High-low sampler based on bypass gas circuit and control method of high-low sampler

Abstract

According to the high-low sampler based on the bypass gas circuit and the control method of the high-low sampler based on the bypass gas circuit, high-low flow sampling is switched through the bypass gas circuit, intelligent regulation and control are achieved in cooperation with a control unit, a user only needs to set a mode, gas circuit switching and flow adjustment can be automatically completed, the process is simplified, part replacement and valve adjustment are reduced, and equipment abrasion is reduced; besides, the gas quantity is accurately controlled through a diaphragm pump assembly, airflow can be accurately distributed in a low-flow mode through the design of a bypass gas path, specific-proportion sampling is achieved, and full-flow stable output is guaranteed in a high-flow mode; in addition, the pressure difference probe measures and feeds back the pressure difference of a source taking point in real time, the control unit dynamically adjusts the rotating speed of the motor according to the pressure difference, closed-loop control is formed, accurate flow and abnormal pressure difference are ensured, a protection mechanism can be triggered in time, the accuracy and consistency of sampling results are effectively improved, and diversified sampling requirements are met.

Description

Technical Field

[0001] This invention relates to the field of high and low sampler technology, and in particular to a high and low sampler based on a bypass air path and its control method. Background Technology

[0002] In fields such as environmental monitoring, industrial process control, and gas analysis, high and low flow samplers are widely used as key equipment for gas sample collection and flow control. Their core function is to flexibly switch between high and low flow sampling modes according to actual needs, so as to meet the requirements of gas flow and sampling accuracy in different scenarios.

[0003] Traditional high and low flow samplers typically employ a single air path design, switching flow rates by adjusting valve openings or replacing sampling pumps of different specifications. However, this design has several limitations: firstly, frequent component replacements or valve adjustments are not only cumbersome but also prone to equipment wear and leakage, affecting the accuracy and reliability of sampling; secondly, a single air path design makes it difficult to achieve precise flow control, especially at low flow rates, where airflow stability at low flow rates is difficult to guarantee and is easily affected by external interference, thus reducing sampling accuracy. Summary of the Invention

[0004] In view of this, the present invention proposes a high and low sampler based on a bypass air path and its control method, which can effectively solve the defects of the prior art, such as cumbersome operation, easy equipment wear and leakage, and difficulty in achieving precise flow control.

[0005] The technical solution of this invention is implemented as follows:

[0006] A high / low sampling device based on a bypass air path includes:

[0007] A bypass air path is used for switching between high and low flow sampling;

[0008] Diaphragm pump assembly, used to compress gas and drive gas flow;

[0009] Differential pressure probe is used to measure the differential pressure at the source point in the bypass air path and feed it back to the control unit;

[0010] The control unit is used to control the diaphragm pump assembly and bypass air path based on the differential pressure data from the source point.

[0011] As a further optional embodiment of the high and low sampler based on the bypass air path, the bypass air path includes a first buffer, a second buffer, a first capillary, a second capillary, and an air path switching valve. The specific structural design of the bypass air path is as follows:

[0012] When the gas path switching valve is in the low flow position, part of the airflow passes through the air inlet, the first buffer, the diaphragm pump assembly, the second buffer, and the first capillary tube in sequence to circulate to the front end of the first buffer, and the remaining airflow passes through the air inlet, the first buffer, the diaphragm pump assembly, the second buffer, and the second capillary tube in sequence to flow out from the air outlet.

[0013] When the gas path switching valve is in the high flow position, the airflow passes through the inlet, the first buffer, the diaphragm pump assembly, the second buffer, the first capillary tube, and the second capillary tube in sequence and flows out from the outlet.

[0014] As a further alternative to the aforementioned high and low sampler based on the bypass air path, the specific ratio of the first capillary and the second capillary is as follows:

[0015] The ratio of the inner diameter of the first capillary to the second capillary is 1:2.2, and the ratio of the length of the first capillary to the second capillary is 1:0.7.

[0016] As a further alternative to the high and low sampler based on the bypass gas path, the diaphragm pump assembly includes a motor and a diaphragm pump head. The motor and the diaphragm pump head are mechanically connected. The motor drives the eccentric device to rotate, causing the diaphragm inside the diaphragm pump head to reciprocate, compressing the gas and driving the gas flow.

