Isolation-switch-free one-driving-one automatic switching cabinet of high-voltage frequency converter

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By designing a high-voltage inverter without isolation switch, one-to-one automatic switching cabinet, the switching control of power and frequency conversion is achieved by using vacuum contactors and insulators, the problem of large space and low utilization in the existing technology is solved, and the problem of isolation switches occupying a large space and low usage rate is achieved. Small size and lower cost automatic switching cabinet.

CN222441579UActive Publication Date: 2025-02-07XINFENGGUANG ELECTRONICS TECH CO LTD

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Patent Information

Application Number: CN202420151705.2
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-01-22
Publication Date: 2025-02-07
Estimated Expiration: 2034-01-22

AI Technical Summary

Technical Problem

The existing frequency converter automatic switching cabinet is equipped with input and output isolating switches, which leads to large size, high cost and large space occupancy, and the usage rate of the isolating switch is extremely low.

Method used

Design a high-voltage inverter without isolating switch, one-to-one automatic switching cabinet, and use input vacuum contactor, bypass vacuum contactor and output vacuum contactor, combined with input and output insulators, to realize the power frequency and frequency conversion of the load motor. between conversion control.

Benefits of technology

The switching control between the power frequency and frequency conversion of the load motor is realized. At the same time, due to the omission of the isolation switch, the devices in the cabinet are reduced, the volume of the switching cabinet is reduced and the production cost is reduced.

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Abstract

The isolation switch-free one-to-one automatic switching cabinet comprises a cabinet body, and an input vacuum contactor, a bypass vacuum contactor and an output vacuum contactor which are fixed in the cabinet body, and is characterized in that no isolation switch is arranged in the cabinet body; an input insulator and an output insulator are fixed in the cabinet body; the input vacuum contactor is connected with the bypass vacuum contactor through a first connecting copper bar and a second connecting copper bar, and the bypass vacuum contactor is connected with the output insulator through a third connecting copper bar and a fourth connecting copper bar; and the input and output vacuum contactors are connected with the input and output ends of the frequency converter. The automatic switching cabinet provided by the utility model not only realizes switching control between power frequency and frequency conversion of the load motor, but also reduces devices in the cabinet body and effectively reduces the volume and manufacturing cost of the switching cabinet because the cabinet body is not provided with an isolating switch, thereby being more suitable for application.

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Description

Technical Field

[0001] The utility model relates to an automatic switching cabinet, and more specifically, to a high-voltage frequency converter one-to-one automatic switching cabinet without an isolating switch. Background Art

[0002] At present, in the application of frequency converters, the main circuit of the frequency converter's automatic switching cabinet is equipped with an input isolating switch and an output isolating switch to achieve electrical isolation between the input and output ends of the frequency converter. The input and output isolating switches are usually composed of static contacts, moving contacts and operating handles, which results in a large size of the isolating switch. If a large isolating switch is set in the frequency converter's automatic switching cabinet, this will inevitably lead to a large size of the frequency converter's automatic switching cabinet.

[0003] However, in the actual operation of the automatic switching cabinet of the frequency converter, the actual utilization rate of the isolating switch is extremely low, that is, the isolating switch is usually always in the closed state. Therefore, the automatic switching cabinet equipped with input and output isolating switches is not only large in size and high in cost, but also requires a large installation space, which is somewhat wasteful in terms of function and economy. If the input and output isolating switches in the automatic switching cabinet can be omitted, it will undoubtedly reduce the switching cabinet components, reduce the cabinet size and save costs. Summary of the invention

[0004] In order to overcome the disadvantages of the above technical problems, the utility model provides a high-voltage frequency converter one-to-one automatic switching cabinet without isolating switch.

