Rectifier cabinet, rectifier transformer and rectifier unit

Abstract

The utility model provides a rectifier cabinet, a rectifier transformer and a rectifier unit, and relates to the field of graphitization furnace power transmission equipment.The rectifier cabinet comprises a rectifier circuit arranged in the rectifier cabinet, and the rectifier circuit comprises a first water-cooling copper bar, a second water-cooling copper bar and a plurality of rectifier arms; the plurality of rectification arms are arranged in parallel between the first water-cooling copper bar and the second water-cooling copper bar; wherein the rectifying circuit is provided with a plurality of input terminals on the alternating current side and a plurality of output terminals on the direct current side, the plurality of input terminals are connected with the first water-cooling copper bar, and the plurality of output terminals are connected with the second water-cooling copper bar; the plurality of input terminals are arranged on the alternating current side of the rectifier cabinet and share all rectifier bridges together, so that the current density required by the first water-cooling copper bar is greatly reduced, the cross sectional area of the first water-cooling copper bar is greatly reduced, the use amount of the copper bar is saved, and the use cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of power transmission equipment for graphitization furnaces, and in particular to a rectifier cabinet, a rectifier transformer, and a rectifier unit. Background Art

[0002] A rectifier cabinet is a device that converts AC power into DC power, and is commonly used in rectifier transformers. A rectifier cabinet has an AC side and a DC side. It contains a built-in rectifier circuit. The rectifier circuit draws current from the external environment on the AC side and then outputs the converted DC current to the external environment on the DC side.

[0003] Usually, a large number of copper bars are used in the rectifier circuit to maintain its conductivity. However, if too many copper bars are used in the rectifier circuit, the cost of using the rectifier cabinet will be high.

[0004] In view of this, it is necessary to propose a new technical solution to solve the above technical problems. Summary of the Invention

[0005] The purpose of this application is to provide a rectifier cabinet, a rectifier transformer and a rectifier unit, which can reduce the copper busbar consumption of the rectifier circuit and reduce the use cost of the rectifier cabinet.

[0006] To achieve the above objectives, this application adopts the following technical means:

[0007] In a first aspect of the present application, a rectifier cabinet is provided, wherein a rectifier circuit is provided therein, the rectifier circuit comprising: a first water-cooled copper bar, a second water-cooled copper bar, and a plurality of rectifier arms, wherein the plurality of rectifier arms are arranged in parallel between the first water-cooled copper bar and the second water-cooled copper;

[0008] The rectifier circuit is provided with a plurality of input terminals on the AC side and an output terminal on the DC side, and the plurality of input terminals are connected to the first water-cooling copper busbar. The AC power enters the rectifier circuit through the plurality of input terminals, is converted into DC power by the rectifier arm, and then leaves the rectifier circuit through the output terminal.

[0009] Optionally, the rectifier circuit is provided with a plurality of output terminals on the DC side, and the plurality of output terminals are connected to the second water-cooling copper busbar.

[0010] Optionally, the rectifier circuit includes: two input terminals and two said output terminals, the two said input terminals are spaced apart from each other, and the two said output terminals are spaced apart from each other.

[0011] Optionally, the output terminal and the output terminal are both flat.

[0012] Optionally, the rectifier arm includes: a diode and a fuse, the diode is connected to the fuse, and the diode is configured to only allow current to flow from the input terminal to the output terminal; the fuse is arranged downstream of the current flow direction of the diode.

[0013] Optionally, the first water-cooling copper busbar includes: a copper busbar body and a water-cooling pipe, and the water-cooling pipe is arranged in contact with the copper busbar body.

[0014] Optionally, the first water-cooling copper bar and the second water-cooling copper bar are arranged parallel to each other and spaced apart.

[0015] A second aspect of the present application provides a rectifier transformer, a transformer body, and a rectifier cabinet according to any one of the above items, wherein the rectifier cabinet is electrically connected to the transformer.

[0016] Optionally, a plurality of AC side terminals are provided on the AC side of the transformer body, and the number of the AC side terminals is the same as the number of input terminals of the rectifier cabinet.

[0017] A third aspect of the present application provides a rectifier unit, comprising: any one of the above-mentioned rectifier transformers.