[0017] As a further optional solution for the high and low samplers based on the bypass air path, the source point is located at the front and rear ends of the first buffer, specifically including:

[0018] The first sampling point is located on the air inlet side of the first buffer and is used to monitor the air pressure difference between the sampler inlet and the first buffer.

[0019] The second sampling point is located between the outlet side of the first buffer and the inlet of the diaphragm pump, and is used to monitor the airflow pressure difference from the first buffer to the diaphragm pump assembly.

[0020] As a further alternative to the high and low sampler based on the bypass air path, the control unit controls the diaphragm pump assembly and the bypass air path based on the differential pressure data from the sampling point, specifically including:

[0021] It receives differential pressure data from the differential pressure probe and adjusts the speed of the diaphragm pump motor according to the preset calibration value;

[0022] It works in conjunction with the gas path switching valve to control the switching between high flow and low flow levels.

[0023] A high / low sampler control method based on a bypass air path, specifically including:

[0024] A bypass gas path and a diaphragm pump assembly are provided, wherein the bypass gas path is used for switching between high and low flow sampling, and the diaphragm pump assembly is used for compressing gas and driving gas flow.

[0025] Use a differential pressure probe to measure the differential pressure data at the sampling point in the bypass air path;

[0026] The control unit dynamically adjusts the diaphragm pump assembly and bypass air path based on the differential pressure data fed back by the differential pressure probe.

[0027] As a further optional embodiment of the high and low sampler control method based on the bypass air path, the bypass air path includes a first buffer, a second buffer, a first capillary, a second capillary, and an air path switching valve. The specific structural design of the bypass air path is as follows:

[0028] When the gas path switching valve is in the low flow position, part of the airflow passes through the air inlet, the first buffer, the diaphragm pump assembly, the second buffer, and the first capillary tube in sequence to circulate to the front end of the first buffer, and the remaining airflow passes through the air inlet, the first buffer, the diaphragm pump assembly, the second buffer, and the second capillary tube in sequence to flow out from the air outlet.

[0029] When the gas path switching valve is in the high flow position, the airflow passes through the inlet, the first buffer, the diaphragm pump assembly, the second buffer, the first capillary tube, and the second capillary tube in sequence and flows out from the outlet.

[0030] A computing device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of any of the above-described high and low sampler control methods based on a bypass air path.

[0031] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of any of the above-described high / low sampler control methods based on a bypass air path.

[0032] The beneficial effects of this invention are as follows: By utilizing a bypass gas path for switching between high and low flow sampling, and in conjunction with the intelligent control of the gas path and diaphragm pump assembly by the control unit, users only need to set the desired sampling mode through the control unit to automatically complete the gas path switching and flow adjustment without manual intervention, greatly simplifying the operation process. Simultaneously, mode switching is achieved by controlling the gas path switching valve, reducing frequent component replacements and valve adjustments, thus lowering equipment wear. Furthermore, the diaphragm pump assembly precisely controls the intake and compression of gas, and through the bypass gas path design, airflow can be precisely allocated in low flow mode, achieving a specific proportion of the actual sampling flow to the total flow, meeting different sampling needs. In high flow mode, it also ensures that the airflow directly passes through the main gas path for full flow sampling, guaranteeing the accuracy of flow control. In addition, the differential pressure probe can measure the pressure difference at the sampling point in the bypass gas path in real time and feed the data back to the control unit. Based on this pressure difference data, the control unit dynamically adjusts the motor speed of the diaphragm pump assembly, thereby achieving closed-loop flow control. When an abnormal pressure difference occurs, a protection mechanism can be triggered in a timely manner, greatly improving the accuracy and consistency of the sampling results. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the composition of a high and low sampler based on a bypass air path according to the present invention;

[0035] Figure 2 This is a schematic diagram of a high and low sampler based on a bypass air path according to the present invention;

[0036] Figure 3 This is a flowchart illustrating a high and low sampler control method based on a bypass air path according to the present invention.

[0037] Figure 4 This is a schematic diagram of the composition of a computing device according to the present invention. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] refer to Figures 1 to 4 A high / low pressure sampler based on a bypass air path includes a bypass air path, a diaphragm pump assembly, a differential pressure probe, and a control unit, wherein:

[0040] A bypass gas path is used for switching between high and low flow sampling; in some embodiments, the bypass gas path includes a first buffer, a second buffer, a first capillary, a second capillary, and a gas path switching valve, and the specific structural design of the bypass gas path is as follows:

[0041] When the gas path switching valve is in the low flow position, part of the airflow passes through the air inlet, the first buffer, the diaphragm pump assembly, the second buffer, and the first capillary tube in sequence to circulate to the front end of the first buffer, and the remaining airflow passes through the air inlet, the first buffer, the diaphragm pump assembly, the second buffer, and the second capillary tube in sequence to flow out from the air outlet.

