A redundant design airflow sensor with fault self-healing

Abstract

The application relates to the technical field of sensors, in particular to a redundant design airflow sensor with a fault self-recovery function, which comprises a shell, an upper shell, a force storage assembly, a partition plate, a sliding plate, an adjusting assembly, a heating rod and an upper cover, the upper shell is connected to the upper side of the shell, the force storage assembly is connected to the outer wall of the shell, the partition plate is connected to the middle part of the inner cavity of the shell, the sliding plate is connected to the partition plate, two adjusting assemblies are respectively connected to the left and right sides of the inner cavity of the shell, two heating rods are respectively connected to the upper sides of the two adjusting assemblies, the upper side of the partition plate is connected with the upper cover, the inner wall of the upper shell is provided with a sliding groove, and the sliding groove is arranged in an inclined manner; the two heating rods are alternately extended through the rotation of the upper shell, the stability of the airflow sensor is guaranteed, the outer wall of the descending heating rod is in contact with the upper cover, impurities and attachments are removed, and the service life of the airflow sensor is prolonged.

Description

Technical Field

[0001] This invention relates to the field of sensor technology, specifically to a redundant airflow sensor with fault self-healing function. Background Technology

[0002] Airflow sensors are a type of smart sensor, mainly used to measure the velocity or flow rate of air or other gases. They can convert gas flow information into electrical signals that can be read and processed. Thermal airflow sensors are among the most common devices because they have the advantages of fast response and high accuracy, and are often used to monitor the airflow velocity in pipelines.

[0003] The working principle of a thermal airflow sensor is that a heated metal wire is placed in the sensor. When airflow passes through it, the airflow carries away the heat from the metal wire, cooling it down. The faster the airflow speed, the more heat is carried away, and the more significant the temperature drop of the metal wire. By measuring the current required to maintain its constant temperature, the mass flow rate of the air can be accurately calculated. However, the measurement of a thermal airflow sensor requires the airflow to pass through the metal wire. As the airflow passes through the metal wire, impurities in the airflow come into contact with and adhere to the metal wire. As the measurement time progresses, the impurities on the surface of the metal wire gradually increase, leading to a decrease in the heat dissipation capacity of the metal wire, which in turn causes inaccurate detection by the thermal airflow sensor.

[0004] To address the aforementioned issues, existing technologies have proposed several solutions, such as redundant design. This involves using spare metal wires to replace damaged wires, thereby extending the operating time of thermal airflow sensors. However, in factory applications, production activities can lead to a higher concentration of impurities in the air. Consequently, these impurities adhere rapidly to the surface of the metal wires during exhaust airflow detection, severely impacting the operating time of the thermal airflow sensor.

[0005] To address this, a redundant airflow sensor with fault self-healing capability is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a redundant airflow sensor with a fault self-healing function. This solves the problem that when there are many impurities in the air, the impurities quickly adhere to the metal wire, which leads to a decrease in the heat dissipation effect of the metal wire and affects the detection accuracy. By setting two heating rods, the two heating rods extend alternately when the upper shell rotates, thereby ensuring the reliability of the airflow sensor. At the same time, the descent of the heating rods allows the outer wall of the heating rods to contact the upper cover, which can effectively remove the impurities and extend the service life of the airflow sensor.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A redundant airflow sensor with self-healing capability includes a housing, an upper housing, a power storage component, a partition, a sliding plate, an adjustment component, heating rods, and a top cover. The upper housing is connected to the upper side of the housing, the power storage component is connected to the outer wall of the housing and is connected to the upper housing, the partition is connected to the middle of the inner cavity of the housing, the sliding plate is connected in the partition, two adjustment components are respectively connected to the left and right sides of the inner cavity of the housing, two heating rods are respectively connected to the upper sides of the two adjustment components, and the top cover is connected to the upper side of the partition. The inner wall of the upper housing has a sliding groove, which is arranged at an angle. The two adjustment components are connected to the two sides of the sliding groove. Initially, the sliding plate locks the housing and the upper housing. When the weight of the heating rod reaches a specified level, the adjustment component causes the sliding plate to move and release the lock between the housing and the upper housing. When the upper housing rotates the sliding groove under the action of the power storage component, the two heating rods rise and fall alternately along the sliding groove.

