Low-noise three-phase dry-type transformer

Abstract

The invention relates to the technical field of transformers, and particularly discloses a low-noise three-phase dry-type transformer which comprises a transformer body. The transformer body comprises an iron core formed by a plurality of silicon steel sheets, a secondary coil wound on the iron core, a first elastic isolation piece located in the circumferential direction of the secondary coil, and a primary coil wound on the first elastic isolation piece and extruding the first elastic isolation piece towards the direction of the iron core, and a mounting cavity is formed in the middle of the iron core; and a pre-pressing piece used for reducing a gap between the silicon steel sheets when the primary coil and the secondary coil are tightly wound is arranged in the mounting cavity, and a locking device for locking the iron core in the vertical direction is further included. According to the invention, gaps between the silicon steel sheets forming the iron core can be effectively reduced, absorption and dissipation of vibration energy are facilitated, and generation of noise is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a low-noise three-phase dry-type transformer. Background Art

[0002] A transformer is a device that can change AC voltage. It operates by using the principle of electromagnetic induction. A transformer is essentially composed of a primary coil, a secondary coil, and an iron core. The iron core is made of several laminated silicon steel sheets. Its primary functions are voltage conversion and isolation, as well as stabilization and current conversion. During operation, a transformer generates heat due to the loss of eddy currents in the iron core or the flow of load current through the transformer windings.

[0003] In existing technology, brackets are simply installed at the top and bottom of the core. These brackets are connected by bolts to secure the core vertically. When the silicon steel sheets are not tightly fitted together, tiny gaps will exist between the sheets. During transformer operation, the silicon steel sheets in the core undergo magnetostriction in the presence of an alternating magnetic field. This means that the sheets periodically expand and contract as the magnetic field changes. The vibrations generated by this magnetostriction are hindered and disrupted by the gaps. This prevents the vibration energy from being effectively transmitted and dissipated. Instead, it reflects and accumulates between the sheets, amplifying the magnetostrictive vibrations and increasing noise. Summary of the Invention

[0004] The object of the present invention is to provide a low-noise three-phase dry-type transformer, which can effectively reduce the gap between silicon steel sheets constituting the iron core, help absorb and dissipate vibration energy, and reduce noise generation.

[0005] In order to solve the above technical problems, the present invention adopts the following solutions: A low-noise three-phase dry-type transformer includes a transformer body, which includes an iron core composed of several silicon steel sheets, a secondary coil wound on the iron core, a first elastic isolator located circumferentially of the secondary coil, and a primary coil wound on the first elastic isolator and pressing the first elastic isolator toward the iron core. A mounting cavity is provided in the middle of the iron core, and a pre-pressing member is provided in the mounting cavity for reducing the gap between the silicon steel sheets when the primary coil and the secondary coil are tightly wound. The transformer body also includes a locking device for locking the iron core vertically.

[0006] In this solution, the pre-stressed part in the middle of the iron core plays a role when the primary coil and secondary coil are tightly wound. When the coil is wound tightly, the iron core on both sides of the installation cavity will squeeze the pre-stressed part. The reaction force generated by the pre-stressed part will exert pressure on the silicon steel sheets on both sides, effectively reducing the gap between the silicon steel sheets. This can reduce the reflection and superposition of vibration energy generated by the gap between the silicon steel sheets in the alternating magnetic field, reduce magnetostrictive vibration, and thus reduce noise.

[0007] The first elastic isolator is located circumferentially of the secondary coil, and the primary coil is wound on it and squeezed toward the iron core. The elastic isolator has good elasticity and buffering properties. It can absorb and isolate the vibration transmission between the primary coil and the secondary coil and between the coil and the iron core. When the coil is energized to generate electromagnetic force causing vibration, the elastic isolator can consume part of the vibration energy, reduce the propagation of vibration to the iron core and other components, and thus reduce noise.

[0008] During the operation of the transformer, the coil and the core may undergo relative displacement due to thermal expansion and contraction, generating friction noise. The first elastic isolator can provide a certain buffer space to reduce direct contact and friction between the coil and the core, thereby reducing the generation of friction noise.

[0009] When the coil is wound, the first elastic isolator is squeezed, and the elastic force stored in the first elastic isolator will act in the opposite direction on the coil. The reverse elastic force will also act on the iron core through the coil, thereby further squeezing the silicon steel sheets and reducing the gap between the silicon steel sheets, further reducing the noise generated by magnetostrictive vibration.