[0005] The utility model discloses a high-voltage frequency converter one-to-one automatic switching cabinet without an isolating switch, comprising a cabinet body and an input vacuum contactor, a bypass vacuum contactor and an output vacuum contactor fixed in the cabinet body, a front cabinet door, a rear cabinet door and a side cabinet door are respectively arranged on the front, rear and two side surfaces of the cabinet body, and a bottom threading hole is arranged at the bottom of the cabinet body; the utility model is characterized in that: the cabinet body is not provided with an isolating switch; the cabinet body is respectively fixed with an input insulator and an output insulator at positions close to the input vacuum contactor and close to the output vacuum contactor;

[0006] The lower terminal or upper terminal of the input vacuum contactor is connected to the input insulator via the first connecting copper bar, the input insulator is connected to the upper terminal or lower terminal of the bypass vacuum contactor via the second connecting copper bar, the terminal on the bypass vacuum contactor not connected to the input insulator is connected to the output insulator via the third connecting copper bar, and the upper terminal or lower terminal of the output vacuum contactor is connected to the output insulator via the fourth connecting copper bar; the terminal on the input vacuum contactor not connected to the input insulator is connected to the input end of the inverter via a cable passing through the bottom threading hole, and the terminal on the output vacuum contactor not connected to the output insulator is connected to the output end of the inverter via a cable passing through the bottom threading hole.

[0007] The utility model discloses a high-voltage frequency converter one-to-one automatic switching cabinet without an isolating switch. A controller installation box is arranged on the front door of the cabinet body, a controller is fixed in the controller installation box, and a ventilation window is fixed on the outer side of the controller installation box.

[0008] The utility model discloses a high-voltage frequency converter non-isolating switch one-to-one automatic switching cabinet, wherein a forklift hole is provided at the bottom of the cabinet, and lifting rings are fixed on the four corners of the top of the cabinet.

[0009] The utility model discloses a high-voltage frequency converter non-isolating switch one-to-one automatic switching cabinet, wherein the upper surface of the cabinet body is provided with a top threading hole for replacing the bottom threading hole.

[0010] The utility model discloses a one-to-one automatic switching cabinet for a high-voltage frequency converter without an isolating switch. The front cabinet door of the cabinet is provided with a display screen installation slot and an indicator light installation hole.

[0011] The utility model discloses a one-to-one automatic switching cabinet for a high-voltage frequency converter without an isolating switch. The columns on both sides of the cabinet are provided with assembly holes for assembly with other cabinets.

[0012] The beneficial effects of the utility model are as follows: the high-voltage frequency converter of the utility model has no isolating switch and one-to-one automatic switching cabinet, which is composed of a cabinet and input, output and bypass vacuum contactors and output and output insulators arranged in the cabinet, one end of the input vacuum contactor is connected to the input end of the frequency converter, and the other end is connected to one end of the bypass vacuum contactor, one end of the output vacuum contactor is connected to the output end of the frequency converter, and the other end is connected to the other end of the bypass vacuum contactor; if the load motor needs to be frequency-controlled, the input and output vacuum contactors are closed, and the bypass vacuum contactor is disconnected at the same time to realize the frequency-controlled load motor, when the power frequency control is required, the bypass vacuum contactor is closed, and the input and output vacuum contactors are disconnected at the same time to realize the power frequency control of the load motor, so that the conversion control between the power frequency and the frequency conversion of the load motor is realized. At the same time, since there is no isolating switch in the cabinet, not only the components in the cabinet are reduced, but also the volume and production cost of the switching cabinet are effectively reduced, which is more suitable for application.

[0013] Furthermore, by opening a forklift hole at the bottom of the cabinet and providing a lifting ring at the top of the cabinet, the transportation and lifting of the switching cabinet are facilitated; by opening an assembly hole on the column on the side of the cabinet, it is convenient to assemble the switching cabinet with other cabinets; by opening a top threading hole on the top of the cabinet, when it is inconvenient to run the wires from the bottom of the cabinet, the wires can also be run from the upper part of the cabinet, making the switching cabinet more adaptable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a front view of Example 1 of a one-to-one automatic switching cabinet without an isolating switch of the utility model;

[0015] Figure 2 It is a left view of Embodiment 1 of the one-to-one automatic switching cabinet without isolating switch of the utility model;

