Torque testing device of cooling fan

Abstract

The invention discloses a torque testing device of a cooling fan, and relates to the technical field of cooling fan test.The torque testing device comprises an air bellow, a torque sensor and an adjusting valve, an air cavity is defined by the air bellow, and the two opposite sides of the air bellow are the air inlet side and the air outlet side respectively; the air inlet side and the air outlet side are respectively provided with an air inlet and an air outlet which are communicated with the air cavity; the torque sensor is arranged on the air inlet side, the side, away from the air bellow, of the torque sensor is provided with an installation area, a fan frame of the cooling fan can be installed in the installation area, a first through hole corresponding to the air inlet is formed in the installation area, and the cooling fan can blow air towards the first through hole; the adjusting valve is arranged at the air outlet of the air outlet side and used for adjusting the air outlet amount of the air outlet. According to the torque testing device, the air pressure is adjusted through the adjusting valve, the required torque of the cooling fan under different loads can be obtained, the comprehensiveness and accuracy of a testing result are ensured, and the testing device is more reliable.

Description

Technical Field

[0001] The invention relates to the technical field of cooling fan testing, and in particular to a torque testing device for a cooling fan. Background Art

[0002] Existing tests for cooling fans generally directly test the output torque and speed of the cooling fan motor. The test method is to use a test machine connected to the output end of the motor through a coupling, and use the torque of the motor to drive the test head on the test machine to rotate together, so as to measure the output torque and speed of the motor. However, when testing high-speed motors, such a test method will inevitably have high requirements for the dynamic balance of the motor and the test machine, and will be limited by equipment such as couplings, and cannot meet the test requirements, which can easily lead to inaccurate test results and poor reliability. Summary of the invention

[0003] The main purpose of the present invention is to provide a torque testing device for a cooling fan, aiming to solve the technical problems of inaccurate test results and poor reliability of existing testing methods.

[0004] In order to achieve the above object, the present invention provides a torque testing device for a cooling fan, the torque testing device comprising: A bellows, the bellows enclosing an air cavity, the two opposite sides of the bellows being an air inlet side and an air outlet side, respectively, the air inlet side and the air outlet side being respectively provided with an air inlet and an air outlet communicating with the air cavity; A torque sensor, the torque sensor is arranged on the air inlet side, the torque sensor has a mounting area on a side away from the bellows, the fan frame of the cooling fan can be mounted on the mounting area, a first through hole corresponding to the air inlet is provided on the mounting area, and the cooling fan can blow air toward the first through hole; A regulating valve is arranged at the air outlet on the air outlet side, and the regulating valve is used to adjust the air volume of the air outlet.

[0005] In one embodiment, one side of the fan frame has an air duct opening for the heat dissipation fan to discharge air, and the size of the first through hole and the size of the air inlet are both larger than the size of the air duct opening.

[0006] In one embodiment, a plurality of the air outlets are provided on the air outlet side, and the sizes of the air outlets are consistent, and the regulating valve is provided at each air outlet.

[0007] In one embodiment, a connecting plate is provided on the air inlet side, the torque sensor is connected to a side of the connecting plate facing away from the bellows, and a second through hole communicating with the first through hole is provided on the connecting plate at a position corresponding to the first through hole.

[0008] In one embodiment, a connection area is provided on the air inlet side, and a limiting mechanism is provided on the air inlet side near the connection area. The limiting mechanism has a limiting arm, and the limiting arm can abut and limit the connection plate to the connection area.

[0009] In one embodiment, the limiting mechanism includes a connecting seat and a wrench hinged on the connecting seat, the wrench is connected to the limiting arm, the connecting seat is connected to a position on the air inlet side close to the connecting area, and the wrench can rotate relative to the connecting seat to drive the limiting arm to abut the connecting plate and limit it to the connecting area.

