Performance test equipment for small fan production

Abstract

The invention relates to the field of fan testing, in particular to performance testing equipment for small fan production. The existing fan performance test needs to use a plurality of devices, the detection process is complicated and the efficiency is low, and in the integrated detection device, all detection mechanisms may interfere with one another, so that data distortion and dust pollution are caused, the detection precision is influenced, the maintenance difficulty of the device is large, and the cost is high. The invention discloses performance testing equipment for small fan production. The performance testing equipment comprises a mounting plate, a protective shell and the like, and a protective shell is detachably mounted on the mounting plate. According to the invention, different testing mechanisms are arranged in a plurality of middle cylinders, and the middle cylinders are rotated and switched, so that automatic detection of multiple performances in a single device can be completed in sequence, the detection efficiency is improved, the detection cost is reduced, dust and heat dissipation conditions in an actual working environment of the small fan can be simulated, and the detection efficiency is improved. And dust on each test mechanism is treated, so that performance test data closer to actual use conditions are obtained.

Description

Technical Field

[0001] The present invention relates to the field of fan testing, and in particular to a performance testing device for producing small fans. Background Art

[0002] Fans are one of the commonly used heat dissipation devices, and their performance parameters are crucial to ensuring the normal operation of the equipment. Traditional fan performance testing needs to be carried out in multiple independent testing devices, which not only involves complicated testing procedures, but also consumes a lot of time and manpower, with low testing efficiency and high costs. However, when various testing devices are integrated and multiple data tests are performed on the fan in the same device, different testing mechanisms affect each other, resulting in a large difference between the test results and the actual results. In addition, if the actual working conditions of the fan are fully simulated and the fan is tested, dust and impurities in the air will also affect the testing mechanism, resulting in a decrease in detection accuracy. In particular, after several testing mechanisms are integrated, the dust and impurities deposited on the testing mechanism are difficult to remove, the maintenance difficulty of the equipment increases, and the maintenance cost also increases accordingly, affecting the normal production of the enterprise. Summary of the Invention

[0003] In order to overcome the shortcomings of existing fan performance testing, which requires the use of multiple devices, resulting in complicated testing procedures and low efficiency, and in integrated testing equipment, the various testing mechanisms may interfere with each other, causing data distortion, dust pollution affecting testing accuracy, and equipment maintenance being difficult and costly, the present invention provides a performance testing device for small fan production.

[0004] The technical implementation scheme of the present invention is as follows: a performance test device for small fan production, comprising a mounting plate and a protective shell; the protective shell is detachably mounted on the mounting plate; the device also comprises a front cylinder, a rear cylinder, a gantry, a transmission rod, a motor, a middle cylinder, a first electric actuator, a sealing ring and a dust removal unit; the mounting plate is fixedly connected to the front cylinder; a mounting frame is provided at the front of the front cylinder; the rear cylinder is fixedly connected to the side of the mounting plate away from the front cylinder; two gantry frames are mounted on the mounting plate; the two gantry frames are connected to the transmission rod for common rotation; the rear cylinder is mounted with a motor; the motor output shaft is fixedly connected to the transmission rod; the transmission rod is fixedly connected to four middle cylinder; the two ends of the middle cylinder are in contact with the front cylinder and the rear cylinder respectively; the diameters of the front cylinder and the rear cylinder are consistent with those of all the middle cylinders; two first electric actuators are installed on each of the front cylinder and the rear cylinder; a sealing ring is slidably connected to each of the front cylinder and the rear cylinder; each sealing ring is fixedly connected to the corresponding telescopic part of the first electric actuator; the two sealing rings cooperate with the middle cylinder, one sealing ring is used to block the gap between the front cylinder and the middle cylinder, and the other sealing ring is used to block the gap between the rear cylinder and the middle cylinder; the front cylinder is connected to a dust removal unit; the dust removal unit is used to remove dust from the detection components in each middle cylinder; the dust removal unit is connected to the sealing ring.

[0005] More preferably, the front tube and the rear tube have chamfers on their facing sides, and both ends of each middle tube have chamfers.

[0006] More preferably, the inner side of the sealing ring is made of rubber, and the width of the sealing ring is greater than the width of the gap between the front cylinder and the middle cylinder after chamfering, and the width of the sealing ring is greater than the width of the gap between the rear cylinder and the middle cylinder after chamfering.

