A transformer cover vibration and noise reduction structure, transformer and preparation method thereof

Abstract

The present invention belongs to the technical field of transformer manufacturing, and relates to a transformer cover vibration and noise reduction structure, a transformer and a preparation method thereof. The existing upper iron core beam of the transformer is reasonably utilized, and an upper iron core positioning structure is fixedly installed at the center position of the upper surface of the upper iron core beam as a support and fixing point for the transformer cover vibration and noise reduction; a rubber sheet and an insulating paperboard are covered on the periphery of the upper iron core positioning structure, the rubber sheet is used to reduce vibration and noise, and the insulating paperboard is used to completely insulate various metal parts; a clamping structure is arranged under the transformer cover, and the clamping structure is a threaded fixing block and is matched with bolts and nuts; fasteners such as connecting bolts and connecting nuts are used to firmly connect the cover plate to the transformer cover flange, and the clamping structure and the cover plate clamp the rubber sheet and the insulating paperboard. The present invention reduces the vibration and noise of the converter transformer to ensure the safe operation of the converter transformer and extend its service life.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer production and manufacturing, and in particular relates to a transformer box cover vibration and noise reduction structure, a transformer and a preparation method thereof. Background Art

[0002] When DC current invades the converter transformer body, under the action of DC current, the no-load excitation current shifts on the core magnetization curve, and half of the wave works in the saturation area. The excitation current becomes a peak wave, and the original symmetric waveform changes to an asymmetric waveform; the core flux is half saturated and half unsaturated, and the overall flux waveform shifts, that is, DC bias occurs, and the working point half wave of the transformer core flux enters the nonlinear area of ​​the magnetization curve. Due to the half-wave saturation of the core, a large amount of oversaturated magnetic flux is closed outside the core, and the excitation current is seriously distorted. The converter transformer body will have problems such as increased no-load loss, increased vibration, and increased noise. It will also cause local overheating of the transformer core and other structural parts, and even insulation damage.

[0003] Considering that the harmonic content of the core excitation current will further increase under the DC bias state of the converter transformer, the magnetic flux that is not linked with the core will also increase accordingly, the vibration of the core will intensify, and the noise level of the converter transformer will increase. Vibration and noise will not only damage the environment, but also affect the safe operation and service life of the converter transformer in the long run. In order to deal with the problem of vibration and noise, in addition to using high-permeability high-quality silicon steel sheets and appropriately selecting the clamping force of the core and the pressing force of the body, more measures to reduce vibration and noise are needed, such as improving the positioning structure of the converter transformer cover to reduce vibration and noise, ensuring that the increase in vibration and noise of the transformer is within a reasonable range, and meeting the safe operation requirements and environmental protection requirements of the converter transformer.

[0004] In summary, how to avoid the above problems and reduce the vibration and noise of the converter transformer to ensure the operation and service life of the converter transformer is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In the vibration and noise problems of transformers, unreasonable positioning of transformer cover is an important factor in generating vibration and noise. Therefore, in order to solve the above technical problems, the present invention proposes a transformer cover vibration and noise reduction structure, a transformer and a preparation method thereof. The technical solution adopted by the present invention is:

[0006] A transformer case cover vibration reduction and noise reduction structure, the transformer comprises an iron core upper beam, the transformer case cover vibration reduction and noise reduction structure comprises an iron core upper positioning structure, a rubber plate and an insulating paperboard, the iron core upper positioning structure is fixedly assembled at the center position of the upper surface of the iron core upper beam, the iron core upper beam and the iron core upper positioning structure form a convex structure, the outer periphery (including the side and the upper surface) of the iron core upper positioning structure is covered with a rubber plate and an insulating paperboard, a pressing structure is fixedly arranged on the lower surface of the transformer case cover, the pressing structure presses the rubber plate and the insulating paperboard on the side of the iron core upper positioning structure; the transformer case cover flange is fixedly arranged on the upper surface of the transformer case cover, the cover plate is fixedly connected to the transformer case cover flange, and the cover plate presses the rubber plate and the insulating paperboard on the upper surface of the iron core upper positioning structure.

[0007] Preferably, the insulating paperboard includes a first insulating paperboard, which is a rectangular plate structure. A through hole matching the cross-section of the core upper positioning structure is opened at the center of the first insulating paperboard, and the first insulating paperboard is sleeved on the outer periphery of the lower end of the core upper positioning structure.

