Annular water-cooled reactor

Abstract

The invention relates to the technical field of electric reactors, and discloses an annular water-cooled electric reactor which comprises a coil assembly, a filling ring, an insulating tube and a potting colloid. The coil assembly comprises a conducting bar, a water joint and a coil body; the coil body is a hollow pipe which is hollow inside, the hollow pipe is wound on the filling ring to form a plurality of groups of coils, and water joints are arranged at two ends of the coil body; an insulating tube is arranged at the rotation center of the filling ring; and the coil assembly, the filling ring and the insulating tube are externally filled with a potting colloid. By arranging the coil assembly, the filling ring and the potting colloid, the coil is integrally welded and formed, the potting colloid structure is matched, the mechanical strength is high, the capacity of the reactor for bearing instantaneous pulse large current is high, the partial discharge phenomenon is reduced, the process execution difficulty and cost are reduced under the condition that the strength and quality of the reactor are improved, and the production efficiency is improved. The light weight of the annular water-cooled reactor is achieved, and the anti-cracking capacity of the rubber layer during internal cooling and heating alternation is systematically improved through raw materials, structural design and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of reactors, and in particular to an annular water-cooled reactor. Background Art

[0002] The ring-shaped water-cooled reactor is a DC reactor, which is mainly used in the filter circuit on the output side of the rectifier circuit. Its main function is to limit the current change rate, reduce harmonic interference, improve the power factor and improve the input current waveform, and protect the inverter in the rectifier circuit. However, the cooling water of the current reactor is shared with the cooling circuit of the main converter circuit, and the water temperature varies greatly. The coil and the potting colloid are prone to cracking and stratification. In addition, most of the similar water-cooled reactors in the related technology have large internal cavities, partial discharge, easy cracking of the glue layer, and low mechanical strength. They are also heavy and not conducive to lightweighting.

[0003] Therefore, there is an urgent need to provide a ring-shaped water-cooled reactor to solve the problems existing in the prior art. Summary of the invention

[0004] The object of the present invention is to provide a ring-shaped water-cooled reactor with good performance and long service life, and the specific technical scheme thereof is as follows:

[0005] A ring-shaped water-cooled reactor comprises a coil assembly, a filling ring, an insulating tube and a potting colloid;

[0006] The coil assembly includes a conductive bar, a water joint and a coil body; the coil body is a hollow tube with a hollow interior, and the hollow tube is wound on a filling ring to form multiple groups of coils, and water joints are arranged at both ends of the coil body, and the water joints are fixedly arranged on the conductive bar;

[0007] An insulating tube is arranged at the rotation center of the filling ring, and the insulating tube is arranged perpendicular to the plane where the filling ring is located;

[0008] The coil assembly, the filling ring and the insulating tube are filled with potting colloid outside, and a part of the conductive row and the water joint is exposed from the potting colloid.

[0009] Preferably, the coil body is made of aluminum alloy profile, the material of the aluminum alloy profile is 6 series hard aluminum alloy, and the conductive bar, water joint and coil body are connected by welding;

[0010] The outer contour of the cross section of the hollow tube of the coil body is a square, and the four corners of the square are rounded.

[0011] Preferably, the conductive bar is provided with a plurality of through holes, some of which are used for installing insulating plates, and the remaining through holes are used for connecting to an external power source;

[0012] The insulating plate is made of epoxy glass cloth and is used to position and fix the conductive bar.

[0013] Preferably, the thickness of the conductive bar is consistent with the outer diameter of the hollow tube of the coil body, and the width of the conductive bar is one third of the total height of the coil body.

[0014] Preferably, the filling ring is formed by four quarter-circle rings connected to each other, and the filling ring is made of a foaming material having the same expansion coefficient as the potting colloid.

[0015] Preferably, it also includes insulating paper arranged between the coils of the coil body for insulation, and the insulating paper includes multiple layers of whole sheets of NOMEX insulating paper.

[0016] Preferably, it also includes a binding tape for binding the insulating paper and the coil body, and the binding tape is an alkali-free glass ribbon.

