Torque Testing Device for Cooling Fan

Abstract

The present invention discloses a torque testing device for a cooling fan, which relates to the technical field of cooling fan testing. The torque testing device includes a bellows, a torque sensor, and a regulating valve. The bellows forms an air cavity, and the two opposite sides of the bellows are respectively an air inlet side and an air outlet side. The air inlet side and the air outlet side are respectively provided with an air inlet and an air outlet connected to the air cavity. The torque sensor is arranged on the air inlet side, and a mounting area is provided on the side of the torque sensor facing away from the bellows. The fan frame of the cooling fan can be mounted on the mounting area. The mounting area is provided with a first through hole corresponding to the air inlet, and the cooling fan can blow air toward the first through hole. The 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. The torque testing device of the present invention can adjust the air pressure by adjusting the valve, so that the cooling fan can have the required torque under different loads, ensuring the comprehensiveness and accuracy of the test results, and being more reliable.

Description

Technical Field

[0001] The present 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 testing method is to use a testing machine connected to the output end of the motor through a coupling, and use the motor torque to drive the test head on the testing machine to rotate together, thereby measuring the output torque and speed of the motor. However, when testing high-speed motors, this testing method will inevitably have high requirements for the dynamic balance of the motor and the testing 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] To achieve the above-mentioned object, the present invention proposes a torque testing device for a cooling fan, the torque testing device comprising:

[0005] A bellows, the bellows forming an air cavity, the two opposite sides of the bellows being an air inlet side and an air outlet side, 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;

[0006] a torque sensor, the torque sensor being disposed on the air inlet side, the torque sensor having a mounting area on a side facing away from the bellows, the fan frame of the cooling fan being mountable on the mounting area, the mounting area being provided with a first through hole corresponding to the air inlet, and the cooling fan being capable of blowing air toward the first through hole;

[0007] A regulating valve is provided at the air outlet on the air outlet side, and the regulating valve is used to adjust the air volume of the air outlet.

[0008] 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.

[0009] In one embodiment, a plurality of air outlets are provided on the air outlet side, and the air outlets have the same size, and the regulating valve is provided at each air outlet.

[0010] In one embodiment, a connecting plate is provided on the air inlet side, the torque sensor is connected to the side of the connecting plate facing away from the air box, and a second through hole communicating with the first through hole is provided at a position corresponding to the first through hole on the connecting plate.

[0011] In one embodiment, a connection area is provided on the air inlet side, 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 and limit the connecting plate in the connection area.

[0012] In one embodiment, the limiting mechanism includes a connecting seat and a wrench hinged to the connecting seat, the wrench is connected to the limiting arm, the connecting seat is connected to the position on the air inlet side close to the connection area, and the wrench can rotate relative to the connecting seat to drive the limiting arm to abut and limit the connecting plate in the connection area.

[0013] In one embodiment, the connecting seat includes a first hinge shaft and a second hinge shaft 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 and the free end are hinged;

[0014] The operating end can rotate and drive the free end to rotate around the first hinge shaft, so as to drive the limiting end to rotate around the second hinge shaft through the connecting end, so that the limiting end abuts against or separates from the connecting plate.

[0015] In one embodiment, a buffer head is provided on the side of the limiting end facing the connecting plate.

[0016] In one embodiment, the connecting plate is a rectangular plate, and a plurality of limiting mechanisms are provided. At least two limiting mechanisms are provided respectively close to the four sides of the connecting plate.

