An ambient air ozone measurement and control detection device and method

Abstract

The present application relates to the field of environmental air detection, and discloses an environmental air ozone detection device and method, which comprises a mounting frame, a detection device and a traction device mounted on the mounting frame, the traction device comprising two groups of air tanks, a vacuum pump and a switching mechanism, one air tank flows air samples in the detection device through vacuum negative pressure mode, the other air tank is vacuumized, the switching mechanism is used for changing the state of the two air tanks at the same time, so that the detection process does not need to be interrupted, and the switching speed of the two air tanks is fast, that is, instantaneous switching, so that the switching action will not cause the fluctuation of air samples, in addition, since it is a vacuum negative pressure traction mode, the air samples can flow along the extension direction of the detection device during the flow process in the detection device, and the disorder fluctuation of the air samples is reduced as much as possible, thereby improving the accuracy of the detection result.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of environmental air detection, in particular to an environmental air ozone measurement and control detection device and method. BACKGROUND

[0002] The ultraviolet light absorption method is the most commonly used method for detecting ozone concentration. Generally, air is pumped through a detection unit (generally referred to as a pipeline), and an ultraviolet lamp and a light detector are arranged on both sides of the detection unit. The ultraviolet lamp emits ultraviolet light, which is received by the light detector after passing through the detection unit. The simplest light detector is a photodiode, which generates an electric current when the ultraviolet light strikes it. The electric current can be detected by a galvanometer. Since the ozone molecules absorb or block the ultraviolet light from reaching the light detector when the ultraviolet light passes through the detection unit, the presence of ozone molecules in the air sample can be determined by detecting the air sample without ozone and the air sample to be detected. The concentration of ozone molecules in the air sample can be calculated based on the difference between the two sets of data. However, the existing ultraviolet light absorption method has some shortcomings: 1. The ultraviolet light absorption method is based on the fact that ozone molecules absorb or block ultraviolet light from reaching the light detector. When the air sample to be detected flows in the detection unit, if the air sample has fluctuations such as vortex flow and turbulent flow in addition to flowing along the extension direction of the detection unit, the fluctuations will cause the ozone molecules to move in other random fluctuations in addition to moving along the extension direction of the detection unit. Since the ultraviolet light is emitted in a straight line, these random fluctuations will cause the same ozone molecule to intersect with the same ultraviolet light multiple times, that is, the ultraviolet light is absorbed or blocked by the same ozone molecule multiple times, which greatly reduces the accuracy of the detection result; 2. Whether it is a pump or a blower, the process of pulling the air flow will cause the air sample to have fluctuations such as vortex flow and turbulent flow. Specifically, when the blower and the vane pump are running, the rotation of the internal blades will inevitably cause the air to disperse, that is, in addition to flowing along a straight line, there is also a dispersed flow, that is, fluctuations. When the positive displacement pump is running, there is a jerk, which also causes air fluctuations. In summary, the accuracy of the test structure of the ultraviolet light absorption method needs to be improved.

[0003] Therefore, the present application provides an environmental air ozone measurement and control detection device and method. SUMMARY

[0004] To solve the problems mentioned in the background, the present application provides an environmental air ozone measurement and control detection device and method.

[0005] To achieve the above technical purposes, the technical solutions adopted by the present application are as follows.

[0006] The utility model provides an environmental air ozone measurement and control detection device, which comprises a mounting frame, a detection device and a traction device mounted on the mounting frame, the traction device is used for continuously flowing air samples in the detection device through a vacuum negative pressure traction mode, and the detection device is used for detecting the ozone concentration of the air samples through an ultraviolet light absorption method.

[0007] Further, the detection device comprises a detection unit and an ozone removal unit mounted on the mounting frame, the input end of the detection unit is provided with an input pipe, the output end is provided with an output pipe, the input end of the ozone removal unit is in communication with the input pipe through a side pipe one, the output end is in communication with the input pipe through a side pipe two, the communication position of the side pipe two and the input pipe is located downstream of the communication position of the side pipe one and the input pipe, a valve one is arranged on the side pipe two, and a valve two is arranged on the input pipe and located between the communication position of the side pipe two and the input pipe and the communication position of the side pipe one and the input pipe.

[0008] Further, the detection unit comprises two groups of connectors, the connector comprises a main connector body, one end of the main connector body is closed, one end is open and in communication with the input pipe or the output pipe, the outer circumferential surface of the main connector body extends radially and is provided with an outer connector nozzle, the free end of the outer connector nozzle is provided with a branch ring, the branch ring comprises an inner ring and an outer ring parallel to the main connector body, the outer ring is in the shape of a hollow circular ring, the inner ring is in the shape of a hollow cylinder, the outer ring and the inner ring are in communication through an inner connector nozzle, the outer ring is in communication with the outer connector nozzle, both end faces of the inner ring in the axial direction are provided with mounting holes, and mounting pipes extend from the opposite orifices of the two mounting holes; among the two groups of connectors, a detection pipe is arranged between the two mounting pipes arranged oppositely, an ultraviolet light generator is arranged in one of the two mounting pipes arranged oppositely, and a light detector is arranged in the other mounting pipe; pipe covers are matched and mounted at the pipe openings of the two mounting pipes arranged oppositely.

