CN219715405U - Gas detection decompression constant flow device - Google Patents
Gas detection decompression constant flow device Download PDFInfo
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- CN219715405U CN219715405U CN202321071893.XU CN202321071893U CN219715405U CN 219715405 U CN219715405 U CN 219715405U CN 202321071893 U CN202321071893 U CN 202321071893U CN 219715405 U CN219715405 U CN 219715405U
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- 238000001514 detection method Methods 0.000 title claims abstract description 83
- 230000006837 decompression Effects 0.000 title claims abstract description 12
- 239000007789 gas Substances 0.000 description 41
- 230000005856 abnormality Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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Abstract
The utility model relates to a gas detection decompression constant flow device, which comprises a detection pipeline, wherein a proportional valve, a pressure sensor and a detection sensor are sequentially arranged along the gas flowing direction of the detection pipeline, an air outlet throttling ring is arranged on the inner wall of the detection pipeline, and a control circuit is arranged outside the detection pipeline; the pressure sensor, the proportional valve and the detection sensor are all electrically connected with the control circuit, and the control circuit is used for receiving the numerical value of the pressure sensor and controlling the opening and closing degree of the proportional valve according to the numerical value, and the detection sensor is positioned between the air outlet throttling ring and the air outlet end of the detection pipeline. According to the utility model, the pressure of the gas flowing through the front of the detection sensor is controlled in a pressure detection feedback mode, and the pressure of the gas between the proportional valve and the air outlet throttling ring is kept constant, so that the flow flowing through the detection sensor is ensured to be constant, and the accuracy of a detection result is improved.
Description
Technical Field
The utility model relates to the field of gas detection technology, in particular to a decompression constant flow device for gas detection.
Background
In recent years, with the development of economy, the quality of life of people is gradually improved. But with this is a gradual increase in environmental problems, especially air pollution. Industrial waste gas, automobile exhaust and the like are always main sources of air pollution.
In the industrial production process, the generated waste gas is generally subjected to purification treatment, toxic and harmful components are removed, and the purified gas is discharged into the atmosphere. Even if the purified gas is detected by the gas composition and concentration, it is usually detected by a related sensor to determine whether the purified gas meets the related emission standard. However, in different pipelines, the gas flow rate is still under the pressure of the gas at the front end of the pipeline, so that the gas flow rate is inconsistent when flowing through the position of the sensor, and the accuracy of the detection result is reduced.
For the related art, there are defects that the air pressures at different positions in the pipeline are different, so that the flow rate flowing through the sensor is not constant, and the measurement result of the sensor is inaccurate.
Disclosure of Invention
In order to improve the accuracy of a detection result of a sensor, the utility model provides a gas detection decompression constant flow device.
The utility model provides a gas detection decompression constant flow device, which adopts the following technical scheme:
the gas detection decompression constant flow device comprises a detection pipeline, wherein a proportional valve, a pressure sensor and a detection sensor are sequentially arranged along the gas flowing direction of the detection pipeline, an air outlet throttling ring is arranged in the detection pipeline, and a control circuit is arranged outside the detection pipeline; the pressure sensor, the proportional valve and the detection sensor are all electrically connected with the control circuit, the control circuit is used for receiving the numerical value of the pressure sensor and controlling the opening and closing degree of the proportional valve according to the numerical value, and the detection sensor is located between the air outlet throttling ring and the air outlet end of the detection pipeline.
Through adopting above-mentioned technical scheme, will give vent to anger the choke ring setting and be located between proportional valve and the detection sensor of detecting the pipeline to through pressure sensor's detection numerical value, let control circuit can in time adjust the degree of opening and shutting of proportional valve through the PID algorithm, make the pressure between proportional valve and the orifice of giving vent to anger keep stable, and then keep the flow rate of gas stable in the orifice of giving vent to anger, finally make the gas velocity of flow that flows through the detection sensor stable, improved the accuracy of testing result. And the air pressure between the air outlet throttling ring and the proportional valve is controlled by the opening and closing degree of the proportional valve, and even if the air pressure entering the proportional valve is changed, the air pressure can be kept stable by changing the opening and closing degree of the proportional valve, so that the constant flow speed around the detection sensor is realized.
