A temperature distribution control device for high-power power electronic devices

Abstract

The application relates to a temperature distribution control device for a high-power power electronic device, which comprises an outer shell, a first rotating drum, a second rotating drum and a rotating shaft, the left end of the rotating shaft is provided with a first gearbox, the right end of the rotating shaft is provided with a second gearbox, the left end of the first gearbox is fixedly provided with a power box, a driving motor is fixedly arranged in the power box, when the temperature of fluid is detected, the rotating speeds of first blades, second blades and third blades are gradually reduced under the action of the first gearbox and the second gearbox, the flow rates of fluids in different intervals are controlled, the fluids entering the outer shell in different time periods are gathered at the outlet of the outer shell, the temperature fluctuations of the fluids in different time periods are balanced, the temperature distribution of the fluids is uniform, interference temperature signals generated when the fluids flow in the temperature distribution part are filtered out, and the temperature inside the high-power electronic device is accurately detected.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of power electronics, and particularly relates to a temperature distribution control device for a high-power power electronic device. BACKGROUND

[0002] In use, a high-power power electronic device needs to be installed with a static var generator (SVG) or an active power filter (APF) according to different requirements of use sites. The static var generator (SVG), also known as static synchronous compensator, is a device for dynamic var compensation by free commutation of power semiconductor bridge converters. Wherever there is a low-voltage transformer or near a large power equipment, a var compensation device should be provided, especially for those industrial and mining enterprises, residents with low power factor, which must be installed with SVG. The installation of compensation equipment is an effective measure to improve power supply conditions and improve power utilization rate. The active power filter (APF) is a new type of power electronic device for dynamic harmonic suppression and var compensation, which can compensate for harmonics and var of different sizes and frequencies. It is mainly applied in unstable load application occasions, non-ferrous metallurgy, port machinery, electrified railways, high-precision automatic production lines, office buildings, large commercial areas, energy-saving lamps and air conditioning centralized places. Whether it is SVG to improve power utilization rate or APF, although the application fields are different, they are all for the purpose of var compensation and maintaining the stability of load current in the circuit. Therefore, in order to stabilize the work, the high-power power electronic device with SVG and APF needs to have a stable working environment, especially a stable temperature environment.

[0003] The existing high-power power electronic device is prone to uneven temperature distribution due to uneven heat dissipation, which affects the service life of the device and generates disturbance interference signals for temperature detection. Due to the interference of disturbance signals, the temperature of the fluid is not easy to be stabilized at the set value, so that the temperature detection device of the prior art cannot accurately measure the temperature of the fluid.

[0004] In order to solve the problem of temperature distribution of high-power power electronic devices, Chinese patent CN108007593B uses the thermal energy stored in the energy storage part to gradually release heat as the temperature trough fluid arrives, reestablishes the temperature field, and the temperature of the blind end part as the temperature measuring part does not decrease significantly, and the temperature at this place is still in a stable state; such a cycle, the filter repeatedly reconstructs the temperature field through the heat process, but the temperature of the blind hole end part as the temperature measuring part does not change significantly, and the filter filters out the disturbance temperature signal generated when the fluid flows with uneven temperature distribution through the complex heat transfer process of heat absorption, heat storage, heat release, etc., and realizes accurate detection of the temperature of the fluid. However, the filter in the complex heat transfer process of heat absorption, heat storage, heat release, etc. will cause heat loss, resulting in large detection error. Therefore, in view of the deficiencies of the prior art, further improvement is needed. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a temperature distribution control device for high-power power electronic devices to solve the above problems.

[0006] To achieve the above purpose, the technical solution adopted by the present application is: a temperature distribution control device for high-power power electronic devices, comprising a shell, a first rotating cylinder, a second rotating cylinder and a rotating shaft, the shell, the first rotating cylinder and the second rotating cylinder are all cylindrical structures with left and right ends open, the right end of the shell is the inlet, and the left end of the shell is the outlet, the first rotating cylinder and the second rotating cylinder are concentrically distributed inside the shell, and the rotating shaft is arranged at the central axis of the shell, the first rotating cylinder and the second rotating cylinder, the left end of the rotating shaft is provided with a first speed changer, and the right end of the rotating shaft is provided with a second speed changer, the side walls of the first speed changer and the second speed changer are both fixed with first supporting rods, and the first supporting rods are fixedly connected with the shell, the rotating shaft is uniformly provided with first blades, the outer wall of the second rotating cylinder is uniformly provided with second blades, and the outer wall of the first rotating cylinder is uniformly provided with third blades, the two ends of the rotating shaft are rotatably sleeved with first collars, four second supporting rods are annularly distributed on each first collar, the second supporting rods are fixedly connected with the second rotating cylinder, the second rotating cylinder can rotate relative to the rotating shaft while being supported by the second supporting rods, the outer wall of the second rotating cylinder is rotatably sleeved with a second collar, and four third supporting rods are annularly distributed on the second collar, the third supporting rods are fixedly connected with the first rotating cylinder, and the first rotating cylinder can rotate relative to the second rotating cylinder while being supported by the third supporting rods.

