A transformer having a noise reducing housing

Abstract

The utility model relates to transformer technical field discloses a transformer with noise reduction shell, include: bottom plate, casing, the casing is welded in the upper surface of bottom plate, the casing includes two square tubes, two the square tubes are covered from inside to outside, there is a gap between two square tubes, recess is all set up in the bottom of two square tubes between. This transformer with noise reduction shell, through the cooperation between various components, when the operator welds the casing on the top of bottom plate, the heat generated by welding can be blocked by the heat insulation pad and the heat insulation ring mostly, effectively reduces the conduction of welding heat to the noise reduction layer in the gap between two square tubes, avoids the irreversible damage such as melting shrinkage, deformation damage of noise reduction layer caused by square tube heat conduction, prevents the formation of annular sound insulation vacancy zone at the welding joint position, guarantees the continuity of the shell sound insulation structure, effectively maintains the overall sound insulation performance of noise reduction shell.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to a transformer with a noise-reducing outer shell. Background Technology

[0002] Distribution transformers are often installed in noise-sensitive areas such as residential communities, municipal green belts, and schools. The magnetostriction of the transformer core and the electromagnetic vibration of the windings continuously radiate low-frequency noise. To suppress the outward spread of noise, current technology generally equips transformers with enclosed noise-reducing shells. Compared with single-layer steel plate shells, composite shells composed of double-layer metal plates sandwiched with composite sound insulation cotton have gradually become the mainstream choice for transformer noise-reducing shells due to their excellent mid-to-low frequency sound insulation performance. This type of composite shell uniformly adopts a three-layer sandwich structure of "outer metal panel, inner metal panel, and middle composite sound insulation cotton", relying on the sandwiched sound insulation cotton to absorb transmitted sound waves and block the leakage of airborne noise.

[0003] The conventional transformer noise reduction enclosure is a box-shaped enclosed structure, assembled from four vertically arranged composite vertical plates and one horizontally arranged composite base plate. To ensure the overall structural rigidity of the enclosure and its outdoor waterproof and dustproof performance, the industry standard adopts an arc welding process for assembly. This involves directly abutting the bottom end face of the composite vertical plate against the upper surface of the composite base plate, and continuously welding along the joint to fix it, so that the vertical plate and the base plate form a rigid integrated structure.

[0004] However, the above-mentioned welding and assembly process has inherent structural defects: during the arc welding operation, the metal plate has excellent thermal conductivity, and the welding residual heat will be quickly conducted inward along the inner and outer metal panels of the vertical plate. The composite sound insulation cotton inside the vertical plate is tightly filled between the two metal panels, and the bottom sound insulation cotton is close to the welding joint. The composite sound insulation cotton has limited heat resistance, and the welding residual heat conducted by the metal plate is prone to damage such as melting and shrinkage of the composite sound insulation cotton. A ring-shaped sound insulation gap appears at the welding joint of the vertical plate and the bottom plate, which breaks the overall continuous sound insulation structure of the shell and weakens the overall sound insulation effect of the noise reduction shell. Utility Model Content

[0005] The purpose of this invention is to provide a transformer with a noise-reducing housing to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a transformer with a noise-reducing outer shell, comprising: a base plate, a cover, the cover being welded to the upper surface of the base plate, the cover comprising two square tubes, the two square tubes being arranged from the inside out, a gap between the two square tubes, a groove being formed at the bottom end of each of the two square tubes, a plurality of insertion holes being formed on the inner surface of the groove, a noise-reducing layer, the noise-reducing layer being placed in the gap, a heat insulation pad, the heat insulation pad being disposed inside the groove, a protruding rod, a plurality of protruding rods being provided, the plurality of protruding rods being fixed to the surface of the heat insulation pad facing the insertion holes, the protruding rods being inserted and connected to the insertion holes, and a heat insulation ring, the heat insulation ring being located at the bottom end inside the gap, the bottom end of the heat insulation ring being in contact with the base plate, and the top end of the heat insulation ring being in contact with the noise-reducing layer.

[0007] Optionally, the end of the protruding rod away from the heat insulation pad has a tapered structure.

[0008] Optionally, the noise reduction layer is a graphite-modified glass fiber damping felt.

