A pulsating airflow regulating valve for a sampling pump used in environmental monitoring equipment

Abstract

The present application relates to the technical field of valves, and discloses a pulsating airflow regulating valve for a sampling pump for environmental monitoring equipment, which includes an air intake mechanism, a first pipeline, a second pipeline and an exhaust mechanism, the air intake mechanism is connected to the sampling pump, the first pipeline and the second pipeline are both connected between the air intake mechanism and the exhaust mechanism, the exhaust mechanism is connected to the monitoring equipment, the air intake mechanism includes an air intake pipe, a diverter block and a detection component, a diverter cavity is provided in the diverter block, two diverter channels are provided in the diverter block, the first pipeline is connected to the diverter cavity through one of the diverter channels, the second pipeline is connected to the diverter chamber through another diverter channel, a switch valve is provided in the diverter channel connected to the second pipeline, the length of the second pipeline is greater than the length of the first pipeline, the detection component detects the pressure of the airflow entering the diverter cavity, and the detection component is electrically connected to the switch valve. The present application can alleviate the problem that the monitoring data is prone to errors due to the strong pulsation of the airflow output by the diaphragm pump.

Description

Technical Field

[0001] The present application relates to the field of valves, and in particular to a pulsating airflow regulating valve of a sampling pump for environmental monitoring equipment. Background Art

[0002] In environmental monitoring, it is often necessary to collect gas samples in the atmosphere, such as air pollutants, greenhouse gases, etc. The vacuum pump can efficiently and accurately extract gas samples from the atmosphere by creating a vacuum environment for subsequent analysis.

[0003] The gas sampling process has relatively stringent requirements on the sampling pump. The sampling pump is required to output a relatively smooth and stable airflow to ensure detection accuracy. At the same time, the sampling pump is required to be compatible with complex media and be stable and reliable for long-term continuous operation.

[0004] At present, the sampling pumps commonly used in the environmental monitoring industry are diaphragm pumps and rotary vane pumps. Diaphragm pumps have strong media compatibility and long service life. However, as a reciprocating positive displacement pump, the diaphragm pump achieves medium transmission by changing the volume of the pump chamber through the reciprocating motion of the diaphragm. The pulsation of its output airflow is strong, and the detection equipment is prone to monitoring errors due to gas pressure fluctuations. The airflow output by the rotary vane pump is relatively stable, but the service life of the rotary vane pump is short, and its key component, the carbon brush, is a consumable and has a relatively high cost of use.

[0005] With respect to the above-mentioned related technologies, the inventors believe that there is a defect that the monitoring data is prone to errors due to the strong pulsation of the airflow output by the diaphragm pump. Summary of the invention

[0006] In order to alleviate the problem that the monitoring data is prone to errors due to the strong pulsation of the air flow output by the diaphragm pump, the present application provides a pulsating air flow regulating valve for a sampling pump used in environmental monitoring equipment.

[0007] The present application provides a pulsating airflow regulating valve for a sampling pump for environmental monitoring equipment, which adopts the following technical solution:

[0008] A pulsating airflow regulating valve for a sampling pump for an environmental monitoring device comprises an air intake mechanism, a first pipeline, a second pipeline and an exhaust mechanism, wherein the air intake mechanism is connected to the sampling pump, the first pipeline and the second pipeline are both connected between the air intake mechanism and the exhaust mechanism, the exhaust mechanism is connected to the monitoring device, the air intake mechanism comprises an air intake pipe, a flow splitter block and a detection component, a flow splitter cavity is provided in the flow splitter block, an air inlet is provided on the side wall of the flow splitter block, the air inlet is connected to the flow splitter cavity, one end of the air intake pipe is connected to the sampling pump, the other end of the air intake pipe is connected to the air inlet, the flow splitter Two diversion channels are provided in the block, the first pipeline is connected with the diversion cavity through one of the diversion channels, the second pipeline is connected with the diversion cavity through the other diversion channel, a switch valve is provided in the diversion channel connected with the second pipeline, the switch valve is used to control the on-off between the second pipeline and the diversion cavity, the length of the second pipeline is greater than the length of the first pipeline, an installation groove is provided on the inner wall of the diversion cavity away from the air inlet, the detection component is provided in the installation groove, the detection component is used to detect the pressure of the airflow entering the diversion cavity, and the detection component is electrically connected to the switch valve.

