A three-level inverter with safety protection structure

Abstract

The present invention discloses a three-level inverter with a safety protection structure, including a safety protection structure and an inverter body, wherein the safety protection structure includes a first end seat and a second end seat, wherein a base is disposed at the bottom of each of the first end seat and the second end seat, wherein each of the first end seat and the second end seat is in a circular ring structure, and wherein a movable rail is disposed at the outer edge of each of the first end seat and the second end seat, wherein a tooth groove is disposed on the movable rail, wherein each of the first end seat and the second end seat is internally provided with a shock absorbing frame, and wherein the inverter body is installed between the two shock absorbing frames. The present invention can solve the problem that the safety protection performance of the existing three-level inverter equipped with a safety protection structure is insufficient, and the problems of stability performance, shock resistance and drop resistance are insufficient, and the three-level inverter internal components cannot be promptly processed when a fire occurs due to a short circuit, excessive temperature or other reasons, which often leads to more serious losses.

Description

Technical Field

[0001] The invention relates to the field of inverters, and in particular to a three-level inverter with a safety protection structure. Background Art

[0002] Recently, with the rapid development of high voltage technology and its increasing application scope in the field of industrial control, high voltage IGBT devices and IGCT devices have expanded their application fields. The voltage output by the two-level inverter is only (-V, +V) two levels. For this inverter structure, the harmonic components in the inverter output current are usually reduced by increasing the switching frequency of the switching devices in the inverter. However, in the actual application of high voltage and high power industries, the switching frequency of the power devices used must be limited to below IKHz. Therefore, multi-level inverters are born, including three-level inverters. Multi-level inverters are often equipped with safety protection structures, external protection or external protection. However, the existing three-level inverters equipped with safety protection structures still have certain defects when used. First of all, the safety protection performance of the safety protection structure is insufficient, whether it is stable performance or shock and fall resistance. It is not possible to deal with the fire of the internal components of the three-level inverter due to short circuit, high temperature or other reasons in time, which often leads to more serious losses.

[0003] The patent with publication number: CN202310390U discloses a protection structure and an inverter including the protection structure. Compared with the present application, the patent cannot solve the problem proposed by the present application: the existing three-level inverter equipped with a safety protection structure has insufficient safety protection performance, both in terms of stability performance and shock and drop resistance. In addition, it is unable to promptly handle the situation when the internal components of the three-level inverter catch fire due to short circuit, overtemperature or other reasons, which often leads to more serious losses. Summary of the invention

[0004] The purpose of the present invention is to provide a three-level inverter with a safety protection structure, which can solve the problem that the existing three-level inverter equipped with a safety protection structure has insufficient safety protection performance, such as insufficient stability performance and shock and drop resistance, and cannot promptly handle the situation when the internal components of the three-level inverter catch fire due to short circuit, overtemperature or other reasons, which often leads to more serious losses.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A three-level inverter with a safety protection structure, comprising a safety protection structure and an inverter body, wherein the safety protection structure comprises a first end seat and a second end seat, wherein a base is disposed at the bottom of each of the first end seat and the second end seat, wherein each of the first end seat and the second end seat is in a circular ring structure, and a movable rail is disposed at the outer edge of each of the first end seat and the second end seat, wherein a tooth groove is disposed on the movable rail, wherein each of the first end seat and the second end seat is internally provided with a shock absorbing frame, wherein the inverter body is installed between the two shock absorbing frames, wherein the outer walls of the three sides of the shock absorbing frame are provided with a plurality of evenly distributed springs, wherein a movable bottom plate located at the bottom of the inverter body is installed between the two shock absorbing frames, wherein two brackets are disposed between the first end seat and the second end seat, wherein two carbon dioxide fire extinguisher boxes are fixed on the top of each of the two brackets, and wherein each of the carbon dioxide fire extinguisher boxes is against the outer wall of the inverter body;

[0007] A solenoid valve is connected to the pipe between the two carbon dioxide fire extinguisher boxes on the same bracket, and a row of nozzles are arranged on the side walls of all carbon dioxide fire extinguisher boxes that are in contact with the inverter body, and the nozzles are connected to the interior of the carbon dioxide fire extinguisher box through the connection holes on the outer wall of the carbon dioxide fire extinguisher box;