[0010] The locking device locks the iron core vertically, which can enhance the overall structural stability of the iron core. When the transformer is running, the iron core will be affected by multiple forces such as electromagnetic force and thermal stress, which is prone to vibration. The locking device limits the vertical displacement of the iron core, reduces the vibration of the iron core caused by the force, and thus reduces noise.

[0011] The synergistic effect of multiple components, including the preload element, the first elastic isolator, and the locking device, effectively reduces transformer operating noise by reducing gaps between silicon steel sheets, isolating vibration transmission, and enhancing the stability of the core structure. Compared to traditional three-phase dry-type transformers, this system reduces noise levels by 15-25 decibels, meeting the requirements of locations with high noise requirements, such as hospitals, schools, and distribution rooms near residential areas.

[0012] Optionally, the iron core is divided into a first iron core and a second iron core, and an installation cavity is formed between the first iron core and the second iron core. The pre-pressed part is installed in the installation cavity. After the primary coil and the secondary coil are wound, the pre-pressed part is in a state of being squeezed and deformed by the first iron core and the second iron core.

[0013] Optionally, the pre-pressed part is a corrugated stainless steel plate, the cross section of the stainless steel plate is wavy, the wave crests of the stainless steel plate act on the inner wall of the first iron core, and the wave troughs of the stainless steel plate act on the inner wall of the second iron core.

[0014] Optionally, two sides of the stainless steel plate respectively form vertical first heat dissipation channels with the inner wall of the first iron core and the inner wall of the second iron core.

[0015] Optionally, a second heat dissipation channel is formed between the secondary coil and the primary coil, and a first elastic isolator is inserted into the second heat dissipation channel and separates the primary coil and the secondary coil to form the second heat dissipation channel. The first elastic isolator is an I-shaped rubber strip.

[0016] Optionally, the primary coil has multiple layers, each layer of primary coil is wound by several turns of glass fiber wrapped wire, and a second elastic isolation piece is provided between two adjacent layers of primary coils. The second elastic isolation piece separates the two adjacent layers of primary coils to form a third heat dissipation channel, and the second elastic isolation piece is an I-shaped rubber strip.

[0017] Optionally, the secondary coil has multiple layers, each layer of the secondary coil is wound by several turns of glass fiber wrapped wire, and a third elastic isolation piece is provided between two adjacent layers of the secondary coils. The third elastic isolation piece separates the two adjacent layers of the secondary coils to form a fourth heat dissipation channel, and the third elastic isolation piece is an I-shaped rubber strip.

[0018] Optionally, the locking device includes an L-shaped upper pressure plate and a lower pressure plate, the upper pressure plate is arranged on both sides of the upper end of the iron core, and the lower pressure plate is arranged on both sides of the lower end of the iron core. Corresponding fixing seats are provided on the sides of the upper pressure plate and the lower pressure plate, and the two fixing seats located at the upper and lower ends are fixed by bolts.

[0019] Optionally, the bottom surface of the lower pressing plate is connected to a first mounting seat, the ends of the upper pressing plate and the lower pressing plate are provided with a second mounting seat, and the first mounting seat and the second mounting seat are provided with waist-shaped mounting holes.

[0020] Optionally, a windshield is provided below the upper pressure plate and is located outside the primary coil. The windshield is an insulating plate. There is a gap between the windshield and the primary coil, and the windshield is connected with bolts.

[0021] The present invention has the beneficial effects: The present invention utilizes a preload element, a first elastic isolator, and a locking mechanism to effectively reduce transformer operating noise by reducing gaps between silicon steel sheets, isolating vibration transmission, and enhancing core structural stability. Compared to traditional three-phase dry-type transformers, this design reduces noise levels by 5-10 decibels, meeting the requirements of noise-sensitive locations such as hospitals, schools, and distribution rooms near residential areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 for Figure 1 A local enlarged view of point A in FIG; Figure 3 This is a schematic diagram of the structure when the windshield is not installed; Figure 4 for Figure 3 A partial enlarged view of point B in the middle; Figure 5 It is a three-dimensional diagram of a corrugated stainless steel plate; Figure 6 for Figure 3 A top view of Figure 7 This is a structural diagram of the pre-pressed component being an elastic rubber strip; Figure 8 for Figure 7 A partial enlarged view of point C in the middle.