[0017] In one embodiment, a groove is provided on the air inlet side, and the groove forms the connection area. The connecting plate can be received in the groove, and the shape of the connecting plate matches that of the groove. In the torque testing device of the present invention, by using a bellows and a torque sensor, an air cavity is formed inside the bellows. The torque sensor is arranged at the air inlet position of the air flow direction, and the cooling fan can be installed on the torque sensor. During detection, the cooling fan operates, and blows air towards the air inlet through the first through hole on the torque sensor. At this time, the fan wheel of the cooling fan rotates, and the torque of the fan wheel during the operation of the cooling fan motor is transmitted to the fan frame through the electromagnetic field from the fan wheel. 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 during the operation of the cooling fan is obtained through the torque sensor. Moreover, the load of the cooling fan during operation can be simulated through the bellows, and the air volume of the air outlet can be adjusted by adjusting the valve, thereby adjusting the air pressure inside the air cavity. The cooling fan blows air towards the air cavity, making the air pressure in the air cavity 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; the smaller the air pressure in the air cavity, the smaller the load of the cooling fan. Therefore, by adjusting the air pressure through the valve, the load condition of the cooling fan can be changed, so as to measure the torque required by the cooling fan under different loads, ensuring the comprehensiveness and accuracy of the test results, and there is no need to use an additional testing machine and a coupling for testing, which is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the torque testing device provided by the present invention;

[0020] Figure 2 It is a schematic structural diagram of an embodiment of the cooling fan provided by the present invention;

[0021] Figure 3 It is a front view schematic diagram of an embodiment of the torque testing device provided by the present invention;

[0022] Figure 4 It is a side view schematic diagram of an embodiment of the torque testing device provided by the present invention;

[0023] Figure 5 It is a rear view schematic diagram of an embodiment of the torque testing device provided by the present invention;

[0024] Figure 6 is Figure 1 an enlarged view of A in

[0025] Explanation of the reference numerals in the attached drawings:

[0026] 100, torque testing device; 1, bellows; 11, air inlet side; 111, air inlet; 112, connection area; 12, air outlet side; 121, air outlet; 13, limiting mechanism; 131, connecting seat; 1311, first hinge shaft; 1312, second hinge shaft; 132, wrench; 1321, operating end; 1322, free end; 133, limiting arm; 1331, connecting end; 1332, limiting end; 134, buffer head; 2, torque sensor; 21, installation area; 3, regulating valve; 31, valve body; 32, valve pistol; 4, connecting plate; 41, second through hole; 42, first screw hole; 5, air pressure detector;

[0027] 200, cooling fan; 201, fan frame; 202, fan wheel; 203, air duct opening.

[0028] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the attached drawings. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0030] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] For the existing tests on cooling fans, generally, the output torque and rotational speed of the cooling fan motor are directly tested. The test method is to use a testing machine connected to the output end of the motor through a coupling, and the torque of the motor drives the test head on the testing machine to rotate together, so as to measure the output torque and rotational speed of the motor. However, such a test method has high requirements for the dynamic balance of the motor and the testing machine when testing high-speed motors, and is restricted by devices such as couplings, unable to meet the test requirements, and easily leading to inaccurate test results and poor reliability.

[0033] The present invention provides a torque testing device 100 for a cooling fan 200.

[0034] Please refer to Figures 1-6 , in an embodiment of the present invention, the cooling fan 200 includes a fan frame 201, a stator, and a fan wheel 202 disposed within the fan frame 201. The fan wheel 202 has a plurality of fan blades, and the fan wheel 202 rotates relative to the stator through an electromagnetic field to drive the fan blades to blow air.

[0035] The torque testing device 100 includes a wind box 1, a torque sensor 2, and an adjustment valve 3. The wind box 1 encloses an air cavity. The opposite sides of the wind box 1 are respectively an air inlet side 11 and an air outlet side 12. An air inlet 111 and an air outlet 121 communicating with the air cavity are respectively provided on the air inlet side 11 and the air outlet side 12; the torque sensor 2 is disposed on the air inlet side 11. A mounting area 21 is provided on the side of the torque sensor 2 facing away from the wind box 1. The fan frame 201 of the cooling fan 200 can be mounted on the mounting area 21. A first through hole (not shown in the figure) corresponding to the air inlet 111 is provided on the mounting area 21, and the cooling fan 200 can blow air toward the first through hole; the adjustment valve 3 is disposed at the air outlet 121 of the air outlet side 12, and the adjustment valve 3 is used to adjust the air volume of the air outlet 121.

