Anti-vibration structure of a transformer

Abstract

This utility model relates to the field of transformer technology and discloses a seismic-resistant structure for a transformer, comprising: a transformer body and a seismic-resistant component. The seismic-resistant component includes: a first plate fixed to the bottom end of the transformer body; a vertical cylinder fixed to the bottom end of the first plate; and a slotted cylinder fitted under the outer wall of the vertical cylinder. This seismic-resistant structure, through the coordinated operation of its components, allows the operator to adjust the height of a knob along the outer wall of the vertical cylinder by rotating it. The knob's movement is adjusted by its contact with the top of a spring, changing the spring's compression and thus specifically adjusting the elastic support strength and seismic resistance coefficient at each support point. This counteracts the shift in the center of gravity caused by the misalignment of the transformer's auxiliary equipment, preventing the equipment from tilting to the unbalanced side and ensuring the transformer's horizontal installation and seismic stability.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to a seismic-resistant structure for a transformer. Background Technology

[0002] Power transformers are among the most critical electrical devices in substations, and their operational status directly affects the safety and stability of the entire power system. High-voltage and ultra-high-voltage transformers are deployed in seismically active areas, and have consistently demonstrated high vulnerability to damage during earthquakes. Damage to these transformers often leads to regional power outages, causing not only significant economic losses but also severely hindering earthquake relief efforts.

[0003] Current transformer seismic resistance measures mainly include installing anti-vibration rubber pads at the foundation, using spring-type anti-vibration frames, and adding laminated rubber seismic isolation bearings. However, the above-mentioned seismic-resistant structures generally have a common defect: because the auxiliary equipment such as oil conservators, radiators, and high-voltage bushings installed with the transformer are mostly arranged in an offset manner, the overall center of gravity of the transformer is laterally shifted. The support strength of the existing seismic bearings at the bottom of the transformer is a fixed value, and their elastic coefficient cannot be adjusted and adapted to the actual weight distribution of the transformer during the installation stage. Under seismic action, the transformer is very prone to tilting and instability on the unbalanced side, making it difficult to guarantee long-term stable and reliable seismic performance. Utility Model Content

[0004] The purpose of this invention is to provide a seismic-resistant structure for a transformer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a seismic-resistant structure for a transformer, comprising: a transformer body and a seismic-resistant component, the seismic-resistant component comprising: a first plate fixed to the bottom end of the transformer body; a vertical cylinder fixed to the bottom end of the first plate; a slotted cylinder fitted under the outer wall of the vertical cylinder; a spring fixed to the bottom end of the inner wall of the slotted cylinder; a knob abutting against the top end of the spring; the knob being threadedly connected to the outer wall of the vertical cylinder; the bottom end of the knob having an annular groove; the top end of the spring being embedded in the annular groove; and a second plate fixed to the bottom end of the slotted cylinder.

[0006] Optionally, multiple anti-seismic components are provided, and the multiple anti-seismic components are evenly fixed to both sides of the bottom end of the transformer body.

[0007] Optionally, it further includes: a limiting rod, the limiting rod being fixed to the center of the bottom end inside the groove cylinder, and the outer wall of the limiting rod being in clearance fit with the inner wall of the vertical cylinder.

[0008] Optionally, a vertical groove is provided on the front side of the outer wall of the vertical cylinder, and the interior of the vertical groove is provided with a scale.

[0009] Optionally, it further includes: a first bolt, which is threadedly connected to the front side of the knob, wherein when the first bolt abuts against the vertical cylinder, the knob is fixed relative to the vertical cylinder, and when the first bolt is separated from the vertical cylinder, the knob can rotate relative to the vertical cylinder when torque is applied.

[0010] Optionally, it further includes: a folding flexible tube, which is fitted onto the outside of the grooved tube; two T-shaped rings, which are respectively fixed to the upper and lower ends of the folding flexible tube; multiple second bolts, which pass through the T-shaped rings and are threadedly connected to the first plate and the second plate respectively; and a rubber ring, which is fixed to the surface of the T-shaped ring away from the folding flexible tube and is in a compressed state.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the anti-vibration structure of this transformer has the following advantages over traditional technology: Through the coordinated operation of various components, when installing and fixing the transformer body on the adaptable base, the operator first places the second plate, which is fixed below the first plate at the bottom of the transformer body, against the surface of the base. The second plate is then fastened to the base using expansion bolts. A spirit level is then placed on the top plane of the transformer body as an installation calibration reference. The operator rotates the knob, and the knob is adjusted up and down along the outer wall of the vertical cylinder by relying on the threaded engagement between the knob and the top of the spring. The compression of the spring is changed by the contact action between the knob and the top of the spring, and then the elastic support strength and seismic coefficient of each support point are adjusted accordingly. This counteracts the center of gravity shift caused by the offset of the transformer body's auxiliary equipment, prevents the equipment from tilting to the unbalanced side, and ensures the transformer's installation levelness and seismic stability.

