Redundant design airflow sensor with fault self-healing function

Abstract

The invention relates to the technical field of sensors, in particular to a redundant design airflow sensor with a fault self-healing function, which comprises a shell, and further comprises 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, and the force storage assembly is connected to the outer wall of the shell; the partition plate is connected to the middle of an inner cavity of the shell, the sliding plate is connected into the partition plate, the two adjusting assemblies are connected to the left side and the right side of the inner cavity of the shell respectively, the two heating rods are connected to the upper sides of the two adjusting assemblies respectively, the upper side of the partition plate is connected with the upper cover, and a sliding groove is formed in the inner wall of the upper shell. According to the air flow sensor, the two heating rods are arranged, the upper shell rotates to enable the two heating rods to alternately stretch out, the stability of the air flow sensor is guaranteed, the outer walls of the descending heating rods can make contact with the upper cover, impurity attachments are removed, and the purpose of prolonging the service life of the air flow sensor is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensors, in particular to a redundant design airflow sensor with fault self-healing function. BACKGROUND

[0002] The airflow sensor is one of intelligent sensors, mainly used for measuring the flow rate or flow of air or other gases, and can convert the flow information of the gas into an electrical signal that can be read and processed, and the hot airflow sensor is one of the most common devices, which has the advantages of fast response speed and high precision, and is often used for monitoring the flow rate of airflow in a pipeline.

[0003] The working principle of the hot airflow sensor is that a heated metal wire is arranged in the sensor, when the airflow passes through, the airflow will take away the heat of the metal wire, so that the metal wire cools down, the faster the flow rate of the airflow, the more heat taken away, and the more obvious the temperature drop of the metal wire, and by measuring the current required to maintain its constant temperature, the mass flow rate of air can be accurately calculated, but the measurement of the hot airflow sensor requires the airflow to pass through the metal wire, and then when the airflow passes through the metal wire, the impurities in the airflow will contact and adhere to the metal wire, and with the passage of time, the impurities on the surface of the metal wire will gradually increase, resulting in a decrease in the heat dissipation capacity of the metal wire, and thus causing inaccurate detection of the hot airflow sensor.

[0004] In view of the above problems, some solutions are proposed in the prior art, for example, through redundant design, that is, by arranging a standby metal wire, when a single metal wire is damaged, the standby metal wire is replaced to realize the purpose of prolonging the working time of the hot airflow sensor, but when used in a factory, the production activities in the factory will cause more impurities in the air, and thus when detecting the exhaust airflow, the impurities will adhere to the surface of the metal wire at a fast speed, thereby seriously affecting the working time of the hot airflow sensor.

[0005] Therefore, a redundant design airflow sensor with fault self-healing function is proposed. SUMMARY

[0006] The purpose of the present application is to provide a redundant design airflow sensor with fault self-healing function, which solves the problem of rapid adhesion of impurities on the metal wire when the content of impurities in the air is high, thereby causing a decrease in the heat dissipation effect of the metal wire and affecting the detection precision, by arranging two heating rods, when the upper shell rotates, the two heating rods are alternately extended, thereby ensuring the reliability of the airflow sensor, and the descent of the heating rod makes the outer wall of the heating rod contact the upper cover, which can effectively remove the impurities and prolong the service life of the airflow sensor.

[0007] To achieve the above purpose, the present application provides the following technical scheme:

[0008] The application discloses a redundant design airflow sensor with a 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 and connected to the upper 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, the two adjusting assemblies are respectively connected to the left and right sides of the inner cavity of the shell, the 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, the sliding groove is arranged in an inclined manner, the two adjusting assemblies are connected to the two sides of the sliding groove, the sliding plate is locked with the shell and the upper shell at the beginning, when the weight of the heating rod reaches a specified degree, the adjusting assembly moves the sliding plate to release the locking between the shell and the upper shell, and when the upper shell drives the sliding groove to rotate under the action of the force storage assembly, the two heating rods are staggered up and down along the sliding groove.

[0009] Through the above scheme, the two heating rods are arranged alternately and used alternately, so that the airflow sensor can be kept in the best working state, and the detection accuracy of the airflow sensor is improved, and the falling of the heating rod can make the outer wall of the heating rod contact the upper cover, so that the impurity attachments can be effectively removed.

