Centrifugal fan performance determination experiment device

Abstract

The utility model discloses a centrifugal fan performance determination experimental device, and relates to the technical field of fan testing. According to the technical scheme, an air pipe is installed on the main frame body, a horizontal installation frame is arranged above the side, close to an air outlet of the air pipe, of the main frame body, a centrifugal fan is installed at the end, close to the air pipe, of the upper portion of the installation frame, and a flange connector on the centrifugal fan is detachably connected with the air outlet of the air pipe; a motor is fixedly installed at the end, away from the air pipe, of the upper portion of the installation frame, and the output end of the motor is detachably connected with an impeller shaft of the centrifugal fan. A lifting mechanism is arranged below the mounting frame and can adjust the height of the mounting frame in the vertical direction. The height of the mounting rack for mounting the centrifugal fan can be freely adjusted through the lifting mechanism, so that workers can take and place the centrifugal fan more conveniently in a labor-saving manner.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fan testing, in particular to a centrifugal fan performance determination experiment device. BACKGROUND

[0002] As a commonly used wind-driven machinery, centrifugal fan is widely used in industrial, civil, agricultural and other fields. The working performance of centrifugal fan directly affects its application effect, so it is necessary to test and study its working performance. The centrifugal fan performance determination experiment device is a commonly used device in the test and study of centrifugal fan. The device can determine the data such as air volume, air pressure and efficiency of centrifugal fan. During the test, the worker needs to first lift the centrifugal fan to be tested to the frame, then connect the rotating shaft of the centrifugal fan with the output end of the motor, and connect the air inlet of the centrifugal fan with the joint of the test air pipe through flange. When the experiment device runs under certain working conditions (using a flow collector to adjust the flow), air flows through the air pipe into the fan and is extracted from the fan outlet by the impeller. The inlet dynamic pressure is measured on the flow collector, the fan static pressure is measured at the fan inlet measuring hole, and the power value on the control box is read at the same time. Through the measured experimental data and the known original parameters of the experiment table, other required fan parameters under the working condition can also be calculated through the relationship between them.

[0003] However, for some enterprises, such as power plant enterprises in the energy and power engineering industry (mainly researching the development and utilization of energy, the design and testing technology of power machinery and thermal equipment, etc., energy including traditional energy such as coal, oil and natural gas, and new energy such as nuclear energy, wind energy and bioenergy, power machinery and thermal equipment including internal combustion engine, boiler, aircraft engine, refrigerator, centrifugal fan, etc.), the number of centrifugal fans that need to be tested is usually more than one, and the specifications and weights of the centrifugal fans used in the enterprise are usually large. If the worker frequently installs and removes the centrifugal fan on the experiment table with a certain height, it is not only inconvenient to take and place, but also increases the labor intensity of the worker. Practical new type content

[0004] The present application provides a centrifugal fan performance determination experiment device, which can reduce the labor intensity of workers when measuring the performance of centrifugal fan and facilitate workers to take and place the centrifugal fan.

[0005] The above-mentioned object of the present application is realized by the following technical scheme:

[0006] A centrifugal fan performance measurement experimental device, including a main frame, a wind pipe is installed on the main frame, a pressure sensor is installed on the wind pipe, the pressure sensor is electrically connected with the control module installed on the main frame, a horizontal mounting bracket is arranged on the upper side of the main frame close to the air outlet of the wind pipe, a centrifugal fan is installed on the upper side of the mounting bracket close to one end of the wind pipe, a flange joint is fixedly arranged at the air inlet of the centrifugal fan, and the flange joint on the centrifugal fan is detachably connected with the air outlet of the wind pipe through bolts and nuts;

[0007] A motor is fixedly installed on the upper side of the mounting bracket away from one end of the wind pipe, and the output end of the motor is detachably connected with the impeller shaft of the centrifugal fan.

[0008] A lifting mechanism is arranged below the mounting bracket, and the lifting mechanism can adjust the height of the mounting bracket in the vertical direction.

[0009] Further, the lifting mechanism includes two groups of traction units, and the two groups of traction units are arranged on the two sides of the mounting bracket along the width direction of the main frame, the upper end of the traction unit is connected with the mounting bracket, the lower end of the traction unit is connected with a power unit, and the power unit can control the height of the mounting bracket in the vertical direction through the two groups of traction units.

