A high-precision wind pressure sensor

Abstract

The present invention discloses a high-precision wind pressure sensor, which relates to the technical field of wind pressure sensors. The sensor comprises a shell, a conversion circuit board is fixed inside the shell, a sensitive element is mounted on the conversion circuit board, a pressure interface aligned with the sensitive element is fixedly connected to the conversion circuit board, and a piston assembly is also included. The piston assembly includes a piston plate slidably connected to the inside of the pressure interface, an upper spring is provided between the piston plate and the inner wall of the pressure interface; a flushing mechanism, the flushing mechanism includes a push plate slidably connected to the inside of the pressure interface, a lower spring is provided between the push plate and the inner wall of the pressure interface, when the wind pressure sensor is finished being used, external gas is introduced into the inside of the pressure interface by moving the push plate upward, and the surface of the sensitive element is flushed by the airflow, thereby effectively reducing the concentration of harmful gas molecules on the surface of the sensitive element and slowing down the corrosion rate of the sensitive element, thereby ensuring the accuracy of the sensitive element and extending its service life.

Description

Technical Field

[0001] The present invention relates to the technical field of wind pressure sensors, and in particular to a high-precision wind pressure sensor. Background Art

[0002] A wind pressure sensor is a high-precision sensor device specifically used to measure gas pressure. It can sense changes in air pressure in the environment and accurately convert this pressure signal into an electrical signal that can be recognized and processed by electronic equipment, such as voltage, current or frequency signals, thereby achieving measurement, monitoring and control of wind pressure.

[0003] The wind pressure sensor is mainly composed of key parts such as sensitive elements, shells and pressure interfaces. When in use, the pressure interface is connected to the air duct so that the pressure in the duct can act on the sensitive element through the pressure interface. By detecting and analyzing the changes caused by the pressure on the sensitive element, the wind pressure in the air duct is measured.

[0004] In the industrial production process, after the wind pressure sensor is used to measure the pressure of the target gas, target gas molecules often remain on the surface of the sensitive element. When the target gas is acidic, alkaline or oxidizing, even if the surface of the sensitive element is coated with an anti-corrosion coating, it will still suffer varying degrees of corrosion. Under the erosion of such gases, the accuracy of the sensitive element is the first to be affected, causing the measurement error of the wind pressure sensor to increase significantly. Not only that, corrosion will also shorten the service life of the sensor and increase equipment maintenance costs. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that after using a wind pressure sensor to measure gas pressure, gas molecules will remain on the surface of its internal sensitive element. If these gases are acidic, alkaline or oxidizing, they will continue to corrode the sensitive element when the sensor is not in use, causing the measurement error of the wind pressure sensor to increase significantly and shortening the service life of the sensor. A high-precision wind pressure sensor is proposed to solve the problem that after using a wind pressure sensor to measure gas pressure, gas molecules will remain on the surface of its internal sensitive element. If these gases are acidic, alkaline or oxidizing, they will continue to corrode the sensitive element when the sensor is not in use, causing the measurement error of the wind pressure sensor to increase significantly and shortening the service life of the sensor.

[0006] To achieve the above objectives, the present invention adopts the following technology: a high-precision wind pressure sensor comprising a housing, a conversion circuit board fixed inside the housing, a sensitive element mounted on the conversion circuit board, a pressure interface fixedly connected to the conversion circuit board and aligned with the sensitive element, and further comprising:

[0007] A piston assembly, the piston assembly comprising a piston plate slidably connected to the interior of the pressure interface, an upper spring being provided between the piston plate and the inner wall of the pressure interface;

[0008] A flushing mechanism, the flushing mechanism comprising a push plate slidably connected to the interior of the pressure interface, a lower spring being provided between the push plate and the inner wall of the pressure interface;

[0009] A lifting assembly disposed between the push plate and the piston plate;

[0010] When the push plate is lifted, air flow is introduced through negative pressure to flush the surface of the sensitive element, and when the push plate is pressed down, the used gas is discharged.

