Device and method for testing heat dissipation air volume of high-voltage frequency converter unit

Abstract

The high-voltage frequency converter unit heat dissipation air volume testing device comprises a bottom plate, a shell, a centrifugal fan, an air rectifier and an operation table, the front portion and the rear portion in the shell are an air volume collecting cavity and a centrifugal air cavity, and the centrifugal fan is arranged in the centrifugal air cavity; the device is characterized in that the wind rectifier is composed of a plurality of air duct pipes, and the air duct pipes are provided with wind speed transmitters for measuring the wind speed flowing through inner cavities of the air duct pipes; the console is composed of a wind speed display and a low-voltage frequency converter. The test method comprises the following steps: a) setting parameters; b) placing a power unit; c) calculating the real-time air volume through Q = (V1 + V2 +... Vi +... + Vn) * A; d) testing an expected low wind speed; e) increasing the air volume; and f) obtaining an air volume interval. According to the heat dissipation air volume testing device and method, the problems that an existing handheld impeller anemograph is unstable and air volume sampling points are inconsistent are solved, the air volume testing result is high in stability and efficiency, and data are accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of air volume testing device and testing method, more specifically, especially a kind of high-voltage frequency converter unit heat dissipation air volume testing device and testing method. BACKGROUND

[0002] High-voltage frequency converter adopts the form of multiple power units cascade to form high-voltage frequency output, in order to ensure the stable work of power unit, it needs to dissipate heat, and the existing power unit heat dissipation mode is mainly air cooling.In related technologies, it is pointed out that the heat dissipation air volume of the power unit of high-voltage frequency converter is an important parameter index of heat dissipation performance and power module working performance, and this parameter index has great significance for the heat dissipation design of high-voltage frequency converter unit.The heat dissipation air volume test of power unit has always been a difficulty in testing, which has difficulties such as difficult air volume collection, large wind speed measurement error, difficult flow field control, and because the air volume collection generally needs different size tooling, the test cost is higher.

[0003] In the test sampling point of air volume, the end face of the outlet position of the air duct is always used to hold the impeller anemometer or wind speed probe to sample the wind speed data, and the sampling data error is large, on the one hand, the hand holding is unstable, such as the end face of liquid cooling anemometer cannot be guaranteed to be parallel to the air duct outlet end face, causing inaccurate sampling data;On the other hand, the wind speed sampling point position on the air duct outlet end face is not fixed, and the wind speed distribution on the actual air duct outlet end face is not uniform, and the wind speed is unstable, and the data of sampling points between test batches does not have horizontal comparison effect.Furthermore, the air volume adjustment control is unstable, so that the air volume cannot reach a relatively stable state in the air duct, which further aggravates the inaccuracy of test results. SUMMARY

[0004] The present application provides a kind of high-voltage frequency converter unit heat dissipation air volume testing device and testing method to overcome the shortcomings of the above technical problems.

[0005] The high-voltage frequency converter unit heat dissipation air volume testing device of the present application, comprising a base plate, a shell, a centrifugal fan, an air flow rectifier and an operating platform, the shell is fixed on the base plate, the front part in the shell is an air volume collection cavity, the front side of the air volume collection cavity is a collection air inlet, the power unit to be tested is clamped on the collection air inlet in the form of its air outlet facing the air volume collection cavity; the rear part in the shell is a centrifugal air cavity, the centrifugal fan is arranged in the centrifugal air cavity, the air inlet of the centrifugal fan is communicated with the air volume collection cavity, and the air outlet of the centrifugal fan is communicated with the centrifugal air cavity; characterized in that: the air flow rectifier is composed of a plurality of air duct pipes arranged uniformly, the inner end of the air duct pipe is communicated with the centrifugal air cavity, the outer end of the air duct pipe is communicated with the external environment, and a wind speed transmitter for measuring the wind speed flowing through the inner cavity of the air duct pipe is arranged on the air duct pipe; the operating platform is composed of a support vertical plate, a wind speed display and a low-voltage frequency converter fixed on the support vertical plate, the support vertical plate is fixed on the base plate, the wind speed display is connected with the wind speed transmitter, the wind speed display is used for displaying the wind speed measured by the wind speed transmitter, and the low-voltage frequency converter is connected with the centrifugal fan, the low-voltage frequency converter controls the rotating speed of the centrifugal fan by adjusting the power supply frequency, and then the air volume is adjusted.

