Electric reactor unit capable of being expanded in series-parallel connection mode and electric reactor

Abstract

The invention provides an electric reactor unit capable of being expanded in series-parallel connection and an electric reactor. The electric reactor unit comprises a winding type sheet-shaped iron core, the double-coil series winding is arranged on the two winding wrapping sections of the winding type sheet iron core in a sleeving manner, and the electric midpoint of the double-coil series winding is in equipotential connection with the winding type sheet iron core; two heat dissipation cantilevers of the C-shaped heat dissipater are respectively attached to the two non-winding wrapping sections of the winding type sheet-shaped iron core; the electrical interface is arranged on the double-coil series winding; according to the electric reactor unit, the sheet structure is formed through the winding type sheet-shaped iron cores, the structure is compact, the insulation distance is small, the design of equipotential connection is combined, it is guaranteed that the electrical stress of the winding type sheet-shaped iron cores between the electric reactor units is low, and the electric reactor unit has the extensible function while the insulation distance is reduced; meanwhile, each winding type sheet-shaped iron core is provided with a C-shaped radiator in a special shape, so that independent heat dissipation of the reactor unit is ensured, and the heat dissipation efficiency is not reduced during cluster work.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric reactors, and particularly relates to a series-parallel expandable electric reactor unit and electric reactor. BACKGROUND

[0002] Thyristor is an important switching element in conventional DC power transmission converter valve, and electric reactor is an important component for protecting thyristor in the converter valve. The main functions of the electric reactor include: showing a large impedance at the instant of thyristor turn-on, thereby inhibiting the too fast growth of turn-on surge current; the electric reactor also plays a certain damping role, avoiding the first valley current zero-crossing during oscillation; with the increase of load current, the electric reactor will gradually saturate, and the impedance after saturation is very small, thus the active and reactive power losses of the converter valve will not be increased. In addition, under the condition of transient impulse overvoltage, the electric reactor will bear most of the peak voltage, thereby reducing the voltage stress of the thyristor.

[0003] The electric reactor is a magnetic element, and in the existing DC power transmission converter valve, one electric reactor can usually protect 4-8 levels of thyristors, and the structure size is large, and the required insulation distance is large, which is not conducive to the layout optimization of the converter valve. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a series-parallel expandable electric reactor unit, which comprises:

[0005] A wound sheet core, the wound sheet core comprises two winding wrapping sections and two non-winding wrapping sections; the winding wrapping sections and the non-winding wrapping sections are arranged alternately;

[0006] A double-coil series winding, the double-coil series winding is sleeved on the two winding wrapping sections, and an electrical midpoint of the double-coil series winding is connected with the wound sheet core at the same potential;

[0007] A C-shaped radiator, the C-shaped radiator comprises two radiating cantilevers and a connecting arm connecting the two radiating cantilevers, and the two radiating cantilevers are respectively attached to the two non-winding wrapping sections;

[0008] A series-parallel expandable electrical interface, the electrical interface is arranged on the double-coil series winding.

[0009] Preferably, the parameters of the wound sheet core and the double-coil series winding are determined according to the number of levels of the thyristor, and the number of levels of the thyristor is 1-2 levels.

[0010] Preferably, the electrical midpoint of the double-coil series winding extends an equipotential connecting line, and the end of the equipotential connecting line away from the double-coil series winding is conductively connected with the wound sheet core.

[0011] Preferably, the double-coil series winding comprises two coil frames and double series coils.

[0012] Two coil frames are sleeved on two winding wrapping sections respectively, the double series coils are wound on the two coil frames, and the electrical interfaces are arranged at two ends of the double series coils.

[0013] Preferably, the winding type sheet core is formed by butt joint of two sheet C-shaped half rings.

[0014] Preferably, the C-shaped radiator is internally provided with a C-shaped water channel, and water inlets and outlets of the water channel are arranged on the connecting arms.

[0015] Based on the same inventive concept, the present application further provides an electric reactor, comprising an insulating base, a plurality of electric reactor units which are insulatively spaced and installed on the insulating base, and an outer shell which wraps the insulating base.

[0016] The plurality of electric reactor units are connected in series or in parallel through electrical interfaces in the electric reactor units.

[0017] The electric reactor unit is the electric reactor unit as described above.

[0018] Preferably, the insulating base is provided with a plurality of insertion slots for insulatively and spacedly inserting and installing the plurality of electric reactor units, and the insertion slots are provided with insertion inlets in at least three insertion directions.

[0019] Preferably, water inlets and outlets of C-shaped radiators in two adjacent electric reactor units are arranged in a staggered manner.

