High-temperature sampling device
By introducing a high-temperature sampling pump, pressure detection components, and precision flow control valve into the high-temperature sampling device, combined with gas resistance components and gas replenishment control, the problem of constant flow sampling under high temperature and high humidity conditions was solved, and high-precision gas flow control was achieved.
Patent Information
- Application Number
- CN202520169599.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-24
AI Technical Summary
Existing technologies cannot achieve constant flow sampling in high temperature and high humidity environments. Commonly used mass flow controllers suffer from valve core and seat deformation at high temperatures, leading to decreased sealing and flow control accuracy, thus making it impossible to achieve constant flow sampling.
A high-temperature sampling device, including a sampling tank, gas path components, and a controller, is used. Through a high-temperature sampling pump, pressure detection components, and precision flow regulating valve, combined with gas resistance components and gas replenishment control, stable control of gas flow is achieved, ensuring constant flow sampling in high-temperature and high-humidity environments.
It achieves high-precision constant flow sampling in high temperature and high humidity environments, ensuring the stability and accuracy of gas flow and solving the problem of flow control in high temperature environments.
Smart Images
Figure CN223841571U_ABST
Abstract
Description
Technical Field
[0001] This utility model mainly relates to the field of gas detection equipment technology, specifically a high-temperature sampling device. Background Technology
[0002] In monitoring ambient air and pollutants from fugitive emissions, common sampling methods include instantaneous sampling at the pollution source and constant-flow atmospheric sampling. Instantaneous sampling involves allowing the gas sample to flow freely into the sampling bottle after the sampling valve is opened. Constant-flow sampling, on the other hand, uses a mass flow controller or constant-flow orifice plate to inject gas into the sampling bottle at a designed flow rate. However, current methods cannot support constant-flow sampling in vacuum bottles under high-temperature and high-humidity conditions.
[0003] In high-temperature and high-humidity environments, a common problem is that the pressure of the target gas being sampled fluctuates significantly and unpredictably, making it impossible for constant-flow orifice plates to achieve constant-flow sampling. Furthermore, when commonly used mass flow controllers are used in high-temperature and high-humidity environments, the core components of their precision proportional valves, such as the valve core and seat, may deform at high temperatures. This reduces the precision of the fit between the valve core and seat, affecting the valve's sealing and flow control accuracy, thus limiting their application in such environments. Therefore, how to achieve true constant-flow sampling in high-temperature and high-humidity environments is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0004] To address the technical problems existing in the prior art, this utility model provides a high-temperature sampling device with stable and controllable sampling flow rate, capable of constant flow sampling in high temperature and high humidity environments.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0006] A high-temperature sampling device includes a sampling tank and a gas path assembly. The gas path assembly includes a main gas path pipeline, a sampling inlet branch pipeline, and a supplementary inlet branch pipeline. The main gas path pipeline is equipped with a high-temperature sampling pump and a first pressure detection component. One end of the sampling inlet branch pipeline is connected to the main gas path pipeline, and the other end is connected to the sampling tank. The sampling inlet branch pipeline is equipped with a sampling control valve and a second pressure detection component. One end of the supplementary inlet branch pipeline is connected to the main gas path pipeline, and the other end is connected to an external gas source. The supplementary inlet branch pipeline is equipped with a supplementary gas control valve. The device also includes a controller for controlling the opening and closing of the high-temperature sampling pump, the sampling control valve, and the supplementary gas control valve.
[0007] As a further improvement of this utility model, a first air resistance component is also provided on the main air passage pipe.
[0008] As a further improvement of this utility model: a second air resistance component is provided on the sampling air inlet branch pipe.
[0009] As a further improvement of this utility model, the air replenishment control valve is a precision flow regulating valve.
[0010] As a further improvement of this utility model: the air passage assembly is disposed inside the housing.
[0011] As a further improvement of this utility model: the housing is provided with an air inlet and an exhaust outlet, and one end of the main air passage is connected to the air inlet and the other end is connected to the exhaust outlet.
[0012] As a further improvement of this utility model: the housing is also provided with a flow compensation port, and the supplementary air intake branch pipe is connected to an external air source through the flow compensation port.
[0013] As a further improvement of this utility model, a signal antenna is also provided on the housing.
[0014] As a further improvement of this utility model, a positioning signal antenna is also provided on the housing.
[0015] As a further improvement of this utility model, a power interface is also provided on the housing.
