Silicon controlled rectifier intermediate frequency power supply equipment

Abstract

The utility model belongs to the technical field of medium-frequency power supplies, and discloses silicon controlled rectifier medium-frequency power supply equipment, which comprises a power supply box, an inversion module and a capacitor bank which are arranged up and down are arranged in the power supply box, a connecting copper bar group is arranged between the inversion module and the capacitor bank, and the inversion module comprises a silicon controlled rectifier assembly, a current-limiting inductor and a pulse plate. The connecting copper bar group comprises a first copper bar, a second copper bar, a third copper bar and a fourth copper bar which are sequentially arranged from front to back, the first copper bar is provided with an overvoltage protection assembly, the two silicon controlled rectifier assemblies are connected in series through the third copper bar, and the capacitor group comprises a plurality of filter capacitors and compensation capacitors which are arranged side by side. The filter capacitors and the compensation capacitors are arranged in a crossed manner, all the filter capacitors are connected in series through a first copper bar, and all the compensation capacitors are connected in series through a second copper bar; according to the utility model, the vertical compact layout is adopted, the balance of current flow is ensured, and the stability of the output current of the medium-frequency power supply equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medium frequency power supply, in particular to a silicon controlled medium frequency power supply device. Background Art

[0002] The thyristor medium frequency power supply is a power supply device that uses the switching characteristics of thyristors to convert 50Hz industrial frequency AC power into medium frequency AC power. Its working principle is that the three-phase industrial frequency AC power is first converted into an adjustable DC power supply through a three-phase bridge rectifier, and then the DC power supply is transmitted to a single-phase inverter bridge after filtering by the reactance. Then, through pulse control, the diagonal lines of the single-phase bridge are alternately switched to form a single-phase medium frequency current. Finally, the current is sent to the induction coil, causing the metal charge in the induction coil to generate medium frequency eddy currents, which heats the charge and even melts it.

[0003] In the Chinese utility model patent with patent application number 202222790179.8, a thyristor series inverter medium frequency power supply device is proposed. The main problem of this patent is that all thyristors and capacitors are arranged side by side on the left and right, which makes it impossible to set them correspondingly with the filter capacitor and the compensation capacitor, so that the thyristor output current cannot be completely evenly distributed to each capacitor, and the current balance is poor. Utility Model Content

[0004] The main technical problem to be solved by the utility model is to provide a thyristor medium frequency power supply device, which adopts a compact upper and lower layout, ensures the balance of current flow, and improves the stability of the output current of the medium frequency power supply device.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A thyristor medium frequency power supply device comprises a power supply box, wherein an inverter module and a capacitor group are installed in the power supply box, a connecting copper bar group is arranged between the inverter module and the capacitor group, and a control module and a rectifier module are arranged on one side of the inverter module and the capacitor group;

[0007] The inverter module includes two thyristor components arranged side by side, the thyristor components are fixed in the power box through the mounting components, the rear side of the thyristor components is connected to the limited current inductor, and a pulse plate is arranged between the two thyristor components;

[0008] The connecting copper bar group includes a first copper bar, a second copper bar, a third copper bar and a fourth copper bar arranged in sequence from front to back, an overvoltage protection component is installed on the first copper bar, and two thyristor components are connected in series through the third copper bar;

[0009] The capacitor group includes a plurality of filter capacitors and compensation capacitors arranged side by side, the filter capacitors and compensation capacitors are arranged in a cross layout, all the filter capacitors are connected in series through a first copper busbar, and all the compensation capacitors are connected in series through a second copper busbar.

[0010] The following is a further optimization of the above technical solution by the utility model:

[0011] The mounting assembly includes a mounting frame, on the front wall of which a first conductive copper plate and a second conductive copper plate are fixed, the first conductive copper plate is connected to the first copper bar via a fifth copper bar, and the second conductive copper plate is connected to the second copper bar via a sixth copper bar.

[0012] Further optimization: the thyristor assembly includes two pairs of thyristors, and a thyristor is respectively arranged above both ends of the first conductive copper plate and below both ends of the second conductive copper plate.

[0013] Further optimization: the control module includes a control switch and a converter, and the control switch and the converter are fixed inside the power box.

[0014] Further optimization: the rectifier module includes a three-phase bridge rectifier connected to the lower part of the control switch, the lower end of the three-phase bridge rectifier is connected to a reactor, and the lower part of the reactor is connected to a single-phase inverter bridge.