[0007] The right side of the first gearbox body is conical, reducing the resistance of fluid, the power box is fixed at the left end of the first gearbox, the driving motor is fixed in the power box, the output shaft of the driving motor is horizontally right, and the output shaft of the driving motor is inserted into the first gearbox, the first high-speed rotating shaft is arranged in the first gearbox, the left end of the first high-speed rotating shaft is fixedly connected with the output shaft of the driving motor, the first central gear is fixed on the first high-speed rotating shaft, and the first low-speed rotating cylinder is rotatably sleeved on the first high-speed rotating shaft, the right end of the first low-speed rotating cylinder and the right end of the first high-speed rotating shaft are arranged on the right side of the first gearbox, the first planetary carrier is arranged at the left end of the first low-speed rotating cylinder, the four first positioning shafts are fixed on the first planetary carrier, the first planetary gear is rotatably sleeved on each first positioning shaft, the first planetary gear is meshed with the first central gear, the first gear ring is fixed in the first gearbox, and the first gear ring is meshed with the first planetary gear, the first high-speed rotating shaft is fixedly connected with the left end of the rotating shaft, the rotating shaft is driven to rotate by the first high-speed rotating shaft, and the four fifth supporting rods are fixed on the first low-speed rotating cylinder.

[0008] The right side of the second gearbox body is conical, reducing the resistance of fluid, the second high-speed rotating shaft is arranged in the second gearbox, the second central gear is fixed on the second high-speed rotating shaft, the second low-speed rotating cylinder is rotatably sleeved on the second high-speed rotating shaft, the left end of the second low-speed rotating cylinder and the left end of the second high-speed rotating shaft are arranged on the left side of the second gearbox, the second planetary carrier is arranged at the right end of the second low-speed rotating cylinder, the four second positioning shafts are fixed on the second planetary carrier, the second planetary gear is rotatably sleeved on each second positioning shaft, the second planetary gear is meshed with the second central gear, the second gear ring is fixed in the second gearbox, and the second gear ring is meshed with the second planetary gear, the four sixth supporting rods are fixed on the second high-speed rotating shaft, the sixth supporting rods are fixedly connected with the second rotating cylinder, the second high-speed rotating shaft is driven to rotate when the second rotating cylinder rotates through the sixth supporting rods, and the four seventh supporting rods are fixed on the second low-speed rotating cylinder, the seventh supporting rods are fixedly connected with the first rotating cylinder, and the first rotating cylinder is driven to rotate by the second low-speed rotating cylinder.

[0009] Preferably, the temperature sensor is arranged in the left end outlet of the shell body, the fourth supporting rod is fixed on the temperature sensor, and the fourth supporting rod is fixedly connected with the left end outlet of the shell body.

[0010] The beneficial effects of the present application are: when detecting the temperature of a large-power power electronic device such as SVG or APF, under the action of the first gearbox and the second gearbox, the rotating speeds of the first blade, the second blade and the third blade gradually decrease, the fluid entering the outer shell is divided into three parts by the first rotating cylinder and the second rotating cylinder, and because the rotating speeds of the first blade, the second blade and the third blade gradually decrease, the flow rate of the fluid in the second rotating cylinder is greater than the flow rate of the fluid between the first rotating cylinder and the second rotating cylinder, and the flow rate of the fluid between the first rotating cylinder and the second rotating cylinder is greater than the flow rate of the fluid between the first rotating cylinder and the outer shell, by controlling the flow rates of the fluids in different intervals, the fluids entering the inside of the outer shell in different time periods are collected at the outlet of the outer shell, the temperature fluctuations of the fluids in different time periods are balanced, the temperature distribution of the fluids is uniform, the interference temperature signals generated when the fluids flow in the temperature distribution part are filtered out, and the temperature of the fluids is accurately detected; by controlling the flow rate of the fluids, different airflows in the fluctuation period are mixed directly, the temperature of the fluids is stabilized at the set value of the temperature, the temperature inside is accurately detected, and the service life is improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the main structure diagram of the present application;

[0012] Figure 2 It is the internal structure diagram of the first gearbox of the present application;

[0013] Figure 3 It is the internal structure diagram of the second gearbox of the present application;

[0014] Figure 4 It is the present application Figure 1 It is the sectional view of the A-A part in the present application.