[0010] In one embodiment, the connecting seat includes a first hinge shaft and a second hinge shaft that are spaced apart, the two ends of the wrench are respectively an operating end and a free end, the position between the operating end and the free end is hinged to the first hinge shaft, the two ends of the limiting arm are respectively a limiting end and a connecting end, the position between the limiting end and the connecting end is hinged to the second hinge shaft, and the connecting end is hinged to the free end; The operating end can rotate and drive the free end to rotate around the first hinge axis, so as to drive the limiting end to rotate around the second hinge axis through the connecting end, so that the limiting end abuts against or separates from the connecting plate.

[0011] In one embodiment, a buffer head is provided on one side of the limiting end facing the connecting plate.

[0012] In one embodiment, the connecting plate is a rectangular plate, and a plurality of the limiting mechanisms are provided, and at least two of the limiting mechanisms are respectively provided near the four sides of the connecting plate. In one embodiment, a groove is provided on the air inlet side, and the groove forms the connection area. The connection plate can be received in the groove, and the shape of the connection plate matches that of the groove. The torque testing device of the present invention forms an air cavity in the bellows by adopting a bellows and a torque sensor. The torque sensor is arranged at the air inlet position of the wind direction. The cooling fan can be installed on the torque sensor. During detection, the cooling fan runs and blows air toward the air inlet through the first through hole on the torque sensor. At this time, the fan wheel of the cooling fan rotates. When the heat fan motor is running, the torque of the fan wheel is transmitted from the fan wheel to the fan frame through the electromagnetic field. The fan frame is connected to the torque sensor. Therefore, the torque is further transmitted to the torque sensor through the fan frame. The torque of the fan wheel rotation when the cooling fan is running is obtained through the torque sensor, and The bellows can simulate the load of the cooling fan during operation. The air volume at the air outlet can be adjusted by adjusting the valve, thereby adjusting the air pressure in the air cavity. The cooling fan blows air toward the air cavity, so that the air pressure in the air cavity is related to the load of the cooling fan. The greater the air pressure in the air cavity, the greater the load of the cooling fan, and the smaller the air pressure in the air cavity, the smaller the load of the cooling fan. Therefore, by adjusting the valve to adjust the air pressure, the load of the cooling fan can be changed, thereby measuring the torque required for the cooling fan under different loads, ensuring the comprehensiveness and accuracy of the test results, and no additional testing machine and coupling are required for testing, which is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0014] Figure 1 A schematic structural diagram of an embodiment of a torque testing device provided by the present invention; Figure 2 A schematic structural diagram of an embodiment of a heat dissipation fan provided by the present invention; Figure 3 A schematic front view of an embodiment of a torque testing device provided by the present invention; Figure 4 A schematic side view of an embodiment of a torque testing device provided by the present invention; Figure 5 A rear view schematic diagram of an embodiment of a torque testing device provided by the present invention; Figure 6 for Figure 1 A is an enlarged view of the middle image.

[0015] Description of Figure Numbers: 100. Torque test device; 1. Bellows; 11. Air inlet side; 111. Air inlet; 112. Connection area; 12. Air outlet side; 121. Air outlet; 13. Limiting mechanism; 131. Connection seat; 1311. First hinge axis; 1312. Second hinge axis; 132. Wrench; 1321. Operating end; 1322. Free end; 133. Limiting arm; 1331. Connection end; 1332. Limiting end; 134. Buffer head; 2. Torque sensor; 21. Installation area; 3. Regulating valve; 31. Valve body; 32. Valve pistol; 4. Connection plate; 41. Second through hole; 42. First screw hole; 5. Air pressure detector; 200, cooling fan; 201, fan frame; 202, fan wheel; 203, air duct opening.

[0016] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0019] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0020] Existing tests for cooling fans generally directly test the output torque and speed of the cooling fan motor. The test method is to use a test machine connected to the output end of the motor through a coupling, and use the torque of the motor to drive the test head on the test machine to rotate together, so as to measure the output torque and speed of the motor. However, when testing high-speed motors, such a test method will inevitably have high requirements for the dynamic balance of the motor and the test machine, and will be limited by equipment such as couplings, and cannot meet the test requirements, which can easily lead to inaccurate test results and poor reliability.

[0021] The present invention provides a torque testing device 100 for a heat dissipation fan 200 .

