Airflow detection device

Abstract

The present disclosure relates to an air flow detection device, which includes a base and a fixed tube vertically arranged on the base. Inside the fixed tube, there is a slider that can slide up and down along the inner wall of the fixed tube, and a sensor is arranged below the slider and can detect the height of the slider. The slider divides the inside of the fixed tube into a first air chamber and a second air chamber that are not connected to each other from bottom to top. The first air chamber is connected to a first air inlet pipeline, and a plurality of exhaust pipelines are sequentially connected along the axial direction on the tube wall of the fixed tube. Through the above technical solution, the first air inlet pipeline is connected to the airtightness failure point. The gas in the first air chamber increases, driving the slider to move upward. The sensor judges the height of the slider. After the slider passes through a certain exhaust pipeline, the exhaust pipeline is opened. The first air inlet pipeline introduces gas and the exhaust pipeline discharges gas. The difference between the intake air volume and the exhaust air volume drives the slider to move upward. When the intake air volume and the exhaust air volume reach equilibrium, the height of the slider remains unchanged. The air leakage volume is judged by the height when the slider stops.

Description

Technical Field

[0001] The present disclosure relates to the field of gases, and more particularly, to an air flow detection device. Background Art

[0002] Pneumatic solenoid valves play a crucial role in industrial machinery. After long-term use, pneumatic solenoid valves may experience air leakage or poor sealing. When judging the airtightness failure of a pneumatic solenoid valve, only the human ear and skin can be used to perceive the degree of the failure. Since the air leakage volume caused by the airtightness failure is small, the manual judgment is inaccurate, it is difficult to accurately judge the degree of the failure, and it is also difficult to formulate failure judgment criteria and failure quantification indicators. Summary of the Invention

[0003] The purpose of the present disclosure is to provide an air flow detection device to solve the problem that it is difficult to accurately judge the degree of failure when a pneumatic solenoid valve has an airtightness failure in the related art.

[0004] To achieve the above purpose, the present disclosure provides an air flow detection device, including a base and a fixed tube vertically arranged on the base. Inside the fixed tube, there is a slider that can slide up and down along the inner wall of the fixed tube, and a sensor arranged below the slider and capable of detecting the height of the slider. The slider divides the inside of the fixed tube into a first air chamber and a second air chamber that are not connected to each other from bottom to top. The first air chamber is connected to a first intake pipeline, and a plurality of exhaust pipelines are sequentially connected in the axial direction of the tube wall of the fixed tube, and an electromagnetic valve is arranged on each exhaust pipeline.

[0005] Optionally, the diameters of the plurality of exhaust pipelines increase sequentially from bottom to top.

[0006] Optionally, a flow distribution plate perpendicular to the air flow direction is arranged in the first air chamber. The flow distribution plate is provided with densely distributed flow distribution holes for buffering the gas passing through the flow distribution plate, and the first intake pipeline is connected below the flow distribution plate.

[0007] Optionally, the sensor is embedded in the flow distribution plate.

[0008] Optionally, annular first limiting platforms and second limiting platforms are respectively arranged at both ends of the movement track of the slider inside the fixed tube. Among them, the second limiting platform is arranged above the first limiting platform, and the flow distribution plate is arranged below the first limiting platform.

[0009] Optionally, the first limiting platform and the flow distribution plate are arranged at intervals, and the second limiting platform and the top of the fixed tube are arranged at intervals.

[0010] Optionally, the roughness of the inner wall of the fixed tube is less than the roughness of the surface of the slider.

[0011] Optionally, the fixed pipe and the base are integrally provided by welding.

[0012] Optionally, a second intake pipe is connected to the top of the fixed pipe, and pressure relief pipes are respectively bypassed to the first intake pipe and the second intake pipe.

[0013] Optionally, electromagnetic valves are respectively provided on the first intake pipe, the second intake pipe, and the pressure relief pipe.

[0014] Through the above technical solution, the first intake pipe of the above airflow detection device is connected to the pneumatic solenoid valve with an airtightness failure, and the gas will enter the first air chamber through the first intake pipe. Since the first air chamber and the second air chamber are not connected to each other, the leaked gas will continuously enter the first air chamber. The gas in the first air chamber continuously increases to drive the slider to move upward along the inner wall. The detection device can judge the height where the slider is located. When the detection device detects that the slider passes through a certain exhaust pipe, it opens the exhaust pipe. At this time, gas is introduced into the first intake pipe and the exhaust pipe continuously discharges gas. The difference between the intake volume and the exhaust volume further drives the slider to move upward. When the intake volume and the exhaust volume reach equilibrium, the height of the slider remains unchanged. The air leakage volume is judged by the height at which the slider stops. The higher the height of the slider, the greater the air leakage volume. Further, a quantitative index for the airtightness failure is formulated based on the air leakage volume corresponding to different heights at which the slider stops.

