Dry-type transformer with vibration reduction structure

Abstract

The utility model relates to the technical field of damping noise of transformers, in particular to a dry-type transformer with a vibration reduction structure. The dry-type transformer with the vibration reduction structure comprises an iron core, a machine frame and a three-phase winding, the machine frame comprises an upper clamping piece, a lower clamping piece and a base, the three-phase winding is installed between the upper clamping piece and the lower clamping piece, the lower clamping piece is installed on the base, and the vibration reduction structure is arranged on at least one of the upper clamping piece and the lower clamping piece. Elastic rubber clamping plates are fixedly arranged at the two ends of the three-phase windings arranged in rows respectively, the inner side faces of the elastic rubber clamping plates are attached to the outer side faces of the corresponding windings respectively so as to limit the windings, and a rubber buffering piece is further erected between every two adjacent phases of windings. According to the dry-type transformer with the vibration reduction structure, vibration of the transformer in the operation process can be effectively reduced, and the stability of the transformer in the working process is improved.

Description

Technical Field

[0001] This utility model relates to the field of transformer damping noise technology, and in particular to a dry-type transformer with a vibration reduction structure. Background Technology

[0002] Dry-type transformers are indispensable power equipment in power distribution systems. They utilize the law of electromagnetic induction to change the system voltage in the power grid and mainly consist of three-phase windings, a core, and a casing. Dry-type transformers vibrate and generate significant noise during operation. The vibrations are primarily caused by the core's magnetic hysteresis and the vibrations of the three-phase windings. Over long-term operation, vibrations in the internal structure can lead to transformer malfunctions and short circuits. Therefore, vibration-damping structures are necessary to reduce vibrations during operation and improve the stability of dry-type transformers.

[0003] A Chinese utility model patent with authorization announcement number CN214043380U and authorization announcement date of August 24, 2021, discloses a dry-type transformer. This dry-type transformer includes an iron core, three-phase windings, and a frame. The frame includes a base, an upper clamp, and a lower clamp. A vibration damping structure is provided between the lower clamp and the base. The vibration damping structure includes a guide groove, a guide post, a buffer post, and a damping spring. The guide groove is located on the bottom side of the lower clamp, the guide post is located in the guide groove, and the buffer post is arranged circumferentially along the guide post. Damping springs are fitted on both the guide post and the buffer post, and the length of the damping spring is greater than the length of the guide post and the buffer post. Under the action of the damping spring, the vertical vibration of the transformer can be reduced. The vibration of a dry-type transformer during operation is quite complex, and horizontal vibration also exists. However, this dry-type transformer can only achieve vertical vibration damping, and the problem of poor horizontal vibration damping leading to transformer malfunction still exists. Utility Model Content

[0004] The purpose of this invention is to provide a dry-type transformer with a vibration reduction structure to solve the problem of poor horizontal vibration reduction effect of existing dry-type transformers.

[0005] To achieve the above objectives, the dry-type transformer with vibration reduction structure of this utility model adopts the following technical solution:

[0006] A dry-type transformer with a vibration damping structure includes a core, a frame, and three-phase windings. The frame includes an upper clamp, a lower clamp, and a base. The three-phase windings are installed between the upper clamp and the lower clamp, and the lower clamp is installed on the base. On at least one of the upper and lower clamps, elastic rubber clamps are fixed at both ends of the three-phase windings arranged in a row. The inner side of the elastic rubber clamps is respectively attached to the outer side of the corresponding winding to limit its movement. A rubber buffer is also provided between two adjacent phase windings.

[0007] Furthermore, heat dissipation holes are provided on both the elastic rubber clamp and the rubber buffer.

[0008] Furthermore, the inner surface of the elastic rubber clamp is an arc-shaped surface adapted to the outer peripheral surface of the winding.

[0009] Furthermore, the elastic rubber clamp is fixedly installed on the corresponding clamp via a rubber connecting plate, with both ends of the rubber connecting plate connected to two pairs of clamping arms of the clamp respectively.

[0010] Furthermore, rubber buffers are arranged at both ends of the winding, and the rubber buffers are of equal width at both ends.

[0011] Furthermore, the two sides of the rubber buffer are arc surfaces adapted to the outer peripheral surfaces of the two adjacent windings.

[0012] Furthermore, an insulating pad is provided between the upper and lower ends of each phase winding of the three-phase winding and the corresponding clamp, and a buffer pad is provided between the insulating pad and the three-phase winding.

[0013] Furthermore, the buffer structure disposed between the base and the lower clamp includes a telescopic sleeve, and a shock-absorbing spring is disposed on the outer sleeve, with its two ends respectively pressing and engaging with the two ends of the telescopic sleeve. One end of the telescopic sleeve is connected to the base, and the other end is connected to the lower clamp.