[0023] Figure markings: 1-iron core, 101-first iron core, 102-second iron core, 2-installation cavity, 3-pre-pressed part, 301-stainless steel plate, 3011-peak point, 3012-trough point, 302-elastic rubber strip, 4-primary coil, 5-secondary coil, 6-first elastic isolation part, 7-bolt, 8-first mounting seat, 9-third elastic isolation part, 10-wind shield, 11-waist-shaped mounting hole, 12-second mounting seat, 13-upper pressure plate, 14-fixed seat, 15-lower pressure plate, 16-first heat dissipation channel, 17-second heat dissipation channel, 18-third heat dissipation channel, 19-fourth heat dissipation channel, 20-second elastic isolation part. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0025] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0026] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "having," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts. Example

[0027] A low-noise three-phase dry-type transformer includes a transformer body, which includes an iron core 1 composed of several silicon steel sheets, a secondary coil 5 wound on the iron core 1, a first elastic isolator 6 located circumferentially of the secondary coil 5, and a primary coil 4 wound on the first elastic isolator 6 and pressing the first elastic isolator 6 toward the iron core 1. An installation cavity 2 is provided in the middle of the iron core 1, and a pre-pressing member 3 is provided in the installation cavity 2 for reducing the gap between the silicon steel sheets when the primary coil 4 and the secondary coil 5 are tightly wound. The transformer body also includes a locking device for locking the iron core 1 vertically.

[0028] In this embodiment, Figure 1 As shown, under the action of the alternating magnetic field, the silicon steel sheets will periodically elongate and shorten, generating vibration and noise. In the prior art, insulating materials are filled between the silicon steel sheets or an insulating layer is coated on the silicon steel sheets, and a conventional insulating layer is also provided on the surface of the iron core. The pre-pressed piece 3 in the middle of the iron core 1 plays a role when the primary coil 4 and the secondary coil 5 are tightly wound. When the coil is wound tightly, the iron core 1 is squeezed, so that the iron core 1 on both sides of the mounting cavity 2 will squeeze the pre-pressed piece 3. If the pre-pressed piece 3 is installed later, the size of the pre-pressed piece 3 itself needs to be slightly larger than the width of the mounting cavity 2. After being inserted into the mounting cavity 2, it will also be squeezed. The reaction force generated by the squeezing of the pre-pressed piece 3 will exert pressure on the silicon steel sheets on both sides, effectively reducing the gap between the silicon steel sheets. This can reduce the reflection and superposition of vibration energy generated by the gap between the silicon steel sheets under the alternating magnetic field, reduce magnetostrictive vibration, and thus reduce noise.

[0029] For example, without the pre-press 3, there may be a gap of 0.1-0.2mm between the silicon steel sheets, and the vibration amplitude under the action of the magnetic field is relatively large; after the pre-press 3 is applied, the gap can be reduced to within 0.05mm, the vibration amplitude can be reduced by 15%-20%, and the noise level is reduced accordingly.

[0030] The first elastic isolator 6 is located circumferentially around the secondary coil 5, with the primary coil 4 wound around it and pressed toward the core 1. The elastic isolator has excellent elasticity and cushioning properties, absorbing and isolating vibrations transmitted between the primary and secondary coils 4 and 5, as well as between the coils and the core 1. When the coils are energized and generate electromagnetic force, causing vibrations, the elastic isolator dissipates some of the vibration energy, reducing the transmission of vibrations to the core 1 and other components, thereby reducing noise. The elastic isolator can reduce the energy transmitted from the coil vibrations to the core 1 by 20%-30%, reducing noise by 5-8 decibels.

[0031] During the operation of the transformer, the coil and the core 1 may undergo relative displacement due to thermal expansion and contraction, generating friction noise. The first elastic isolation member 6 can provide a certain buffer space to reduce direct contact and friction between the coil and the core 1, thereby reducing the generation of friction noise.

[0032] like Figure 2 As shown, when the primary coil 4 is wound, the first elastic isolator 6 is squeezed, and the elastic force stored in the first elastic isolator 6 will act in the opposite direction on the secondary coil 5. The reverse elastic force will also act on the iron core 1 through the secondary coil 5, thereby further squeezing the silicon steel sheets and reducing the gap between the silicon steel sheets, further reducing the noise generated by magnetostrictive vibration.