[0015] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. They are used to explain the present disclosure together with the following specific implementation, but do not constitute a limitation to the present disclosure. In the drawings:

[0017] Figure 1 is a schematic structural diagram of an airflow automatic detection device provided by an exemplary embodiment of the present disclosure.

[0018] DESCRIPTION OF THE REFERENCE NUMERALS

[0019] 1 - Base, 2 - Fixed pipe, 21 - First air chamber, 22 - Second air chamber, 3 - Slider, 31 - First limiting platform, 32 - Second limiting platform, 4 - Sensor, 5 - Exhaust pipe, 51 - First intake pipe, 52 - Second intake pipe, 53 - Pressure relief pipe, 6 - Flow distribution plate, 7 - Gas buffer zone. DETAILED DESCRIPTION

[0020] The following will describe in detail the specific embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustrating and explaining the present disclosure, and are not used to limit the present disclosure.

[0021] In the present disclosure, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" generally refer to the orientation of the relevant components in the actual use state, and specifically, reference may be made to Figure 1 the drawing direction. "Inner and outer" refer to the inside and outside of the contour of the corresponding component. In addition, when the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The terms "first", "second", etc. used in the present disclosure are used to distinguish one element from another, and do not have sequence and importance.

[0022] As Figure 1 shown, the present disclosure provides an air flow detection device, which includes a base 1 and a fixed tube 2 vertically arranged on the base 1. Inside the fixed tube 2, there is a slider 3 that can slide up and down along the inner wall of the fixed tube 2, and a sensor 4 arranged below the slider 3 and capable of detecting the height of the slider 3. The slider 3 divides the inside of the fixed tube 2 into a first air chamber 21 and a second air chamber 22 that are not connected to each other from bottom to top. The first air chamber 21 is connected to a first air inlet pipeline 51. Along the axial direction, a plurality of exhaust pipelines 5 are sequentially communicated on the pipe wall of the fixed tube 2, and an electromagnetic valve is arranged on each exhaust pipeline 5. Here, the height of the slider 3 can refer to its absolute height or the distance between it and the sensor 4, and the absolute height can be indirectly obtained through the distance between the slider 3 and the sensor 4 and the height of the sensor 4 itself.

[0023] Through the above technical solution, after connecting the first air inlet pipeline 51 of the above air flow detection device to a pneumatic electromagnetic valve with an airtightness failure, the gas will enter the first air chamber 21 through the first air inlet pipeline 51. Since the first air chamber 21 and the second air chamber 22 are not connected to each other, the gas leaked from the faulty pneumatic electromagnetic valve will continuously enter the first air chamber 21. The gas in the first air chamber 21 continuously increases to drive the slider 3 to move upward along the inner wall of the fixed tube 2. The sensor 4 can judge the height where the slider 3 is located. After the sensor 4 detects that the slider 3 passes through a certain exhaust pipeline 5, it opens the electromagnetic valve on the exhaust pipeline 5. At this time, the gas is introduced through the first air inlet pipeline 51 and the opened exhaust pipeline 5 continuously discharges the gas. The difference between the intake air volume and the exhaust air volume further drives the slider 3 to move upward. When the intake air volume and the exhaust air volume reach equilibrium, the height of the slider 3 remains unchanged. The air leakage amount of the electromagnetic valve to be measured is judged by the height at which the slider 3 stops. The higher the height of the slider 3, the greater the air leakage amount. Further, a quantitative index for airtightness failure is formulated based on the air leakage amounts corresponding to different heights at which the slider 3 stops.

[0024] According to some embodiments, the diameters of the multiple exhaust gas pipelines 5 can gradually increase from bottom to top. The increase in diameter can increase the exhaust gas volume of the corresponding exhaust gas pipeline 5. In this way, when the slider 3 gradually moves upward, the upward movement speed of the slider 3 will gradually decrease due to the increasing exhaust gas volume, and the gradually increasing diameter can make the difference between the corresponding intake gas volume and exhaust gas volume between two adjacent exhaust gas pipelines 5 gradually increase, effectively controlling the height of the above-mentioned airflow detection device. When the slider 3 moves downward, the diameter of the exhaust gas pipeline 5 gradually decreases, and the descending speed of the slider 3 gradually decreases, reducing the impact. Optionally, in addition to gradually increasing the diameter of the exhaust gas pipeline 5, the number of exhaust gas pipelines 5 can also be increased to achieve the same effect.