[0009] Further, the traction device comprises two groups of gas tanks and two groups of vacuum pumps, a switching mechanism is arranged between the gas tanks, the vacuum pumps and the output pipe, the switching mechanism is used for changing the states of the two gas tanks at the same time, in the initial state, one gas tank flows the air samples in the detection device through a vacuum negative pressure mode, and the other gas tank is vacuumized.

[0010] The air inlet end of the vacuum pump is provided with a suction pipe, the upper end of the gas tank is provided with a connecting pipe one, and the lower end is provided with a connecting pipe two, and the switching mechanism is arranged between the output pipe, the suction pipe, the connecting pipe one and the connecting pipe two.

[0011] Further, the switching mechanism comprises a main valve body, both ends of the main valve body are open and matched with side valve covers, one side of the two groups of side valve covers extends a side valve body, both ends of the side valve body are open, the inner wall of the main valve body is coaxially provided with a ring groove, the cross section of the ring groove is in the shape of an arc, the ring groove is provided with two groups along the axial direction of the main valve body, and the main valve body is further provided with a damping unit and a switching shaft.

[0012] The damping unit comprises a mounting body coaxially sleeved in the main valve body, an end face of the mounting body is provided with a fixing hole and an intermediate hole, two orifices of the fixing hole are coaxially extended with a switching shaft, the switching shaft extends into the side valve body, the outer circular surface of the mounting body is provided with a damping groove in the radial direction, and a damping component is arranged in the damping groove;

[0013] Two limiting rings two are coaxially fixed in the main valve body, the two limiting rings two are provided with two groups of ring grooves located between the two groups of limiting rings two, and when the damping unit contacts the limiting ring two, the damping unit is located at the position of the ring groove close to the limiting ring two.

[0014] Further, the damping component comprises a damping body sleeved in the damping groove, a spring two is arranged between the damping body and the groove bottom of the damping groove, one end of the damping body is in a spherical shape, and in the initial state, the mounting body is located at any position of the ring groove, and the spherical surface of the damping body is attached to the groove wall of the ring groove.

[0015] Further, the main valve body further sleeves a piston, the piston is provided with two groups and is located on both sides of the damping unit, the outer part of the switching shaft is fixed with a fixed body, the fixed body is located on the side of the piston away from the damping unit, and a spring one is arranged between the fixed body and the piston;

[0016] The main valve body further coaxially fixes a limiting ring one, the limiting ring one is located on the side of the piston away from the damping unit, and the outer surface of the main valve body is provided with a connecting hole close to the side valve cover;

[0017] The fixed body, the spring one, the limiting ring one and the connecting hole are correspondingly provided with two groups, and the two groups of connecting holes are respectively communicated with two groups of connecting pipes one;

[0018] The outer part of the main valve body is provided with an air hole, and the air hole is located between the two groups of pistons.

[0019] Further, each group of side valve bodies is provided with a valve core, the valve core is connected with the switching shaft, the outer surface of the side valve body is provided with a valve hole one, a valve hole two, a valve hole three and a valve hole four, the valve hole one and the valve hole two are located on the same side of the side valve body, the valve hole three and the valve hole four are located on the same side of the side valve body, the valve hole one and the valve hole three are respectively located on both sides of the side valve body, the valve hole one and the valve hole three are located on the same straight line, the valve hole two and the valve hole four are located on the same straight line, the outer circular surface of the valve core is provided with a valve groove in an annular shape, when the valve groove is communicated with the valve hole one and the valve hole three, the side valve body is in a communication state one, when the valve groove is communicated with the valve hole two and the valve hole four, the side valve body is in a communication state two, and the states of the two groups of side valve bodies are always opposite.

[0020] Further, the valve holes three on the two groups of side valve bodies are communicated through the intermediate pipe, the two groups of suction pipes are communicated with the intermediate pipe, the output pipe comprises a main pipe one communicated with the detection unit, the main pipe one extends two groups of branch pipes one at the end, the two groups of branch pipes one are communicated with the valve holes four on the two groups of side valve bodies respectively, the connecting pipe two comprises a main pipe two communicated with the valve hole two, and the main pipe two is communicated with the valve hole one through the branch pipe two.

[0021] A detection method of an environmental air ozone measurement and control detection device:

[0022] Step one: in the initial state, a group of side valve bodies are in the communication state two, and the corresponding gas tank is in the vacuum negative pressure state, at this time: under the action of the vacuum negative pressure, the air sample sequentially passes through the input pipe, the detection unit, the output pipe, the valve hole four and the valve groove in the side valve body in the communication state two, and the valve hole two and the connecting pipe two into the gas tank, that is, the air sample is dragged to flow in the detection device through the gas tank in the vacuum negative pressure state, and the air sample is detected by the detection device.

