Airflow sensor with self-activating structure
By using a self-activating airflow sensor, the problems of standby power consumption and vibration damage of traditional airflow sensors are solved, achieving zero-power real-time monitoring and efficient vibration reduction, and adapting to complex working conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU SUNGOD SEMICON CO LTD
- Filing Date
- 2025-07-09
- Publication Date
- 2026-06-26
AI Technical Summary
Traditional airflow sensors still consume basic energy even when there is no airflow or in standby mode, and lack targeted vibration reduction protection, resulting in energy waste and structural fatigue damage.
The airflow sensor, which adopts a self-activating structure, uses a mechanical self-activating structure composed of a thin film and a micro switch to cut off power in the absence of airflow and instantly power on when airflow is triggered. It absorbs vibration energy through rack and pinion transmission and a multi-stage vibration reduction system to ensure real-time monitoring and vibration reduction.
It achieves zero standby power consumption, real-time response to sudden airflow changes, and efficient vibration reduction, improving the monitoring reliability and long-term stability of the sensor and adapting to the needs of different application scenarios.
Smart Images
Figure CN224416145U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of airflow sensor technology, specifically an airflow sensor with a self-activation structure. Background Technology
[0002] Airflow sensors, as key components for monitoring gas velocity, flow rate, or pressure, are widely used in HVAC, industrial process control, environmental monitoring, aerospace, and smart home applications. The main functions of airflow sensors include detecting and measuring the speed and direction of airflow. By detecting the pressure difference generated by the airflow, they calculate the airflow speed and direction, exhibiting high reliability, high sensitivity, and high measurement accuracy.
[0003] Traditional airflow sensors typically operate on a continuous power supply, requiring their core components (such as heating resistors and piezoelectric films) to maintain a constant operating state to ensure measurement accuracy. However, this mode results in inherent power consumption even when the sensor is not in operation or in standby mode. Existing low-power optimization techniques mainly rely on periodic wake-up mechanisms to reduce average power consumption through intermittent sampling. However, in periods without airflow, such solutions still wake up at fixed intervals and perform empty sampling, resulting in energy waste. Furthermore, low-frequency sampling may fail to capture sudden changes in airflow (such as transient airflow caused by industrial pipeline ruptures), leading to monitoring failure. In addition, airflow sensors are often exposed to mechanical vibration environments in practical applications (such as high-frequency vibrations from running fans and impacts from transportation equipment), and traditional designs lack targeted vibration reduction protection. Vibration stress accelerates sensor structural fatigue, leading to drift or damage. Utility Model Content
[0004] The purpose of this invention is to provide an airflow sensor with a self-activating structure to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an airflow sensor with a self-activating structure, comprising an airflow sensor, a mounting base below the airflow sensor, a mounting frame fixedly mounted above the airflow sensor, a vertically placed thin plate inside the mounting frame, a micro switch fixedly mounted on the mounting frame, the thin plate corresponding to the micro switch, fixed brackets fixedly mounted on both sides of the thin plate, two sets of slides slidably mounted on both sides of the mounting frame, the two sets of fixed brackets respectively fixedly connected to the corresponding inner slides, racks fixedly mounted on both sets of slides, gears provided between the two sets of racks, the gears respectively meshing with the two sets of racks, the racks rotatably connected to the mounting frame via a mounting shaft, the two sets of slides being centrally symmetrically distributed about the mounting shaft axis, a fixed rod corresponding to the slides fixedly mounted inside the mounting frame, the slides slidably connected to the corresponding fixed rods, and two sets of symmetrically distributed third springs sleeved on the fixed rods.
[0006] As a further preferred embodiment of this technical solution, two sets of symmetrically distributed torsion springs are sleeved on the mounting shaft, and the two ends of the two sets of torsion springs are respectively fixedly connected to the gear and the mounting bracket.
[0007] As a further preferred embodiment of this technical solution, two sets of symmetrically distributed adjusting blocks are slidably sleeved on the fixed rod, and the two ends of the two sets of third springs are respectively fixedly connected to the corresponding slide and adjusting blocks. The two sets of adjusting blocks are slidably connected to the mounting frame, and a bidirectional screw is rotatably installed inside the mounting frame.