[0016] Compared with the prior art, the advantages of this utility model are:
[0017] The high-temperature sampling device of this invention, upon receiving a constant-flow sampling command, controls the high-temperature sampling pump to start. The high-temperature sampling pump with controllable flow rate extracts gas from the sampling port according to the pre-set sampling flow rate requirements, causing the first pressure detection component to reach the target value. Subsequently, the controller controls the sampling control valve to open, and the sampling tank automatically begins to inject samples. At this time, the pressure value detected by the first pressure detection component will slowly decrease, while the pressure detected by the second pressure detection component will slowly increase. To ensure the stability of the sampling flow rate, the controller controls the pumping rate of the high-temperature sampling pump with controllable flow rate and the opening of the gas replenishment control valve to ensure the stability of the pressure difference between the first and second pressure detection components, achieving high-precision flow rate change regulation, thereby realizing true constant-flow sampling in high-temperature and high-humidity environments. Attached Figure Description
[0018] Figure 1 This is a front view of the present invention in a specific embodiment.
[0019] Figure 2 This is a side view of the present invention in a specific embodiment.
[0020] Figure 3 yes Figure 2 Sectional view at point AA.
[0021] Legend:
[0022] 1. Sampling tank; 2. Gas path assembly; 21. Main gas path pipeline; 22. Sampling inlet branch pipeline; 23. Supplementary inlet branch pipeline; 3. High-temperature sampling pump; 4. First pressure detection assembly; 5. Sampling control valve; 6. Second pressure detection assembly; 7. Supplementary gas control valve; 8. First gas resistance assembly; 9. Second gas resistance assembly; 10. Housing; 101. Air inlet; 102. Exhaust outlet; 103. Flow compensation port; 11. Signal antenna; 12. Positioning signal antenna; 13. Power interface. Detailed Implementation
[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0024] like Figures 1 to 3 As shown, this embodiment discloses a high-temperature sampling device, including a sampling tank 1 and a gas path assembly 2. The gas path assembly 2 includes a main gas path pipe 21, a sampling inlet branch pipe 22, and a supplementary inlet branch pipe 23. The main gas path pipe 21 is equipped with a high-temperature sampling pump 3 and a first pressure detection component 4. One end of the sampling inlet branch pipe 22 is connected to the main gas path pipe 21, and the other end is connected to the sampling tank 1. The sampling inlet branch pipe 22 is equipped with a sampling control valve 5 and a second pressure detection component 6. One end of the supplementary inlet branch pipe 23 is connected to the main gas path pipe 21, and the other end is connected to an external gas source. The supplementary inlet branch pipe 23 is equipped with a supplementary gas control valve 7 and also includes a controller. The controller is used to control the opening and closing of the high-temperature sampling pump 3, the sampling control valve 5, and the supplementary gas control valve 7.
[0025] In this embodiment, when the high-temperature sampling device receives a constant flow sampling command, the controller controls the high-temperature sampling pump 3 to start. The high-temperature sampling pump 3, with a controllable flow rate, extracts gas from the sampling port according to the preset sampling flow rate requirements, so that the first pressure detection component 4 reaches the target value. Subsequently, the controller controls the sampling control valve 5 to open, and the sampling tank 1 automatically starts to inject samples. At this time, the pressure value detected by the first pressure detection component 4 will slowly decrease, and the pressure detected by the second pressure detection component 6 will slowly increase. In order to ensure the stability of the sampling flow rate, the controller controls the pumping rate of the high-temperature sampling pump 3 with a controllable flow rate and the opening of the gas replenishment control valve 7 to ensure the stability of the pressure difference between the first pressure detection component 4 and the second pressure detection component 6, thereby achieving high-precision flow rate change adjustment and realizing true constant flow sampling in a high-temperature and high-humidity environment.
[0026] In this embodiment, a first gas resistance component 8 is also provided on the main gas pipeline 21, and a second gas resistance component 9 is provided on the sampling inlet branch pipeline 22. By setting the first gas resistance component 8 and the second gas resistance component 9, the flow rate of gas in the gas pipeline can be adjusted. The pressure in the gas pipeline may be unstable due to factors such as fluctuations in the gas source pressure and the start and stop of the gas-using equipment. The gas resistance can play a role in stabilizing the pressure.
[0027] In this embodiment, the gas supply control valve 7 is a precision flow regulating valve. Since it is difficult for the high-temperature sampling pump 3 with controllable flow rate to achieve high-precision flow rate change regulation, the pressure of the main gas pipeline 21 cannot be continuously regulated, which may cause large fluctuations in the sampling flow rate in the vacuum sampling tank 1. By setting a precision flow regulating valve in the gas path assembly 2, the input low-temperature gas source can be regulated, which can solve the defect of limited accuracy in flow rate regulation of the high-temperature sampling pump 3 with controllable flow rate.
[0028] In this embodiment, the air path assembly 2 is disposed inside the housing 10. The housing 10 is provided with an air inlet 101 and an exhaust outlet 102. One end of the main air path pipe 21 is connected to the air inlet 101, and the other end is connected to the exhaust outlet 102. The housing 10 is also provided with a flow compensation port 103. The supplementary air intake branch pipe 23 is connected to an external air source through the flow compensation port 103.