[0010] Preferably, the inner wall of the upper shell is provided with a limiting groove arranged in a longitudinal direction, the inner wall of the shell is provided with a positioning groove arranged in a longitudinal direction, the side walls of the limiting groove and the positioning groove are provided with chamfers, and when the projection of the limiting groove covers the projection of the positioning groove in a top view, the sliding plate is clamped into the limiting groove and the positioning groove.

[0011] Through the above scheme, the side walls of the limiting groove and the positioning groove are provided with chamfers, so that the sliding plate can be conveniently clamped into the limiting groove and the positioning groove, the locking angle between the shell and the upper shell is realized, and the force of the force storage assembly can be conveniently provided by the airflow.

[0012] Preferably, the force storage assembly comprises a sleeve shell, a torsional spring, a ratchet wheel, a pawl and fins, the sleeve shell is connected to the upper side of the outer wall of the shell, the torsional spring is arranged in the inner cavity of the sleeve shell and connected to the sleeve shell and the upper shell at two ends, the ratchet wheel is connected to the outer wall of the shell, the pawl is connected to the sleeve shell, and the fins are arranged on the outer wall of the sleeve shell.

[0013] Through the above scheme, when the airflow passes through the fins, the sleeve shell can be driven to rotate, so that the force of the torsional spring can be provided by the flow of the airflow, and the purpose of driving the upper shell and adjusting the angle of the upper shell is achieved.

[0014] Preferably, the adjusting assembly comprises a tension spring, a sleeve frame, a sliding rod, a pin block and a tension spring, the tension spring is connected at the top of the inner cavity of the shell, the sleeve frame is connected at the top of the tension spring, the sliding rod penetrates through the sleeve frame and one end of the sliding rod extends into the sliding groove, the pin block is connected on the sliding rod and the length of the pin block on both sides of the sliding rod is different, the short end of the pin block is connected with the tension spring, and the long end of the pin block is attached to the lower end of the heating rod.

[0015] Through the above scheme, the length of the pin block on the sliding rod is set, the length of the force arm of the pin block is changed, the long force arm is attached to the heating rod, the short force arm is connected with the tension spring, and when impurities are attached to the surface of the heating rod, even if the impurities are less, the pin block can drive the sliding rod to rotate.

[0016] Preferably, a rectangular slot is formed in the middle of the partition plate, the other end of the sliding rod extends into the rectangular slot, the sliding plate comprises a clamping plate, a double-layer metal spring sheet and a baffle, the clamping plate and the baffle are both slidingly connected in the partition plate, the double-layer metal spring sheet is connected between the clamping plate and the baffle, and the double-layer metal spring sheet is made of two different metal materials.

[0017] Through the above scheme, the double-layer metal spring sheet is made of two different metal materials, and when the double-layer metal spring sheet is heated, the two materials will expand at different amplitudes, and by limiting the baffle, the clamping plate can be moved towards the baffle, thereby unlocking the shell and the upper shell, and achieving the switching of the faulty heating rod.

[0018] Preferably, the gap between the adjacent sides of the two baffles gradually decreases from bottom to top, and the part of the sliding rod extending into the rectangular slot is provided with a bayonet on both sides, whereby the gap between the adjacent sides of the baffles gradually decreases from bottom to top, thereby changing the resistance when the sliding rod moves upwards, and achieving the purpose of adjusting the rotating speed of the upper shell.

[0019] The side of the clamping plate away from the baffle is arc-shaped, and a push spring is connected between the baffle and the partition plate, whereby the side of the clamping plate away from the baffle is arc-shaped, which can effectively reduce the friction between the clamping plate and the baffle when the upper shell rotates.

[0020] Preferably, the sliding groove is divided into an ascending section and a descending section, the ascending section and the descending section are both formed on the inner wall of the upper shell, the bottom wall of the descending section is arrayed with protrusions, and the protrusions and the bottom wall of the descending section are connected through an arc corner.

[0021] Through the above scheme, when the sliding rod moves in the descending section of the sliding groove, the main trend is downward, but small amplitude rises are intermittently generated in the process of descending, thereby facilitating the airflow to carry away the attached matters and avoiding the accumulation of the attached matters.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1. The application solves the problem that when the impurity content in the air is high, the impurities quickly adhere to the metal wire, thereby causing the heat dissipation effect of the metal wire to decrease, affecting the detection precision. Two heating rods are provided. When the weight change of the heating rod sensed by the adjusting assembly reaches a specified degree, the force storage assembly will drive the upper shell to rotate, causing the working heating rod to descend along the descending section, and the standby heating rod to rise, thereby ensuring that the air flow sensor remains in the best working state. When the heating rod descends, the outer wall of the heating rod contacts the upper cover, which can effectively remove the impurity deposits. When the heating rod moves downward, the slide rod contacts the protrusion, which causes the working heating rod to have a small upward trend while maintaining a large downward trend, thereby causing the working heating rod to slightly move upward after some of the adhering impurities are scraped off by the upper cover, thereby facilitating the air flow to carry away the impurities on the surface of the upper cover, achieving the purpose of avoiding impurity accumulation.