[0015] The utility model adopts the above technical solution and has the following beneficial effects:

[0016] 1. The utility model adopts the above technical solution, which is ingenious in conception and reasonable in structure. The thyristor and the capacitor are arranged in a corresponding upper and lower layout, and the filter capacitor and the compensation capacitor are arranged at cross intervals and evenly distributed under the thyristor, so that the current output of each thyristor is more balanced.

[0017] 2. Compared with the structure of capacitors and thyristors arranged on the left and right, the structure of the top-bottom layout is not only more compact in structure, making the power supply equipment smaller in size, but also improves the stability of the output current.

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the utility model;

[0021] Figure 2 for Figure 1 Schematic cross-sectional view along the AA axis.

[0022] Among them: 1-power box; 2-inverter module; 21-thyristor assembly; 22-current limiting inductor; 23-pulse plate; 3-capacitor group; 31-filter capacitor; 32-compensation capacitor; 4-connecting copper bar group; 41-first copper bar; 42-second copper bar; 43-third copper bar; 44-fourth copper bar; 45-fifth copper bar; 46-sixth copper bar; 5-control module; 51-control switch; 52-transformer; 6-rectifier module; 61-three-phase bridge rectifier; 62-reactor; 63-single-phase inverter bridge; 7-installation assembly; 71-installation frame; 72-first conductive copper plate; 73-second conductive copper plate; 8-overvoltage protection assembly; 81-resistor; 82-protection capacitor. 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 of 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] like Figure 1 and Figure 2 As shown together, a thyristor medium frequency power supply device includes a power box 1, in which an inverter module 2 and a capacitor group 3 are installed in the upper and lower positions, a connecting copper busbar group 4 is arranged between the inverter module 2 and the capacitor group 3, and a control module 5 and a rectifier module 6 are arranged on one side of the inverter module 2 and the capacitor group 3.

[0025] In this embodiment, a water cooling system, a control circuit and other structures are also provided in the power box 1, and their installation positions, connection relationships and control principles all constitute the prior art and will not be described in detail here.

[0026] Among them, the inverter module 2 includes two thyristor components 21 arranged side by side on the left and right. The thyristor component 21 is fixed in the power box 1 through the installation component 7. The rear side of the thyristor component 21 is connected to the limited current inductor 22, and a pulse plate 23 is arranged between the two thyristor components 21.

[0027] In this embodiment, the thyristor assembly 21 and the capacitor group 3 are compactly arranged up and down, so that each thyristor in the thyristor assembly 21 is arranged correspondingly with the filter capacitor 31 and the compensation capacitor 32 in the capacitor group 3, so that the current output by each thyristor can be stably and evenly distributed and input into the filter capacitor 31 and the compensation capacitor 32, thereby improving the balance of current transmission and achieving the purpose of current balancing.

[0028] The connecting copper bar group 4 includes a first copper bar 41 , a second copper bar 42 , a third copper bar 43 and a fourth copper bar 44 arranged in sequence from front to back. An overvoltage protection component 8 is installed on the first copper bar 41 , and the two thyristor components 21 are connected in series through the third copper bar 43 .

[0029] In this embodiment, the structure of the upper and lower layout reduces the number of copper bars in the connecting copper bar group 4, and only four copper bars, namely the first copper bar 41, the second copper bar 42, the third copper bar 43 and the fourth copper bar 44, are used to complete the connection work, thereby reducing the overall energy consumption of the power supply equipment.

[0030] In this embodiment, the overvoltage protection component 8 includes a resistor 81 installed on the front wall of the first copper busbar 41 , and the resistor 81 is connected to two ends of the thyristor component 21 via a protection capacitor 82 .

[0031] The capacitor group 3 includes a plurality of filter capacitors 31 and compensation capacitors 32 arranged in parallel. The filter capacitors 31 and compensation capacitors 32 are arranged in a cross-layout. All the filter capacitors 31 are connected in series through a first copper busbar 41 , and all the compensation capacitors 32 are connected in series through a second copper busbar 42 .

[0032] In this embodiment, the filter capacitor 31 and the compensation capacitor 32 are arranged in a cross-spaced manner so that the capacitors are evenly distributed, thereby ensuring the balance of the distributed current of each capacitor, thereby making the power output by the power supply device more stable, thereby ensuring the smelting quality of the induction furnace.

