downstream sampling chamber for particulate matter; 108, second air duct; 109, fan chamber; 110, first cone surface; 111, second cone surface; 112, third cone surface; 113, fourth cone surface; 201, upper shell; 202, lower shell; 203, upper positioning plate; 2031, return spring; 204, lower positioning plate; 205, rotating shaft; 206, Swivel; 207, knob; 208, filter; 209, rotating column; 2091, thrust bearing; 2092, fixing plate; 210, baffle; 211, handle; 220, threaded rod; 301, upstream wind speed transmitter; 302, upstream micro differential pressure transmitter; 303, upstream particulate matter detector; 304, downstream particulate matter detector; 305, downstream wind speed transmitter; 306, downstream micro differential pressure transmitter; 307, upstream nitrogen oxide detector; 308, downstream nitrogen oxide detector; 309, ozone detector. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Reference Figures 1 to 11 As shown, an embodiment of the present invention provides a full-performance test platform for gas filters in tunnels, comprising a bracket 100, two gas boxes 105, and a detection mechanism arranged between the two gas boxes 105. The gas boxes 105 are arranged on the bracket 100, and the two gas boxes 105 are distributed in the horizontal direction. A first conical surface 110 and a second conical surface 111, both of which have concave surfaces facing the detection mechanism, are provided on one side of each gas box 105 close to the detection mechanism. The axes of the first conical surface 110 and the second conical surface 111 are both arranged vertically, and the two are arranged coaxially, and the first conical surface 110 is on the upper side of the second conical surface 111. From top to bottom, the radius of the first conical surface 110 gradually decreases, and the radius of the second conical surface 111 gradually increases.

[0037] The detection mechanism includes a detection box rotatably mounted on the bracket 100 and a filter 208 located within the detection box. The detection box comprises an upper shell 201 and a lower shell 202, which can move away from or toward each other, with the upper shell 201 positioned above the lower shell 202. Both sides of the upper shell 201 are provided with third tapered surfaces 112, which are designed to abut and be parallel to the first tapered surface 110. Both sides of the lower shell 202 are provided with fourth tapered surfaces 113, which are designed to abut and be parallel to the second tapered surface 111. The sides of the detection box with the third and fourth tapered surfaces 112, 113 are connected to the air box 105. The third and fourth tapered surfaces 112, 113 are located on the same side.

[0038] The detection mechanism has a first state and a second state. In the first state, the first conical surface 110 and the third conical surface 112, and the second conical surface 111 and the fourth conical surface 113 abut against each other, and the detection box and the air box 105 are connected. In the second state, the first conical surface 110 and the third conical surface 112, and the second conical surface 111 and the fourth conical surface 113 are respectively disengaged, and the detection box and the air box 105 are not connected. Move the upper shell 201 and the lower shell 202 away from each other, and then rotate the detection box forward to change the detection mechanism from the first state to the second state, at which point the filter 208 can be removed. Rotate the detection box in the reverse direction, and then move the upper shell 201 and the lower shell 202 closer together, so that the detection mechanism changes from the second state to the first state.

[0039] like Figure 6 and Figure 7 As shown in the viewing angle, the counterclockwise rotation of the detection box is positive rotation, and the clockwise rotation of the detection box is negative rotation.

[0040] In the initial state, the detection mechanism is in the first state, and the detection box is connected to the air box 105. The filter 208 filters the air passing through the detection box.

[0041] To remove the filter 208, the upper and lower shells 201 and 202 are moved away from each other, the first and third conical surfaces 110 and 112, and the second and fourth conical surfaces 111 and 113 are separated. The detection box is then rotated forward to disconnect the detection box and the air box 105. The detection mechanism then transitions from the first state to the second state, exposing the filter 208 and facilitating its removal.

[0042] When the filter 208 needs to be installed, the filter 208 is placed in the detection box. The detection box is rotated in the opposite direction to align the detection box with the two air boxes 105 again, and the upper shell 201 and the lower shell 202 are brought closer to each other. The detection mechanism changes from the second state to the first state, and the first conical surface 110 and the third conical surface 112, and the second conical surface 111 and the fourth conical surface 113 are again against each other.