[0036] The torque testing device 100 of the present invention forms an air cavity in the bellows 1 by using the bellows 1 and the torque sensor 2. The torque sensor 2 is arranged at the air inlet 111 position of the bellows 1. The cooling fan 200 can be installed on the torque sensor 2. During detection, the cooling fan 200 operates and blows air towards 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 hot fan motor operates, the torque of the fan wheel 202 is transmitted 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. The torque of the rotation of the fan wheel 202 during the operation of the cooling fan 200 is obtained through the torque sensor 2. Moreover, the load of the cooling fan during operation can be simulated by the bellows 1. The air volume discharged from the air outlet 121 can be adjusted by adjusting the valve 3, so as to adjust the air pressure in the air cavity. The cooling fan blows air towards the air cavity, making the air pressure in the air cavity 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. The smaller the air pressure in the air cavity, the smaller the load of the cooling fan. Therefore, by adjusting the air pressure through the valve 3, the load condition of the cooling fan 200 can be changed, so as to measure the torque required by the cooling fan 200 under different loads, ensuring the comprehensiveness and accuracy of the test results, and there is no need to use an additional testing machine and a coupling for testing, which is more reliable.

[0037] 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. Among them, the torque sensor 2 can adopt the static torque sensor 2 in the prior art.

[0038] Specifically, the air inlet 111 and the air outlet 121 are arranged on both sides of the bellows 1 in the horizontal direction. When the cooling fan 200 blows air, it blows air towards the horizontal direction.

[0039] Furthermore, the bellows is made of transparent acrylic.

[0040] In an embodiment, one side of the fan frame 201 has an air duct opening 203 for the cooling fan 200 to discharge air. 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.

[0041] It can be understood that the air flow generated when the fan wheel 202 rotates blows 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, so as to ensure that the air flow generated during the operation of the cooling fan 200 can all blow towards the air cavity, preventing air leakage and resulting in inaccurate test results of the torque sensor 2, and the reliability is better.

[0042] Specifically, the shape and size of the first through hole match those of the air inlet 111.

[0043] In one embodiment, a plurality of air outlets 121 are provided on the air outlet side 12, and the sizes of the air outlets 121 are the same. An adjustment valve 3 is provided at each air outlet 121.

[0044] It can be understood that the plurality of air outlets 121 and the corresponding adjustment valves 3 allow for more precise control of the air volume. By individually adjusting each valve, different complex air flow environments can be simulated, such as uneven air resistance distribution or air flow resistance in multiple different directions. Moreover, the air volume of each air outlet 121 can be individually adjusted, enabling a wider range of adjustment of the air pressure in the air cavity. Therefore, the testing of the cooling fan 200 can be made more comprehensive.

[0045] 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 air box 1. A second through hole 41 communicating with the first through hole is provided at the position of the connecting plate 4 corresponding to the first through hole.

[0046] 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, improving the installation efficiency. When testing different models of the cooling fan 200, different specifications of the torque sensor 2 can be quickly replaced by removing the connecting plate 4, saving time costs.

[0047] In one embodiment, a connection area 112 is provided on the air inlet side 11. A limiting mechanism 13 is provided at a position on the air inlet side 11 close to the connection area 112. The limiting mechanism 13 has a limiting arm 133, and the limiting arm 133 can abut and limit the connecting plate 4 in the connection area 112.

[0048] It can be understood that by providing the connection area 112, it is convenient to quickly install the connecting plate 4 in place. The limiting arm 133 of the limiting mechanism 13 abuts against the side of the connecting plate 4 facing away from the air box 1, which helps to fix the connecting plate 4 and prevent the connecting plate 4 from falling off the air box 1, improving the reliability during the detection of the cooling fan 200.

[0049] In one embodiment, the limiting mechanism 13 further includes a connection seat 131 and a wrench 132 hinged to the connection seat 131. The wrench 132 is connected to the limiting arm 133. The connection seat 131 is connected to the position on the air inlet side 11 close to the connection area 112. The wrench 132 can rotate relative to the connection seat 131 to drive the limiting arm 133 to abut and limit the connecting plate 4 in the connection area 112.

