Dry-type power transformer

Abstract

The invention relates to the technical field of dry-type transformers, in particular to a dry-type power transformer. The dry-type power transformer comprises a base and clamping channel steel symmetrically installed at the top end of the base, an iron core shaped like a Chinese character'ri 'is installed on the clamping channel steel, and three sets of high-voltage windings and three sets of low-voltage windings are sequentially arranged on the iron core shaped like the Chinese character'ri'; the top beam frame is used for connecting a cable and is arranged at the top end of the iron core shaped like the Chinese character'ri '; the emptying framework is used for separating the three groups of high-voltage windings and the three groups of low-voltage windings in a one-to-one correspondence manner; the air cooling temperature control mechanism used for air supply and heat dissipation is installed on the base and comprises two air boxes, the number of the air boxes is two, the two air boxes are symmetrically installed on the base, air supply assemblies are installed in the air boxes, and drying assemblies are further installed in the air boxes. The dry-type power transformer provided by the invention has the advantages of excellent heat dissipation and ventilation.

Description

Technical Field

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

[0002] Dry-type power transformer is a transformer that does not use liquid cooling medium, but mainly relies on air or other gases for cooling. Due to its environmental protection, safety, and easy maintenance, it is widely used in construction, industry, transportation and other fields. Its main features are oil-free design without insulating oil, avoiding oil leakage and fire risks, environmental protection: no oil, reducing environmental pollution; easy maintenance: simple structure, low maintenance cost; flexible installation: small size, light weight, suitable for a variety of installation environments; good fire resistance: flame retardant materials are used, excellent fire resistance.

[0003] However, when the existing dry-type transformer is in use, its cooling system mainly adopts natural wind or forced air supply for air cooling. Its heat dissipation efficiency is not only affected by air cooling, but also by the gap between the high-voltage winding and the low-voltage winding. When the traditional dry-type transformer is used for a long time, the high-voltage winding sleeved on the outside of the low-voltage winding is easy to adhere to the low-voltage winding, thereby affecting the heat dissipation of the dry-type transformer. High-temperature sintering is easy to occur at the bonding point, causing the enameled wires of the high-voltage winding and the low-voltage winding to be exposed, affecting the normal operation of the transformer.

[0004] Therefore, it is necessary to provide a new dry-type power transformer to solve the above-mentioned technical problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a dry-type power transformer.

[0006] The dry-type power transformer provided by the present invention comprises: a base, and a clamping channel steel symmetrically installed on the top of the base, a Japanese-shaped iron core is installed on the clamping channel steel, and three groups of high-voltage windings and three groups of low-voltage windings are sequentially arranged on the Japanese-shaped iron core; A top beam frame, for connecting cables, is installed on the top of the Japanese-shaped iron core; A hollowing frame, used to separate the three groups of high-voltage windings and the three groups of low-voltage windings in a one-to-one correspondence; An air-cooled temperature control mechanism for supplying air for heat dissipation is installed on the base, and the air-cooled temperature control mechanism includes an air box, two of which are symmetrically installed on the base, and an air supply component is installed in the air box, and a drying component is also installed in the air box.

[0007] Preferably, the hollowing skeleton includes a bottom ring, which is movably mounted on the Japanese-shaped iron core, and a plurality of hollow insulating rods are evenly mounted on the bottom ring, and symmetrically distributed partitions are integrally formed on both sides of the plurality of hollow insulating rods.

[0008] Preferably, a plurality of ventilation holes are evenly arranged on the hollow insulating rod heat exchange partition, and a pressing piece for fixing the high-voltage winding and the low-voltage winding is installed at the top end of the hollow insulating rod.

[0009] Preferably, the compression piece comprises a transfer screw, which is threadedly mounted on the top end of the hollow insulating rod, and a pressure cover plate is threadedly mounted on the outer wall of the transfer screw, and an upper push rod is threadedly mounted on the top end of the transfer screw.

[0010] Preferably, the air supply assembly includes a transmission rod, which is rotatably mounted on the wind box, a power motor for driving the transmission rod to rotate is mounted on one side of the wind box, a thermostat is embedded on the outer side of the wind box, the thermostat is electrically connected to the power motor, a plurality of wind blades are fixedly sleeved on one end of the transmission rod extending into the wind box, and the transmission rod cooperates with the drying assembly in transmission.

[0011] Preferably, a ventilation grille is provided at the air inlet end of the air box, and an air outlet end of the air box is tilted upward and toward one side of the Japanese-shaped iron core.

[0012] Preferably, the drying component includes a drying box, which is installed in the wind box and located at the air inlet end of the wind box, and is filled with desiccant, and protective nets are embedded on both sides of the drying box, and a plurality of driving rods are evenly installed in the drying box, and a plurality of stirring rods are installed at one end of the driving rods extending into the drying box, and a plurality of driving rods extend out of the drying box at one end and pass through the wind box and are connected by transmission gears, and one of the driving rods cooperates with the transmission rod through a pulley.