[0043] The first and third conical surfaces 110, 112, and the second and fourth conical surfaces 111, 113 cooperate to seal the gap between the inspection box and the air box 105, ensuring a tight seal between them. When the upper shell 201 and the lower shell 202 move away from each other, and the first and third conical surfaces 110, 112, and the second and fourth conical surfaces 111, 113 are disengaged, the first, second, third, and fourth conical surfaces 110, 111, 112, and 113 do not interfere with the rotation of the inspection box. Removing or installing the filter 208 by rotating the inspection box is convenient, less prone to damage, improves mounting accuracy, and reduces manufacturing costs.

[0044] In this embodiment, each first conical surface 110 defines a first channel connected to the gas box 105. Each second conical surface 111 defines a second channel connected to the gas box 105. Each third conical surface 112 defines a third channel connected to the detection box, and the third channel is used to communicate with the first channel. Each fourth conical surface 113 defines a fourth channel connected to the detection box, and the fourth channel is used to communicate with the second channel. The third channel and the fourth channel are connected. A first sealing ring is provided on each of the first conical surface 110, the third conical surface 112, the second conical surface 111, and the fourth conical surface 113.

[0045] When the detection mechanism is in the first state, the first and third channels, as well as the second and fourth channels, are connected. When the detection mechanism is in the second state, the first and third channels, as well as the second and fourth channels, are misaligned and no longer connected. At this point, the filter 208 can be removed from the third and fourth channels.

[0046] In this embodiment, along the direction of the positive rotation of the detection box, the four horizontal side surfaces of the detection box are the first side, the second side, the third side, and the fourth side. The first side and the third side are parallel, and both the first side and the third side are provided with a third tapered surface 112 and a fourth tapered surface 113. The second side and the fourth side are parallel, and the second side is located ahead of the fourth side in the positive rotation direction of the detection box.

[0047] A full performance test platform for gas filters in tunnels also includes a clamping mechanism, which is close to the first side of the test box. A first chute is formed on the upper side of the upper shell 201 and passes through the upper shell 201, and a second chute is formed on the lower side of the lower shell 202 and passes through the lower shell 202.

[0048] The clamping mechanism includes an upper positioning plate 203 and a lower positioning plate 204. The upper positioning plate 203 is slidably disposed in a first chute, while the lower positioning plate 204 is slidably disposed in a second chute. The upper and lower positioning plates 203 and 204 are positioned adjacent to each other to clamp the filter 208. The clamping mechanism is located near the first side of the test box, facilitating removal of the filter 208 from the third and fourth channels adjacent to the first side of the test box.

[0049] In this embodiment, the clamping mechanism also includes two return springs 2031, which are disposed within the detection box. One return spring 2031 connects the upper positioning plate 203 and the upper shell 201, and the other return spring 2031 connects the lower positioning plate 204 and the lower shell 202. When the filter 208 is to be installed, the filter 208 is placed between the upper positioning plate 203 and the lower positioning plate 204. Under the action of the return springs 2031, the upper positioning plate 203 and the lower positioning plate 204 approach each other and clamp the filter 208.

[0050] In this embodiment, the detection mechanism further includes multiple connecting assemblies, which are respectively disposed on the second and fourth sides of the detection box. Each connecting assembly includes a rotating shaft 205 and a knob 207. A coaxial rotating ring 206 is fixedly mounted on the knob 207. The axis of the rotating ring 206 is vertically disposed. The rotating ring 206 is rotatable about its own axis on the upper shell 201 and is removable.

[0051] The rotating shaft 205 is arranged horizontally, and the rotating shaft 205 is arranged on the lower shell 202. A threaded rod 220 is fixedly arranged on the rotating shaft 205. The threaded rod 220 is arranged vertically, and the threaded rod 220 and the knob 207 are threadedly matched. The threaded rod 220 is rotatably arranged in the rotating ring 206.