[0009] With the above solution, two heating rods are set up and used alternately, which ensures that the airflow sensor is kept in the best working condition and improves the detection accuracy of the airflow sensor. At the same time, the descent of the heating rods allows the outer wall of the heating rods to contact the top cover, which can effectively remove impurities.

[0010] Preferably, the inner wall of the upper shell is provided with a longitudinally arranged limiting groove, and the inner wall of the outer shell is provided with a longitudinally arranged positioning groove. The side walls of the limiting groove and the positioning groove are both provided with chamfers. When the projection of the limiting groove covers the projection of the positioning groove from a top view, the sliding plate is engaged in the limiting groove and the positioning groove.

[0011] With the above scheme, the side walls of the limiting groove and the positioning groove are chamfered, which makes it easier to guide the slide plate into the limiting groove and the positioning groove, thereby locking the angle between the outer shell and the upper shell, and making it easier to apply force to the power storage component through airflow.

[0012] Preferably, the power storage assembly includes a housing, a torsion spring, a ratchet, a pawl, and fins. The housing is connected to the upper side of the outer wall of the outer shell. The torsion spring is disposed in the inner cavity of the housing, and its two ends are respectively connected to the housing and the upper shell. The ratchet is connected to the outer wall of the outer shell. The pawl is connected to the housing. The fin array is connected to the outer wall of the housing.

[0013] With the above scheme, when the airflow passes through the fins, it will drive the shell to rotate, thereby achieving the purpose of applying force to the torsion spring through the airflow, and thus driving the upper shell and adjusting the angle of the upper shell.

[0014] Preferably, the adjusting assembly includes a tension spring, a sleeve, a slide rod, a pin, and the tension spring. The tension spring is connected to the top of the inner cavity of the outer shell, the sleeve is connected to the top of the tension spring, the slide rod passes through the sleeve and one end of the slide rod extends into the slide groove, the pin is connected to the slide rod and the pin has different lengths on both sides of the slide rod. The short end of the pin is connected to the tension spring, and the long end of the pin is attached to the lower end of the heating rod.

[0015] By adjusting the length of the pin on the slide rod, the lever arm length of the pin is changed, so that the long lever arm is in contact with the heating rod and the short lever arm is connected to the tension spring. Thus, when impurities adhere to the surface of the heating rod, even a small amount of impurities can drive the slide rod to rotate through the pin.

[0016] Preferably, the partition has a rectangular groove in the middle, and the other end of the slide rod extends into the rectangular groove. The slide plate includes a retaining plate, a double-layer metal spring, and a baffle. The retaining plate and the baffle are slidably connected in the partition. The double-layer metal spring is connected between the retaining plate and the baffle. The double-layer metal spring is made of two different metal materials.

[0017] With the above solution, the double-layer metal spring is made of two different metal materials. When the double-layer metal spring is heated, the two materials will undergo thermal expansion of different degrees. By limiting the baffle, the card plate can be moved closer to the baffle, thereby releasing the lock between the outer shell and the upper shell and realizing the switching of the faulty heating rod.

[0018] Preferably, the gap between the two adjacent sides of the baffles gradually decreases from bottom to top, and the slide rod extends to the rectangular groove with slots on both sides. Thus, the gap between the adjacent sides of the baffles gradually decreases from bottom to top, thereby changing the resistance when the slide rod moves upward, and achieving the purpose of adjusting the rotation speed of the upper shell.

[0019] The side of the card plate away from the baffle is arc-shaped, and a push spring connects the baffle and the partition. Thus, the arc-shaped design of the side of the card plate away from the baffle can effectively reduce the friction between the upper shell and the card plate when the upper shell rotates.

[0020] Preferably, the slide is divided into an ascending section and a descending section, both of which are formed on the inner wall of the upper shell. The bottom wall of the descending section is connected with an array of protrusions, and the protrusions and the bottom wall of the descending section are transitioned by an arc angle.