[0007] More preferably, the dust removal unit includes a positioning column, a dust collecting barrel, a first bracket, an air pump, a first duct and a second duct; the sealing ring on the front barrel is fixedly connected to two positioning columns; the dust collecting barrel is plugged into the two positioning columns; the dust collecting barrel is coaxial with the highest middle barrel; the front barrel is fixedly connected to the first bracket; the first bracket is installed with an air pump; the front part of the dust collecting barrel is plugged into the air inlet of the air pump through a hose; the air outlet of the air pump is connected to the first duct; the first duct is fixedly connected to the first bracket; the transmission rod is a hollow tube; the first duct is rotatably connected to the transmission rod, and the first duct is connected to the transmission rod; the rear portal frame is fixedly connected to a connecting pipe; the connecting pipe is rotatably connected to the transmission rod; the rear part of the transmission rod is connected to the second duct through a connecting pipe; the lower part of the second duct is connected to the rear barrel.

[0008] More preferably, the dust collecting cylinder has an inner chamfer on the side facing the middle cylinder.

[0009] More preferably, the dust collecting device further comprises a filter element fixedly connected to the dust collecting barrel.

[0010] More preferably, the filter element is bowl-shaped.

[0011] More preferably, it also includes two electric guide rails installed on the protective shell; each electric guide rail is slidably connected to an electric slider; all the electric sliders are commonly fixed to the return air duct; one end of the return air duct is connected to the return air cover; the return air cover is used to cooperate with the rear cylinder; the other end of the return air duct is connected to the sealing cover; the sealing cover is used to cooperate with the front cylinder; the sealing cover is connected to the material guide pipe; the material guide pipe is used for dust transportation.

[0012] More preferably, it further includes two second electric actuators mounted on the sealing cover; all the telescopic parts of the second electric actuators are fixedly connected with a partition; the partition passes through the upper part of the sealing cover, and the partition is slidably connected to the sealing cover; the partition is used to seal the sealing cover.

[0013] More preferably, it further comprises a sleeve detachably connected to the front barrel.

[0014] The beneficial effects of the present invention are: 1. The present invention sets different test mechanisms in multiple middle cylinders and rotates and switches the middle cylinders to realize the automatic detection of multiple performances in sequence in a single device, which not only improves the detection efficiency and reduces the detection cost, but also can simulate the dust and heat dissipation conditions in the actual working environment of the small fan while processing the dust on each test mechanism, thereby obtaining performance test data that is closer to the actual usage conditions.

[0015] 2. By adding structures such as sleeves, sealing covers and return air ducts to the test system, the small fan body is continuously exposed to dust in a closed circulating airflow, simulating long-term dust accumulation conditions and comparing performance data to evaluate the impact of dust on its stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the performance testing equipment for small fan production of the present invention; Figure 2 A cross-sectional view of a performance testing device for a small fan production according to the present invention; Figure 3 This is a schematic diagram of the installation position of the middle tube of the present invention; Figure 4 This is a schematic diagram of the installation position of the testing instruments in each middle cylinder of the present invention; Figure 5 This is a schematic diagram of the installation position of the filter element of the present invention; Figure 6 This is a schematic plan view of the installation position of the return air duct of the present invention; Figure 7 This is a schematic diagram of the partition installation position of the present invention.

[0017] The markings of the components in the accompanying drawings are as follows: 111-small fan body, 1-mounting plate, 2-protective shell, 3-front cylinder, 4-rear cylinder, 5-gantry, 6-transmission rod, 7-motor, 8-middle cylinder, 9-first electric actuator, 10-sealing ring, 11-positioning column, 12-dust collecting cylinder, 13-first bracket, 14-air pump, 15-first duct, 16-second duct, 17-filter, 18-electric guide rail, 19-electric slider, 20-return air cover, 21-return air duct, 22-sealing cover, 23-material guide pipe, 24-second electric actuator, 25-partition, 301-mounting frame, 302-sleeve, 601-connecting pipe. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0019] The first embodiment: a performance test device for small fan production, according to Figure 1-Figure 5 As shown, it includes a mounting plate 1 and a protective shell 2; the protective shell 2 is detachably mounted on the mounting plate 1; It also includes a front cylinder 3, a rear cylinder 4, a gantry 5, a transmission rod 6, a motor 7, a middle cylinder 8, a first electric actuator 9, a sealing ring 10 and a dust removal unit; the front of the mounting plate 1 is fixedly connected to the front cylinder 3; the front of the front cylinder 3 is provided with a mounting frame 301; the rear of the mounting plate 1 is fixedly connected to the rear of the mounting plate 1; the mounting plate 1 is equipped with two gantry frames 5 distributed front and back; the two gantry frames 5 are connected to the transmission rod 6 for common rotation; the upper part of the rear cylinder 4 is equipped with a motor 7; the output shaft of the motor 7 is fixedly connected to the transmission rod 6; the transmission rod 6 is fixedly connected to four middle cylinders 8 distributed in a ring array; the two ends of the middle cylinder 8 are in contact with the front cylinder 3 and the rear cylinder 4 respectively; the diameters of the front cylinder 3, the rear cylinder 4 and all the middle cylinders 8 are consistent ; Anemometers, impeller anemometers, sound level meters and infrared thermometers are installed in the four middle cylinders 8 respectively; two first electric actuators 9 distributed front and back are installed on the front cylinder 3 and the rear cylinder 4 respectively; the first electric actuator 9 is an electric push rod; a sealing ring 10 is slidably connected to each of the front cylinder 3 and the rear cylinder 4; each sealing ring 10 is fixedly connected to the corresponding telescopic part of the first electric actuator 9; the two sealing rings 10 cooperate with the middle cylinder 8, one sealing ring 10 is used to seal the gap between the front cylinder 3 and the middle cylinder 8, and the other sealing ring 10 is used to seal the gap between the rear cylinder 4 and the middle cylinder 8; the front cylinder 3 is connected to a dust removal unit; the dust removal unit is connected to the sealing ring 10.