[0015] In the figure, 1 is an outer shell, 2 is a first rotating cylinder, 3 is a second rotating cylinder, 4 is a rotating shaft, 5 is a first gearbox, 6 is a second gearbox, 7 is a first supporting rod, 8 is a first blade, 9 is a second blade, 10 is a third blade, 11 is a first collar, 12 is a second supporting rod, 13 is a second collar, 14 is a third supporting rod, 15 is a temperature sensor, 16 is a fourth supporting rod, 17 is a power box, 18 is a driving motor, 19 is a first high-speed rotating shaft, 20 is a first central gear, 21 is a first low-speed rotating cylinder, 2101 is a first planet carrier, 2102 is a first positioning shaft, 22 is a first planetary gear, 23 is a first tooth ring, 24 is a fifth supporting rod, 25 is a second high-speed rotating shaft, 26 is a second central gear, 27 is a second low-speed rotating cylinder, 2701 is a second planet carrier, 2702 is a first positioning shaft, 28 is a second planetary gear, 29 is a second tooth ring, 30 is a sixth supporting rod, and 31 is a seventh supporting rod. DETAILED DESCRIPTION

[0016] The present application will be further described in detail below in combination with the drawings and specific embodiments:

[0017] AsFigures 1-4 As shown in the figure, a temperature distribution control device for high-power power electronic devices comprises an outer shell 1, a first rotating cylinder 2, a second rotating cylinder 3 and a rotating shaft 4, the outer shell 1, the first rotating cylinder 2 and the second rotating cylinder 3 are all cylindrical structures with both ends open, the right end of the outer shell 1 is an inlet, and the left end of the outer shell 1 is a tapered outlet, the first rotating cylinder 2 and the second rotating cylinder 3 are concentrically distributed inside the outer shell 1, and the rotating shaft 4 is arranged at the central axis position of the outer shell 1, the first rotating cylinder 2 and the second rotating cylinder 3, the left end of the rotating shaft 4 is provided with a first speed changer 5, and the right end of the rotating shaft 4 is provided with a second speed changer 6, the side wall of the first speed changer 5 and the second speed changer 6 is symmetrically fixed with a first supporting rod 7, the first supporting rod 7 is fixedly connected with the outer shell 1, the rotating shaft 4 is uniformly provided with a first blade 8, the outer wall of the second rotating cylinder 3 is uniformly provided with a second blade 9, and the outer wall of the first rotating cylinder 2 is uniformly provided with a third blade 10, the two ends of the rotating shaft 4 are rotatably sleeved with a first sleeve ring 11, four second supporting rods 12 are annularly distributed on each first sleeve ring 11, the second supporting rods 12 are fixedly connected with the second rotating cylinder 3, the second rotating cylinder 3 is supported by the second supporting rods 12 at the same time, and the second rotating cylinder 3 can rotate relative to the rotating shaft 4, the outer wall of the second rotating cylinder 3 is rotatably sleeved with a second sleeve ring 13, the second sleeve ring 13 is annularly provided with four third supporting rods 14, the third supporting rods 14 are fixedly connected with the first rotating cylinder 2, the first rotating cylinder 2 is supported by the third supporting rods 14 at the same time, and the first rotating cylinder 2 can rotate relative to the second rotating cylinder 3.

