High-voltage comprehensive protector for protecting low-voltage frequency converter

Abstract

The utility model relates to the technical field of low-voltage frequency converters, and discloses a high-voltage comprehensive protector which is used for protecting a low-voltage frequency converter and comprises a low-voltage frequency converter body, a mutual inductor is arranged on the side face of the low-voltage frequency converter body, and a heat dissipation device is arranged on the back face of the low-voltage frequency converter body. The heat dissipation device comprises a first supporting L-shaped frame, a driving motor, a threaded rod, a threaded sleeve, a connecting top plate, a fan barrel, a built-in fan, a bearing box, a second supporting L-shaped frame, a limiting sliding rod, a limiting sliding block and heat dissipation fins. According to the high-voltage comprehensive protector, a low-voltage frequency converter is protected, a mutual inductor is installed on each phase of a main incoming line of the frequency converter, secondary lines of the mutual inductors are connected to the current input end of the high-voltage comprehensive protector to monitor the running current of the two frequency converters, and the maximum current of the full-load feeding amount is obtained through measurement. First-section quick-break protection is realized by adopting the measured maximum current 1.2 times zero second, and second-section over-current protection is realized by adopting the measured maximum current 1.1 times 2 second.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage frequency converters, in particular to a high-voltage comprehensive protector for protecting a low-voltage frequency converter. Background Art

[0002] The blast furnace winch is fed by two 250-kilowatt variable-frequency motors controlled by two frequency converters. The overcurrent multiple of the frequency converter is adjusted to achieve overload protection for the winch. This protection method has a large error and does not play a protective role. The material car derailed and stuck on the inclined bridge winch without stopping, causing the material car winch to break the furnace top sheave. In order to effectively protect the winch motor from overcurrent, it was finally decided to install a high-voltage integrated protector on the main incoming line of the winch inverter to monitor and control the current of the winch inverter.

[0003] However, the existing winch inverter is not equipped with equipment to monitor the inverter operating current, and the maximum current of full-load feeding cannot be measured. It is impossible to use the measured maximum current 1.2 times zero seconds to implement a quick-break protection. The effect during use is not good, and this needs to be improved. Utility Model Content

[0004] The purpose of the utility model is to provide a high voltage integrated protector for protecting a low voltage frequency converter, so as to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the utility model provides the following technical solutions: a high-voltage integrated protector protects a low-voltage inverter, comprising a low-voltage inverter body, a mutual inductor is arranged on the side of the low-voltage inverter body, and a heat dissipation device is arranged on the back of the low-voltage inverter body.

[0006] The low-voltage inverter body is internally provided with an inverter shutdown relay, an inverter incoming line circuit breaker, a current transformer and a high-voltage integrated protector. The inverter shutdown relay is electrically connected to the electric shock at the top of the high-voltage integrated protector. The high-voltage integrated protector is internally provided with a protective trip. The inverter incoming line circuit breaker and the current transformer are located in the main circuit, and the inverter incoming line circuit breaker is electrically connected to the current transformer. The inverter incoming line circuit breaker and the current transformer are connected in series.

[0007] Preferably, the heat dissipation device includes a first supporting L-shaped frame, a driving motor, a threaded rod, a threaded sleeve, a connecting top plate, a fan barrel, a built-in fan, a receiving box, a second supporting L-shaped frame, a limiting sliding rod, a limiting sliding block and cooling fins. The first supporting L-shaped frame is fixedly connected to the right end of the back side of the low-voltage inverter body, the driving motor is fixedly connected to the top of the first supporting L-shaped frame, the threaded rod is fixedly connected to the output shaft of the driving motor, the threaded sleeve is threadedly connected to the surface of the threaded rod, the connecting top plate is fixedly connected to the side of the first supporting L-shaped frame, the receiving box is fixedly connected to the front of the threaded sleeve, the fan barrel is fixedly connected to the back side of the receiving box, the built-in fan is fixedly connected to the inner wall of the fan barrel, the second supporting L-shaped frame is fixedly connected to the back side of the low-voltage inverter body, and the cooling fins are fixedly connected to the back side of the low-voltage inverter body.

[0008] Preferably, the back side of the heat dissipation fin is connected to the front side of the receiving box, and the front side of the receiving box is provided with a connecting air inlet slot.

[0009] Preferably, a connecting bearing is fixedly connected to the bottom of the connecting top plate, and the threaded rod is fixedly connected to the inner ring of the connecting bearing.

[0010] Preferably, there are two fan cylinders and two built-in fans, which are symmetrically distributed on the left and right sides of the back of the receiving box. By providing two fan cylinders and two built-in fans, the area missed during heat dissipation can be reduced, and the heat dissipation effect is good.

[0011] Preferably, the limiting slide rod is fixedly connected to the top of the second supporting L-shaped frame, the limiting slider is fixedly connected to the left side of the back side of the receiving box, and the limiting slider is slidably connected to the surface of the limiting slide rod. By setting the limiting slide rod and the limiting slider, a limiting function is played, and limiting can be performed to ensure that the threaded sleeve can slide along the surface of the threaded rod instead of idling, thereby ensuring the normal use of the heat dissipation device.