[0042] When the gas path switching valve is in the high flow position, the airflow passes through the inlet, the first buffer, the diaphragm pump assembly, the second buffer, the first capillary tube, and the second capillary tube in sequence and flows out from the outlet.

[0043] Specifically, by switching the gas path switching valve to different positions (low flow and high flow), and in conjunction with the specific combination of components in the bypass gas path (first buffer, second buffer, first capillary, second capillary) and the airflow path design, the switching between high and low flow sampling modes can be accurately achieved. In the low flow position, part of the airflow circulates, reducing the actual flow rate from the outlet; in the high flow position, the airflow flows directly from the outlet, achieving full flow sampling. This clear mode division meets the diverse flow rate requirements of different sampling scenarios. Compared to traditional high and low flow samplers that achieve flow rate changes through complex operations (such as adjusting multiple valves or replacing components), this solution can easily complete mode switching simply by switching the gas path switching valve, making operation simpler and faster, and the accuracy of mode switching is higher.

[0044] The first and second buffers stabilize the airflow. During airflow, the buffers can buffer pressure fluctuations, allowing the airflow to pass through subsequent components more smoothly. Whether in low-flow or high-flow mode, they can reduce airflow fluctuations caused by unstable gas source pressure or other factors in the pipeline, ensuring the stability of the sampling flow rate. Traditional samplers, lacking effective buffering design, are prone to large fluctuations in sampling flow rate when the gas source pressure changes, affecting sampling accuracy. The buffers in this technical solution can effectively solve this problem and improve the sampler's adaptability to different gas source conditions.

[0045] At low flow rates, the ratio of circulating flow to actual sampling flow can be precisely controlled through the design of the first capillary and the circulation path of part of the airflow. This allows the actual sampling flow to be stabilized within a specific ratio range of the total flow (e.g., by adjusting capillary parameters to achieve different ratios such as 30%-50%), meeting the needs of scenarios requiring precise low-flow sampling. Generally, devices with low-flow sampling capabilities struggle to achieve such precise flow ratio control. This solution, through the ingenious design of the bypass air path, provides a more accurate flow control method for low-flow sampling, improving its accuracy and reliability.

[0046] The bypass air path design allows the airflow to flow along a specific path, avoiding airflow turbulence and concentrated impacts. The airflow pressure on each component (such as the diaphragm pump) is more uniform and reasonable, reducing the risk of component wear and damage caused by airflow impacts and extending the service life of the equipment. In traditional samplers, the airflow may have uneven distribution and local impacts, which can easily lead to premature damage to equipment components and increase maintenance costs. This technical solution effectively solves this problem through reasonable air path design, reducing the frequency and cost of equipment maintenance.

[0047] In some embodiments, the ratio of the first capillary to the second capillary is specifically as follows:

[0048] The ratio of the inner diameter of the first capillary to the second capillary is 1:2.2, and the ratio of the length of the first capillary to the second capillary is 1:0.7.

[0049] Specifically, the inner diameter ratio of the first capillary to the second capillary is 1:2.2, and the length ratio is 1:0.7. This design allows for precise control of the airflow circulating through the bypass air path and the actual sampling airflow in low-flow mode. Capillaries with different inner diameters and lengths exert different resistances on the airflow. By properly matching them, the airflow can be distributed according to a preset ratio (e.g., the actual sampling flow rate is 30%-50% of the total flow rate), meeting the precise requirements for low-flow sampling in different scenarios. Compared to samplers without precise capillary ratios or with unreasonable ratios, this solution can more accurately achieve flow control in low-flow mode, avoiding sampling errors caused by inaccurate flow ratios and improving the accuracy and reliability of low-flow sampling.

[0050] The specific inner diameter and length ratio endows the capillary assembly with unique airflow resistance characteristics. During high and low flow sampling, this resistance characteristic helps stabilize the airflow and reduce flow rate changes caused by factors such as air source pressure fluctuations and minor pipe blockages. Whether in low or high flow mode, it can keep the sampling flow rate relatively stable and ensure the consistency of sampling results. Traditional samplers may experience large fluctuations in sampling flow rate when encountering external interference due to unstable airflow resistance. However, this technical solution effectively improves the airflow resistance through the reasonable ratio of capillary tubes, enhances the sampler's resistance to various interference factors, and improves flow rate stability.