[0006] The high-voltage frequency converter unit heat dissipation air volume testing device of the present application, a support frame and two end plates are arranged on the air flow rectifier, the two ends of the air duct pipe are respectively fixed on the two end plates, and the two end plates are both fixed on the support frame, and the support frame is fixed on the base plate.

[0007] The high-voltage frequency converter unit heat dissipation air volume testing device of the present application, side wind baffles are arranged on the left and right sides of the collection air inlet, an upper wind baffle is arranged on the upper side of the collection air inlet, a horizontal long sliding hole is formed in the side wind baffle, a vertical long sliding hole is formed in the upper wind baffle, and the side wind baffle and the upper wind baffle are respectively fixed on the front wall of the air volume collection cavity through the rotary knob fixers penetrating through the horizontal long sliding hole and the vertical long sliding hole; the size of the collection air inlet is changed by changing the positions of the side wind baffles and the upper wind baffle, so as to cooperate with power units of different sizes.

[0008] The high-voltage frequency converter unit heat dissipation air volume testing device of the present application, a base plate frame supporting the base plate is arranged below the base plate, pulleys facilitating the starting of the air volume testing device are fixed on the two sides of the base plate frame, and a handrail facilitating pushing is fixed on one side of the base plate.

[0009] The testing method of the high-voltage frequency converter unit heat dissipation air volume testing device of the present application, characterized in that the following steps are implemented: a. Parameter setting; the number of air ducts and wind speed transmitters is n, the cross-sectional area of the air duct inner cavity is A, the air volume adjustment range of the centrifugal fan is 0 m 3 / s~Q max m 3 / s, and the expected air volume interval of the power unit to be tested is [Q th1 m3 / s, Q th2 m 3 / s], 0 th1 Q th2 Q max ; b). The placement of the power unit; place the power unit at the collection inlet in a manner that the outlet of the power unit to be tested faces the air volume collection chamber, and move the side baffle and the upper baffle to be clamped on the outer surface of the power unit housing; c). Real-time air volume calculation; first start the power unit to run at rated power; then start the centrifugal fan, and calculate the real-time air volume flowing through the power unit by formula (1): Q = (V1 + V2 + … Vi + … + Vn) * A (1) Wherein, Q is the real-time air volume flowing through the power unit, Vi is the wind speed value of the air duct pipe (9) measured by the wind speed transmitter i, and A is the cross-sectional area of the air duct pipe inner cavity; d). Test of expected low air speed; adjust the speed of the centrifugal fan through the low-voltage frequency converter to make Q = Q th1 At this time, keep the speed of the centrifugal fan unchanged, and make the power unit work for a certain test duration. If the power unit does not appear high temperature alarm within the test duration, execute step f); if the power unit appears high temperature alarm within the test duration, execute step e); e). Increase the air volume; make Q th1 = Q th1 +△Q, Q th2 = Q th2 +△Q, execute step d); f). Obtain the air volume interval; the obtained air volume interval [Q th1 m 3 / s, Q th2 m 3 / s] meets the air cooling heat dissipation demand of the power unit to be tested.

[0010] The high-voltage frequency converter unit heat dissipation air volume testing device and testing method has the advantages that the air volume collecting cavity, centrifugal air cavity, centrifugal fan, air rectifier, wind speed display and low-voltage frequency converter constitute an operation table, the air rectifier is composed of a plurality of air ducts which are parallel to each other and arranged uniformly, the air speed transmitters for measuring the air flow rate through the inner cavities of the air ducts are arranged on each air duct, the centrifugal fan is arranged in the centrifugal air cavity, the air inlet and outlet of the centrifugal fan are communicated with the air volume collecting cavity and the centrifugal air cavity respectively, the inner and outer ends of the air ducts are communicated with the centrifugal air cavity and the external environment respectively, and the power unit to be tested is placed on the air inlet collecting port with the air outlet facing the air volume collecting cavity, so that the external airflow flows through the power unit, the air volume collecting cavity, the centrifugal fan and the air ducts in sequence and is discharged.

