Water and electricity isolation type water-cooled transformer

Abstract

The utility model discloses a water and electricity isolation type water-cooled transformer which comprises a coil framework, insulation paper, a coil winding and a cooling water pipe, and the coil framework, the framework insulation paper, the secondary coil winding, the insulation paper between the winding and the water pipe, a secondary water-cooled radiating pipe, the insulation paper between the winding and the water pipe and the primary coil winding are sequentially arranged from the inner layer to the outer layer. Insulation paper is arranged between the winding and the water pipe, and the primary water-cooling radiating pipe is wrapped by insulation paper. According to the cooling water pipe, seamless copper pipes are wound on the surface of insulation paper between a winding and a water pipe, are folded into double-layer copper pipes during winding, and are synchronously wound in parallel, so that the problem of induced voltage caused by copper pipe winding is avoided, a copper pipe loop forms a positive and negative winding effect, the induced voltage is just counteracted, and no induced output voltage exists; the heating coil can be fully contacted, the contact area is large, and the heat dissipation effect is good; compared with the prior art, processing cost is saved, and reliability is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a water-electricity isolation type water-cooled transformer. Background Art

[0002] Water-cooled transformers are mainly divided into water-electricity integrated and water-electricity isolated types according to the cooling process. Among them, water-electricity integrated water-cooled transformers usually use copper tubes to wind coils, the hollow part of the copper tube is used as a water channel, and the outer copper material is used as a circuit. Its advantages are high heat dissipation efficiency, high power density, good sealing, simple structure and easy maintenance. However, water-electricity integrated water-cooled transformers also have disadvantages. There are great hidden dangers in their safety insulation. Only low voltage is easier to meet safety requirements. Therefore, water-electricity integrated water-cooled transformers on the market are generally transformers with low voltage and high current characteristics. This process is used. High-voltage transformers use water-electricity isolated water cooling technology, usually using independent water cooling plates to closely fit the heating windings for heat dissipation. Its advantages are that the process is easy to meet safety requirements, and its disadvantages are that the processing technology is complicated, the heat dissipation plate is expensive, and it can only be partially fitted with the coil windings for heat dissipation, and the later pipeline connections are complicated. In summary, water-electricity integrated and water-electricity isolated water-cooled transformers have their own advantages and disadvantages, and both have obvious defects. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art, provide a new type of water-electricity isolation type water-cooled transformer, combine the advantages and disadvantages of the water-electricity integration and water-cooling isolation type water-cooled transformer processes to make improvements, and effectively solve the problems in the background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] The utility model discloses a water-electric isolation type water-cooled transformer, comprising a coil frame, insulating paper, a coil winding and a cooling water pipe, wherein the coil frame is spliced ​​into a rectangular cavity by insulating materials, the insulating paper is used for interlayer insulation, and the cooling water pipe is a seamless copper pipe wound on the surface of the insulating paper for water cooling and heat dissipation.

[0006] Furthermore, the insulating paper includes skeleton insulating paper, winding interlayer insulating paper, winding and water pipe insulating paper, and outer covering insulating paper, which are respectively used for insulation between the coil winding and the coil skeleton, insulation between the coil winding layers, insulation between the coil winding and the cooling water pipe, and coil outer covering insulation.

[0007] Furthermore, the cooling water pipe is wound around the surface of the insulating paper between the winding and the water pipe using a seamless copper tube. When winding, the seamless copper tube is folded into a double-layer copper tube and wound synchronously in parallel, that is, a long copper tube is bent in the middle, half of the copper tube is wound in the forward direction along the coil voltage phase sequence, covering the entire coil winding, and the other half of the copper tube is folded in the reverse direction along the coil voltage phase sequence, and wound back from the spiral gap of the copper tube wound in the forward direction, so that the forward and reverse copper tubes are synchronously connected in parallel.

[0008] Preferably, the cooling water pipes are wound in parallel, and the side-by-side spacing thereof is greater than 3 mm.

[0009] Preferably, the cooling water pipe is a long copper pipe bent at a central position, and the diameter of the fillet at the bend is larger than the diameter of the copper pipe.

[0010] Furthermore, the coil winding includes a primary coil winding and a secondary coil winding, the cooling water pipe includes a primary water-cooling heat dissipation pipe and a secondary water-cooling heat dissipation pipe, and the water-electric isolation type water-cooled transformer comprises, from the inner layer to the outer layer, a coil skeleton, skeleton insulation paper, a secondary coil winding, insulation paper between the winding and the water pipe, a secondary water-cooling heat dissipation pipe, insulation paper between the winding and the water pipe, a primary coil winding, insulation paper between the winding and the water pipe, a primary water-cooling heat dissipation pipe, and an outer insulation paper; both the primary coil winding and the secondary coil winding are provided with winding layer insulation paper.