[0024] 2. By providing an adjusting assembly, when the weight of the heating rod increases, the angle of the slide rod extending into the rectangular slot is changed, causing the adjacent sides of the two baffles to lose support, and the torsional spring drives the upper shell to rotate. When the slide rod moves in the ascending 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 during the process of the slide rod moving upward and contacting the baffles. On the one hand, this achieves a fast speed at the initial stage of the slide rod moving upward, which reduces the air flow sensor monitoring pause gap, and a slow speed at the later stage of the slide rod moving upward, which reduces the impact force on the heating rod during the pause. On the other hand, the resistance of the slide rod moving upward reduces the rotation speed of the upper shell, thereby facilitating the clamping plate to be clamped with the limiting slot and the positioning slot.

[0025] 3. By providing a slide plate, when the slide rod pushes the slide plate to be clamped into the limiting slot and the positioning slot, the double-layer metal spring will deform to store energy. When the limiting slot and the positioning slot coincide, the double-layer metal spring will instantaneously release energy to push the slide plate to be clamped into the limiting slot and the positioning slot, ensuring the stability of the slide plate locking the upper shell and the outer shell. At the same time, opening the standby heating rod in the inner cavity of the upper shell will cause the double-layer metal spring to expand due to heat, thereby causing the double-layer metal spring to bend. The distance between the two ends of the bent double-layer metal spring is shortened, thereby driving the clamping plate to separate from the limiting slot and the positioning slot, achieving the purpose of exchanging the heating rod in case of failure. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the whole application;

[0027] Figure 2 It is an enlarged schematic diagram of A in the application; Figure 1

[0028] Figure 3 It is a structural schematic diagram of the sliding groove part of the application; ​

[0029] Figure 4 Structure diagram of the power storage assembly part of the present application;

[0030] Figure 5 Structure diagram of the adjusting assembly part of the present application;

[0031] Figure 6 Structure diagram of the sliding plate part of the present application;

[0032] Figure 7 Structure diagram of the ascending section and descending section part of the present application;

[0033] Figure 8 Structure diagram of the protruding block part of the present application;

[0034] Figure 9 State diagram of the present application when switching the heating rod.

[0035] In the figure: 1, outer shell; 101, positioning groove; 2, upper shell; 201, sliding groove; 2011, ascending section; 2012, descending section; 20121, protruding block; 202, limiting groove; 3, power storage assembly; 301, sleeve shell; 302, torsional spring; 303, ratchet wheel; 304, pawl; 305, fin; 4, partition plate; 401, push spring; 402, rectangular groove; 5, sliding plate; 501, clamping plate; 502, double-layer metal spring piece; 503, baffle; 6, adjusting assembly; 601, pull spring; 602, sleeve frame; 603, sliding rod; 6031, clamping opening; 604, pin block; 605, spring; 7, heating rod; 8, upper cover. DETAILED DESCRIPTION

[0036] The technical solutions of the embodiments of the present application are described clearly and completely below in combination with the drawings of the embodiments of the present application, so that the working states and structural features of the embodiments of the present application are more detailed. Obviously, the described embodiments are only some of the embodiments of the present application, and are not complete embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creativity are within the protection scope of the present application.