[0020] Preferably, the outer shell is provided with external water channel connectors connected with the water inlets and outlets, and the plurality of C-shaped radiators are connected in series through the external water channel connectors.

[0021] Compared with the closest prior art, the present application has the following beneficial effects:

[0022] This invention provides a series-parallel expandable reactor unit and reactor. The reactor unit includes: a wound lamellar core, the wound lamellar core comprising two winding wrapping sections and two non-winding wrapping sections; the winding wrapping sections and the non-winding wrapping sections are alternately arranged; a double-coil series winding, the double-coil series winding is sleeved on the two winding wrapping sections, the electrical midpoint of the double-coil series winding is equipotentially connected to the wound lamellar core; and a C-type heat sink, the C-type heat sink comprising two heat dissipation cantilever arms and a connecting arm connecting the two heat dissipation cantilever arms, the two heat dissipation cantilever arms being respectively connected to the two non-winding wrapping sections. The reactor unit features a segmented, parallel-extendable electrical interface located on the dual-coil series winding. This unit utilizes a wound-type sheet core to form a sheet structure, resulting in a compact design with small insulation spacing. The design ensures low electrical stress on the wound-type sheet cores between reactor units, reducing insulation spacing while enabling scalability. Furthermore, each wound-type sheet core is equipped with a specially shaped C-type heat sink, ensuring independent heat dissipation for each reactor unit and maintaining efficient heat dissipation even when operating in a cluster. The reactor comprises an insulating base, multiple reactor units mounted on the insulating base with insulating intervals, and a housing encased in the insulating base. Multiple reactor units are connected in series or parallel via electrical interfaces within the reactor units. By encapsulating multiple series- and parallel-extendable reactor units, the overall reactor structure becomes more compact, significantly reducing insulation distance and facilitating optimized converter valve layout. Attached Figure Description

[0023] Figure 1 This is a front structural diagram of the reactor unit provided by the present invention;

[0024] Figure 2 A schematic diagram of the back structure of the reactor unit provided by the present invention;

[0025] Figure 3 This is a schematic diagram showing the positional relationship of multiple inlet and outlet water ports in the reactor provided by the present invention.

[0026] Figure 4 This is a schematic diagram of the series expansion connection of multiple reactor units in the reactor provided by the present invention;

[0027] Figure 5 A schematic diagram of the parallel expansion connection of multiple reactor units in the reactor provided by the present invention. Figure 1 ;

[0028] Figure 6 A schematic diagram of the parallel expansion connection of multiple reactor units in the reactor provided by the present invention. Figure 2 ;

[0029] Figure 7 This is a schematic diagram of the first assembly process of the reactor provided by the present invention;

[0030] Figure 8 This is a schematic diagram of the second assembly process of the reactor provided by the present invention;

[0031] Figure 9 This is a schematic diagram of the third assembly process of the reactor provided by the present invention;

[0032] Figure 10 This is a schematic diagram of the fourth assembly process of the reactor provided by the present invention;

[0033] Among them, 1. Winded sheet iron core; 2. Double coil series winding; 2-1. Coil frame; 2-2. Double series coil; 3. C-type radiator; 4. Equipotential bonding wire; 5. Insulating base; 6. Outer shell; 7. Slot; 8. External water channel connector; 9. Inlet and outlet water inlet; 10. Pressure block; 11. Inlet and outlet terminals. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] Example 1:

[0036] This invention provides a reactor unit that can be extended in series and parallel, such as... Figure 1 As shown, it includes:

[0037] A wound sheet iron core 1, wherein the wound sheet iron core 1 includes two winding wrapping sections and two non-winding wrapping sections; the winding wrapping sections and the non-winding wrapping sections are arranged alternately;

[0038] A double-coil series winding 2 is sleeved on two winding wrapping sections, and the electrical midpoint of the double-coil series winding 2 is equipotentially connected to the wound sheet iron core 1.

[0039] C-type radiator 3, the C-type radiator 3 includes two heat dissipation cantilever arms and a connecting arm connecting the two heat dissipation cantilever arms, the two heat dissipation cantilever arms respectively fit into the two non-winding wrapping sections;

[0040] An electrical interface that can be expanded in series and parallel, the electrical interface being disposed on the dual-coil series winding 2.