[0008] As a further preferred embodiment of this technical solution, both ends of the bidirectional screw pass through the mounting frame and are rotatably connected to the mounting frame via rolling bearings. Both ends of the bidirectional screw pass through two sets of adjusting blocks and are threadedly connected to the two sets of adjusting blocks respectively.
[0009] As a further preferred embodiment of this technical solution, a receiving plate is provided between the mounting base and the base. Two sets of symmetrically distributed retaining rings are rotatably mounted on the receiving plate. A positioning block is fixedly installed in each set of retaining rings. A positioning groove is provided on the side wall of the airflow sensor. The retaining rings are movably engaged with the airflow sensor through the positioning block and the positioning groove. The two sets of retaining rings are fixedly connected by a connector.
[0010] As a further preferred embodiment of this technical solution, two sets of symmetrically distributed brackets are provided between the receiving plate and the mounting base. Both sets of brackets are rotatably connected to the receiving plate via a rotating shaft. A slider is rotatably installed at the lower end of each set of brackets. A damper is fixedly installed between the slider and the mounting base. A first spring is fitted on the damper. A sliding rod is fixedly installed inside the mounting base.
[0011] As a further preferred embodiment of this technical solution, the two sets of sliders are slidably sleeved with the slide rods, and two sets of symmetrically distributed second springs are sleeved on the slide rods, with the two ends of the second springs being fixedly connected to the sliders and the mounting bases, respectively.
[0012] This utility model provides an airflow sensor with a self-activation structure, which has the following beneficial effects:
[0013] (1) This utility model introduces a mechanical self-activation structure composed of a thin sheet and a micro switch. In the absence of airflow, the thin sheet is in the initial position, the micro switch remains open, and the core circuit of the sensor is completely de-energized, achieving true zero standby power consumption. The sensor circuit is only activated and powered on instantly when the airflow reaches a set threshold, pushing the sheet to move and triggering the microswitch. This completely eliminates the basic energy consumption in the absence of airflow or in standby mode. The self-activating structure responds to airflow mechanically and in real time, unlike periodic wake-ups which may miss the sampling window. It instantly captures and responds to sudden, transient airflow changes (such as pipe ruptures or sudden valve openings), ensuring real-time and reliable monitoring and avoiding the risk of missed detections. Through a rack and pinion transmission mechanism, in conjunction with a torsion spring, the sheet can automatically and stably reset to its initial center position after displacement, ensuring the consistency and reliability of the triggering action. Furthermore, through a bidirectional screw-adjusting block-third spring structure, users can precisely adjust the spring preload applied to the slide (and thus the sheet). By rotating the bidirectional screw, the initial compression of the third spring can be changed, thereby conveniently adjusting the airflow threshold (sensitivity) required to trigger the microswitch, adapting to the needs of different application scenarios.
[0014] (2) This utility model forms a highly efficient multi-stage vibration reduction system by combining a rotating support structure consisting of a bracket, slider, damper, and first spring with a sliding buffer structure consisting of a slide rod and second spring. This system can effectively absorb and attenuate high-frequency vibrations and impact loads from different directions (especially the vertical direction), significantly reducing the energy transmitted by mechanical vibration and impact to the core airflow sensor components (such as sensitive diaphragms and circuits), effectively preventing structural fatigue, performance drift, or physical damage caused by accumulated vibration stress, and greatly improving the long-term stability and service life of the sensor in harsh industrial vibration environments. The design of the retaining ring, positioning block, and positioning groove provides a simple and reliable quick-release structure, facilitating the rapid installation, disassembly, maintenance, and replacement of the airflow sensor. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0016] Figure 2 This is a schematic diagram showing the structural separation of the mounting base and the receiving plate of this utility model;
[0017] Figure 3 For the present utility model Figure 2 Enlarged view of the structure at point A;
[0018] Figure 4 This is a schematic diagram showing the separation of the airflow sensor and the mounting bracket of this utility model.