[0017] Preferably, it further comprises a mesh cloth wrapped outside the coil body, wherein the mesh cloth is a mesh-shaped epoxy resin glass fiber cloth;

[0018] The mesh cloth is fixed outside the coil body by means of a glass ribbon and a glass ribbon adhesive tape with adhesive on one side.

[0019] Preferably, the insulating tube is made of epoxy glass cloth tube, and a potting colloid is filled between the insulating tube and the bound coil body.

[0020] Preferably, the material of the potting colloid is polyurethane, and the potting colloid comprises a positioning hole, a mounting plane, an arc surface, an external transition surface and a conical surface formed by integral casting; the positioning hole, the mounting plane, the arc surface, the external transition surface and the conical surface together constitute the outer facade of the potting colloid;

[0021] The positioning hole is arranged on the installation plane, and is used for positioning the reactor in the circumferential direction and fixing the clamping iron plate on the reactor; the external transition surface is used for transitionally connecting the arc surface and the conical surface; the conical surface is used for facilitating the demoulding of the casting mold after potting, and the transition between the two conical surfaces is smooth and stress concentration-free.

[0022] The application of the technical solution of the present invention has the following beneficial effects:

[0023] A ring-shaped water-cooled reactor comprises a coil assembly, a filling ring, an insulating tube and a potting colloid; the coil assembly comprises a conductive bar, a water joint and a coil body; the coil body is a hollow tube with a hollow interior, and the hollow tube is wound on the filling ring to form a plurality of coils, and water joints are arranged at both ends of the coil body, and the water joints are fixedly arranged on the conductive bar; an insulating tube is arranged at the rotation center of the filling ring, and the insulating tube is arranged perpendicular to the plane where the filling ring is located; the outside of the coil assembly, the filling ring and the insulating tube is filled with a potting colloid, and a part of the conductive bar and the water joint is exposed from the potting colloid. The annular water-cooled reactor of the present invention comprises a formed and welded coil assembly, a filling ring and an optimized potting colloid structure, wherein the coil is formed by integral welding, and the potting colloid structure has high mechanical strength, so that the reactor has a strong ability to withstand instantaneous pulse large currents and reduces local discharge. While improving the mechanical strength and quality of the reactor, the difficulty and cost of process execution are reduced, and the lightweight of the annular water-cooled reactor is achieved. At the same time, through the combination of raw materials, structural design, etc., the ability of the glue layer to resist cracking during internal alternation of hot and cold is systematically improved.

[0024] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 It is a schematic diagram of the overall structure of an annular water-cooled reactor of the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of the assembly structure of the coil assembly, filling ring and insulating tube of the medium annular water-cooled reactor;

[0028] Figure 3 for Figure 1 Schematic diagram of the structure without the external potting colloid;

[0029] Figure 4 Schematic diagram of the filling ring structure.

[0030] In the figure: 1. Coil assembly, 1.1. Conductive bar, 1.2. Water joint, 1.3. Coil body; 2. Filling ring, 2.1. Quarter ring; 3. Insulation tube; 4. Potting colloid, 4.1. Positioning hole, 4.2. Installation plane, 4.3. Arc surface, 4.4. External transition surface, 4.5. Conical surface; 5. Insulation paper; 6. Binding tape; 7. Mesh cloth; 8. Glass ribbon; 9. Glass fiber tape; 10. Insulation board. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0032] refer to Figure 1 A ring-shaped water-cooled reactor comprises a coil assembly 1, a filling ring 2, an insulating tube 3 and a potting colloid 4; the coil assembly 1 comprises a conductive bar 1.1, a water joint 1.2 and a coil body 1.3; the coil body 1.3 is a hollow tube with a hollow interior, and the hollow tube is wound on the filling ring 2 to form a plurality of coils, and water joints 1.2 are arranged at both ends of the coil body 1.3, and the water joints 1.2 are fixedly arranged on the conductive bar 1.1; an insulating tube 3 is arranged at the rotation center of the filling ring 2, and the insulating tube 3 is arranged perpendicular to the plane where the filling ring 2 is located; the outside of the coil assembly 1, the filling ring 2 and the insulating tube 3 is filled with a potting colloid 4, and a part of the conductive bar 1.1 and the water joint 1.2 are exposed from the potting colloid 4.

