Air volume detection strain sensor embedded in cooling fan

Abstract

The utility model belongs to the technical field of air volume detection strain sensors, and particularly relates to an air volume detection strain sensor embedded with a heat dissipation fan, which comprises a heat dissipation fan, and the left side of the top of the heat dissipation fan is provided with an air pressure sensor strain elastomer. A strain gauge and a patch-shaped temperature sensor are installed on the left side and the right side of the top of the wind pressure sensor strain elastic body respectively, the strain gauge and the patch-shaped temperature sensor are combined on the wind pressure sensor strain elastic body, and dynamic adjustment of the running state of the fan is achieved through a closed-loop control system. The sensor reflects the air volume change in real time through the deformation of the strain elastomer, and can automatically adjust the rotating speed of the fan in combination with temperature detection, thereby not only avoiding the overheating of equipment caused by insufficient air volume, but also reducing the energy waste, remarkably improving the reliability and intelligent level of a heat dissipation system, and reducing the cost. And meanwhile, the sensor and the cooling fan are tightly mounted through the design of an embedded fixing structure.

Description

Technical Field

[0001] This utility model relates to the field of airflow detection strain sensor technology, specifically an airflow detection strain sensor embedded in a cooling fan. Background Technology

[0002] A cooling fan is a specialized fan that accelerates heat dissipation from equipment or systems through forced air circulation or convection. Its core function is to rapidly remove heat from the heat source via directional airflow, thereby reducing temperature. It is widely used in electronic equipment (such as computers, servers, and graphics cards), industrial machinery (such as motors and welding equipment), automobiles (engine compartments and battery packs), communication base stations, LED lighting, and home appliances (such as air conditioners and refrigerators). It effectively prevents performance degradation, malfunctions, or shortened lifespan due to overheating, ensuring stable operation within a safe temperature range.

[0003] In existing technologies, cooling fans, due to the lack of real-time airflow and temperature monitoring functions during long-term operation, struggle to detect problems such as abnormal fan speed, insufficient airflow, or overheating in a timely manner. Traditional fans typically rely on periodic manual maintenance or a single temperature protection device, failing to achieve dynamic monitoring of airflow changes. This results in the inability to provide timely warnings in the early stages of a fault, potentially leading to shutdown, overheating, or even fire risks. Existing fan start-stop control largely depends on fixed programs, unable to automatically adjust airflow according to the actual cooling needs of the equipment or changes in ambient temperature, resulting in energy waste and shortened service life. To address this, we propose an airflow detection strain sensor embedded in the cooling fan. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an airflow detection strain sensor embedded in a cooling fan. It combines a strain gauge with a patch-type temperature sensor within a wind pressure sensor strain elastic body, and uses a closed-loop control system to dynamically adjust the fan's operating status. Specifically, this sensor reflects changes in airflow in real time through the deformation of the strain elastic body, and combined with temperature detection, it can automatically adjust the fan speed, thus solving the problems mentioned earlier.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a strain sensor for airflow detection embedded in a cooling fan, comprising a cooling fan, a wind pressure sensor strain elastomer disposed on the top left side of the cooling fan, a strain gauge and a patch-shaped temperature sensor respectively mounted on the top left and right sides of the wind pressure sensor strain elastomer, an air intake surface fixedly connected to the bottom right side of the wind pressure sensor strain elastomer, a fixing plate fixedly connected to the left side of the wind pressure sensor strain elastomer, two sets of mounting holes being formed through the fixing plate, a slot being formed on the top left side of the cooling fan, two sets of threaded grooves being formed on the bottom side of the slot, the fixing plate being inserted into the slot, and a bolt being inserted through the mounting hole, the bottom end of the bolt being threaded into the threaded groove.

[0006] Preferably, the fixing plate is a rectangular plate structure, and the two sets of mounting holes are symmetrically distributed along the fixing plate.

[0007] Preferably, the bottom end of the air-collecting surface is flush with the air inlet plane of the cooling fan.

[0008] Preferably, the strain gauge and the patch-shaped temperature sensor are symmetrically arranged along the central axis of the strain elastomer of the wind pressure sensor.

[0009] Preferably, the bolt is a hexagonal head bolt.

[0010] Preferably, a sealing gasket is provided between the inner wall of the slot and the bottom side of the fixing plate.