[0009] By adopting the above technical scheme, a pulsating airflow regulating valve is connected between the sampling pump and the monitoring equipment, and the air drawn by the sampling pump enters the diversion chamber through the air inlet pipe. The detection component is used to detect the pressure of the airflow entering the diversion chamber in real time. When the detection component detects the peak value of the pulsating airflow, the detection component transmits a signal to the switch valve to open the switch valve, and the first pipeline is diverted by the second pipeline. When the detection component detects the valley value of the pulsating airflow, the detection component transmits a signal to the switch valve to close the switch valve. Since the length of the second pipeline is greater than the length of the first pipeline, the time for air to flow through the second pipeline is greater than the time for air to flow through the first pipeline, thereby supplementing the airflow diverted at the peak value of the pulsating airflow to the airflow at the valley value of the pulsating airflow, so as to achieve the peak and valley values ​​of the balanced airflow, make the peak and valley values ​​of the airflow more even, and stabilize the flow rate, thereby alleviating the problem of easy errors in monitoring data caused by the strong pulsation of the airflow output by the diaphragm pump.

[0010] Optionally, the detection assembly includes a slider, a spring and a pressure detection sensor, the pressure sensor is arranged at one end of the mounting groove away from the air inlet, the slider is sealingly and slidingly connected to the mounting groove, the slider is elastically connected to the detection end of the pressure detection sensor through the spring, and the pressure detection sensor is electrically connected to the switch valve.

[0011] By adopting the above technical solution, the slider is elastically connected to the detection section of the pressure detection sensor through a spring. After the air sucked in by the sampling pump enters the diversion chamber, the slider moves toward the direction close to the pressure detection sensor under the action of air pressure. The slider transmits the pressure it is subjected to to the pressure detection sensor through the spring, so that the pressure detection sensor collects the peak and valley values ​​of the pulsating airflow according to the pressure transmitted by the slider.

[0012] Optionally, the length of the second pipeline is adjustable.

[0013] By adopting the above technical solution, the length of the second pipeline can be adjusted. Since the pulsating characteristics of the airflow output by the sampling pump will change with the power change of the sampling pump, the length of the second pipeline can be adjusted according to the periodic changes of the peak and valley values ​​of the airflow, thereby improving the applicability of the pulsating airflow regulating valve and ensuring the working effect of the pulsating airflow regulating valve.

[0014] Optionally, the second pipeline includes a first tube, a second tube and an adjusting assembly, one end of the first tube is connected to the diversion channel through a hose, the other end of the first tube is inserted into one end of the second tube, the second tube is coaxially arranged with the first tube, the second tube is sealed and slidably connected to the first tube, one end of the second tube away from the first tube is connected to the exhaust mechanism through a hose, the first tube and the second tube are both connected to the adjusting assembly, the adjusting assembly is used to control the relative sliding between the first tube and the second tube, and the pressure detection sensor is electrically connected to the adjusting assembly.

[0015] By adopting the above technical solution, the second tube is sleeved on the outside of the first tube and the second tube is sealed and slidably connected to the first tube. When the second tube slides in the direction away from the first tube, the length of the second pipeline increases. When the second tube slides in the direction close to the first tube, the length of the second pipeline decreases. The pressure detection sensor is electrically connected to the regulating component that controls the relative sliding between the first tube and the second tube. When the pressure detection sensor detects that the cycle of the peak and valley values ​​of the airflow pulsation changes, the pressure detection sensor transmits a signal to the regulating component. The regulating component changes the length of the second pipeline by driving the first tube and the second tube to slide relative to each other, thereby ensuring the working effect of the pulsating airflow regulating valve.

[0016] Optionally, a limiting block is provided on the outer wall of the first tube, the positioning block is located at one end of the first tube close to the second tube, a limiting groove corresponding to the limiting block is opened on the inner wall of the second tube, the limiting groove is opened along the axial direction of the second tube, and the limiting block is slidably connected in the limiting groove.

[0017] Optionally, the adjustment assembly includes a driving motor, a bidirectional lead screw and two nuts, the bidirectional lead screw is drivingly connected to the driving motor, the two nuts are rotatably connected to the bidirectional lead screw, the bidirectional lead screw drives the two nuts to move in a direction approaching or moving away from each other, one of the nuts is fixedly connected to the first tube, and the other of the nuts is fixedly connected to the second tube, and the driving motor is electrically connected to the pressure detection sensor.