[0023] The other group of side valve bodies are in the communication state one, and the corresponding gas tank is vacuumed, at this time: the air in the gas tank is sequentially extracted and discharged by the vacuum pump through the connecting pipe two, the valve hole one and the valve groove in the side valve body in the communication state one, and the valve hole three, the intermediate pipe and the suction pipe;

[0024] Step two: in step one, during the vacuuming process of the gas tank by the vacuum pump, the area between the piston and the side valve cover is also vacuumed because it is communicated with the connecting hole, the connecting pipe one and the gas tank, under the action of the negative pressure, the piston moves close to the side valve cover, during the movement of the piston:

[0025] Firstly, because of the existence of the damping unit, the switching shaft is stationary, and the spring one is compressed, when the compression amount of the spring one reaches the maximum, the piston continues to move to overcome the damping of the damping unit, and the spring one releases the elastic force to drive the fixed body and the switching shaft to move, the movement of the switching shaft drives the damping unit to move into another ring groove, and the movement of the switching shaft also drives the valve core to move, so that the state of the two groups of side valve bodies is switched, and then the gas tank that drags the air sample to flow starts to be vacuumed, and the gas tank that is vacuumed starts to drag the air sample to flow, so that the air sample continuously flows in the detection device until the detection is completed.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] In the present application, the traction device draws the air sample in the detection device by the vacuum negative pressure traction mode. During the flowing process, the air sample can flow smoothly along the extension direction of the detection device, and the disorder fluctuation of the air sample is reduced as much as possible. The air sample flows approximately in a straight line in the detection device. In this way, the same ozone molecule in the air sample only intersects with the ultraviolet light once, thereby improving the accuracy of the detection result.

[0028] Further, in the traction device, two gas tanks are arranged. One gas tank is vacuumed by the vacuum pump, and the other gas tank draws the air sample in the detection device. After the preset time, the switching mechanism changes the state of the two gas tanks. In this way, the detection process does not need to be interrupted, and the switching speed of the switching mechanism for changing the state of the two gas tanks is fast, which is instantaneous switching. The switching action does not cause air fluctuation when the air sample flows, thereby improving the accuracy of the detection result.

[0029] In the present application, the ultraviolet generator and the light detector are located in the installation pipe. The installation pipe is coaxial with the detection pipe. Therefore, the ultraviolet light between the ultraviolet generator and the light detector has no obstacle except the air sample, thereby further improving the accuracy of the detection result. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present application.

[0031] Figure 2 It is an internal schematic diagram of the present application. Figure 1 ;

[0032] Figure 3 It is an internal schematic diagram of the present application. Figure 2 ;

[0033] Figure 4 It is a schematic diagram of the detection device.

[0034] Figure 5 It is a schematic diagram of the detection unit.

[0035] Figure 6 It is a schematic diagram of the joint.

[0036] Figure 7 It is a schematic diagram of the traction device. Figure 1 ;

[0037] Figure 8 It is a schematic diagram of the traction device. Figure 2 ;

[0038] Figure 9 It is a sectional view of the switching mechanism.

[0039] Figure 10 It is a sectional view of the main valve body.

[0040] Figure 11 is a sectional view of a damping unit;

[0041] Figure 12 is a sectional view of a side valve body;

[0042] Figure 13 is a schematic view of an adjusting component.

[0043] Reference signs in the drawings are:

[0044] 100, outer housing;

[0045] 200, detection device; 201, input pipe; 202, detection unit; 2021, detection pipe; 2022, joint; 2022a, main joint body; 2022b, branch joint ring; 2023, ultraviolet light generator; 2024, light detector; 203, output pipe; 204, ozone removal unit; 2041, side pipe one; 2042, side pipe two;

[0046] 300, traction device; 301, gas tank; 3011, pressure gauge; 302, vacuum pump; 303, suction pipe; 304, connecting pipe one; 305, connecting pipe two; 306, adjusting component; 3061, cylinder body; 3062, cylinder plug; 3063, adjusting pipe; 3064, telescopic rod; 307, switching mechanism; 308, main valve body; 309, piston; 310, fixed body; 311, spring one; 312, limiting ring one; 313, connecting hole; 314, ring groove; 315, air hole; 316, limiting ring two; 317, mounting body; 318, switching shaft; 319, intermediate hole; 320, damping groove; 321, sliding plug; 322, damping body; 323, spring two; 324, communication hole; 325, side valve cover; 326, side valve body; 327, valve hole one; 328, valve hole two; 329, valve hole three; 330, valve hole four; 331, valve core. DETAILED DESCRIPTION

[0047] To further illustrate the technical means and effects taken by the present application to achieve the predetermined object, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0048] As Figures 1-13As shown, an ambient air ozone monitoring and control device includes a housing 100, within which a mounting frame is installed. A detection device 200 and a traction device 300 are mounted on the mounting frame. The traction device 300 is used to traction an air sample within the detection device 200 using a vacuum negative pressure traction method. Because it is a vacuum negative pressure traction method, the air sample flows smoothly along the extension direction of the detection device 200 during its flow, minimizing disorderly fluctuations and thus improving the accuracy of the detection results. The detection device 200 is used to detect the ozone concentration of the air sample using ultraviolet light absorption.

[0049] Detection device 200:

[0050] like Figure 4 As shown, the detection device 200 includes a detection unit 202 mounted on a mounting frame. The input end of the detection unit 202 is provided with an input tube 201 for receiving air samples, and the output end of the detection unit 202 is provided with an output tube 203 for communicating with the traction device 300.