[0011] As a further description of a high-precision wind pressure sensor of the above technology: a connecting piece connected to the inside of the pressure interface is fixed to the outside of the pressure interface, two interfaces are arranged on the connecting piece and one-way diaphragms are provided in both interfaces.

[0012] As a further description of a high-precision wind pressure sensor of the above technology: a closing unit is installed inside the push plate, and the closing unit includes a sealing plate slidably connected to the inside of the push plate, a return spring is provided between the sealing plate and the push plate, and a bevel block is fixed at one end of the sealing plate.

[0013] As a further description of a high-precision wind pressure sensor of the above technology: an airflow control unit is arranged inside the pressure interface, and the airflow control unit includes a ring part and a connecting ring that are rotatably connected to the inside of the pressure interface and fixed to each other, and a protrusion is fixedly connected to the outer side of the push plate.

[0014] As a further description of a high-precision wind pressure sensor of the above technology: an inclined flow guide pipe is fixedly connected to the interior of the connecting ring, and a wavy sliding groove is opened on the inner wall of the annular member.

[0015] As a further description of a high-precision wind pressure sensor of the above technology: a plurality of groups of symmetrical air flow channels are provided inside the piston plate, and the bottom ends of each group of air flow channels are arranged relative to each other.

[0016] As a further description of a high-precision wind pressure sensor of the above technology: the bottom of the piston plate is fixedly connected to a guide tube, and the bottom of the guide tube is provided with air flow holes arranged in a circumferential array and set obliquely.

[0017] As a further description of a high-precision wind pressure sensor of the above technology: the pulling assembly includes a pull rod fixed to the bottom of the guide tube and slidingly connected to the pressure interface, the bottom end of the pull rod is fixedly connected to a pressure block, the inside of the pressure block is elastically installed with a bayonet, the top of the push plate is fixedly connected to the connecting tube, and the inside of the pressure interface is fixedly installed with an electromagnet.

[0018] In summary, due to the use of the above-mentioned technology to provide a high-precision wind pressure sensor, the beneficial effects of the present invention are:

[0019] When the wind pressure sensor is no longer in use, the push plate is moved upward to introduce external gas into the pressure interface, and the surface of the sensitive element is flushed by the airflow, which effectively reduces the concentration of harmful gas molecules on the surface of the sensitive element and slows down the corrosion rate of the sensitive element, thereby ensuring the accuracy of the sensitive element and extending its service life. Not only that, the introduced air can be discharged when the push plate is reset to seal the sensitive element. This sealing effect further prevents external corrosive gas from contacting the sensitive element when it is not working, providing an additional protective barrier for the sensitive element, ensuring the performance and life of the sensitive element, and improving the reliability and stability of the entire wind pressure sensor.

[0020] Through the cooperation of the bump and the ring, the airflow can swing left and right in the process of flushing harmful gas molecules on the surface of the sensitive element. This design not only expands the coverage area of ​​the flushing and improves the uniformity of the flushing, which helps to enhance the flushing effect, but also prevents the airflow from always acting on the same position of the sensitive element, avoiding fatigue caused by continuous pressure on a local position on the sensitive element, reducing performance drift, making the performance of the sensitive element more stable, and ensuring measurement accuracy.

[0021] During operation, sensitive components will generate internal stress due to long-term pressure. When this application uses negative pressure to introduce airflow, the negative pressure environment reduces the external force on the sensitive components, which helps to release their internal stress and avoid material fatigue or deformation due to stress accumulation, thereby extending the service life of the sensitive components and improving their use effect.