[0008] A motor is installed on each of the two bases, and the output shaft of the motor is connected to the reducer located on the base. The transmission shaft connected to the output end of the reducer is directly connected to the rotating gear located on the support seat. The support seat is fixed on the base, and the rotating gear is embedded in the tooth groove and meshes with the tooth marks inside the tooth groove. A bracket is also provided on the top of the base. The bracket and the support seat are located on the same horizontal line, and an inclined wheel disc is fixed on the top of the bracket. An auxiliary gear is installed on the top and bottom of the wheel disc, and the two auxiliary gears are embedded in the tooth groove and meshed with the tooth marks inside the tooth groove.

[0009] Preferably, the spring on the outer wall of the shock absorbing frame inside the first end seat abuts against the inner wall of the first end seat, and the spring on the outer wall of the shock absorbing frame inside the second end seat abuts against the inner wall of the second end seat.

[0010] Preferably, the motor is connected through a speed reducer, a transmission shaft and a rotating gear.

[0011] Preferably, the first end seat and the second end seat are rotatably connected to the base through rotating gears and auxiliary gears at their bottoms.

[0012] Preferably, all nozzles on the same carbon dioxide fire extinguisher housing are connected via a connecting pipe, and the connecting pipe is connected to the solenoid valve via a delivery pipe.

[0013] Preferably, a temperature detector for detecting the internal temperature is installed inside the inverter body, and the temperature detector and the solenoid valve are electrically connected to the control element inside the inverter body.

[0014] Preferably, the method for using the three-level inverter with a safety protection structure specifically comprises the following steps:

[0015] Step 1: Perform external protection. When the entire three-level inverter encounters a collision or falls, the inverter body is shock-absorbing and buffered by a shock-absorbing frame and springs. Four carbon dioxide fire extinguisher boxes fix the inverter body from both sides to provide external protection for the three-level inverter.

[0016] Step 2: Perform internal protection. When the temperature inside the inverter exceeds the preset standard, the temperature detector detects that the temperature exceeds the standard and transmits the exceeding standard signal to the control element inside the inverter. The control element directly controls the solenoid valve to open. All carbon dioxide fire extinguisher boxes start to operate, and carbon dioxide is transmitted through the solenoid valve and the delivery pipe, and sprayed into the inverter from the nozzle to achieve the effect of cooling and extinguishing the fire.

[0017] Step 3: When the internal components of the inverter body are damaged and need to be repaired and replaced, start the motor. The power of the motor is transmitted to the rotating gear through the reducer. The rotating gear corresponding to the first end seat cooperates with the auxiliary gear to drive the first end seat to rotate during the rotation process. The rotating gear corresponding to the second end seat cooperates with the auxiliary gear to drive the second end seat to rotate during the rotation process, thereby flipping the inverter body to a state with the bottom tilted upward. At this time, the internal components of the inverter body can be directly repaired and replaced by pulling out the movable bottom plate.

[0018] The beneficial effects of the present invention are:

[0019] The inverter body is protected by setting a safety protection structure. The protection is mainly divided into internal protection and external protection. The external protection is due to the existence of the first end seat and the second end seat, and a shock absorbing frame is arranged inside the first end seat and the second end seat. A number of evenly distributed springs are arranged on the three side outer walls of the shock absorbing frame, so that the two ends of the inverter body can be fixed by the shock absorbing frame. The existence of the springs can prevent damage even if the entire three-level inverter encounters a collision or falls due to the shock absorbing and buffering effect of the shock absorbing frame and the springs;