[0020] The front tube 3 and the rear tube 4 are chamfered on the facing sides, and both ends of each middle tube 8 are chamfered to prevent the middle tube 8 from getting stuck with the front tube 3 or the rear tube 4 during rotation.

[0021] The inner side of the sealing ring 10 is made of rubber, and the width of the sealing ring 10 is greater than the width of the gap between the front cylinder 3 and the middle cylinder 8 after chamfering, and the width of the sealing ring 10 is greater than the width of the gap between the rear cylinder 4 and the middle cylinder 8 after chamfering.

[0022] The dust removal unit includes a positioning column 11, a dust collecting barrel 12, a first bracket 13, an air pump 14, a first conduit 15 and a second conduit 16; the sealing ring 10 on the front cylinder 3 is fixedly connected to two positioning columns 11 distributed on the left and right; the dust collecting barrel 12 is plugged into the two positioning columns 11; the dust collecting barrel 12 is coaxial with the highest middle cylinder 8; the upper part of the front cylinder 3 is fixedly connected to the first bracket 13; the first bracket 13 is installed with the air pump 14; the front part of the dust collecting barrel 12 is plugged into the air inlet of the air pump 14 through a hose; the air outlet of the air pump 14 is connected to the first conduit 15; the lower part of the first conduit 15 is fixedly connected to the first bracket 13; the transmission rod 6 is a hollow tube; the lower part of the first conduit 15 is rotatably connected to the transmission rod 6, and the first conduit 15 is connected to the transmission rod 6; the rear portal frame 5 is fixedly connected to the connecting pipe 601; the connecting pipe 601 is rotatably connected to the transmission rod 6; the rear part of the transmission rod 6 is connected to the second conduit 16 through the connecting pipe 601; the lower part of the second conduit 16 is connected to the rear cylinder 4.

[0023] An inner chamfer is formed on the side of the dust collecting cylinder 12 facing the middle cylinder 8 to facilitate a close fit between the dust collecting cylinder 12 and the middle cylinder 8 .

[0024] The dust collecting cylinder 12 further includes a filter element 17 ; the filter element 17 is fixedly connected to the dust collecting cylinder 12 , and the filter element 17 is a filter screen.

[0025] The filter element 17 adopts a bowl-shaped design to increase its effective filtering area and enhance the filtering effect of the filter element 17.

[0026] The working steps of the above embodiment are: Before testing, the equipment needs to be firmly installed on a horizontal workbench. The operator then takes out the small fan body 111 to be tested and fastens the small fan body 111 into the mounting frame 301 at the front end of the front tube 3 for fixation. At this point, the preparation work has been completed and the test can begin at any time.