[0037] Please refer to Figures 1 to 9 The present application provides a redundant design airflow sensor with fault self-recovery function, and the technical solutions are as follows:

[0038] Specifically, please refer to Figures 1 to 9The utility model provides a kind of redundant design airflow sensor with fault self-healing function, by multiple airflow sensors constitute intelligent sensing system, can be used for the monitoring of airflow velocity in pipeline, airflow sensor is installed in pipeline, the lower side of pipeline is connected with movable block, movable block is connected between pipeline by screw, by disassembling movable block, to carry out maintenance to the fault of airflow sensor, airflow sensor includes shell 1, also includes upper shell 2, force storage assembly 3, baffle 4, sliding plate 5, adjusting assembly 6, heating rod 7 and upper cover 8, shell 1 is connected by screw on movable block on pipeline, upper shell 2 is connected on the upper side of shell 1, upper shell 2 is rotatably connected with shell 1, force storage assembly 3 is connected on the outer wall of shell 1, and force storage assembly 3 is connected with upper shell 2, baffle 4 is connected in the middle of the inner chamber of shell 1, the bottom wall of baffle 4 is fixedly connected with the bottom wall of the inner chamber of shell 1, the side wall of baffle 4 is not connected with shell 1 and upper shell 2, sliding plate 5 is connected in baffle 4, two adjusting assemblies 6 are respectively connected in the left and right sides of the inner chamber of shell 1, i.e.

[0039] By setting two heating rods 7, one is the working heating rod 7 and the other is the spare heating rod 7, when the working heating rod 7 is affected by impurities and attachments, resulting in a decrease in the heat dissipation effect and thus affecting the detection accuracy, the working heating rod 7 is affected by the impurities and attachments and causes the weight to increase. The adjusting component 6 senses the weight change of the working heating rod 7, drives the working heating rod 7 to descend, raises the spare heating rod 7, and switches the working states of the two, thereby ensuring that the airflow sensor maintains the best working state and improving the detection accuracy of the airflow sensor. At the same time, the descent of the working heating rod 7 causes the outer wall of the working heating rod 7 to contact the upper cover 8, which can effectively remove impurities and attachments. The staggered use of the two heating rods 7 extends the detection life of the airflow sensor.

[0040] As an 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 is provided with a longitudinal limiting groove 202, and the inner wall of the outer shell 1 is provided with a longitudinal positioning groove 101. The width of the limiting groove 202 is greater than the width of the positioning groove 101, so that the slide 5 is convenient for engaging with the limiting groove 202 during the rotation process. The side walls of the limiting groove 202 and the positioning groove 101 are both chamfered. When the projection of the limiting groove 202 covers the projection of the positioning groove 101 from a top view, the slide 5 is engaged with the limiting groove 202 and In the positioning groove 101, the chamfered setting facilitates the guide slide 5 to be clamped into the limit groove 202 and the positioning groove 101. The power storage component 3 includes a sleeve 301, a torsion spring 302, a ratchet 303, a pawl 304 and a fin 305. The sleeve 301 is connected to the upper side of the outer wall of the shell 1. The sleeve 301 is rotatably connected to the shell 1. The upper side of the sleeve 301 is rotatably connected to the upper shell 2. The torsion spring 302 is set in the inner cavity of the sleeve 301, and the two ends of the torsion spring 302 are connected. They are connected to the casing 301 and the upper casing 2 respectively. The lower end of the torsion spring 302 is connected to the casing 301, and the upper end of the torsion spring 302 is connected to the upper casing 2. The ratchet 303 is fixedly connected to the outer wall of the outer casing 1. The pawl 304 is fixedly connected to the casing 301. The pawl 304 is made of elastic metal material. The pawl 304 can rotate unidirectionally on the surface of the ratchet 303. The fin 305 array is connected to the outer wall of the casing 301. When the airflow passes through the fin 305, it can bring The movable wing 305 rotates, and the slide groove 201 is divided into an ascending section 2011 and a descending section 2012. The ascending section 2011 and the descending section 2012 are both 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 shape. When the adjusting component 6 contacts the descending section 2012, it is in a descending shape. The bottom wall array 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 transitioned through an arc angle.

[0041] By setting the force storage assembly 3, the airflow sensor is installed in the pipeline for measuring the airflow velocity in the pipeline, when the airflow passes through the fin 305, the fin 305 is driven 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, the sleeve 301 rotates and exerts force on the torsional spring 302, at this time the slide plate 5 is clamped into the limiting groove 202 and the positioning groove 101, and the angle between the shell 1 and the upper shell 2 is fixed, the torsional spring 302 starts to store energy, when the slide plate 5 is separated from the limiting groove 202 and the positioning groove 101, the kinetic energy stored in the torsional spring 302 starts to release, since the sleeve 301 is limited by the pawl 304 and the ratchet 303, the kinetic energy stored in the torsional spring 302 drives the upper shell 2 to rotate, the rotation of the upper shell 2 drives the slide groove 201 to rotate, thereby adjusting the height of the adjusting assembly 6 in the slide groove 201, so that the working heating rod 7 moves downward, removes the impurities on the surface of the working heating rod 7, the standby heating rod 7 moves upward, replaces the working heating rod 7, thereby realizing long-time monitoring of the airflow sensor, and when the working heating rod 7 moves downward, the adjusting assembly 6 in the descending section 2012 contacts the protrusion 20121, the protrusion 20121 pushes the adjusting assembly 6 to move upward temporarily, thereby making the working heating rod 7 have a small upward trend while maintaining a large downward trend, thereby realizing that the working heating rod 7 slightly moves upward after being scraped by the upper cover 8 to remove some attached impurities, thereby facilitating the airflow to remove the impurities on the surface of the upper cover 8 to avoid the impurities being fixed under pressure.