[0033] The locking device locks the iron core 1 vertically, which can enhance the overall structural stability of the iron core 1. When the transformer is running, the iron core 1 will be affected by multiple forces such as electromagnetic force and thermal stress, which is prone to vibration. The locking device limits the vertical displacement of the iron core 1, reduces the vibration of the iron core 1 caused by the force, and thus reduces noise.

[0034] For example, without the locking device, the core 1 may have a vertical displacement of 0.5-1mm, generating large vibration noise; after installing the locking device, the displacement can be controlled within 0.1-0.2mm, and the noise level can be reduced by 8-12 decibels.

[0035] The synergistic effect of various components, including the preload element 3, the first elastic isolator 6, and the locking device, effectively reduces transformer operating noise by reducing gaps between silicon steel sheets, isolating vibration transmission, and enhancing the structural stability of the core 1. Compared to traditional three-phase dry-type transformers, this system reduces noise levels by 15-25 decibels, meeting the requirements of locations with high noise requirements, such as hospitals, schools, and distribution rooms near residential areas.

[0036] Furthermore, the iron core 1 is divided into a first iron core 101 and a second iron core 102. An installation cavity 2 is formed between the first iron core 101 and the second iron core 102. The pre-pressed part 3 is installed in the installation cavity 2. After the primary coil 4 and the secondary coil 5 are wound, the pre-pressed part 3 is in a state of being squeezed and deformed by the first iron core 101 and the second iron core 1.

[0037] Specifically, the iron core 1 is divided into a first iron core 101 and a second iron core 102, with an installation cavity 2 formed in the middle, providing a dedicated space for the installation of the pre-pressed part 3. This split design makes the installation process of the pre-pressed part 3 more convenient, and the position and initial state of the pre-pressed part 3 can be precisely adjusted according to actual needs. For example, during the installation process, if the position of the pre-pressed part 3 is found to be deviated, it can be easily fine-tuned to ensure that it can evenly apply pressure to the silicon steel sheet. Compared with the integral iron core 1, the split structure also facilitates the inspection and replacement of the pre-pressed part 3 during transformer maintenance and overhaul. If the pre-pressed part 3 is damaged or its performance degrades during use, it can be removed and replaced separately without the need for large-scale disassembly of the entire iron core 1, reducing maintenance costs and time.

[0038] The split core 1 structure increases the overall structural flexibility of the core 1 to a certain extent. During the operation of the transformer, the core 1 will be subjected to various forces, such as electromagnetic force, thermal stress, etc. The split structure can make the core 1 produce a certain amount of slight deformation when subjected to force, and reduce the vibration and noise caused by stress concentration through the buffering and adjustment effect of the pre-stressed part 3. For example, when the transformer load suddenly changes, the core 1 will be subjected to a large electromagnetic force impact. The split core 1 structure can cause a relatively small displacement between the first core 101 and the second core 102. The pre-stressed part 3 absorbs and dissipates this part of the energy through its own elastic deformation, thereby avoiding excessive vibration and noise from the core 1.

[0039] After the primary coil 4 and secondary coil 5 are wound, the preform 3 is squeezed and deformed by the first and second cores 101, 102. This squeeze and deformation allows the preform 3 to continuously apply pressure to the silicon steel sheets, effectively reducing the gaps between them. During transformer operation, magnetostriction causes the silicon steel sheets to periodically expand and contract. The continuous pressure of the preform 3 prevents the gaps between the sheets from increasing due to magnetostriction, maintaining a tight fit between the sheets.

[0040] During the extrusion deformation process, the pre-pressed part 3 will produce elastic deformation. This elastic deformation can provide a dynamic damping effect for the iron core 1. When the iron core 1 is subjected to vibration, the pre-pressed part 3 will absorb and dissipate the vibration energy through its own elastic deformation, reducing the transmission and amplification of the vibration. The pre-pressed part 3 can be compared to a spring shock absorber. When the iron core 1 vibrates, the pre-pressed part 3 is compressed and stretched like a spring, converting the vibration energy into its own elastic potential energy, which is then gradually released. In this process, most of the vibration energy is dissipated, and only a small amount of energy is transferred to the transformer casing, thereby reducing the generation of noise. Experiments have shown that the dynamic damping effect of the pre-pressed part 3 can increase the vibration energy dissipation efficiency of the iron core 1 by 30%-40%, and the noise level can be reduced by 10-15 decibels.