[0018] Compared with traditional technologies, this application brings the following technical effects:

[0019] The rectifier cabinet of the present application has a rectifier circuit with several input terminals on the AC side. AC power enters the rectifier circuit via the several input terminals and selects a rectifier bridge to pass through based on the distance closest to the output terminal. The AC power entering the rectifier circuit is distributed to all rectifier bridges. That is, the number of rectifier bridges to which the AC power input via each input terminal is distributed is greatly reduced. The cross-sectional area of ​​the first water-cooling copper busbar is determined based on the current density of the AC power distributed to the most rectifier bridges. The current density required for the first water-cooling copper busbar is greatly reduced, thereby greatly reducing the cross-sectional area of ​​the first water-cooling copper busbar, greatly reducing the amount of copper busbar used for the first water-cooling copper busbar, and reducing the cost of the rectifier cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 The working principle diagram of the rectifier cabinet in the traditional technology is shown;

[0022] Figure 2 A schematic diagram of the internal structure of a rectifier transformer according to some embodiments of the present application is shown;

[0023] Figure 3 Shown Figure 2 Schematic diagram of the circuit structure;

[0024] Figure 4 Shown Figure 3 Schematic diagram of the principle;

[0025] Figure 5 A schematic structural diagram of a rectifier transformer according to some embodiments of the present application is shown;

[0026] Figure 6 The figure shows a schematic structural diagram of a rectifier unit according to some embodiments of the present application.

[0027] Description of main component symbols:

[0028] 100-rectifier transformer; 10-rectifier cabinet; 11-input terminal; 12-first water-cooling copper busbar; 13-rectifier arm; 131-diode; 132-fuse; 14-second water-cooling copper busbar; 15-output terminal; 20-rectifier transformer; 21-AC side terminal; 20-transformer body; 30-AC copper busbar. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0030] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0031] A rectifier cabinet is a device that converts AC power into DC power and is commonly used in rectifier transformers. A rectifier cabinet has an AC side and a DC side. The AC side is used to receive current from the outside world, while the DC side is used to output the converted DC current to the outside world.

[0032] See also Figure 1 Conventional technology discloses a rectifier cabinet 10. The rectifier cabinet 10 houses a rectifier circuit comprising a first water-cooling copper bar 12, a second water-cooling copper bar 14, and a plurality of rectifier arms 13. The first and second water-cooling copper bars 12, 14 are arranged parallel to each other and spaced apart. The rectifier arms 13 are connected in parallel to the first and second water-cooling copper bars 12, 14.

[0033] The two sides of the rectifier circuit are respectively connected to an output terminal 15 and an input terminal 11. AC power enters the rectifier circuit through the input terminal 11, and is rectified by the rectifier circuit and output from the output terminal 15 in the form of DC power.

[0034] Specifically, AC power is first input into the rectifier circuit through input terminal 11 , and then propagates in two directions on the first water-cooling copper busbar 12 ; the AC power is converted into DC power through the rectifier arm 13 ; the DC power then merges with the second water-cooling copper busbar 14 and is finally output from the output terminal 15 .

[0035] The current density on the first water-cooling copper bar 12 is determined by the number of rectifier bridges allocated. The more rectifier bridges there are, the higher the current density required by the first water-cooling copper bar 11; conversely, the fewer rectifier bridges there are, the lower the current density required.

[0036] In order to ensure that the alternating current can be transmitted in the rectifier circuit, the cross-sectional area of ​​the first water-cooling copper bar 12 must be made large enough to ensure a sufficiently large current density. However, this will result in excessive use of the copper bar and high cost.

[0037] Example 1

[0038] Some embodiments of the present application provide a rectifier transformer 100 to solve the problem of large copper busbar usage and high cost in the rectifier transformer.

[0039] See also Figure 2 and Figure 3 A rectifier circuit and a housing covering the rectifier circuit are provided in the rectifier cabinet 10. During operation of the rectifier cabinet, the housing protects the rectifier circuit.

[0040] The rectifier circuit has two input terminals 11 on the AC side and two output terminals 15 on the DC side. Current enters the rectifier circuit through the two input terminals 11 and is output to the outside through the two output terminals 15 after rectification.

[0041] The AC side and DC side are located on opposite sides of the rectifier circuit. Figure 2 The AC side is located on the left side of the rectifier circuit, and the DC side is located on the right side of the rectifier circuit. The AC side is used to connect to devices that generate AC power, allowing the outside world to input AC power into the rectifier cabinet 10; the DC side is used to connect to devices that generate DC power, so that the DC power is converted to DC power by the rectifier circuit and output to the outside world.

[0042] Specifically, the rectifier circuit includes: a first water-cooling copper bar 12, a second water-cooling copper bar 14 and a plurality of rectifier arms 13. The first water-cooling copper bar 12 and the second water-cooling copper bar 14 are arranged at intervals from each other, and the plurality of rectifier arms 13 are arranged in parallel between the first water-cooling copper bar 12 and the second water-cooling copper bar 14.