[0009] Optionally, it further includes: a one-way valve, the one-way valve being fixed to the outside of the housing, the air inlet end of the one-way valve being connected to the inside of the gap, and an internal threaded connector, the internal threaded connector being fixed to the air outlet end of the one-way valve.

[0010] Optionally, it further includes: a cylinder sleeved on the outside of the internal threaded joint; a threaded rod threadedly connected to the internal threaded joint and fixedly connected to the cylinder; and a PTFE ring abutting between the cylinder and the cover.

[0011] Optionally, it further includes: two support feet, both of which are fixed to the bottom end of the base plate; and a buffer pad, which is fixed to the bottom end of the support feet.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This transformer with a noise-reducing housing has the following advantages: Through the coordinated operation of various components, when the operator welds the shell onto the base plate, most of the heat generated during welding can be blocked by the heat insulation pad and heat insulation ring, effectively reducing the conduction of welding heat to the noise reduction layer in the gap between the two square tubes. This avoids irreversible damage to the noise reduction layer due to melting shrinkage, deformation and breakage caused by heat conduction from the square tubes, prevents the formation of annular sound insulation gaps at the welding joint, ensures the continuity of the shell's sound insulation structure, and effectively maintains the overall sound insulation performance of the noise reduction shell.

[0013] Through the coordinated operation of various components, after assembly, the operator connects the one-way valve to the vacuum pipe of the external vacuum equipment through the internal threaded connector, starts the external vacuum equipment, and performs vacuuming operation on the gap between the two square cylinders through the internal threaded connector and the one-way valve. After the gap between the two square cylinders reaches a near-vacuum state, the noise reduction performance of the cover can be further improved.

[0014] Through the coordinated operation of various components, after the vacuuming operation is completed, the operator puts the cylindrical sleeve on the outside of the internal threaded joint and screws the threaded rod fixed to the cylindrical sleeve into the internal threaded joint, so that the PTFE ring is clamped between the cylindrical sleeve and the cover. The cylindrical sleeve and the PTFE ring can protect the connection between the one-way valve and the cover, ensuring that the connection remains sealed for a long time, so that the gap between the two square cylinders can be maintained in a near-vacuum state for a long time.

[0015] Through the coordinated operation of various components, after the transformer is installed and put into use, the buffer pads at the bottom of the support feet directly contact the mounting base. The buffer pads can reduce the vibration transmitted to the mounting base during transformer operation and further block the structural sound transmission caused by vibration transmission. Attached Figure Description

[0016] 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 elements are not necessarily drawn to scale.

[0017] 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 Enlarged view of point B in the middle; Figure 4 for Figure 2 A magnified view of point C in the middle.

[0018] In the diagram: 1. Base plate, 2. Cover, 3. Square tube, 4. Noise reduction layer, 5. Groove, 6. Heat insulation pad, 7. Protruding rod, 8. Insertion hole, 9. One-way valve, 10. Internal threaded joint, 11. Cylinder, 12. Threaded rod, 13. PTFE ring, 14. Support foot, 15. Buffer pad, 16. Heat insulation ring. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1 to 4 This utility model provides a technical solution: a transformer with a noise-reducing shell, comprising: a base plate 1, a cover 2, the cover 2 being welded to the upper surface of the base plate 1, the cover 2 including two square tubes 3, the two square tubes 3 being arranged from the inside to the outside, with a gap between the two square tubes 3, and a groove 5 being provided at the bottom end of each of the two square tubes 3, with multiple insertion holes 8 provided on the inner surface of the groove 5, a noise-reducing layer 4, the noise-reducing layer 4 being placed in the gap, a heat insulation pad 6, the heat insulation pad 6 being disposed inside the groove 5, a protruding rod 7, multiple protruding rods 7 being provided, the multiple protruding rods 7 being fixed to the surface of the heat insulation pad 6 near the insertion holes 8, the protruding rods 7 being inserted and connected to the insertion holes 8, and a heat insulation ring 16, the heat insulation ring 16 being located at the bottom end inside the gap, the bottom end of the heat insulation ring 16 being in contact with the base plate 1, and the top end of the heat insulation ring 16 being in contact with the noise-reducing layer 4.