[0018] By adopting the above technical solution, the bidirectional lead screw is connected to the drive motor in transmission. When the pressure detection sensor detects that the period of the peak and valley values ​​of the airflow pulsation changes, the pressure detection sensor transmits a signal to the drive motor. The drive motor rotates according to the signal transmitted by the pressure detection sensor. The bidirectional lead screw rotates under the drive of the drive motor, thereby driving the first tube and the second tube to slide relative to each other through two nuts, thereby realizing the adjustment of the length of the second pipeline. The adjustment process of the second pipeline is relatively stable, and the length adjustment is highly accurate.

[0019] Optionally, the exhaust mechanism includes a mixing joint, which includes a connecting pipe and two guide pipes, one end of the connecting pipe is connected to the monitoring device, and the two guide pipes are connected to the end of the connecting pipe away from the monitoring device, the guide pipe includes a connecting part and a guiding part, the connecting part of the guide pipe is arranged parallel to the connecting pipe, the guide parts of the two guide pipes are spirally arranged relative to each other, the guiding parts of the guide pipe are connected to the connecting pipe, the connecting part of one of the guide pipes is connected to the first pipeline, and the second pipe is connected to the connecting part of the other guide pipe through a hose.

[0020] By adopting the above technical solution, the first pipeline and the second pipeline are connected to the connecting pipe through the guide pipe. Before the airflow in the first pipeline is mixed with the airflow in the second pipeline, the guide pipe is used to guide the airflow in the first pipeline and the airflow in the second pipeline, so that the two airflows flow in a spiral after entering the connecting pipe. The two airflows are mixed during the spiral flow, thereby improving the uniformity of the airflow mixing and reducing the pressure loss during the airflow mixing process.

[0021] Optionally, the air intake pipe is connected to an air pressure regulating assembly, a regulating port is opened on the side wall of the air intake pipe, the air pressure regulating assembly includes a filling block and an electric push cylinder, the cylinder body of the electric push cylinder is fixedly connected to the air intake pipe, the filling block is fixedly connected to the piston cylinder of the electric push cylinder, the filling block is used to close the regulating port, and the filling block is sealed and slidably connected to the regulating port.

[0022] By adopting the above technical solution, an air pressure regulating assembly is connected to the intake pipe. When the air pressure in the intake pipe is too low due to the intake pipe being too long, the piston rod of the electric push cylinder extends to drive the filling block to move into the intake pipe, thereby reducing the cross-sectional area of ​​the intake pipe perpendicular to its axial direction and increasing the gas pressure entering the diversion chamber, making it easier for the pressure detection sensor to detect the peak and valley values ​​of the pulsating airflow.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] By connecting a pulsating airflow regulating valve between the sampling pump and the monitoring equipment, the air drawn by the sampling pump enters the diversion chamber through the air inlet pipe, and the pressure of the airflow entering the diversion chamber is detected in real time by the detection component. When the detection component detects the peak value of the pulsating airflow, the detection component transmits a signal to the switch valve to open the switch valve, and the first pipeline is diverted by the second pipeline. When the detection component detects the valley value of the pulsating airflow, the detection component transmits a signal to the switch valve to close the switch valve. Since the length of the second pipeline is greater than the length of the first pipeline, the time for air to flow through the second pipeline is greater than the time for air to flow through the first pipeline, thereby supplementing the airflow diverted at the peak value of the pulsating airflow to the airflow at the valley value of the pulsating airflow, achieving balanced peak and valley values ​​of the airflow, making the peak and valley values ​​of the airflow more even, and stabilizing the flow rate, alleviating the problem of easy errors in monitoring data due to the strong pulsation of the airflow output by the diaphragm pump;

[0025] By setting the length of the second pipeline to be adjustable, since the pulsation characteristics of the output airflow of the sampling pump will change with the power change of the sampling pump, the length of the second pipeline can be adjusted according to the periodic changes of the peak and valley values ​​of the airflow, thereby improving the applicability of the pulsating airflow regulating valve and ensuring the working effect of the pulsating airflow regulating valve;