[0043] The first water-cooling copper bar 12 and the second water-cooling copper bar 14 are arranged parallel to each other and spaced apart, which can fully utilize the space and reduce the volume of the rectifier cabinet.

[0044] The first water-cooling copper busbar 12 is connected to the two AC-side input terminals 11 , respectively, and the second water-cooling copper busbar 14 is connected to the two DC-side output terminals 15 .

[0045] In the rectifier cabinet of the present application, the rectifier circuit provided in the rectifier cabinet 10 is provided with a plurality of input terminals 11 on the AC side and a plurality of output terminals 15 on the DC side. Alternating current enters the rectifier circuit via the plurality of input terminals 11, and selects a rectifier bridge to pass through with the shortest distance to the output terminal 15. All the rectifier bridges are distributed to the plurality of input terminals 11, so that the number of rectifier bridges distributed to the alternating current input via each input terminal 11 is greatly reduced, and the cross-sectional area of ​​the first water-cooled copper bar 12 is determined according to the current density of the alternating current distributed to the most rectifier bridges. The current density required by the first water-cooled copper bar 12 is greatly reduced, thereby greatly reducing the cross-sectional area of ​​the first water-cooled copper bar, greatly reducing the amount of copper bar used for the first water-cooled copper bar 12, and having low cost of use.

[0046] Furthermore, when the numbers of rectifier bridges corresponding to the alternating currents entering the rectifier circuit from the plurality of input terminals 11 are different, the cross-sectional area of ​​the first water-cooling copper busbar 12 should be adapted to distribute the alternating currents of more rectifier bridges.

[0047] To further illustrate the principle, a practical example is provided. The total current density of the input rectifier circuit is i, and the AC side of the rectifier circuit is provided with two input terminals 11, each of which is split into 0.5i and enters the rectifier circuit.

[0048] Ten rectifier arms 13 are connected in parallel between the first water-cooling copper bar 12 and the second water-cooling copper bar 14 of the rectifier circuit. The two input terminals 11 are spaced apart, and each input terminal 11 corresponds to five rectifier bridges. This minimizes the distance that the AC power travels through these five rectifier bridges to reach the output terminals 15. For example, three rectifier arms 13 are located on one side of an input terminal 11, and two on the other side.

[0049] Then, the AC current is divided into two parts at the first water-cooled copper busbar 12. The part flowing upward is divided into 0.3i corresponding to three rectifier arms, and the part flowing downward is divided into 0.2i corresponding to two rectifier arms. Therefore, the cross-sectional area of ​​the first water-cooled copper busbar corresponds to the 0.3i setting.

[0050] See again Figure 1In the comparative example, the rectifier circuit of the rectifier cabinet 10 has one input terminal 11 and one output terminal 15 , and ten rectifier bridges 13 are provided between the first water-cooling copper busbar 12 and the second water-cooling circuit 14 .

[0051] The input terminals 11 and output terminals 15 are arranged in a "bottom-in, top-out" configuration. The input terminals 11 are located slightly below the AC side of the rectifier cabinet 10, while the output terminals 15 are located slightly above the DC side of the rectifier cabinet 10. Specifically, seven rectifier arms 13 are located above the input terminals 11, and three are located below them. The output terminals 15 are located slightly above the rectifier cabinet 10.

[0052] The current density of the AC electrons entering the rectifier circuit from input terminal 11 is configured as i. This current is split into two parts on the first water-cooling copper busbar 12: one part flows upward along the busbar 12, and the other part flows downward along the busbar 12. The upward AC current flows across seven rectifier bridges 13, with a current density of 0.7i. The downward AC current flows across three rectifier bridges 13, with a current density of 0.3i. To accommodate the upward AC current, the first water-cooling copper busbar 12 must be designed with a cross-sectional area that meets the current density of 0.7i.

[0053] In summary, if only the number of input terminals 11 and output terminals 15 is changed, and other conditions remain the same, the cross-sectional area of ​​the first water-cooling copper bar 12 in this application corresponds to a 0.3i configuration, which is much smaller than the cross-sectional area of ​​the first water-cooling copper bar 12 in the conventional technology corresponding to a 0.7i configuration. The above case study more intuitively concludes that reducing the cross-sectional area of ​​the first water-cooling copper bar 12 reduces the amount of copper bar used.

[0054] Correspondingly, two output terminals 15 are provided on the AC side of the second water-cooling copper bar 14, which can effectively reduce the cross-sectional area of ​​the second water-cooling copper bar 14. The technical effect reasoning process is not repeated here.

[0055] The number of the rectifier bridge 13 , the input terminals 11 and the output terminals 15 can be adaptively set according to actual scenarios and is not limited to the specific limitations of the specific implementation.