[0021] The above scheme ensures that when the slide bar moves in the descending section of the slide groove, its main trend is downward, but during the descent, it intermittently rises slightly, which facilitates the airflow to carry away the attached material and prevents the accumulation of the attached material.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This invention solves the problem that when there are many impurities in the air, the impurities quickly adhere to the metal wire, which reduces the heat dissipation effect of the metal wire and affects the detection accuracy. It sets up two heating rods. When the adjustment component senses a change in the weight of the heating rod reaching a specified level, the power storage component drives the upper shell to rotate, causing the working heating rod to descend along the lowering section and the spare heating rod to rise. This ensures that the airflow sensor remains in optimal working condition. When the heating rod descends, its outer wall contacts the upper cover, effectively removing impurities. Simultaneously, as the heating rod moves downward, the sliding rod contacts the protrusion, which causes the working heating rod to slightly move upward while maintaining a large downward trend. This allows the working heating rod to slightly move upward after some of the attached impurities are scraped off by the upper cover, facilitating the airflow to carry away impurities from the surface of the upper cover and preventing impurity accumulation.

[0024] 2. By setting an adjustment component, when the weight of the heating rod increases, the angle at which the slide rod extends into the rectangular slot changes, causing the adjacent sides of the two baffles to lose support. The torsion spring drives the upper shell to rotate. When the slide rod moves in the rising section, the other end of the slide rod will contact the two baffles. Since the gap between the adjacent sides of the two baffles gradually decreases from bottom to top, the resistance exerted by the baffles on the slide rod gradually increases as the slide rod moves upward and contacts the baffles. This achieves the following: on the one hand, the slide rod moves quickly in the initial stage of upward movement, reducing the pause gap of the airflow sensor monitoring; on the other hand, the speed is slower in the later stage of upward movement, reducing the impact force on the heating rod during pauses. Furthermore, the resistance of the slide rod moving upward reduces the rotation speed of the upper shell, thus facilitating the engagement of the clamping plate with the limiting groove and positioning groove.

[0025] 3. By setting up a sliding plate, when the sliding rod pushes the sliding plate into the limiting groove and positioning groove, the double-layer metal spring will deform to store energy. Then, when the limiting groove and positioning groove coincide, the double-layer metal spring will release energy instantly, pushing the sliding plate into the limiting groove and positioning groove, ensuring the stability of the sliding plate locking the upper shell and outer shell. At the same time, by opening the spare heating rod in the inner cavity of the upper shell, the double-layer metal spring will undergo thermal expansion, which will cause the double-layer metal spring to bend. The distance between the two ends of the bent double-layer metal spring will shorten, thereby causing the locking plate to separate from the limiting groove and positioning groove, realizing the purpose of replacing the heating rod in case of failure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0028] Figure 3 This is a schematic diagram of the slide groove portion of the present invention;

[0029] Figure 4 This is a schematic diagram of the energy storage component of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the adjustment component of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the skateboard part of the present invention;

[0032] Figure 7 This is a schematic diagram of the rising and falling sections of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure of the protrusion portion of the present invention;

[0034] Figure 9 This is a schematic diagram showing the state when the heating rod is switched according to the present invention.

[0035] In the diagram: 1. Outer shell; 101. Positioning groove; 2. Upper shell; 201. Slide groove; 2011. Rising section; 2012. Falling section; 20121. Protrusion; 202. Limiting groove; 3. Power storage component; 301. Sleeve; 302. Torsion spring; 303. Ratchet; 304. Pawl; 305. Fin; 4. Partition; 401. Push spring; 402. Rectangular groove; 5. Slide plate; 501. Clamping plate; 502. Double-layer metal spring; 503. Baffle; 6. Adjustment component; 601. Tension spring; 602. Sleeve frame; 603. Slide rod; 6031. Bayonet; 604. Pin block; 605. Spring; 7. Heating rod; 8. Top cover. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, so as to provide a more detailed description of their working state and structural features. Obviously, the described embodiments are only some embodiments of the present invention and not complete embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of the present invention.

