Method for tightly supporting iron core column and coil

Abstract

The invention belongs to the field of transformer production, and relates to an iron core column and coil tightening method which is suitable for a vertical coil transformer and comprises the following steps that a fire hose assembly for tightening is manufactured, and the fire hose assembly comprises a fire hose and a switch valve; binding the tail end of the fire hose by using a cloth belt, pulling the cloth belt to insert the fire hose into a gap between the iron core column and the coil, and clamping and sealing the tail end of the fire hose by using a pipe clamp; an oil pump is used as oil injection equipment to inject oil and pressurize the fire hose until the gap between the iron core column and the coil can be plugged into the insulating supporting strip, and after the insulating supporting strip is vertically plugged into the gap, close to the fire hose, between the iron core column and the coil, the pipe clamp is detached from the tail end of the fire hose with oil emptied; and the fire hose is pulled out between the iron core column and the coil. The technological method is easy to operate, the tight supporting operation between the coil and the iron core column of the vertical coil transformer can be simple and effective, and the problem that tight supporting between the coil and the iron core column is difficult to implement is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer production, and relates to a method for tightening an iron core column and a coil, which is suitable for the production of vertical winding transformers. Background Art

[0002] In the design of the transformer, the inner diameter of the coil inner cylinder and the outer diameter of the core column are slightly different, resulting in a gap between the inner circumference of the coil inner cylinder and the outer circumference of the core column after assembly, reducing the mechanical strength of the coil and the core column after assembly. When a short circuit fault occurs, under the influence of the huge overcurrent electromotive force, the above gap will make the coil more likely to shift, twist or even collapse.

[0003] The vertical coil transformer is an energy-saving power transformer that improves the laminated magnetic circuit structure and three-phase layout of traditional power transformers to optimize product performance.

[0004] Due to the special structure of the vertical roll transformer itself, after the coil of the vertical roll transformer is mounted on the outer periphery of the core column, the coil and the core column are often not completely in close contact with each other, and there is a gap between the core column and the coil, which cannot meet the quality requirements for normal assembly of the vertical roll transformer product. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a method for tightening an iron core column and a coil. The technical solution adopted by the present invention is as follows: A method for tightening an iron core column and a coil, wherein the outer periphery of the iron core column is covered with a coil, comprising the following steps: A fire hose assembly for tightening is manufactured, wherein the fire hose assembly comprises a fire hose and a switch valve, and the head end of the fire hose is sealedly connected to one end of the switch valve; Tie the tail end of the fire hose with a cloth tape, insert the cloth tape into the gap on one side between the core column and the coil, pull the cloth tape to insert the tail end of the fire hose into the gap between the core column and the coil and pass it out from the other side, and seal the tail end of the fire hose with a pipe clamp after passing through. At least three groups of fire hose assemblies are evenly distributed on the periphery of each core column; use an oil pump with a pressure gauge as an oil filling device, seal the other end of the switch valve to the oil pump outlet, start the oil pump to fill the fire hose with oil and pressurize it until the gap between the core column and the coil is wide enough to fit the insulating support bar; Keep the fire hose in a pressurized state, and insert the insulating stay vertically into the gap between the iron core column and the coil near the fire hose; After all the insulating stays are tightly installed, seal the other end of the switch valve to the oil return device, and the oil return device will pump the oil in the fire hose back into the special oil tank; remove the pipe clamp from the tail end of the fire hose that has been drained of oil, and pull the fire hose out of the gap between the core column and the coil.

[0006] Preferably, trim the head end of the fire hose to ensure that the cut end of the fire hose is straight; select a sleeve and a tapered pin that match the fire hose, mark the outer surface of the fire hose at a position that is the same distance from the cut end and the depth of the sleeve, fix the sleeve in a bench vise, insert the large end of the tapered pin into the head end of the fire hose, and insert the small end of the tapered pin into the sleeve; after judging that the cut end of the head end of the fire hose reaches the bottom of the sleeve based on the mark made, tighten the fastening nut of the small end of the tapered pin.

[0007] Preferably, during the tightening process of the fastening nut, the fire hose between the tapered pin and the sleeve is checked to ensure that no wrinkles are generated in the fire hose.

[0008] Preferably, cardboard is placed at the contact portion between the fire hose, the core column and the coil.

[0009] Preferably, the initial pressure is applied to 10% of the maximum pressure for the first time. After observing that there is no bending deformation on the inner diameter side of the coil and no bending of the silicon steel sheet on the core column, the pressure is continued until the gap between the core column and the coil is wide enough to fit the insulating stay.