[0041] By reducing the gaps between the silicon steel sheets and dampening magnetostrictive vibration, the preform 3 reduces hysteresis and eddy current losses in the iron core 1, thereby improving transformer efficiency. This is because smaller gaps between the silicon steel sheets create a smoother magnetic circuit, lower magnetic resistance, and lower hysteresis losses. Reduced vibration also reduces eddy current losses. For example, under the same load conditions, a transformer using this split iron core 1 and preform 3 structure can improve efficiency by 1% to 2%, which can bring significant economic benefits to large transformers.

[0042] Reducing noise not only improves the transformer's operating environment but also enhances the stability and reliability of its internal structure. The presence of pre-load 3 reduces vibration and friction between the core 1 and the coil, reducing component wear and fatigue damage, and extending the transformer's service life. For example, during long-term operation, without the cushioning effect of pre-load 3, friction between the core 1 and the coil could damage the insulation material, leading to faults such as short circuits. Pre-load 3 reduces this friction, lowering the probability of faults and improving the transformer's reliability.

[0043] Furthermore, the pre-pressed part 3 is a corrugated stainless steel plate 301 , the cross section of the stainless steel plate 301 is wavy, the wave crest point 3011 of the stainless steel plate 301 acts on the inner wall of the first iron core 101 , and the wave trough point 3012 of the stainless steel plate 301 acts on the inner wall of the second iron core 102 .

[0044] Specifically, such as Figure 5 As shown, the corrugated stainless steel plate 301 is 304 stainless steel, which is pressed by a stamping machine. 304 stainless steel can prevent magnetic leakage. The stainless steel plate 301 is in direct contact with the iron core 1, which can quickly conduct and remove heat, thereby improving the heat dissipation effect of the iron core 1. The cross section of the corrugated stainless steel plate 301 is wavy, as shown in FIG. Figure 3 、 Figure 4 、 Figure 6 As shown, the distance between the wave crest point 3011 and the wave trough point 3012 is slightly larger than the width of the installation cavity 2. In this way, the stainless steel plate 301 will be pre-extruded after installation, with the wave crest point 3011 acting on the inner wall of the first iron core 101 and the wave trough point 3012 acting on the inner wall of the second iron core 102. This structural design enables the stainless steel plate 301 to achieve multi-point contact and uniform pressure with the inner walls of the first iron core 101 and the second iron core 102. Compared with the pre-pressed part 3 with a flat structure, the wavy structure can better adapt to the shape and surface unevenness of the inner wall of the iron core 1, ensuring a tight fit between the pre-pressed part 3 and the iron core 1, reducing local stress concentration and vibration noise caused by poor contact. For example, when there are tiny protrusions or depressions on the inner wall of the iron core 1, the wavy stainless steel plate 301 can use its own elastic deformation to make the wave crest or wave trough fit tightly with the inner wall of the iron core 1, ensuring uniform pressure distribution, thereby reducing vibration and noise caused by local uneven pressure.

[0045] The corrugated structure imparts a certain degree of elasticity to the stainless steel sheet 301. During transformer operation, the iron core 1 is subjected to various forces, including electromagnetic force and thermal stress, causing vibrations. The corrugated stainless steel sheet 301 buffers and absorbs this vibration energy through its elastic deformation, reducing the transmission and amplification of vibrations. At the same time, it is initially compressed, releasing the opposing force and narrowing the gaps between the silicon steel sheets.

[0046] When the iron core 1 vibrates, the wavy structure of the stainless steel plate 301 undergoes elastic compression and stretching, converting the vibration energy into its own elastic potential energy, which is then gradually released. In this process, most of the vibration energy is dissipated, and only a small amount is transferred to the transformer casing, thereby reducing noise generation.

[0047] Stainless steel materials have high strength and good stability, and can withstand large pressure and deformation without damage. During the operation of the transformer, the pre-pressed part 3 needs to continuously apply pressure to the iron core 1 to maintain a close fit between the silicon steel sheets. The high strength characteristics of the stainless steel plate 301 ensure that it will not undergo plastic deformation or breakage due to excessive pressure during long-term use, thereby ensuring the stability and reliability of the pre-pressed part 3. Transformers usually operate in various environments and may be affected by factors such as moisture, dust, and chemicals. Stainless steel materials have good corrosion resistance and can resist the erosion of these harsh environments, ensuring that the performance of the pre-pressed part 3 is not affected.