[0022] The present application achieves a buffering effect through the elastic force of the upper spring, the counteraction after the air flow is dispersed, and the extension of the air flow path, thereby avoiding the sudden sharp rise in pressure inside the air duct due to sudden valve opening and closing, equipment start-up and shutdown, etc., which may cause damage or even destruction of sensitive components under the action of impact force, thereby extending the service life of the wind pressure sensor. The flushing mechanism is driven by the elastic force of the upper spring and can be automatically triggered when the sensor is closed, which is convenient for use. Finally, it is worth mentioning that after the measurement is completed, when the flushing mechanism introduces air flow through negative pressure, the resistance encountered by the flushing mechanism can also react to the piston assembly through the lifting assembly, slowing down the reset speed of the piston assembly, thereby having a buffering effect on the reset of the piston assembly, reducing the vibration of the wind pressure sensor, and further extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shows an overall schematic diagram provided according to an embodiment of the present invention;

[0024] Figure 2 Shows an overall exploded view provided according to an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of a varistor provided according to an embodiment of the present invention is shown;

[0026] Figure 4 shows a cross-sectional view of a pressure interface provided according to an embodiment of the present invention;

[0027] Figure 5 An exploded view of a piston assembly according to an embodiment of the present invention is shown;

[0028] Figure 6 Shows a cross-sectional view of a push plate provided in an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of an airflow control unit provided according to an embodiment of the present invention is shown;

[0030] Figure 8 The embodiment of the present invention provides Figure 7 Enlarged view of point A in the middle.

[0031] Legend:

[0032] 10. Housing; 11. Conversion circuit board; 12. Sensitive element; 13. Pressure interface;

[0033] 20. Piston assembly; 21. Piston plate; 22. Guide tube; 23. Upper spring;

[0034] 30. Lifting assembly; 31. Pull rod; 32. Press block; 33. Bayonet pin; 34. Connecting cylinder; 35. Electromagnet;

[0035] 40. Flushing mechanism; 41. Push plate; 42. Lower spring; 43. Connecting piece; 44. One-way diaphragm; 45. Closing unit; 451. Inclined block; 452. Return spring; 453. Sealing plate; 46. Airflow control unit; 461. Protrusion; 462. Ring piece; 463. Connecting ring; 464. Flow guide tube. DETAILED DESCRIPTION

[0036] The following will provide a clear and complete description of the technology in the embodiments of the present invention, a high-precision wind pressure sensor, in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] like Figures 1-8As shown, the present invention provides a high-precision wind pressure sensor: it includes a housing 10, a conversion circuit board 11 is fixed inside the housing 10, a sensitive element 12 is installed on the conversion circuit board 11, the sensitive element 12 includes four piezoresistors, the sensitive element 12 converts pressure into resistance change when subjected to pressure through the piezoresistive effect, the conversion circuit board 11 converts the resistance change of the sensitive element 12 into an electrical signal to achieve wind pressure measurement, and a pressure interface 13 aligned with the sensitive element 12 is fixedly connected to the conversion circuit board 11. When the wind pressure sensor is in use, the pressure interface 13 is connected to the air duct to be measured, so that the gas pressure in the air duct can act on the sensitive element 12 through the pressure interface 13, and then the wind pressure in the air duct is measured.

[0038] In order to prevent the internal pressure of the air duct from rising sharply due to sudden valve opening and closing, equipment start-up and shutdown, etc., which may cause damage or even destruction of the sensitive element 12 under the action of the impact force, a piston assembly 20 is also included. The piston assembly 20 includes a piston plate 21 slidably connected to the inside of the pressure interface 13. An upper spring 23 is provided between the piston plate 21 and the inner wall of the pressure interface 13. When the gas in the air duct enters the inside of the pressure interface 13, the air flow will press the piston plate 21 downward, causing the upper spring 23 to be compressed. The friction between the piston plate 21 and the inner wall of the pressure interface 13 and the elastic force of the upper spring 23 buffer the impact force of the air flow, thereby preventing the air flow from directly impacting the sensitive element 12, thereby protecting the sensitive element 12.