[0026] The first pipeline and the second pipeline are both connected to the connecting pipe through the guide pipe. Before the airflow in the first pipeline is mixed with the airflow in the second pipeline, the guide pipe is used to guide the airflow in the first pipeline and the airflow in the second pipeline, so that the two airflows flow in a spiral after entering the connecting pipe. The two airflows are mixed during the spiral flow, thereby improving the uniformity of airflow mixing and reducing the pressure loss during the airflow mixing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0029] Figure 2 is a structural schematic diagram of the air intake mechanism part in the embodiment of the present application;

[0030] Figure 3 It is a schematic diagram of the structure of the regulating component and the mixing joint part in the embodiment of the present application;

[0031] Figure 4 It is a schematic diagram of the structure of the first tube and the second tube parts in an embodiment of the present application.

[0032] 1. Air intake mechanism; 2. Air intake pipe; 3. Adjusting port; 4. Diverter block; 5. Diverter chamber; 6. Air intake port; 7. Diverter channel; 8. Switch valve; 9. Mounting groove; 10. Detection assembly; 11. Spring; 12. Slider; 13. Pressure detection sensor; 14. Air pressure regulating assembly; 14. Filling block; 14. Electric cylinder; 20. First pipeline; 30. Second pipeline; 31. First pipe; 31. Limiting block; 32. Second pipe; 32. Limiting groove; 33. Adjusting assembly; 33. Driving motor; 33. Bidirectional lead screw; 33. Nut; 400. Mixing joint; 41. Connecting pipe; 420. Guide pipe; 421. Connecting part; 422. Guide part. DETAILED DESCRIPTION

[0033] In order to more clearly explain the overall concept of this application, the following Figure 1-Figure 4 This application is described in further detail.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features in each embodiment may be combined with each other without conflict.

[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The present application embodiment discloses a pulsating airflow regulating valve for a sampling pump for an environmental monitoring device. Figure 1 A pulsating airflow regulating valve for a sampling pump for an environmental monitoring device includes an air intake mechanism 100, a first pipeline 200, a second pipeline 300 and an exhaust mechanism. The air intake mechanism 100 is connected to the sampling pump, the first pipeline 200 and the second pipeline 300 are both connected between the air intake mechanism 100 and the exhaust mechanism, and the exhaust mechanism is connected to the monitoring device.

[0037] Reference Figure 1The air intake mechanism 100 includes an air intake pipe 110, a diverter block 120 and a detection assembly 130. A diverter cavity 121 is provided in the diverter block 120, and an air inlet 122 is provided on the side wall of the diverter block 120, and the air inlet 122 is connected to the diverter cavity 121. One end of the air intake pipe 110 is connected to the sampling pump, and the other end of the air intake pipe 110 is connected to the air inlet 122. An air pressure regulating assembly 140 is installed on the air intake pipe 110, and an adjusting port 111 is provided on the side wall of the air intake pipe 110. The air pressure regulating assembly 140 includes a filling block 141 and an electric push cylinder 142. The cylinder body of the electric push cylinder 142 is fixedly connected to the air intake pipe 110, and the filling block 141 is fixedly connected to the piston cylinder of the electric push cylinder 142. The filling block 141 is used to close the adjusting port 111, and the filling block 141 is sealed and slidably connected to the adjusting port 111.

[0038] Two shunt channels 123 are provided in the shunt block 120. The first pipeline 200 is connected to the shunt chamber 121 through one of the shunt channels 123, and the second pipeline 300 is connected to the shunt chamber 121 through the other shunt channel 123. A switch valve 124 is provided in the shunt channel 123 connected to the second pipeline 300. The switch valve 124 is used to control the connection between the second pipeline 300 and the shunt chamber 121. The length of the second pipeline 300 is greater than the length of the first pipeline 200. An installation groove 125 is provided on the inner wall of the shunt chamber 121 away from the air inlet 122. The detection component 130 is provided in the installation groove 125. The detection component 130 is used to detect the pressure of the airflow entering the shunt chamber 121. The detection component 130 is electrically connected to the switch valve 124.