[0018] In the embodiment, the right side of the first speed changer 5 is tapered to reduce the resistance of the fluid, the left end of the first speed changer 5 is fixedly connected with a power box 17, the power box 17 is fixedly connected with a driving motor 18, the output shaft of the driving motor 18 is horizontally rightward, the output shaft of the driving motor 18 is inserted into the first speed changer 5, the first speed changer 5 is provided with a first high-speed rotating shaft 19, the left end of the first high-speed rotating shaft 19 is fixedly connected with the output shaft of the driving motor 18, the first high-speed rotating shaft 19 is fixedly connected with a first central gear 20, and the first high-speed rotating shaft 19 is rotatably sleeved with a first low-speed rotating cylinder 21, the right end of the first low-speed rotating cylinder 21 and the right end of the first high-speed rotating shaft 19 are both inserted into the right side of the first speed changer 5, the left end of the first low-speed rotating cylinder 21 is provided with a first planet carrier 2101, the first planet carrier 2101 is fixedly connected with four first positioning shafts 2102, each first positioning shaft 2102 is rotatably sleeved with a first planetary gear 22, the first planetary gear 22 is engaged with the first central gear 20, the first speed changer 5 is fixedly connected with a first tooth ring 23, the first tooth ring 23 is engaged with the first planetary gear 22, the first high-speed rotating shaft 19 is fixedly connected with the left end of the rotating shaft 4, the rotating shaft 4 is driven to rotate by the first high-speed rotating shaft 19, the first low-speed rotating cylinder 21 is fixedly connected with four fifth supporting rods 24, the fifth supporting rods 24 are fixedly connected with the second rotating cylinder 3, and the second rotating cylinder 3 is driven to rotate by the first low-speed rotating cylinder 21.

[0019] In the embodiment, the right side of the second gearbox 6 is conical, reducing the resistance of fluid. The second gearbox 6 is provided with a second high-speed rotating shaft 25. The second high-speed rotating shaft 25 is fixed with a second central gear 26. The second high-speed rotating shaft 25 is rotatably sleeved with a second low-speed rotating cylinder 27. The left end of the second low-speed rotating cylinder 27 and the left end of the second high-speed rotating shaft 25 both pass through the left side of the second gearbox 6. The right end of the second low-speed rotating cylinder 27 is provided with a second planet carrier 2701. The second planet carrier 2701 is fixed with four second positioning shafts 2702. Each second positioning shaft 2702 is rotatably sleeved with a second planetary gear 28. The second planetary gear 28 is engaged with the second central gear 26. The second gearbox 6 is internally fixed with a second gear ring 29. The second gear ring 29 is engaged with the second planetary gear 28. The second high-speed rotating shaft 25 is fixed with four sixth supporting rods 30. The sixth supporting rods 30 are fixedly connected with the second rotating cylinder 3. When the second rotating cylinder 3 rotates, the sixth supporting rods 30 drive the second high-speed rotating shaft 25 to rotate. The second low-speed rotating cylinder 27 is fixed with four seventh supporting rods 31. The seventh supporting rods 31 are fixedly connected with the first rotating cylinder 2. The second low-speed rotating cylinder 27 drives the first rotating cylinder 2 to rotate.

[0020] In the embodiment, the left end of the outer shell 1 is provided with a temperature sensor 15. The temperature sensor 15 is fixed with a fourth supporting rod 16. The fourth supporting rod 16 is fixedly connected with the left end of the outer shell 1.

[0021] The working principle of the present application is as follows: the temperature of the frequency converter heat dissipation device is detected when the high-power power electronics is working, so as to ensure the stable work of the SVG and the APF. Specifically, the driving motor 18 is started, the output shaft of the driving motor 18 drives the rotating shaft 4 to rotate at high speed through the first high-speed rotating shaft 19, drives the first blade 8 to rotate at high speed, the first central gear 20 on the first high-speed rotating shaft 19 and the first low-speed planetary gear 22 constitute a planetary gear reducer, and under the meshing transmission action of the first central gear 20 and the first low-speed planetary gear 22, the first low-speed rotating shaft 21 rotates, and the rotating speed of the first low-speed rotating shaft 21 is lower than that of the rotating shaft 4, the first low-speed rotating shaft 21 drives the second rotating shaft 3 to rotate through the fifth supporting rod 24, and further drives the second blade 9 to rotate, and the rotating speed of the second blade 9 is lower than that of the first blade 8, the second rotating shaft 3 drives the second high-speed rotating shaft 25 to rotate through the sixth supporting rod 30, the second central gear 26 on the second high-speed rotating shaft 25 and the second low-speed planetary gear 28 constitute a planetary gear reducer, and under the meshing transmission action of the second central gear 26 and the second low-speed planetary gear 28, the second low-speed rotating shaft 27 rotates, and the rotating speed of the second low-speed rotating shaft 27 is lower than that of the second high-speed rotating shaft 25, the second low-speed rotating shaft 27 drives the first rotating shaft 2 to rotate through the seventh supporting rod, and further drives the third blade 10 to rotate, and the rotating speed of the third blade 10 is lower than that of the second blade 9. Therefore, under the action of the first gearbox 5 and the second gearbox 6, the rotating speed of the first blade 8, the second blade 9 and the third blade 10 gradually decreases, the fluid entering the outer shell 1 is divided into three parts by the first rotating shaft 2 and the second rotating shaft 3, and because the rotating speed of the first blade 8, the second blade 9 and the third blade 10 gradually decreases, the flow rate of the fluid in the second rotating shaft 3 is greater than that between the first rotating shaft 2 and the second rotating shaft 3, and the flow rate of the fluid between the first rotating shaft 2 and the second rotating shaft 3 is greater than that between the first rotating shaft 2 and the outer shell 1. By controlling the flow rate of the fluid in different intervals, the fluid entering the outer shell 1 in different time periods is collected at the outlet of the outer shell 1, the temperature fluctuation of the fluid in different time periods is balanced, the temperature distribution of the fluid is uniform, the interference temperature signal generated during the flow of the fluid in the temperature distribution part is filtered out, and the temperature of the fluid in the power electronic device is accurately detected.