[0010] Further, the traction unit includes a first connecting rod and a second connecting rod, the lengths of the first connecting rod and the second connecting rod are equal and the first connecting rod and the second connecting rod are arranged in parallel on the corresponding side of the mounting bracket, the upper end of the first connecting rod and the upper end of the second connecting rod are rotatably connected with the mounting bracket, and the upper end of the first connecting rod is located obliquely above the upper end of the second connecting rod close to the main frame on one side.

[0011] The lower ends of the two first connecting rods in the two traction units are connected through a first supporting pivot, and the lower ends of the two second connecting rods are connected through a second supporting pivot; a supporting seat is arranged below the mounting bracket, the first supporting pivot and the second supporting pivot are horizontally penetrated through the supporting seat along the width direction of the main frame, and the first supporting pivot and the second supporting pivot are rotatably connected with the supporting seat, the first supporting pivot is connected with a power unit, and the power unit can drive the first supporting pivot to rotate around the axis of the first supporting pivot.

[0012] Further, the supporting seat is installed on the lower end of the main frame close to the mounting bracket.

[0013] Further, the power unit comprises an adjusting hydraulic cylinder and a rotating rod, one end of the rotating rod is sleeved in the middle position of the first supporting rotating shaft and is fixedly connected therebetween, the other end of the rotating rod is hingedly connected with the output end of the adjusting hydraulic cylinder, the other end of the adjusting hydraulic cylinder is hingedly connected with a fixing plate, and the fixing plate is fixedly installed on the main frame body.

[0014] Further, the rotating rod is in an arc shape, and the opening side thereof faces away from the mounting rack.

[0015] Further, a bearing is arranged between the electric motor and the centrifugal fan, the bearing is fixedly installed on the mounting rack, a sleeve is installed at the center position of the bearing, one end of the sleeve is fixedly connected with the output end of the electric motor, and the other end of the sleeve is sleeved on the impeller shaft of the centrifugal fan and is fixedly connected therebetween through bolts.

[0016] Further, the bottom of the mounting rack is provided with a rubber buffer gasket.

[0017] In summary, the present application has at least one of the following beneficial technical effects:

[0018] The mounting rack provided with the centrifugal fan and the electric motor is arranged separately from the main frame body provided with the air pipe, and the lifting mechanism capable of adjusting the height thereof is arranged below the mounting rack, so that when the centrifugal fan needs to be detected, the mounting rack can be lowered by the lifting mechanism to reduce the height thereof in the vertical direction, so that the worker can move the centrifugal fan to be detected to the mounting rack and connect the same with the electric motor, after the centrifugal fan to be detected is installed, the mounting rack can be lifted by the lifting mechanism until the flange joint on the air inlet of the centrifugal fan to be detected is opposite to the air outlet of the air pipe, and then the worker can connect them together by bolts and nuts to start the test work. When other centrifugal fan needs to be replaced after the test is completed, the bolts and nuts between the flange joint on the air inlet of the centrifugal fan and the air outlet of the air pipe are disassembled, the mounting rack is lowered by the lifting mechanism, the worker removes the detected centrifugal fan and re-installs the new centrifugal fan to be detected, and the above steps are repeated. Compared with the prior art, the height of the mounting rack for installing the centrifugal fan can be freely adjusted by the lifting mechanism, so that the worker can take and place the centrifugal fan more conveniently and labor-saving. Workers of different heights can adjust the height of the mounting rack according to their own height when taking and placing the centrifugal fan, thereby effectively improving the flexibility of the present application in use. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is the overall structure schematic diagram of the centrifugal fan when testing;

[0021] Figure 2 is the overall structure schematic diagram of the mounting rack when placed on the ground;

[0022] Figure 3 is the three-dimensional structure schematic diagram after removing one of the side plates on the support seat of the present application;

[0023] Figure 4 is the bottom view of the present application.

[0024] The drawings are as follows: 1, main frame body; 2, air pipe; 3, pressure measuring sensor; 4, control module; 5, mounting rack; 6, centrifugal fan; 7, motor; 8, lifting mechanism; 81, traction unit; 811, first connecting rod; 812, second connecting rod; 82, power unit; 821, adjusting hydraulic cylinder; 822, rotating rod; 823, fixed plate; 9, first support shaft; 10, second support shaft; 11, support seat; 12, bearing; 13, sleeve; 14, rubber buffer gasket. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor also belong to the scope of protection of the present application.