[0033] The annular water-cooled reactor of the present embodiment has structures such as a formed and welded coil assembly, a filling ring and an optimized potting colloid, wherein the coil assembly is welded in one piece and has high mechanical strength, so that the reactor has a strong ability to withstand instantaneous pulse large currents and reduces local discharge. By coordinating the potting colloid structure, the mechanical strength and quality of the reactor are improved, the difficulty and cost of process execution are reduced, and the lightweight of the annular water-cooled reactor is achieved. At the same time, through the combination of raw materials, structural design, etc., the ability of the glue layer to resist cracking during internal alternation of hot and cold is systematically improved.

[0034] refer to Figure 2 The coil body 1.3 is made of aluminum alloy profile, and the aluminum alloy profile is selected as 6 series hard aluminum alloy. The conductive bar 1.1, the water joint 1.2 and the coil body 1.3 are connected by welds; the outer contour of the cross section of the hollow tube of the coil body 1.3 is square, and the four corners of the square are rounded.

[0035] The conductive bar 1.1 is provided with a plurality of through holes, some of which are used to install the insulating plate 10, and the remaining through holes are used to connect to an external power source; the insulating plate 10 is made of epoxy glass cloth board, which is used to position and fix the conductive bar 1.1, thus improving the ability to withstand instantaneous pulse large current.

[0036] The thickness of the conductive bar 1.1 is consistent with the outer diameter of the hollow tube of the coil body 1.3, and the width of the conductive bar 1.1 is one third of the total height of the coil body 1.3.

[0037] The inner hole of the water joint is connected to the inner hole of the coil body, and is connected to the external water circuit by an internal thread. The external cooling deionized water is passed from the water joint into the coil body and then out through the water joint to form a cooling circuit. The coil body does not need to be insulated, the coil production process is simple, and there is no safety and quality risk caused by the shedding of the insulation layer. When the reactor is powered on, the cooling water continuously takes away the internal heat and plays a role in water cooling and heat dissipation. The coil body is drawn from aluminum alloy, with a hole in the center of the cross section for cooling water circulation, and the cross section is rounded around. The function of the rounded corners is to optimize the electric field distribution, reduce the electric field concentration and local discharge caused by sharp corners, reduce the heat accumulation of sharp corners, and reduce the damage of sharp corners to the potting colloid structure, thereby improving the overall mechanical strength. The production process of the coil body is as follows: the drawn wire is subjected to a heat softening treatment, first wound into a multi-turn hollow coil, and then bent into a ring as a whole, reducing the damage to the surface of the aluminum alloy profile by the tooling mold during the forming process, and avoiding fine cracks in the inner cavity. After bending, it is welded into a whole, and after welding, the whole is heat treated to make the coil hard as a whole. Its annular structure and conductive bar have good strength and are capable of withstanding instantaneous pulse large current.

[0038] refer to Figure 3 The filling ring 2 is composed of four quarter-circular rings 2.1 connected to each other to form a circular ring. The assembled filling ring is easy to install and disassemble; and its material is a foam material that is consistent with the expansion coefficient of the potting colloid 4. The cross-sectional shape is consistent with the inner cavity of the coil body. When in use, the two conductive rows are misaligned, and the quarter filling rings are inserted into the inner cavity of the coil assembly in turn. It plays the role of internal filling, supporting the coil assembly and the potting colloid. The foaming material reduces the damage to the potting colloid structure. Its low density makes the product light. When the coil assembly and the potting colloid expand and contract, the foaming material can release the internal stress and prevent the glue layer from cracking. At the same time, because the amount of potting colloid used is greatly reduced, the quality problems such as large shrinkage rate of appearance and multiple internal cavities caused by large amounts of potting colloid are reduced, the local discharge phenomenon is reduced, and the difficulty and cost of process execution are reduced.