[0020] Due to the presence of four carbon dioxide fire extinguisher boxes, each carbon dioxide fire extinguisher box is against the outer wall of the inverter body, so that the inverter body can be fixed from both sides by the four carbon dioxide fire extinguisher boxes, thereby effectively ensuring stability, so that the carbon dioxide fire extinguisher box can realize external protection of the inverter body, and the pipe between the two carbon dioxide fire extinguisher boxes located on the same bracket is connected with a solenoid valve, and a row of nozzles are arranged on the side walls of all carbon dioxide fire extinguisher boxes that are in contact with the inverter body, and the nozzles are connected to the interior of the carbon dioxide fire extinguisher box through the connection holes on the outer wall of the carbon dioxide fire extinguisher box. At the same time, a temperature detector for internal temperature detection is installed inside the inverter body. The temperature detector The temperature detector and the solenoid valve are electrically connected to the control element inside the inverter body, so that the temperature inside the inverter body can be monitored in real time through the temperature detector. When the temperature inside the inverter body exceeds the preset standard, the control element directly controls the solenoid valve to open, and all carbon dioxide fire extinguisher boxes start to operate, and transmit carbon dioxide through the solenoid valve and the delivery pipe, and spray it into the inverter body from the nozzle to achieve the effect of cooling and extinguishing the fire, and play the role of internal protection to avoid the dangerous situation of fire in the components inside the inverter body due to excessive temperature, thereby effectively avoiding more serious losses, realizing the internal protection function of the inverter body, and having the function of timely handling of emergency situations;

[0021] Due to the presence of the rotating gear and the auxiliary gear on the base, and a movable rail is provided at the outer edge of the first end seat and the second end seat, the rotating gear, the auxiliary gear and the movable rail are adapted to each other. At the same time, since a movable and detachable movable bottom plate is installed at the bottom of the inverter body, when the internal components of the inverter body are damaged and need to be repaired and replaced, there is no need to remove the outer shell of the inverter body. Only the motor needs to be started, and the power of the motor is transmitted to the rotating gear through the reducer. The rotating gear corresponding to the first end seat cooperates with the auxiliary gear to drive the first end seat to rotate during the rotation process, and the rotating gear corresponding to the second end seat cooperates with the auxiliary gear to drive the second end seat to rotate during the rotation process, so that the inverter body can be flipped to a state where the bottom is tilted upward. At this time, the internal components of the inverter body can be directly repaired and replaced by pulling out the movable bottom plate, which is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the safety protection structure of the present invention;

[0025] Figure 3A top view of the present invention;

[0026] Figure 4 For the present invention Figure 2 A detailed enlarged view of area A;

[0027] Figure 5 For the present invention Figure 2 Detailed enlarged view of area B in the figure;

[0028] In the figure: 1. first end seat; 2. second end seat; 3. bracket; 4. carbon dioxide fire extinguisher housing; 5. solenoid valve; 6. shock absorbing frame; 7. inverter body; 8. spring; 9. base; 10. movable bottom plate; 11. delivery pipe; 12. nozzle; 13. bracket; 14. wheel; 15. auxiliary gear; 16. motor; 17. output shaft; 18. reducer; 19. transmission shaft; 20. support seat; 21. rotating gear; 22. tooth groove; 23. movable rail. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-5 As shown, a three-level inverter with a safety protection structure includes a safety protection structure and an inverter body 7, the safety protection structure includes a first end seat 1 and a second end seat 2, a base 9 is arranged at the bottom of the first end seat 1 and the second end seat 2, the first end seat 1 and the second end seat 2 are both in a circular ring structure, and a movable rail 23 is arranged at the outer edge of the first end seat 1 and the second end seat 2, and a tooth groove 22 is arranged on the movable rail 23, a shock absorbing frame 6 is arranged inside the first end seat 1 and the second end seat 2, the inverter body 7 is installed between the two shock absorbing frames 6, and the three side outer walls of the shock absorbing frame 6 are provided with a plurality of evenly distributed springs 8, a movable bottom plate 10 located at the bottom of the inverter body 7 is installed between the two shock absorbing frames 6, and two brackets 3 are arranged between the first end seat 1 and the second end seat 2, and two carbon dioxide fire extinguisher boxes 4 are fixed on the top of each of the two brackets 3, and each carbon dioxide fire extinguisher box 4 is against the outer wall of the inverter body 7;