[0011] This invention provides a strain sensor for detecting airflow embedded in a cooling fan. Compared with the prior art, it has the following advantages:

[0012] 1. This airflow detection strain sensor embedded in a cooling fan combines a strain gauge and a patch-shaped temperature sensor on the strain elastic body of a wind pressure sensor. It achieves dynamic adjustment of the fan's operating status through a closed-loop control system. Specifically, the sensor reflects changes in airflow in real time through the deformation of the strain elastic body. Combined with temperature detection, it can automatically adjust the fan speed, which avoids overheating of the equipment due to insufficient airflow, reduces energy waste, and significantly improves the reliability and intelligence level of the cooling system. At the same time, the embedded fixed structure design ensures a tight installation of the sensor and the cooling fan. Attached Figure Description

[0013] Figure 1 This is a front view structural diagram of the main body of this utility model;

[0014] Figure 2 This is a schematic diagram of the main body disassembled structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the bottom view of the main body structure of this utility model;

[0016] Figure 4 This utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0017] In the diagram: 1. Cooling fan; 2. Wind pressure sensor strain elastomer; 3. Patch-type temperature sensor; 4. Air intake surface; 5. Strain gauge; 6. Mounting plate; 7. Mounting hole; 8. Slot; 9. Threaded groove; 10. Bolt. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-4 This utility model provides a technical solution: a strain sensor for airflow detection embedded in a cooling fan, including a cooling fan 1, a wind pressure sensor strain elastomer 2 disposed on the top left side of the cooling fan 1, a strain gauge 5 and a patch-shaped temperature sensor 3 respectively mounted on the top left and right sides of the wind pressure sensor strain elastomer 2, an air intake surface 4 fixedly connected to the bottom right side of the wind pressure sensor strain elastomer 2, a fixing plate 6 fixedly connected to the left side of the wind pressure sensor strain elastomer 2, two sets of mounting holes 7 through the fixing plate 6, a slot 8 disposed on the top left side of the cooling fan 1, two sets of threaded grooves 9 disposed on the bottom side of the slot 8, the fixing plate 6 being inserted into the slot 8, and a bolt 10 passing through the mounting hole 7, the bottom end of the bolt 10 being threaded into the threaded groove 9.

[0020] When using this airflow detection strain sensor, a fixing plate 6 is fixedly connected to the left side of the air pressure sensor strain elastomer 2. The fixing plate 6 is inserted into the slot 8 on the top left side of the cooling fan 1, ensuring that the fixing plate 6 is aligned with the inner wall of the slot 8. The fixing plate 6 is then fastened to the fan housing using bolts 10 through the two sets of mounting holes 7 on the fixing plate 6 and the two sets of threaded grooves 9 on the bottom side of the slot 8 of the cooling fan 1. The bottom end of the bolt 10 is threaded into the threaded grooves 9, thus completing the fixing of the air pressure sensor strain elastomer 2. When the cooling fan 1 is running, the air intake surface 4 of the air pressure sensor strain elastomer 2 receives air. The airflow causes deformation, which is transmitted to the strain gauge 5 through the strain elastic body 2 of the wind pressure sensor. The strain gauge 5 converts the mechanical deformation of the strain elastic body 2 into an electrical signal, which is proportional to the fan speed, thus reflecting the airflow in real time. Simultaneously, a patch-type temperature sensor 3 is attached to the surface of the strain elastic body 2 of the wind pressure sensor, synchronously sensing changes in the temperature of the cooling air. When the temperature of the cooling fan 1 rises, the signal from the patch-type temperature sensor 3 triggers the control unit to adjust the fan speed to accelerate heat dissipation. When the temperature decreases or the airflow demand decreases, the system reduces the speed to save energy. If the temperature exceeds a preset threshold or the airflow is abnormal, such as the cooling fan 1 stopping, the system automatically triggers an alarm or cuts off the power supply to prevent overheating risks through the sensor signal from the strain elastic body 2 of the wind pressure sensor. Furthermore, the system automatically executes a self-test program when shutting down to verify the signal validity of the strain gauge 5 and the patch-type temperature sensor 3, ensuring that the sensors are always in normal working condition.

[0021] The fixing plate 6 is a rectangular plate structure with two sets of mounting holes 7 symmetrically distributed along it. The fixing plate 6 is precisely inserted into the slot 8 on the top left side of the cooling fan 1 through its rectangular plate structure. The two sets of symmetrically distributed mounting holes 7 ensure that the installation positions of the bolts 10 are symmetrical, making the fixing of the wind pressure sensor strain elastic body 2 on the fan housing more stable and avoiding uneven force on the wind pressure sensor strain elastic body 2 due to installation misalignment, thereby ensuring the stability and accuracy of airflow detection.

[0022] The bottom of the air intake surface 4 is flush with the air inlet plane of the cooling fan 1. This design ensures that the air intake surface 4 is fully exposed in the airflow path of the cooling fan 1, ensuring that the airflow acts evenly on the air intake surface 4. This allows the air intake surface 4 to directly and unobstructedly sense changes in airflow pressure, thereby accurately transmitting the mechanical deformation of the airflow to the strain gauge 5 and improving the sensitivity and reliability of airflow detection.