[0019] Figure 5 For the present utility model Figure 4 Enlarged view of the structure at point -B;
[0020] Figure 6 This is a schematic diagram of the structure of the carriage of this utility model;
[0021] In the diagram: 1. Airflow sensor; 2. Mounting base; 3. Positioning groove; 4. Snap ring; 5. Positioning block; 6. Bracket; 7. Slider; 8. Damper; 9. First spring; 10. Slide rod; 11. Second spring; 12. Thin sheet; 13. Fixing bracket; 14. Micro switch; 15. Mounting bracket; 16. Slide carriage; 17. Rack; 18. Gear; 19. Mounting shaft; 20. Torsion spring; 21. Fixing rod; 22. Third spring; 23. Adjusting block; 24. Bidirectional screw; 25. Support plate. Detailed Implementation
[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0023] This utility model provides a technical solution: such as Figures 1-6As shown, in this embodiment, the airflow sensor with a self-activating structure includes an airflow sensor 1. A mounting base 2 is provided below the airflow sensor 1, and a mounting frame 15 is fixedly mounted above the airflow sensor 1. A vertically placed thin plate 12 is provided inside the mounting frame 15. A micro switch 14 is fixedly mounted on the mounting frame 15. The thin plate 12 and the micro switch 14 are correspondingly arranged. Fixing brackets 13 are fixedly mounted on both sides of the thin plate 12. Two sets of slides 16 are slidably mounted on both sides of the mounting frame 15. The two sets of fixing brackets 13 are respectively fixedly connected to the corresponding inner slides 16. A rack 17 is fixedly mounted on each of the two sets of slides 16. A gear 18 is provided between the two sets of racks 17, and the gear 18 meshes with the two sets of racks 17 respectively. The racks 17 are connected to the mounting frame 15 via a mounting shaft 19. The two sets of slides 16 are centrally symmetrical about the axis of the mounting shaft 19. A fixed rod 21 corresponding to the slide 16 is fixedly installed inside the mounting frame 15. The slide 16 is slidably connected to the corresponding fixed rod 21. Two sets of symmetrically distributed third springs 22 are sleeved on the fixed rod 21. Two sets of symmetrically distributed torsion springs 20 are sleeved on the mounting shaft 19. The two ends of the two sets of torsion springs 20 are fixedly connected to the gear 18 and the mounting frame 15, respectively. Two sets of symmetrically distributed adjusting blocks 23 are slidably sleeved on the fixed rod 21. The two ends of the two sets of third springs 22 are fixedly connected to the corresponding slide 16 and the adjusting block 23, respectively. The two sets of adjusting blocks 23 are slidably connected to the mounting frame 15. A bidirectional screw 24 is rotatably installed inside the mounting frame 15. The two ends of the 4-axis rod pass through the mounting bracket 15 and are rotatably connected to the mounting bracket 15 via rolling bearings. The two ends of the bidirectional screw 24 pass through two sets of adjusting blocks 23 and are threadedly connected to the two sets of adjusting blocks 23 respectively. The micro switch 14 is fixedly installed on the inner wall of the mounting bracket 15 and aligned with the central axis of the thin plate 12. The two sides of the thin plate 12 are connected to the slide 16 via the fixing bracket 13. The slide 16 slides along the fixing rod 21 on the mounting bracket 15 to ensure the stability of the deflection trajectory of the thin plate 12. The rack 17-gear 18 mechanism is linked with the slide 16. The gear 18 provides the reset torque through the torsion spring 20 to ensure that the thin plate 12 quickly returns to its original position after being triggered. The thin plate 12 maintains its initial vertical position under the action of gravity and the preload of the third spring 22 and the torsion spring 20. The micro switch 14 is in the off state. In the ON state, the sensor core circuit is completely de-energized, with zero power consumption. When the airflow speed exceeds the threshold, the airflow pushes the thin plate 12 to deflect, causing it to touch the contact of the micro switch 14, instantly turning on the circuit. The sensor starts and begins to monitor airflow parameters such as flow rate and pressure in real time. After triggering, the gear 18-torsion spring 20 mechanism drives the thin plate 12 to automatically reset, ensuring the consistency of sensitivity for the next trigger. The position of the slide 16 is adjusted by the bidirectional screw 24, changing the compression of the third spring 22, thereby adjusting the wind force required for the thin plate 12 to trigger the micro switch 14, realizing the setting of different airflow threshold sensitivity, adapting to the needs of industrial pipelines, environmental monitoring and other scenarios. The leads of the micro switch 14 are connected to the sensor core circuit, such as the signal processing module and power supply module.When triggered, the micro switch 14 turns on the circuit, converting the airflow change into an electrical signal such as a voltage pulse. The signal is then converted by the built-in ADC and passed through I. 2 Data is transmitted via C or SPI interface to an external controller such as a PLC or microcontroller for processing.