[0008] Preferably, the rubber sheet includes a first rubber sheet and a second rubber sheet, and the insulating paper sheet includes a second insulating paper sheet and a third insulating paper sheet; a plurality of first rubber sheets are assembled on the side of the core upper positioning structure in an overlapping manner, the number of the first rubber sheets matches the number of the side of the core upper positioning structure, and the second insulating paper sheet is assembled on the outer side of the first rubber sheet; the second rubber sheet is covered and assembled on the upper surface of the core upper positioning structure, and the third insulating paper sheet is covered and assembled on the upper surface of the second rubber sheet.

[0009] Preferably, the surface area of ​​the first rubber sheet matches the side area of ​​the core upper positioning structure, the surface area of ​​the second rubber sheet matches the upper surface area of ​​the core upper positioning structure, and the surface area of ​​the second insulating paperboard matches the first rubber sheet.

[0010] Preferably, the third insulating paperboard is a circular plate-shaped structure, and the diameter of the third insulating paperboard is smaller than the inner diameter of the transformer box cover flange.

[0011] Preferably, the clamping structure includes a plurality of fixing blocks, the number of the fixing blocks matches the number of sides of the positioning structure on the upper part of the core, the fixing blocks are fixedly arranged on the lower surface of the transformer box cover, one end of the fixing block close to the second insulating paperboard is movably connected to the thread of the bolt, and the head of the bolt clamps the second insulating paperboard and the first rubber sheet.

[0012] Preferably, the fixing block is a rectangular parallelepiped structure, a through internal threaded hole is provided in the length direction of the fixing block, a nut is fitted on one end of the fixing block close to the second insulating paperboard, and the screw of the bolt is screwed into the nut and the internal threaded hole in turn.

[0013] Preferably, the cover plate is fixedly connected to the transformer box cover flange by connecting bolts and connecting nuts.

[0014] A transformer is prepared using the above-mentioned transformer box cover vibration and noise reduction structure.

[0015] A method for preparing a transformer, used for preparing the aforementioned transformer, comprises the following steps:

[0016] Step 1: Rationally utilize the existing upper iron core beam of the transformer, and fix the upper iron core positioning structure at the center of the upper surface of the upper iron core beam as a support and fixing point for positioning the transformer cover and reducing vibration and noise;

[0017] Step 2: Cover the outer periphery of the positioning structure on the upper part of the core with a rubber sheet and an insulating paperboard, wherein the rubber sheet is used to reduce vibration and noise, and the insulating paperboard is used to completely insulate each metal component;

[0018] Step 3: Set a compression structure under the transformer cover;

[0019] Step 4: Use fasteners such as connecting bolts and connecting nuts to firmly connect the cover plate to the transformer box cover flange. The clamping structure and the cover plate clamp the rubber sheet and the insulating paperboard.

[0020] Beneficial effects of the present invention:

[0021] The present invention is based on the core upper beam and improves the existing vibration and noise reduction structure of the converter transformer cover by arranging the core upper positioning structure, rubber plate and insulating paperboard. While ensuring a reliable insulation effect, the vibration and noise of the converter transformer are significantly reduced, thereby ensuring the safe operation of the converter transformer and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the following is a brief introduction to the drawings required for the description of the specific implementation or the prior art. Obviously, the drawings described below are some specific implementations of the present invention. For ordinary technicians in this field, other drawings within the protection scope of this application can be obtained based on these drawings without creative work.

[0023] Figure 1 is a flowchart of the steps of Embodiment 1 of the present invention;

[0024] Figure 2 It is an assembly schematic diagram of the first embodiment of the present invention;

[0025] Figure 3 is a front view of an upper core beam and an upper core positioning structure of a first embodiment of the present invention;

[0026] Figure 4 is a top view of the core upper beam and the core upper positioning structure of the first embodiment of the present invention;

[0027] Figure 5 This is a schematic structural diagram of a first insulating paperboard according to a first embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of assembling the first rubber plate of the first embodiment of the present invention;

[0029] Figure 7 is a front cross-sectional view of a fixing block according to a first embodiment of the present invention;

[0030] Figure 8 is a left side view of the fixing block of the first embodiment of the present invention;

[0031] Fig. 9 is a schematic structural diagram of a cover plate according to a first embodiment of the present invention;

[0032] Fig.10 It is a schematic structural diagram of the transformer box cover flange according to the first embodiment of the present invention;

[0033] In the figure, 1 is the core upper positioning structure, 2 is the first insulating paperboard, 3 is the first rubber plate, 4 is the second insulating paperboard, 5 is the second rubber plate, 6 is the transformer box cover, 7 is the bolt, 8 is the nut, 9 is the fixing block, 10 is the third insulating paperboard, 11 is the transformer box cover flange, 12 is the cover plate, 13 is the core upper beam, and 14 is the internal threaded hole. DETAILED DESCRIPTION

[0034] 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.