[0022] See also Figure 1-Figure 6 In one embodiment of the present invention, the cooling fan 200 includes a fan frame 201, a stator and a fan wheel 202 disposed in the fan frame 201. The fan wheel 202 has a plurality of fan blades. The fan wheel 202 rotates relative to the stator through an electromagnetic field to drive the fan blades to blow air.

[0023] The torque testing device 100 includes a bellows 1, a torque sensor 2 and a regulating valve 3. The bellows 1 forms an air cavity. The opposite sides of the bellows 1 are an air inlet side 11 and an air outlet side 12, respectively. The air inlet side 11 and the air outlet side 12 are respectively provided with an air inlet 111 and an air outlet 121 connected to the air cavity; the torque sensor 2 is arranged on the air inlet side 11, and the side of the torque sensor 2 facing away from the bellows 1 has an installation area 21, and the fan frame 201 of the cooling fan 200 can be installed in the installation area 21. The installation area 21 is provided with a first through hole (not shown) corresponding to the air inlet 111, and the cooling fan 200 can blow air toward the first through hole; the regulating valve 3 is arranged at the air outlet 121 of the air outlet side 12, and the regulating valve 3 is used to adjust the air output of the air outlet 121.

[0024] The torque testing device 100 of the present invention forms an air cavity in the bellows 1 by using a bellows 1 and a torque sensor 2. The torque sensor 2 is arranged at the air inlet 111 of the bellows 1. The cooling fan 200 can be installed on the torque sensor 2. During detection, the cooling fan 200 runs and blows air toward the air inlet 111 through the first through hole on the torque sensor 2. At this time, the fan wheel 202 of the cooling fan 200 rotates, while the fan frame 201 remains stationary. When the heat fan motor is running, the torque of the fan wheel 202 is transmitted from the fan wheel 202 to the fan frame 201 through the electromagnetic field. The fan frame 201 is connected to the torque sensor 2. Therefore, the torque is further transmitted to the torque sensor 2 through the fan frame 201, and the cooling air is obtained through the torque sensor 2. The torque of the fan wheel 202 rotating when the fan 200 is running, and the bellows 1 can simulate the load of the cooling fan when it is running, and the air volume of the air outlet 121 can be adjusted by adjusting the valve 3, thereby adjusting the air pressure in the air cavity, and the cooling fan blows toward the air cavity, so that the air pressure in the air cavity is related to the load of the cooling fan 200, the greater the air pressure in the air cavity, the greater the load of the cooling fan, and the smaller the air pressure in the air cavity, the smaller the load of the cooling fan. Therefore, by adjusting the air pressure by adjusting the valve 3, the load condition of the cooling fan 200 can be changed, thereby measuring the torque required for the cooling fan 200 under different loads, ensuring the comprehensiveness and accuracy of the test results, and no additional testing machine and coupling are required for testing, which is more reliable.

[0025] It should be noted that the load of the cooling fan 200 can be understood as wind resistance. The greater the air pressure in the air cavity, the greater the wind resistance when the cooling fan 200 blows air. The torque sensor 2 can adopt the static torque sensor 2 in the prior art.

[0026] Specifically, the air inlet 111 and the air outlet 121 are arranged on both sides of the wind box 1 in the horizontal direction, and the heat dissipation fan 200 blows air in the horizontal direction.

[0027] Furthermore, the bellows is made of transparent acrylic.

[0028] In one embodiment, one side of the fan frame 201 has an air duct opening 203 for the cooling fan 200 to discharge air, and the size of the first through hole and the size of the air inlet 111 are larger than the size of the air duct opening 203 .

[0029] It can be understood that the wind flow generated when the impeller 202 rotates is blown out from the air duct opening 203 of the fan frame 201, and the size of the first through hole and the size of the air inlet 111 are larger than the size of the air duct opening 203, thereby ensuring that the wind flow generated when the cooling fan 200 is running can be completely blown into the air cavity, preventing air leakage from causing inaccurate test results of the torque sensor 2, and improving reliability.

[0030] Specifically, the shapes and sizes of the first through hole and the air inlet 111 match each other.