[0037] Please see Figures 1 to 9 This invention provides a redundant airflow sensor with fault self-healing function, the technical solution of which is as follows:

[0038] For details, please refer to Figures 1 to 9A redundant airflow sensor with self-healing capability is described. This system comprises multiple airflow sensors forming an intelligent sensing system for monitoring airflow velocity in pipelines. The airflow sensors are installed in the pipeline, with a movable block connected to the lower side of the pipeline. The movable block is connected to the pipeline via screws. Disassembly of the movable block allows for repair of any faulty airflow sensors. The airflow sensor includes a housing 1, an upper housing 2, a power storage component 3, a partition 4, a sliding plate 5, an adjustment component 6, a heating rod 7, and a top cover 8. The housing 1 is connected to the movable block on the pipeline via screws, and the upper housing 2 is connected to the upper side of the housing 1. 1. A rotating connection is made, with the energy storage component 3 connected to the outer wall of the outer shell 1 and connected to the upper shell 2. A partition 4 is connected to the middle of the inner cavity of the outer shell 1, with its bottom wall fixedly connected to the bottom wall of the inner cavity of the outer shell 1. The side walls of the partition 4 are not connected to the outer shell 1 or the upper shell 2. A sliding plate 5 is connected within the partition 4. Two adjusting components 6 are respectively connected to the left and right sides of the inner cavity of the outer shell 1, i.e., the two adjusting components 6 are respectively connected to the left and right sides of the partition 4. Two heating rods 7 are respectively connected to the upper side of the two adjusting components 6. An upper cover 8 is connected to the upper side of the partition 4, and the upper cover 8 is fixedly connected to the partition 4. Both heating rods 7 penetrate the upper... The cover 8 further restricts the heating rod 7, allowing it to move only up and down. A sliding groove 201 is provided on the inner wall of the upper shell 2, arranged at an angle. This angle causes the groove 201 to change height within the cavity of the upper shell 2. Two adjusting components 6 are connected to both sides of the groove 201; one adjusting component 6 is connected to the highest point of the groove 201, while the other is connected to the lowest point. The heating rod 7 on the adjusting component 6 connected to the highest point of the groove 201 is the working heating rod 7, and the other is a spare heating rod 7. Initially... The sliding plate 5 locks the angle between the outer shell 1 and the upper shell 2. When the weight of the heating rod 7 reaches a specified level, the adjusting component 6 causes the sliding plate 5 to move and release the lock between the outer shell 1 and the upper shell 2. When the upper shell 2 rotates the slide 201 under the action of the power storage component 3, the two heating rods 7 rise and fall alternately along the slide 201. That is, the adjusting component 6 connected to the highest point of the slide 201 moves down, causing the working heating rod 7 to move down. The adjusting component 6 connected to the lowest point of the slide 201 moves up, causing the spare heating rod 7 to move up. At this time, the spare heating rod 7 that moves up becomes the working heating rod 7, and the working heating rod 7 that moves down becomes the spare heating rod 7.

[0039] By setting two heating rods 7, one as the working heating rod 7 and the other as the backup heating rod 7, when the working heating rod 7 is affected by impurities, resulting in a decrease in heat dissipation and thus affecting the detection accuracy, the weight of the working heating rod 7 increases due to the impurities. The adjustment component 6 senses the weight change of the working heating rod 7, causing it to descend and the backup heating rod 7 to rise, thus switching the working states of the two. This ensures that the airflow sensor maintains its optimal working state and improves the detection accuracy of the airflow sensor. At the same time, the descent of the working heating rod 7 allows its outer wall to contact the top cover 8, effectively removing impurities. The alternating use of the two heating rods 7 extends the detection life of the airflow sensor.