[0027] First, the small fan body 111 is tested for various functions under no-load conditions. All the first electric actuators 9 are controlled to extend, and the corresponding sealing rings 10 are driven to move synchronously. The two sealing rings 10 move toward each other until one sealing ring 10 blocks the gap between the front tube 3 and the middle tube 8 below, and the other sealing ring 10 blocks the gap between the rear tube 4 and the middle tube 8 below. All the first electric actuators 9 are controlled to be closed to prevent external air from interfering with the test results, which may cause the test results to deviate from the actual results. The anemometer is installed in the middle tube 8 at the bottom. After the power of the small fan body 111 is turned on to start working, the small fan body 111 blows air into the front tube 3, and the air flows along the front tube 3 to the middle tube 8 at the bottom. The anemometer in the middle tube 8 measures the air volume of the small fan body 111 when it is working and records the test results. Then the air flows out from the middle tube 8 at the bottom to the rear tube 4, and finally is discharged from the rear tube 4 to the outside air. After completing the air volume measurement, all the first electric actuators 9 are controlled to start contracting, so that the sealing ring 10 is reset. , then the motor 7 is controlled to start, and the output shaft of the motor 7 drives the transmission rod 6 and the corresponding parts thereon to rotate. From the front to the back, after the transmission rod 6 rotates 90° counterclockwise, the motor 7 is controlled to stop, so that the middle cylinder 8 originally located on the left rotates to the bottom, and then the sealing ring 10 is controlled to seal the gaps between the front cylinder 3, the rear cylinder 4 and the middle cylinder 8 respectively. At this time, the middle cylinder 8 contains a vane anemometer for measuring the wind speed when the small fan body 111 is working. Repeat the above operation, each time the transmission rod 6 rotates 90° to replace the position of the middle cylinder 8 at the bottom, so that the sound level meter and the infrared thermometer rotate to the bottom in turn, thereby obtaining the noise level and the heat generation of the small fan body 111 when working, and recording each data. After the test is completed, the motor 7 is controlled to stop. In summary, by setting different testing mechanisms in each middle cylinder 8 and rotating the middle cylinder 8, it is possible to realize the automatic detection of multiple performances in a single device, which significantly improves the detection efficiency and reduces time and labor costs.

[0028] The performance test of the small fan body 111 cannot be separated from the actual situation, so it is necessary to consider the actual use of the small fan body 111, and the test of its performance is of practical significance. The small fan body 111 is used when exposed to the air, so when the small fan body 111 is working, dust and impurities in the air will adhere to the small fan body 111, resulting in reduced wind force and air volume, poor operating efficiency, poor heat dissipation effect, increased noise and other problems. In addition, when testing the small fan body 111, it is also necessary to consider that the test mechanism in each middle tube 8 will also be affected by dust and impurities in the air, resulting in dust and impurities being deposited on the test mechanism, affecting the accuracy of the test results. According to the flow direction of air during the test, dust is deposited on the side facing the small fan body 111, so a dust collecting barrel 12 is added. After the dust collecting barrel 12 is plugged into the positioning column 11 through a connecting rod, it is also plugged into the air inlet of the air pump 14 through a hose and fixed. As the front sealing ring 10 moves, the front sealing ring 10 will move the front tube 3 and the gap between the middle tube 8 at the bottom is blocked, and at the same time, the dust collecting tube 12 blocks the front of the middle tube 8 at the top. The hose between the dust collecting tube 12 and the air pump 14 is deformed, and the air pump 14 is controlled to start. The air pump 14 draws air from the dust collecting tube 12 through the hose, and the dust collecting tube 12 draws air from the middle tube 8 at the top. Thus, the dust and impurities attached to the test mechanism in the middle tube 8 at the top are drawn away by the suction force of the dust collecting tube 12, wherein the filter 17 intercepts the dust and impurities, and the negative pressure generated by the air pump 14 removes the air. The air is drawn into the hollow transmission rod 6 through the first conduit 15, and then discharged to the rear tube 4 through the second conduit 16, and discharged to the external environment together with the air flowing through the rear tube 4. Therefore, when testing the performance of the small fan body 111, the dust removal operation is also performed on the test mechanism in the middle tube 8 at the same time, which effectively reduces the impact of dust on the test mechanism. During maintenance, the protective shell 2 is opened, and the dust collecting tube 12 and the air pump 14 are unfastened, the dust collecting tube 12 can be pulled out upwards, and the filter 17 can be removed for cleaning or replacement.

[0029] Second embodiment: Based on the first embodiment, Figure 1-Figure 7 As shown, it also includes an electric guide rail 18, an electric slider 19, a return air cover 20, a return air duct 21, a sealing cover 22 and a material guide pipe 23; the protective shell 2 is equipped with two electric guide rails 18 distributed front and back; each electric guide rail 18 is slidably connected to an electric slider 19; all the electric sliders 19 are commonly fixed to the return air duct 21; one end of the return air duct 21 is connected to the return air cover 20; the return air cover 20 is used to cooperate with the rear tube 4; the other end of the return air duct 21 is connected to the sealing cover 22; the sealing cover 22 is used to cooperate with the front tube 3; the sealing cover 22 is connected to the material guide pipe 23; the material guide pipe 23 is used for dust transportation.