[0025] Meanwhile, a solenoid valve is provided on the exhaust gas pipeline 5 to allow the exhaust gas pipeline 5 to be opened or closed at any time to adjust the exhaust gas volume of the above-mentioned airflow detection device. When the sensor 4 detects that the slider 3 has moved upward past a certain exhaust gas pipeline 5, it will open that exhaust gas pipeline 5. When a certain exhaust gas pipeline 5 is opened, the previously opened exhaust gas pipeline 5 below it can be selected to be closed to avoid the unclear movement of the slider 3 caused by excessive exhaust gas volume. During the downward movement of the slider 3, the exhaust gas pipelines 5 can be closed one by one from top to bottom to prevent external impurities from blocking the exhaust gas pipelines or entering the fixed pipe 2 and affecting the up and down sliding of the slider 3.

[0026] The gas will enter the first air chamber 21 through the first intake gas pipeline 51. When the gas flow rate is too fast or the gas volume is too large, the slider 3 will abnormally rise and fall due to the impact of the instantaneous airflow, resulting in abnormal detection results of the above-mentioned airflow detection device. At this time, a flow distribution plate 6 perpendicular to the airflow direction can be provided in the first air chamber 21. The flow distribution plate 6 can be provided with densely distributed flow distribution holes for buffering the gas passing through the flow distribution plate 6. The first intake gas pipeline 51 is connected below the flow distribution plate 6. In this way, the gas introduced by the first intake gas pipeline will pass through the flow distribution plate 6, and the flow distribution plate 6 can effectively buffer the airflow to ensure the smooth movement of the slider 3. The flow distribution plate 6 divides the first air chamber 21 into two spaces up and down, and the upper and lower spaces can store and buffer the airflow to avoid the impact of the airflow on the slider 3.

[0027] The sensor 4 can be embedded in the flow distribution plate 6. Refer to Figure 1 , the sensor 4 needs to detect the height corresponding to the slider 3 in real time. By embedding the sensor 4 on the flow distribution plate 6, the sensor 4 can detect the height of the slider 3 in real time, so as to determine which exhaust gas pipeline 5 should be opened.

[0028] In the present disclosure, annular first limiting platforms 31 and second limiting platforms 32 may be respectively arranged at both ends of the movement track of the slider 3 inside the fixed pipe 2. Among them, the second limiting platform 32 is arranged above the first limiting platform 31, and the flow distribution plate 6 is arranged below the first limiting platform 31. The slider 3 can rest on the first limiting platform 31. The first limiting platform 31 serves as the lowest position, i.e., the initial position, of the slider 3. The first limiting platform 31 is arranged above the sensor 4, which can prevent the slider 3 from colliding with the sensor 4 during the falling-back process. The second limiting platform 32 serves as the highest position for the upward movement of the slider 3, preventing the slider 3 from moving upward by too large a distance.

[0029] Further, the first limiting platform 31 and the flow distribution plate 6 are arranged at intervals, and the second limiting platform 32 and the top of the fixed pipe 2 are arranged at intervals. In this way, a gas buffer zone 7 is formed between the flow distribution plate 6 and the first limiting platform 31, and a gas buffer zone 7 is formed between the upper part of the second limiting platform 32 and the top of the fixed pipe 2. The gas buffer zone 7 buffers and compresses the gas in the second air chamber 22 during the upward movement of the slider 3 and the gas in the first air chamber 21 during the falling-back process of the slider 3, preventing the slider 3 from impacting the first limiting platform 31 or the second limiting platform 32 and causing damage to the first limiting platform 31, the second limiting platform 32 or the slider 3.

[0030] In addition, the roughness of the inner wall of the fixed pipe 2 may be less than the roughness of the surface of the slider 3. In this way, the inner wall of the fixed pipe 2 will not hinder the up-and-down sliding of the slider 3, ensuring the accuracy of the above-mentioned air flow detection device.

[0031] The fixed pipe 2 and the base 1 may be integrally formed by welding. The welding has a better airtightness effect to ensure the airtightness of the first air chamber 21. The welding connection has a high strength, increasing the service life of the above-mentioned device.