[0011] The water-cooled transformer provided by the utility model belongs to the water-electricity isolation type. Compared with the water-electricity isolation type water-cooled transformer in the prior art, the copper tube is used to replace the water-cooled heat sink to wrap around the surface of the heating conductor, and the structural characteristics of the water-electricity integrated water-cooled transformer are integrated, which has the following advantages:

[0012] 1. The copper tube is folded in half and wound synchronously in parallel, which cleverly avoids the problem of induced voltage caused by copper tube winding. The copper tube loop forms a positive and negative winding effect, and the induced voltage is just offset, and there is no induced output voltage;

[0013] 2. Compared with the existing water-electric isolation water-cooled transformer, the copper tube is wound on the coil and can fully contact with the heating coil. The larger the contact area, the better the heat dissipation effect, which improves the heat dissipation efficiency;

[0014] 3. Compared with the existing water-electric isolation water-cooled transformer, it uses standard copper tubes and does not require additional processing of heat sinks, saving processing costs;

[0015] 4. Compared with the existing water-electricity integrated water-cooled transformer, it has higher reliability and there is no need to worry about leakage problems such as copper pipe leakage and poor sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional structural diagram of the utility model;

[0017] Figure 2 This is a structural diagram of the water-cooling heat dissipation pipe of the utility model;

[0018] Figure 3 This is a working schematic diagram of the water-cooling heat dissipation pipe of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of a water-cooled transformer and a water-cooled heat sink in the prior art.

[0020] In the figure: 1. Coil skeleton; 2. Skeleton insulation paper; 3. Secondary coil winding; 4. Insulation paper between winding and water pipe; 5. Primary coil winding; 6. Insulation paper between winding layers; 7. Secondary water-cooled heat pipe; 8. Primary water-cooled heat pipe; 9. Outer insulation paper; 10. Water-cooled heat sink. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The utility model discloses a water-electric isolation type water-cooled transformer, comprising a coil frame, insulating paper, a coil winding and a cooling water pipe, wherein the coil frame is spliced ​​into a rectangular cavity by insulating materials, the insulating paper is used for interlayer insulation, and the cooling water pipe is a seamless copper pipe wound on the surface of the insulating paper for water cooling and heat dissipation.

[0023] Embodiment 1: Figure 1 The water-electric isolation type water-cooled transformer shown includes a coil skeleton 1, insulating paper, coil windings and cooling water pipes. The insulating paper includes skeleton insulating paper 2, winding interlayer insulating paper 6, winding and water pipe insulation paper 4, and outer insulation paper 9, which are respectively used for insulation between the coil winding and the coil skeleton, insulation between the coil winding layers, and insulation between the coil winding and the cooling water pipe, and the coil outer insulation. The coil winding includes a primary coil winding 5 and a secondary coil winding 3, and the cooling water pipe includes a primary water-cooled heat dissipation pipe 8 and a secondary water-cooled heat dissipation pipe 7. The water-electric isolation type water-cooled transformer is composed of a coil skeleton 1, skeleton insulating paper 2, secondary coil winding 3, winding and water pipe insulation paper 4, secondary water-cooled heat dissipation pipe 7, winding and water pipe insulation paper 4, primary coil winding 5, winding and water pipe insulation paper 4, primary water-cooled heat dissipation pipe 8, and outer insulation paper 9 from inner to outer layers; the primary coil winding 5 and the secondary coil winding 3 are both provided with winding interlayer insulating paper 6.

[0024] Combination Figure 1 , 2As shown, the cooling water pipe, i.e., the secondary water-cooling heat dissipation pipe 7, and the primary water-cooling heat dissipation pipe 8 have the same structure as the secondary water-cooling heat dissipation pipe 7, but different sizes, and all adopt seamless copper tubes to be wound on the surface of the insulating paper 4 between the winding and the water pipe. The seamless copper tube is folded into a double-layer copper tube when winding, and is wound synchronously in parallel, that is, a long copper tube is bent at the center position, half of the copper tube is wound in the forward direction along the phase sequence of the coil voltage, covering the entire coil winding, and the other half of the copper tube is folded in half and wound in the reverse direction along the phase sequence of the coil voltage, and is wound back from the spiral gap of the copper tube wound in the forward direction, so that the forward and reverse copper tubes are synchronously connected in parallel. Figure 2 In the lower left corner of the upper picture, you can see that after the copper tube is wound, the cooling water inlet and outlet are connected in parallel; in the lower right corner of the lower picture, you can see that the copper tube is bent in the middle.

[0025] As a preferred solution, the cooling water pipes are wound in parallel, and the side-by-side spacing is greater than 3 mm; the cooling water pipe is made of a long copper pipe that is bent at the center, and the fillet diameter at the bend is greater than the diameter of the copper pipe.