[0051] A diaphragm pump assembly is used to compress gas and drive gas flow; in some embodiments, the diaphragm pump assembly includes a motor and a diaphragm pump head, the motor and the diaphragm pump head are mechanically connected, the motor drives an eccentric device to rotate, causing the diaphragm inside the diaphragm pump head to reciprocate, compressing gas and driving gas flow.

[0052] Specifically, the diaphragm pump assembly uses a motor to drive an eccentric device to rotate, causing the diaphragm to reciprocate, thereby compressing and flowing the gas. This operating method can precisely control the amount of gas compressed and the flow rate, providing a stable and appropriate gas flow rate for the high and low flow samplers in different modes (high flow and low flow). For example, in high flow mode, a large amount of gas can be quickly compressed and driven to meet the full flow sampling requirements; in low flow mode, the gas flow rate can also be precisely controlled to ensure that the actual sampling flow rate meets the preset ratio. Compared with other types of gas driving devices, such as ordinary piston pumps or fans, diaphragm pumps can provide more stable and precise gas compression and driving, avoiding problems such as large flow fluctuations and improving the sampler's flow control accuracy.

[0053] It should be noted that the motor-driven eccentric device rotates, causing the diaphragm inside the diaphragm pump head to reciprocate. Specifically:

[0054] An eccentric device is an eccentric wheel or cam mounted on a motor shaft. When the motor rotates, the rotation center of the eccentric device does not coincide with the center of the motor shaft, causing its outer edge to generate periodic radial displacement during rotation. The eccentric device is connected to the diaphragm inside the diaphragm pump head via a connecting rod. When the eccentric device rotates, one end of the connecting rod moves in a circular motion with the eccentric device, while the other end pushes or pulls the diaphragm to make a linear reciprocating motion.

[0055] The diaphragm is a thin film made of elastic material (such as rubber or silicone) and is fixed inside the pump head, dividing the pump chamber into a suction chamber and a compression chamber. When the eccentric device rotates to a certain position, the connecting rod pulls the diaphragm to move outward, the volume of the suction chamber increases, the pressure decreases, and the outside gas is drawn into the pump chamber through the one-way valve. When the eccentric device continues to rotate to another position, the connecting rod pushes the diaphragm to move inward, the volume of the suction chamber decreases, the pressure increases, and the gas is discharged from the pump chamber through the one-way valve.

[0056] The pump head is equipped with one-way valves (inlet valve and exhaust valve) to ensure that gas can only flow in one direction. During intake, the inlet valve is open and the exhaust valve is closed; during compression, the exhaust valve is open and the inlet valve is closed. The reciprocating motion of the diaphragm causes negative and positive pressures to be generated periodically in the pump chamber, thereby driving the gas to flow in from the inlet and out from the outlet after compression.

[0057] A differential pressure probe is used to measure the differential pressure at the source point in the bypass air path and feed it back to the control unit; in some embodiments, the source point is located at the front and rear ends of the first buffer, specifically including:

[0058] The first sampling point is located on the air inlet side of the first buffer and is used to monitor the air pressure difference between the sampler inlet and the first buffer.

[0059] The second source point is located between the outlet side of the first buffer and the inlet of the diaphragm pump, and is used to monitor the airflow pressure difference between the first buffer and the diaphragm pump.

[0060] Specifically, the differential pressure probe, through a first and a second sampling point set at the front and rear ends of the first buffer, can accurately measure the airflow pressure difference at corresponding locations. The first sampling point monitors the airflow pressure difference from the sampler inlet to the first buffer, reflecting the pressure change of the gas before entering the buffer; the second sampling point monitors the airflow pressure difference from the first buffer to the diaphragm pump, reflecting the pressure loss of the gas after passing through the buffer. This precise differential pressure data provides key information for the control unit, enabling it to accurately understand the pressure status in the gas path. Compared to systems without specific sampling points or with inaccurate differential pressure monitoring, this solution can obtain more realistic and detailed airflow pressure information, providing a reliable data foundation for subsequent flow control and system adjustment.