Optionally, an air inlet throttling ring is arranged in the detection pipeline, and the air inlet throttling ring is located between the air inlet end of the detection pipeline and the proportional valve.
Through adopting above-mentioned technical scheme, the throttle ring that admits air sets up in the air inlet anterior segment of proportional valve, and the throttle ring that admits air has reduced the area when gas gets into the detection pipeline. When the detection pipeline is connected into a gas pipeline with higher pressure, the air inlet throttling ring can block most of the gas pressure, so that the air pressure entering the proportional regulating valve is reduced, the impact force of the higher gas directly against the proportional valve is reduced, the controllable range of the proportional valve is increased, and the application range of the proportional valve is increased.
Optionally, the detection pipeline is further provided with a shutoff valve, the shutoff valve is located between the air inlet end of the detection pipeline and the air inlet throttling ring, and the shutoff valve is electrically connected with the control circuit.
By adopting the technical scheme, when the detection sensor detects data abnormality, the control circuit can be used for closing the shutoff valve, so that the detection pipeline is disconnected, and the data abnormality is analyzed and processed in time.
In summary, the present utility model includes at least one of the following beneficial technical effects:
1. through the mode of pressure detection feedback, even when the input atmospheric pressure changes, also can keep the atmospheric pressure between proportional valve and the throttle ring that gives vent to anger for the velocity of flow of the gaseous constant of follow throttle ring that gives vent to anger, and then ensure the velocity of flow around the sensor constant, increase the testing result accuracy of detecting the sensor.
2. Impact force of gas comparison regulation is reduced through the air inlet throttling ring, and the application range of the proportional valve is increased.
Drawings
Fig. 1 is a schematic diagram of a structure of a device for detecting pressure-reducing constant flow of gas according to an embodiment of the present utility model.
Reference numerals illustrate: 1. detecting a pipeline; 11. an air outlet throttling ring; 12. an intake throttle ring; 2. a proportional valve; 3. a pressure sensor; 4. a detection sensor; 5. a control circuit; 6. the valve is shut off.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings.
The utility model discloses a gas detection decompression constant flow device. Referring to fig. 1, the gas detection decompression constant flow device includes a detection pipe 1, a proportional valve 2, a pressure sensor 3, a detection sensor 4, a control circuit 5, and a shutoff valve 6. The shut-off valve 6, the proportional valve 2, the pressure sensor 3 and the detection sensor 4 are sequentially arranged on the detection pipeline 1 along the gas flowing direction of the detection pipeline 1, and the shut-off valve 6, the proportional valve 2, the pressure sensor 3 and the detection sensor 4 are electrically connected with the control circuit 5.
In the use process, whether the pressure value detected by the pressure sensor 3 is in a stable state or not is obtained and analyzed through the control circuit 5, and the pressure value is regulated and controlled in time through a PID algorithm. If the pressure value detected by the pressure sensor 3 is unstable, the opening and closing degree control is performed through the proportional valve 2 quickly, so that the pressure value detected by the pressure sensor 3 is in a stable state. When the pressure value detected by the pressure sensor 3 is in a stable state, the flow velocity of the gas flowing out of the gas outlet throttling ring 11 is constant, so that the flow velocity of the detection sensor 4 around the inside of the detection pipeline 1 is constant, and the final detection result of the detection sensor 4 is ensured to have higher accuracy.
An air outlet throttling ring 11 and an air inlet throttling ring 12 are arranged in the detection pipeline 1, the air outlet throttling ring 11 is arranged between the pressure sensor 3 and the detection sensor 4, and the air inlet throttling ring 12 is arranged between the shutoff valve 6 and the proportional valve 2. The air outlet throttling ring 11 and the air inlet throttling ring 12 can be directly fixed at the end parts of a plurality of different pipeline sections forming the detection pipeline 1, and then the adjacent pipeline sections are connected through flanges, so that the air outlet throttling ring 11 and the air inlet throttling ring 12 are fixed. The air outlet throttling ring 11 and the air inlet throttling ring 12 can also be directly fixed on the inner wall of the detection pipeline 1.