[0030] It also includes a second electric actuator 24 and a partition 25; the sealing cover 22 is equipped with two second electric actuators 24 distributed on the left and right; the second electric actuator 24 is an electric push rod; all the telescopic parts of the second electric actuator 24 are fixedly connected with a partition 25; the partition 25 passes through the upper part of the sealing cover 22, and the partition 25 is slidably connected to the sealing cover 22; the partition 25 is used to seal the sealing cover 22.

[0031] It also includes a sleeve 302; the sleeve 302 is detachably connected to the front cylinder 3.

[0032] The working steps of the above embodiment are: On the basis of the first embodiment, it is mentioned that when the performance test of the small fan body 111 is carried out, the influence of dust and impurities on the test components in each middle tube 8 is considered. Therefore, it is also necessary to consider the influence of dust and impurities on the small fan body 111. The short-term exposure to the fine dust environment in the air in conventional tests is difficult to simulate the long-term dust accumulation condition. Therefore, in order to simulate the stability of the small fan body 111 during long-term use, it is necessary to add a dust simulation test. First, the small fan body 111 is taken out from the mounting frame 301, and then the sleeve 302 is inserted into the front tube 3 through the mounting frame 301, and then the small fan body 111 is re-installed on the mounting frame 301. The small fan body 111 cooperates with the front tube 3 to clamp the sleeve 302, and then the two electric sliders 19 are controlled to move downward, synchronously driving the return air duct 21 and the corresponding components thereon to move downward until the return air cover 20 completely covers the rear tube 4, and the sealing cover 22 completely covers the front tube 3. The installation frame 301 is then controlled to extend the two second electric actuators 24, synchronously driving the partition 25 to move upward, and then the external feeding device is connected to the guide pipe 23, and the external feeding device introduces the dust into the sealing cover 22 through the guide pipe 23. At this time, the small fan body 111 is controlled to be started, and the small fan body 111 blows the air in the direction of the front tube 3, the middle tube 8 and the rear tube 4, and then the air returns to the sealing cover 22 through the return air cover 20 and the return air pipe 21. The return airflow lifts the test dust in the sealing cover 22 and guides it to the small fan body 111, so that the dust acts on the small fan body 111, and then repeats the detection process in each middle tube 8 in the first embodiment to obtain the test data of the small fan body 111 at this time, and compares it with the test data in the first embodiment, thereby obtaining the influence of dust impurities on the performance of the small fan body 111 when the small fan body 111 works in a dusty environment for a long time.

[0033] The front tube 3 and the rear tube 4 are connected by the return air duct 21, so that the non-adherent dust moves with the air to realize the circulation of the dust. It also effectively avoids the dust being directly discharged into the outside air during the dust simulation test of the small fan body 111, causing environmental pollution and waste of dust. The influence of dust on the test components in each middle tube 8 is eliminated by the filter element 17 in the dust collecting tube 12.

[0034] After completing the dust simulation test on the small fan body 111, the two second electric actuators 24 are controlled to contract, so that the partition 25 moves downward and the sealing cover 22 is blocked to prevent the remaining dust in the sealing cover 22 from leaking into the small fan body 111 when the sealing cover 22 moves, thereby increasing the difficulty of subsequent cleaning of the small fan body 111. Then the two electric sliders 19 can be controlled to move upward, and the return air duct 21 and the corresponding components thereon can be reset synchronously. Then the operator can remove the small fan body 111 from the mounting frame 301, and remove the sleeve 302 in the front tube 3 through the mounting frame 301 for cleaning, so as to avoid residual dust and impurities in the front tube 3, which may affect the next normal test of the small fan body 111.

[0035] Although the present disclosure has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made to the present disclosure without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Therefore, the scope of the present disclosure should not be limited to the above-described embodiments, but should be determined not only by the appended claims but also by the equivalents of the appended claims.