[0026] As shown in Figure 1 and Figure 2 , a centrifugal fan performance measurement experimental device disclosed by the present application includes a main frame body 1, an air pipe 2 is installed on the main frame body 1, a pressure measuring sensor 3 is installed on the air pipe 2, the pressure measuring sensor 3 is electrically connected with a control module 4 installed on the main frame body 1, a horizontal mounting rack 5 is arranged on the upper side of the main frame body 1 close to the air outlet of the air pipe 2, a centrifugal fan 6 is installed on the upper side of the mounting rack 5 close to one end of the air pipe 2, a flange joint is fixedly arranged at the air inlet of the centrifugal fan 6, and the flange joint on the centrifugal fan 6 and the air outlet of the air pipe 2 are detachably connected together through bolts and nuts.

[0027] The electric motor 7 is fixedly installed above the mounting rack 5 and away from one end of the air pipe 2, and the output end of the electric motor 7 is detachably connected with the impeller shaft of the centrifugal fan 6;

[0028] The lifting mechanism 8 is arranged below the mounting rack 5 and can adjust the height of the mounting rack 5 in the vertical direction.

[0029] In the above embodiment, the mounting rack 5 for mounting the centrifugal fan 6, the electric motor 7 and the like is arranged separately from the main rack body 1 on which the air pipe 2 is arranged, and the lifting mechanism 8 for adjusting the height of the mounting rack 5 is arranged below the mounting rack 5. When the centrifugal fan 6 needs to be detected, the mounting rack 5 can be first lowered by the lifting mechanism 8, so that the height of the mounting rack 5 in the vertical direction is reduced, and then the worker can carry the centrifugal fan 6 to be detected to the mounting rack 5 and connect the centrifugal fan 6 with the electric motor 7. After the centrifugal fan to be detected is installed, the mounting rack 5 can be raised by the lifting mechanism 8 until the flange joint on the air inlet of the centrifugal fan 6 to be detected is opposite to the air outlet of the air pipe 2, and then the worker can connect the flange joint with the air outlet by bolts and nuts, and the test work can be started. When the other centrifugal fan 6 needs to be replaced after the test is completed, the bolts and nuts between the flange joint on the air inlet of the centrifugal fan 6 and the air outlet of the air pipe 2 are first disassembled, the mounting rack 5 is lowered by the lifting mechanism 8, and then the worker can disassemble the centrifugal fan 6 that has been detected and re-install the new centrifugal fan 6 to be detected, and the above steps can be repeated.

[0030] Compared with the prior art in which the centrifugal fan 6, the electric motor 7 and the air pipe 2 are installed on an integrated rack, if the worker wants to place the centrifugal fan 6, the worker needs to first lift the centrifugal fan 6 to be detected to the height of the upper end of the rack, and then the worker can start the installation work of the centrifugal fan 6. If the worker wants to take down the centrifugal fan 6 after the test is completed, the worker also needs to slowly take down the centrifugal fan 6 from the upper end of the rack body which has a certain height. For a production enterprise, the specifications and weights of the fans used are often large, which will cause the worker to be inconvenient and laborious when the worker takes and places the centrifugal fan 6. In the present application, the height of the mounting rack 5 for mounting the centrifugal fan 6 can be freely adjusted by the lifting mechanism 8, so that the worker can be more convenient and labor-saving when the worker takes and places the centrifugal fan 6. Workers of different heights can adjust the height of the mounting rack 5 according to their own heights when they take and place the centrifugal fan 6, which effectively improves the flexibility of the present application when it is used.

[0031] Further, as shown in Figure 3 the lifting mechanism 8 includes two groups of traction units 81, the two groups of traction units 81 are respectively arranged on the two sides of the mounting rack 5 along the width direction of the main rack body 1, the upper end of the traction unit 81 is connected with the mounting rack 5, the lower end of the traction unit 81 is connected with the power unit 82, and the power unit 82 can control the height of the mounting rack 5 in the vertical direction through the two groups of traction units 81.

[0032] The traction units 81 symmetrically arranged on opposite sides of the mounting rack 5 can make the mounting rack 5 and the power unit 82 have a stable connection relationship, and the force generated by the power unit 82 can be smoothly transmitted to the mounting rack 5 when the power unit 82 is working, so as to change the height of the mounting rack 5 in the vertical direction.