[0052] In this embodiment, the detection mechanism further includes a rotating assembly, which includes a rotating base. The rotating base is disposed on the bracket 100 and is located below the detection box. The rotating base is used to abut against the lower shell 202 and limit the downward movement distance of the lower shell 202.

[0053] Rotating the threaded rod 220 moves the upper shell 201 and lower shell 202 away from each other. Because the third tapered surface 112 of the upper shell 201 abuts the first tapered surface 110, the upper shell 201 cannot move downward. Under the influence of gravity, the lower shell 202 moves downward first. Once the lower shell 202 abuts the rotating base, it stops moving downward. Continuing to rotate the threaded rod 220, the upper shell 201 begins to move upward.

[0054] In this embodiment, the rotating seat includes a fixed plate 2092, a rotating column 209 and a thrust bearing 2091. The fixed plate 2092 is fixedly arranged on the bracket 100. The rotating column 209 is arranged vertically, and the rotating column 209 can be arranged on the fixed plate 2092 so as to rotate around its own axis. The thrust bearing 2091 is arranged on the fixed plate 2092, and the thrust bearing 2091 and the rotating column 209 are coaxially arranged and connected. The upper end of the rotating column 209 is provided with a mounting groove coaxially arranged with the rotating column 209. The lower shell 202 includes a shell and a connecting column. The connecting column and the shell are fixedly connected, and the connecting column is in the middle of the shell. The connecting column and the rotating column 209 are coaxially arranged and can frictionally contact each other, and the mounting groove is used to connect with the connecting column.

[0055] When the lower housing 202 moves until the connecting post is in the mounting groove and contacts the mounting groove, the detection box is rotated forward so that the connecting post is in the mounting groove and in frictional contact with the mounting groove. When the detection box is rotated, the detection box drives the rotating post 209 to rotate relative to the fixed plate 2092.

[0056] In this embodiment, a full-performance test platform for a gas filter in a tunnel further includes a baffle 210, which is fixedly mounted on the bracket 100. When the detection mechanism is in the second state, the baffle 210 is located on the fourth side of the detection box and is adjacent to the first side of the detection box. The baffle 210 is parallel to the gas box 105. When the detection box rotates in the forward direction, the baffle 210 is unobstructed. When the detection box rotates in the reverse direction, the baffle 210 is used to limit the reverse rotation position of the detection box, allowing the detection box to be arranged parallel to the gas box 105.

[0057] In this embodiment, a handle 211 is fixedly provided on the second side of the detection box.

[0058] In this embodiment, a full-performance test platform for a gas filter in a tunnel also includes an aerosol generator 101, a rectifier grid 102, a first air duct 103, an upstream particulate sampling chamber 104, a downstream particulate sampling chamber 107, a second air duct 108, and a fan chamber 109. The first air duct 103, the upstream particulate sampling chamber 104, an air box 105, a detection box, another air box 105, the downstream particulate sampling chamber 107, the second air duct 108, and the fan chamber 109 are sequentially connected. A fan is housed within the fan chamber 109, which provides suction and airflow from one air box 105 to the other, maintaining a negative pressure throughout the test and preventing the escape of contaminated gases.

[0059] Specifically, sampling tubes for NOx, wind speed, and air pressure are installed in the first air duct 103, each connected to a corresponding instrument. An upstream particulate matter detector 303 and a downstream particulate matter detector 304 are installed upstream and downstream of the detection box, respectively. The upstream particulate matter sampling chamber 104 is equipped with a sampling tube that detects the upstream particulate matter concentration via the upstream particulate matter detector 303. The downstream particulate matter sampling chamber 107 is equipped with a sampling tube that detects the downstream particulate matter concentration via the downstream particulate matter detector 304. The second air duct 108 is equipped with sampling tubes for NOx, wind speed, and air pressure, each connected to a corresponding instrument.