[0011] It can be seen that, since the air volume transmitters are used to collect the air speed through each air duct, the sizes of the air ducts are consistent, and the positions of the air ducts and the air volume transmitters are fixed, the problem of instability of the existing handheld impeller air speed instrument is solved, and the problem of inconsistency of air volume sampling points is also solved, the sum of the products of the air speed of each air duct and the cross-sectional area of the inner cavity thereof is used to obtain the air volume, the three-dimensional fluid turbulent flow model is simplified into a one-dimensional laminar flow model for calculation, the fluid flow state in the pipe is relatively stable, and the problem of instability of the end face air volume data is solved, so that the air volume testing result has high stability and high efficiency, and the data is accurate; the expected air volume interval [Q th1 m 3 / s, Q th2 m 3 / s] of the tested power unit can be used as the heat dissipation air volume value of the high-voltage frequency converter after the power unit is assembled, so that the heat dissipation demand of the power unit can be met, the high-temperature protection or alarm of the power unit can be avoided, and the energy consumption of air duct heat dissipation can be reduced.

[0012] Further, the side wind baffle and the upper wind baffle are arranged on both sides and above the air inlet collecting port respectively, the side wind baffle and the upper wind baffle are fixed on the front wall of the air volume collecting cavity through the knob fixers passing through the horizontal long sliding hole and the vertical long sliding hole on the side wind baffle and the upper wind baffle respectively, and the size of the air inlet collecting port can be adjusted by changing the positions of the side wind baffle and the upper wind baffle, so that the air inlet collecting port can be adapted to power units of different models and sizes. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a front view of the high-voltage frequency converter unit heat dissipation air volume testing device of the application; Figure 2 It is a rear view of the high-voltage frequency converter unit heat dissipation air volume testing device of the application; Figure 3 It is a left view of the high-voltage frequency converter unit heat dissipation air volume testing device of the application; Figure 4 Right view of the high-voltage frequency converter unit heat dissipation air volume testing device of the present application; Figure 5 Top view of the high-voltage frequency converter unit heat dissipation air volume testing device of the present application; Figure 6 Bottom view of the high-voltage frequency converter unit heat dissipation air volume testing device of the present application; Figure 7 Perspective view of the high-voltage frequency converter unit heat dissipation air volume testing device of the present application; Figure 8 Sectional view of the high-voltage frequency converter unit heat dissipation air volume testing device of the present application; Figure 9 Perspective view of the high-voltage frequency converter unit heat dissipation air volume testing device of the present application; Figure 10 Working principle diagram of the high-voltage frequency converter unit heat dissipation air volume testing device of the present application; Figure 11 Schematic diagram of the wind speed transmitter measuring the wind speed flowing through the air duct pipe in the present application; Figure 12 Perspective view of the wind rectifier in the present application; Figure 13 Perspective view of the air volume collector in the present application.

[0014] In the figure: 1 bottom plate, 2 shell, 3 air volume collection cavity, 4 centrifugal fan, 5 air rectifier, 6 collection air inlet, 7 wind speed display, 8 low-voltage frequency converter, 9 air duct pipe, 10 wind speed transmitter, 11 support frame, 12 end plate, 13 support vertical plate, 14 side wind baffle, 15 upper wind baffle, 16 horizontal long sliding hole, 17 vertical long sliding hole, 18 knob holder, 19 handrail, 20 pulley, 21 bottom plate frame, 22 centrifugal air cavity, 23 operation table, 24 power unit. DETAILED DESCRIPTION

[0015] The present application will be further described below in combination with the drawings and examples.

[0016] As Figures 1 to 9As shown, the front view, rear view, left view, right view, top view, bottom view, perspective view and sectional view of the high-voltage frequency converter unit heat dissipation air volume testing device are shown, the high-voltage frequency converter unit heat dissipation air volume testing device is composed of a bottom plate 1, a shell 2, a centrifugal fan 4, an air flow straightener 5 and an operation table 23, the bottom plate 1 is a rectangular flat plate shape and plays a fixing and supporting role, the shell 2 is arranged on the bottom plate 1, the front part in the shell 1 is an air volume collecting cavity 3, and the rear part in the shell 1 is a centrifugal air cavity 22. The front side of the air volume collecting cavity 3 is a collection air inlet 6, and the air outlet of the power unit 24 to be tested is arranged in the collection air inlet 6, so that all the air flowing out of the power unit 24 to be tested flows into the air volume collecting cavity 3. The centrifugal fan 4 is arranged in the centrifugal air cavity 22, the air inlet of the centrifugal fan 4 is communicated with the air volume collecting cavity 3, and the air outlet of the centrifugal fan 4 is communicated with the centrifugal air cavity 22.