[0010] Beneficial effects of the present invention: 1. The process method of the present invention is simple to operate. By using this method, the tightening operation between the coil and the core column of the vertical winding transformer can be simple and effective, solving the problem that the tightening between the coil and the core column is difficult to implement.

[0011] 2. This method can effectively ensure the effect of tightening the coil and the surface of the core column. After tightening, the short-circuit resistance of the vertical coil transformer product is improved, and the product quality is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is a schematic diagram of a state where the core column and the coil are tightened according to an embodiment of the present invention; Figure 2 is a top view of a coil according to an embodiment of the present invention; In the figure, 1 is the core column, 2 is the coil, and 3 is the insulating support bar. DETAILED DESCRIPTION

[0013] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0014] like Figure 1 , 2As shown, the vertical coil transformer includes three core columns 1 arranged in a herringbone shape, and a coil 2 is mounted on the outer periphery of the core column 1. After mounting, there is a gap between the core column 1 and the coil 2. It is necessary to use a fire hose assembly to insert an insulating support bar 3 into the gap to achieve tightening of the core column 1 and the coil 2.

[0015] The method for tightening the core column 1 and the coil 2 comprises the following steps: 1. Make a fire hose assembly for tightening, the fire hose assembly comprising a fire hose and a switch valve.

[0016] 1.1. Select a section of fire hose and trim the head (one end) of the fire hose with scissors to ensure that the cut end of the fire hose is straight.

[0017] 1.2. Select the sleeve and tapered pin that match the fire hose. The center position of the tapered pin in the length direction is a through tubular structure. One end of the sleeve is closed and has a through hole for the small end of the tapered pin to pass through. The diameter of the through hole is smaller than the diameter of the large end of the tapered pin. The small end of the tapered pin is provided with an external thread. By tightening the fastening nut on the external thread, the tapered pin and the sleeve can be fixedly connected as one. The inner diameter of the sleeve matches the outer diameter of the large end of the tapered pin. The inner diameter of the sleeve is slightly larger than the outer diameter of the large end of the tapered pin. The gap between the sleeve and the large end of the tapered pin needs to be able to accommodate the fire hose through interference fit; the inner diameter of the fire hose matches the outer diameter of the large end of the tapered pin. The outer diameter of the large end of the tapered pin is slightly smaller than the inner diameter of the fire hose. The head end of the fire hose can be interference fit on the large end of the tapered pin.

[0018] 1.3. Use a marker to mark the outer surface of the fire hose at the same depth as the cutout of the fire hose head. Hold the conical pin to fix the sleeve in the bench vise, loosen the fastening nut at the small end of the conical pin, and pull the conical pin out of the sleeve. Insert the large end of the conical pin into the fire hose head, and then insert the small end of the conical pin into the sleeve.

[0019] 1.4. According to the markings on the outer surface of the fire hose, check whether the cut at the head end of the fire hose has reached the bottom of the sleeve. When the cut at the head end of the fire hose reaches the bottom of the sleeve, tighten the fastening nut at the small end of the tapered pin. In step 1.3, first install the sleeve in the bench vise to ensure the tightening force of the fastening nut. During the tightening process of the fastening nut, check the fire hose between the tapered pin and the sleeve to ensure that there are no wrinkles on the fire hose. After tightening the fastening nut, seal the small end of the tapered pin with one end of the switch valve through a pipe joint, and seal the other end of the switch valve with the oil filling equipment through a pipe joint. Through the matching sleeve and tapered pin, the head end of the fire hose can be reliably sealed and connected to the switch valve as a whole, ensuring that there will be no oil leakage at the head end of the fire hose when tightening the oil filling.

[0020] 2. Install the fire hose assembly.

[0021] 2.1. Tie the tail end (the other end) of the fire hose with a cloth tape, insert the cloth tape into the gap between the core column 1 and the coil 2, pull the cloth tape to insert the tail end of the fire hose into the gap between the core column 1 and the coil 2 and pass it out from the other end. Use one set of fire hose assemblies at an interval of 120° on the outer circumference of each core column 1, and use three sets of fire hose assemblies in total.

[0022] 2.2. Use a pipe clamp to clamp and seal the tail end of the fire hose after it is passed through to ensure that there will be no oil leakage at the tail end of the fire hose when it is tightened and oil is injected.