[0040] As one embodiment of the present invention, refer to Figure 2 , Figure 3 , Figure 4 , Figure 8 and Figure 9 The inner wall of the upper shell 2 has a longitudinally arranged limiting groove 202, and the inner wall of the outer shell 1 has a longitudinally arranged positioning groove 101. The width of the limiting groove 202 is greater than the width of the positioning groove 101, which facilitates the engagement of the sliding plate 5 with the limiting groove 202 during rotation. The side walls of both the limiting groove 202 and the positioning groove 101 are chamfered. When the projection of the limiting groove 202 covers the projection of the positioning groove 101 from a top-view perspective, the sliding plate 5 engages with the limiting groove 202 and the positioning groove 101. In the positioning groove 101, the chamfered design facilitates the guide plate 5 to engage with the limiting groove 202 and the positioning groove 101. The power storage component 3 includes a housing 301, a torsion spring 302, a ratchet 303, a pawl 304, and fins 305. The housing 301 is connected to the upper side of the outer wall of the outer shell 1 and is rotatably connected to the outer shell 1. The upper side of the housing 301 is rotatably connected to the upper shell 2. The torsion spring 302 is disposed in the inner cavity of the housing 301, and both ends of the torsion spring 302 are... The upper shell 1 is connected to the outer shell 301 and the lower shell 2 respectively. The lower end of the torsion spring 302 is connected to the outer shell 301, and the upper end of the torsion spring 302 is connected to the upper shell 2. The ratchet 303 is fixedly connected to the outer wall of the outer shell 1. The pawl 304 is fixedly connected to the outer shell 301. The pawl 304 is made of elastic metal and can rotate unidirectionally on the surface of the ratchet 303. The fin array 305 is connected to the outer wall of the outer shell 301. When the airflow passes through the fins 305, it can carry... The moving fin 305 rotates, and the slide 201 is divided into an ascending section 2011 and a descending section 2012. Both the ascending section 2011 and the descending section 2012 are opened on the inner wall of the upper shell 2. When the adjusting component 6 contacts the ascending section 2011, it is in an ascending position. When the adjusting component 6 contacts the descending section 2012, it is in a descending position. The bottom wall of the descending section 2012 is connected with protrusions 20121, and the protrusions 20121 and the bottom wall of the descending section 2012 are transitioned by an arc angle.

[0041] By setting up the energy storage component 3, an airflow sensor is installed in the pipe to measure the airflow velocity in the pipe. When the airflow passes through the fin 305, it will drive the fin 305 to rotate counterclockwise. The fin 305 drives the ratchet 303 to rotate counterclockwise. At this time, the pawl 304 slides over the surface of the ratchet 303. When the housing 301 rotates, it will exert force on the torsion spring 302. At this time, since the slide plate 5 is engaged in the limiting groove 202 and the positioning groove 101, the angle between the outer shell 1 and the upper shell 2 is fixed, and the torsion spring 302 begins to store energy. When the slide plate 5 separates from the limiting groove 202 and the positioning groove 101, the kinetic energy stored in the torsion spring 302 begins to be released. Since the housing 301 is limited by the pawl 304 and the ratchet 303, the kinetic energy stored in the torsion spring 302 will drive the upper shell 2 to rotate. The rotation of the upper shell 2 causes the slide groove 201 to rotate, thereby adjusting the height of the adjustment component 6 in the slide groove 201. This causes the working heating rod 7 to move downward, removing impurities from its surface. The spare heating rod 7 moves upward, replacing the working heating rod 7, thus enabling long-term monitoring by the airflow sensor. Simultaneously, when the working heating rod 7 moves downward, the adjustment component 6 in the descending section 2012 contacts the protrusion 20121. The protrusion 20121 pushes the adjustment component 6 upward briefly, causing the working heating rod 7 to have a slight upward trend while maintaining a large downward trend. This allows the working heating rod 7 to move slightly upward after some of the attached impurities are scraped off by the upper cover 8, facilitating the airflow to carry away impurities from the surface of the upper cover 8 and preventing impurities from being pressed and fixed.

