Rectifier cabinet, rectifier transformer and rectifier unit

Abstract

The invention 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. The rectifier cabinet has an AC side and a DC side. The rectifier cabinet has a built-in rectifier circuit. The rectifier circuit obtains current from the outside world on the AC side and then outputs the converted DC current to the outside world from 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 is 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 the present application is to provide a rectifier cabinet, a rectifier transformer and a rectifier unit, which can reduce the copper busbar consumables 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, wherein the rectifier circuit comprises: 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 output terminals on the DC side, and the plurality of input terminals are connected to the first water-cooled copper busbar, wherein the AC power enters the rectifier circuit through the plurality of input terminals respectively, and is converted into DC power through 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 output terminals, the two input terminals are arranged to be spaced apart from each other, and the two output terminals are arranged to be 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 diode in the current flow direction.

[0013] Optionally, the first water-cooling copper busbar comprises: 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 is a rectifier transformer, 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.

[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. The AC enters the rectifier circuit via the several input terminals, and selects a rectifier bridge to pass through with the closest distance to the output terminal. All rectifier bridges are distributed to the several input terminals, that is, the number of rectifier bridges distributed to the AC input via each input terminal is greatly reduced, the cross-sectional area of ​​the first water-cooled copper bar is determined according to the current density of the AC that distributes the most rectifier bridges, the current density required by the first water-cooled copper bar is greatly reduced, and thus the cross-sectional area of ​​the first water-cooled copper bar is greatly reduced, the amount of copper bar used for the first water-cooled copper bar is greatly reduced, and the use cost of the rectifier cabinet is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

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

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

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

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

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

[0026] Figure 6 A schematic structural diagram of a rectifier unit according to some embodiments of the present application is shown.

[0027] Description of main component symbols:

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

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

[0030] In addition, the technical features involved in 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 with 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. The rectifier cabinet has an AC side and a DC side. The AC side is used to obtain current from the outside world, and the DC side is used to output the converted DC current to the outside world.

[0032] See also Figure 1The conventional technology discloses a rectifier cabinet 10. The rectifier cabinet 10 is provided with a rectifier circuit, which includes a first water-cooled copper bar 12, a second water-cooled copper bar 14 and a plurality of rectifier arms 13. The first water-cooled copper bar 12 and the second water-cooled copper bar 14 are parallel to each other and arranged at intervals, and the plurality of rectifier arms 13 are arranged in parallel with the first water-cooled copper bar 12 and the second water-cooled copper bar 14.

[0033] The two sides of the rectifier circuit are respectively connected to an output terminal 15 and an input terminal 11. The alternating current enters the rectifier circuit from the input terminal 11, and is rectified by the rectifier circuit and then output from the output terminal 15 in the form of direct current.

[0034] Specifically, the AC power is first input into the rectifier circuit through the input terminal 11 , and then propagates in two directions on the first water-cooled 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-cooled 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 allocated rectifier bridges. The more rectifier bridges there are, the higher the current density required to be provided by the first water-cooling copper bar 11 is; conversely, the fewer rectifier bridges there are, the lower the current density required is.

[0036] In order to ensure that the alternating current can be transmitted in the rectifier circuit, the cross-sectional area of ​​the first water-cooled 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 use costs.

[0037] Embodiment 1

[0038] In some embodiments of the present application, a rectifier transformer 100 is provided to solve the problem of large amount of copper bars used in the rectifier transformer and high use cost.

[0039] See also Figure 2 and Figure 3 A rectifier circuit and a housing covering the rectifier circuit are arranged in the rectifier cabinet 10. During the 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 the DC side are located on opposite sides of the rectifier circuit. Figure 2The 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 the device that emits AC power so that the outside world can input AC power into the rectifier cabinet 10; the DC side is used to connect the device that emits DC power so that it can be converted into DC power by the rectifier circuit and output to the outside world.

[0042] Specifically, the rectifier circuit includes: a first water-cooled copper bar 12, a second water-cooled copper bar 14 and a plurality of rectifier arms 13. The first water-cooled copper bar 12 and the second water-cooled 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-cooled copper bar 12 and the second water-cooled 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, so as to fully utilize the space and reduce the volume of the rectifier cabinet.

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

[0045] In the rectifier cabinet of the present application, the rectifier circuit arranged 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. The AC 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 AC 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 AC that distributes the most rectifier bridges, and the current density required by the first water-cooled copper bar 12 is greatly reduced, so that the cross-sectional area of ​​the first water-cooled copper bar is greatly reduced, and the copper bar used for the first water-cooled copper bar 12 is greatly reduced, and the use cost is low.

[0046] Furthermore, when the numbers of rectifier bridges corresponding to the alternating current entering the rectifier circuit from a number 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 current of more rectifier bridges.

[0047] To further illustrate the principle, an actual example is used for illustration. The total current density of the input rectifier circuit is i, and two input terminals 11 are provided on the AC side of the rectifier circuit, and each input terminal is split into 0.5i to enter the rectifier circuit.

[0048] Among them, ten rectifier arms 13 are arranged in parallel between the first water-cooled copper bar 12 and the second water-cooled copper bar 14 of the rectifier circuit. The two input terminals 11 are arranged at intervals from each other, and each input terminal 11 corresponds to five rectifier bridges, so that the distance for the alternating current to reach the output terminal 15 through the five rectifier bridges is the shortest. For example: three rectifier arms 13 are arranged on one side of the input terminal 11, and two rectifier arms 13 are arranged on the other side.