[0050] Understandably, 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. 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, greatly facilitating the operation.

[0051] Specifically, the connecting seat 131 can be connected to the bellows 1 by bolts.

[0052] In an embodiment, the connecting seat 131 includes a first hinge shaft 1311 and a second hinge shaft 1312 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 shaft 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 shaft 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 shaft 1311, so as to drive the limiting end 1332 to rotate around the second hinge shaft 1312 through the connecting end 1331, so that the limiting end 1332 abuts against or separates from the connecting plate 4.

[0053] Understandably, both the wrench 132 and the limiting arm 133 can rotate relative to the connecting seat. When operating the wrench, only need to turn the operating end 1321 to rotate around the first hinge shaft 1311, thereby driving the free end 1322 to rotate. The free end 1322 drives the connecting end 1331 to rotate around the second hinge shaft 1312, so as to drive the limiting end 1332 to rotate around the second hinge shaft 1312, so as to abut against the connecting plate 4 to limit the connecting plate 4 in the connection area 112, or separate the limiting end 1332 from the connecting plate 4 to facilitate the disassembly of the connecting plate 4; greatly facilitating the operation.

[0054] In an embodiment, a card slot is provided at the free end 1322, and a buckle is provided at the position of the connecting seat corresponding to the card slot. When the limiting end 1332 abuts against the connecting plate 4, the card slot is clamped to the corresponding buckle, thereby limiting the wrench 132 and the limiting arm 133 on the connecting seat 131, and further keeping the connecting plate 4 stable. When the connecting plate 4 needs to be disassembled, only need to slightly force the wrench 132 to separate the card slot from the buckle.

[0055] In an embodiment, a buffer head 134 is provided on the side of the limiting end 1332 facing the connecting plate 4. Understandably, by providing the buffer head 134, it can avoid the deformation of the connecting plate 4 or even the bellows 1 caused by the rigid abutment between the limiting end 1332 and the connecting plate 4, and has good reliability.

[0056] Specifically, the buffer head can be prepared from flexible materials such as silica gel, plastic, rubber, etc.

[0057] In one embodiment, the connecting plate 4 is a rectangular plate, and a plurality of limiting mechanisms 13 are provided. At least two limiting mechanisms 13 are provided near the four sides of the connecting plate 4 respectively.

[0058] It can be understood that there are a plurality of limiting mechanisms 13 on the bellows 1, and the four sides of the connecting plate 4 are all provided with limiting mechanisms 13, which can respectively abut against multiple positions of the connecting plate 4 to limit the connecting plate 4, ensuring the stability of the connecting plate 4. The plurality of 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.

[0059] In one embodiment, the air inlet side 11 is provided with a groove, and the groove forms a connection area 112. The connecting plate 4 is connected in the groove, and the shape of the connecting plate 4 matches that of the groove.

[0060] It can be understood that by providing the groove, it is convenient to quickly install and position the connecting plate 4, and it can ensure 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, and the risk of the connecting plate 4 falling off or loosening is further reduced.

[0061] 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, and a second screw hole (not shown in the figure) corresponding to the position of the first screw hole 42 is provided on the torque sensor 2. The bolt is threadedly connected to the first screw hole 42 and the second screw hole.

[0062] 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, avoiding inaccurate test results caused by the torque sensor 2 shaking during the test.

[0063] 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, and a valve plate connected to the valve pistol 32 through a valve rod is provided in the air outlet channel. The valve pistol 32 can rotate and drive the valve plate to rotate, so as to adjust the air volume of the air outlet channel.

[0064] Understandably, the design of the valve pistol 32 enables the operator to conveniently adjust the air output volume of the air outlet passage to meet the requirements of different test or application scenarios. By manually rotating the valve pistol 32 to drive the rotation of the valve plate, any air output volume setting between full closure and full opening of the air outlet passage can be achieved, providing great flexibility. Moreover, the valve body 31 is embedded in the air outlet 121, making the connection quicker and more convenient.