[0042] As one embodiment of the present invention, refer to Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9The adjusting assembly 6 includes a tension spring 601, a sleeve 602, a slide rod 603, a pin 604, and a spring 605. The tension spring 601 is fixedly connected to the top of the inner cavity of the outer casing 1, the sleeve 602 is fixedly connected to the top of the tension spring 601, the slide rod 603 passes through the sleeve 602, and one end of the slide rod 603 extends into the slide groove 201, and will rise or fall according to the rising section 2011 and the falling section 2012 of the slide groove 201. The slide rod 603 is rotatably connected to the sleeve 602, the pin 604 is connected to the slide rod 603, and the length of the pin 604 on both sides of the slide rod 603 is different. Therefore, the pin 604 forms a long end and a short end with the slide rod 603 as the midpoint. The spring 605 connects to... At the short end of pin 604, spring 605 exerts a downward pulling force on pin 604. The long end of pin 604 is attached to the lower end of heating rod 7. When impurities adhere to heating rod 7, it causes a change in the weight of heating rod 7, causing heating rod 7 to press against the long end of pin 604, making the short end of pin 604 tilt upwards. The design of the long end of pin 604 allows heating rod 7 to rotate with only a small change in weight. A rectangular groove 402 is provided in the middle of partition 4, and the other end of slide rod 603 extends into the rectangular groove 402. The two slide rods 603 on the two adjusting components 6 do not contact each other when moving in the rectangular groove 402. The slide bar 6031 has slots 6031 on both sides. The slots 6031 change the diameter of the slide bar 603. By rotating the angle of the slide bar 603, the support position of the slide bar 603 on the slide plate 5 can be changed. When the slots 6031 face the slide plate 5, that is, when the slots 6031 are vertical, the slide plate 5 will lose support. There are two slide plates 5, which are distributed one in front of the other. The slide plate 5 includes a locking plate 501, a double-layer metal spring 502, and a baffle 503. The locking plate 501 and the baffle 503 are slidably connected in the partition 4. The locking plate 501 is close to the front and rear sides of the partition 4, and the baffle 503 is close to the middle of the partition 4. The locking plate 501 is engaged with the limiting groove 202 and the positioning groove 101. The double-layer metal spring 502 is connected between the clamping plate 501 and the baffle 503. The two ends of the double-layer metal spring 502 are fixedly connected to the clamping plate 501 and the baffle 503 respectively. The double-layer metal spring 502 is made of two different metal materials, and the two different metal materials have different coefficients of thermal expansion. When the slide plate 5 is engaged in the limiting groove 202 and the positioning groove 101, the double-layer metal spring 502 is in a deformation and energy storage state. When the projection of the limiting groove 202 covers the projection of the positioning groove 101 from the top view, the double-layer metal spring 502 releases energy instantly, pushing the slide plate 5 to engage in the limiting groove 202 and the positioning groove 101, ensuring the stability of the slide plate 5 locking the upper shell 2 and the outer shell 1.

[0043] Simultaneously, when the airflow sensor at this point on the detection line detects an abnormality, the backup heating rod 7 can be activated. This allows the backup heating rod 7 to release heat within the upper shell 2, causing the double-layer metal spring 502 to thermally expand. Since the thermal expansion coefficients of the double-layer metal spring 502 are different, the double-layer metal spring 502 will bend. The distance between the two ends of the bent double-layer metal spring 502 shortens, thereby causing the clamping plate 501 to separate from the limiting groove 202 and the positioning groove 101. This achieves the purpose of adjusting the heating rod 7 in case of a fault. The gap between the adjacent sides of the two baffles 503 gradually decreases from bottom to top, causing the sliding rod 603 to move upwards and contact the baffle 503. During the process, the pressure of the baffle 503 on the slide rod 603 gradually increases, which increases the resistance to the upward movement of the slide rod 603. The side of the clamping plate 501 away from the baffle 503 is arc-shaped, that is, the side of the clamping plate 501 near the inner wall of the upper shell 2 is arc-shaped. When the upper shell 2 rotates, the clamping plate 501 is attached to the inner wall of the upper shell 2. The side of the clamping plate 501 near the upper shell 2 is arc-shaped, which makes the clamping plate 501 and the upper shell 2 in line contact, effectively reducing the contact area between the clamping plate 501 and the upper shell 2 and reducing friction. A push spring 401 is connected between the baffle 503 and the partition 4. When the slide plate 5 loses support, the push spring 401 pushes the two baffles 503 to move closer to each other.