Claims

1. A performance testing device for small fan production, comprising a mounting plate (1); a protective shell (2) is detachably mounted on the mounting plate (1); and the characteristics are: The invention also includes a front cylinder (3); a mounting plate (1) is fixedly connected to the front cylinder (3); a mounting frame (301) is provided at the front of the front cylinder (3); a rear cylinder (4) is fixedly connected to the side of the mounting plate (1) away from the front cylinder (3); two door-shaped frames (5) are installed on the mounting plate (1); the two door-shaped frames (5) are connected to a transmission rod (6) for common rotation; a motor (7) is installed on the rear cylinder (4); an output shaft of the motor (7) is fixedly connected to the transmission rod (6); the transmission rod (6) is fixedly connected to four middle cylinders (8); two ends of the middle cylinder (8) are in contact with the front cylinder (3) and the rear cylinder (4) respectively; the diameters of the front cylinder (3), the rear cylinder (4) and all the middle cylinders (8) are consistent; the front cylinder (3) Two first electric actuators (9) are respectively installed on the front cylinder (3) and the rear cylinder (4); a sealing ring (10) is slidably connected to each of the front cylinder (3) and the rear cylinder (4); each sealing ring (10) is fixedly connected to the telescopic portion of the corresponding first electric actuator (9); the two sealing rings (10) cooperate with the middle cylinder (8), one sealing ring (10) is used to seal the gap between the front cylinder (3) and the middle cylinder (8), and the other sealing ring (10) is used to seal the gap between the rear cylinder (4) and the middle cylinder (8); the front cylinder (3) is connected to a dust removal unit; the dust removal unit is used to remove dust from the detection components in each middle cylinder (8); the dust removal unit is connected to the sealing ring (10).

2. A performance testing device for small fan production according to claim 1, characterized in that: The front tube (3) and the rear tube (4) are both chamfered on the facing sides, and both ends of each middle tube (8) are chamfered.

3. A performance testing device for small fan production according to claim 2, characterized in that: The inner side of the sealing ring (10) is made of rubber, and the width of the sealing ring (10) is greater than the width of the gap between the front cylinder (3) and the middle cylinder (8) after chamfering, and the width of the sealing ring (10) is greater than the width of the gap between the rear cylinder (4) and the middle cylinder (8) after chamfering.

4. A performance testing device for small fan production according to claim 3, characterized in that: The dust removal unit includes a positioning column (11); the sealing ring (10) on the front cylinder (3) is fixedly connected to two positioning columns (11); the two positioning columns (11) are plugged with a dust collecting cylinder (12); the dust collecting cylinder (12) is coaxial with the highest middle cylinder (8); the front cylinder (3) is fixedly connected to a first bracket (13); the first bracket (13) is equipped with an air pump (14); the front of the dust collecting cylinder (12) is plugged with the air inlet of the air pump (14) through a hose; the air outlet of the air pump (14) is connected to the air inlet of the air pump (14). A first conduit (15) is connected to the first bracket (13); the transmission rod (6) is a hollow tube; the first conduit (15) is rotatably connected and connected to the transmission rod (6); a connecting tube (601) is fixed to the rear portal frame (5); the connecting tube (601) is rotatably connected to the transmission rod (6); the rear portion of the transmission rod (6) is connected to the second conduit (16) through the connecting tube (601); the lower portion of the second conduit (16) is connected to the rear cylinder (4).

5. A performance testing device for small fan production according to claim 4, characterized in that: The dust collecting cylinder (12) has an inner chamfer on one side facing the middle cylinder (8).

6. A performance testing device for small fan production according to claim 5, characterized in that: It also includes a filter element (17) fixedly connected to the dust collecting cylinder (12).

7. A performance testing device for small fan production according to claim 6, characterized in that: The filter element (17) is bowl-shaped.

8. A performance testing device for small fan production according to claim 7, characterized in that: The utility model further comprises two electric guide rails (18) mounted on the protective shell (2); each electric guide rail (18) is slidably connected to an electric slider (19); all the electric sliders (19) are fixedly connected to a return air duct (21); one end of the return air duct (21) is connected to a return air cover (20); the return air cover (20) is used to cooperate with the rear cylinder (4); the other end of the return air duct (21) is connected to a sealing cover (22); the sealing cover (22) is used to cooperate with the front cylinder (3); the sealing cover (22) is connected to a material guide pipe (23); the material guide pipe (23) is used for dust transportation.

9. A performance testing device for small fan production according to claim 8, characterized in that: The invention also includes two second electric actuators (24) mounted on the sealing cover (22); the telescopic parts of all the second electric actuators (24) are fixedly connected to a partition (25); the partition (25) passes through the upper part of the sealing cover (22), and the partition (25) is slidably connected to the sealing cover (22); the partition (25) is used to seal the sealing cover (22).

10. A performance testing device for small fan production according to any one of claims 1 to 9, characterized in that: It also includes a sleeve (302) detachably connected to the front cylinder (3).

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