[0021] In the specific implementation process, it is worth noting that both the heat insulation pad 6 and the heat insulation ring 16 are made of aluminum silicate ceramic fiber board, which can withstand the instantaneous high temperature generated by electric arc welding and effectively block the conduction of welding residual heat to the interior of the interlayer. The protruding rod 7 is made of aluminum silicate ceramic fiber rod of the same material as the heat insulation pad 6, which is cut and processed separately. It is bonded to the heat insulation pad 6 as a whole by high temperature resistant inorganic aluminum silicate adhesive. The bonding surface is roughened in advance. The two square tubes 3 are made of cold rolled steel plate and are coaxial inside and out with the same gap width. The groove 5 is continuously opened along the bottom circumference of the square tube 3, and the depth matches the thickness of the heat insulation pad 6. Multiple insertion holes 8 are arranged equidistantly along the circumference of the groove 5, and the hole diameter is slightly larger than the rod diameter of the protruding rod 7. The heat insulation ring 16 is a closed rectangular ring structure. The outer contour size is consistent with the gap size between the two square tubes 3. After installation, it can completely fill the annular space at the bottom of the gap and fit against the inner wall of the two square tubes 3.

[0022] Furthermore, the end of the protruding rod 7 away from the heat insulation pad 6 has a tapered structure.

[0023] In the specific implementation process, it is worth noting that the tapered end can reduce the difficulty of alignment during assembly, and even if there is a small positional deviation, it can guide the protrusion 7 to be smoothly inserted into the insertion hole 8.

[0024] Furthermore, the noise reduction layer 4 is a graphite-modified glass fiber damping felt.

[0025] In the specific implementation process, it is worth noting that the noise reduction layer 4 is a three-layer composite sandwich structure. The middle layer is a graphite modified glass fiber substrate, and each side surface is composited with a thin glass fiber non-woven fabric. The whole is integrally formed by hot pressing process. This material has both low-frequency sound insulation and lateral auxiliary heat conduction properties. It can absorb the air noise radiated outward by the transformer and conduct the heat of the outer wall of the transformer to the two square cylinders 3 on both sides to dissipate outward.

[0026] Furthermore, the transformer with a noise-reducing housing also includes: a one-way valve 9, which is fixed to the outside of the housing 2, with the air inlet end of the one-way valve 9 connected to the inside of the gap, and an internal threaded connector 10, which is fixed to the air outlet end of the one-way valve 9.

[0027] In the specific implementation process, it is worth noting that the one-way valve 9 is installed on the upper side wall of the outer square cylinder 3. Its air inlet end extends into the gap through the wall plate of the outer square cylinder 3. The one-way valve 9 only allows the gas inside the gap to be discharged outward in one direction, which can prevent the outside air from flowing back into the interlayer after the vacuuming operation is completed. The internal threaded connector 10 is fixedly connected to the air outlet end of the one-way valve 9. The internal threaded connector 10 adopts the national standard pipe thread interface and can be directly connected to the pipe connector of the vacuuming equipment commonly used in the market.

[0028] Furthermore, the transformer with a noise-reducing housing also includes: a cylinder 11, which is sleeved on the outside of the internal threaded joint 10; a threaded rod 12, which is threadedly connected to the internal threaded joint 10 and fixedly connected to the cylinder 11; and a PTFE ring 13, which abuts between the cylinder 11 and the housing 2.

[0029] In the specific implementation process, it is worth noting that the cylinder 11 can completely cover the internal threaded joint 10 and the one-way valve 9, which plays a role in physical protection. The threaded rod 12 is coaxially welded to the center of the inner bottom surface of the cylinder 11. The PTFE ring 13 is a flat ring structure and is sleeved on the inner side of the open end of the cylinder 11. When the threaded rod 12 is tightened, the PTFE ring 13 is evenly pressed between the end face of the cylinder 11 and the outer wall of the cover 2, forming a reliable sealing surface to prevent outside air from seeping into the interlayer from the threaded connection.

[0030] Furthermore, the transformer with a noise-reducing housing also includes: two support feet 14, both of which are fixed to the bottom end of the base plate 1, and a buffer pad 15, which is fixed to the bottom end of the support feet 14.

[0031] In the specific implementation process, it is worth noting that the two support feet 14 are symmetrically welded to the bottom of the base plate 1, which have sufficient load-bearing strength to stably support the overall weight of the transformer. The buffer pad 15 is made of high-damping nitrile rubber. The buffer pad 15 can absorb the vibration energy generated by the operation of the transformer through its own elastic deformation, block the transmission path of vibration to the mounting base, and reduce structural sound transmission.