[0022] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A temperature distribution control device for high-power power electronic devices, comprising an outer housing, a first rotating drum, a second rotating drum and a rotating shaft, characterized in that: The outer shell, the first rotating drum and the second rotating drum are all open-ended cylindrical structures, the right end of the outer shell is an inlet, and the left end of the outer shell is a tapered outlet, the first rotating drum and the second rotating drum are concentrically arranged inside the outer shell, and the rotating shaft is arranged at the central axis of the outer shell, the first rotating drum and the second rotating drum, the left end of the rotating shaft is provided with a first speed changer, and the right end of the rotating shaft is provided with a second speed changer, the side wall of the first speed changer and the second speed changer is symmetrically fixed with a first supporting rod, the first supporting rod is fixedly connected with the outer shell, the rotating shaft is uniformly provided with a first blade, the outer wall of the second rotating drum is uniformly provided with a second blade, and the outer wall of the first rotating drum is uniformly provided with a third blade, the two ends of the rotating shaft are rotatably sleeved with a first sleeve ring, four second supporting rods are annularly arranged on each first sleeve ring, the second supporting rods are fixedly connected with the second rotating drum, the outer wall of the second rotating drum is rotatably sleeved with a second sleeve ring, the second sleeve ring is annularly provided with four third supporting rods, and the third supporting rods are fixedly connected with the first rotating drum. The right side of the first speed changer body is tapered, the left end of the first speed changer is fixedly connected with a power box, a driving motor is fixedly arranged in the power box, the output shaft of the driving motor is horizontally arranged to the right, the output shaft of the driving motor is inserted into the first speed changer, a first high-speed rotating shaft is arranged in the first speed changer, the left end of the first high-speed rotating shaft is fixedly connected with the output shaft of the driving motor, a first central gear is fixedly arranged on the first high-speed rotating shaft, a first low-speed rotating drum is rotatably sleeved on the first high-speed rotating shaft, the right end of the first low-speed rotating drum and the right end of the first high-speed rotating shaft are arranged to pass through the right side of the first speed changer, a first planet carrier is arranged at the left end of the first low-speed rotating drum, four first positioning shafts are fixedly arranged on the first planet carrier, a first planet gear is rotatably sleeved on each first positioning shaft, the first planet gear is meshed with the first central gear, a first gear ring is fixedly arranged in the first speed changer, and the first gear ring is meshed with the first planet gear. The right side of the second speed changer body is tapered, a second high-speed rotating shaft is arranged in the second speed changer, a second central gear is fixedly arranged on the second high-speed rotating shaft, a second low-speed rotating drum is rotatably sleeved on the second high-speed rotating shaft, the left end of the second low-speed rotating drum and the left end of the second high-speed rotating shaft are arranged to pass through the left side of the second speed changer, a second planet carrier is arranged at the right end of the second low-speed rotating drum, four second positioning shafts are fixedly arranged on the second planet carrier, a second planet gear is rotatably sleeved on each second positioning shaft, the second planet gear is meshed with the second central gear, a second gear ring is fixedly arranged in the second speed changer, and the second gear ring is meshed with the second planet gear.

2. A temperature profile control device for high power power electronic devices according to claim 1, characterized in that, A temperature sensor is arranged in the left end outlet of the outer shell, a fourth supporting rod is fixedly arranged on the temperature sensor, and the fourth supporting rod is fixedly connected with the left end outlet of the outer shell.

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