[0039] The coil body also includes insulating paper 5 which is arranged between the coils of the coil body and plays an insulating role. The insulating paper 5 includes multiple layers of whole sheets of NOMEX insulating paper.

[0040] It also includes a binding tape 6 for binding the insulating paper 5 and the coil body 1.3, and the binding tape 6 is an alkali-free glass ribbon.

[0041] It also includes a mesh cloth 7 wrapped around the outside of the coil body 1.3, and the mesh cloth 7 is a mesh-shaped epoxy resin glass cloth; the mesh cloth 7 is fixed to the outside of the coil body 1.3 by a glass ribbon 8 and a single-sided glass tape 9 with adhesive. The mesh cloth is made of epoxy resin impregnated glass cloth, in a mesh shape, with good toughness and strength. By passing through the outer diameter and inner hole of the coil assembly, it plays a role in binding and fixing the coil assembly, providing support for the potting colloid, and thus plays a role in strengthening the mechanical structure.

[0042] The insulating tube 3 is made of epoxy glass cloth tube, and a potting colloid 4 is filled between the insulating tube 3 and the bound coil body 1.3.

[0043] The inner hole of the insulating tube is the mounting hole of the reactor, and its wall thickness is moderate. There is enough distance and space between the outer ring and the inner hole of the bound coil body for filling the potting colloid. The glue layer is thick enough, the local and overall mechanical strength is high, and the surface quality of the inner hole of the mounting hole is good. When assembling the mold, the insulating tube is installed on the casting mold, and the reactor is potted out as a whole. During potting, the insulating tube also plays the role of sealing the liquid potting colloid. It is difficult to cast the inner hole, and the inner hole is prone to defects. When the thickened insulating tube or insulating rod has a thinner glue layer, the insulating tube is used as the inner hole positioning.

[0044] refer to Figure 4 The material of the potting colloid 4 is polyurethane, which has good flexibility. The potting colloid 4 includes a positioning hole 4.1, a mounting plane 4.2, an arc surface 4.3, an external transition surface 4.4 and a conical surface 4.5 formed by integral casting; the positioning hole 4.1, the mounting plane 4.2, the arc surface 4.3, the external transition surface 4.4 and the conical surface 4.5 together constitute the facade of the potting colloid 4; the positioning hole 4.1 is arranged on the mounting plane 4.2, and is used to position the reactor in the circumferential direction and to fix and clamp the iron plate on the reactor; the external transition surface 4.4 is used to transitionally connect the arc surface 4.3 and the conical surface 4.5; the conical surface 4.5 is used to facilitate demoulding of the casting mold after potting, and the transition between the two conical surfaces 4.5 is smooth and stress concentration-free.

[0045] The material of the potting colloid is convenient for the reactor to be powered on and cooled by water inside. It is suitable for the working conditions where the temperature difference between the coil assembly and the potting colloid is large and the hot and cold expansion is large. The glue layer is not easy to crack, and the coil and the potting colloid are not easy to delaminate, which reduces the partial discharge phenomenon. In the mold, the positioning holes are poured out at one time to position the reactor in the circumferential direction. The installation plane is used to install two clamping iron plates so that the reactor is installed and fastened on the external frame without rotation. At the same time, when the power is turned on, the water is running, and the coil assembly and other internal hot and cold alternate, the clamping iron plates prevent the reactor from deforming in the thickness direction and the glue layer from cracking. The shape of the arc surface is basically consistent with the shape and distance of the coil assembly, and the thickness of the potting colloid layer is basically consistent, which eliminates the stress concentration and cracking of the glue layer caused by uneven thickness, and facilitates demolding after casting. The external transition surface is used to transition the arc surface and the conical surface to eliminate the stress concentration of the potting colloid and prevent the cracking of the glue layer. The conical surface facilitates demoulding of the casting mold after potting, and the transition between the two conical surfaces is smooth without stress concentration.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A ring-shaped water-cooled reactor, characterized in that: It comprises a coil assembly (1), a filling ring (2), an insulating tube (3) and a potting colloid (4); The coil assembly (1) comprises a conductive bar (1.1), a water connector (1.2) and a coil body (1.3); the coil body (1.3) is a hollow tube with a hollow interior, and the hollow tube is wound around a filling ring (2) to form a plurality of coils; water connectors (1.2) are arranged at both ends of the coil body (1.3), and the water connectors (1.2) are fixedly arranged on the conductive bar (1.1); An insulating tube (3) is arranged at the rotation center of the filling ring (2), and the insulating tube (3) is arranged perpendicular to the plane where the filling ring (2) is located; The coil assembly (1), the filling ring (2) and the insulating tube (3) are filled with a potting colloid (4) on the outside, and a portion of the conductive bar (1.1) and the water joint (1.2) are exposed from the potting colloid (4).