[0012] After adjusting the spring compression, the operator pulls the folded flexible cylinder upwards, so that the rubber ring fixed on the T-shaped ring at the top of the folded flexible cylinder fits against the lower surface of the first plate. Then, the T-shaped ring is fastened to the first plate with the second bolt to complete the overall assembly. During the equipment operation, the spring can elastically expand and contract. At the same time, the resistance sleeve set on the outer wall of the limit rod and the inner wall of the vertical cylinder abuts against each other, providing damping for the spring deformation and realizing the shock absorption of the transformer body. The vertically arranged folded flexible cylinder can prevent external moisture and impurities from contacting the core components such as the vertical cylinder, spring, and limit rod, ensuring the long-term stable operation of the structure. Attached Figure Description

[0013] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 2 A partial sectional view in the document; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 for Figure 3 Enlarged view of point C in the middle; Figure 6 for Figure 4 A bottom view of the center knob.

[0015] In the diagram: 1. Transformer body, 2. First plate, 3. Vertical cylinder, 4. Slot cylinder, 5. Spring, 6. Knob, 7. Ring groove, 8. Second plate, 9. Limiting rod, 10. Vertical groove, 11. Scale, 12. First bolt, 13. Folding soft cylinder, 14. T-ring, 15. Second bolt, 16. Rubber ring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1 to 6 The technical solution provided by this utility model is as follows: a seismic-resistant structure for a transformer, comprising: a transformer body 1 and a seismic-resistant component, the seismic-resistant component comprising: a first plate 2, the first plate 2 being fixedly connected to the bottom end of the transformer body 1; a vertical cylinder 3, the vertical cylinder 3 being fixedly connected to the bottom end of the first plate 2; a slotted cylinder 4, the slotted cylinder 4 being fitted under the outer wall of the vertical cylinder 3; a spring 5, the bottom end of the spring 5 being fixedly connected to the inner bottom end of the slotted cylinder 4; a knob 6, the knob 6 abutting against the top end of the spring 5; the knob 6 being threadedly connected to the outer wall of the vertical cylinder 3; an annular groove 7 being provided at the bottom end of the knob 6; the top end of the spring 5 being embedded in the annular groove 7; and a second plate 8, the second plate 8 being fixedly connected to the bottom end of the slotted cylinder 4.

[0018] In the specific implementation process, it is worth noting that both the first plate 2 and the second plate 8 are made of carbon structural steel plates. The upper surface of the first plate 2 is firmly connected to the bottom of the transformer body 1 by full welding or bolts. The vertical cylinder 3 is a hollow cylinder made of seamless steel pipe, with continuous trapezoidal external threads processed on the outer wall. The thickness of the cylinder wall is determined by strength verification based on the load-bearing capacity, combining supporting rigidity and bending resistance. The slotted cylinder 4 is made of the same material as the vertical cylinder 3. The cylinder depth is set comprehensively based on the maximum compression stroke of the spring 5 and the reserved safety margin, providing a stable space for the spring 5 to accommodate and guide. The spring 5 is a cylindrical helical compression spring wound with high-quality chromium vanadium spring steel. The surface is shot-blasted and galvanized for rust prevention. The wire diameter, effective number of turns, and free height are determined according to the target rigidity. The selection of knob 6 is matched with the load-bearing capacity to ensure that it is in a reasonable compression range under rated load. Knob 6 has a disc-shaped structure with knurled texture on the outer circumference to increase friction and facilitate manual rotation by the operator. Its inner wall is machined with an internal thread that matches the external thread of the vertical cylinder 3. The depth of the annular groove 7 at the bottom of knob 6 is not less than 1.5 times the diameter of the spring wire. The inner diameter of the groove is clearance-fitted with the outer diameter of the spring 5, which can form a circumferential embedded positioning for the top of the spring, effectively preventing the spring 5 from radially slipping, deflecting or falling out during adjustment and vibration, and ensuring that the spring compression force is always uniformly transmitted along the axial direction. The second plate 8 has multiple expansion bolt mounting holes pre-set on its surface, and the lower surface is a precision-machined reference surface for tight fit with the base to ensure uniform force on the mounting base surface.