[0013] Preferably, the mesh size of the protective net is smaller than the diameter of the desiccant particles.

[0014] Preferably, a soundproof cover is installed on the top beam frame, and the soundproof cover wraps the clamping channel steel, the Japanese-shaped iron core, the high-voltage winding and the three groups of low-voltage windings.

[0015] Preferably, glass magnesium plates are attached to both the inner and outer sides of the soundproof cover, and a plurality of sound-absorbing holes are evenly opened on the glass magnesium plates and the soundproof cover.

[0016] Compared with the related art, the dry-type power transformer provided by the present invention has the following beneficial effects: 1. The present invention provides a dry-type power transformer, which is provided with an emptying frame between the high-voltage winding and the low-voltage winding. The emptying frame is convenient for ensuring the ventilation gap between the high-voltage winding and the low-voltage winding by using the cooperation of the bottom ring, the hollow insulating rod, the partition, the ventilation hole, the pressing piece, the switching screw, the gland plate and the upper push rod, so as to maintain stable heat dissipation. The pressing piece is provided to facilitate the rapid installation of the high-voltage winding and the low-voltage winding on the Japanese-shaped iron core. 2. By setting up an air-cooled temperature control mechanism on the base and utilizing the air supply components and drying components in the air boxes on both sides of the base, when natural ventilation cannot meet the heat dissipation requirements of the transformer under high load operation, the air supply components can be started to provide strong air supply and heat dissipation to improve the heat dissipation so that the transformer can operate stably under high load. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a preferred embodiment of a dry-type power transformer provided by the present invention; Figure 2 A structural schematic diagram of the dry-type power transformer provided by the present invention from another perspective; Figure 3 A schematic diagram of the structure of a dry-type power transformer provided by the present invention, in which a hollow frame is inserted between a high-voltage winding and a low-voltage winding; Figure 4 A schematic structural diagram of an empty frame of a dry-type power transformer provided by the present invention; Figure 5 A schematic diagram of a partial cross-sectional structure of an air box of a dry-type power transformer provided by the present invention; Figure 6 A schematic structural diagram of an air supply assembly for a dry-type power transformer provided by the present invention; Figure 7 A schematic cross-sectional structure diagram of a drying box for a dry-type power transformer provided by the present invention; Figure 8 for Figure 4 A partial enlarged view of A shown; Fig. 9 A structural schematic diagram of a dry-type power transformer provided by the present invention equipped with a sound insulation cover.

[0018] Numbers in the figure: 1. Base; 2. Japanese-shaped iron core; 3. High-voltage winding; 4. Low-voltage winding; 5. Top beam frame; 6. Emptying frame; 7. Air-cooled temperature control mechanism; 8. Wind box; 9. Air supply assembly; 10. Drying assembly; 11. Sound insulation cover; 12. Bottom ring; 13. Hollow insulating rod; 14. Partition; 15. Ventilation hole; 16. Pressing piece; 17. Adapter screw; 18. Covering plate; 19. Upper push rod; 20. Transmission rod; 21. Power motor; 22. Temperature controller; 23. Wind blades; 24. Drying box; 25. Protective net; 26. Drive rod; 27. Stirring rod; 28. Clamping channel steel. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figure 1-Figure 8 The present invention implements a dry-type power transformer, which includes: a base 1, and a clamping channel steel 28 symmetrically installed on the top of the base 1, a Japanese-shaped iron core 2 is installed on the clamping channel steel 28, and three groups of high-voltage windings 3 and three groups of low-voltage windings 4 are sequentially arranged on the Japanese-shaped iron core 2; a top beam frame 5, and the top beam frame 5 for connecting cables is installed on the top of the Japanese-shaped iron core 2.

[0021] A hollowing frame 6, which is used to separate the three groups of high-voltage windings 3 and the three groups of low-voltage windings 4 in a one-to-one correspondence; An air-cooled temperature control mechanism 7 for supplying air for heat dissipation is installed on the base 1, and the air-cooled temperature control mechanism 7 includes an air box 8, two of which are symmetrically installed on the base 1, and an air supply component 9 is installed in the air box 8, and a drying component 10 is also installed in the air box 8.

[0022] In this solution, a hollowing frame 6 is provided between the high-voltage winding 3 and the low-voltage winding 4, and the hollowing frame 6 is used to separate the high-voltage winding 3 and the low-voltage winding 4 to maintain good ventilation, thereby avoiding contact and bonding, causing sticky sintering, so as to protect them and avoid sintering damage to the enameled wire of the winding, so that the high-voltage winding 3 and the low-voltage winding 4 can each maintain a stable operating state. Furthermore, in order to make the transformer work efficiently, the air-cooled temperature control mechanism 7 can be used to control the temperature of the running transformer.