[0017] As shown, the air flow straightener 5 is composed of a plurality of uniformly arranged air duct pipes 9, all the air duct pipes 9 are arranged in parallel with each other, the air duct pipe 9 is a cylindrical tube shape, the inner end of the air duct pipe 9 is communicated with the centrifugal air cavity 22, and the outer end of the air duct pipe 9 is communicated with the external environment. The air speed transmitter 10 is arranged on each air duct pipe 9, the air speed transmitter 10 is arranged through the body wall of the air duct pipe 9, the two ends of the air speed transmitter 10 are located in the inside of the air duct pipe 9, and the signal sending end of the air speed transmitter 10 is located outside the air duct pipe 9.

[0018] As shown, the operation table 23 is composed of a supporting vertical plate 13, an air speed display 7 and a low-voltage frequency converter 8, the bottom end of the supporting vertical plate 13 is fixed on the bottom plate 1, and the air speed display 7 and the low-voltage frequency converter 8 are arranged on the upper part of the supporting vertical plate 13. The air speed display 7 is connected with the air speed transmitter 10, and the air speed of the air duct pipe 9 measured by the air speed transmitter 10 is displayed through the air speed display 7. The low-voltage frequency converter 8 is connected with the power supply end of the centrifugal fan 4, the low-voltage frequency converter 8 controls the rotating speed of the centrifugal fan 4 by adjusting the power supply frequency, so as to control the size of the air volume.

[0019] As shown, the air outlet of the power unit 24 to be tested is arranged at the position of the collection air inlet 6, the centrifugal fan 4 is controlled to rotate by the low-voltage frequency converter 8, so that the external air successively passes through the power unit 24, the air volume collecting cavity 3, the centrifugal fan 4, the centrifugal air cavity 22 and the air duct pipe 9, and is finally discharged. Figure 10 As shown, the working principle diagram of the high-voltage frequency converter unit heat dissipation air volume testing device is shown. As shown in the figure, Figure 11As shown in the figure, the schematic diagram of the wind speed transmitter measuring the wind speed flowing through the air duct pipe in the application is given. Since the sizes of all the air ducts 9 are communicated and the positions of the air ducts 9 and the air volume transmitter 10 are fixed, the airflow flowing through the air ducts 9 is relatively stable, the wind speed measured by the air volume transmitter 10 is more accurate, the problem of instability of the handheld impeller anemometer is solved, and the problem of inconsistency of the air volume sampling point is also solved.

[0020] At the same time, since the air ducts 9 parallel to each other are used as the output of the cooling airflow, it can be said that the three-dimensional fluid turbulent flow model is simplified to a one-dimensional laminar flow model for calculation, that is, the flow velocity along the main flow direction of the air ducts 9 is used as the sampling and calculation speed. In this way, the fluid flow state of the air ducts 9 is relatively stable, thereby solving the problem of instability of the end face air volume data.

[0021] In order to adapt the collection air inlet 6 to different models of power units 24, as shown, the left and right sides of the collection air inlet 6 are provided with side wind baffles 14, the upper side of the collection air inlet 6 is provided with an upper wind baffle 15, the side wind baffles 14 are provided with a plurality of transverse long sliding holes 16, and the upper wind baffle 15 is provided with two vertical long sliding holes 17. The side wind baffles 14 are fixed to the front wall of the air volume collection cavity 3 through the rotary knob fixers 18 penetrating through the transverse long sliding holes 16, and the upper wind baffle 15 is fixed to the wall of the air volume collection cavity 3 through the rotary knob fixers 18 penetrating through the vertical long sliding holes 17, as shown in the figure. Figure 13 As shown in the figure, the three-dimensional view of the air volume collector in the application is given. In this way, by changing the positions of the side wind baffles 14 and the upper wind baffle 15, the size of the collection air inlet 6 can be changed to adapt to different models of power units 24.