[0061] In low-flow mode, the control unit, based on data feedback from the differential pressure probe, can accurately calibrate the ratio between the bypass gas path circulation flow and the actual sampled flow. For example, it can adjust the state of the gas path switching valve or the speed of the diaphragm pump according to changes in differential pressure to ensure that the actual sampled flow is stable within the preset low-flow range. In high-flow mode, differential pressure data helps maintain the stability of the full-flow output. When abnormal fluctuations occur in the differential pressure, the control unit can make timely adjustments to ensure the accuracy of high-flow sampling. Traditional high and low samplers lack effective differential pressure monitoring and feedback mechanisms, making it difficult to achieve such precise flow control. This technical solution, through the setting of differential pressure probes and reasonable source points, enables the sampler to dynamically adjust according to the actual pressure conditions, improving the accuracy and stability of flow control.

[0062] The differential pressure probe monitors the pressure difference changes at the source point in real time, enabling timely detection of abnormalities in the gas path. For example, if the pressure difference at the first source point suddenly increases, it may indicate a blockage at the air inlet or an abnormal increase in the gas source pressure. If the pressure difference at the second source point is abnormal, it may indicate a malfunction in the buffer or diaphragm pump. Upon receiving these abnormal signals, the control unit can quickly take protective measures, such as adjusting the gas path, reducing the motor speed, or issuing an alarm, to avoid equipment damage and safety accidents, thereby reducing equipment damage and maintenance costs caused by abnormalities.

[0063] A control unit is configured to control the diaphragm pump assembly and the bypass air path based on differential pressure data from the source point; in some embodiments, the control unit controlling the diaphragm pump assembly and the bypass air path based on differential pressure data from the source point specifically includes:

[0064] It receives differential pressure data from the differential pressure probe and adjusts the speed of the diaphragm pump motor according to the preset calibration value;

[0065] It works in conjunction with the gas path switching valve to control the switching between high flow and low flow levels.

[0066] Specifically, the control unit receives differential pressure data from the differential pressure probe and adjusts the speed of the diaphragm pump motor according to a preset calibration value. Through this closed-loop control method, the compression and flow rate of the gas can be precisely adjusted, thereby achieving precise control of the sampling flow rate. In low-flow mode, it can ensure that the actual sampling flow rate is stable within the preset low-flow ratio range; in high-flow mode, it can maintain a stable output of the full flow rate, meeting the precise flow requirements of different sampling scenarios. Compared with open-loop control or devices lacking precise feedback adjustment, this control unit can dynamically adjust according to real-time differential pressure data, effectively overcoming the influence of factors such as gas source pressure fluctuations and pipeline resistance changes on the flow rate, greatly improving the accuracy and stability of flow control.

[0067] The control unit is linked with the gas path switching valve to precisely control the switching between high-flow and low-flow levels. When a switching sampling mode is required, the control unit can send commands in a timely and accurate manner to activate the gas path switching valve to the corresponding position, ensuring a smooth gas path switching process. At the same time, during the switching process, the control unit can monitor and fine-tune the gas path status after the switch based on the differential pressure data to ensure the stability of the sampling flow rate after the switch. Manual switching or simple mechanical switching methods are prone to problems such as inaccurate switching and unstable switching processes, which affect the sampling results. The linkage control method of this control unit improves the automation and accuracy of gas path switching, and reduces human operation errors and unstable factors during the switching process.

[0068] A high / low sampler control method based on a bypass air path, specifically including:

[0069] A bypass gas path and a diaphragm pump assembly are provided, wherein the bypass gas path is used for switching between high and low flow sampling, and the diaphragm pump assembly is used for compressing gas and driving gas flow.

[0070] Use a differential pressure probe to measure the differential pressure data at the sampling point in the bypass air path;

[0071] The control unit dynamically adjusts the diaphragm pump assembly and bypass air path based on the differential pressure data fed back by the differential pressure probe.

[0072] In some embodiments, the bypass air path includes a first buffer, a second buffer, a first capillary tube, a second capillary tube, and an air path switching valve. The specific structural design of the bypass air path is as follows:

[0073] When the gas path switching valve is in the low flow position, part of the airflow passes through the air inlet, the first buffer, the diaphragm pump, the second buffer, and the first capillary tube in sequence to circulate to the front end of the first buffer, and the remaining airflow passes through the air inlet, the first buffer, the diaphragm pump, the second buffer, and the second capillary tube in sequence and flows out from the air outlet.

[0074] When the gas path switching valve is in the high flow position, the airflow passes through the inlet, the first buffer, the diaphragm pump, the second buffer, the first capillary tube, and the second capillary tube in sequence and flows out from the outlet.