[0041] The reactor unit of the present application forms a sheet structure by the winding sheet core 1, which is compact in structure and small in insulation distance, and combines the winding sheet core 1 potential inside the reactor unit with the intermediate potential of the double-coil series winding 2, so as to ensure that the electrical stress of the winding sheet core 1 between the reactor units is low, form a low-voltage stress reactor unit, and make the reactor unit have expandable functions while reducing the insulation distance. At the same time, by providing each winding sheet core 1 with a special-shaped C-shaped radiator 3, the radiator unit is ensured to have independent heat dissipation and the heat dissipation efficiency does not decrease when working in clusters.

[0042] It should be noted that the winding sheet core 1 is of a winding structure, the inner window is rectangular, and the sheet core is thinner than the conventional reactor core, which is beneficial to stacking expansion. The two winding wrapping sections are two parallel core sections, which are convenient for subsequent winding installation.

[0043] It should be noted that, in order to improve the temperature rise of the reactor, a radiator is installed in each reactor unit, as shown in Figure 2 The radiator is formed in a C shape, that is, a C-shaped radiator 3, and the upper and lower sides of the C-shaped radiator 3 are attached to the upper and lower sides of the winding sheet core 1 which are not wrapped by the coil winding, that is, the two said heat dissipation cantilevers are attached to the two said non-winding wrapping sections respectively. In order to ensure good attachment of the radiator and the core, the C-shaped radiator 3 and the winding sheet core 1 are pressed by a pressing block 10, which is connected to the C-shaped radiator 3 by a screw, which can effectively reduce the contact thermal resistance between the radiator and the core, ensure that the heat is quickly and efficiently conducted to the radiator waterway, thereby significantly improving the heat dissipation efficiency of the unit, controlling the temperature rise, and ensuring the long-term stable operation of the reactor under high temperature. At the same time, two waterway interfaces, that is, water inlets and outlets 9, are provided on the connecting arms of the C-shaped radiator 3, which are responsible for water inlet and outlet respectively.

[0044] Considering that a whole reactor in the existing DC engineering converter valve usually protects 4-8 thyristors, the structure size is large, the required insulation distance is large, and it is not conducive to the layout optimization of the converter valve. Developing a compact reactor with small parameters is of great significance to simplify the design process of the converter valve. The present application proposes to decompose the electrical parameters of the reactor, use small parameters to make reactor units, and then customize the assembly through series or parallel connection, which can effectively increase the space utilization of the reactor. The units can be mass-produced and standardized, which significantly improves the production efficiency and consistency and reliability of the products.

[0045] In the embodiment, the parameters of the winding sheet core 1 and the double-coil series winding 2 are determined according to the number of thyristors, and the number of thyristors is 1-2.

[0046] It should be noted that when designing the number of thyristors corresponding to the specific stage, the parameters to be considered include: inductance value, saturation characteristic, frequency characteristic, volt-second product, etc. These parameters are changed by changing the structure design of the wound sheet core 1 and the double-coil series winding 2.

[0047] For a series thyristor stage with a large number of stages, a plurality of reactor units can be connected in series or parallel and then sealed by pouring glue to form a customized reactor, which can not only customize the reactor structure according to different parameter needs, but also effectively reduce the space occupation of the reactor.

[0048] In this embodiment, the electrical midpoint of the double-coil series winding 2 extends an equipotential connection line 4, and the end of the equipotential connection line 4 away from the double-coil series winding 2 is conductively connected to the wound sheet core 1.

[0049] It should be noted that the traditional reactor core is usually at a high potential or requires complex insulation. The present application realizes low voltage stress characteristics by making the wound sheet core 1 and the electrical midpoint of the double-coil series winding 2 equipotential, significantly reducing the insulation requirement between units, and making it possible to tightly stack multiple units.

[0050] In this embodiment, the double-coil series winding 2 includes two coil skeletons 2-1 and a double series coil 2-2.

[0051] The two coil skeletons 2-1 are respectively sleeved on the two winding wrapping sections, the double series coil 2-2 is wound on the two coil skeletons 2-1, and the electrical interface is arranged at the two ends of the double series coil 2-2.

[0052] It should be noted that the double series coil 2-2 adopts a double-coil series structure, each coil is wound on two coil skeletons 2-1, the terminals of the two coils of the double series coil 2-2 are connected in series, and each coil has one terminal lead line, which is used as or connected to the expandable electrical interface. The entire double series coil 2-2 and coil skeleton 2-1 are poured into one whole body with insulating material to form a double-coil series winding 2, which is then assembled on the wound sheet core 1. The pre-pouring operation of the double series coil 2-2 and the coil skeleton 2-1 can enhance the mechanical strength, improve the internal heat dissipation, provide preliminary insulation inside the unit, and ensure the stability and consistency of each unit itself, facilitating subsequent series and parallel expansion.