[0026] The water-cooled transformer provided by the utility model is of the water-electricity isolation type. Compared with the water-electricity isolation water-cooled transformer in the prior art, a copper tube is used to replace the water-cooled heat sink to wrap around the surface of the heating conductor, and the structural characteristics of the water-electricity integrated water-cooled transformer are integrated to achieve remarkable beneficial effects.

[0027] Combination Figure 1 , 2 As shown, compared with the prior art water-electricity integrated water-cooled transformer, it has higher reliability and there is no need to worry about leakage problems such as copper pipe leakage and poor sealing.

[0028] like Figure 3 As shown, Figure 3 (a) and (b) are views of the cooling water pipe from two different angles. The secondary water-cooling heat dissipation pipe 7 (the primary water-cooling heat dissipation pipe 8 has the same structure as the secondary water-cooling heat dissipation pipe 7) is made of a copper pipe folded in half and wound in parallel synchronously, which cleverly avoids the problem of induced voltage caused by copper pipe winding. The copper pipe loop forms a forward and reverse winding effect, and the coil induced voltage is as follows: Figure 3 As shown by the arrow in (b), the induced voltages are exactly offset and there is no induced output voltage.

[0029] Figure 4 The figure shows a water-electric isolation water-cooled transformer in the prior art. Figure 4(a), (b) and (c) are schematic diagrams of the cross-sectional structure of the entire water-cooled transformer, and schematic diagrams of the front and side views of the water-cooled heat sink 10 therein, respectively. The use of an independent water-cooled heat sink 10 to closely fit the heating winding for heat dissipation has the advantage that the process is easy to meet safety regulations, but the disadvantages are that the processing process is complicated, the heat sink is expensive, and can only partially fit the coil winding for heat dissipation, and the subsequent pipeline connection is complicated. Compared with the prior art water-electric isolation water-cooled transformer, the copper tube of the utility model is wound around the coil and can fully contact the heating coil. The larger the contact area, the better the heat dissipation effect, which improves the heat dissipation efficiency; standard copper tubes are used, and there is no need to additionally process the heat sink, saving processing fees.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-electric isolation water-cooled transformer, characterized in that: It includes a coil frame, insulating paper, coil windings and a cooling water pipe. The coil frame is spliced ​​into a rectangular cavity with insulating materials. The insulating paper is used for interlayer insulation. The cooling water pipe is a seamless copper pipe wound on the surface of the insulating paper for water cooling and heat dissipation.

2. The water-electricity isolation water-cooled transformer according to claim 1, characterized in that: The insulating paper includes skeleton insulating paper, winding interlayer insulating paper, winding and water pipe insulating paper, and outer covering insulating paper, which are respectively used for insulation between the coil winding and the coil skeleton, insulation between the coil winding layers, insulation between the coil winding and the cooling water pipe, and coil outer covering insulation.

3. The water-electricity isolation water-cooled transformer according to claim 2 is characterized in that: The cooling water pipe adopts a seamless copper tube wound on the surface of the insulating paper between the winding and the water pipe; the seamless copper tube is folded into a double-layer copper tube when winding, and is wound synchronously in parallel, that is, a long copper tube is bent at the center position, half of the copper tube is wound in the forward direction along the coil voltage phase sequence, covering the entire coil winding, and the other half of the copper tube is folded in the reverse direction along the coil voltage phase sequence, and is wound back from the spiral gap of the forward-wound copper tube, so that the forward and reverse copper tubes are synchronously connected in parallel.

4. The water-electricity isolation water-cooled transformer according to claim 3 is characterized in that: The cooling water pipes are wound in parallel, and the parallel spacing between them is greater than 3 mm.

5. The water-electricity isolation water-cooled transformer according to claim 3 is characterized in that: The cooling water pipe is made of a long copper pipe which is bent at the center, and the diameter of the fillet at the bending position is larger than the diameter of the copper pipe.

6. The water-electricity isolation water-cooled transformer according to claim 3 is characterized in that: The coil winding includes a primary coil winding and a secondary coil winding, the cooling water pipe includes a primary water-cooling heat dissipation pipe and a secondary water-cooling heat dissipation pipe, and the water-electric isolation type water-cooled transformer comprises, from the inner layer to the outer layer, a coil skeleton, skeleton insulation paper, a secondary coil winding, insulation paper between the winding and the water pipe, a secondary water-cooling heat dissipation pipe, insulation paper between the winding and the water pipe, a primary coil winding, insulation paper between the winding and the water pipe, a primary water-cooling heat dissipation pipe, and an outer insulation paper; both the primary coil winding and the secondary coil winding are provided with winding layer insulation paper.

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