[0039] The air drawn by the sampling pump enters the diversion chamber 121 through the air inlet pipe 110, and the detection component 130 is used to detect the pressure of the airflow entering the diversion chamber 121 in real time. When the detection component 130 detects the peak value of the pulsating airflow, the detection component 130 transmits a signal to the switch valve 124 to open the switch valve 124, and uses the second pipeline 300 to divert the first pipeline 200. When the detection component 130 detects the valley value of the pulsating airflow, the detection component 130 transmits a signal to the switch valve 124 to close the switch valve 124. Since the length of the second pipeline 300 is greater than the length of the first pipeline 200, the time for air to flow through the second pipeline 300 is greater than the time for air to flow through the first pipeline 200, thereby supplementing the airflow diverted at the peak value of the pulsating airflow to the airflow at the valley value of the pulsating airflow, achieving a balanced peak and valley value of the airflow, making the peak and valley value of the airflow more even, and stabilizing the flow rate, alleviating the problem of easy errors in monitoring data due to the strong pulsation of the airflow output by the diaphragm pump. When the air pressure in the intake pipe 110 is low due to the intake pipe 110 being too long, the piston rod of the electric push cylinder 142 extends to drive the filling block 141 to move into the intake pipe 110, thereby reducing the cross-sectional area of ​​the intake pipe 110 perpendicular to its axial direction and increasing the gas pressure entering the diversion chamber 121, making it easier for the pressure detection sensor 133 to detect the peak and valley values ​​of the pulsating airflow.

[0040] The detection assembly 130 includes a slider 132, a spring 131 and a pressure detection sensor 133. The pressure sensor is arranged at one end of the mounting groove 125 away from the air inlet 122, the slider 132 is sealingly slidably connected to the mounting groove 125, the slider 132 is elastically connected to the detection end of the pressure detection sensor 133 through the spring 131, and the pressure detection sensor 133 is electrically connected to the switch valve 124.

[0041] After the air sucked in by the sampling pump enters the diversion chamber 121, the slider 132 moves toward the direction close to the pressure detection sensor 133 under the action of air pressure. The slider 132 transmits the pressure to the pressure detection sensor 133 through the spring 131, so that the pressure detection sensor 133 collects the peak and valley values ​​of the pulsating airflow according to the pressure transmitted by the slider 132.

[0042] Reference Figure 1, the length of the second pipeline 300 is adjustable. The second pipeline 300 includes a first pipe 310, a second pipe 320 and an adjusting assembly 330. One end of the first pipe 310 is connected to the diversion channel 123 through a hose, and the other end of the first pipe 310 is arranged through one end of the second pipe 320. The second pipe 320 is coaxially arranged with the first pipe 310, and the second pipe 320 is sealed and slidably connected with the first pipe 310, and one end of the second pipe 320 away from the first pipe 310 is connected to the exhaust mechanism through a hose. The first pipe 310 and the second pipe 320 are both connected to the adjusting assembly 330, and the adjusting assembly 330 is used to control the relative sliding between the first pipe 310 and the second pipe 320. The adjustment component 330 includes a driving motor 331, a bidirectional lead screw 332 and two nuts 333. The bidirectional lead screw 332 is transmission-connected to the driving motor 331. The two nuts 333 are rotationally connected to the bidirectional lead screw 332. The bidirectional lead screw 332 drives the two nuts 333 to move in a direction approaching or moving away from each other. One of the nuts 333 is fixedly connected to the first tube 310, and the other nut 333 is fixedly connected to the second tube 320. The driving motor 331 is electrically connected to the pressure detection sensor 133.

[0043] In another preferred embodiment, the second pipeline 300 includes a retractable hose, one end of which is connected to the diversion channel 123, and the other end of which is connected to the exhaust mechanism.

[0044] A limiting block 311 is provided on the outer wall of the first tube 310, and the positioning block is located at one end of the first tube 310 close to the second tube 320. A limiting groove 321 corresponding to the limiting block 311 is opened on the inner wall of the second tube 320, and the limiting groove 321 is opened along the axial direction of the second tube 320, and the limiting block 311 is slidably connected in the limiting groove 321.