[0048] During installation, the stainless steel plate 301 only needs to be placed in the installation cavity 2 between the first core 101 and the second core 102, so that its peaks and troughs respectively contact the inner wall of the core 1. This eliminates the need for complex installation processes and tools, reducing installation costs and time.

[0049] Furthermore, two sides of the stainless steel plate 301 respectively form vertical first heat dissipation channels 16 with the inner wall of the first iron core 101 and the inner wall of the second iron core 102 .

[0050] Furthermore, a second heat dissipation channel 17 is formed between the secondary coil 5 and the primary coil 4. The first elastic isolation member 6 is inserted into the second heat dissipation channel 17 and separates the primary coil 4 and the secondary coil 5 to form the second heat dissipation channel 17. The first elastic isolation member 6 is an I-shaped rubber strip.

[0051] Furthermore, the primary coil 4 has multiple layers, each layer of primary coil 4 is wound by several turns of glass fiber wrapped wire, and a second elastic isolation member 20 is provided between two adjacent layers of primary coils 4. The second elastic isolation member 20 separates the two adjacent layers of primary coils 4 to form a third heat dissipation channel 18. The second elastic isolation member 20 is an I-shaped rubber strip.

[0052] Furthermore, the secondary coil 5 has multiple layers, and each layer of the secondary coil 5 is wound by several turns of glass fiber wrapped wire. A third elastic isolation member 9 is provided between two adjacent layers of the secondary coils 5. The third elastic isolation member 9 separates the two adjacent layers of the secondary coils 5 to form a fourth heat dissipation channel 19. The third elastic isolation member 9 is an I-shaped rubber strip.

[0053] Specifically, such as Figure 4As shown, the stainless steel plate 301 forms vertical first heat dissipation channels 16 between the inner walls of the first core 101 and the inner walls of the second core 102 on either side. The space between the preform 3 (stainless steel plate 301) and the core 1 creates a natural airflow path. During transformer operation, the core 1 generates heat, particularly in the center, where the temperature is highest. The first heat dissipation channels 16 allow air to flow freely from top to bottom, removing heat generated by the core 1 and effectively reducing its temperature. This effective heat dissipation also helps minimize material property changes and increased vibration caused by overheating of the core 1, thereby indirectly reducing noise. When the core 1 temperature is too high, the magnetostrictive properties of the silicon steel sheets may change, increasing vibration and noise. By lowering the core 1 temperature, the first heat dissipation channels 16 maintain the stable performance of the silicon steel sheets and reduce noise.

[0054] like Figure 2 As shown, a second heat dissipation channel 17 is formed between the secondary coil 5 and the primary coil 4. This channel is formed by inserting an I-shaped rubber strip (first elastic spacer 6) therein and separating them. The I-shaped rubber strip creates a gap between the coils, providing space for air circulation. When power is applied to the primary and secondary coils 4 and 5, heat is generated. This second heat dissipation channel 17 allows air to flow from top to bottom, removing heat. This helps to lower the coil temperature, reducing insulation material aging and resistance increase caused by coil overheating, thereby improving the transformer's operational stability and reliability. The I-shaped rubber strip not only separates the coils to form a heat dissipation channel but also provides electrical isolation, preventing short circuits between the primary and secondary coils 4 and 5. Furthermore, its excellent elasticity can buffer vibrations between the coils, reducing the noise generated by vibration.

[0055] An I-shaped rubber strip (second elastic spacer 20) is provided between two adjacent layers of primary coils 4 to separate the two adjacent layers of primary coils 4 to form a third heat dissipation channel 18. In the multi-layer primary coil 4 structure, sufficient space is ensured between each layer of coils for heat dissipation. The multi-layer primary coils 4 generate a large amount of heat during operation. The third heat dissipation channel 18 can effectively dissipate the heat and prevent heat accumulation inside the coils.

[0056] An I-shaped rubber strip (third elastic spacer 9) is installed between two adjacent layers of secondary coils 5, separating them to form a fourth heat dissipation channel 19. Similar to the third heat dissipation channel 18, this design provides space for heat dissipation from the secondary coil 5. The secondary coil 5 also generates heat during operation, and the fourth heat dissipation channel 19 helps reduce the temperature of the secondary coil 5 and ensure its stable performance.