[0031] A solenoid valve 5 is connected to the pipe between two carbon dioxide fire extinguisher boxes 4 located on the same bracket 3, and a row of nozzles 12 are arranged on the side walls of all carbon dioxide fire extinguisher boxes 4 that are in contact with the inverter body 7, and the nozzles 12 are connected to the interior of the carbon dioxide fire extinguisher box 4 through the connection holes on the outer wall of the carbon dioxide fire extinguisher box 4;

[0032] A motor 16 is installed on each of the two bases 9. The output shaft 17 of the motor 16 is connected to the reducer 18 located on the base 9. The transmission shaft 19 connected to the output end of the reducer 18 is directly connected to the rotating gear 21 located on the support 20. The support 20 is fixed on the base 9. The rotating gear 21 is embedded in the tooth groove 22 and meshes with the tooth marks inside the tooth groove 22. A bracket 13 is also provided on the top of the base 9. The bracket 13 and the support 20 are located on the same horizontal straight line, and an inclined wheel disc 14 is fixed on the top of the bracket 13. An auxiliary gear 15 is installed on the top and bottom of the wheel disc 14, and the two auxiliary gears 15 are embedded in the tooth groove 22 and mesh with the tooth marks inside the tooth groove 22.

[0033] The spring 8 on the outer wall of the shock absorbing frame 6 inside the first end seat 1 abuts against the inner wall of the first end seat 1 , and the spring 8 on the outer wall of the shock absorbing frame 6 inside the second end seat 2 abuts against the inner wall of the second end seat 2 .

[0034] The motor 16 is connected to the rotating gear 21 through the reducer 18 and the transmission shaft 19 .

[0035] The first end seat 1 and the second end seat 2 are rotationally connected to the base 9 through the rotating gears 21 and the auxiliary gears 15 at their bottoms.

[0036] All the nozzles 12 on the same carbon dioxide fire extinguisher housing 4 are connected via a connecting pipe, and the connecting pipe is connected to the solenoid valve 5 via a delivery pipe 11 .

[0037] A temperature detector for internal temperature detection is installed inside the inverter body 7. The temperature detector and the solenoid valve 5 are electrically connected to the control element inside the inverter body 7. The temperature detector can monitor the temperature inside the inverter body 7 in real time, and feed back the temperature signal to the control element inside the inverter body 7, i.e., the controller, for control.

[0038] The method for using the three-level inverter with a safety protection structure specifically comprises the following steps:

[0039] Step 1: Perform external protection. When the entire three-level inverter encounters a collision or falls, the inverter body 7 is shock-absorbed and buffered by the shock-absorbing frame 6 and the spring 8. Four carbon dioxide fire extinguisher boxes 4 fix the inverter body 7 from both sides to provide external protection for the three-level inverter.

[0040] Step 2: Perform internal protection. When the temperature inside the inverter body 7 exceeds the preset standard, the temperature detector detects that the temperature exceeds the standard and transmits the exceeding standard signal to the control element inside the inverter body 7. The control element directly controls the solenoid valve 5 to open, and all the carbon dioxide fire extinguisher boxes 4 start to operate, and transmit carbon dioxide through the solenoid valve 5 and the delivery pipe 11, and spray into the interior of the inverter body 7 from the nozzle 12, so as to achieve the effect of cooling and extinguishing the fire;

[0041] Step three: When the internal components of the inverter body 7 are damaged and need to be repaired and replaced, start the motor 16. The power of the motor 16 is transmitted to the rotating gear 21 through the reducer 18. The rotating gear 21 corresponding to the first end seat 1 cooperates with the auxiliary gear 15 to drive the first end seat 1 to rotate during the rotation. The rotating gear 21 corresponding to the second end seat 2 cooperates with the auxiliary gear 15 to drive the second end seat 2 to rotate during the rotation, thereby flipping the inverter body 7 to a state with the bottom tilted upward. At this time, the movable bottom plate 10 can be pulled out to directly repair and replace the internal components of the inverter body 7.