[0035] Embodiment 1

[0036] like Figure 1 As shown, it is a flowchart of the steps of the first embodiment of the present invention; Figure 2 A method for preparing a transformer using a transformer cover vibration and noise reduction structure comprises the following steps:

[0037] Step 1: Rationally utilize the existing transformer core upper beam 13, and fix the core upper positioning structure 1 at the center position of the upper surface of the core upper beam 13 as a support and fixing point for positioning the transformer box cover 6 and reducing vibration and noise.

[0038] The core upper beam 13 is a component of the converter transformer. The core upper beam 13 is fixedly installed at the center position below the transformer box cover flange 11 of the converter transformer. The lower part of the core upper beam 13 is connected to the core of the transformer body to achieve the fastening and positioning of the transformer body. The core upper beam 13 is a rectangular structure. Three horizontal through holes are evenly arranged in the width direction of the core upper beam 13. The through holes are connected to the core of the transformer body. The core upper positioning structure 1 is made of carbon steel plates overlapped and welded. The core upper positioning structure 1 is preferably a square column or a rectangular column to facilitate extrusion and compaction on all sides. The core upper positioning structure 1 is welded and fixed to the center position of the upper surface of the core upper beam 13. Figure 3 , which is a front view of the core upper beam and the core upper positioning structure of the first embodiment of the present invention; Figure 4 The figure shows a top view of the core upper beam and the core upper positioning structure of the first embodiment of the present invention. The core upper beam 13 and the core upper positioning structure 1 form an integrally formed convex structure, and the core upper beam 13 and the core upper positioning structure 1 constitute the basic frame of the entire transformer cover vibration reduction and noise reduction structure. After the transformer cover vibration reduction and noise reduction structure is assembled, the core upper positioning structure 1 is located directly below the cover plate 12, and it is convenient to position the transformer cover.

[0039] Step 2: Cover the outer periphery of the positioning structure 1 on the upper part of the core with a rubber sheet and an insulating paperboard. The rubber sheet is used to reduce vibration and noise, and the insulating paperboard is used to completely insulate the metal parts.

[0040] The rubber sheet includes a first rubber sheet 3 and a second rubber sheet 5, and the insulating paperboard includes a first insulating paperboard 2, a second insulating paperboard 4 and a third insulating paperboard 10. Figure 5 The figure is a schematic diagram of the structure of the first insulating paperboard of the first embodiment of the present invention. The first insulating paperboard 2 is a rectangular plate-shaped structure. The center position of the first insulating paperboard 2 is provided with a through hole that matches the cross section of the upper positioning structure 1 of the core. The through hole of the first insulating paperboard 2 passes through the upper positioning structure 1 of the core. The first insulating paperboard 2 is sleeved on the outer periphery of the lower end of the upper positioning structure 1 of the core. The upper surface of the upper beam 13 of the core supports the lower surface of the first insulating paperboard 2. By setting the first insulating paperboard 2, the bolts 7, nuts 8 and the upper beam 13 of the core are completely insulated.

[0041] like Figure 6The figure shows an assembly diagram of the first rubber sheet of the first embodiment of the present invention. The number of the first rubber sheets 3 matches the number of the sides of the core upper positioning structure 1. Four first rubber sheets 3 are assembled around the core upper positioning structure 1 in an overlapping manner. The upper surface of the first insulating paperboard 2 supports the lower surface of the first rubber sheet 3. The first rubber sheet 3 is a plate-like structure. The surface area of ​​the first rubber sheet 3 matches the side area of ​​the core upper positioning structure 1. By providing the first rubber sheet 3, the vibration and noise between the core upper positioning structure 1 and the bolt 7 are reduced. The second rubber sheet 5 is covered and assembled on the upper surface of the core upper positioning structure 1. The second rubber sheet 5 is a plate-like structure. The surface area of ​​the second rubber sheet 5 matches the upper surface area of ​​the core upper positioning structure 1. By providing the second rubber sheet 5, the vibration and noise between the core upper positioning structure 1 and the cover plate 12 are reduced. Combined with Figure 2 A second insulating paperboard 4 is assembled on the outer side of the first rubber sheet 3. The second insulating paperboard 4 is a plate-shaped structure. The surface area of ​​the second insulating paperboard 4 matches the first rubber sheet 3. Bolts 7 support and fix the second insulating paperboard 4. By setting the second insulating paperboard 4, the upper positioning structure 1 of the core is completely insulated from the bolts 7.