[0051] The detection device 200 also includes an ozone removal unit 204 mounted on a mounting bracket for removing ozone from the air. This is a technology that can be implemented in the prior art and will not be described in detail. The input end of the ozone removal unit 204 is connected to the input pipe 201 through a side pipe 1 2041, and the output end of the ozone removal unit 204 is connected to the input pipe 201 through a side pipe 2 2042. The connection point between the side pipe 2 2042 and the input pipe 201 is located downstream of the connection point between the side pipe 1 2041 and the input pipe 201. Here, downstream is set with reference to the flow direction of the air sample in the input pipe 201.

[0052] A valve is installed on the second side pipe 2042, and a valve is installed on the input pipe 201. The valve is located between the connection between the second side pipe 2042 and the input pipe 201, and between the connection between the first side pipe 2041 and the input pipe 201.

[0053] When valve one is closed and valve two is open, the air sample enters the detection unit 202 through the input pipe 201. When valve one is open and valve two is closed, ordinary outside air enters the ozone removal unit 204 through the input pipe 201 and side pipe one 2041. After ozone molecules are removed, the air enters the detection unit 202 through side pipe two 2042 and the input pipe 201. By detecting the air sample and the ozone-free air, two sets of detection data are obtained. Based on these two sets of detection data, it is determined whether the air sample contains ozone molecules, and the concentration of ozone molecules in the air sample is calculated based on the difference between the two sets of data.

[0054] Furthermore, such as Figure 5 and Figure 6As shown, the detection unit 202 includes two groups of connectors 2022, the connector 2022 includes a main body 2022a, one end of the main body 2022a is closed, one end is open and communicates with the input pipe 201 or the output pipe 203, and the outer circular surface of the main body 2022a extends radially to have an outer nozzle, which is arranged in the circumferential direction of the main body 2022a. In the embodiment, three groups are arranged, and the free end of each group of outer nozzles is provided with a group of branch rings 2022b, the branch ring 2022b includes an inner ring and an outer ring, and the outer ring and the inner ring are communicated by an inner nozzle and the inner nozzle is arranged in the circumferential direction of the inner ring. There are several, and the outer ring communicates with the outer nozzle.

[0055] The outer ring is a hollow circular ring, the inner ring is a hollow cylindrical shape, the inner and outer rings are coaxial, the outer ring is parallel to the main body 2022a, and the inner ring is provided with a mounting hole on the two end faces in the axial direction. The two mounting holes extend in opposite directions.

[0056] Among the two groups of connectors 2022, the mounting pipes arranged in opposite directions are provided with a detection pipe 2021, among the mounting pipes arranged in opposite directions, one mounting pipe is provided with an ultraviolet generator 2023, and the other mounting pipe is provided with a light detector 2024. In addition, the pipe openings of the mounting pipes arranged in opposite directions are matched with pipe covers.

[0057] The significance is that a plurality of data can be obtained by one detection, thereby improving the accuracy of the detection result and the efficiency of the detection process. In addition, since the mounting pipe and the detection pipe 2021 are coaxial, the ultraviolet generator 2023 and the light detector 2024 are equivalent to being located in the detection pipe 2021, and the ultraviolet rays between the ultraviolet generator 2023 and the light detector 2024 do not pass through any obstacles except the air sample, thereby further improving the accuracy of the detection result.

[0058] The traction device 300:

[0059] As shown in the figure, Figures 7-13 The traction device 300 includes a gas tank 301 and a vacuum pump 302, the gas tank 301 is provided with a pressure gauge 3011, the gas tank 301 is vacuumized by the vacuum pump 302, the output pipe 203 is sucked by the gas tank 301 in a nearly vacuum state, so that the air sample flows smoothly in the detection device 200 under the action of negative pressure, and the flow process is less fluctuated, nearly no, thereby improving the accuracy of the detection result.

[0060] Furthermore, when the air sample is drawn through the near-vacuum gas tank 301 within the detection device 200, the vacuum pump 302 cannot evacuate the gas tank 301 to avoid fluctuations in the air sample. Therefore, the gas tank 301 needs to be evacuated beforehand. However, during use, air samples continuously enter the gas tank 301 through the output pipe 203, causing the pressure inside the gas tank 301 to increase. Consequently, when the pressure inside the gas tank 301 reaches a preset value, the detection process needs to be stopped, and the gas tank 301 needs to be evacuated again, which is quite cumbersome. To address the impact on detection efficiency, two sets of gas cylinders 301 and two sets of vacuum pumps 302 are provided. A switching mechanism 307 is provided between the two sets of gas cylinders 301, the two sets of vacuum pumps 302, and the output pipe 203. The switching mechanism 307 is used to reverse the state of the two gas cylinders 301, that is, one gas cylinder 301 is evacuated by the vacuum pump 302, and the other gas cylinder 301 pulls the air sample to flow in the detection device 200. This alternation ensures that the detection process does not need to be interrupted, and the switching speed of the two gas cylinders 301 is fast, which is an instantaneous switching, so that the switching action will not cause fluctuations in the air sample.