[0022] As shown in the figure, the air flow straightener 5 further includes a support frame 11 and two end plates 12, both ends of all the air ducts 9 are fixed to the two end plates 12, the two end plates 12 are fixed to the support frame 11, the support frame 11 is fixed to the bottom plate 1, and the inner end plate 12 also plays a sealing role on the centrifugal air cavity 22, so that all the airflow flowing out of the centrifugal air cavity 22 flows out through the air ducts 9.

[0023] As shown in the figure, the bottom plate 1 is provided below the bottom plate frame 21, the bottom plate 1 is fixed to the bottom plate frame 21, both sides of the bottom plate frame 21 are fixed with a plurality of pulleys 20, and one end of the bottom plate 1 is fixed with a handrail frame 19. Testers can conveniently adjust the position of the entire test device by pushing the handrail frame 19.

[0024] The test method of the high-voltage frequency converter unit heat dissipation air volume test device of the application is realized through the following steps: a. Parameter setting; the number of air ducts 9 and wind speed transmitters 10 is n, the cross-sectional area of the air duct 9 is A, the air volume adjustment range of the centrifugal fan 4 is 0m 3 / s~Qmax m 3 / s, the expected air volume range of the power unit 24 to be tested is [Q th1 m 3 / s, Q th2 m 3 / s], 0 < Q th1 < Q th2 < Q max ; b) Placing the power unit; place the power unit 24 at the collection inlet 6 in such a way that the air outlet of the power unit 24 faces the air volume collection chamber 3, and move the movable side baffle 14 and the upper baffle 15 to be clamped on the outer surface of the power unit housing; c) Real-time air volume calculation; first, start the power unit 24 to operate at rated power; then, start the centrifugal fan 4, and calculate the real-time air volume flowing through the power unit by formula (1): Q = (V1 + V2 + … Vi + … + Vn) * A (1) Wherein, Q is the real-time air volume flowing through the power unit, Vi is the air speed value of the air duct pipe (9) measured by the air speed transmitter i, and A is the cross-sectional area of the air duct pipe inner cavity; d) Test at expected low air speed; adjust the speed of the centrifugal fan 4 through the low-voltage frequency converter 8 to make Q = Q th1 , at this time, keep the speed of the centrifugal fan 3 unchanged, and make the power unit 14 work for a certain test duration, if the power unit 24 does not appear high temperature alarm within the test duration, execute step f); if the power unit 24 appears high temperature alarm within the test duration, execute step e); e) Increase air volume; make Q th1 = Q th1 +△Q, Q th2 = Q th2 +△Q, execute step d); f) Obtain air volume range; the obtained air volume range [Q th1 m 3 / s, Q th2 m 3 / s] meets the air cooling heat dissipation requirement of the power unit 24 to be tested.

[0025] For example, the air volume adjustment range of the centrifugal fan 4 is 0m 3 / s~2m 3 / s, the expected air volume range of the power unit 24 to be tested is [0.2m 3 / s, 0.4m 3 / s],△Q=0.05m 3 / s, in step d), if the power unit 24 to be tested is kept at 0.2m 3 / s. If the power unit 24 has high temperature alarm in the test duration, then Q th1 = 0.2m 3 / s+0.05m 3 / s=0.25m 3 / s, step d) is re-executed. If the power unit 24 has no high temperature alarm in the test duration, then the expected air volume interval of the power unit 24 is [0.25m 3 / s, 0.45m 3 / s], which indicates that the power unit can be guaranteed to dissipate heat when the air volume of the power unit 24 is in the interval [0.25m 3 / s, 0.45m 3 / s], and has lower energy consumption.