[0031] In one embodiment, the air outlet side 12 is provided with a plurality of air outlets 121 , and the sizes of the air outlets 121 are the same, and a regulating valve 3 is disposed at each air outlet 121 .

[0032] It can be understood that multiple air outlets 121 and corresponding regulating valves 3 allow more precise control over the air output. By adjusting each valve individually, different complex airflow environments can be simulated, such as uneven wind resistance distribution or airflow resistance in multiple directions. Moreover, each air outlet 121 can adjust the air output individually, so that the adjustment range of the air pressure in the air cavity is wider, thereby making the test of the cooling fan 200 more comprehensive.

[0033] In one embodiment, a connecting plate 4 is provided on the air inlet side 11, the torque sensor 2 is connected to the side of the connecting plate 4 facing away from the bellows 1, and a second through hole 41 communicating with the first through hole is provided at a position corresponding to the first through hole on the connecting plate 4.

[0034] It can be understood that by using a detachable connecting plate 4, the installation process of the torque sensor 2 can be greatly simplified. During installation, the torque sensor 2 can be first installed on the connecting plate 4, and then the connecting plate 4 can be fixed to the air inlet side 11 of the air box 1, which improves the installation efficiency. When testing different models of cooling fans 200, different specifications of torque sensors 2 can be quickly replaced by removing the connecting plate 4, saving time and cost.

[0035] In one embodiment, a connection area 112 is provided on the air inlet side 11 , and a limiting mechanism 13 is provided near the connection area 112 on the air inlet side 11 . The limiting mechanism 13 has a limiting arm 133 , and the limiting arm 133 can abut and limit the connecting plate 4 to the connection area 112 .

[0036] It can be understood that by setting the connection area 112, it is convenient to quickly install the connecting plate 4, and the limiting arm 133 of the limiting mechanism 13 abuts against the side of the connecting plate 4 away from the bellows 1, which helps to fix the connecting plate 4 and prevent the connecting plate 4 from falling from the bellows 1, thereby improving the reliability of the cooling fan 200 during detection.

[0037] In one embodiment, the limiting mechanism 13 also includes a connecting seat 131 and a wrench 132 hinged on the connecting seat 131, and the wrench 132 is connected to the limiting arm 133; the connecting seat 131 is connected to a position of the air inlet side 11 close to the connecting area 112, and the wrench 132 can rotate relative to the connecting seat 131 to drive the limiting arm 133 to abut and limit the connecting plate 4 to the connecting area 112.

[0038] It can be understood that the connecting seat 131 is connected to the bellows 1, so that the entire limiting mechanism 13 is relatively firmly installed on the bellows 1, which can prevent the entire limiting mechanism 13 from falling off, wherein the wrench 132 is rotatably connected to the connecting seat 131, and can flexibly control the limiting arm 133 to abut against the connecting plate 4 to keep the connecting plate 4 stable or separate from the connecting plate 4 to facilitate the disassembly of the connecting plate 4, which greatly facilitates the operation.

[0039] Specifically, the connecting seat 131 can be connected to the bellows 1 by bolts. In one embodiment, the connecting seat 131 includes a first hinge axis 1311 and a second hinge axis 1312 which are arranged at intervals. The two ends of the wrench 132 are respectively an operating end 1321 and a free end 1322. The position between the operating end 1321 and the free end 1322 is hinged to the first hinge axis 1311. The two ends of the limiting arm 133 are respectively a limiting end 1332 and a connecting end 1331. The position between the limiting end 1332 and the connecting end 1331 is hinged to the second hinge axis 1312, and the connecting end 1331 is hinged to the free end 1322. The operating end 1321 can rotate and drive the free end 1322 to rotate around the first hinge axis 1311, so as to drive the limiting end 1332 to rotate around the second hinge axis 1312 through the connecting end 1331, so that the limiting end 1332 abuts against or separates from the connecting plate 4.