[0045] Since the pulsating characteristics of the airflow output by the sampling pump will change with the power change of the sampling pump, the length of the second pipeline 300 can be adjusted according to the periodic changes of the peak and valley values ​​of the airflow. The pressure detection sensor 133 is electrically connected to the adjustment component 330 that controls the relative sliding between the first tube 310 and the second tube 320. When the pressure detection sensor 133 detects that the periodic changes of the peak and valley values ​​of the airflow pulsation occur, the pressure detection sensor 133 transmits a signal to the adjustment component 330. The adjustment component 330 changes the length of the second pipeline 300 by driving the first tube 310 and the second tube 320 to slide relative to each other, thereby ensuring the working effect of the pulsating airflow regulating valve.

[0046] The bidirectional lead screw 332 is connected to the driving motor 331 in a transmission manner. When the pressure detection sensor 133 detects that the period of the peak-to-valley value of the airflow pulsation changes, the pressure detection sensor 133 transmits a signal to the driving motor 331, and the driving motor 331 rotates according to the signal transmitted by the pressure detection sensor 133. The bidirectional lead screw 332 rotates under the drive of the driving motor 331, thereby driving the first tube 310 and the second tube 320 to slide relative to each other through the two screw nuts 333. The second tube 320 is sleeved on the outside of the first tube 310 and the second tube 320 is sealed and slidably connected with the first tube 310. When the second tube 320 slides in a direction away from the first tube 310, the length of the second pipeline 300 increases; when the second tube 320 slides in a direction close to the first tube 310, the length of the second pipeline 300 decreases, thereby realizing the adjustment of the length of the second pipeline 300. The adjustment process of the second pipeline 300 is relatively stable, and the length adjustment has high accuracy.

[0047] Reference Figure 1 The exhaust mechanism includes a mixing joint 400, which includes a connecting pipe 410 and two guide pipes 420. One end of the connecting pipe 410 is connected to the monitoring device. The two guide pipes 420 are connected to the end of the connecting pipe 410 away from the monitoring device. The guide pipe 420 includes a connecting portion 421 and a guiding portion 422. The connecting portion 421 of the guide pipe 420 is arranged parallel to the connecting pipe 410. The guiding portions 422 of the two guide pipes 420 are relatively spirally arranged. The guiding portions 422 of the guide pipe 420 are connected to the connecting pipe 410, wherein the connecting portion 421 of one of the guide pipes 420 is connected to the first pipeline 200, and the second pipe 320 is connected to the connecting portion 421 of the other guide pipe 420 through a hose.

[0048] Before the airflow in the first pipeline 200 is mixed with the airflow in the second pipeline 300, the guide pipe 420 is used to guide the airflow in the first pipeline 200 and the airflow in the second pipeline 300 so that the two airflows flow in a spiral after entering the connecting pipe 410. The two airflows are mixed during the spiral flow, thereby improving the uniformity of the airflow mixing and reducing the pressure loss during the airflow mixing process.

[0049] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0050] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pulsating airflow regulating valve for a sampling pump for environmental monitoring equipment, characterized in that: The invention comprises an air intake mechanism (100), a first pipeline (200), a second pipeline (300) and an exhaust mechanism, wherein the air intake mechanism (100) is connected to a sampling pump, the first pipeline (200) and the second pipeline (300) are both connected between the air intake mechanism (100) and the exhaust mechanism, and the exhaust mechanism is connected to a monitoring device. The air intake mechanism (100) comprises an air intake pipe (110), a flow splitter block (120) and a detection component (130), a flow splitter cavity (121) is provided in the flow splitter block (120), an air intake port (122) is provided on a side wall of the flow splitter block (120), the air intake port (122) is connected to the flow splitter cavity (121), one end of the air intake pipe (110) is connected to the sampling pump, and the other end of the air intake pipe (110) is connected to the air intake port (122), two flow splitter channels (123) are provided in the flow splitter block (120), and the detection component (130) is connected to the monitoring device. The first pipeline (200) is in communication with the diverter chamber (121) through one of the diverter channels (123), and the second pipeline (300) is in communication with the diverter chamber (121) through another diverter channel (123). A switch valve (124) is provided in the diverter channel (123) in communication with the second pipeline (300), and the switch valve (124) is used to control the connection and disconnection between the second pipeline (300) and the diverter chamber (121). The length of the second pipeline (300) is greater than that of the first pipeline (200). A mounting groove (125) is provided on the inner wall of the diverter chamber (121) away from the air inlet (122), and the detection component (130) is arranged in the mounting groove (125). The detection component (130) is used to detect the pressure of the airflow entering the diverter chamber (121), and the detection component (130) is electrically connected to the switch valve (124); The length of the second pipeline (300) can be adjusted; The second pipeline (300) comprises a first tube (310), a second tube (320) and an adjusting assembly (330); one end of the first tube (310) is connected to the flow diversion channel (123) via a hose; the other end of the first tube (310) is inserted into one end of the second tube (320); the second tube (320) and the first tube (310) are coaxially arranged; the second tube (320) and the first tube (310) are sealed and slidably connected; one end of the second tube (320) away from the first tube (310) is connected to the exhaust mechanism via a hose; the first tube (310) and the second tube (320) are both connected to the adjusting assembly (330); the adjusting assembly (330) is used to control the relative sliding between the first tube (310) and the second tube (320); The exhaust mechanism comprises a mixing joint (400), the mixing joint (400) comprising a connecting pipe (410) and two guide pipes (420), one end of the connecting pipe (410) being in communication with a monitoring device, the two guide pipes (420) being connected to an end of the connecting pipe (410) away from the monitoring device, the guide pipe (420) comprising a connecting portion (421) and a guide portion (422), the guide portion (422) of the guide pipe (420) being connected to the connecting pipe (410), the connecting portion (421) of one of the guide pipes (420) being connected to the first pipeline (200), and the second pipe (320) being connected to the connecting portion (421) of the other guide pipe (420) via a hose.