[0039] Reference Figure 5 and Figure 7 In order to further enhance the cushioning effect of the piston assembly 20, the piston plate 21 is provided with several groups of symmetrical airflow channels. The bottom ends of each group of airflow channels are arranged relative to each other. When the piston plate 21 is subjected to the thrust of the airflow and compresses the upper spring 23, part of the airflow will pass through the airflow channel. After the airflow is ejected from the two airflow channels in each group, it will collide with each other, offsetting part of the airflow power and achieving the effect of reducing the impact force of the airflow.

[0040] The bottom of the piston plate 21 is fixedly connected to a guide tube 22, and the bottom of the guide tube 22 is provided with air flow holes arranged in a circular array and set obliquely. The air flow is then ejected from the air flow holes of the guide tube 22. Under the guidance of several air flow holes, multiple air flows flow downward in a spiral form. This design can extend the flow path of the air flow, thereby further weakening the kinetic energy of the air flow and achieving a buffering effect. It can also make the air flow evenly distributed in the pressure interface 13, balance the pressure at various locations on the sensitive element 12, and thereby improve the measurement accuracy of the sensitive element 12.

[0041] During operation, the sensitive element 12 will generate internal stress due to long-term pressure. When the push plate 41 moves upward to form a negative pressure inside the pressure interface 13, the negative pressure environment reduces the external force on the sensitive element 12, which helps to release its internal stress and avoid material fatigue or deformation due to stress accumulation, thereby extending the service life of the sensitive element 12.

[0042] Reference Figure 4 and Figure 7 , because when the wind pressure sensor measures the internal pressure of the air duct, the gas in the air duct will contact the sensitive element 12 through the pressure interface 13. Therefore, if there is corrosive gas in the air duct, the gas will be retained in the pressure interface 13 after the measurement, causing the sensitive element 12 to continue to be corroded when not in use, reducing the service life and measurement accuracy of the sensitive element 12. In order to solve this problem, a flushing mechanism 40 is also provided. The flushing mechanism 40 includes a push plate 41 slidably connected to the inside of the pressure interface 13, and a lower spring 42 is provided between the push plate 41 and the inner wall of the pressure interface 13. A connecting piece 43 connected to the inside of the pressure interface 13 is fixed to the outside of the pressure interface 13. Two interfaces are arranged on the connecting piece 43 and a one-way diaphragm 44 is provided in both interfaces. A filter is provided inside the connecting piece 43 to prevent impurities from entering the pressure interface 13. One of the interfaces of the connecting piece 43 is connected to a container filled with flushing gas or air, and the other interface is connected to an exhaust gas collection container.

[0043] When the push plate 41 is lifted, negative pressure is formed inside the pressure interface 13, and the one-way diaphragm 44 in one of the interfaces of the connecting piece 43 is opened under the action of air pressure. The flushing gas is sucked from the interface under the action of negative pressure until it enters the interior of the pressure interface 13 to flush the surface of the sensitive element 12, thereby preventing the sensitive element 12 from being continuously eroded by corrosive gas after the sensor is no longer used. When the push plate 41 is pressed down, the air pressure inside the pressure interface 13 increases. At this time, the flushed gas is squeezed into the connecting piece 43 and the one-way diaphragm 44 in the other interface is opened, so that the flushed gas enters the exhaust gas collection container and waits for subsequent processing.

[0044] Reference Figure 5 and Figure 7 In order to automatically flush the sensitive element 12 after the wind pressure sensor is turned off and simplify the operating steps, a lifting assembly 30 is provided between the push plate 41 and the piston plate 21. The lifting assembly 30 includes a pull rod 31 fixed to the bottom of the guide tube 22 and slidably connected to the pressure interface 13. An iron ring is fixed on the pull rod 31. The bottom end of the pull rod 31 is fixedly connected to a pressure block 32. Four bayonet pins 33 are elastically installed inside the pressure block 32. The top of the push plate 41 is fixedly connected to a connecting tube 34. An electromagnet 35 is fixedly installed inside the pressure interface 13. The electromagnet 35 is wrapped with shielding material to prevent the sensor from being subjected to electromagnetic interference. When the sensor is turned off, the electromagnet 35 is turned off at the same time.