[0042] A plurality of third insulating paperboards 10 are covered and assembled on the upper surface of the second rubber sheet 5. The third insulating paperboard 10 is a circular plate-shaped structure, and the diameter of the third insulating paperboard 10 is slightly smaller than the inner diameter of the transformer box cover flange 11. By arranging the third insulating paperboard 10, on the one hand, the core upper positioning structure 1 is completely insulated from the cover plate 12, and on the other hand, it is used to adjust the contact position of the bolt 7 and the second insulating paperboard 4. By adjusting the number of the third insulating paperboards 10, the bolt 7 and the second insulating paperboard 4 are reliably contacted, and the pressing effect of the bolt 7 on the second insulating paperboard 4 and the first rubber sheet 3 is fully guaranteed.

[0043] Step 3, a clamping structure is set on the lower surface of the transformer box cover 6, and the clamping structure includes a plurality of threaded fixing blocks 9. The number of the fixing blocks 9 matches the number of sides of the upper core positioning structure 1. The rubber plate and the insulating paperboard on the side of the upper core positioning structure 1 are pressed together with the bolts 7 and the nuts 8.

[0044] The transformer cover flange 11 is fixedly mounted on the upper surface of the transformer cover 6 by welding, and the fixing block 9 is symmetrically fixedly mounted on the lower surface of the transformer cover 6 by welding, and the fixing block 9 is located below the transformer cover flange 11. Figure 7 , which is a front cross-sectional view of a fixing block according to Embodiment 1 of the present invention; Figure 8The figure shows a left view of the fixing block of the first embodiment of the present invention. The fixing block 9 is a rectangular parallelepiped structure, and a through internal threaded hole 14 is provided in the length direction of the fixing block 9. The nut 8 is fitted on one end of the fixing block 9 close to the second insulating paperboard 4. The screw of the bolt 7 is screwed into the nut 8 and the internal threaded hole 14 in turn, and the length of the bolt 7 screwed into the nut 8 and the internal threaded hole 14 is adjusted so that the head of the bolt 7 presses the second insulating paperboard 4 and the first rubber sheet 3. The fixing block 9 is symmetrically arranged to press the second insulating paperboard 4 and the first rubber sheet 3 from opposite sides (the opposite front side and rear side and the opposite left side and right side). The number of the fixing blocks 9 is preferably four, and one fixing block 9 is arranged on each side, front side, back side, left side, and right side.

[0045] Step 4: Use fasteners such as connecting bolts and connecting nuts to firmly connect the cover plate 12 to the transformer box cover flange 11. The cover plate 12 presses the rubber plate and the insulating paperboard on the upper surface of the core upper positioning structure 1.

[0046] like Fig. 9 , which is a schematic diagram of the structure of the cover plate of the first embodiment of the present invention; Fig.10 The figure is a schematic diagram of the structure of the transformer cover flange of the first embodiment of the present invention. The cover plate 12 and the transformer cover flange 11 are both existing products, and the cover plate 12 and the transformer cover flange 11 are fixedly connected to form a whole by fasteners such as connecting bolts and connecting nuts. The cover plate 12, on the one hand, presses the second rubber plate 5 and the third insulating paperboard 10, and at the same time, plays a role in sealing and plugging the vibration and noise reduction structure of the entire converter transformer cover.

[0047] Embodiment 2

[0048] The upper positioning structure of the core is made of overlapped carbon steel plates, and the upper positioning structure of the core is a column with a triangular cross section, which is convenient for extrusion and compression from three sides. The upper positioning structure of the core is welded and fixed at the center of the upper surface of the upper beam of the core. The second rubber plate is a triangular plate, which matches the upper surface of the upper positioning structure of the core.

[0049] The other implementation methods of the second embodiment are the same as those of the first embodiment and will not be described in detail here.