[0040] It can be understood that the wrench 132 and the limiting arm 133 can both rotate relative to the connecting seat. When operating the wrench, it is only necessary to pull the operating end 1321 to rotate around the first hinge axis 1311, thereby driving the free end 1322 to rotate, and the free end 1322 drives the connecting end 1331 to rotate around the second hinge axis 1312, so as to drive the limiting end 1332 to rotate around the second hinge axis 1312, thereby abutting against the connecting plate 4 to limit the connecting plate 4 to the connecting area 112, or to separate the limiting end 1332 from the connecting plate 4 to facilitate the disassembly of the connecting plate 4; the operation is greatly facilitated.

[0041] In one embodiment, a slot is provided at the free end 1322, and a buckle is provided at a position corresponding to the slot on the connecting seat. When the limiting end 1332 abuts against the connecting plate 4, the slot is engaged with the corresponding buckle, thereby limiting the limiting wrench 132 and the limiting arm 133 on the connecting seat 131 to further maintain the stability of the connecting plate 4. When the connecting plate 4 needs to be removed, the slot and the buckle can be separated by slightly turning the wrench 132.

[0042] In one embodiment, a buffer head 134 is provided on one side of the limit end 1332 facing the connecting plate 4. It can be understood that by providing the buffer head 134, deformation of the connecting plate 4 or even the bellows 1 caused by the rigid abutment between the limit end 1332 and the connecting plate 4 can be avoided, and reliability is good.

[0043] Specifically, the buffer head can be made of flexible materials such as silicone, plastic, rubber, etc.

[0044] In one embodiment, the connecting plate 4 is a rectangular plate, and a plurality of limiting mechanisms 13 are provided, and at least two limiting mechanisms 13 are respectively provided near the four sides of the connecting plate 4 .

[0045] It can be understood that the bellows 1 has multiple limiting mechanisms 13, and the four sides of the connecting plate 4 are provided with limiting mechanisms 13, which can respectively abut against multiple positions of the connecting plate 4 to limit the connecting plate 4 and ensure the stability of the connecting plate 4. The multiple limiting mechanisms 13 are evenly distributed around the connecting plate 4, which can effectively prevent the connecting plate 4 from vibrating and falling off during the test, and the reliability is higher.

[0046] In one embodiment, a groove is provided on the air inlet side 11 , and the groove forms a connection area 112 . The connection plate 4 is connected to the groove, and the shape of the connection plate 4 matches that of the groove.

[0047] It can be understood that by setting the groove, the connecting plate 4 can be installed and positioned quickly and conveniently, and it can be ensured that the connecting plate 4 is accurately embedded in the groove. Since the shape of the connecting plate 4 matches that of the groove, the position deviation caused by improper installation can be reduced, further reducing the risk of the connecting plate 4 falling off or loosening.

[0048] In one embodiment, the torque sensor 2 is connected to the connecting plate 4 by bolts. The connecting plate 4 is provided with a first screw hole. A second screw hole (not shown) is provided at a position corresponding to the first screw hole 42 on the torque sensor 2. The bolts are threadedly connected to the first screw hole 42 and the second screw hole.

[0049] It can be understood that the torque sensor 2 is also connected to the connecting plate 4 by bolts, which improves the accuracy of the position of the torque sensor 2 and further maintains the stability of the torque sensor 2 to avoid shaking of the torque sensor 2 during testing and cause inaccurate test results.

[0050] In one embodiment, the regulating valve 3 includes a valve body 31 and a valve pistol 32, the valve body 31 has an air outlet channel, the valve body 31 is connected to the air outlet 121, the air outlet channel is communicated with the air outlet 121, a valve plate connected to the valve pistol 32 through a valve stem is provided in the air outlet channel, the valve pistol 32 can rotate and drive the valve plate to rotate, thereby adjusting the air outlet volume of the air outlet channel.

[0051] It can be understood that the design of the valve pistol 32 allows the operator to easily adjust the air volume of the air outlet channel to meet the needs of different tests or application scenarios. By manually turning the valve pistol 32 to drive the valve plate to rotate, the air outlet channel can be set to any air volume from fully closed to fully open, providing great flexibility, and the valve body 31 is embedded in the air outlet 121, making the connection faster and more convenient.