[0060] An upstream wind speed transmitter 301 and an upstream differential pressure transmitter 302 are installed upstream of the test box. A downstream wind speed transmitter 305 and a downstream differential pressure transmitter 306 are installed downstream of the test box. These transmitters measure wind speed and calculate the corresponding air volume using a wind arithmetic (Q = v * A, where air volume = wind speed × windward area). This determines the test box's operating wind speed and volume in preparation for subsequent testing.

[0061] Pollution sources include nitrogen oxides, particulate matter (PM 10 / PM 2.5 ) Nitrogen oxides are nitrogen dioxide gas standard substances in nitrogen. The gas source is filled in a gas cylinder. The gas cylinder is stored in a gas cylinder cabinet when the oxide generator is stored. The nitrogen oxide gas enters the upstream of the detection box through the ventilation pipe. Particulate pollutants (PM 10 / PM 2.5 Aerosol generator 101 generates aerosol particles with a specific concentration and size distribution, simulating the particle distribution in an actual working environment. An upstream nitrogen oxide detector 307 and a downstream nitrogen oxide detector 308 are placed upstream and downstream of the detection box, respectively. An air pump draws air from the detection box for monitoring.

[0062] Pressure transmitters are installed upstream and downstream of the test box to monitor the air pressure upstream and downstream of the test box in real time. Particle detectors are installed upstream and downstream of the test box, and the air flowing in the test box is extracted by an air pump for monitoring. An ozone detector 309 is installed downstream of the test box, and the air flowing in the test box is extracted by an air pump for monitoring. The fan, upstream wind speed transmitter 301, upstream micro-pressure differential transmitter 302, downstream wind speed transmitter 305, and downstream micro-pressure differential transmitter 306 are all controlled by a PLC control system, and their monitoring data will be saved in the computer at a rate of 1 second per piece. The upstream nitrogen oxide detector 307, downstream nitrogen oxide detector 308, and ozone detector 309 can read and save data automatically after being turned on. The upstream particle detector 303 and downstream particle detector 304 are equipped with data reading software, which can read and save data automatically.

[0063] Working process: In the initial state, the detection mechanism is in the first state, and the detection box is connected to the air box 105. The upper positioning plate 203 and the lower positioning plate 204 clamp the filter 208.

[0064] The fan is started, and the gas passes through the aerosol generator 101, the rectifying grid 102, the first air duct 103, the upstream particulate matter sampling chamber 104, an air box 105, a detection box, another air box 105, the downstream particulate matter sampling chamber 107, the second air duct 108, and the fan chamber 109. After reaching the fan chamber 109, the gas is discharged into the air.

[0065] The gas is rectified by the rectifier grid 102, making the incoming air more stable. When passing through the first air duct 103, the upstream nitrogen oxide detector 307, the upstream wind speed transmitter 301, and the upstream micro-pressure differential transmitter 302 detect the NOx, wind speed, and wind pressure in the airflow. When passing through the upstream particulate matter sampling chamber 104, the upstream particulate matter detector 303 will perform PM on the upstream airflow. 10 / PM 2.5 The gas flows through the air box 105 and reaches the filter 208, which filters the gas. The downstream particulate matter detector 304 set at the downstream particulate matter sampling chamber 107 and the downstream nitrogen oxide detector 308 and ozone detector 309 set at the second air duct 108 detect the PM in the gas after passing through the filter 208. 10 / PM 2.5 , NOx, and ozone concentrations to calculate purification efficiency and ozone production. Downstream wind speed transmitter 305 and downstream differential pressure transmitter 306 detect wind speed and pressure after filter 208 to calculate resistance. After the test, the saved data is organized according to a calculation formula, and the test results are used to determine the functional relationship between wind speed, purification efficiency, and resistance.

[0066] A full performance test platform for gas filters in tunnels can test dust collectors of different specifications and functions at different wind speeds and volumes. The test items include particulate matter (PM 10 / PM 2.5 ) purification efficiency, nitrogen oxide purification efficiency, ozone concentration and resistance, through test and detection to ensure product quality and promote new product development.