[0050] 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 transformer cover vibration and noise reduction structure, the transformer comprising an iron core upper beam (13), characterized in that: The transformer cover vibration and noise reduction structure comprises an iron core upper positioning structure (1), a rubber plate and an insulating paperboard. The iron core upper positioning structure (1) is fixedly assembled at the center position of the upper surface of the iron core upper beam (13), and the iron core upper beam (13) and the iron core upper positioning structure (1) form a convex structure; the rubber plate and the insulating paperboard are covered and assembled on the periphery of the iron core upper positioning structure (1); a pressing structure is fixedly arranged on the lower surface of the transformer cover (6), and the pressing structure presses the rubber plate and the insulating paperboard on the side of the iron core upper positioning structure (1); the transformer cover flange (11) is fixedly arranged on the upper surface of the transformer cover (6), and the cover plate (12) is fixedly connected to the transformer cover flange (11), and the cover plate (12) presses the rubber plate and the insulating paperboard on the upper surface of the iron core upper positioning structure (1); The insulating paperboard comprises a first insulating paperboard (2), the first insulating paperboard (2) being a rectangular plate-shaped structure, a through hole matching the cross section of the core upper positioning structure (1) being provided at the center thereof, and the first insulating paperboard (2) being sleeved on the outer periphery of the lower end of the core upper positioning structure (1); The rubber sheet comprises a first rubber sheet (3) and a second rubber sheet (5), and the insulating paper sheet comprises a second insulating paper sheet (4) and a third insulating paper sheet (10); a plurality of first rubber sheets (3) are assembled on the side of an upper core positioning structure (1) in an overlapping manner, the number of the first rubber sheets (3) matches the number of the side of the upper core positioning structure (1), and the second insulating paper sheet (4) is assembled on the outer side of the first rubber sheet (3); the second rubber sheet (5) is assembled on the upper surface of the upper core positioning structure (1), and the third insulating paper sheet (10) is assembled on the upper surface of the second rubber sheet (5).

2. The transformer cover vibration and noise reduction structure according to claim 1, characterized in that: The surface area of ​​the first rubber sheet (3) matches the side surface area of ​​the upper positioning structure (1) of the iron core, the surface area of ​​the second rubber sheet (5) matches the upper surface area of ​​the upper positioning structure (1) of the iron core, and the surface area of ​​the second insulating paperboard (4) matches the first rubber sheet (3).

3. The transformer cover vibration and noise reduction structure according to claim 1, characterized in that: The third insulating paperboard (10) is a circular plate-shaped structure, and the diameter of the third insulating paperboard (10) is smaller than the inner diameter of the transformer box cover flange (11).

4. The transformer cover vibration and noise reduction structure according to claim 1, characterized in that: The clamping structure comprises a plurality of fixing blocks (9), the number of the fixing blocks (9) matches the number of the side surfaces of the core upper positioning structure (1), the fixing blocks (9) are fixedly arranged on the lower surface of the transformer box cover (6), one end of the fixing block (9) close to the second insulating paperboard (4) is movably connected to the thread of the bolt (7), and the head of the bolt (7) clamps the second insulating paperboard (4) and the first rubber plate (3).

5. The transformer cover vibration and noise reduction structure according to claim 4, characterized in that: The fixing block (9) is a rectangular parallelepiped structure, and a through internal threaded hole (14) is provided in the length direction of the fixing block (9). The nut (8) is fitted on one end of the fixing block (9) close to the second insulating paperboard (4), and the screw of the bolt (7) is screwed into the nut (8) and the internal threaded hole (14) in sequence.

6. The transformer cover vibration and noise reduction structure according to claim 1, characterized in that: The cover plate (12) is fixedly connected to the transformer box cover flange (11) via connecting bolts and connecting nuts.

7. A transformer, characterized in that: A transformer cover vibration and noise reduction structure as described in claim 1 is used for preparation.

8. A method for preparing a transformer, characterized in that: The method for preparing the transformer according to claim 7 comprises the following steps: Step 1: Using the existing transformer iron core upper beam (13), the iron core upper positioning structure (1) is fixedly installed at the center position of the upper surface of the iron core upper beam (13) as a supporting and fixing point for positioning the transformer box cover (6) and reducing vibration and noise; Step 2: Cover the outer periphery of the core upper positioning structure (1) with a rubber sheet and an insulating paperboard, wherein the rubber sheet is used to reduce vibration and noise, and the insulating paperboard is used to completely insulate the metal parts; Step 3, setting a pressing structure below the transformer box cover (6); Step 4: Use fasteners to firmly connect the cover plate (12) and the transformer box cover flange (11), and the pressing structure and the cover plate (12) press the rubber plate and the insulating paperboard.

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