[0024] like Figure 2 and Figure 3 As shown, a receiving plate 25 is provided between the mounting base 2 and the base. Two sets of symmetrically distributed retaining rings 4 are rotatably mounted on the receiving plate 25. A positioning block 5 is fixedly installed in each set of retaining rings 4. A positioning groove 3 is opened on the side wall of the airflow sensor 1. The retaining rings 4 are movably engaged with the airflow sensor 1 through the positioning block 5 and the positioning groove 3. The two sets of retaining rings 4 are fixedly connected by a connector. Two sets of symmetrically distributed brackets 6 are provided between the receiving plate 25 and the mounting base 2. Both sets of brackets 6 are rotatably connected to the receiving plate 25 through a rotating shaft. A slider 7 is rotatably mounted on the lower end of each set of brackets 6. A damper 8 is fixedly installed between the slider 7 and the mounting base 2. A first spring 9 is fitted on the damper 8. The mounting base 2 is fixedly... A slide rod 10 is installed, and two sets of sliders 7 are slidably sleeved with the slide rod 10. Two sets of symmetrically distributed second springs 11 are sleeved on the slide rod 10. The two ends of the second springs 11 are fixedly connected to the sliders 7 and the mounting base 2, respectively. The bracket 6 is connected to the receiving plate 25 through a rotating shaft. The sliders 7 buffer vertical vibration under the action of the damper 8 and the first spring 9. The second springs 11 on the slide rod 10 further absorb horizontal vibration energy, forming multi-level damping, reducing the stress damage of high-frequency vibration to the sensitive diaphragm. The retaining ring 4 is engaged with the positioning groove 3 on the side wall of the airflow sensor 1 through the positioning block 5. The connecting piece fixes the spacing of the retaining rings 4, realizing the rapid installation and maintenance of the sensor, which is suitable for complex working conditions in industrial sites.
[0025] This utility model provides an airflow sensor with a self-activating structure. Its specific working principle is as follows: A microswitch 14 is fixedly installed on the inner wall of a mounting bracket 15, aligned with the central axis of a thin sheet 12. Both sides of the thin sheet 12 are connected to a slide 16 via a fixed bracket 13. The slide 16 slides along a fixed rod 21 on the mounting bracket 15, ensuring a stable deflection trajectory for the thin sheet 12. A rack and pinion mechanism 17-gear 18 is linked to the slide 16. The gear 18 provides a reset torque via a torsion spring 20, ensuring that the thin sheet 12 quickly returns to its original position after triggering. Under the action of gravity and the preload of the third spring 22 and the torsion spring 20, the thin sheet 12 maintains its initial vertical position. The microswitch 14 is in the off state, and the sensor's core circuit is completely de-energized, with a power consumption of [missing value]. When the airflow velocity exceeds a threshold, the airflow pushes the thin plate 12 to deflect, causing it to touch the contact of the micro switch 14, instantly turning on the circuit. The sensor starts and begins real-time monitoring of airflow parameters such as flow velocity and pressure. After triggering, the gear 18-torsion spring 20 mechanism drives the thin plate 12 to automatically reset, ensuring consistent sensitivity for the next trigger. The position of the slide 16 is adjusted by the bidirectional screw 24, changing the compression of the third spring 22, thereby adjusting the wind force required for the thin plate 12 to trigger the micro switch 14, achieving different airflow threshold sensitivity settings to meet the needs of industrial pipelines, environmental monitoring, and other scenarios. The leads of the micro switch 14 are connected to the core circuit of the sensor, such as the signal processing module and power supply module. When triggered, the micro switch 14 turns on the circuit, converting the airflow change into an electrical signal such as a voltage pulse. After the signal is converted by the built-in ADC, it is transmitted through I... 2 Data is transmitted to an external controller such as a PLC or microcontroller via a C or SPI interface for processing. The bracket 6 is connected to the receiving plate 25 via a rotating shaft. The slider 7 buffers vertical vibration under the action of the damper 8 and the first spring 9. The second spring 11 on the slider 10 further absorbs horizontal vibration energy, forming multi-level damping to reduce stress damage to the sensitive diaphragm caused by high-frequency vibration. The retaining ring 4 is engaged with the positioning groove 3 on the side wall of the airflow sensor 1 via the positioning block 5. The connecting piece fixes the spacing of the retaining ring 4, enabling rapid installation and maintenance of the sensor, which is suitable for complex working conditions in industrial sites.