[0033] The mounting assembly 7 includes a mounting frame 71, on the front wall of which a first conductive copper plate 72 and a second conductive copper plate 73 are fixed, which are arranged one above the other. The first conductive copper plate 72 is connected to the first copper bar 41 through the fifth copper bar 45, and the second conductive copper plate 73 is connected to the second copper bar 42 through the sixth copper bar 46.

[0034] In this embodiment, the mounting frame 71 is not only equipped with the thyristor assembly 21 , but also includes a diode assembly, a current limiting assembly and a filter assembly, so that they are integrated into a modular assembly on the mounting frame 71 .

[0035] In this embodiment, the structures, installation relationships and working principles of the diode component, current limiting component and filter component all constitute the prior art and are well known to ordinary technicians in the field, and will not be repeated here.

[0036] The thyristor assembly 21 includes two pairs of thyristors. A thyristor is disposed above both ends of the first conductive copper plate 72 and below both ends of the second conductive copper plate 73 .

[0037] In this embodiment, the installation and working principle of the thyristor on the mounting frame 71 constitute the prior art and will not be described in detail here.

[0038] The control module 5 includes a control switch 51 and a transformer 52 , and the control switch 51 and the transformer 52 are fixed inside the power box 1 .

[0039] In this embodiment, the transformer 52 may be a small transformer available on the market.

[0040] In this embodiment, the arrangement of the control switch 51 and the inverter 52 can control the on and off of the medium frequency power supply device, so as to improve the safety of the use of the medium frequency power supply device.

[0041] The rectifier module 6 includes a three-phase bridge rectifier 61 connected to the lower part of the control switch 51 , a reactor 62 is connected to the lower end of the three-phase bridge rectifier 61 , and a single-phase inverter bridge 63 is connected to the lower part of the reactor 62 .

[0042] In this embodiment, the three-phase bridge rectifier 61 , the single-phase inverter bridge 63 and the connecting copper bar group 4 can be interconnected in circuit.

[0043] In this embodiment, the reactor 62 is a self-cooling type reactor.

[0044] 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 thyristor medium frequency power supply device, comprising a power supply box (1), characterized in that: The power box (1) has an inverter module (2) and a capacitor group (3) installed in an upper and lower arrangement, a connecting copper busbar group (4) is arranged between the inverter module (2) and the capacitor group (3), and a control module (5) and a rectifier module (6) are arranged on one side of the inverter module (2) and the capacitor group (3); The inverter module (2) comprises two thyristor components (21) arranged side by side on the left and right, the thyristor components (21) are fixed in the power supply box (1) through the mounting component (7), the rear side of the thyristor components (21) is connected to a current-limiting inductor (22), and a pulse plate (23) is arranged between the two thyristor components (21); The connecting copper bar group (4) includes a first copper bar (41), a second copper bar (42), a third copper bar (43) and a fourth copper bar (44) arranged in sequence from front to back, an overvoltage protection component (8) is installed on the first copper bar (41), and two thyristor components (21) are connected in series via the third copper bar (43); The capacitor group (3) comprises a plurality of filter capacitors (31) and compensation capacitors (32) arranged in parallel, the filter capacitors (31) and compensation capacitors (32) being arranged in a cross-layout, all the filter capacitors (31) being connected in series via a first copper busbar (41), and all the compensation capacitors (32) being connected in series via a second copper busbar (42).

2. A thyristor medium frequency power supply device according to claim 1, characterized in that: The mounting assembly (7) comprises a mounting frame (71), a first conductive copper plate (72) and a second conductive copper plate (73) arranged vertically are fixed to the front wall of the mounting frame (71), the first conductive copper plate (72) is connected to the first copper bar (41) via a fifth copper bar (45), and the second conductive copper plate (73) is connected to the second copper bar (42) via a sixth copper bar (46).

3. A thyristor medium frequency power supply device according to claim 2, characterized in that: The thyristor assembly (21) comprises two pairs of thyristors, with one thyristor being arranged above both ends of the first conductive copper plate (72) and below both ends of the second conductive copper plate (73), respectively.

4. A thyristor medium frequency power supply device according to claim 1, characterized in that: The control module (5) comprises a control switch (51) and a transformer (52), and the control switch (51) and the transformer (52) are fixed inside the power supply box (1).

5. A thyristor medium frequency power supply device according to claim 4, characterized in that: The rectifier module (6) comprises a three-phase bridge rectifier (61) connected to the lower part of the control switch (51), the lower end of the three-phase bridge rectifier (61) is connected to a reactor (62), and the lower part of the reactor (62) is connected to a single-phase inverter bridge (63).

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