[0042] As an embodiment of the present application, refer to Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9The adjusting assembly 6 comprises a tension spring 601, a sleeve frame 602, a sliding rod 603, a pin block 604 and a spring 605. The tension spring 601 is fixedly connected to the top of the inner cavity of the shell 1. The sleeve frame 602 is fixedly connected to the top of the tension spring 601. The sliding rod 603 penetrates through the sleeve frame 602 and extends into the sliding groove 201. The sliding rod 603 is rotatably connected to the sleeve frame 602. The pin block 604 is connected to the sliding rod 603. The length of the pin block 604 on both sides of the sliding rod 603 is different, so that the pin block 604 forms a long end and a short end with the sliding rod 603 as the midpoint. The spring 605 is connected to the short end of the pin block 604 and generates a downward pulling force on the pin block 604. The long end of the pin block 604 is attached to the lower end of the heating rod 7. When impurities adhere to the heating rod 7, the weight of the heating rod 7 changes, and the heating rod 7 presses the long end of the pin block 604, so that the short end of the pin block 604 is raised. The long end of the pin block 604 is arranged to enable the heating rod 7 to press and rotate the pin block 604 only by a small weight change. A rectangular groove 402 is formed in the middle of the partition plate 4. The other end of the sliding rod 603 extends into the rectangular groove 402. The two sliding rods 603 on the two adjusting assemblies 6 do not contact when moving in the rectangular groove 402. The two sides of the part of the sliding rod 603 extending into the rectangular groove 402 are provided with a bayonet 6031. The bayonet 6031 changes the diameter of the sliding rod 603, so that the supporting position of the sliding rod 603 on the sliding plate 5 can be changed by rotating the angle of the sliding rod 603. When the bayonet 6031 faces the sliding plate 5, that is, when the bayonet 6031 is vertical, the sliding plate 5 loses support. The number of the sliding plates 5 is two, and the two sliding plates 5 are distributed in front of and behind each other. The sliding plate 5 comprises a clamping plate 501, a double-layer metal spring sheet 502 and a baffle 503. The clamping plate 501 and the baffle 503 are both slidingly connected to the partition plate 4. The clamping plate 501 is close to the front and rear sides of the partition plate 4. The baffle 503 is close to the middle of the partition plate 4. The clamping plate 501 is clamped with the limiting groove 202 and the positioning groove 101. The double-layer metal spring sheet 502 is connected between the clamping plate 501 and the baffle 503. The two ends of the double-layer metal spring sheet 502 are fixedly connected to the clamping plate 501 and the baffle 503, respectively. The double-layer metal spring sheet 502 is made of two different metal materials from top to bottom, and the thermal expansion coefficients of the two different metal materials are different. When the sliding plate 5 is clamped into the limiting groove 202 and the positioning groove 101, the double-layer metal spring sheet 502 is in a deformed and energy-stored state. When the projection of the limiting groove 202 covers the projection of the positioning groove 101 in the top view, the double-layer metal spring sheet 502 instantaneously releases energy to push the sliding plate 5 to be clamped into the limiting groove 202 and the positioning groove 101, thereby ensuring the stability of the locking of the sliding plate 5, the upper shell 2 and the shell 1.