[0045] The distance between the iron ring and the electromagnet 35 is the same as the distance between the bayonet 33 and the push plate 41. After the piston plate 21 is pressed down by the gas impact force and the upper spring 23 is compressed, the pull rod 31 moves downward with the piston plate 21. The iron ring is attracted after contacting the electromagnet 35, so that the upper spring 23 remains in a compressed state. The radius of the inner wall of the top of the connecting cylinder 34 is the same as the radius of the pressure block 32, and the radius of the inner wall of the bottom of the connecting cylinder 34 is the same as the distance from the outer side of the bayonet 33 to the axis of the pull rod 31. During the process of the pressure block 32 being driven down by the pull rod 31, the pressure When the block 32 enters the connecting cylinder 34, the bayonet 33 is compressed into the inside of the pressure block 32. When the pressure block 32 drops to the bottom of the connecting cylinder 34, the bayonet 33 pops out, realizing the bayonet 33 and the connecting cylinder 34 being locked. When the sensor is turned off, the electromagnet 35 is turned off and loses the attraction to the iron ring of the pull rod 31. At this time, the elastic force of the upper spring 23 drives the piston plate 21, the pull rod 31, the pressure block 32 and the bayonet 33 to move upward, and the connecting cylinder 34 and the push plate 41 are lifted by the bayonet 33. At this time, the lower spring 42 is gradually compressed.

[0046] As the push plate 41 moves upward, the lower spring 42 is gradually compressed, and the downward force on the push plate 41 and the connecting cylinder 34 gradually increases, and the extrusion force on the pin 33 from the connecting cylinder 34 gradually increases. After the connecting cylinder 34 compresses the pin 33 into the pressure block 32, the connecting cylinder 34 and the push plate 41 move downward under the elastic force of the lower spring 42. The internal air pressure of the pressure interface 13 is changed by the movement of the push plate 41, and the airflow is controlled to flush the sensitive element 12. This design can compress the upper spring 23 with the help of the impact force of the airflow in the air duct, and use the elastic force of the upper spring 23 to automatically trigger the flushing mechanism 40 to flush the sensitive element 12 when the sensor is closed, thereby ensuring the performance and life of the sensitive element 12.

[0047] Reference Figure 6 In order to prevent the push plate 41 from interfering with the wind pressure measurement, a through hole is opened on the push plate 41, and a closing unit 45 is installed inside the push plate 41. The closing unit 45 includes a sealing plate 453 that is slidably connected to the inside of the push plate 41. When the push plate 41 moves up and down, the closing unit 45 closes the through hole of the push plate 41, so that the push plate 41 can control the airflow by moving up and down to achieve a flushing effect. A return spring 452 is provided between the sealing plate 453 and the push plate 41, and an inclined block 451 is fixed to one end of the sealing plate 453. When the pressure block 32 drops to the lowest position, the wind pressure sensor needs to measure the pressure of the air duct. The pin 33 pushes the inclined block 451 to drive the sealing plate 453 to be staggered with the through hole of the push plate 41, so that the through hole of the push plate 41 is in an open state. At this time, the sensitive element 12 is connected to the air duct through the pressure interface 13, so that wind pressure measurement can be achieved.

[0048] When the wind pressure sensor is not in use, the sealing plate 453 seals the through hole of the push plate 41 , preventing external gas from contacting the sensitive element 12 in a non-working state, thereby ensuring the performance and life of the sensitive element 12 .