[0056] As an alternative embodiment, the AC side of the rectifier circuit may also use only one input terminal 11 and the DC side may use multiple output terminals 15, which can greatly reduce the cross-sectional area of ​​the second water-cooling copper busbar 14; or a plurality of input terminals 11 may be provided on the AC side of the rectifier circuit and only one output terminal 15 may be used on the DC side, which can greatly reduce the cross-sectional area of ​​the first water-cooling copper busbar 12.

[0057] Specifically, the input terminal 11 can be made of a flat conductive copper plate. The flat shape not only increases the contact area between the input terminal 11 and the AC power supply, improves the stability of the connection between the two, and reduces the difficulty of connection, but also reduces the skin effect, reduces resistance, and reduces power consumption.

[0058] Correspondingly, the output terminal 15 can also adopt a flat conductive copper plate. The flat shape not only increases the contact area between the output terminal 15 and the DC side electrical equipment, improves the stability of the connection between the two, and reduces the difficulty of connection, but also reduces the skin effect, reduces resistance, and reduces power consumption.

[0059] Of course, the input terminal 11 and the output terminal 15 can also be replaced by conductive posts, plugs and sockets, etc.

[0060] In this embodiment, the two input terminals 11 are spaced a certain distance apart, and the two output terminals 15 are spaced apart from each other. This spacing of the two input terminals 11 prevents self-inductance before the AC power enters the rectifier circuit, thereby ensuring the stability of the AC power entering the rectifier circuit. Correspondingly, the spacing of the two output terminals 15 reduces self-inductance when the DC power is output from the two output terminals 15, thereby ensuring the stability of the DC power output from the rectifier circuit.

[0061] Specifically, the first water-cooling copper bar 12 and the second water-cooling copper bar 14 are both composed of a copper bar body and a cooling pipe, and the cooling pipe is arranged in contact with the copper bar body.

[0062] The cooling water flowing in the cooling pipe can exchange heat with the copper busbar to relieve the overheating of the copper busbar during operation. The cooling water is driven to circulate in the cooling pipe by a pumping device, which will not be described in detail here.

[0063] Furthermore, the copper busbar body can be configured to be hollow, with the cooling pipe running through it. This allows for a larger contact area between the copper busbar body and the cooling pipe, improving the heat exchange effect of the cooling water. Alternatively, the cooling pipe can be directly fixed to a side surface of the copper busbar body, or the cooling pipe can be wound around the copper busbar body in an S-shaped configuration.

[0064] In addition, the copper busbar body can be a cylinder or prism with a uniform cross-sectional area, which can ensure the stability of the local current density.

[0065] Of course, the first water-cooled copper bar 12 and the second water-cooled copper bar 14 can also be replaced by ordinary copper bars, aluminum bars, etc. Compared with ordinary copper bars, water-cooled copper bars have better heat dissipation effect and can have a larger cross-sectional area, so they are suitable for high-power electrical equipment.

[0066] In the related art, since the same-direction current is generated between two adjacent rectifier arms 13, inductance is generated at the rectifier arms 13, which affects the current transmitted on each rectifier arm 13 to varying degrees. In other words, the current sharing effect of adjacent rectifier arms 13 is poor.

[0067] In the rectifier circuit of this embodiment, the current path is uniform, the magnetic field distribution is reasonable, the leakage inductance superposition is minimal, and the rectifier cabinet 10 of this embodiment has the best current balancing effect.

[0068] Specifically, each rectifier arm 13 includes a diode 131 and a fuse 132 , and the fuse 132 is disposed downstream of the diode 131 .

[0069] The diode 131 is arranged in a direction from the input terminal 11 to the output terminal 15 , that is, the diode 131 only allows current to enter from the input terminal 11 and be output from the output terminal 15 .

[0070] The fuse 132 is used to protect circuit components from being damaged by overload or short-circuit current caused by the current passing through the diode 131. Specifically, when the current exceeds a specified value, the fuse melts its fuse element to cut off the circuit to ensure the safety of the entire rectifier circuit.

[0071] Example 2

[0072] See also Figure 4 and Figure 5 In some embodiments of the present application, a rectifier transformer 100 is provided, which can be used in a rectifier unit, and the rectifier unit can be used to supply power to a graphitization furnace.

[0073] The rectifier transformer 100 includes: a transformer body 20 and two rectifier cabinets 10 of any of the above embodiments. The two rectifier cabinets 10 are distributed on the left and right sides of the transformer body 20. AC copper busbars 30 are connected between the transformer body 20 and the two rectifier cabinets 10.