[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. Air flow sensor with self-activating structure, comprising an air flow sensor (1), characterized in that: A mounting base (2) is provided below the airflow sensor (1), and a mounting bracket (15) is fixedly installed above the airflow sensor (1). A vertically placed thin plate (12) is provided inside the mounting bracket (15), and a micro switch (14) is fixedly installed on the mounting bracket (15). The thin plate (12) is correspondingly arranged with the micro switch (14). Fixing brackets (13) are fixedly installed on both sides of the thin plate (12). Two sets of slides (16) are slidably installed on both sides of the mounting bracket (15). The two sets of fixing brackets (13) are respectively fixedly connected to the corresponding inner slides (16). Each set of racks (17) is fixedly installed on the racks (17), and a gear (18) is provided between the two sets of racks (17). The gear (18) meshes with the two sets of racks (17) respectively. The racks (17) are rotatably connected to the mounting frame (15) through the mounting shaft (19). The two sets of slides (16) are centrally symmetrically distributed about the axis of the mounting shaft (19). The mounting frame (15) is fixedly installed with a fixed rod (21) corresponding to the slide (16). The slide (16) is slidably connected to the corresponding fixed rod (21). Two sets of symmetrically distributed third springs (22) are sleeved on the fixed rod (21).
2. The airflow sensor with a self-activating structure according to claim 1, characterized in that: Two sets of symmetrically distributed torsion springs (20) are sleeved on the mounting shaft (19), and the two ends of the two sets of torsion springs (20) are fixedly connected to the gear (18) and the mounting bracket (15) respectively.
3. The airflow sensor with a self-activating structure according to claim 1, characterized in that: Two sets of symmetrically distributed adjusting blocks (23) are slidably sleeved on the fixed rod (21). The two ends of the two sets of third springs (22) are fixedly connected to the corresponding slide (16) and adjusting blocks (23) respectively. The two sets of adjusting blocks (23) are slidably connected to the mounting frame (15) respectively. A bidirectional screw (24) is rotatably installed inside the mounting frame (15).
4. The airflow sensor with a self-activating structure according to claim 3, characterized in that: The two ends of the bidirectional screw (24) pass through the mounting bracket (15) and are rotatably connected to the mounting bracket (15) through rolling bearings. The two ends of the bidirectional screw (24) pass through two sets of adjusting blocks (23) and are threadedly connected to the two sets of adjusting blocks (23) respectively.
5. The airflow sensor with a self-activating structure according to claim 1, characterized in that: A receiving plate (25) is provided between the mounting base (2) and the base. Two sets of symmetrically distributed retaining rings (4) are rotatably installed on the receiving plate (25). A positioning block (5) is fixedly installed in each of the two sets of retaining rings (4). A positioning groove (3) is provided on the side wall of the airflow sensor (1). The retaining rings (4) are movably engaged with the airflow sensor (1) through the positioning block (5) and the positioning groove (3). The two sets of retaining rings (4) are fixedly connected by a connector.
6. The airflow sensor with a self-activating structure according to claim 5, characterized in that: Two sets of symmetrically distributed brackets (6) are provided between the receiving plate (25) and the mounting base (2). Both sets of brackets (6) are rotatably connected to the receiving plate (25) through a rotating shaft. A slider (7) is rotatably installed at the lower end of both sets of brackets (6). A damper (8) is fixedly installed between the slider (7) and the mounting base (2). A first spring (9) is fitted on the damper (8). A sliding rod (10) is fixedly installed inside the mounting base (2).
7. The airflow sensor with a self-activating structure according to claim 6, characterized in that: The two sets of sliders (7) are slidably connected to the slide rod (10). Two sets of symmetrically distributed second springs (11) are sleeved on the slide rod (10). The two ends of the second springs (11) are fixedly connected to the slider (7) and the mounting base (2) respectively.