[0065] In one embodiment, a pressure detector 5 is further provided on the air box 1. The pressure detector 5 is used to detect the air pressure in the air cavity, so as to conveniently know the air pressure situation in the air cavity through the pressure detector 5 intuitively during the test of the cooling fan 200. The pressure detector 5 is on any side adjacent to the air inlet side 11.

[0066] In summary, when testing the cooling fan 200, it only needs to be installed on the torque sensor 2. After installation, run the cooling fan 200 to make the cooling fan 200 blow air into the air cavity. When the cooling fan 200 runs stably, read the value collected by the torque sensor 2. If it is necessary to test the torque required by the fan wheel 202 under different load conditions, adjust the air output volume by adjusting the valve 3, so as to test and obtain the torque required by the fan wheel 202 under different load conditions, and the test is more comprehensive and reliable.

[0067] The above description is only an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the technical concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A torque testing device for a cooling fan, characterized in that The torque testing device includes: A bellows that encloses an air chamber. The opposite sides of the bellows are an air inlet side and an air outlet side respectively. An air inlet and an air outlet communicating with the air chamber are respectively provided on the air inlet side and the air outlet side. A torque sensor is disposed on the air inlet side. There is an installation area on the side of the torque sensor facing away from the bellows. The fan frame of the cooling fan can be installed in the installation area. A first through hole corresponding to the air inlet is provided on the installation area. The cooling fan can blow air towards the first through hole. The torque sensor is used to test the torque of the fan wheel rotation of the cooling fan during operation. One side of the fan frame has an air duct opening for the cooling fan to discharge air. 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. A connecting plate is provided on the air inlet side. The torque sensor is connected to the side of the connecting plate facing away from the bellows. A second through hole communicating with the first through hole is provided at the position corresponding to the first through hole on the connecting plate. A regulating valve is disposed at the air outlet on the air outlet side. The regulating valve is used to regulate the air volume discharged from the air outlet.

2. The torque testing device for a cooling fan according to claim 1, characterized in that, A plurality of the air outlets are provided on the air outlet side, and the sizes of the air outlets are the same. The regulating valves are provided at each of the air outlets.

3. The torque testing device for the cooling fan according to claim 1, wherein A connection area is provided on the air inlet side. 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 that can abut and limit the connecting plate in the connection area.

4. The torque testing device for a cooling fan according to claim 3, characterized in that, The limiting mechanism includes a connection seat and a wrench hinged to the connection seat. The wrench is connected to the limiting arm. The connection seat is connected to the position on the air inlet side close to the connection area. The wrench can rotate relative to the connection seat to drive the limiting arm to abut and limit the connecting plate in the connection area.

5. The torque testing device for a cooling fan according to claim 4, wherein The connection seat includes a first hinge shaft and a second hinge shaft arranged at intervals. The two ends of the wrench are an operation end and a free end respectively. The position between the operation end and the free end is hinged to the first hinge shaft. The two ends of the limiting arm are a limiting end and a connection end respectively. The position between the limiting end and the connection end is hinged to the second hinge shaft. The connection end and the free end are hinged. The operation end can rotate and drive the free end to rotate around the first hinge shaft, so as to drive the limiting end to rotate around the second hinge shaft through the connection end, so that the limiting end abuts against or separates from the connecting plate.

6. The torque testing device for the cooling fan according to claim 5, wherein, A buffer head is provided on the side of the limiting end facing the connecting plate.

7. The torque testing device for the cooling fan according to claim 3, characterized in that The connecting plate is a rectangular plate. A plurality of the limiting mechanisms are provided. At least two of the limiting mechanisms are respectively provided close to the four sides of the connecting plate.

8. The torque testing device for the cooling fan according to claim 3, wherein A groove is provided on the air inlet side. The groove forms the connection area. The connecting plate can be received in the groove, and the shape of the connecting plate matches the shape of the groove.

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