Power frequency and variable frequency switching high-voltage frequency converter

Abstract

The utility model discloses a power frequency and variable frequency switching high-voltage frequency converter, which comprises a frequency converter input switch, a frequency converter output switch, a frequency converter, a frequency converter bypass switch and a plug barrel, the frequency converter input switch is electrically connected with the input end of the frequency converter through a line, and the output end of the frequency converter is electrically connected with the frequency converter output switch through a line. A frequency converter bypass switch is connected between the frequency converter input switch and the frequency converter output switch in parallel, and two T-shaped limiting rods are fixedly installed on the inner wall of the plugging cylinder. The T-shaped rod is used for assisting in completing line connection, convenience and rapidness are achieved, meanwhile, the multiple ejector blocks are used for limiting bolts, bolt looseness caused by long-term vibration is avoided, and safe use of the high-frequency transformer is further guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of high-voltage frequency converters, and particularly to a high-voltage frequency converter for industrial-frequency and frequency-conversion switching. Background Technique

[0002] A high-voltage frequency converter is an efficient power conversion device used to regulate high-voltage power supplies and achieve smooth frequency and voltage adjustment. It is widely used in the industrial field, especially in industries such as power, energy, transportation, and the environment, which have high requirements for efficiency, energy conservation, and environmental protection. A high-voltage frequency converter is a frequency conversion device for alternating current motors that can adjust the alternating current voltage at the motor terminals from a higher input voltage to a lower output voltage to achieve energy conservation and improve the working efficiency of the motor.

[0003] In key and important processes that require equipment speed regulation during operation, the stability of the high-voltage frequency converter operation is crucial. The high-voltage frequency converter technology is mature and widely used in high-voltage motor speed regulation applications. Usually, when the output unit module fails during frequency conversion operation of the high-voltage frequency converter, it is a serious fault for the frequency converter and requires shutdown for processing. However, in continuous production sites or processes that require high-reliability operation, the frequency converter is not allowed to fail and shut down, otherwise it will cause production interruption and even trigger safety accidents.

[0004] At the same time, during installation, most of the existing conductive structures use a circular gasket, and a plug-in cylinder is installed on the outer wall of the gasket to plug in the circuit, thereby forming a conductive component. The conductive component can be tightened at the input end or output end of the control unit using bolts to complete the circuit. However, the existing conductive components are extremely vulnerable to vibration and are inconvenient for circuit plugging.

[0005] Therefore, there is a need for an automatic switching high-voltage frequency converter that can achieve frequency-conversion to industrial-frequency switching and facilitate circuit installation. Content of the Utility Model

[0006] The purpose of the utility model is to provide a high-voltage frequency converter for industrial-frequency and frequency-conversion switching.

[0007] The utility model is implemented by the following technical solutions:

[0008] A high-voltage frequency converter for industrial-frequency and frequency-conversion switching includes a frequency converter input switch, a frequency converter output switch, a frequency converter, a frequency converter bypass switch, and a plug-in cylinder. The frequency converter input switch is electrically connected to the input end of the frequency converter through a circuit, the output end of the frequency converter is electrically connected to the frequency converter output switch through a circuit, a frequency converter bypass switch is connected in parallel between the frequency converter input switch and the frequency converter output switch. Two T-shaped limit rods are fixedly installed on the inner wall of the plug-in cylinder, a compression spring is sleeved on each T-shaped limit rod, a T-shaped rod that is slidably connected is commonly sleeved between the two T-shaped rods, and a plug-in hole is provided on the T-shaped rod.

[0009] Preferably, one end of the insertion cylinder is fixedly connected with a conductive gasket. One end of the conductive gasket extends into the insertion cylinder and is arranged in contact with the T-shaped rod. A rubber extrusion block is fixedly installed at the top end of the conductive gasket. The rubber extrusion block is annular. An insulating cover is fixedly installed at the top end of the rubber extrusion block. The cross-section of the insulating cover is U-shaped. A plurality of top blocks are inserted on the outer wall of the insulating cover. A plurality of sliding grooves are arranged on the insulating cover. A return spring is arranged in each sliding groove. A slider is slidably connected in each sliding groove. The bottom end of each slider is fixedly connected with the top end of the top block respectively.

[0010] Advantages of the present utility model: By adding a group to the number of inverter output power units of the traditional high-voltage frequency converter and configuring a working-frequency conversion bypass configuration, the device ensures that the equipment operates without shutdown under normal conditions. The T-shaped rod is used to assist in completing the connection of the circuit. After the connection, the T-shaped rod can be directly released to complete the insertion of the circuit, which is convenient and fast. Then, it can be put into use after being wrapped with insulating tape. At the same time, a plurality of top blocks are used to limit the bolts, avoiding the loosening of the bolts caused by long-term vibration, and further ensuring the safe use of the high-frequency transformer. Description of the Drawings

[0011] Figure 1 is a top view schematic diagram of the structure of the present utility model;

[0012] Figure 2 is in the present utility model Figure 1 right view schematic diagram;

[0013] Figure 3 is a schematic diagram of the circuit connection of the present utility model.