2. The annular water-cooled reactor according to claim 1, characterized in that: The coil body (1.3) is made of an aluminum alloy profile, which is a 6-series hard aluminum alloy. The conductive bar (1.1), the water joint (1.2) and the coil body (1.3) are connected by welding. The outer contour of the cross section of the hollow tube of the coil body (1.3) is a square, and the four corners of the square are rounded.

3. The annular water-cooled reactor according to claim 1, characterized in that: The conductive bar (1.1) is provided with a plurality of through holes, some of which are used for mounting the insulating plate (10), and the remaining through holes are used for connecting to an external power source; The insulating plate (10) is made of an epoxy glass cloth plate and is used to position and fix the conductive bar (1.1).

4. The annular water-cooled reactor according to claim 1, characterized in that: The thickness of the conductive bar (1.1) is consistent with the outer diameter of the hollow tube of the coil body (1.3), and the width of the conductive bar (1.1) is one third of the total height of the coil body (1.3).

5. The annular water-cooled reactor according to claim 1, characterized in that: The filling ring (2) is composed of four quarter-circular rings (2.1) connected to each other, and is made of a foaming material having the same expansion coefficient as the potting colloid (4).

6. The annular water-cooled reactor according to any one of claims 1 to 5, characterized in that: It also comprises insulating paper (5) arranged between the coils of the coil body and having an insulating effect, wherein the insulating paper (5) comprises multiple layers of whole sheets of NOMEX insulating paper.

7. The annular water-cooled reactor according to claim 6, characterized in that: It also includes a binding belt (6) for binding the insulating paper (5) and the coil body (1.3), wherein the binding belt (6) is an alkali-free glass ribbon.

8. The annular water-cooled reactor according to claim 7, characterized in that: It also includes a mesh cloth (7) wrapped around the outside of the coil body (1.3), wherein the mesh cloth (7) is a mesh-shaped epoxy resin glass fiber cloth; The mesh cloth (7) is fixed to the outside of the coil body (1.3) by means of a glass ribbon (8) and a glass ribbon adhesive tape (9) with adhesive on one side.

9. The annular water-cooled reactor according to claim 1, characterized in that: The insulating tube (3) is made of epoxy glass cloth tube, and a potting colloid (4) is filled between the insulating tube (3) and the bound coil body (1.3).

10. The annular water-cooled reactor according to claim 9, characterized in that: The material of the potting colloid (4) is polyurethane, and the potting colloid (4) comprises a positioning hole (4.1), a mounting plane (4.2), an arc surface (4.3), an external transition surface (4.4) and a conical surface (4.5) formed by integral casting; the positioning hole (4.1), the mounting plane (4.2), the arc surface (4.3), the external transition surface (4.4) and the conical surface (4.5) together constitute the outer facade of the potting colloid (4); The positioning hole (4.1) is arranged on the installation plane (4.2) and is used to position the reactor in the circumferential direction and to fix and clamp the iron plate on the reactor; the external transition surface (4.4) is used to transitionally connect the arc surface (4.3) and the conical surface (4.5); the conical surface (4.5) is used to facilitate demoulding of the casting mold after potting, and the transition between the two conical surfaces (4.5) is smooth and free of stress concentration.

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