[0049] Reference Figure 7 and Figure 8 To further enhance the effect of flushing the sensitive element 12 through airflow, an airflow control unit 46 is provided inside the pressure interface 13. The airflow control unit 46 includes a ring member 462 and a connecting ring 463 that are rotatably connected to the interior of the pressure interface 13 and fixed to each other. A bump 461 is fixedly connected to the outer side of the push plate 41, and an inclined flow guide pipe 464 is fixedly connected to the interior of the connecting ring 463. Under the guidance of the flow guide pipe 464, the airflow enters the interior of the pressure interface 13 in a downwardly inclined state, which can enhance the ability of the airflow to flush harmful gases from the surface of the sensitive element 12. The connecting ring 463 and the flow guide pipe 464 are in communication with the connecting member 43 and the pressure interface 13.

[0050] A wavy groove is provided on the inner wall of the annular member 462, and the protrusion 461 is embedded in the groove. When the push plate 41 moves upward, the protrusion 461 moves in the groove, pushing the annular member 462 to swing back and forth, driving the connecting ring 463 and the guide pipe 464 to swing back and forth, so that the airflow blown out of the guide pipe 464 can swing left and right, expanding the coverage area of ​​the flushing and improving the uniformity of the flushing, while preventing the airflow from always acting on the same position of the sensitive element 12, causing the local position on the sensitive element 12 to be continuously pressurized and fatigued.

[0051] Working principle: When the air duct is used for air transportation, the air in the air duct enters the pressure interface 13, and the thrust of the air flow drives the piston plate 21 to move toward the inside of the pressure interface 13. The upper spring 23 is compressed, and the piston plate 21 drives the guide cylinder 22, the pull rod 31, the pressure block 32 and the bayonet 33 to move toward the push plate 41. When the pressure block 32 enters the connecting cylinder 34, the bayonet 33 is compressed into the pressure block 32. When the pressure block 32 drops to the bottom of the connecting cylinder 34, the bayonet 33 pops out, realizing the bayonet 33 and the connecting cylinder 34. The pressure block 32 continues to move to push the inclined block 451 to drive the sealing plate 453 to move, so that the through hole of the push plate 41 is opened. At this time, the electromagnet 35 attracts and fixes the iron ring of the pull rod 31 through magnetic attraction.

[0052] The air then passes through the air flow channel on the piston plate 21, the air flow holes of the guide cylinder 22, and the through hole of the push plate 41, and contacts the sensitive element 12. The air pressure acts on the sensitive element 12, causing the wind pressure sensor to measure the pressure in the air duct.

[0053] When the wind pressure sensor is closed, the electromagnet 35 no longer attracts the iron ring of the pull rod 31, and the extension elastic force of the upper spring 23 drives the piston plate 21, the guide tube 22, the pull rod 31, the pressure block 32 and the bayonet 33 to move and reset in the direction away from the sensitive element 12. The inclined block 451 loses the squeezing of the pressure block 32, and the sealing plate 453 is reset under the elastic force of the reset spring 452. Then the pressure block 32 and the bayonet 33 continue to move to drive the connecting tube 34 and the push plate 41 to move in the direction away from the sensitive element 12. A negative pressure is formed in the space inside the pressure interface 13 that is connected to the sensitive element 12. The one-way diaphragm 44 in one of the interfaces of the connecting piece 43 is opened under the action of air pressure, and the outside air or flushing gas is sucked into the interface under the action of negative pressure. After the gas passes through the connecting piece 43, the connecting ring 463 and the guide tube 464 in turn, the surface of the sensitive element 12 is flushed to prevent the sensitive element 12 from being continuously corroded by corrosive gas after the sensor is no longer used.

[0054] When the push plate 41 moves away from the sensitive element 12, the protrusion 461 moves in the slide groove, pushing the annular member 462 to swing back and forth, driving the connecting ring 463 and the guide pipe 464 to swing back and forth, so that the air flow blown out of the guide pipe 464 can swing left and right, thereby improving the flushing uniformity.