[0032] In the embodiment of the present disclosure, a second air inlet pipeline 52 may be connected to the top of the fixed pipe 2, and a pressure relief pipeline 53 may be connected in parallel to the first air inlet pipeline 51 and the second air inlet pipeline 52 respectively. After the above-mentioned device is detected, the slider 3 needs to fall back to the initial position from the height at which it stops. At this time, without the influence of external gas, the downward movement of the slider 3 will be relatively slow. Gas can be introduced into the second air inlet pipeline 52 to assist the slider 3 in falling back. The pressure relief pipeline 53 located on the second air inlet pipeline can be opened when the slider 3 moves upward and exceeds the uppermost exhaust pipeline 5, helping to discharge the gas in the second air chamber 22 and balance the gas pressure in the second air chamber 22. The pressure relief pipeline 53 located on the first air inlet pipeline can be opened when the slider 3 falls back, helping to discharge the gas in the first air chamber 21 and balance the gas pressure in the first air chamber 21, facilitating the falling-back of the slider 3.

[0033] Solenoid valves may be respectively provided on the first intake pipeline 51, the second intake pipeline, and the pressure relief pipeline 53. The provision of solenoid valves enables the first intake pipeline 51, the second intake pipeline, and the pressure relief pipeline 53 to be opened or closed at any time. After the solenoid valves are closed, it is possible to prevent external impurities from clogging the corresponding pipelines or entering the inside of the fixed pipe 2, thereby affecting the up and down sliding of the slider 3.

[0034] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept scope of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0035] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0036] Furthermore, any combination can be made among various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. An air flow detection device for detecting the air tightness of a pneumatic solenoid valve, characterized in that, the air flow detection device includes a base and a fixed pipe vertically arranged on the base. Inside the fixed pipe, there is a slider that can slide up and down along the inner wall of the fixed pipe, and a sensor arranged below the slider and capable of detecting the height of the slider. The slider divides the inside of the fixed pipe into a first air chamber and a second air chamber that are not connected to each other from bottom to top. The first air chamber is connected with a first air inlet pipeline, and the first air inlet pipeline is used to connect to the pneumatic solenoid valve. The pipe wall of the fixed pipe is sequentially connected with a plurality of exhaust pipelines in the axial direction, and a solenoid valve is arranged on each exhaust pipeline, wherein, the solenoid valve on the exhaust pipeline is configured to: when the slider slides upward and passes through an exhaust pipeline, the solenoid valve on this exhaust pipeline opens and communicates with the first air chamber, so that when the air intake volume of the first air inlet pipeline is balanced with the exhaust volume of the exhaust pipeline, the slider is maintained at the current height.

2. The air flow detection device according to claim 1, characterized in that, the diameters of the plurality of exhaust pipelines increase sequentially from bottom to top.

3. The air flow detection device according to claim 1, characterized in that, a flow distribution plate perpendicular to the air flow direction is arranged in the first air chamber. The flow distribution plate is provided with densely distributed flow distribution holes for buffering the gas passing through the flow distribution plate, and the first air inlet pipeline is connected below the flow distribution plate.

4. The air flow detection device according to claim 3, characterized in that, the sensor is embedded in the flow distribution plate.

5. The air flow detection device according to claim 3, characterized in that, annular first limiting platforms and second limiting platforms are respectively arranged at both ends of the movement track of the slider inside the fixed pipe. Among them, the second limiting platform is arranged above the first limiting platform, and the flow distribution plate is arranged below the first limiting platform.

6. The air flow detection device according to claim 5, characterized in that, the first limiting platform and the flow distribution plate are arranged at intervals, and the second limiting platform and the top of the fixed pipe are arranged at intervals.

7. The air flow detection device according to claim 1, characterized in that, the roughness of the inner wall of the fixed pipe is less than the roughness of the surface of the slider.

8. The air flow detection device according to claim 7, characterized in that, the fixed pipe and the base are integrally formed by welding.

9. The air flow detection device according to claim 1, characterized in that, a second air inlet pipeline is connected to the top of the fixed pipe, and a pressure relief pipeline is shunted to the first air inlet pipeline and the second air inlet pipeline respectively.

10. The air flow detection device according to claim 9, characterized in that, solenoid valves are respectively arranged on the first air inlet pipeline, the second air inlet pipeline and the pressure relief pipeline.

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