Claims

1. A high-voltage inverter unit heat dissipation air volume test device, comprising a base plate (1), a shell (2), a centrifugal fan (4), an air rectifier (5) and an operating table (23), wherein the shell is fixed to the base plate, the front portion of the shell is an air volume collection chamber (3), the front side of the air volume collection chamber is an air collection inlet (6), the power unit (24) to be tested is clamped on the air collection inlet in the form of its air outlet facing the air volume collection chamber; the rear portion of the shell is a centrifugal air chamber (22), the centrifugal fan is arranged in the centrifugal air chamber, the air inlet of the centrifugal fan is communicated with the air volume collection chamber, and the air outlet of the centrifugal fan is communicated with the centrifugal air chamber; the device is characterized in that: The wind rectifier (5) is composed of a plurality of evenly arranged air duct tubes (9), the inner ends of the air duct tubes are communicated with the centrifugal air cavity, and the outer ends of the air duct tubes are communicated with the external environment. The air duct tubes are provided with a wind speed transmitter (10) for measuring the wind speed flowing through the inner cavity thereof; the operating table is composed of a supporting vertical plate (13), a wind speed display (7) fixed on the supporting vertical plate, and a low-voltage frequency converter (8), the supporting vertical plate being fixed on the base plate, the wind speed display being connected to the wind speed transmitter, the wind speed display being used to display the wind speed measured by the wind speed transmitter, the low-voltage frequency converter being connected to the centrifugal fan, and the low-voltage frequency converter controlling the rotation speed of the centrifugal fan by adjusting the power supply frequency, thereby adjusting the air volume.

2. The high-voltage inverter unit heat dissipation air volume test device according to claim 1, characterized in that: The wind rectifier (5) is provided with a support frame (11) and two end plates (12), the two ends of the air duct tube (9) are respectively fixed to the two end plates, the two end plates are both fixed to the support frame, and the support frame is fixed to the bottom plate (1).

3. The high-voltage inverter unit heat dissipation air volume test device according to claim 1 or 2, characterized in that: The left and right sides of the air collection inlet (6) are both provided with side wind shields (14), and the upper side of the air collection inlet is provided with an upper wind shield (15). The side wind shields are provided with transverse long sliding holes (16), and the upper wind shield is provided with vertical long sliding holes (17). The side wind shields and the upper wind shield are fixed to the front wall of the air volume collection chamber (3) via knob fixers (18) passing through the transverse long sliding holes and the vertical long sliding holes, respectively. The size of the air collection inlet is changed by changing the positions of the side wind shields and the upper wind shield to match power units (24) of different sizes.

4. The high-voltage inverter unit heat dissipation air volume test device according to claim 1 or 2, characterized in that: A base frame (21) supporting the base plate (1) is provided below the base plate, pulleys (20) for facilitating the actuation of the air volume test device are fixed on both sides of the base frame, and a handrail (19) for facilitating hand pushing is fixed on one side of the base plate.

5. A test method based on the high-voltage inverter unit heat dissipation air volume test device according to claim 1, characterized in that: This is achieved by following these steps: a). Parameter setting: Assume that the number of air ducts (9) and wind speed transmitters (10) is n, the cross-sectional area of ​​the air duct cavity is A; the air volume adjustment range of the centrifugal fan is 0m 3 / s~Q max m 3 / s, the expected air volume range of the power unit to be tested (24) is [Q th1 m 3 / s,Q th2 m 3 / s],0<Q th1 <Q th2 <Q max ; b) Placement of the power unit; Place the power unit at the air collection inlet (6) with the air outlet of the power unit (24) to be tested facing the air volume collection chamber (3), and move the side windshield (14) and the upper windshield (15) so that they are stuck on the outer surface of the power unit housing; c) Real-time air volume calculation: First, turn on the power unit (24) and make it run at rated power; then, turn on the centrifugal fan (4) and calculate the real-time air volume flowing through the power unit using formula (1): Q=(V1+V2+…Vi+…+Vn)*A (1) Wherein, Q is the real-time air volume flowing through the power unit, Vi is the wind speed value of the air duct (9) measured by the wind speed transmitter i, and A is the cross-sectional area of ​​the inner cavity of the air duct; d) Test for expected low wind speed; adjust the speed of the centrifugal fan through the low-voltage inverter to make Q=Q th1 At this time, the speed of the centrifugal fan is kept constant, and the power unit (24) is operated for a certain test time. If the power unit does not have a high temperature alarm during the test time, step f) is executed; if the power unit has a high temperature alarm during the test time, step e) is executed; e). Increase the air volume; make Q th1 = Q th1 +△Q,Q th2 = Q th2 +△Q, go to step d); f). Obtain air volume interval; the obtained air volume interval [Q th1 m 3 / s,Q th2 m 3 / s] to meet the air cooling and heat dissipation requirements of the power unit to be tested (24).

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