[0032] Working principle: Welding heat insulation principle: When the operator welds the cover 2 to the base plate 1, the heat insulation pad 6 and the heat insulation ring 16 together block the conduction path of welding heat to the interior of the interlayer. The high-temperature residual heat generated by welding is effectively intercepted by the heat insulation structure, which greatly reduces the heat transferred to the noise reduction layer 4, avoids irreversible damage to the noise reduction layer 4 due to high temperature melting shrinkage, deformation and breakage, prevents the formation of a ring-shaped sound insulation gap at the weld joint, and ensures the continuity of the overall sound insulation structure of the shell.

[0033] Vacuum sound insulation principle: After assembly, a vacuum is evacuated between the two square tubes 3 using a one-way valve 9, bringing the interlayer space to a near-vacuum state. Since air is the main medium for sound wave propagation, a vacuum environment can reduce the efficiency of air-borne sound transmission, especially providing excellent blocking effect for low-frequency noise generated by the transformer, further improving the overall noise reduction performance of the casing 2.

[0034] Sealing and protection principle: After the vacuuming operation is completed, the threaded rod 12 is screwed into the internal threaded joint 10, which drives the cylinder 11 to press the PTFE ring 13 to form a tight sealing interface. This forms a physical protection and sealing barrier at the connection between the one-way valve 9 and the cover 2, preventing outside air from seeping into the interlayer space. This facilitates the long-term sealing of the connection and ensures that the gap between the two square cylinders 3 can be maintained in a near-vacuum state for a long time, thus ensuring the durability of the noise reduction performance.

[0035] Vibration isolation principle: The vibration generated during transformer operation is transmitted to the buffer pad 15 at the bottom via the support foot 14. The buffer pad 15 uses its own elastic deformation to attenuate the vibration energy, weaken the vibration amplitude transmitted to the mounting base, effectively block the path of vibration propagation outward through the building structure, and further reduce the structural noise generated by the transformer operation.

[0036] 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 transformer with a noise-reducing housing, characterized in that, include: Base plate (1); Cover (2), the cover (2) is welded to the upper surface of the base plate (1), the cover (2) includes two square tubes (3), the two square tubes (3) are arranged from the inside to the outside, there is a gap between the two square tubes (3), and the bottom ends of the two square tubes (3) are provided with grooves (5), and the inner surface of the grooves (5) is provided with multiple insertion holes (8). A noise reduction layer (4) is placed in the gap; A heat insulation pad (6) is disposed inside the groove (5); A protruding rod (7) is provided in multiple ways. The multiple protruding rods (7) are fixed to the surface of the heat insulation pad (6) that is close to the insertion hole (8). The protruding rod (7) is inserted into the insertion hole (8). The heat insulation ring (16) is located at the bottom of the gap. The bottom of the heat insulation ring (16) is in contact with the base plate (1), and the top of the heat insulation ring (16) is in contact with the noise reduction layer (4).

2. A transformer with a noise-reducing casing according to claim 1, characterized in that, The end of the protruding rod (7) away from the heat insulation pad (6) has a tapered structure.

3. A transformer with a noise-reducing casing according to claim 1, characterized in that, The noise reduction layer (4) is a graphite-modified glass fiber damping felt.

4. A transformer with a noise-reducing casing according to claim 1, characterized in that, Also includes: One-way valve (9), the one-way valve (9) is fixed to the outside of the cover (2), and the air inlet of the one-way valve (9) is connected to the inside of the gap; An internal threaded connector (10) is fixed to the outlet end of the one-way valve (9).

5. A transformer with a noise-reducing housing according to claim 4, characterized in that, Also includes: A cylindrical tube (11) is fitted over the outside of the internal threaded joint (10); A threaded rod (12) is threadedly connected to the internal threaded connector (10), and the threaded rod (12) is fixedly connected to the cylinder (11); A PTFE ring (13) abuts between the cylinder (11) and the casing (2).

6. A transformer with a noise-reducing casing according to claim 1, characterized in that, Also includes: Support feet (14), two support feet (14) are provided, and both support feet (14) are fixed to the bottom end of the base plate (1); A cushioning pad (15) is fixed to the bottom end of the support foot (14).

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