[0074] The AC side of the transformer body 20 is equipped with two AC terminals 21, which are connected to the input terminals 11 of the rectifier cabinet via AC copper busbars. Current first enters the transformer body 20, where it transforms the AC voltage to a level suitable for actual use. The AC copper busbars 30 then transmit the AC current to the rectifier cabinet, where it is redirected and converted into DC.

[0075] Since the rectifier cabinet 10 uses two input terminals 11 , the transformer body 20 is correspondingly provided with AC side terminals 21 . That is, two AC side terminals 21 are arranged on both sides of the transformer body 20 .

[0076] The rectifier transformer 100 of the present application utilizes the rectifier cabinet 10 and transformer body 20 of the aforementioned embodiment. AC power enters the rectifier circuit of the rectifier cabinet 10 via the transformer body 20 and selects a rectifier bridge with the shortest distance to the output terminal 15. AC power enters through a plurality of input terminals 11 and is distributed to all rectifier bridges 13. In other words, the number of rectifier bridges to which AC power input via each input terminal 11 is distributed is reduced, thereby significantly reducing the current density required by the first water-cooling copper busbar 12. This significantly reduces the cross-sectional area of ​​the first water-cooling copper busbar, significantly reducing the amount of copper busbar used for the first water-cooling copper busbar 12 and lowering its cost.

[0077] Correspondingly, since the rectifier cabinet also uses two output terminals 15, the cross-sectional area of ​​the second water-cooling copper busbar 14 will be greatly reduced, which greatly reduces the usage of the copper busbar and further reduces the manufacturing cost of the rectifier transformer.

[0078] Example 3

[0079] See also Figure 6 In some embodiments of the present application, a rectifier unit is provided, which is used to supply power to a graphitization furnace.

[0080] The rectifier unit includes: a power supply device, a short-circuit grid, and any rectifier transformer in some of the above embodiments. The input and output ends of the rectifier transformer are electrically connected to the power supply device and the short-circuit grid respectively.

[0081] After the power supply device takes power, the rectifier transformer converts it into the direct current required for the actual scenario, and inputs it into the graphitization furnace through the short-circuit grid to provide energy for the baking of the conductive electrodes in the graphitization furnace.

[0082] The rectifier unit of the present application adopts the rectifier transformer of the above embodiment. Since the amount of copper bars used in the rectifier cabinet of the rectifier transformer is greatly reduced, the use cost of the rectifier unit is greatly reduced.

[0083] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of this application.

Claims

1. A rectifier cabinet, characterized in that: A rectifier circuit is provided therein, comprising: a first water-cooled copper bar, a second water-cooled copper bar and a plurality of rectifier arms, wherein the plurality of rectifier arms are arranged in parallel between the first water-cooled copper bar and the second water-cooled copper; The rectifier circuit is provided with a plurality of input terminals on the AC side and an output terminal on the DC side, and the plurality of input terminals are connected to the first water-cooling copper busbar. The AC power enters the rectifier circuit through the plurality of input terminals, is converted into DC power by the rectifier arm, and then leaves the rectifier circuit through the output terminal.

2. The rectifier cabinet according to claim 1, characterized in that: The rectifier circuit is provided with a plurality of output terminals on the DC side, and the plurality of output terminals are connected to the second water-cooling copper busbar.

3. The rectifier cabinet according to claim 2, characterized in that: The rectifier circuit includes: two input terminals and two said output terminals, the two said input terminals are arranged at intervals from each other, and the two said output terminals are arranged at intervals from each other.

4. The rectifier cabinet according to claim 1, characterized in that: The output terminals and the output terminals are both flat.

5. The rectifier cabinet according to claim 1, characterized in that: The rectifier arm includes: a diode and a fuse, the diode is connected to the fuse, and the diode is configured to only allow current to flow from the input terminal to the output terminal; the fuse is arranged downstream of the diode in the current flow direction.

6. The rectifier cabinet according to claim 1, characterized in that: The first water-cooling copper busbar includes a copper busbar body and a water-cooling pipe, and the water-cooling pipe is arranged in contact with the copper busbar body.

7. The rectifier cabinet according to claim 1, characterized in that: The first water-cooling copper bar and the second water-cooling copper bar are arranged parallel to each other and spaced apart.

8. A rectifier transformer, characterized in that: include: A transformer body and a rectifier cabinet according to any one of claims 1 to 7, wherein the rectifier cabinet is electrically connected to the transformer.

9. The rectifier transformer according to claim 8, characterized in that: The AC side of the transformer body is provided with a plurality of AC side terminals, and the number of the AC side terminals is the same as the number of input terminals of the rectifier cabinet.

10. A rectifier unit, characterized in that: Including the rectifier transformer according to claim 8 or 9.

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