[0033] Further, as shown in Figures 1-3 The traction unit 81 includes a first connecting rod 811 and a second connecting rod 812, the lengths of the first connecting rod 811 and the second connecting rod 812 are equal and they are arranged in parallel on the corresponding sides of the mounting rack 5, the upper ends of the first connecting rod 811 and the second connecting rod 812 are rotationally connected with the mounting rack 5, and the upper end of the first connecting rod 811 is located obliquely above the upper end of the second connecting rod 812 near one side of the main rack body 1.

[0034] The lower ends of the two first connecting rods 811 in the two traction units 81 are connected through a first support pivot 9, and the lower ends of the two second connecting rods 812 are connected through a second support pivot 10; a support seat 11 is arranged below the mounting rack 5, the first support pivot 9 and the second support pivot 10 both horizontally penetrate the support seat 11 along the width direction of the main rack body 1, and the first support pivot 9 and the second support pivot 10 are both rotationally connected with the support seat 11, the first support pivot 9 is connected with the power unit 82, and the power unit 82 can drive the first support pivot 9 to rotate around its axis.

[0035] In the above embodiment, the upper ends of the first connecting rod 811 and the second connecting rod 812 are hingedly connected with the mounting rack 5, and the lower ends of the first connecting rod 811 and the second connecting rod 812 are rotationally connected with the support seat 11 through the first support pivot 9 and the second support pivot 10, so that a structure similar to a four-bar linkage mechanism can be formed between the mounting rack 5, the first connecting rod 811, the second connecting rod 812 and the support seat 11, and when the power unit 82 drives the first support pivot 9 on the first connecting rod 811 to rotate, the upper ends of the first connecting rod 811 and the second connecting rod 812 in the two traction units 81 will pull the mounting rack 5 to swing up and down in a horizontal state.

[0036] As shown in Figure 2 The power unit 82 of the present application can place the bottom of the mounting rack 5 completely on the ground when adjusting the height of the mounting rack 5 in the vertical direction through the first connecting rod 811 and the second connecting rod 812, so as to reduce the height difference as much as possible when workers take and place the centrifugal fan 6 on the mounting rack 5, and the height difference when taking and placing the centrifugal fan 6 will be reduced accordingly, which can reduce the force required by workers when taking and placing the centrifugal fan 6, so as to improve the efficiency of workers when detecting the centrifugal fan 6.

[0037] Further, as shown in Figures 1-3 The support seat 11 is installed at the lower end of the main rack body 1 near the mounting rack 5.

[0038] In the above embodiment, the support base 11 is installed at the lower end of the main frame body 1 near the mounting rack 5, so that the space below the main frame body 1 can be effectively utilized, thereby reducing the space occupied by the entire experimental device during use, and also making the overall structure of the application more compact.

[0039] Further, as shown in Figures 1-4 The power unit 82 includes an adjusting hydraulic cylinder 821 and a rotating rod 822, one end of the rotating rod 822 is sleeved in the middle position of the first support shaft 9 and is fixedly connected therebetween, the other end of the rotating rod 822 is hinged to the output end of the adjusting hydraulic cylinder 821, and the other end of the adjusting hydraulic cylinder 821 is hinged to a fixed plate 823 which is fixedly installed on the main frame body 1.

[0040] In the above embodiment, when the air inlet of the centrifugal fan 6 on the mounting rack 5 is opposite to the air outlet of the air pipe 2 on the main frame body 1, the first connecting rod 811 and the second connecting rod 812 are inclined from the support base 11 to the mounting rack 5, at this time, the output end of the adjusting hydraulic cylinder 821 connected to the rotating rod 822 on the first support shaft 9 at the lower end of the two first connecting rods 811 is in an extended state, at this time, the adjusting hydraulic cylinder 821 can realize the effect of fixedly installing the mounting rack 5 by limiting the rotating rod 822, so as to ensure that the centrifugal fan 6 on the mounting rack 5 is stable enough during detection. When the centrifugal fan 6 needs to be taken down after completing the detection work, the output end of the adjusting hydraulic cylinder 821 can start to retract, and in the process of retraction, the first support shaft 9 will be rotated clockwise through the rotating rod 822, and the first support shaft 9 will be rotated through the two first connecting rods 811, and the four-bar linkage structure formed by the first connecting rod 811 and the second connecting rod 812 will slowly pull the mounting rack 5 downward until the mounting rack 5 is stably placed down. During the operation of the adjusting hydraulic cylinder 821, since its two ends are respectively hinged to the fixed plate 823 and the rotating rod 822, it will timely adapt to the position change of the end of the rotating rod 822 through the change of its own angle and length during rotation. By controlling the adjusting hydraulic cylinder 821 to adjust the height of the mounting rack 5 in the vertical direction, the stability and convenience of the entire device during use can be improved.