[0061] Specifically:

[0062] like Figure 8 As shown, the vacuum pump 302 has a suction pipe 303 at its inlet end, and the gas tank 301 has a connecting pipe 304 at its upper end and a connecting pipe 305 at its lower end.

[0063] The switching mechanism 307 is located between the output tube 203, the suction tube 303, the first connecting tube 304, and the second connecting tube 305.

[0064] like Figures 9-12 As shown, the switching mechanism 307 includes a main valve body 308, which has openings at both ends and is fitted with side valve covers 325 at both openings. A side valve body 326 extends from the opposite side of the two sets of side valve covers 325, and the side valve body 326 has openings at both ends.

[0065] like Figures 9-12 As shown, an annular groove 314 is coaxially provided on the inner wall of the main valve body 308. The cross-section of the annular groove 314 is arc-shaped. Two sets of annular grooves 314 are provided along the axial direction of the main valve body 308. A damping unit and a switching shaft 318 are also provided inside the main valve body 308.

[0066] The damping unit includes a mounting body 317 coaxially sleeved in the main valve body 308. A fixing hole is coaxially opened through the end face of the mounting body 317. A switching shaft 318 extends coaxially from both openings of the fixing hole. The end of the switching shaft 318 extends into the side valve body 326 through the side valve cover 325.

[0067] A damping groove 320 is radially arranged on the outer circular surface of the mounting body 317. A damping body 322 is sleeved inside the damping groove 320. A second spring 323 is arranged between the damping body 322 and the bottom of the damping groove 320. The end of the damping body 322 away from the second spring 323 is spherical. In the initial state, the mounting body 317 is located at any position of the annular groove 314 and the spherical surface of the damping body 322 is in contact with the groove wall of the annular groove 314. The frictional force generated by the surface contact between the damping body 322 and the annular groove 314 prevents the movement of the mounting body 317, thereby preventing the movement of the switching shaft 318. Preferably, a plurality of damping grooves 320 are arranged in an array along the circumferential direction of the mounting body 317.

[0068] Furthermore, the end face of the mounting body 317 is provided with a central hole 319, which is used to connect the left and right sides of the mounting body 317 during the movement of the mounting body 317, so as to avoid the movement being interfered with by air pressure.

[0069] Furthermore, the switching action of the switching mechanism 307 is driven by the movement of the switching shaft 318, as will be explained later. The movement of the switching shaft 318 moves the damping unit together with it. In order to prevent the switching shaft 318 and the damping unit from moving excessively, a second limit ring 316 is also coaxially fixed inside the main valve body 308. The second limit ring 316 is provided with two sets, and the two sets of annular grooves 314 are located between the two sets of the second limit ring 316. When the damping unit contacts the second limit ring 316, the damping unit is located at the position of the annular groove 314 close to the second limit ring 316.

[0070] like Figures 8-10 As shown, a piston 309 is also fitted inside the main valve body 308. Two sets of pistons 309 are provided and are located on both sides of the damping unit. The piston 309 is in the shape of an annular ring, and its inner ring is used to avoid the switching shaft 318.

[0071] A fixing body 310 is fixed to the outside of the switching shaft 318. The fixing body 310 is located on the side of the piston 309 away from the damping unit. A spring 311 is sleeved on the outside of the switching shaft 318 between the fixing body 310 and the piston 309.

[0072] A limit ring 312 is also coaxially fixed inside the main valve body 308. The limit ring 312 is located on the side of the piston 309 away from the damping unit. The limit ring 312 is used to limit the piston 309 from continuing to move after the piston 309 has moved the maximum distance, which is the same as the function of the limit ring 316.

[0073] The outer surface of the main valve body 308 is also provided with a connection hole 313, which is close to the side valve cover 325.

[0074] The aforementioned fixing body 310, spring 311, limiting ring 312, and connecting hole 313 are each provided in two sets. Additionally, as... Figure 8As shown, the two groups of connecting holes 313 are respectively communicated with the two groups of connecting pipes one 304.

[0075] As shown in FIG. 1, the detection device 200 comprises a detection unit 202 and an output pipe 203. Figure 8 , Figure 9 and Figure 12 As shown, each group of side valve bodies 326 is provided with a valve core 331, the valve core 331 is connected with a switching shaft 318, and the switching shaft 318 moves with the valve core 331.

[0076] The outer surface of the side valve body 326 is provided with valve holes, which are four groups and are respectively valve hole one 327, valve hole two 328, valve hole three 329 and valve hole four 330. Among them, the valve hole one 327 and the valve hole two 328 are located on the same side of the side valve body 326, the valve hole three 329 and the valve hole four 330 are located on the same side of the side valve body 326, the valve hole one 327 and the valve hole three 329 are respectively located on both sides of the side valve body 326, the valve hole one 327 and the valve hole three 329 are located on the same straight line, and the valve hole two 328 and the valve hole four 330 are located on the same straight line.

[0077] The outer circular surface of the valve core 331 is provided with a valve groove in the shape of a ring. When the valve groove is communicated with the valve hole one 327 and the valve hole three 329, the side valve body 326 is in a communication state one. When the valve groove is communicated with the valve hole two 328 and the valve hole four 330, the side valve body 326 is in a communication state two. The state of the two groups of side valve bodies 326 is always opposite.