[0042] When the present invention is in use, a safety protection structure is used to protect the inverter body 7. The protection is mainly divided into internal protection and external protection. The external protection is due to the existence of the first end seat 1 and the second end seat 2. A shock absorbing frame 6 is arranged inside the first end seat 1 and the second end seat 2. A plurality of evenly distributed springs 8 are arranged on the three side outer walls of the shock absorbing frame 6, so that the two ends of the inverter body 7 can be fixed by the shock absorbing frame 6. The existence of the spring 8 can prevent damage due to the shock absorbing and buffering effect of the shock absorbing frame 6 and the spring 8 even if the entire three-level inverter encounters a collision or falls. In addition, due to the existence of four carbon dioxide fire extinguisher boxes 4, each carbon dioxide fire extinguisher box 4 is against the outer wall of the inverter body 7, so that The inverter body 7 can be fixed from both sides by four carbon dioxide fire extinguisher boxes 4, so as to effectively ensure stability. Due to the presence of the carbon dioxide fire extinguisher boxes 4, the two carbon dioxide fire extinguisher boxes 4 located on the same bracket 3 are connected by a pipeline with a solenoid valve 5, and all the carbon dioxide fire extinguisher boxes 4 are provided with a row of nozzles 12 on the side walls in contact with the inverter body 7, and the nozzles 12 are connected to the inside of the carbon dioxide fire extinguisher box 4 through the connection holes on the outer wall of the carbon dioxide fire extinguisher box 4. At the same time, a temperature detector (model: TM-902C) for internal temperature detection is installed inside the inverter body 7. The temperature detector and the solenoid valve 5 are electrically connected to the control element inside the inverter body 7, so that the temperature inside the inverter body 7 is The temperature can be monitored in real time by the temperature detector, so that when the internal temperature of the inverter body 7 exceeds the preset standard, the control element directly controls the solenoid valve 5 to open, and all the carbon dioxide fire extinguisher boxes 4 start to operate, and transmit carbon dioxide through the solenoid valve 5 and the delivery pipe 11, and spray it into the interior of the inverter body 7 from the nozzle 12, so as to achieve the effect of cooling and extinguishing the fire, and play the role of internal protection to avoid the dangerous situation of fire caused by excessive temperature of the internal components of the inverter body 7, thereby effectively avoiding more serious losses; due to the existence of the rotating gear 21 and the auxiliary gear 15 on the base 9, and the outer edges of the first end seat 1 and the second end seat 2 are provided with a movable rail 23, the rotating gear 21, the auxiliary gear 15 and the movable rail are adapted to At the same time, since a movable and detachable movable bottom plate 10 is installed at the bottom of the inverter body 7, when the internal components of the inverter body 7 are damaged and need to be repaired and replaced, there is no need to remove the casing of the inverter body 7. Just start the motor 16. The power of the motor 16 is transmitted to the rotating gear 21 through the reducer 18. The rotating gear 21 corresponding to the first end seat 1 cooperates with the auxiliary gear 15 to drive the first end seat 1 to rotate during the rotation process. The rotating gear 21 corresponding to the second end seat 2 cooperates with the auxiliary gear 15 to drive the second end seat 2 to rotate during the rotation process, so that the inverter body 7 can be flipped to a state with the bottom tilted upward. At this time, the internal components of the inverter body 7 can be directly repaired and replaced by pulling out the movable bottom plate 10, which is more convenient.