[0041] Further, as shown in Figure 3 The rotating rod 822 is in an arc shape, and the opening side thereof faces away from the mounting rack 5.

[0042] In the above embodiment, the rotating rod 822 of the application is arranged in the above manner, which can improve the adjustment range of the output end of the adjusting hydraulic cylinder 821 when moving in one direction. For example, when the output end of the adjusting hydraulic cylinder 821 is retracted, the distance between the connecting end of the rotating rod 822 and the upper end of the main frame body 1 will increase due to the opening side of the rotating rod 822 facing downward, so that the movement distance of the output end of the adjusting hydraulic cylinder 821 when retracted will increase, and the adjustment range will also increase accordingly.

[0043] Further, as shown in Figure 1 The motor 7 and the centrifugal fan 6 are provided with a bearing 12, the bearing 12 is fixedly installed on the mounting frame 5, a sleeve 13 is installed at the center position of the bearing 12, one end of the sleeve 13 is fixedly connected with the output end of the motor 7, and the other end of the sleeve 13 is sleeved on the impeller shaft of the centrifugal fan 6 and fixedly connected with the impeller shaft through bolts.

[0044] In the above embodiment, the bearing 12 arranged between the motor 7 and the centrifugal fan 6 can support the output shaft of the motor 7 and the impeller shaft of the centrifugal fan 6 through the sleeve 13 in the bearing 12, so as to ensure that the motor 7 can stably drive the centrifugal fan 6 to operate. The sleeve 13 at the center of the bearing 12 and the impeller shaft of the centrifugal fan 6 are fixedly connected through bolts, so that the sleeve 13 on the bearing 12 can be disassembled when the centrifugal fan 6 is replaced later.

[0045] Further, as shown in Figure 4 The bottom of the mounting frame 5 is provided with a rubber buffer pad 14.

[0046] In the above embodiment, the rubber buffer pad 14 arranged at the bottom of the mounting frame 5 can play a buffering and damping effect when the mounting frame 5 is placed on the ground, so as to reduce the wear of the bottom of the mounting frame 5 and the vibration generated when the mounting frame 5 contacts the ground.

[0047] The implementation principle of the embodiment is that: when the experimental device of the application is in a state to be used, if the mounting rack 5 is placed on the ground, the output end of the adjusting hydraulic cylinder 821 is in a retracted state, at this time, the worker can directly place the centrifugal fan 6 to be detected on the mounting rack 5, if the mounting rack 5 is at a high position close to the upper end of the main rack body 1, the worker can first start the adjusting hydraulic cylinder 821 to place the mounting rack 5 on the ground, and then place the centrifugal fan 6 to be detected on the mounting rack 5. After the centrifugal fan 6 is installed on the mounting rack 5, first, the impeller shaft of the centrifugal fan 6 and the sleeve 13 in the bearing 12 on the mounting rack 5 are fixed together, and then the bottom of the centrifugal fan 6 and the mounting rack 5 are fixed. Next, the adjusting hydraulic cylinder 821 can be started, so that the output end of the adjusting hydraulic cylinder 821 gradually extends, and in the process of extension, the first support shaft 9 is counterclockwise rotated by the rotating rod 822, the two first connecting rods 811 on the first support shaft 9 are slowly pulled upward together with the two second connecting rods 812 on the second support shaft 10, until the flange joint of the inlet of the centrifugal fan 6 is opposite to the outlet of the air pipe 2 on the main rack body 1, and then the worker connects them together by using bolts and nuts, and then checks whether the lines of the sensors are connected well, and then the detection work of the centrifugal fan 6 can be started.