[0078] As shown in FIG. 1, the two groups of suction pipes 303 are respectively communicated with the valve hole three 329 on the two groups of side valve bodies 326. Figure 8

[0079] The output pipe 203 comprises a main pipe one communicated with the detection unit 202, and the end of the main pipe one extends two groups of branch pipes one, which are respectively communicated with the valve hole four 330 on the two groups of side valve bodies 326.

[0080] The connecting pipe two 305 comprises a main pipe two communicated with the valve hole two 328, and the main pipe two is communicated with the valve hole one 327 through a branch pipe two.

[0081] The working process of the traction device 300 is specifically manifested as follows:

[0082] When the side valve body 326 is in a communication state two, the corresponding vacuum pump 302 is paused, and the corresponding gas tank 301 is in a vacuum state. At this time: under the action of vacuum negative pressure, the air sample passes through the input pipe 201, the detection unit 202, the output pipe 203, the valve hole four 330 and the valve groove in the side valve body 326 in the communication state two, and the valve hole two 328 and the connecting pipe two 305 into the gas tank 301 in sequence, that is, the gas tank 301 drives the air sample to flow in the detection device 200 through the vacuum negative pressure mode, and finally the air sample after detection is stored in the gas tank 301.​

[0083] When the side valve body 326 is in the communication state one, the corresponding vacuum pump 302 is started, and the corresponding air tank 301 is vacuumized, at this time: the air in the air tank 301 is sequentially extracted and discharged by the vacuum pump 302 through the connecting pipe two 305, the valve hole one 327 in the side valve body 326 in the communication state one, the valve groove and the valve hole three 329, and the suction pipe 303, so that the air tank 301 is in a vacuum state.

[0084] When the air tank 301 is vacuumized, the area between the piston 309 and the side valve cover 325 is vacuumized together due to the communication through the connecting hole 313, the connecting pipe one 304 and the air tank 301, and under the action of negative pressure, the piston 309 moves close to the side valve cover 325, and during the movement:

[0085] Firstly, due to the existence of the damping unit, the switching shaft 318 is not moved, and the spring one 311 is compressed, and when the compression amount of the spring one 311 reaches the maximum, the piston 309 and the switching shaft 318 can be regarded as being connected, at this time, the movement of the piston 309 can overcome the damping of the damping unit, and the switching shaft 318 is moved, after the damping body 322 in the damping unit retracts into the damping groove 320, the contact between the damping unit and the main valve body 308 is changed from surface contact to line contact, the friction is greatly reduced, and at the same time, the spring one 311 releases the elastic force to drive the fixed body 310 and the switching shaft 318 to move quickly, that is to say, when the compression amount of the spring one 311 reaches the maximum, the piston 309 is slightly moved to overcome the damping of the damping unit, so that the damping unit is separated from the ring groove 314, and then under the action of the elastic force of the spring one 311, the switching shaft 318 and the damping unit move quickly, the damping unit moves into another ring groove 314, and the switching shaft 318 moves with the valve core 331, so as to make the side valve body 326 change the state.

[0086] In summary, in the present application, a group of air tanks 301 are in an approximate vacuum state, and air samples are dragged to flow in the detection device 200, and another group of air tanks 301 are vacuumized by the vacuum pump 302, when being in a critical limit, that is, the air pressure in a group of air tanks 301 approaches a preset value, and the vacuumization of another group of air tanks 301 is completed, at this time, the switching mechanism 307 quickly changes the state of the two groups of air tanks 301, the air tank 301 previously dragging the air sample to flow starts to be vacuumized, and the air tank 301 previously being vacuumized starts to drag the air sample to flow, so that the ozone detection process of the air sample is continuously carried out without pausing, and the state change of the two groups of air tanks 301 occurs instantaneously, so that the state change does not cause the air sample to fluctuate in the detection device 200.

[0087] Further, as shown in FIG. 6, the air tank 301 is provided with a plurality of air inlets 306, and the air inlet 306 is connected with the connecting pipe one 304. Figure 10As shown, the outer part of the main valve body 308 is provided with an air hole 315 between the two groups of pistons 309, which means that the area between the two groups of pistons 309 can maintain normal pressure during the movement of the pistons 309 due to the existence of the air hole 315.

[0088] Further, in the above process, the vacuum pump 302 is provided with two groups corresponding to the two groups of air tanks 301, so when the state of the air tank 301 changes, the vacuum pump 302 also needs to be paused or started, which is very cumbersome, not to mention that there may be a delay, resulting in the two groups of air tanks 301 not timely, therefore, as Figure 8 As shown, the valve holes three 329 on the two groups of side valve bodies 326 are connected through an intermediate pipe, and the two groups of suction pipes 303 are connected with the intermediate pipe, so that during the detection process, the two groups of vacuum pumps 302 are started at the same time, and through the cooperation of the suction pipe 303 and the intermediate pipe, the same air tank 301 is vacuumized, the vacuumizing efficiency is higher, and the vacuum pump 302 does not need to be paused, further improving the timeliness of the state change of the two groups of air tanks 301.