[0016] Figure 3 It is a right view of Embodiment 1 of the one-to-one automatic switching cabinet without isolating switch of the utility model;

[0017] Figure 4 It is a bottom view of Embodiment 1 of the one-to-one automatic switching cabinet without isolating switch of the utility model;

[0018] Figure 5 , Figure 6 They are all three-dimensional diagrams of Example 1 of a one-to-one automatic switching cabinet without an isolating switch of the utility model;

[0019] Figure 7 It is a structural schematic diagram of Embodiment 2 of a one-to-one automatic switching cabinet without an isolating switch of the utility model;

[0020] Figure 8 This is a structural schematic diagram of Embodiment 3 of a one-to-one automatic switching cabinet without an isolating switch of the utility model;

[0021] Fig. 9 This is a schematic diagram of the coordination between the front cabinet door and the ventilation window in the utility model;

[0022] Fig.10 The utility model is a circuit diagram of a one-to-one automatic switching cabinet without an isolating switch.

[0023] In the figure: 1 cabinet, 2 input vacuum contactor, 3 bypass vacuum contactor, 4 output vacuum contactor, 5 input insulator, 6 output insulator, 7 first connecting copper bar, 8 second connecting copper bar, 9 third connecting copper bar, 10 upper terminal, 11 lower terminal, 12 controller installation box, 13 forklift hole, 14 lifting ring, 15 front cabinet door, 16 side cabinet door, 17 rear cabinet door, 18 top threading hole, 19 display screen installation slot, 20 indicator light installation hole, 21 assembly hole, 22 inverter, 23 bottom threading hole, 24 ventilation window, 25 fourth connecting copper bar. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Embodiment 1, as Figures 1 to 4 As shown, the front view, left view, right view and bottom view of the one-to-one automatic switching cabinet without isolating switch of the utility model are given. Figure 5 and Figure 6The three-dimensional diagrams are given. The high-voltage frequency converter without isolating switch one-to-one automatic switching cabinet shown is composed of a cabinet 1 and an input vacuum contactor 2, a bypass vacuum contactor 3, an output vacuum contactor 4, an input insulator 5 and an output insulator 6 arranged in the cabinet 1. The cabinet 1 plays a fixing and supporting role. The front and rear sides of the cabinet 1 are respectively provided with a front cabinet door 15 and a rear cabinet door 17, and both sides of the cabinet 1 are provided with side cabinet doors 16. The input vacuum contactor 2 shown is fixed to the upper end of the front side of the cabinet 1, the bypass vacuum contactor 3 is fixed to the middle of the rear side of the cabinet 1, and the output vacuum contactor 4 is located below the bypass vacuum contactor 3. The input vacuum contactor 2, the bypass vacuum contactor 3 and the output vacuum contactor 4 are in a mutually aligned state, the input insulator 5 is fixed at a position close to the input vacuum contactor 2, and the output insulator 6 is fixed at a position close to the output vacuum contactor 4. The bottom of the cabinet 1 is provided with a bottom threading hole 23.

[0026] The lower terminal 11 of the input vacuum contactor 2 is connected to the input insulator 5 via the first connecting copper bar 7, and the upper terminal of the bypass vacuum contactor 3 is connected to the input insulator 5 via the second connecting copper bar 8. In this way, the lower terminal 11 of the input vacuum contactor 2 is electrically connected to the upper terminal 10 of the bypass vacuum contactor 3 via the first connecting copper bar 7 and the second connecting copper bar 8. The upper terminal of the output vacuum contactor 4 is connected to the output insulator 6 via the fourth connecting copper bar 25, and the lower terminal of the bypass vacuum contactor 3 is connected to the output insulator 6 via the third connecting copper bar 9. In this way, the lower terminal of the bypass vacuum contactor 3 is electrically connected to the upper terminal of the output vacuum contactor 4 via the third connecting copper bar 9 and the fourth connecting copper bar 25 in turn.