[0055] As the push plate 41 moves away from the sensitive element 12, the lower spring 42 is gradually compressed, and the force exerted on the push plate 41 and the connecting cylinder 34 toward the sensitive element 12 gradually increases. The extrusion force exerted on the bayonet 33 by the connecting cylinder 34 gradually increases. After the connecting cylinder 34 compresses the bayonet 33 into the inside of the pressure block 32, the connecting cylinder 34 and the push plate 41 move toward the direction of the sensitive element 12 under the elastic force of the lower spring 42. At this time, the air pressure inside the pressure interface 13 increases, and the flushed gas is squeezed into the connecting piece 43. The one-way diaphragm 44 in another interface of the connecting piece 43 opens, and the flushed gas enters the exhaust gas collection container through the interface, waiting for subsequent processing.

[0056] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited to this. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes to a high-precision wind pressure sensor and its inventive concept based on the technology of the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A high-precision wind pressure sensor, comprising a housing (10), a conversion circuit board (11) fixed inside the housing (10), a sensitive element (12) mounted on the conversion circuit board (11), and a pressure interface (13) aligned with the sensitive element (12) fixedly connected to the conversion circuit board (11), characterized in that: Also includes: A piston assembly (20), the piston assembly (20) comprising a piston plate (21) slidably connected to the interior of the pressure interface (13), an upper spring (23) being provided between the piston plate (21) and the inner wall of the pressure interface (13), and a guide tube (22) being fixedly connected to the bottom of the piston plate (21); A flushing mechanism (40), the flushing mechanism (40) comprising a push plate (41) slidably connected to the interior of the pressure interface (13), a lower spring (42) being provided between the push plate (41) and the inner wall of the pressure interface (13); A lifting assembly (30) is provided between the push plate (41) and the piston plate (21), the lifting assembly (30) comprising a pull rod (31) fixed to the bottom of the guide tube (22) and slidably connected to the pressure interface (13), the bottom end of the pull rod (31) is fixedly connected to a pressure block (32), a bayonet (33) is elastically installed inside the pressure block (32), the top of the push plate (41) is fixedly connected to a connecting tube (34), and an electromagnet (35) is fixedly installed inside the pressure interface (13); When the push plate (41) is lifted, air flow is introduced through negative pressure to flush the surface of the sensitive element (12), and when the push plate (41) is pressed down, the used gas is discharged.

2. A high-precision wind pressure sensor according to claim 1, characterized in that: A connecting piece (43) communicating with the interior of the pressure interface (13) is fixed to the outside of the pressure interface (13), and two interfaces are arranged on the connecting piece (43), and one-way diaphragms (44) are provided in both interfaces.

3. A high-precision wind pressure sensor according to claim 1, characterized in that: A closing unit (45) is installed inside the push plate (41), and the closing unit (45) includes a sealing plate (453) slidably connected to the inside of the push plate (41), a return spring (452) is provided between the sealing plate (453) and the push plate (41), and an inclined block (451) is fixed to one end of the sealing plate (453).

4. A high-precision wind pressure sensor according to claim 1, characterized in that: An airflow control unit (46) is provided inside the pressure interface (13), and the airflow control unit (46) comprises an annular member (462) and a connecting ring (463) which are rotatably connected to the inside of the pressure interface (13) and fixed to each other, and a protrusion (461) is fixedly connected to the outer side of the push plate (41).

5. A high-precision wind pressure sensor according to claim 4, characterized in that: An inclined flow guide pipe (464) is fixedly connected to the interior of the communication ring (463), and a wavy sliding groove is provided on the inner wall of the annular member (462).

6. The high-precision wind pressure sensor according to claim 1, characterized in that: Several groups of symmetrical air flow channels are provided inside the piston plate (21), and the bottom ends of each group of air flow channels are arranged relative to each other.

7. The high-precision wind pressure sensor according to claim 1, characterized in that: The bottom of the guide tube (22) is provided with air flow holes arranged in a circumferential array and arranged obliquely.

Images