[0012] Preferably, the heat dissipation fins are arranged longitudinally at equal intervals on the back of the low-voltage inverter body. By providing the heat dissipation fins, heat can be conducted away, and the effect is better when used in conjunction with the heat dissipation structure.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The high-voltage integrated protector protects the low-voltage inverter. A transformer is installed on each phase of the inverter's main incoming line. The secondary line of the transformer is connected to the current input terminal of the high-voltage integrated protector to monitor the operating current of the two inverters. The maximum current of the full-load feeding amount is measured, and the measured maximum current 1.2 times zero seconds is used to realize the first-stage quick-break protection, and the measured maximum current 1.1 times 2 seconds is used to realize the second-stage overcurrent protection.

[0015] The high-voltage integrated protector protects the low-voltage inverter. By providing a heat dissipation device, the heat dissipation problem inside the low-voltage inverter body can be solved. The heat dissipation range can be increased by adjusting the height of the built-in fan to achieve a better heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional back structure of the utility model;

[0017] Figure 2 For this utility model Figure 1 The enlarged structural diagram at A in the middle;

[0018] Figure 3 This is a schematic diagram of the overall three-dimensional front view structure of the utility model;

[0019] Figure 4 This is the circuit diagram of the utility model Changyuan Shenrui high-voltage integrated protector;

[0020] Figure 5 This is a circuit diagram of a high voltage integrated protector protecting a low voltage inverter according to the utility model;

[0021] Figure 6 This is the main circuit diagram of the utility model.

[0022] In the figure: 1. low voltage inverter body; 2. mutual inductor; 3. heat dissipation device; 301. first supporting L-shaped frame; 302. drive motor; 303. threaded rod; 304. threaded sleeve; 305. connecting top plate; 306. fan cylinder; 307. built-in fan; 308. receiving box; 309. second supporting L-shaped frame; 310. limit sliding rod; 311. limit sliding block; 312. heat dissipation fins. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-6 , the utility model provides the following technical solutions:

[0025] A high-voltage integrated protector protects a low-voltage frequency converter, comprising a low-voltage frequency converter body 1, a mutual inductor 2 is arranged on the side of the low-voltage frequency converter body 1, and a heat dissipation device 3 is arranged on the back of the low-voltage frequency converter body 1.

[0026] The low-voltage inverter body 1 is internally provided with an inverter shutdown relay, an inverter incoming line circuit breaker, a current transformer and a high-voltage integrated protector. The inverter shutdown relay is electrically connected to the electric shock at the top of the high-voltage integrated protector. The high-voltage integrated protector is internally provided with a protective trip. The inverter incoming line circuit breaker and the current transformer are located in the main circuit, and the inverter incoming line circuit breaker is electrically connected to the current transformer. The inverter incoming line circuit breaker and the current transformer are connected in series.

[0027] The heat dissipation device 3 includes a first support L-shaped frame 301, a drive motor 302, a threaded rod 303, a threaded sleeve 304, a connecting top plate 305, a fan cylinder 306, a built-in fan 307, a receiving box 308, a second support L-shaped frame 309, a limit slide bar 310, a limit slide block 311 and a heat dissipation fin 312. The first support L-shaped frame 301 is fixedly connected to the right end of the back side of the low-voltage inverter body 1, the drive motor 302 is fixedly connected to the top of the first support L-shaped frame 301, the threaded rod 303 is fixedly connected to the output shaft of the drive motor 302, and the threaded rod 303 is fixedly connected to the output shaft of the drive motor 302. The threaded sleeve 304 is threadedly connected to the surface of the threaded rod 303, the connecting top plate 305 is fixedly connected to the side of the first supporting L-shaped frame 301, the receiving box 308 is fixedly connected to the front of the threaded sleeve 304, the fan cylinder 306 is fixedly connected to the back of the receiving box 308, the built-in fan 307 is fixedly connected to the inner wall of the fan cylinder 306, the second supporting L-shaped frame 309 is fixedly connected to the back of the low-voltage inverter body 1, the heat dissipation fins 312 are fixedly connected to the back of the low-voltage inverter body 1, and the heat dissipation fins 312 are evenly spaced and arranged longitudinally on the low-voltage inverter body 1 The back of the receiving box 308 is provided with a heat dissipation fin 312, which can conduct heat out. The heat dissipation structure is used to achieve a better effect. The back of the heat dissipation fin 312 is connected to the front of the receiving box 308. The front of the receiving box 308 is provided with a connecting air inlet slot. The bottom of the connecting top plate 305 is fixedly connected to a connecting bearing. The threaded rod 303 is fixedly connected to the inner ring of the connecting bearing. The number of the fan cylinder 306 and the built-in fan 307 are both two. The two fan cylinders 306 and the built-in fan 307 are symmetrically distributed on the left and right sides of the back of the receiving box 308. By providing two The fan barrel 306 and the built-in fan 307 can reduce the area missed during heat dissipation and have a good heat dissipation effect. The limiting slide bar 310 is fixedly connected to the top of the second supporting L-shaped frame 309, and the limiting slider 311 is fixedly connected to the left back side of the receiving box 308. The limiting slider 311 is slidably connected to the surface of the limiting slide bar 310. By setting the limiting slide bar 310 and the limiting slider 311, a limiting function is played, and limiting can be performed to ensure that the threaded sleeve 304 can slide along the surface of the threaded rod 303 instead of idling, thereby ensuring the normal use of the heat dissipation device 3.