[0057] The rubber strip is elastic and can buffer the vibration between the coil and the core 1. During the operation of the transformer, factors such as electromagnetic force and thermal stress can cause the coil and the core 1 to vibrate. The elastic isolator can absorb and dissipate the vibration energy, reduce the transmission and amplification of the vibration, and thus reduce the noise. For example, the elastic isolator can reduce the noise level of the transformer by 5-10 decibels, thereby improving the working environment of the transformer. During the operation of the transformer, due to factors such as temperature changes and load changes, the coil and the core 1 may expand and contract and deform. The elasticity of the I-shaped rubber strip can adapt to these deformations, maintain the relative position between the coil and the core 1 stable, reduce the stress and vibration caused by deformation, and improve the reliability and service life of the transformer.

[0058] In this embodiment, both the primary coil 4 and the secondary coil 5 use glass fiber covered wire with its own insulation layer. Compared with the copper tape winding used in the existing transformer, an insulating tape needs to be added between each layer of copper tape winding, which increases the manufacturing cost. At the same time, the production process is more complicated. In addition to winding the coil, the insulating tape also needs to be wound, which increases the labor intensity of the workers. The use of several turns of glass fiber covered wire can reduce and optimize the production process and reduce costs.

[0059] Furthermore, the locking device includes an L-shaped upper pressure plate 13 and a lower pressure plate 15. The upper pressure plate 13 is arranged on both sides of the upper end of the iron core 1, and the lower pressure plate 15 is arranged on both sides of the lower end of the iron core 1. Corresponding fixing seats 14 are provided on the sides of the upper pressure plate 13 and the lower pressure plate 15. The two fixing seats 14 at the upper and lower ends are fixed by bolts 7.

[0060] Furthermore, the bottom surface of the lower pressing plate 15 is connected to the first mounting seat 8 , and the ends of the upper pressing plate 13 and the lower pressing plate 15 are provided with a second mounting seat 12 . The first mounting seat 8 and the second mounting seat 12 are provided with waist-shaped mounting holes 11 .

[0061] Furthermore, a windshield 10 is provided below the upper pressure plate 13 and is located outside the primary coil 4 . The windshield 10 is an insulating plate. There is a gap between the windshield 10 and the primary coil 4 . The windshield 10 is connected to the bolt 7 .

[0062] Specifically, the locking device, the first mounting seat 8 , the second mounting seat 12 , the windshield 10 and the bolt 7 are all coated with an insulating layer.

[0063] like Figure 1As shown, the locking device is composed of an L-shaped upper pressure plate 13 and a lower pressure plate 15. The upper pressure plate 13 is arranged on both sides of the upper end of the iron core 1, and the lower pressure plate 15 is arranged on both sides of the lower end of the iron core 1. This symmetrical installation method can apply uniform pressure to the iron core 1 to ensure the stability of the iron core 1 during operation. An insulating plate can also be set between the pressure plate and the coil. Corresponding fixing seats 14 are provided on the sides of the upper pressure plate 13 and the lower pressure plate 15. The two fixing seats 14 at the upper and lower ends are fixed by bolts 7. The bolts 7 have threads only at both ends and the middle part is a plain rod. By tightening the bolts 7, the degree of pressure of the locking device on the iron core 1 can be adjusted. The bottom surface of the lower pressure plate 15 is connected to the first mounting seat 8. The ends of the upper pressure plate 13 and the lower pressure plate 15 are provided with a second mounting seat 12. The first mounting seat 8 and the second mounting seat 12 provide multiple connection points for the installation of the transformer.

[0064] Below the upper pressure plate 13, a windshield 10 is located outside the primary coil 4. This windshield 10 is located near the top of the transformer. It is an insulating plate with a gap between it and the primary coil 4. This allows more air to pass through the coil, improving heat dissipation. Windshield 10 is connected to bolts 7, which pass directly through windshield 10. To prevent windshield 10 from falling, a wedge can be inserted into the gap between windshield 10 and the outer wall of bolts 7 to prevent it from falling. Alternatively, it can be directly secured with adhesive.

[0065] like Figure 7 and Figure 8 As shown, based on the above embodiment, the pre-pressed part 3 can also be an I-shaped elastic strip 302, which is made of rubber or polyurethane, and is distributed at intervals in the installation cavity 2. The first heat dissipation channel 16 is formed between adjacent elastic strips 302, and the rest of the structure of the transformer is exactly the same.