[0089] The preferred embodiment, as Figure 11 As shown, the inside of the switching shaft 318 is hollow, the damping groove 320 is connected with the fixed hole through the communication hole 324, and the sliding plug 321 is further sleeved between the groove bottom and the damping body 322 in the damping groove 320. The spring 323 is arranged between the sliding plug 321 and the damping body 322.

[0090] As Figure 8 And Figure 13 As shown, the traction device 300 further comprises an adjusting component 306, the adjusting component 306 comprises a cylinder body 3061, the cylinder body 3061 is sleeved with a cylinder plug 3062, and the cylinder body 3061 is further provided with a telescopic rod 3064 for driving the cylinder plug 3062 to move. The telescopic rod 3064 can be an electric telescopic rod technology, which will not be repeated here.

[0091] The area of the cylinder body 3061 on the side away from the telescopic rod 3064 of the cylinder plug 3062 is named as a hydraulic area, and the hydraulic area is connected with the switching shaft 318 through an adjusting pipe 3063.

[0092] The cylinder plug 3062 is driven to move by the telescopic rod 3064, and then the hydraulic medium in the hydraulic area is pressed into the switching shaft 318 or the hydraulic medium in the switching shaft 318 is pulled back to the hydraulic area. The advantage of this is that the damping of the damping unit is derived from the friction between the damping body 322 and the ring groove 314, and the hydraulic medium is pressed into the switching shaft 318, which can push the sliding plug 321 away from the communication hole 324, increase the compression amount of the spring two 323, and then increase the damping of the damping unit. Conversely, the hydraulic medium in the switching shaft 318 is pulled back to the hydraulic area, which can pull the sliding plug 321 close to the communication hole 324, reduce the compression amount of the spring two 323, and then reduce the damping of the damping unit. That is, the damping of the damping unit can be adjusted by the adjusting part 306, and then the state switching critical limit of the side valve body 326 is adjusted, and then the final negative pressure value in the air tank 301 is adjusted when the air tank 301 is evacuated, and then the flow rate of the air sample in the air tank 301 is adjusted. The flow rate of the air sample in the detection device 200 is adjusted.

[0093] The above is only a preferred embodiment of the present application, not any form of limitation on the present application. Although the present application has been disclosed as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application, without departing from the technical solution of the present application, are still within the scope of the present application.

Claims

1. An ambient air ozone monitoring and control detection device comprising a mounting bracket, characterized in that: The mounting frame is provided with a detection device and a traction device, the traction device is used for continuously flowing the air sample in the detection device by a vacuum negative pressure traction mode, and the detection device is used for detecting the ozone concentration of the air sample by an ultraviolet light absorption method; The detection device comprises a detection unit and an ozone removal unit mounted on the mounting frame, the input end of the detection unit is provided with an input pipe, the output end is provided with an output pipe, the input end of the ozone removal unit is communicated with the input pipe through a side pipe one, the output end is communicated with the input pipe through a side pipe two, the communication position of the side pipe two and the input pipe is located downstream of the communication position of the side pipe one and the input pipe, a valve one is arranged on the side pipe two, a valve two is arranged on the input pipe and located between the communication position of the side pipe two and the input pipe and the communication position of the side pipe one and the input pipe; The traction device comprises two groups of gas tanks and two groups of vacuum pumps, a switching mechanism is arranged between the gas tank, the vacuum pump and the output pipe, the switching mechanism is used for changing the state of the two gas tanks at the same time, in the initial state, one gas tank flows the air sample in the detection device by a vacuum negative pressure mode, and the other gas tank is vacuumized; The air inlet end of the vacuum pump is provided with a suction pipe, the upper end of the gas tank is provided with a connecting pipe one, and the lower end is provided with a connecting pipe two, and the switching mechanism is arranged between the output pipe, the suction pipe, the connecting pipe one and the connecting pipe two; The switching mechanism comprises a main valve body, both ends of the main valve body are open, and both openings are matched with a side valve cover, one side of the two side valve covers extends a side valve body, both ends of the side valve body are open, the inner wall of the main valve body is coaxially provided with an annular groove, the cross section of the annular groove is arc-shaped, the annular groove is provided with two groups along the axial direction of the main valve body, and the main valve body is further provided with a damping unit and a switching shaft; The damping unit comprises a mounting body coaxially sleeved in the main valve body, the end face of the mounting body is provided with a fixed hole and an intermediate hole, the two hole openings of the fixed hole are coaxially extended with the switching shaft, the tail end of the switching shaft extends into the side valve body, the outer circular surface of the mounting body is radially provided with a damping groove, and the damping groove is provided with a damping part; The main valve body is coaxially fixed with a limiting ring two, the limiting ring two is provided with two groups, and the two groups of annular grooves are located between the two groups of limiting rings two, and when the damping unit contacts the limiting ring two, the damping unit is located at the position of the annular groove close to the limiting ring two.