[0023] 2.3. Temporarily place cardboard at the contact area between the fire hose, the core column 1 and the coil 2 for protection.

[0024] 2.4. Use an oil pump with a pressure gauge as the oil filling equipment to pressurize the fire hose. The oil pump is connected to the switch valve at the head of the fire hose. The initial pressure can be increased to 10% of the maximum pressure for the first time. Open the switch valve at the head of the fire hose and observe whether the inner diameter side of the coil 2 is bent or deformed, and whether the core column 1 has any abnormal phenomena such as bending of the silicon steel sheet.

[0025] 2.5. If there is no abnormality, continue to apply pressure until the gap between the core column 1 and the coil 2 is wide enough to fit the insulating support bar 3.

[0026] 3. Tighten the coil 2 and the core column 1.

[0027] 3.1. Keep the fire hose in a pressurized state, and vertically insert the insulating stay 3 into the gap between the core column 1 and the coil 2 near the fire hose. The thickness of the insulating stay 3 matches the width of the gap between the core column 1 and the coil 2. The inserted insulating stays 3 are arranged at 120° intervals to ensure that the core column 1 and the coil 2 are tightly supported by the insulating stays 3.

[0028] 3.2. After all the insulating stays 3 are plugged and installed, connect the switch valve to the oil return device and pump the oil in the fire hose back into the dedicated oil tank. Remove the pipe clamp from the tail end of the fire hose that has been emptied of oil, and pull the fire hose out of the gap between the core column 1 and the coil 2.

[0029] The embodiment of the present invention can be applied to the process of tightening the coil of a vertical winding transformer, and can tighten the coil of the vertical winding transformer, ensure the compression effect of the transformer body, and ensure product quality.

[0030] In the embodiments of the present invention, technical features that are not described in detail are all existing technologies or conventional technical means and will not be described in detail here.

[0031] Finally, it should be noted that the above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them, and the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. A method for tightening an iron core column and a coil, wherein the outer periphery of the iron core column is provided with a coil, characterized in that: The following steps are involved: A fire hose assembly for tightening is manufactured, wherein the fire hose assembly comprises a fire hose and a switch valve, and the head end of the fire hose is sealedly connected to one end of the switch valve; Tie the tail end of the fire hose with a cloth tape, insert the cloth tape into the gap on one side between the core column and the coil, pull the cloth tape to insert the tail end of the fire hose into the gap between the core column and the coil and pass it out from the other side, and seal the tail end of the fire hose with a pipe clamp after passing through. At least three groups of fire hose assemblies are evenly distributed on the periphery of each core column; use an oil pump with a pressure gauge as an oil filling device, seal the other end of the switch valve to the oil pump outlet, start the oil pump to fill the fire hose with oil and pressurize it until the gap between the core column and the coil is wide enough to fit the insulating support bar; Keep the fire hose in a pressurized state, and insert the insulating stay vertically into the gap between the iron core column and the coil near the fire hose; After all the insulating stays are tightly installed, seal the other end of the switch valve to the oil return device, and the oil return device will pump the oil in the fire hose back into the special oil tank; remove the pipe clamp from the tail end of the fire hose that has been drained of oil, and pull the fire hose out of the gap between the core column and the coil.

2. The method for tightening the core column and the coil according to claim 1, characterized in that: Trim the head of the fire hose to ensure that the cut end of the fire hose is straight; select the sleeve and tapered pin that match the fire hose, mark the outer surface of the fire hose at the same distance from the cut end and the depth of the sleeve, fix the sleeve in the bench vise, insert the large end of the tapered pin into the head of the fire hose, and insert the small end of the tapered pin into the sleeve; judge according to the mark that the cut end of the fire hose head has reached the bottom of the sleeve, and tighten the fastening nut at the small end of the tapered pin.

3. The method for tightening the core column and the coil according to claim 2, characterized in that: During the tightening process of the fastening nut, check the fire hose between the tapered pin and the sleeve to ensure that there are no wrinkles in the fire hose.

4. The method for tightening the core column and the coil according to claim 1, characterized in that: Place cardboard at the contact point between the fire hose, the core column and the coil.

5. The method for tightening the core column and the coil according to claim 1, characterized in that: Initially apply pressure to 10% of the maximum pressure. After observing that there is no bending deformation on the inner diameter side of the coil and no bending of the silicon steel sheet on the core column, continue to apply pressure until the gap between the core column and the coil is wide enough to fit the insulating support bar.

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