[0028] When in use, a mutual inductor 2 is installed on each phase of the inverter main incoming line, and the two lines of the mutual inductor are connected to the current input terminal of the high-voltage integrated protector to realize the operating current monitoring of the two inverters. After measurement, the maximum current of the full-load feeding amount is obtained, and the measured maximum current 1.2 times zero seconds is used to realize the first stage of quick-break protection, and the measured maximum current 1.1 times 2 seconds is used to realize the second stage of overcurrent protection. When in use, it is necessary to deal with the heat dissipation problem inside the low-voltage inverter body 1. When in use, the heat dissipation fins 312 are used for heat conduction, and then the built-in fan 3 is used 07 for heat dissipation. During heat dissipation, the height of the built-in fan 307 can also be adjusted to increase the heat dissipation range. When in use, the drive motor 302 is started, and the output shaft of the drive motor 302 rotates to drive the threaded rod 303 to rotate, so that the threaded sleeve 304 can slide along the surface of the threaded rod 303, and the receiving box 308 is fixedly connected to the threaded sleeve 304, and the fan barrel 306 and the built-in fan 307 and other structures are placed on the receiving box 308, so they can move together, thereby increasing the heat dissipation range and achieving better heat dissipation effect.

[0029] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high voltage integrated protector for protecting a low voltage inverter, comprising a low voltage inverter body (1), characterized in that: A mutual inductor (2) is arranged on the side of the low-voltage frequency converter body (1), and a heat dissipation device (3) is arranged on the back of the low-voltage frequency converter body (1); The low-voltage inverter body (1) is provided with an inverter stop relay, an inverter incoming line circuit breaker, a current transformer and a high-voltage integrated protector. The inverter stop relay is electrically connected to the electric shock at the top of the high-voltage integrated protector. A protection trip is provided inside the high-voltage integrated protector. The inverter incoming line circuit breaker and the current transformer are located in the main circuit, and the inverter incoming line circuit breaker is electrically connected to the current transformer. The inverter incoming line circuit breaker and the current transformer are connected in series.

2. The high voltage integrated protector according to claim 1 is used to protect the low voltage inverter, characterized in that: The heat dissipation device (3) comprises a first support L-shaped frame (301), a drive motor (302), a threaded rod (303), a threaded sleeve (304), a connecting top plate (305), a fan cylinder (306), a built-in fan (307), a receiving box (308), a second support L-shaped frame (309), a limit sliding rod (310), a limit sliding block (311) and heat dissipation fins (312), wherein the first support L-shaped frame (301) is fixedly connected to the right end of the back side of the low-voltage inverter body (1), the drive motor (302) is fixedly connected to the top of the first support L-shaped frame (301), and the threaded rod (303) is fixedly connected to the drive motor (302). The output shaft of the motor (302) is connected to the threaded sleeve (304) by threading on the surface of the threaded rod (303); the connecting top plate (305) is fixedly connected to the side of the first supporting L-shaped frame (301); the receiving box (308) is fixedly connected to the front of the threaded sleeve (304); the fan cylinder (306) is fixedly connected to the back of the receiving box (308); the built-in fan (307) is fixedly connected to the inner wall of the fan cylinder (306); the second supporting L-shaped frame (309) is fixedly connected to the back of the low-voltage inverter body (1); and the heat dissipation fins (312) are fixedly connected to the back of the low-voltage inverter body (1).

3. The high voltage integrated protector according to claim 2 is used to protect the low voltage inverter, characterized in that: The back of the heat dissipation fin (312) is connected to the front of the receiving box (308), and the front of the receiving box (308) is provided with a connecting air inlet slot.

4. The high voltage integrated protector according to claim 2 is used to protect the low voltage inverter, characterized in that: A connecting bearing is fixedly connected to the bottom of the connecting top plate (305), and the threaded rod (303) is fixedly connected to the inner ring of the connecting bearing.

5. The high voltage integrated protector according to claim 2 is used to protect the low voltage inverter, characterized in that: The number of the fan cylinder (306) and the number of the built-in fan (307) are both two, and the two fan cylinders (306) and the two built-in fans (307) are symmetrically distributed on the left and right sides of the back of the receiving box (308).

6. The high voltage integrated protector according to claim 2 is used to protect the low voltage inverter, characterized in that: The limiting slide bar (310) is fixedly connected to the top of the second supporting L-shaped frame (309), the limiting slider (311) is fixedly connected to the left side of the back side of the receiving box (308), and the limiting slider (311) is slidably connected to the surface of the limiting slide bar (310).

7. The high voltage integrated protector according to claim 2 is used to protect the low voltage inverter, characterized in that: The heat dissipation fins (312) are arranged longitudinally at equal intervals on the back side of the low-voltage inverter body (1).

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