In this embodiment, the air outlet throttling ring 11 and the air inlet throttling ring 12 are fixed on the inner wall of the detection pipeline 1. And a small hole for gas circulation is arranged in the middle of the gas outlet throttling ring 11. The air outlet restrictor 11 slows the flow of air to facilitate the detection of air pressure by the pressure sensor 3.
Directly changing the proportional valve 2 is the gas pressure and gas flow rate through the pressure sensor 3. Therefore, the pressure of the gas flowing out of the proportional valve 2 is detected by the pressure sensor 3, and is analyzed and judged by the control circuit 5. When the pressure detected by the pressure sensor 3 gradually decreases, the control circuit 5 controls the opening degree of the proportional valve 2 to increase so that the amount of gas introduced increases, thereby gradually increasing the gas pressure. When the pressure detected by the pressure sensor 3 gradually increases, the control circuit 5 controls the opening degree of the proportional valve 2 to decrease so that the amount of gas introduced decreases, thereby gradually decreasing the gas pressure. And finally, the air pressure between the proportional valve 2 and the air outlet throttling ring 11 is kept stable, so that the flow rate of the air flowing out of the air outlet throttling ring 11 is constant, namely, the flow rate of the air around the detection sensor 4 is constant, and the detection result of the detection sensor 4 is ensured to have higher accuracy.
The middle of the air inlet throttle ring 12 is also provided with a small hole through which air flows. The small holes in the inlet throttle member 12 directly reduce the cross-sectional area of the gas flow at the current location. When the gas in front of the line in which the intake throttle ring 12 is located has a large pressure, the intake throttle ring 12 blocks most of the gas flow to reduce the gas entering the proportional valve 2. After passing through the small hole of the air inlet throttling ring 12, the air enters the detection pipeline 1 between the air inlet throttling ring 12 and the proportional valve 2, the cross section area of the air contact is increased, and the pressure of the air comparison valve 2 is reduced. In the use adjusting range of the proportional valve 2, the application range of the proportional valve 2 is further increased by arranging the air inlet throttling rings 12 with different apertures, so that the pressure regulation and control are better carried out.
The shut-off valve 6 is located between the air inlet end of the detection pipe 1 and the air inlet throttle ring 12, and when the detection sensor 4 detects a numerical abnormality, the shut-off valve 6 is controlled to be closed by the control circuit 5, thereby shutting off the entire detection pipe 1.
The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.
Claims (3)
1. The utility model provides a gaseous decompression constant current device that detects which characterized in that: the gas-outlet flow-rate control device comprises a detection pipeline (1), wherein a proportional valve (2), a pressure sensor (3) and a detection sensor (4) are sequentially arranged along the gas flow direction of the detection pipeline (1), a gas-outlet flow-rate control ring (11) is arranged in the detection pipeline (1), and a control circuit (5) is arranged outside the detection pipeline (1); the pressure sensor (3), the proportional valve (2) and the detection sensor (4) are electrically connected with the control circuit (5), the control circuit (5) is used for receiving the numerical value of the pressure sensor (3) and controlling the opening and closing degree of the proportional valve (2) according to the numerical value, and the detection sensor (4) is located between the air outlet throttling ring (11) and the air outlet end of the detection pipeline (1).
2. The gas detection decompression constant flow device according to claim 1, wherein: an air inlet throttling ring (12) is arranged in the detection pipeline (1), and the air inlet throttling ring (12) is located between the air inlet end of the detection pipeline (1) and the proportional valve (2).
3. The gas detection decompression constant flow device according to claim 2, wherein: the detection pipeline (1) is further provided with a shut-off valve (6), the shut-off valve (6) is located between the air inlet end of the detection pipeline (1) and the air inlet throttling ring (12), and the shut-off valve (6) is electrically connected with the control circuit (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321071893.XU CN219715405U (en) | 2023-05-05 | 2023-05-05 | Gas detection decompression constant flow device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321071893.XU CN219715405U (en) | 2023-05-05 | 2023-05-05 | Gas detection decompression constant flow device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219715405U true CN219715405U (en) | 2023-09-19 |
Family
ID=88003570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321071893.XU Active CN219715405U (en) | 2023-05-05 | 2023-05-05 | Gas detection decompression constant flow device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219715405U (en) |
-
2023
- 2023-05-05 CN CN202321071893.XU patent/CN219715405U/en active Active
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