[0043] At the same time, when the airflow sensor at that point on the detection line detects an abnormality, the standby heating rod 7 can be turned on to release heat in the inner cavity of the upper shell 2. The temperature will cause the double-layer metal spring 502 to expand thermally, and the thermal expansion coefficients of the double-layer metal spring 502 are different, so that the double-layer metal spring 502 will bend, and the distance between the two ends of the bent double-layer metal spring 502 will be shortened, thereby driving the card plate 501 to separate from the limit groove 202 and the positioning groove 101, thereby achieving the purpose of adjusting the heating rod 7 when a fault occurs. The gap between the adjacent sides of the two baffles 503 gradually becomes smaller from bottom to top, and then the sliding rod 603 moves upward and contacts the baffle 503. During the process, the pressure of the baffle 503 on the slide bar 603 gradually increases, which increases the resistance of the slide bar 603 to move upward, and the side of the card plate 501 away from the baffle 503 is arc-shaped, that is, the side of the card plate 501 close to the inner wall of the upper shell 2 is arc-shaped. When the upper shell 2 rotates, the card plate 501 is attached to the inner wall of the upper shell 2, and the side of the card plate 501 close to the upper shell 2 is arc-shaped, which makes the card plate 501 and the upper shell 2 in line contact, effectively reducing the contact area between the card 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 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, and the top of the pin block 604 will be deflected downward by the pressure of the working heating rod 7. At this time, the spring 605 is opened, and the rotation of the pin block 604 changes the angle at which the slide bar 603 extends to the bayonet 6031 in the rectangular groove 402, so that the adjacent sides of the two baffles 503 lose support, and the push spring 401 pushes the two baffles 503 closer to each other. The movement of the baffle 503 drives the card plate 501 to move, so that 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 contact position of the slide bar 603 and the slide groove 201 will be changed, so that the two slide bars 603 are in contact with the ascending section 2011 and the descending section 2012 respectively, and the slide bar 603 on the ascending section 2011 drives the ascending section 2011 to move. The heating rod 7 moves upward, and the slide bar 603 on the descending section 2012 drives the heating rod 7 to move downward. The slide bar 603 on the ascending section 2011 will contact the two baffles 503 during the upward movement. Since the gap between the adjacent sides of the two baffles 503 gradually decreases from bottom to top, the resistance exerted by the baffle 503 on the slide bar 603 gradually increases during the process of the slide bar 603 moving upward and contacting the baffle 503. On the one hand, the speed of the slide bar 603 is changed to move upward, that is, the speed is fast in the initial stage of the upward movement to reduce the pause gap monitored by the airflow sensor, and the speed is slow in the later stage of the upward movement to reduce the impact on the heating rod 7 during the pause. On the other hand, the resistance of the slide bar 603 to the upward movement reduces the rotation speed of the upper shell 2, thereby facilitating the engagement of the card plate 501 with the limit groove 202 and the positioning groove 101.

[0045] Before work, the airflow sensor is fixed with the movable block, and then the movable block is connected with the pipeline through the screw. The sleeve shell 301 is rotated to apply force to the torsion spring 302;

[0046] During work, the airflow passing through the surface of the heating rod 7 will take away the temperature on the surface of the heating rod 7. At this time, in order to maintain the temperature on the surface of the heating rod 7, the input current of the heating rod 7 will be increased. By measuring the change of the current, the strength of the airflow can be known.

[0047] With the measurement, the impurities in the airflow will gradually adhere to the working heating rod 7, the weight of the working heating rod 7 will increase, and then the working heating rod 7 will move down. The top of the pin block 604 will be deflected downward under the pressure of the working heating rod 7. The rotation of the pin block 604 changes the angle of the sliding rod 603 extending into the rectangular slot 402. The adjacent sides of the two baffles 503 lose support, and the push spring 401 pushes the two baffles 503 to move closer to each other. The movement of the baffle 503 drives the clamping plate 501 to move, and then the upper shell 2 loses the limit. The torsion spring 302 drives the upper shell 2 to rotate. When the upper shell 2 rotates, the sliding rod 603 on the side of the working heating rod 7 slides along the descending section 2012, and the sliding rod 603 on the side of the standby heating rod 7 slides along the ascending section 2011. Thus, the standby heating rod 7 is extended, and the working heating rod 7 is changed to the standby heating rod 7 for measurement. During the downward movement, the outer wall of the heating rod 7 contacts the upper cover 8, and the impurities on the outer wall of the heating rod 7 are effectively removed.

[0048] In order to improve the removal effect of the impurities on the surface of the heating rod 7, a protrusion 20121 is arranged in the descending section 2012. When the working heating rod 7 moves down, the sliding rod 603 will contact the protrusion 20121. The protrusion 20121 will push the sliding rod 603 to move up temporarily. Thus, when the working heating rod 7 moves down as a whole, it will move up slightly. After the working heating rod 7 is scraped by the upper cover 8 to remove some of the adhering impurities, it will move up slightly, which facilitates the airflow to take away the impurities on the surface of the upper cover 8.