[0027] The upper terminal 10 of the input vacuum contactor 2 is connected to the input end of the frequency converter 22 via a cable passing through the bottom threading hole 23, and the lower terminal 11 of the output vacuum contactor 2 is connected to the output end of the frequency converter 22 via a cable passing through the bottom threading hole 23.

[0028] like Fig.10 As shown, the circuit principle diagram of the one-to-one automatic switching cabinet without isolating switch of the utility model is given. Fig.10KM1 in the figure represents input vacuum contactor 2, KM3 represents bypass vacuum contactor 3, KM2 represents output vacuum contactor 4, input insulator 5 is connected to the power grid, and output insulator is connected to the load motor. When the motor needs to be frequency-controlled, bypass vacuum contactor 3 is disconnected, while input vacuum contactor 2 and output vacuum contactor 4 are closed. At this time, the AC power input from the power grid is input to the motor after frequency conversion by frequency converter 22 to control the motor frequency conversion operation; when the motor needs to be controlled at industrial frequency, input vacuum contactor 2 and output vacuum contactor 4 are both disconnected, while bypass vacuum contactor 3 is closed. At this time, the AC power input from the power grid directly drives the load motor to work, realizing industrial frequency drive of the motor. It can be seen that the one-to-one automatic switching cabinet without isolation switch of the utility model can realize the switching control of industrial frequency and variable frequency of the load motor.

[0029] The cabinet 1 shown in the figure does not have an isolating switch, which saves space for arranging the isolating switch and can effectively reduce the volume of the cabinet 1. At the same time, it also reduces the manufacturing cost of the one-to-one automatic switching cabinet without isolating switch of the utility model and saves space for installing the switching cabinet.

[0030] The front cabinet door 15 of the cabinet body 1 is provided with a controller mounting box 12, a display screen mounting slot 19 and an indicator light mounting hole 20. The controller of the switching cabinet is installed in the controller mounting box 12. Fig. 9 As shown, a schematic diagram of the cooperation between the front cabinet door and the ventilation window in the utility model is given. After the controller is installed in the controller installation box 12, the ventilation window 24 is installed on the outside. The display screen installation groove 19 is used to place the display screen, and the indicator light installation hole 20 is used to place the indicator light.

[0031] The bottom of the cabinet 1 shown is provided with a forklift hole 13 so that the entire switch cabinet can be moved by a forklift. Lifting rings 14 are fixed on the four corners above the cabinet 1 so that the entire switch cabinet can be lifted and installed by a lifting device. The columns on both sides of the cabinet 1 shown are provided with assembly holes 21, and the cabinet 1 can be assembled together with other cabinets through the assembly holes 21. The upper surface of the cabinet 1 shown is provided with a top threading hole 18. For occasions where it is inconvenient to thread the wires through the bottom threading hole 23, the cables connected to the input vacuum contactor 2, the output vacuum contactor 4, the input insulator 5 and the output insulator 6 can pass through the top threading hole 18.

[0032] Embodiment 2, as Figure 7 As shown, a structural schematic diagram of embodiment 2 of a one-to-one automatic switching cabinet without an isolating switch of the utility model is given. Except that the installation positions of the input vacuum contactor 2, the bypass vacuum contactor 3, the output vacuum contactor 4, the input insulator 5 and the output insulator 6 in the cabinet body 1 are different from those in embodiment 1, the rest of the structures of the switching cabinet in this embodiment are the same.

[0033] In this embodiment, the input vacuum contactor 2 is located at the lower end of the front part of the inner cavity of the cabinet 1, the output vacuum contactor 4 is located at the upper end of the rear part of the inner cavity of the cabinet 1, and the bypass vacuum contactor 3 is located below the output vacuum contactor 4. The upper terminal of the input vacuum contactor 2 is connected to the input insulator 5 via the first connecting copper bar 7, and the upper terminal of the bypass vacuum contactor 3 is connected to the input insulator 5 via the second connecting copper bar 8; the lower terminal of the bypass vacuum contactor 3 is connected to the output insulator 6 via the third connecting copper bar 9.