[0019] Furthermore, multiple anti-seismic components are provided, and these components are evenly fixed to both sides of the bottom end of the transformer body 1.

[0020] In the specific implementation process, it is worth noting that the anti-seismic components are usually set into four, six, or eight groups according to the transformer capacity and weight, and arranged in a symmetrical array on the left and right sides of the bottom oil tank of the transformer body 1. Each group of anti-seismic components corresponds to an independent support point. Each support point does not interfere with each other and can independently complete the adjustment of the pre-compression of the spring 5, forming a multi-point independent adjustable elastic support system. By applying a larger spring pre-compression to the support point on the heavier side, the support height and stiffness on the heavier side can be raised in a targeted manner, thereby offsetting the center of gravity shift caused by the offset auxiliary equipment such as the oil conservator, radiator, and high-voltage bushing, so that the transformer as a whole maintains a horizontal installation posture, and at the same time, the force of each group of anti-seismic components is more balanced, avoiding single-point overload.

[0021] Furthermore, it also includes: a limiting rod 9, which is fixedly connected to the center of the bottom end inside the groove cylinder 4, and the outer wall of the limiting rod 9 is clearance-fitted with the inner wall of the vertical cylinder 3.

[0022] In the specific implementation process, it is worth noting that the limiting rod 9 is made of high-strength round steel or square steel, and its surface is ground, polished and chrome-plated to improve wear resistance and smoothness. Its lower end is vertically fixed to the center of the inner bottom surface of the groove cylinder 4 to ensure coaxiality accuracy. A certain distance is maintained between the outer diameter of the limiting rod 9 and the inner wall diameter of the vertical cylinder 3 (according to the resistance sleeve fixed to the inner wall of the vertical cylinder 3). This allows the vertical cylinder 3 to slide smoothly along the axial direction of the limiting rod 9, and also forms a reliable radial constraint in the horizontal direction, effectively limiting the lateral misalignment between the vertical cylinder 3 and the groove cylinder 4. At the same time, a wear-resistant resistance sleeve can be installed at the lower end of the inner wall of the vertical cylinder 3 to form a stable friction damping pair with the outer wall of the limiting rod 9. During the reciprocating sliding process, it continuously consumes vibration energy and further improves the shock absorption effect.

[0023] Furthermore, a vertical groove 10 is provided on the front side of the outer wall of the vertical cylinder 3, and a scale 11 is provided inside the vertical groove 10.

[0024] In the specific implementation process, it is worth noting that the vertical groove 10 is opened along the axial direction of the vertical cylinder 3. The groove width and depth are moderate, which not only does not weaken the overall structural strength of the vertical cylinder 3, but also accommodates the scale 11 markings and facilitates observation and reading. The scale 11 can be laser-etched onto the bottom plane of the vertical groove 10, evenly distributed along the axial direction, with a minimum graduation value of 1mm. The range fully covers the entire adjustable stroke range of the knob 6. When the operator rotates the knob 6 to adjust the compression of the spring 5, the lifting displacement value can be read intuitively through the scale 11 value aligned with the lower edge of the knob 6, realizing quantitative and precise visual adjustment, ensuring that the adjustment of multiple support points is accurate and controllable, and facilitating on-site installation and debugging as well as calibration and reset during later maintenance.

[0025] Furthermore, it also includes: a first bolt 12, which is threadedly connected to the front side of the knob 6. When the first bolt 12 abuts against the vertical cylinder 3, the knob 6 is fixed relative to the vertical cylinder 3. When the first bolt 12 is separated from the vertical cylinder 3, the knob 6 can rotate relative to the vertical cylinder 3 when torque is applied.