2. The pulsating airflow regulating valve of a sampling pump for environmental monitoring equipment according to claim 1, characterized in that: The detection assembly (130) comprises a slider (132), a spring (131) and a pressure detection sensor (133); the pressure detection sensor (133) is arranged at one end of the mounting groove (125) away from the air inlet (122); the slider (132) is sealingly and slidably connected to the mounting groove (125); the slider (132) is elastically connected to the detection end of the pressure detection sensor (133) via the spring (131); and the pressure detection sensor (133) is electrically connected to the switch valve (124).

3. The pulsating airflow regulating valve of a sampling pump for environmental monitoring equipment according to claim 2, characterized in that: The pressure detection sensor (133) is electrically connected to the adjustment component (330).

4. The pulsating airflow regulating valve of a sampling pump for environmental monitoring equipment according to claim 1, characterized in that: A limiting block (311) is provided on the outer wall of the first tube (310), the limiting block (311) being located at one end of the first tube (310) close to the second tube (320), and a limiting groove (321) corresponding to the limiting block (311) is provided on the inner wall of the second tube (320), the limiting groove (321) being provided along the axial direction of the second tube (320), and the limiting block (311) being slidably connected in the limiting groove (321).

5. The pulsating airflow regulating valve of a sampling pump for environmental monitoring equipment according to claim 3, characterized in that: The adjustment assembly (330) comprises a driving motor (331), a bidirectional lead screw (332) and two screw nuts (333); the bidirectional lead screw (332) is drivingly connected to the driving motor (331); the two screw nuts (333) are both rotatably connected to the bidirectional lead screw (332); the bidirectional lead screw (332) drives the two screw nuts (333) to move in a direction approaching or moving away from each other; one of the screw nuts (333) is fixedly connected to the first tube (310), and the other of the screw nuts (333) is fixedly connected to the second tube (320); and the driving motor (331) is electrically connected to the pressure detection sensor (133).

6. The pulsating airflow regulating valve of a sampling pump for environmental monitoring equipment according to claim 1, characterized in that: The connecting portion (421) of the guide tube (420) is arranged in parallel with the connecting tube (410), and the guiding portions (422) of the two guide tubes (420) are arranged in a spiral relative to each other.

7. The pulsating airflow regulating valve of a sampling pump for environmental monitoring equipment according to claim 1, characterized in that: The air intake pipe (110) is connected to an air pressure regulating assembly (140), a regulating port (111) is provided on a side wall of the air intake pipe (110), the air pressure regulating assembly (140) comprises a filling block (141) and an electric push cylinder (142), the cylinder body of the electric push cylinder (142) is fixedly connected to the air intake pipe (110), the filling block (141) is fixedly connected to the piston cylinder of the electric push cylinder (142), the filling block (141) is used to close the regulating port (111), and the filling block (141) is sealingly and slidably connected to the regulating port (111).

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