[0034] Embodiment 3, as Figure 8 As shown, a structural schematic diagram of embodiment 3 of a one-to-one automatic switching cabinet without an isolating switch of the utility model is given. Except that the installation positions of the input vacuum contactor 2, the bypass vacuum contactor 3, the output vacuum contactor 4, the input insulator 5 and the output insulator 6 in the cabinet body 1 are different from those in embodiment 1, the rest of the structures of the switching cabinet in this embodiment are the same.

[0035] In this embodiment, the bypass vacuum contactor 3 is located at the upper end of the middle part of the cabinet 1, and the input vacuum contactor 2 and the output vacuum contactor 4 are both located below the bypass vacuum contactor 3, and the input vacuum contactor 2 is located at the front end and the output vacuum contactor 4 is located at the rear end. The upper terminal of the input vacuum contactor 2 is connected to the input insulator 5 via the first connecting copper bar 7, and the lower terminal of the bypass vacuum contactor 3 is connected to the input insulator 5 via the second connecting copper bar 8. The upper terminal of the bypass vacuum contactor 3 is connected to the output insulator 6 via the third connecting copper bar 9, and the upper terminal of the output vacuum contactor 4 is connected to the output insulator 6 via the fourth connecting copper bar 25.

Claims

1. A high-voltage frequency converter non-isolating switch one-to-one automatic switching cabinet, comprising a cabinet body (1) and an input vacuum contactor (2), a bypass vacuum contactor (3) and an output vacuum contactor (4) fixed in the cabinet body, a front cabinet door (15), a rear cabinet door (17) and a side cabinet door (16) are respectively arranged on the front, rear and two side surfaces of the cabinet body, and a bottom threading hole (23) is arranged on the bottom of the cabinet body; the characteristics are: No isolating switch is provided in the cabinet; an input insulator (5) and an output insulator (6) are respectively fixed at positions close to the input vacuum contactor and the output vacuum contactor in the cabinet; The lower terminal (11) or the upper terminal (10) of the input vacuum contactor is connected to the input insulator via the first connecting copper bar (7), the input insulator is connected to the upper terminal or the lower terminal of the bypass vacuum contactor via the second connecting copper bar (8), the terminal on the bypass vacuum contactor not connected to the input insulator is connected to the output insulator via the third connecting copper bar (9), and the upper terminal or the lower terminal of the output vacuum contactor is connected to the output insulator via the fourth connecting copper bar (25); the terminal on the input vacuum contactor not connected to the input insulator is connected to the input end of the frequency converter (22) via a cable passing through the bottom threading hole, and the terminal on the output vacuum contactor not connected to the output insulator is connected to the output end of the frequency converter via the cable passing through the bottom threading hole.

2. The high-voltage frequency converter one-to-one automatic switching cabinet without isolating switch according to claim 1 is characterized in that: A controller installation box (12) is provided on the front cabinet door (15) of the cabinet body (1), a controller is fixed inside the controller installation box, and a ventilation window (24) is fixed outside the controller installation box.

3. The high-voltage frequency converter one-to-one automatic switching cabinet without isolating switch according to claim 1 or 2, characterized in that: The bottom of the cabinet (1) is provided with a forklift hole (13), and four corners of the top of the cabinet are fixed with lifting rings (14).

4. The high-voltage frequency converter one-to-one automatic switching cabinet without isolating switch according to claim 1 or 2, characterized in that: A top threading hole (18) is provided on the upper surface of the cabinet (1) to replace the bottom threading hole (23).

5. The high-voltage frequency converter one-to-one automatic switching cabinet without isolating switch according to claim 1 or 2, characterized in that: The front cabinet door (15) of the cabinet body (1) is provided with a display screen mounting groove (19) and an indicator light mounting hole (20).

6. The high-voltage frequency converter one-to-one automatic switching cabinet without isolating switch according to claim 1 or 2, characterized in that: The columns on both sides of the cabinet body (1) are provided with assembly holes (21) for assembly with other cabinet bodies.