[0014] Furthermore, the insulating pad is fixedly installed between the three-phase winding and the corresponding clamp by bolts.

[0015] Furthermore, the elastic rubber clamp is fixedly mounted on the rubber connecting plate by bolts.

[0016] Beneficial Effects: This invention relates to an improved dry-type transformer with a vibration-damping structure. The transformer features elastic rubber clamps fixed at both ends of the three-phase windings arranged in a row on at least one of the upper and lower clamps. The inner surfaces of the elastic rubber clamps fit against the outer surfaces of the corresponding windings, limiting the movement of the three-phase windings. Rubber buffers are also provided between adjacent windings. The combined action of the elastic rubber clamps and rubber buffers effectively reduces the horizontal vibration of the three-phase windings during operation, significantly improving their stability and ensuring safe and stable transformer operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of one embodiment of the dry-type transformer with a vibration reduction structure according to the present invention.

[0018] Figure 2 This is a schematic diagram showing the installation position of the buffer structure of the dry-type transformer with vibration reduction structure according to this utility model;

[0019] Figure 3 This is a schematic diagram showing the installation positions of the elastic rubber clamp and rubber buffer of the dry-type transformer with vibration reduction structure according to this utility model.

[0020] Figure 4 This is a schematic diagram of the rubber buffer component of the dry-type transformer with vibration reduction structure according to this utility model.

[0021] Figure 5 This is a schematic diagram of the elastic rubber clamp of the dry-type transformer with vibration reduction structure according to this utility model.

[0022] Figure 6 This is a schematic diagram of the rubber connecting plate of the dry-type transformer with vibration reduction structure according to this utility model;

[0023] Figure 7 This is a schematic diagram of the insulating pad of the dry-type transformer with vibration reduction structure according to the present invention.

[0024] In the diagram: 1. Iron core; 2. Three-phase winding; 3. Upper clamp on the high-voltage side; 4. Lower clamp on the high-voltage side; 5. Upper clamp on the low-voltage side; 6. Lower clamp on the low-voltage side; 7. Base; 8. Buffer structure; 9. Elastic rubber clamp; 10. Rubber buffer component; 11. Insulating pad; 12. Rubber connecting plate; 13. Buffer pad; 14. Telescopic sleeve; 15. Shock-absorbing spring; 16. High-voltage winding; 17. Low-voltage winding; 18. Heat dissipation hole. Detailed Implementation

[0025] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0026] The dry-type transformer with vibration reduction structure of this utility model limits the three-phase winding by setting rubber plates at both ends of the upper and lower clamps, and setting rubber buffers between adjacent windings to reduce the horizontal vibration of the three-phase winding during operation, thereby improving the stability of the transformer during operation.

[0027] In a basic embodiment, such as Figure 1 As shown, the dry-type transformer with vibration reduction structure of this utility model includes a core 1, a frame, and three-phase windings 2. The frame includes a high-voltage side upper clamp 3, a high-voltage side lower clamp 4, a low-voltage side upper clamp 5, a low-voltage side lower clamp 6, and a base 7. Each phase winding of the three-phase windings 2 includes a high-voltage winding 16 and a low-voltage winding 17. The high-voltage side lower clamp 4 and the low-voltage side lower clamp 6 are mounted above the base 7. The three-phase windings 2 are mounted around the high-voltage side upper clamp 3, the high-voltage side lower clamp 4, the low-voltage side upper clamp 5, and the low-voltage side lower clamp 6. Within the frame, the installation method of the iron core 1 and the three-phase winding 2 is the same as that of the prior art. The elastic rubber clamp 9 is fixedly installed on the high-voltage side upper clamp 3, the high-voltage side lower clamp 4, the low-voltage side upper clamp 5, and the low-voltage side lower clamp 6. The elastic rubber clamp 9 is located at both ends of the three-phase winding 2 arranged in a row. A rubber buffer 10 is installed between two adjacent windings of the three-phase winding 2. Under the combined action of the elastic rubber clamp 9 and the rubber buffer 10, the vibration of the three-phase winding 2 in the horizontal direction during operation can be effectively reduced.

[0028] In a preferred embodiment, such as Figure 7 As shown, heat dissipation holes 18 are provided on the elastic rubber clamp 9 and the rubber buffer 10. The heat dissipation holes 18 are laterally arranged through the side wall of the elastic rubber clamp 9, and the heat dissipation holes 18 on the rubber buffer 10 are longitudinally arranged through the rubber buffer 10. This ensures that the heat generated by the transformer during operation is dissipated quickly. The elastic rubber clamp 9 and the rubber buffer 10 reduce lateral vibration while ensuring the heat dissipation capacity of the transformer. In other embodiments, heat dissipation holes 18 can be provided only on the elastic rubber clamp 9, and the rubber buffer 10 can be placed between two adjacent windings. This has a smaller impact on the heat dissipation capacity of the transformer. Providing heat dissipation holes 18 only on the elastic rubber clamp 9 can also ensure the heat dissipation capacity of the transformer, allowing the transformer to operate safely and stably.