2. The ambient air ozone monitoring and control detection device according to claim 1, characterized in that: The detection unit comprises two groups of connectors, the connector comprises a main connector body, one end of the main connector body is closed, one end is open and communicated with the input pipe or the output pipe, the outer circular surface of the main connector body extends an outer connecting nozzle in the radial direction, the free end of the outer connecting nozzle is provided with a tapping ring, the tapping ring comprises an inner ring and an outer ring parallel to the main connector body, the outer ring is a hollow circular ring shape, the inner ring is a hollow cylindrical shape, the outer ring and the inner ring are communicated through an inner connecting nozzle, the outer ring is communicated with the outer connecting nozzle, the two end faces of the inner ring in the axial direction are provided with mounting holes, the two mounting holes extend mounting pipes at the opposite hole openings, among the two groups of connectors, a detection pipe is arranged between the two mounting pipes arranged in opposite directions, among the two mounting pipes arranged in opposite directions, an ultraviolet light generator is arranged in one mounting pipe and a light detector is arranged in the other mounting pipe, and pipe covers are matched and mounted at the pipe openings of the two mounting pipes arranged in opposite directions.

3. The device according to claim 1, characterized in that: The damping component comprises a damping body sleeved in the damping groove, a spring two is arranged between the damping body and the bottom of the damping groove, one end of the damping body is in spherical shape, and in the initial state, the mounting body is located at any position of the ring groove and the spherical surface of the damping body is attached to the wall of the ring groove.

4. The ambient air ozone monitoring and control detection device according to claim 1, characterized in that: The piston is further sleeved in the main valve body, the piston is provided with two groups and is located on the two sides of the damping unit, the outer part of the switching shaft is fixed with a fixed body, the fixed body is located on the side of the piston away from the damping unit, and a spring one is arranged between the fixed body and the piston; The main valve body is further coaxially fixed with a limiting ring one, the limiting ring one is located on the side of the piston away from the damping unit, and a connecting hole is formed in the outer surface of the main valve body close to the side valve cover; The fixed body, the spring one, the limiting ring one and the connecting hole are correspondingly provided with two groups, and the two groups of connecting holes are respectively communicated with the two groups of connecting pipes one; The outer part of the main valve body is provided with an air hole, and the air hole is located between the two groups of pistons.

5. The ambient air ozone monitoring and control detection device according to claim 4, characterized in that: Each group of side valve bodies is provided with a valve core, the valve core is connected with the switching shaft, the outer surface of the side valve body is provided with valve holes one, two, three and four, the valve holes one and two are located on the same side of the side valve body, the valve holes three and four are located on the same side of the side valve body, the valve holes one and three are respectively located on the two sides of the side valve body, the valve holes one and three are located on the same straight line, the valve holes two and four are located on the same straight line, the outer circular surface of the valve core is provided with a valve groove in annular shape, when the valve groove is communicated with the valve holes one and three, the side valve body is in the communication state one, when the valve groove is communicated with the valve holes two and four, the side valve body is in the communication state two, and the states of the two groups of side valve bodies are always opposite.

6. The ambient air ozone monitoring and control detection device according to claim 5, characterized in that: The valve holes three on the two groups of side valve bodies are communicated through an intermediate pipe, the two groups of suction pipes are communicated with the intermediate pipe, the output pipe comprises a main pipeline one communicated with the detection unit, the end of the main pipeline one extends two groups of branch pipelines one, the two groups of branch pipelines one are respectively communicated with the valve holes four on the two groups of side valve bodies, the connecting pipe two comprises a main pipeline two communicated with the valve holes two, and the main pipeline two is communicated with the valve holes one through a branch pipeline two.

7. The detection method of the ambient air ozone measurement and control detection device according to claim 6, characterized in that: It comprises the following steps: Step one: in the initial state, one group of side valve bodies is in the communication state two, and the corresponding gas tank is in the vacuum negative pressure state, at this time: under the action of the vacuum negative pressure, the air sample sequentially passes through the input pipe, the detection unit, the output pipe, the valve holes four and the valve groove in the side valve body in the communication state two and the valve holes two and the connecting pipe two into the gas tank, that is, the air sample flows in the detection device by the gas tank in the vacuum negative pressure state, and the air sample is detected by the detection device; The other group of side valve bodies is in the communication state one, and the corresponding gas tank is vacuumed, at this time: the air in the gas tank sequentially passes through the connecting pipe two, the valve holes one and the valve groove in the side valve body in the communication state one and the valve holes three, the intermediate pipe and the suction pipe and is extracted and discharged by the vacuum pump; Step two: in step one, during the vacuuming process of the gas tank by the vacuum pump, the area between the piston and the side valve cover is communicated with the gas tank through the connecting hole, the connecting pipe one and the gas tank, so that the area is also vacuumed, under the action of the negative pressure, the piston moves close to the side valve cover, and during the movement of the piston: Firstly, due to the existence of the damping unit, the switching shaft is not moving, the spring is compressed, when the spring compression reaches the maximum, the piston continues to move, that is, to overcome the damping of the damping unit, with the switching shaft moving, at the same time, the spring releases the elastic force to drive the fixed body and the switching shaft to move, the switching shaft moves with the damping unit, so that the damping unit moves to another ring groove, the switching shaft moves with the valve core, so that the two groups of side valve bodies change state, and then the air tank flowing with the air sample is started to be vacuumized, and the air tank being vacuumized is started to flow with the air sample. In this way, the air sample continuously flows in the detection device until the detection is completed.

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