[0049] When an abnormality occurs in a single sensor in the detection route, it can be detected whether it is a problem of the heating rod 7 by replacing the heating rod 7. The standby heating rod 7 is turned on to heat in the inner cavity of the upper shell 2. The temperature causes the double-layer metal reed 502 to expand. The double-layer metal reed 502 has different thermal expansion coefficients, and thus the double-layer metal reed 502 will bend. The distance between the two ends of the bent double-layer metal reed 502 is shortened, and thus the clamping plate 501 is separated from the limiting slot 202 and the positioning slot 101. At this time, the upper shell 2 rotates to extend the standby heating rod 7. At the same time, the temperature of the double-layer metal reed 502 decreases due to the loss of heat source. After the upper shell 2 rotates, it is clamped.

[0050] Although embodiments of the present application have been described herein, it should be understood by those skilled in the art that changes can be made therein without departing from the spirit and scope of the present application, which is defined by the following claims and their equivalents.

Claims

1. A redundant airflow sensor with a fault self-healing function, comprising a housing (1), characterized in that: The utility model also includes an upper shell (2), a power storage component (3), a partition (4), a slide plate (5), an adjustment component (6), a heating rod (7) and an upper cover (8), wherein 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 the power storage component (3) 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 slide 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 sides of the two adjustment components (6), and the upper cover (8) is 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), and a slide groove (201) is provided on the inner wall of the upper shell (2). The slide groove (201) is arranged in an inclined shape. The two adjustment components (6) are connected in the slide groove (201). Initially, the slide 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 slide plate (5) to move to release the lock between the outer shell (1) and the upper shell (2). When the upper shell (2) drives the slide groove (201) to rotate under the action of the power storage component (3), the two heating rods (7) are staggered and lifted along the slide groove (201).

2. The redundant airflow sensor with fault self-healing function according to claim 1, characterized in that: 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) in a top view, the slide plate (5) is snapped into the limiting groove (202) and the positioning groove (101).

3. The redundant airflow sensor with fault self-healing function according to claim 2, characterized in that: The power storage assembly (3) comprises a casing (301), a torsion spring (302), a ratchet (303), a pawl (304) and a fin (305); the casing (301) is connected to the upper side of the outer wall of the outer shell (1); the torsion spring (302) is arranged in the inner cavity of the casing (301); and the two ends of the torsion spring (302) are respectively connected to the casing (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 casing (301); and the fin (305) array is connected to the outer wall of the casing (301).

4. The redundant airflow sensor with fault self-healing function according to claim 2, characterized in that: The adjustment component (6) includes a tension spring (601), a sleeve (602), a slide rod (603), a pin block (604) and a spring (605), wherein the tension spring (601) is connected to the top of the inner cavity of the 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 block (604) is connected to the slide rod (603), and the lengths of the pin block (604) on both sides of the slide rod (603) are different, the spring (605) is connected to the short end of the pin block (604), and the long end of the pin block (604) is attached to the lower end of the heating rod (7).

5. The redundant airflow sensor with fault self-healing function according to claim 4, characterized in that: A rectangular groove (402) is provided in the middle of the partition (4), and the other end of the slide rod (603) extends into the rectangular groove (402). The slide plate (5) includes a card plate (501), a double-layer metal spring (502) and a baffle (503). The card plate (501) and the baffle (503) are both slidably connected in the partition (4). The double-layer metal spring (502) is connected between the card plate (501) and the baffle (503). The double-layer metal spring (502) is made of two different metal materials, one above and one below.

6. The redundant airflow sensor with fault self-healing function according to claim 5, characterized in that: The gap between the adjacent sides of the two baffles (503) gradually decreases from bottom to top, and the portion of the slide bar (603) extending to the rectangular groove (402) is provided with bayonet holes (6031) on both sides.

7. The redundant airflow sensor with fault self-healing function according to claim 6, characterized in that: The side of the clamping 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).

8. The redundant airflow sensor with fault self-healing function according to claim 4, characterized in that: The chute (201) is divided into an ascending section (2011) and a descending section (2012), both of which are provided on the inner wall of the upper shell (2), and the bottom wall array 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 transitioned through an arc angle.

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