[0026] In the specific implementation process, it is worth noting that after the pre-compression of spring 5 is adjusted to the target value, the first bolt 12 is tightened so that its end is tightly pressed against the bottom surface of the vertical groove 10 on the outer wall of the vertical cylinder 3. The circumferential locking between the knob 6 and the vertical cylinder 3 is achieved by relying on the end face friction. This can effectively prevent the threaded pair from loosening and rotating on its own due to continuous vibration during long-term operation of the equipment, avoid the unexpected attenuation of the pre-tightening force of spring 5, and thus ensure the long-term stability of the seismic support stiffness and maintain the designed seismic performance without decline.

[0027] Furthermore, it also includes: a folding flexible tube 13, which is fitted onto the outside of the grooved tube 4; two T-shaped rings 14, which are respectively fixed to the upper and lower ends of the folding flexible tube 13; multiple second bolts 15, which pass through the T-shaped rings 14 and are threaded to the first plate 2 and the second plate 8 respectively; and a rubber ring 16, which is fixed to the surface of the T-shaped rings 14 away from the folding flexible tube 13 and is in a compressed state.

[0028] In the specific implementation process, it is worth noting that the folding flexible tube 13 is made of multi-layer corrugated pipe structure using fluororubber or modified PVC with excellent weather resistance and oil resistance. It has a large axial expansion ratio and can freely expand and contract synchronously with the compression and rebound of the spring 5 without generating additional resistance. The working temperature range covers extreme outdoor environmental conditions. The T-shaped rings 14 at the upper and lower ends are ring components made of rigid plastic or metal with a T-shaped cross-section. Their radial flanges are used to open bolt mounting holes. The axial tube section is embedded at the end of the folding flexible tube 13 and firmly combined by bonding or vulcanization, which plays a role in end shaping and reinforcement. At least four second bolts 15 are evenly arranged around the circumference of the T-shaped rings 14. During installation, they are tightened gradually in a diagonal sequence. To ensure uniform distribution of end-face clamping force, the rubber ring 16 is made of nitrile rubber or silicone rubber with an O-shaped cross-section. It is embedded in the end face of the T-ring 14. Under the pre-tightening force of the second bolt 15, the rubber ring 16 undergoes elastic deformation and tightly adheres to the surfaces of the first plate 2 and the second plate 8, forming a continuous and reliable static seal on the end face. This creates a complete enclosed protective space around the core seismic components such as the vertical cylinder 3, the groove cylinder 4, the spring 5, and the limit rod 9, effectively preventing external rainwater, moisture, dust, salt spray, and corrosive media from intruding into the interior. This avoids problems such as rust and jamming of the threaded pair, corrosion fatigue of the spring 5, and abrasive wear of the sliding surface, ensuring the flexibility and reliability of the seismic adjustment mechanism in long-term operation and extending the service life of the overall structure.

[0029] Working principle: Leveling and Adaptation Principle: When installing and fixing the transformer body 1 on the adapter base, the operator first attaches the second plate 8, which is fixed below the first plate 2 at the bottom of the transformer body 1, to the surface of the base. The bottom base is then positioned and tightened using expansion bolts. A spirit level is then placed on the top plane of the transformer body 1 as a reference for installation calibration. The knobs 6 at each support point are rotated one by one. With the help of the threaded transmission between the knobs 6 and the outer wall of the vertical cylinder 3, the knobs can be continuously adjusted up and down along the axial direction of the vertical cylinder. The pre-compression amount is changed by pressing the top of the spring 5 through the bottom annular groove 7. During the adjustment, the compression stroke can be read by referring to the scale 11 in the vertical groove 10 on the front side of the vertical cylinder 3. This allows for independent and quantitative adjustment of the elastic support strength and stiffness coefficient of each support point. After adjustment, the first bolt 12 on the front side of the knob 6 is tightened for locking and positioning. This effectively counteracts the lateral shift of the center of gravity of the transformer body 1 caused by the offset arrangement of auxiliary equipment such as the oil conservator, radiator, and high-voltage bushing, preventing the equipment from tilting to the unbalanced side and ensuring the overall installation levelness of the transformer and the balance of force on multiple support points.