[0067] When the filter 208 needs to be disassembled, the threaded rod 220 is rotated to move the upper shell 201 and the lower shell 202 away from each other. Since the third conical surface 112 of the upper shell 201 and the first conical surface 110 are in contact with each other, the upper shell 201 cannot move downward. The lower shell 202 first moves downward under the action of gravity. When the lower shell 202 moves until the connecting column is in the installation groove and is in contact with the installation groove, the lower shell 202 stops moving. At this time, the fourth conical surface 113 of the lower shell 202 and the second conical surface 111 are disengaged. After the lower shell 202 stops moving, the threaded rod 220 is continued to be rotated, and the upper shell 201 begins to move upward, and the third conical surface 112 and the first conical surface 110 gradually separate.

[0068] After the first and third conical surfaces 110, 112, and the second and fourth conical surfaces 111, 113 are separated, grip the handle 211 and rotate the inspection box forward. The connecting column is positioned within the mounting groove and in frictional contact with the mounting groove. When the inspection box is rotated forward, it drives the rotating column 209 to rotate relative to the fixed plate 2092.

[0069] During the forward rotation of the detection box, the third channel gradually loses communication with the first channel, the fourth channel, and the second channel, respectively. At this point, the detection mechanism is in the second state. By moving the upper positioning plate 203 upward and the lower positioning plate 204 downward, the upper and lower positioning plates 203 and 204 release the filter 208, allowing the filter 208 to be removed from the third and fourth channels near the first side of the detection box.

[0070] When the filter 208 needs to be installed, the filter 208 is placed between the upper positioning plate 203 and the lower positioning plate 204. Under the action of the return spring 2031, the upper positioning plate 203 and the lower positioning plate 204 approach each other and clamp the filter 208.

[0071] Rotate the test box in the opposite direction. When the test box and baffle 210 abut against each other, the test box stops rotating. Now the test box and gas box 105 are facing each other. Rotate the threaded rod 220 to bring the upper shell 201 and lower shell 202 closer together. This will ensure that the first conical surface 110 and the third conical surface 112, as well as the second conical surface 111 and the fourth conical surface 113, completely overlap before continuing the test.

[0072] The existing filter 208 installation chamber and the pre-chamber require installation of slide rails, which are easily damaged. In the present invention, the filter 208 is removed or installed by rotating the detection box, which is easy to operate, not easy to damage, improves the fixing accuracy, and reduces the manufacturing cost.

[0073] The first tapered surface 110 and the third tapered surface 112, and the second tapered surface 111 and the fourth tapered surface 113, cooperate to seal the gap between the detection box and the gas box 105, thereby ensuring a tight seal between the two. When the upper shell 201 and the lower shell 202 move away from each other, and the first tapered surface 110 and the third tapered surface 112, and the second tapered surface 111 and the fourth tapered surface 113 are respectively disengaged, the first tapered surface 110, the second tapered surface 111, the third tapered surface 112, and the fourth tapered surface 113 will not interfere with the rotation of the detection box.

[0074] At the same time, when the detection box is in the second state, the air box 105 is exposed, which is convenient for maintenance of the air box 105. When removing or installing the filter 208, it is only necessary to put the filter 208 in, and the upper positioning plate 203 and the lower positioning plate 204 can automatically clamp the filter 208, making the operation more convenient.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A full performance test platform for gas filters in tunnels, characterized by: The device comprises a bracket, a clamping mechanism, two air boxes, and a detection mechanism disposed between the two air boxes; the air boxes are disposed on the bracket and are horizontally distributed; a first conical surface and a second conical surface are disposed on a side of each air box close to the detection mechanism, both concave surfaces facing the detection mechanism; the first conical surface is located above the second conical surface; and from top to bottom, the radius of the first conical surface gradually decreases, while the radius of the second conical surface gradually increases. The detection mechanism includes a detection box rotatably mounted on a bracket and a filter within the detection box; the detection box includes an upper shell and a lower shell that can move away from or approach each other; both sides of the upper shell are provided with a third conical surface for abutting against and parallel to the first conical surface, and both sides of the lower shell are provided with a fourth conical surface for abutting against and parallel to the second conical surface; both sides of the detection box provided with the third and fourth conical surfaces are connected to the air box; The detection mechanism has a first state and a second state. In the first state, the first conical surface and the third conical surface, and the second conical surface and the fourth conical surface are in contact with each other, and the detection box and the air box are connected. In the second state, the first conical surface and the third conical surface, and the second conical surface and the fourth conical surface are out of contact, and the detection box and the air box are not connected. By moving the upper shell and the lower shell away from each other and then rotating the detection box forward, the detection mechanism changes from the first state to the second state, and the filter can be removed. The clamping mechanism includes an upper positioning plate and a lower positioning plate; the upper positioning plate is slidably arranged on the upper shell, and the lower positioning plate is slidably arranged on the lower shell; the upper positioning plate and the lower positioning plate are close to each other to clamp the filter; The clamping mechanism also includes two return springs, one return spring connecting the upper positioning plate and the upper shell, and the other return spring connecting the lower positioning plate and the lower shell.