[0044] By setting the adjustment component 6, when the weight of the working heating rod 7 changes, the working heating rod 7 will move downward. The top of the pin block 604 will deflect downward under the pressure of the working heating rod 7. At this time, the spring 605 will open, and the rotation of the pin block 604 will change the angle of the slide rod 603 extending into the bayonet 6031 in the rectangular groove 402, causing the adjacent sides of the two baffles 503 to lose support. The push spring 401 pushes the two baffles 503 to move closer to each other. The movement of the baffles 503 drives the bayonet 501 to move, causing the upper shell 2 to lose its limit. The torsion spring 302 drives the upper shell 2 to rotate. When the upper shell 2 rotates, it will change the contact position between the slide rod 603 and the slide groove 201, so that the two slide rods 603 contact the rising section 2011 and the falling section 2012 respectively. The slide rod 603 on the rising section 2011 drives the heating rod 605 to move downward. As the heating rod 7 moves upward, the slide rod 603 on the descending section 2012 drives the heating rod 7 downward. During the upward movement, the slide rod 603 on the ascending section 2011 comes into contact with two baffles 503. Since the gap between the adjacent sides of the two baffles 503 gradually decreases from bottom to top, the resistance exerted by the baffles 503 on the slide rod 603 gradually increases during the upward movement and contact with the baffles 503. This achieves variable speed upward movement of the slide rod 603, i.e., a fast speed in the initial stage of upward movement to reduce the pause gap monitored by the airflow sensor, and a slower speed in the later stage of upward movement to reduce the impact on the heating rod 7 during pauses. On the other hand, the resistance of the slide rod 603 in upward movement reduces the rotation speed of the upper shell 2, which facilitates the engagement of the locking plate 501 with the limiting groove 202 and the positioning groove 101.

[0045] Before operation, fix the airflow sensor to the movable block, then connect the movable block to the pipe with screws, rotate the housing 301, and apply force to the torsion spring 302.

[0046] When working, the airflow passes through the surface of the heating rod 7 and takes away the temperature of the surface of the heating rod 7. At this time, in order to maintain the temperature of the surface of the heating rod 7, the input current to the heating rod 7 will be increased. By measuring the change in the current, the intensity of the airflow can be determined.

[0047] As the measurement proceeds, impurities in the airflow gradually adhere to the working heating rod 7, increasing its weight. Consequently, the working heating rod 7 shifts downwards, causing the top of the pin 604 to deflect downwards under the pressure of the working heating rod 7. This rotation of the pin 604 alters the angle at which the slide rod 603 extends into the bayonet 6031 in the rectangular groove 402, resulting in the adjacent sides of the two baffles 503 losing support. The push spring 401 then pushes the two baffles 503 closer together, and the movement of the baffles 503 causes the bayonet 501 to move. As a result, the upper shell 2 loses its limit, and the torsion spring 302 drives the upper shell 2 to rotate. When the upper shell 2 rotates, the slide rod 603 on the lower side of the working heating rod 7 slides along the descending section 2012, and the slide rod 603 on the lower side of the spare heating rod 7 slides along the ascending section 2011. As a result, the spare heating rod 7 extends and becomes the working heating rod 7 to perform measurement operations, while the descending working heating rod 7 becomes the spare heating rod 7. During the downward movement, the outer wall of the heating rod 7 contacts the upper cover 8, which effectively removes impurities from the outer wall of the heating rod 7.

[0048] To improve the removal effect of impurities on the surface of the heating rod 7, a protrusion 20121 is provided in the descending section 2012. When the working heating rod 7 moves down, the slide rod 603 will contact the protrusion 20121. The protrusion 20121 will push the slide rod 603 to move up briefly, so that while the working heating rod 7 maintains a large downward trend, it will move up slightly. After the working heating rod 7 has some of the attached impurities scraped off by the upper cover 8, it will move up slightly, which makes it easier for the airflow to carry away the impurities on the surface of the upper cover 8.

[0049] When a single sensor in the detection route malfunctions, the problem is detected by replacing the heating rod 7. By turning on the backup heating rod 7, the backup heating rod 7 releases heat in the inner cavity of the upper shell 2. The temperature causes the double-layer metal spring 502 to expand thermally. Since the thermal expansion coefficients of the double-layer metal spring 502 are different, the double-layer metal spring 502 will bend. The distance between the two ends of the bent double-layer metal spring 502 is shortened, which in turn causes the clamping plate 501 to separate from the limiting groove 202 and the positioning groove 101. At this time, the upper shell 2 rotates, extending the backup heating rod 7. At the same time, since the double-layer metal spring 502 loses its heat source and its temperature drops, it is clamped after the upper shell 2 rotates.