[0014] In the figure: inverter input switch 1, inverter output switch 2, frequency converter 3, frequency converter bypass switch 4, insertion cylinder 5, T-shaped limit rod 6, compression spring 7, T-shaped rod 8, insertion hole 9, conductive gasket 10, rubber extrusion block 11, insulating cover 12, top block 13, sliding groove 14, return spring 15, slider 16. Detailed Embodiment

[0015] Such as Figures 1 to 3As shown in the figure, a frequency-conversion and power-frequency conversion high-voltage inverter includes an inverter input switch 1, an inverter output switch 2, an inverter 3, an inverter bypass switch 4, and a socket cylinder 5. The inverter input switch 1 is electrically connected to the input end of the inverter 3 through a line. The output end of the inverter 3 is electrically connected to the inverter output switch 2 through a line. An inverter bypass switch 4 is connected in parallel between the inverter input switch 1 and the inverter output switch 2. Two T-shaped limit rods 6 are fixedly installed on the inner wall of the socket cylinder 5. A compression spring 7 is sleeved on each T-shaped limit rod 6. A slidably connected T-shaped rod 8 is sleeved between the two T-shaped rods 6. A socket hole 9 is provided on the T-shaped rod 8. One more group is added to the number of inverter output power units in the traditional high-voltage inverter, that is, the final number of units is 27. Then, through the configuration of the frequency-conversion and power-frequency conversion bypass configuration, the equipment can operate without downtime under normal conditions, and the number of inverter output power unit groups of the high-voltage inverter is increased. The conventional high-voltage inverter has 8 groups of inverter output power units (3 in each group). In order to improve the operation stability of the inverter, the number of inverter output power units is increased to 9 groups. At the same time, through software algorithms, when a bypass failure occurs in a certain unit, it is automatically cut off. Relying on the remaining power units, the high-voltage inverter can continue to operate without derating. The high-voltage inverter adds a power-frequency bypass function. When the number of faulty inverter output power units exceeds 3, in order to ensure that the equipment does not stop running, the working mode is changed from frequency conversion to power frequency. When the equipment is operating at power frequency, the maintenance of the inverter output power units of the inverter can be completed. After the maintenance is completed, the mode is switched from the power-frequency mode to the frequency-conversion mode to realize the frequency-conversion operation of the equipment. Through this transformation, theoretically, after the inverter has 3 failures of the inverter output power units, its functions and performance are the same as those of the traditional high-voltage inverter, and there is a large margin of space, ensuring that it can operate reliably within a maintenance cycle. Compared with the traditional high-voltage inverter, this transformation combines multiple inverter output power units and frequency-conversion and power-frequency conversion bypasses, allowing no less than 3 failures of the inverter output power units, and the equipment can still continue to operate.

[0016] When inserting the line, directly pull the T-shaped rod 8 to compress the compression spring 7. Then, pass the copper wire part of the cable through the socket hole 9 and then wind and tighten them. After loosening the T-shaped rod 8, it will reset under the action of the elastic force, and then wrap it with insulating tape and it can be put into use. The operation is simple and convenient, which can effectively improve the installation efficiency.

[0017] One end of the insertion cylinder 5 is fixedly connected with a conductive gasket 10. One end of the conductive gasket 10 extends into the insertion cylinder 5 and is arranged in contact with the T-shaped rod 8. A rubber extrusion block 11 is fixedly installed at the top end of the conductive gasket 10. The rubber extrusion block 11 is annular. An insulating cover 12 is fixedly installed at the top end of the rubber extrusion block 11. The cross-section of the insulating cover 12 is U-shaped. A plurality of top blocks 13 are inserted on the outer wall of the insulating cover 12. A plurality of sliding grooves 14 are arranged on the insulating cover 12. A return spring 15 is arranged in each sliding groove 14. A slider 16 is slidably connected in each sliding groove 14. The bottom end of each slider 16 is fixedly connected with the top end of the corresponding top block 13. A plurality of top blocks 13 are provided. When the bolt is tightened, the top of the top block 13 is arc-shaped, so that it will not affect the normal descent of the bolt. After the bolt is tightened, the plurality of top blocks 13 are reset under the action of the return spring 15, so as to limit the top of the bolt, thereby realizing pressing, avoiding the influence of loosening of the bolt caused by vibration, and strengthening the safe use of the frequency converter.

[0018] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A frequency-conversion and power-frequency switching high-voltage inverter, characterized in that: It includes an inverter input switch, an inverter output switch, an inverter, an inverter bypass switch and a plug-in cylinder. The inverter input switch is electrically connected to the input end of the inverter through a line. The output end of the inverter is electrically connected to the inverter output switch through a line. The inverter bypass switch is connected in parallel between the inverter input switch and the inverter output switch. Two T-shaped limit rods are fixedly installed on the inner wall of the plug-in cylinder. A compression spring is sleeved on each T-shaped limit rod. A T-shaped rod connected in a sliding manner is sleeved between the two T-shaped rods. A plug-in hole is provided on the T-shaped rod.

2. The variable-frequency and power-frequency switching high-voltage inverter according to claim 1, wherein: One end of the plug-in cylinder is fixedly connected with a conductive gasket. One end of the conductive gasket extends into the plug-in cylinder and is arranged in contact with the T-shaped rod. A rubber extrusion block is fixedly installed at the top of the conductive gasket. The rubber extrusion block is annular. An insulating cover is fixedly installed at the top of the rubber extrusion block. The cross section of the insulating cover is U-shaped. A plurality of top blocks are inserted into the outer wall of the insulating cover. A plurality of sliding grooves are provided on the insulating cover. A return spring is arranged in each sliding groove. A slider is slidably connected in each sliding groove. The bottom end of each slider is fixedly connected to the top end of the corresponding top block.

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