[0066] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Based on the technical essence of the present invention and within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement of the above embodiment shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A low-noise three-phase dry-type transformer, comprising a transformer body, characterized in that: The transformer body comprises an iron core (1) composed of a plurality of silicon steel sheets, a secondary coil (5) wound on the iron core (1), a first elastic isolator (6) located in the circumferential direction of the secondary coil (5), and a primary coil (4) wound on the first elastic isolator (6) and pressing the first elastic isolator (6) toward the iron core (1). A mounting cavity (2) is provided in the middle of the iron core (1), and a pre-pressing member (3) is provided in the mounting cavity (2) for reducing the gap between the silicon steel sheets when the primary coil (4) and the secondary coil (5) are tightly wound. The transformer also comprises a locking device for locking the iron core (1) in the vertical direction.

2. A low-noise three-phase dry-type transformer according to claim 1, characterized in that: The iron core (1) is divided into a first iron core (101) and a second iron core (102); an installation cavity (2) is formed between the first iron core (101) and the second iron core (102); a pre-pressed component (3) is installed in the installation cavity (2); after the primary coil (4) and the secondary coil (5) are wound, the pre-pressed component (3) is in a state of being squeezed and deformed by the first iron core (101) and the second iron core (1).

3. A low-noise three-phase dry-type transformer according to claim 2, characterized in that: The pre-pressed part (3) is a corrugated stainless steel plate (301), the cross section of the stainless steel plate (301) is wavy, the wave crest point (3011) of the stainless steel plate (301) acts on the inner wall of the first iron core (101), and the wave trough point (3012) of the stainless steel plate (301) acts on the inner wall of the second iron core (102).

4. A low-noise three-phase dry-type transformer according to claim 3, characterized in that: The two sides of the stainless steel plate (301) respectively form a vertical first heat dissipation channel (16) with the inner wall of the first iron core (101) and the inner wall of the second iron core (102).

5. The low-noise three-phase dry-type transformer according to claim 1, characterized in that: A second heat dissipation channel (17) is formed between the secondary coil (5) and the primary coil (4), and a first elastic isolating member (6) is inserted into the second heat dissipation channel (17) and separates the primary coil (4) and the secondary coil (5) to form the second heat dissipation channel (17). The first elastic isolating member (6) is an I-shaped rubber strip.

6. A low-noise three-phase dry-type transformer according to claim 5, characterized in that: The primary coil (4) has multiple layers, each layer of the primary coil (4) is formed by winding a plurality of turns of glass fiber covered wire, a second elastic isolator (20) is provided between two adjacent layers of the primary coil (4), the second elastic isolator (20) separates the two adjacent layers of the primary coil (4) to form a third heat dissipation channel (18), and the second elastic isolator (20) is an I-shaped rubber strip.

7. The low-noise three-phase dry-type transformer according to claim 5, characterized in that: The secondary coil (5) has multiple layers, each layer of the secondary coil (5) is formed by winding a plurality of turns of glass fiber covered wire, a third elastic isolator (9) is provided between two adjacent layers of the secondary coils (5), the third elastic isolator (9) separates the two adjacent layers of the secondary coils (5) to form a fourth heat dissipation channel (19), and the third elastic isolator (9) is an I-shaped rubber strip.

8. The low-noise three-phase dry-type transformer according to claim 1, characterized in that: The locking device comprises an L-shaped upper pressing plate (13) and a lower pressing plate (15), wherein the upper pressing plate (13) is arranged on both sides of the upper end of the iron core (1), and the lower pressing plate (15) is arranged on both sides of the lower end of the iron core (1). Corresponding fixing seats (14) are provided on the sides of the upper pressing plate (13) and the lower pressing plate (15), and the two fixing seats (14) at the upper and lower ends are fixed by bolts (7).

9. The low-noise three-phase dry-type transformer according to claim 8, characterized in that: The bottom surface of the lower pressing plate (15) is connected to a first mounting seat (8), and the ends of the upper pressing plate (13) and the lower pressing plate (15) are provided with a second mounting seat (12). The first mounting seat (8) and the second mounting seat (12) are provided with waist-shaped mounting holes (11).

10. The low-noise three-phase dry-type transformer according to claim 8, characterized in that: A windshield (10) located outside the primary coil (4) is provided below the upper pressure plate (13). The windshield (10) is an insulating plate. A gap is provided between the windshield (10) and the primary coil (4). The windshield (10) is connected to the bolt (7).

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