[0030] Earthquake-resistant buffering principle: When the equipment encounters earthquakes or other vibrations during operation, ground vibrations are transmitted to the slot cylinder 4 via the base and the second plate 8. The spring 5 absorbs most of the vertical vibration impact energy through axial elastic expansion and contraction deformation. At the same time, it releases a small amount of lateral displacement in conjunction with the relative sliding of the slot cylinder 4 and the vertical cylinder 3, weakening the direct transmission of horizontal seismic loads. Meanwhile, the limiting rod 9, fixed in the center of the slot cylinder 4, slides coaxially relative to the inner cavity of the vertical cylinder 3. It not only plays a radial guiding role and prevents the support structure from lateral swaying and instability, but also provides additional damping energy dissipation for the reciprocating elastic deformation of the spring 5 through the abutting friction between its outer wall and the resistance sleeve of the inner wall of the vertical cylinder 3. This rapidly attenuates the vibration amplitude and suppresses the risk of resonance. The synergistic effect of the elastic energy absorption and damping friction energy dissipation of the spring 5 reduces the transmission efficiency of the seismic load to the transformer body 1, effectively protecting the windings, bushings and other precision components from impact damage.

[0031] Sealing and protection principle: The vertically arranged folding flexible tube 13 is coaxially enclosed on the outside of the seismic support components such as the grooved tube 4 and the vertical tube 3. Its upper and lower ends are fastened to the first plate 2 and the second plate 8 respectively by T-rings 14 and second bolts 15. In the assembled state, the rubber ring 16 on the end face of the T-ring 14 is in a compressed and sealed state under the pre-tightening force of the bolts, forming a complete closed protective space around the seismic components. The folding flexible tube 13 adopts an axially expandable corrugated tube or an anti-aging fluororubber structure, which can expand and contract synchronously with the compression and rebound of the spring 5 without affecting the normal working stroke of the seismic support structure. At the same time, it can effectively block external water vapor, dust, salt spray and corrosive impurities from entering the interior, and prevent the core moving parts such as the threaded pair of the vertical tube 3, the spring 5, and the limit rod 9 from rusting, jamming or abrasive wear, ensuring the long-term flexibility and reliability of the seismic adjustment mechanism and extending the service life of the overall structure.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A seismic-resistant structure for a transformer, characterized in that, include: The transformer body (1) and the seismic-resistant components, the seismic-resistant components including: The first plate (2) is fixed to the bottom end of the transformer body (1); A vertical cylinder (3) is fixed to the bottom end of the first plate (2); The grooved cylinder (4) is fitted under the outer wall of the vertical cylinder (3); Spring (5), the bottom end of which is fixed to the bottom end of the inner cavity of the groove (4); A knob (6) abuts against the top of the spring (5), the knob (6) is threaded to the outer wall of the vertical cylinder (3), and an annular groove (7) is provided at the bottom of the knob (6), and the top of the spring (5) is embedded in the annular groove (7). The second plate (8) is fixed to the bottom end of the groove cylinder (4).

2. The anti-seismic structure of a transformer according to claim 1, characterized in that, Multiple anti-seismic components are provided, and the multiple anti-seismic components are evenly fixed to both sides of the bottom end of the transformer body (1).

3. The anti-seismic structure of a transformer according to claim 1, characterized in that, Also includes: The limiting rod (9) is fixed to the center of the bottom end inside the groove cylinder (4), and the outer wall of the limiting rod (9) is in clearance fit with the inner wall of the vertical cylinder (3).

4. The anti-seismic structure of a transformer according to claim 1, characterized in that, The outer wall of the vertical cylinder (3) is provided with a vertical groove (10), and the interior of the vertical groove (10) is provided with a scale (11).

5. The anti-seismic structure of a transformer according to claim 1, characterized in that, Also includes: The first bolt (12) is threaded to the front side of the knob (6). When the first bolt (12) abuts against the vertical cylinder (3), the knob (6) is fixed relative to the vertical cylinder (3). When the first bolt (12) is separated from the vertical cylinder (3), the knob (6) can rotate relative to the vertical cylinder (3) when torque is applied.

6. The anti-seismic structure of a transformer according to claim 1, characterized in that, Also includes: A folding soft tube (13) is fitted onto the outside of the grooved tube (4); T-rings (14), two T-rings (14) are provided, and the two T-rings (14) are respectively fixed to the upper and lower ends of the folding soft tube (13); The second bolt (15) is provided in multiple ways. The multiple second bolts (15) pass through the T-shaped ring (14) and are threadedly connected to the first plate (2) and the second plate (8) respectively. A rubber ring (16) is fixed to the surface of the T-ring (14) away from the folded soft tube (13), and the rubber ring (16) is in a compressed state.

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