[0053] In this embodiment, the wound sheet core 1 is formed by butt joint of two sheet C-shaped half rings.

[0054] It should be noted that the two winding wrapping sections and the two non-winding wrapping sections of the winding type sheet core 1 are functionally divided, and in order to be more convenient in the subsequent assembly process of the winding type sheet core 1, in the actual structure, the winding type sheet core 1 is designed in a split butt joint manner, in the assembly, one sheet-shaped C-shaped half ring is inserted into the frame body of the coil skeleton 2-1 from top to bottom, and the other sheet-shaped C-shaped half ring is inserted into the frame body of the coil skeleton 2-1 from bottom to top, and the butt joint is completed in the frame body of the coil skeleton 2-1, and the double coil series winding 2 is integrally cast, without on-site winding of the coil, so that the assembly efficiency is greatly improved.

[0055] In the embodiment, the C-shaped radiator 3 is internally provided with a C-shaped water channel, and the water inlet and outlet 9 of the water channel is arranged on the connecting arm.

[0056] It should be noted that the C-shaped water channel is matched with the shape of the C-shaped radiator 3, the connecting arm is suspended outside the winding type sheet core 1, the width of the connecting arm is smaller than the width of the heat dissipation suspension arm, and the connecting arm mainly serves to connect the water channels in the two heat dissipation suspension arms and to arrange the water inlet and outlet 9.

[0057] Embodiment 2:

[0058] Based on the same inventive concept, the application further provides an electric reactor, as shown in the accompanying drawings, comprising an insulating base 5, a plurality of electric reactor units which are insulatively spaced apart on the insulating base 5, and a shell 6 which wraps the insulating base 5. Figures 3-10

[0059] The plurality of electric reactor units are connected in series or in parallel through the electrical interfaces in the electric reactor units.

[0060] The electric reactor unit is the electric reactor unit in the above embodiment.

[0061] Considering that the original conventional DC converter valve structure is generally configured with one electric reactor for a plurality of thyristors, the operating voltage and the insulation level of the electric reactor are high, which causes large weight and bulky size. The electric reactor structure provided by the application disassembles the electrical parameters, encapsulates a plurality of electric reactor units which can be expanded in series or in parallel, reduces the electrical stress, greatly reduces the insulation distance, makes the size more compact, is beneficial to the layout optimization of the converter valve, and can also realize customized configuration of the electric reactor in different application scenarios.

[0062] As shown in the accompanying drawings, in the embodiment, the water inlets and outlets 9 of the C-shaped radiators 3 in the two adjacent electric reactor units are arranged in a staggered manner. Figure 3

[0063] ​​It should be noted that by staggered distribution of the water inlets and outlets 9 of adjacent C-shaped radiators 3, the insulation distance between units is ensured, high-efficiency heat dissipation is realized in a compact space, and heat dissipation deterioration caused by module stacking is avoided.

[0064] Taking a reactor composed of four groups of reactor units in series as an example, one C-shaped radiator 3 cooperates with one wound sheet core 1 and double-coil series winding 2 on the core to form one reactor unit, there are two kinds of C-shaped radiators 3, the water inlets of adjacent two kinds of C-shaped radiators 3 are staggered to form a staggered distribution, so that the reactor units have sufficient insulation distance. Figure 4 As shown in the figure, the coil terminals at both ends of the series coils are respectively used as the inlet end and the outlet end, so that the four groups of reactor units form the internal structure of the reactor.

[0065] If the reactor is composed of parallel expansion mode, taking four groups of reactor units in parallel as an example, as shown in the figures, Figure 5 and Figure 6 the coil windings between the reactor units are connected in parallel, and the four cores are at the same potential. The remaining structure is consistent with that of the reactor composed of series expansion mode.

[0066] In this embodiment, a plurality of insertion slots 7 for inserting and mounting a plurality of reactor units in an insulated manner are formed on the insulating seat 5, and the insertion slots 7 have at least three insertion directions.

[0067] It should be noted that the number of insertion slots 7 is the same as the number of reactor units in the reactor.

[0068] It should be noted that in order to facilitate the installation of the C-shaped radiator 3, the wound sheet core 1 and the double-coil series winding 2 in the insulating seat 5, as shown in the figure, Figure 7 two insertion slots 7 are formed on the insulating seat 5, and the insertion slots 7 have at least three insertion directions. The upper and lower insertion slots are convenient for inserting the wound sheet core 1 and the double-coil series winding 2, and the side wall insertion slot is convenient for inserting the C-shaped radiator 3 from the side, so that the structure after assembly is more compact.