2. A full performance test platform for gas filters in tunnels according to claim 1, characterized in that: A first channel connected to the gas box is provided on each first conical surface; a second channel connected to the gas box is provided on each second conical surface; a third channel connected to the detection box is provided on each third conical surface, and the third channel is used to connect to the first channel to allow gas to pass through; a fourth channel connected to the detection box is provided on each fourth conical surface, and the fourth channel is used to connect to the second channel to allow gas to pass through.

3. The full performance test platform for gas filters in tunnels according to claim 1 is characterized by: The detection mechanism also includes a plurality of connecting components, which are sequentially distributed along the circumference of the detection box. Each connecting component includes a rotating shaft and a knob. The axis of the knob is vertically arranged, and the knob can rotate around its own axis on the upper shell. The rotating shaft is arranged on the lower shell, and a threaded rod is fixedly arranged on the rotating shaft; the threaded rod is arranged vertically, and the threaded rod and the knob are matched with each other. When the knob is rotated, the upper shell and the lower shell can move away from or closer to each other.

4. The full performance test platform for gas filters in tunnels according to claim 1, characterized in that: The detection mechanism also includes a rotating assembly, which includes a rotating seat; the rotating seat is arranged on the bracket and is located below the detection box; the rotating seat is used to abut against the lower shell and limit the downward movement distance of the lower shell.

5. The full performance test platform for gas filters in tunnels according to claim 4, characterized in that: The rotating seat includes a fixed plate and a rotating column; the fixed plate is fixedly arranged on the bracket; the rotating column is vertically arranged, and the rotating column is rotatably arranged around its own axis on the fixed plate; the lower shell includes a shell and a connecting column; the connecting column and the shell are fixedly connected, and the connecting column is located in the middle of the shell, the connecting column and the rotating column are coaxially arranged and can rub against each other, and when the detection box rotates, it rotates with the connecting column as the center of rotation.

6. The full performance test platform for gas filters in tunnels according to claim 1 is characterized by: It also includes a baffle, which is fixed on the bracket and is used to limit the position of the reverse rotation of the detection box so that the detection box can be parallel and aligned with the air box.

7. The full performance test platform for gas filters in tunnels according to claim 1, characterized in that: A handle is fixedly arranged on the detection box.

8. The full performance test platform for gas filters in tunnels according to claim 1 is characterized by: It also includes an aerosol generator, a particulate matter detector, a nitrogen oxide generator, a micro-pressure differential transmitter, a wind speed transmitter, a nitrogen oxide detector, an ozone detector, a rectifier grid, a first air duct, an upstream particulate matter sampling chamber, a downstream particulate matter sampling chamber, a second air duct and a fan chamber; the first air duct, the upstream particulate matter sampling chamber, an air box, a detection box, another air box, the downstream particulate matter sampling chamber, the second air duct and the fan chamber are connected in sequence; a fan is provided in the fan chamber, which has a suction function and provides an airflow flowing from one air box to another.

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