[0029] In a preferred embodiment, such as Figure 5As shown, the inner side of the elastic rubber clamp 9 is arc-shaped, and the inner wall of the elastic rubber clamp 9 is tightly fitted with the outer wall of the three-phase winding 2, making the structure more reasonable, the buffering effect better, and further improving the stability of the transformer during operation. In other embodiments, the inner side wall of the elastic rubber clamp 9 can be a planar structure. Elastic rubber clamps 9 are installed on the clamps corresponding to the upper and lower ends of the outer wall of the three-phase winding 2. The inner side wall of the elastic rubber clamp 9 is fitted with the outer wall of the corresponding three-phase winding. While limiting the movement of the three-phase winding 2, it can reduce the horizontal vibration of the three-phase winding 2. At the same time, the planar structure of the side wall of the elastic rubber clamp 9 makes the processing of the elastic rubber clamp 9 more convenient and reduces the processing cost.

[0030] In a preferred embodiment, such as Figure 3 As shown, a rubber connecting plate 12 is provided between the upper clamp 3 on the high-voltage side and the upper clamp 5 on the low-voltage side, and between the lower clamp 4 on the high-voltage side and the lower clamp 6 on the low-voltage side. The rubber connecting plate 12 is as follows: Figure 6 As shown, the elastic rubber clamp 9 is fixedly installed on the rubber connecting plate 12, which can further reduce the vertical vibration of the transformer during operation. In other embodiments, the elastic rubber clamp 9 can be directly fixedly installed on the high-voltage side upper clamp 3, high-voltage side lower clamp 4, low-voltage side upper clamp 5 and low-voltage side lower clamp 6 of the transformer, which can reduce the horizontal vibration of the three-phase winding 2, and at the same time fix the three-phase winding 2 to prevent the three-phase winding 2 from shifting.

[0031] In a preferred embodiment, such as Figure 4 As shown, the rubber buffer 10 is arranged at both ends of the winding. The rubber buffer 10 is an elongated section with equal width at both ends. The rubber buffer 10 is installed between the upper and lower ends of two adjacent windings of the three-phase winding 2 to improve the vibration reduction effect. In other embodiments, the rubber buffer 10 may include two horizontal parts and a vertical part in the middle connecting the two horizontal parts. The cross-sectional shape of the rubber buffer 10 is I-shaped. The width of one of the two horizontal parts is greater than the width of the other. The horizontal part with a smaller width is sandwiched between two adjacent windings, and the horizontal part with a larger width is located on the upper or lower side of the winding. The rubber buffer 10 is installed between the upper and lower ends of two adjacent windings of the three-phase winding 2. The I-shaped structure reduces the horizontal vibration of the three-phase winding 2 and also facilitates the disassembly and installation of the rubber buffer 10, thereby improving the vibration reduction effect.

[0032] In a preferred embodiment, the two side walls of the rubber buffer 10 are arc-shaped to match the corresponding transformer winding side walls, allowing the rubber buffer 10 to fit tightly against the transformer winding side walls, making the structure more reasonable and providing a more stable buffering effect in the horizontal direction of the three-phase winding 2. In other embodiments, the side walls of the rubber buffer 10 can be planar structures. The rubber buffer 10 is installed between two adjacent transformer windings to reduce the horizontal vibration of the three-phase winding 2. Alternatively, the rubber buffer 10 can be made easier to manufacture, reducing manufacturing costs.

[0033] In a preferred embodiment, such as Figure 7 As shown, insulating pads 11 are installed between the upper and lower ends of each phase winding of the three-phase winding 2 and the corresponding clamps. The insulating pads 11 fix the three-phase winding 2, ensuring that the center of the winding and the center of the core 1 are at the same horizontal level, and also preventing the three-phase winding 2 from shifting under vibration during operation. The insulating pads 11 are installed at both ends of each phase winding of the three-phase winding 2. A buffer pad 13 is provided between the insulating pad 11 and each phase winding of the three-phase winding 2. The buffer pad 13 can further reduce the vertical vibration of the three-phase winding 2, further improving the stability of the transformer. In other embodiments, a buffer pad may not be provided between the insulating pad 11 and each phase winding of the three-phase winding 2; the insulating pad 11 can be an elastic pad, further reducing the vertical vibration of the transformer.