[0029] In this embodiment, the housing 10 is also equipped with a signal antenna 11 and a positioning signal antenna 12. The signal antenna 11 is used for real-time data transmission and remote command issuance, realizing remote triggering and real-time status query functions. The device can be placed at the sampling point for a long time. When a complaint is received or an abnormal value is detected, a sampling command is remotely issued to collect gas samples. The positioning antenna 12 is used to obtain the device's location information to determine whether the device is at the correct sampling point and whether it has been moved.
[0030] In this embodiment, the housing 10 is also provided with a power interface 13, through which the high-temperature sampling device is powered.
[0031] Working principle: The high-temperature sampling device in this embodiment has the following three processes in practical applications:
[0032] 1. Equipment Leak Detection Process
[0033] First, seal the air inlet 101. At this time, both the sampling control valve 5 and the gas replenishment control valve 7 are closed. Control the high-temperature sampling pump 3 to start the vacuuming operation. After a period of time, when the first pressure detection component 4 reaches the predetermined value, it indicates that the pipeline is airtight. If it does not reach the predetermined value, it indicates that there is a leak and the pipeline needs to be checked.
[0034] 2. Main gas pipeline 21 pre-flushing process
[0035] Connect the air inlet 101 to the pollution source, control the sampling control valve 5 and the gas replenishment control valve 7 to be closed, and control the high-temperature sampling pump 3 to be turned on for a period of time to replace the gas in the main gas pipeline 21 and pre-clean the pipeline with the pollution source gas.
[0036] 3. Sampling process
[0037] After the main gas pipeline 21 is pre-washed, the controller controls the sampling control valve 5 to open, connecting the sampling tank 1 with the main gas pipeline 21. At this time, the sampling tank 1 is in a vacuum state. Under the action of pressure difference, gas will enter the sampling tank 1. The pressure in the sampling tank 1 is detected in real time by the second pressure detection component 6, and the pressure is buffered by the second gas resistance component 9 to ensure a stable pressure difference at both ends. Thus, the gas flow rate entering the sampling tank 1 will be a constant value. The pressure change in the main gas pipeline 21 is monitored in real time by the first pressure detection component 4, and the pressure is buffered by the first gas resistance component 8. The controller adjusts the opening of the gas replenishment control valve 7 and the pumping speed of the high-temperature sampling pump 3 to ensure a stable pressure difference at both ends of the second gas resistance component 9, so that the gas entering the sampling tank 1 has a constant flow rate.
[0038] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should be considered within its protection scope.
Claims
1. A high-temperature sampling device, characterized in that, The system includes a sampling tank (1) and a gas path assembly (2). The gas path assembly (2) includes a main gas path pipeline (21), a sampling inlet branch pipeline (22), and a supplementary inlet branch pipeline (23). The main gas path pipeline (21) is equipped with a high-temperature sampling pump (3) and a first pressure detection assembly (4). One end of the sampling inlet branch pipeline (22) is connected to the main gas path pipeline (21), and the other end is connected to the sampling tank (1). The sampling inlet branch pipeline (22) is equipped with a sampling control valve (5) and a second pressure detection assembly (6). One end of the supplementary inlet branch pipeline (23) is connected to the main gas path pipeline (21), and the other end is connected to an external gas source. The supplementary inlet branch pipeline (23) is equipped with a supplementary gas control valve (7). The system also includes a controller, which is used to control the opening and closing of the high-temperature sampling pump (3), the sampling control valve (5), and the supplementary gas control valve (7).
2. The high-temperature sampling device according to claim 1, characterized in that, The main gas pipeline (21) is also equipped with a first gas resistance component (8).
3. The high-temperature sampling device according to claim 1, characterized in that, The sampling air intake branch pipe (22) is equipped with a second air resistance component (9).
4. The high-temperature sampling device according to claim 1, characterized in that, The air replenishment control valve (7) is a precision flow regulating valve.
5. The high-temperature sampling device according to claim 1, characterized in that, The air passage assembly (2) is disposed inside the housing (10).
6. The high-temperature sampling device according to claim 5, characterized in that, The housing (10) is provided with an air inlet (101) and an exhaust outlet (102). One end of the main air passage pipe (21) is connected to the air inlet (101), and the other end is connected to the exhaust outlet (102).
7. The high-temperature sampling device according to claim 5, characterized in that, The housing (10) is also provided with a flow compensation port (103), and the supplementary air intake branch pipe (23) is connected to an external air source through the flow compensation port (103).
8. The high-temperature sampling device according to claim 5, characterized in that, The housing (10) is also equipped with a signal antenna (11).
9. The high-temperature sampling device according to claim 5, characterized in that, The housing (10) is also equipped with a positioning signal antenna (12).
10. The high-temperature sampling device according to any one of claims 5 to 9, characterized in that, The housing (10) is also provided with a power interface (13).