[0043] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A three-level inverter with a safety protection structure, comprising a safety protection structure and an inverter body (7), It is characterized in that The safety protection structure comprises a first end seat (1) and a second end seat (2), wherein a base (9) is disposed at the bottom of each of the first end seat (1) and the second end seat (2), wherein each of the first end seat (1) and the second end seat (2) is in a circular ring structure, and a movable rail (23) is disposed at the outer edge of each of the first end seat (1) and the second end seat (2), wherein a tooth groove (22) is disposed on the movable rail (23), and a shock absorbing frame (6) is disposed inside each of the first end seat (1) and the second end seat (2), wherein the inverter body (7) is mounted between the two shock absorbing frames (6), and wherein the shock absorbing frame (6) is provided with a plurality of evenly distributed outer walls on three sides thereof. A spring (8) of cloth, a spring (8) on the outer wall of the shock absorbing frame (6) inside the first end seat (1) abuts against the inner wall of the first end seat (1), and a spring (8) on the outer wall of the shock absorbing frame (6) inside the second end seat (2) abuts against the inner wall of the second end seat (2), a movable bottom plate (10) located at the bottom of the inverter body (7) is installed between the two shock absorbing frames (6), two brackets (3) are arranged between the first end seat (1) and the second end seat (2), two carbon dioxide fire extinguisher boxes (4) are fixed on the top of each of the two brackets (3), and each of the carbon dioxide fire extinguisher boxes (4) abuts against the outer wall of the inverter body (7); A solenoid valve (5) is connected to a pipeline between two carbon dioxide fire extinguisher boxes (4) located on the same bracket (3); a temperature detector for detecting the internal temperature is installed inside the inverter body (7); the temperature detector and the solenoid valve (5) are electrically connected to the control element inside the inverter body (7); and a row of nozzles (12) are arranged on the side walls of all carbon dioxide fire extinguisher boxes (4) in contact with the inverter body (7); and the nozzles (12) are connected to the interior of the carbon dioxide fire extinguisher box (4) through the connection holes on the outer wall of the carbon dioxide fire extinguisher box (4); A motor (16) is mounted on each of the two bases (9); an output shaft (17) of the motor (16) is connected to a reducer (18) located on the base (9); a transmission shaft (19) connected to the output end of the reducer (18) is directly connected to a rotating gear (21) located on a support base (20); the motor (16) is connected to the rotating gear (21) through the transmission between the reducer (18), the transmission shaft (19) and the rotating gear (21); the support base (20) is fixed on the base (9); and the rotating gear (21) is connected to the rotating gear (21) through the transmission between the reducer (18) and the transmission shaft (19); The support base (20) is embedded in the tooth groove (22) and meshes with the tooth marks inside the tooth groove (22). A bracket (13) is also provided on the top of the base (9). The bracket (13) and the support base (20) are located on the same horizontal line. An inclined wheel disc (14) is fixed on the top of the bracket (13). An auxiliary gear (15) is installed on the top and bottom of the wheel disc (14). The two auxiliary gears (15) are embedded in the tooth groove (22) and mesh with the tooth marks inside the tooth groove (22). The method for using the three-level inverter with a safety protection structure specifically comprises the following steps: Step 1: Perform external protection. When the entire three-level inverter encounters a collision or falls, the inverter body (7) is shock-absorbing and buffered by a shock-absorbing frame (6) and a spring (8). Four carbon dioxide fire extinguisher boxes (4) fix the inverter body (7) from both sides to provide external protection for the three-level inverter. Step 2: Perform internal protection. When the temperature inside the inverter body (7) exceeds a preset standard, the temperature detector detects that the temperature exceeds the standard and transmits an exceeding standard signal to the control element inside the inverter body (7). The control element directly controls the solenoid valve (5) to open, and all the carbon dioxide fire extinguisher boxes (4) start to operate. Carbon dioxide is transmitted through the solenoid valve (5) and the delivery pipe (11) and sprayed from the nozzle (12) into the interior of the inverter body (7) to achieve the effect of cooling and extinguishing the fire. All the nozzles (12) on the same carbon dioxide fire extinguisher box (4) are connected by a connecting pipe, and the connecting pipe is connected to the solenoid valve (5) through the delivery pipe (11); Step 3: When the internal components of the inverter body (7) are damaged and need to be repaired and replaced, the motor (16) is started. The power of the motor (16) is transmitted to the rotating gear (21) through the reducer (18). The rotating gear (21) corresponding to the first end seat (1) cooperates with the auxiliary gear (15) during the rotation process to drive the first end seat (1) to rotate. The first end seat (1) and the second end seat (2) are rotationally connected through the rotating gear (21) and the auxiliary gear (15) at the bottom of each end seat and the base (9). The rotating gear (21) corresponding to the second end seat (2) cooperates with the auxiliary gear (15) during the rotation process to drive the second end seat (2) to rotate, thereby turning the inverter body (7) into a state with the bottom tilted upward. At this time, the movable bottom plate (10) can be pulled out to directly repair and replace the internal components of the inverter body (7).

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