[0034] In a preferred embodiment, such as Figure 2 As shown, the buffer structure 8 is installed between the high-voltage side lower clamp 4 and the low-voltage side lower clamp 6 and the base 7. The buffer structure 8 includes a telescopic sleeve 14, and a shock-absorbing spring 15 is installed on the outer sleeve of the telescopic sleeve 14. One end of the telescopic sleeve 14 is installed on the base 7, and the other end is connected to the low-voltage side lower clamp 6 of the high-voltage side lower clamp 4. While ensuring the overall vibration reduction effect, it can also ensure the overall structural strength of the buffer structure 8, making the buffer structure 8 less prone to damage. In other embodiments, the buffer structure 8 can use other methods to buffer the three-phase winding 2. For example, guide posts can be set on the lower clamps, guide grooves that cooperate with the guide posts can be set on the base 7, and shock-absorbing springs can be installed on the outer sleeves of the guide posts to achieve vibration reduction in the vertical direction of the transformer.

[0035] In a preferred embodiment, the insulating pad 11 is bolted between the three-phase winding 2 and the high-voltage side upper clamp 3, high-voltage side lower clamp 4, low-voltage side upper clamp 5, and low-voltage side lower clamp 6. Bolting facilitates the installation of the insulating pad 11 and also makes it convenient to replace it when needed after long-term use of the transformer. In other embodiments, the insulating pad 11 can be welded to the high-voltage side upper clamp 3, high-voltage side lower clamp 4, low-voltage side upper clamp 5, and low-voltage side lower clamp 6, which makes the structure of the insulating pad 11 more stable and less prone to loosening when fixing the three-phase winding 2.

[0036] In a preferred embodiment, the elastic rubber clamp 9 is bolted to the rubber connecting plate 12. The rubber connecting plate 12 can be bolted to the high-voltage side upper clamp 3, the high-voltage side lower clamp 4, the low-voltage side upper clamp 5, and the low-voltage side lower clamp 6. Bolting facilitates the installation of the elastic rubber clamp 9 and the rubber connecting plate 12, and also facilitates the replacement of the elastic rubber clamp 9 and the rubber connecting plate 12 when they need to be replaced after long-term use of the transformer.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A dry-type transformer having a vibration reduction structure, comprising a core, a frame, and a three-phase winding, the frame comprising an upper clamp, a lower clamp, and a base, the three-phase winding being installed between the upper clamp and the lower clamp, the lower clamp being installed on the base, characterized in that, On at least one of the upper and lower clamps, elastic rubber clamping plates are respectively arranged at both ends of the three-phase windings arranged in a row, inner sides of the elastic rubber clamping plates are respectively attached to outer sides of the corresponding windings to limit the windings, and rubber buffer members are arranged between the adjacent two-phase windings.

2. The dry-type transformer having a damping structure according to claim 1, characterized by, Heat dissipation holes are arranged on the elastic rubber clamping plates and the rubber buffer members.

3. The dry-type transformer having a damping structure according to claim 1, characterized by, The inner side of the elastic rubber clamping plate is an arc surface matched with the outer peripheral surface of the winding.

4. The dry-type transformer having a damping structure according to any one of claims 1 to 3, characterized in that, The elastic rubber clamping plate is fixedly installed on the corresponding clamp through a rubber connecting plate, and two ends of the rubber connecting plate are respectively connected to two pairs of clamping arms of the clamp.

5. The dry-type transformer having a damping structure according to any one of claims 1 to 3, characterized in that, The rubber buffer member is arranged at both ends of the winding, and the rubber buffer member is a long condition with equal width of the upper and lower ends.

6. The dry-type transformer having a damping structure according to claim 5, characterized by, The two side surfaces of the rubber buffer member are arc surfaces matched with the outer peripheral surfaces of the adjacent two windings.

7. The dry-type transformer having a damping structure according to any one of claims 1 to 3, characterized by Insulating pads are arranged between the upper and lower ends of each phase winding of the three-phase windings and the corresponding clamps, and buffer pads are arranged between the insulating pads and the three-phase windings.

8. The dry-type transformer having a damping structure according to any one of claims 1 to 3, characterized by, The buffer structure arranged between the base and the lower clamp includes an expansion sleeve, shock-absorbing springs are arranged outside the expansion sleeve and are in top pressure fit with both ends of the expansion sleeve, one end of the expansion sleeve is connected to the base, and the other end is connected to the lower clamp.

9. The dry-type transformer having a damping structure according to claim 7, characterized by, The insulating pad is fixedly installed between the three-phase windings and the corresponding clamps through a bolt.

10. The dry-type transformer having a damping structure according to claim 4, characterized by, The elastic rubber clamping plate is fixedly installed on the rubber connecting plate through a bolt.

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