[0052] In one embodiment, an air pressure detector 5 is also provided on the bellows 1, and the air pressure detector 5 is used to detect the air pressure in the air cavity, so that when the cooling fan 200 is tested, the air pressure condition in the air cavity can be intuitively known through the air pressure detector 5; wherein any side of the air pressure detector 5 adjacent to the air inlet side 11.

[0053] To summarize, when testing the cooling fan 200, you only need to install it on the torque sensor 2. After installation, run the cooling fan 200 to make the cooling fan 200 blow air toward the air cavity. When the cooling fan 200 runs stably, read the value collected by the torque sensor 2. If you want to test the torque required by the impeller 202 under different load conditions, adjust the air volume by adjusting the valve 3, so as to test and obtain the torque required by the impeller 202 under different load conditions, and the test is more comprehensive and reliable.

[0054] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A torque test device for a cooling fan, characterized in that: The torque testing device comprises: A bellows, the bellows enclosing an air cavity, the two opposite sides of the bellows being an air inlet side and an air outlet side, respectively, the air inlet side and the air outlet side being respectively provided with an air inlet and an air outlet communicating with the air cavity; A torque sensor, the torque sensor is arranged on the air inlet side, the torque sensor has a mounting area on a side away from the bellows, the fan frame of the cooling fan can be mounted on the mounting area, a first through hole corresponding to the air inlet is provided on the mounting area, and the cooling fan can blow air toward the first through hole; A regulating valve is arranged at the air outlet on the air outlet side, and the regulating valve is used to adjust the air volume of the air outlet.

2. The torque testing device for a cooling fan according to claim 1, characterized in that: One side of the fan frame is provided with an air duct opening for the heat dissipation fan to discharge air, and the size of the first through hole and the size of the air inlet are both larger than the size of the air duct opening.

3. The torque testing device for a cooling fan according to claim 1, characterized in that: The air outlet side is provided with a plurality of air outlets, and the sizes of the air outlets are consistent, and the regulating valve is arranged at each air outlet.

4. The torque testing device for a cooling fan according to claim 1, characterized in that: A connecting plate is provided on the air inlet side, the torque sensor is connected to a side of the connecting plate away from the bellows, and a second through hole communicating with the first through hole is provided at a position of the connecting plate corresponding to the first through hole.

5. The torque testing device for a cooling fan according to claim 4, characterized in that: A connection area is provided on the air inlet side, and a limiting mechanism is provided at a position on the air inlet side close to the connection area. The limiting mechanism has a limiting arm, and the limiting arm can abut the connection plate and limit it to the connection area.

6. The torque testing device for a cooling fan according to claim 5, characterized in that: The limiting mechanism includes a connecting seat and a wrench hinged on the connecting seat, the wrench is connected to the limiting arm, the connecting seat is connected to a position on the air inlet side close to the connecting area, and the wrench can rotate relative to the connecting seat to drive the limiting arm to abut the connecting plate and limit it to the connecting area.

7. The torque testing device for a cooling fan according to claim 6, characterized in that: The connecting seat comprises a first hinge shaft and a second hinge shaft which are arranged at intervals, the two ends of the wrench are respectively an operating end and a free end, the position between the operating end and the free end is hinged to the first hinge shaft, the two ends of the limiting arm are respectively a limiting end and a connecting end, the position between the limiting end and the connecting end is hinged to the second hinge shaft, and the connecting end is hinged to the free end; The operating end can rotate and drive the free end to rotate around the first hinge axis, so as to drive the limiting end to rotate around the second hinge axis through the connecting end, so that the limiting end abuts against or separates from the connecting plate.

8. The torque testing device for a cooling fan according to claim 7, characterized in that: A buffer head is arranged on one side of the limiting end facing the connecting plate.

9. The torque testing device for a cooling fan according to claim 5, characterized in that: The connecting plate is a rectangular plate, and a plurality of the limiting mechanisms are provided, and at least two of the limiting mechanisms are respectively provided near the four sides of the connecting plate.

10. The torque testing device for a cooling fan according to claim 5, characterized in that: The air inlet side is provided with a groove, the groove forms the connection area, the connection plate can be accommodated in the groove, and the shape of the connection plate matches that of the groove.

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