[0069] In this embodiment, the housing 6 is provided with an external waterway connecting piece 8 connected with the water inlets and outlets 9, and a plurality of C-shaped radiators 3 are connected in series through the external waterway connecting piece 8.

[0070] Taking a reactor composed of four groups of reactor units in series as an example, the installation sequence of the reactor of the present application is as follows:

[0071] S1. As shown in the figure, Figure 7 the required coils are wound on eight coil skeletons 2-1, the coils are connected in series, double series coils 2-2 are formed, and then the whole is assembled into the insulating seat 5;

[0072] S2. As shown in Figure 8 The winding sheet core 1 is formed by two sheet C-shaped half rings which are connected in a butt joint manner, and the winding sheet core 1 is inserted into the gap of the coil frame 2-1 in a butt joint manner;

[0073] S3. As shown in Figure 9 The C-shaped radiator 3 is inserted from the side of the insulating base 5, and the pressing block 10 is installed to clamp the C-shaped radiator 3 and the winding sheet core 1;

[0074] S4. As shown in Figure 10 The shell 6 of the reactor is installed, the shell 6 is divided into an upper cover and a lower cover, the lower cover is provided with the in-out terminal 11 of the coil and a mounting threaded hole; after the shell 6 is installed, the cavity is filled with glue for encapsulation, the internal gap of the reactor is filled with the insulating material, and finally the external water connection component 8 such as a water pipe is installed, so that a complete reactor is obtained.

[0075] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit the protection scope thereof, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that: after reading the present application, those skilled in the art can still make various changes, modifications or equivalent replacements to the specific embodiments of the application, but these changes, modifications or equivalent replacements are all within the protection scope of the claims of the present application.

Claims

1. A reactor unit which can be expanded in series and in parallel, characterized in that, It comprises: A wound sheet core (1) comprising two winding wrapping sections and two non-winding wrapping sections; the winding wrapping sections are arranged alternately with the non-winding wrapping sections; A double-coil series winding (2) sleeved on two winding wrapping sections, the electrical midpoint of the double-coil series winding (2) is connected with the wound sheet core (1) at the same potential; A C-shaped radiator (3) comprising two radiating cantilevers and a connecting arm connecting the two radiating cantilevers, and the two radiating cantilevers are respectively attached to two non-winding wrapping sections; A series-parallel expandable electrical interface provided on the double-coil series winding (2).

2. The reactor unit of claim 1, wherein, The parameters of the wound sheet core (1) and the double-coil series winding (2) are determined according to the number of thyristors, and the number of thyristors is 1-2.

3. The reactor unit of claim 1 or 2, characterized in that The electrical midpoint of the double-coil series winding (2) extends an equipotential connection line (4), and one end of the equipotential connection line (4) away from the double-coil series winding (2) is conductively connected with the wound sheet core (1).

4. The reactor unit of claim 1 or 2, characterized in that The double-coil series winding (2) comprises two coil skeletons (2-1) and double series coils (2-2); Two coil skeletons (2-1) are respectively sleeved on two winding wrapping sections, double series coils (2-2) are wound on two coil skeletons (2-1), and the electrical interface is arranged at both ends of the double series coils (2-2).

5. The reactor unit of claim 4, wherein, The wound sheet core (1) is formed by butt joint of two sheet C-shaped half rings.

6. The reactor unit of claim 1 or 2, wherein The C-shaped radiator (3) is internally provided with a C-shaped water channel, and the water inlet and outlet (9) of the water channel is arranged on the connecting arm.

7. A reactor, characterized by It comprises: An insulating seat (5), a plurality of reactor units insulatively spaced mounted on the insulating seat (5), and an outer shell (6) wrapped outside the insulating seat (5); A plurality of reactor units are connected in series or parallel through the electrical interfaces in the reactor units; The reactor unit is the reactor unit according to any one of claims 1-6.

8. The reactor of claim 7, wherein A plurality of insertion slots (7) for insulatively and separately inserting and mounting a plurality of reactor units are formed on the insulating seat (5), and the insertion slots (7) have at least three insertion direction insertion openings.

9. The reactor of claim 7, wherein The water inlets and outlets (9) of the C-shaped radiators (3) in two adjacent reactor units are arranged in a staggered manner.

10. The reactor of claim 9, wherein The outer shell (6) is provided with an external water channel connecting piece (8) connected with the water inlets and outlets (9), and a plurality of C-shaped radiators (3) are connected in series through the external water channel connecting piece (8).

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