[0023] The strain gauge 5 and the patch-shaped temperature sensor 3 are symmetrically arranged along the central axis of the wind pressure sensor strain elastic body 2, so that the two are in symmetrical positions during the process of being subjected to force and deformation. This balances the stress distribution of the wind pressure sensor strain elastic body 2 caused by changes in wind pressure or temperature, reduces interference errors in the measurement signal, and ensures that the output signals of the strain gauge 5 and the patch-shaped temperature sensor 3 are linearly related to the actual air volume and temperature changes, thereby improving the detection accuracy.

[0024] Bolt 10 is a hexagonal head bolt, which is easy to tighten or loosen quickly with tools.

[0025] A sealing gasket is provided between the inner wall of slot 8 and the bottom side of fixing plate 6 to prevent dust or debris from entering the fan and to reduce vibration transmission.

[0026] Working principle: When using this air volume detection strain sensor, a fixing plate 6 is fixedly connected to the left side of the air pressure sensor strain elastomer 2. The fixing plate 6 is inserted into the slot 8 on the top left side of the cooling fan 1, ensuring that the fixing plate 6 is aligned with the inner wall of the slot 8. The fixing plate 6 is fastened to the fan housing with bolts 10 through the two sets of mounting holes 7 on the fixing plate 6 and the two sets of threaded grooves 9 on the bottom side of the slot 8 of the cooling fan 1. The bottom end of the bolt 10 is threadedly connected to the threaded groove 9, thus completing the fixing of the air pressure sensor strain elastomer 2. When the cooling fan 1 is running, the air receiving surface 4 of the air pressure sensor strain elastomer 2 is deformed by the airflow. This deformation is transmitted to the strain gauge 5 through the air pressure sensor strain elastomer 2. The strain gauge 5 converts the mechanical deformation of the air pressure sensor strain elastomer 2 into an electrical signal. This signal is proportional to the fan speed, thus reflecting the air volume in real time.

[0027] Simultaneously, the patch-shaped temperature sensor 3 is attached to the surface of the strain gauge 2 of the wind pressure sensor, synchronously sensing the temperature change of the cooling air. When the temperature of the cooling fan 1 rises, the signal from the patch-shaped temperature sensor 3 triggers the control unit to adjust the fan speed to accelerate heat dissipation. When the temperature drops or the airflow demand decreases, the system reduces the speed to save energy. If the temperature exceeds a preset threshold or the airflow is abnormal, such as the cooling fan 1 stopping, the system automatically triggers an alarm or cuts off the power supply through the sensor signal from the strain gauge 2 of the wind pressure sensor to prevent overheating risks. In addition, the system automatically executes a self-test program when shutting down to verify the signal validity of the strain gauge 5 and the patch-shaped temperature sensor 3, ensuring that the sensors are always in normal working condition.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] 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. A strain sensor for detecting the air volume of a cooling fan embedded in the cooling fan, comprising a cooling fan (1), characterized in that: The top left side of the heat dissipation fan (1) is provided with a wind pressure sensor strain elastomer (2), the top left and right sides of the wind pressure sensor strain elastomer (2) are respectively provided with a strain gauge (5) and a patch-shaped temperature sensor (3), the right bottom side of the wind pressure sensor strain elastomer (2) is fixedly connected with a wind collecting surface (4), the left side of the wind pressure sensor strain elastomer (2) is fixedly connected with a fixed plate (6), two groups of mounting holes (7) are through-set on the fixed plate (6), the top left side of the heat dissipation fan (1) is provided with a slot (8), the bottom side of the slot (8) is provided with two groups of threaded grooves (9), the fixed plate (6) is inserted on the slot (8), bolts (10) are through-set on the mounting holes (7), and the bottom ends of the bolts (10) are threadedly inserted on the threaded grooves (9).

2. The strain sensor for detecting air volume of an embedded heat-dissipation fan according to claim 1, wherein: The fixed plate (6) is a rectangular plate structure, and the two groups of mounting holes (7) are symmetrically distributed along the fixed plate (6).

3. The strain sensor of claim 1, wherein: The bottom end of the wind collecting surface (4) is flush with the air inlet plane of the heat dissipation fan (1).

4. The strain sensor of claim 1, wherein: The strain gauge (5) and the patch-shaped temperature sensor (3) are symmetrically arranged along the central axis of the wind pressure sensor strain elastomer (2).

5. The strain sensor of claim 1, wherein: The bolt (10) is a hexagonal head bolt.

6. The strain sensor of claim 1, wherein: A sealing gasket is arranged between the inner wall of the slot (8) and the bottom side of the fixed plate (6).

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