[0050] Although embodiments of the invention have been described, those skilled in the art can make variations and modifications to the embodiments with an understanding of the principles and spirit of the invention, and other effects can be obtained. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A redundant airflow sensor with fault self-healing function, comprising a housing (1), characterized in that: It also includes an upper shell (2), a power storage component (3), a partition (4), a sliding plate (5), an adjustment component (6), a heating rod (7), and an upper cover (8). The upper shell (2) is connected to the upper side of the outer shell (1). The power storage component (3) is connected to the outer wall of the outer shell (1) and is connected to the upper shell (2). The partition (4) is connected to the middle of the inner cavity of the outer shell (1). The sliding plate (5) is connected in the partition (4). The two adjustment components (6) are respectively connected to the left and right sides of the inner cavity of the outer shell (1). The two heating rods (7) are respectively connected to the upper side of the two adjustment components (6). The upper cover (8) is connected to the upper side of the partition (4). The inner wall of the upper shell (2) is provided with a sliding groove (201). The sliding groove (201) is arranged in an inclined manner. The two adjustment components (6) are connected in the sliding groove (201). Initially, the sliding plate (5) locks the outer shell (1) and the upper shell (2). When the weight of the heating rod (7) reaches a specified level, the adjustment component (6) causes the sliding plate (5) to move and release the lock between the outer shell (1) and the upper shell (2). When the upper shell (2) drives the sliding groove (201) to rotate under the action of the power storage component (3), the two heating rods (7) rise and fall alternately along the sliding groove (201). The inner wall of the upper shell (2) is provided with a longitudinally arranged limiting groove (202), and the inner wall of the outer shell (1) is provided with a longitudinally arranged positioning groove (101). The side walls of the limiting groove (202) and the positioning groove (101) are both provided with chamfers. When the projection of the limiting groove (202) covers the projection of the positioning groove (101) from a top view, the sliding plate (5) is engaged in the limiting groove (202) and the positioning groove (101). The power storage component (3) includes a housing (301), a torsion spring (302), a ratchet (303), a pawl (304), and fins (305). The housing (301) is connected to the upper side of the outer wall of the outer shell (1). The torsion spring (302) is disposed in the inner cavity of the housing (301), and the two ends of the torsion spring (302) are respectively connected to the housing (301) and the upper shell (2). The ratchet (303) is connected to the outer wall of the outer shell (1). The pawl (304) is connected to the housing (301). The fins (305) array is connected to the outer wall of the housing (301). The adjustment assembly (6) includes a tension spring (601), a sleeve (602), a slide rod (603), a pin (604), and a spring (605). The tension spring (601) is connected to the top of the inner cavity of the outer shell (1). The sleeve (602) is connected to the top of the tension spring (601). The slide rod (603) passes through the sleeve (602), and one end of the slide rod (603) extends into the slide groove (201). The pin (604) is connected to the slide rod (603), and the length of the pin (604) is different on both sides of the slide rod (603). The spring (605) is connected to the short end of the pin (604), and the long end of the pin (604) is attached to the lower end of the heating rod (7). The partition (4) has a rectangular groove (402) in the middle, and the other end of the slide rod (603) extends into the rectangular groove (402). The slide plate (5) includes a retaining plate (501), a double-layer metal spring (502) and a baffle (503). The retaining plate (501) and the baffle (503) are slidably connected in the partition (4). The double-layer metal spring (502) is connected between the retaining plate (501) and the baffle (503). The double-layer metal spring (502) is made of two different metal materials.

2. The redundant airflow sensor with fault self-healing function according to claim 1, characterized in that: The gap between the two baffles (503) on adjacent sides gradually decreases from bottom to top, and the slide rod (603) extends into the rectangular groove (402) with slots (6031) on both sides.

3. A redundant airflow sensor with fault self-healing function according to claim 2, characterized in that: The side of the card plate (501) away from the baffle (503) is arc-shaped, and a push spring (401) is connected between the baffle (503) and the partition (4).

4. A redundant airflow sensor with fault self-healing function according to claim 1, characterized in that: The slide (201) is divided into an ascending section (2011) and a descending section (2012). The ascending section (2011) and the descending section (2012) are both formed on the inner wall of the upper shell (2). The bottom wall of the descending section (2012) is connected with a protrusion (20121), and the protrusion (20121) and the bottom wall of the descending section (2012) are connected by an arc angle.

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