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

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

[0051] The input terminal 11 and the output terminal 15 are arranged in a "bottom-in and top-out" manner, the input terminal 11 is located at a position slightly lower than the AC side of the rectifier cabinet 10, and the output terminal 15 is located at a position slightly higher than the DC side of the rectifier cabinet 10. Specifically: seven rectifier arms 13 are arranged on the upper side of the input terminal 11, and three rectifier arms 13 are arranged on the lower side. The output terminal 15 is arranged at a position slightly higher than the rectifier cabinet 10.

[0052] The current density of the alternating current electrons entering the rectifier circuit from the input terminal 11 is configured as i, and the current is divided into two parts on the first water-cooled copper bar 12, one part of which flows upward along the first water-cooled copper bar 12, and the other part flows downward along the first water-cooled copper bar 12. The seven rectifier bridges 13 corresponding to the upward part of the alternating current have a shunting of 0.7i, and the three rectifier bridges 13 corresponding to the downward part of the alternating current have a shunting of 0.3i. Finally, in order to adapt to the alternating current flowing upward, the first water-cooled copper bar 12 must be set to a cross-sectional area that meets the current density of 0.7i.

[0053] In summary, when only the number of input terminals 11 and output terminals 15 is changed and other conditions are the same, the cross-sectional area of ​​the first water-cooling copper bar 12 in the present 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. Through the above case, it can be more intuitively concluded that reducing the cross-sectional area of ​​the first water-cooling copper bar 12 can reduce 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 will not be repeated.

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

[0056] As an alternative implementation, the AC side of the rectifier circuit may also use only one input terminal 11 and a plurality of output terminals 15 on the DC side, 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 arranged at a certain distance, and the two output terminals 15 are arranged at a distance from each other. The two input terminals 11 are arranged at a distance from each other to avoid self-inductance before the AC enters the rectifier circuit, so as to ensure the stability of the AC input to the rectifier circuit. Correspondingly, the two output terminals 15 are arranged at a distance from each other, which can reduce the self-inductance when the DC is output by the two output terminals 15, so as to ensure the stability of the DC output of 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 body to relieve the overheating state of the copper busbar body 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 bar body can be configured to be hollow, and the cooling pipe runs through the copper bar body, so that the copper bar body can have a larger contact area with the cooling pipe, which can improve the heat exchange effect of cooling water. Alternatively, the cooling pipe is directly fixed on one side of the copper bar body, or the cooling pipe is wound around the copper bar body in an S-shaped manner.

[0064] In addition, the copper busbar body can be a cylinder or a 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 and other conductors. Compared with ordinary copper bars, water-cooled copper bars have better heat dissipation effect and can have a larger cross-sectional area, so as to be 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, and the inductance affects the magnitude of the current transmitted on each rectifier arm 13 to varying degrees. That is, 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 the 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] Embodiment 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 comprises: 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 . An AC copper bus 30 is connected between the transformer body 20 and the two rectifier cabinets 10 .

[0074] The AC side of the transformer body 20 is provided with two AC side terminals 21, which are connected to the input terminal 11 of the rectifier cabinet through an AC copper busbar. The current first enters the transformer body 20 from the outside, and the transformer body 20 adjusts the voltage of the AC power to be suitable for actual use in the actual scene through the transformer action, and then the AC copper busbar 30 is transmitted to the rectifier cabinet to change the direction of the AC power and convert it into DC power.

[0075] Since the rectifier cabinet 10 uses two input terminals 11 , the transformer body 20 is correspondingly provided with an AC side terminal 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 adopts the rectifier cabinet 10 and the transformer body 20 of the above embodiment, and the alternating current enters the rectifier circuit of the rectifier cabinet 10 through the transformer body 20, and selects the rectifier bridge to pass through with the closest distance to the output terminal 15. The alternating current enters from a number of input terminals 11 and is distributed to all the rectifier bridges 13, that is, the number of rectifier bridges distributed to the alternating current input through each input terminal 11 is reduced, so the current density required by the first water-cooling copper bar 12 is greatly reduced, so that the cross-sectional area of ​​the first water-cooling copper bar is greatly reduced, and the use amount of the copper bar used for the first water-cooling copper bar 12 is greatly reduced, and the use cost is low.

[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] Embodiment 3

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

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

[0081] After the power-taking 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 graphitization furnace to bake the conductive electrodes.

[0082] The rectifier unit of the present application adopts the rectifier transformer of the above-mentioned 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 the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom still fall within the scope of protection created by this application.

Claims

1. A rectifier cabinet, characterized in that: A rectifier circuit is arranged 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; The rectifier circuit is provided with a plurality of input terminals on the AC side and output terminals on the DC side, and the plurality of input terminals are connected to the first water-cooled copper busbar, wherein the AC power enters the rectifier circuit through the plurality of input terminals respectively, and is converted into DC power through 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 terminal and the output terminal are both flat.

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

6. The rectifier cabinet according to claim 1, characterized in that: The first water-cooling copper busbar comprises: 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: Includes the rectifier transformer described in claim 8 or 9.

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