[0075] A computing device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of any of the above-described high and low sampler control methods based on a bypass air path.

[0076] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of any of the above-described high / low sampler control methods based on a bypass air path.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high / low sampler based on a bypass air path, characterized in that, include: A bypass air path is used for switching between high and low flow sampling; Diaphragm pump assembly, used to compress gas and drive gas flow; Differential pressure probe is used to measure the differential pressure at the source point in the bypass air path and feed it back to the control unit; The control unit is used to control the diaphragm pump assembly and bypass air path based on the differential pressure data from the source point.

2. The high and low sampler based on a bypass air path according to claim 1, characterized in that, The bypass air path includes a first buffer, a second buffer, a first capillary tube, a second capillary tube, and an air path switching valve. The specific structural design of the bypass air path is as follows: When the gas path switching valve is in the low flow position, part of the airflow passes through the air inlet, the first buffer, the diaphragm pump assembly, the second buffer, and the first capillary tube in sequence to circulate to the front end of the first buffer, and the remaining airflow passes through the air inlet, the first buffer, the diaphragm pump assembly, the second buffer, and the second capillary tube in sequence to flow out from the air outlet. When the gas path switching valve is in the high flow position, the airflow passes through the inlet, the first buffer, the diaphragm pump assembly, the second buffer, the first capillary tube, and the second capillary tube in sequence and flows out from the outlet.

3. The high and low sampler based on a bypass air path according to claim 2, characterized in that, The specific ratio of the first capillary tube and the second capillary tube is as follows: The ratio of the inner diameter of the first capillary to the second capillary is 1:2.2, and the ratio of the length of the first capillary to the second capillary is 1:0.

7.

4. The high and low sampler based on a bypass air path according to claim 3, characterized in that, The diaphragm pump assembly includes a motor and a diaphragm pump head. The motor and the diaphragm pump head are mechanically connected. The motor drives the eccentric device to rotate, causing the diaphragm inside the diaphragm pump head to reciprocate, compressing the gas and driving the gas flow.

5. The high and low sampler based on a bypass air path according to claim 4, characterized in that, The source point is located at the front and rear ends of the first buffer, specifically including: The first sampling point is located on the air inlet side of the first buffer and is used to monitor the air pressure difference between the sampler inlet and the first buffer. The second source point is located between the outlet side of the first buffer and the inlet of the diaphragm pump, and is used to monitor the airflow pressure difference between the first buffer and the diaphragm pump.

6. The high and low sampler based on a bypass air path according to claim 5, characterized in that, The control unit controls the diaphragm pump assembly and bypass air path based on the differential pressure data from the source point, specifically including: It receives differential pressure data from the differential pressure probe and adjusts the speed of the diaphragm pump motor according to the preset calibration value; It works in conjunction with the gas path switching valve to control the switching between high flow and low flow levels.

7. A high / low sampler control method based on a bypass air path, characterized in that, Specifically, it includes: A bypass gas path and a diaphragm pump assembly are provided, wherein the bypass gas path is used for switching between high and low flow sampling, and the diaphragm pump assembly is used for compressing gas and driving gas flow. Use a differential pressure probe to measure the differential pressure data at the sampling point in the bypass air path; The control unit dynamically adjusts the diaphragm pump assembly and bypass air path based on the differential pressure data fed back by the differential pressure probe.

8. The high and low sampler control method based on a bypass air path according to claim 7, characterized in that, The bypass air path includes a first buffer, a second buffer, a first capillary tube, a second capillary tube, and an air path switching valve. The specific structural design of the bypass air path is as follows: When the gas path switching valve is in the low flow position, part of the airflow passes through the air inlet, the first buffer, the diaphragm pump assembly, the second buffer, and the first capillary tube in sequence to circulate to the front end of the first buffer, and the remaining airflow passes through the air inlet, the first buffer, the diaphragm pump assembly, the second buffer, and the second capillary tube in sequence to flow out from the air outlet. When the gas path switching valve is in the high flow position, the airflow passes through the inlet, the first buffer, the diaphragm pump assembly, the second buffer, the first capillary tube, and the second capillary tube in sequence and flows out from the outlet.

9. A computing device, characterized in that, The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the high and low sampler control method based on any one of claims 7-8.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the steps of the high and low sampler control method based on a bypass air path as described in any one of claims 7-8.

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