[0048] After the performance detection of the centrifugal fan 6 is completed, the bolts and nuts connecting the centrifugal fan 6 and the air pipe 2 are disassembled, the adjusting hydraulic cylinder 821 is started, and the output end thereof is retracted, the first support shaft 9 is clockwise rotated by the rotating rod 822, and the two first connecting rods 811 on the first support shaft 9 are slowly pulled downward together with the two second connecting rods 812 on the second support shaft 10 until the mounting rack 5 is placed on the ground, the centrifugal fan 6 whose performance is tested is disassembled, a new centrifugal fan 6 to be detected is placed, and the above operation is repeated. Compared with the prior art, the application is more convenient to use, and the worker can save more labor when taking and placing the centrifugal fan 6.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A centrifugal fan performance measurement experiment device, comprising a main frame (1), a wind pipe (2) is installed on the main frame (1), a pressure measurement sensor (3) is installed on the wind pipe (2), the pressure measurement sensor (3) is electrically connected with a control module (4) installed on the main frame (1), characterized in that: The horizontal mounting rack (5) is provided above the main frame body (1) near the air outlet side of the air pipe (2), a centrifugal fan (6) is mounted above the mounting rack (5) near one end of the air pipe (2), a flange joint is fixedly arranged at the air inlet of the centrifugal fan (6), and the flange joint on the centrifugal fan (6) is detachably connected with the air outlet of the air pipe (2) through bolts and nuts; An electric motor (7) is fixedly mounted above the mounting rack (5) away from one end of the air pipe (2), and the output end of the electric motor (7) is detachably connected with the impeller shaft of the centrifugal fan (6). A lifting mechanism (8) is arranged below the mounting rack (5), and the lifting mechanism (8) can adjust the height of the mounting rack (5) in the vertical direction.

2. The centrifugal fan performance measurement test apparatus according to claim 1, characterized by: The lifting mechanism (8) comprises two groups of traction units (81), and the two groups of traction units (81) are arranged on the two sides of the mounting rack (5) along the width direction of the main frame body (1), the upper end of the traction unit (81) is connected with the mounting rack (5), the lower end of the traction unit (81) is connected with a power unit (82), and the power unit (82) can control the height of the mounting rack (5) in the vertical direction through the two groups of traction units (81).

3. The centrifugal fan performance measurement test apparatus according to claim 2, characterized by: The traction unit (81) comprises a first connecting rod (811) and a second connecting rod (812), the lengths of the first connecting rod (811) and the second connecting rod (812) are equal, and the first connecting rod (811) and the second connecting rod (812) are arranged in parallel on the corresponding side of the mounting rack (5), the upper end of the first connecting rod (811) and the upper end of the second connecting rod (812) are rotatably connected with the mounting rack (5), and the upper end of the first connecting rod (811) is located obliquely above the upper end of the second connecting rod (812) near the side of the main frame body (1). The lower ends of the two first connecting rods (811) in the two traction units (81) are connected through a first supporting pivot (9), the lower ends of the two second connecting rods (812) are connected through a second supporting pivot (10), a supporting seat (11) is arranged below the mounting rack (5), the first supporting pivot (9) and the second supporting pivot (10) penetrate the supporting seat (11) horizontally along the width direction of the main frame body (1), and the first supporting pivot (9) and the second supporting pivot (10) are rotatably connected with the supporting seat (11), the first supporting pivot (9) is connected with the power unit (82), and the power unit (82) can drive the first supporting pivot (9) to rotate around the axis thereof.

4. The centrifugal fan performance measurement test apparatus according to claim 3, characterized by: The supporting seat (11) is mounted at the lower end of the main frame body (1) near the side of the mounting rack (5).

5. The centrifugal fan performance measurement test apparatus according to claim 3, characterized by: The power unit (82) comprises an adjusting hydraulic cylinder (821) and a rotating rod (822), one end of the rotating rod (822) is sleeved in the middle position of the first supporting rotating shaft (9) and is fixedly connected therebetween, the other end of the rotating rod (822) is hingedly connected with the output end of the adjusting hydraulic cylinder (821), the other end of the adjusting hydraulic cylinder (821) is hingedly connected with a fixing plate (823), and the fixing plate (823) is fixedly installed on the main frame body (1).

6. The centrifugal fan performance measurement test apparatus according to claim 5, characterized by: The rotating rod (822) is in an arc shape, and the opening side thereof faces away from the mounting rack (5).

7. The centrifugal fan performance measurement test apparatus according to any one of claims 1 to 6, characterized by: A bearing (12) is arranged between the electric motor (7) and the centrifugal fan (6), the bearing (12) is fixedly installed on the mounting rack (5), a sleeve pipe (13) is installed at the center position of the bearing (12), one end of the sleeve pipe (13) is fixedly connected with the output end of the electric motor (7), and the other end of the sleeve pipe (13) is sleeved on the impeller shaft of the centrifugal fan (6) and is fixedly connected therebetween through bolts.

8. The centrifugal fan performance measurement test apparatus according to any one of claims 1 to 6, characterized by: The bottom of the mounting rack (5) is provided with a rubber buffer gasket (14).

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