[0023] It is worth noting that natural ventilation is preferred for heat dissipation. When the transformer is under high load and the temperature rises too fast, the air-cooled temperature control mechanism 7 intervenes to force cold air to the transformer to accelerate heat dissipation and cooling.

[0024] In the embodiments of the present invention, please refer to Figure 1 , Figure 3 , Figure 4 and Figure 8 The hollowing frame 6 includes a bottom ring 12, which is movably mounted on the Japanese-shaped core 2, and a plurality of hollow insulating rods 13 are evenly mounted on the bottom ring 12, and a plurality of hollow insulating rods 13 are integrally formed with symmetrically distributed partitions 14 on both sides thereof; A plurality of ventilation holes 15 are evenly provided on the heat exchange baffle 14 of the hollow insulating rod 13 , and a pressing piece 16 for fixing the high-voltage winding 3 and the low-voltage winding 4 is installed at the top end of the hollow insulating rod 13 .

[0025] It should be noted that the hollow frame 6 is placed on the Japanese-shaped iron core 2 using the bottom ring 12, and a separation space is formed by a number of hollow insulating rods 13 and partitions 14 as a ventilation channel, thereby strongly separating the high-voltage winding 3 and the low-voltage winding 4, ensuring that stable ventilation and heat dissipation can be maintained to avoid sticking and sintering.

[0026] Furthermore, in order to facilitate the installation and fixation of the high-voltage winding 3 and the low-voltage winding 4, in the present embodiment, the pressing piece 16 includes a transfer screw 17, which is threadedly installed on the top of the hollow insulating rod 13, and the outer wall of the transfer screw 17 is threadedly installed with a pressure cover plate 18, and the top of the transfer screw 17 is threadedly installed with an upper push rod 19. In this way, after the high-voltage winding 3 and the low-voltage winding 4 are separated on the Japanese-shaped iron core 2 by using the emptying skeleton 6, the transfer screw 17 is first screwed into the hollow insulating rod 13 at an appropriate position, and then the pressure cover plate 18 is screwed to press the separated high-voltage winding 3 and low-voltage winding 4 onto the bottom ring 12, and then the upper push rod 19 is screwed to press the entire emptying skeleton 6, the high-voltage winding 3 and the low-voltage winding 4 onto the Japanese-shaped iron core 2.

[0027] It is worth noting that the suitable position here refers to the position directly below the edge of the top beam frame 5. When the upper push rod 19 is screwed and moved upward along the adapter screw 17 until the upper push rod 19 contacts the top beam frame 5, the high-voltage winding 3 and the low-voltage winding 4 can be pressed and fixed on the Japanese-shaped iron core 2 by continuing to screw the matching pressure cover plate 18. The components arranged between the high-voltage winding 3 and the low-voltage winding 4 are made of insulating materials to avoid conductivity and ensure the normal step-up and step-down of the transformer.

[0028] In the embodiments of the present invention, please refer to Figure 1 , Figure 2 , Figure 5 , Figure 6, and Figure 7 , the air supply assembly 9 includes a transmission rod 20 which is rotatably installed on the air box 8. A power motor 21 for driving the transmission rod 20 to rotate is installed on one side of the air box 8. A thermostat 22 is embedded on the outer side of the air box 8, and the thermostat 22 is electrically connected to the power motor 21. A plurality of wind blades 23 are fixedly sleeved at one end of the transmission rod 20 extending into the air box 8, and the transmission rod 20 is in transmission cooperation with the drying assembly 10; It should be noted that when the thermostat 22 detects that the temperature of the transformer is too high and the natural ventilation and heat dissipation effect is general, the power motor 21 can be controlled to drive the transmission rod 20 to rotate, thereby driving a plurality of wind blades 23 to rotate for forced air supply. During the air supply process, the drying assembly 10 is used to dry the conveyed air to prevent humid air from blowing into the transformer and causing damage to the transformer; Further, in order to enable the drying assembly 10 to fully dry the conveyed air, the drying assembly 10 includes a drying box 24 which is installed in the air box 8 and is located at the air inlet end of the air box 8. The drying box 24 is filled with a desiccant, and protective nets 25 are embedded on both sides of the drying box 24. A plurality of driving rods 26 are evenly installed in the drying box 24. One end of a plurality of the driving rods 26 extending into the drying box 24 is provided with a plurality of stirring rods 27. One end of a plurality of the driving rods 26 extending out of the drying box 24 passes through the air box 8 and is in transmission connection through transmission gears, and one of the driving rods 26 is in transmission cooperation with the transmission rod 20 through a belt pulley. Thus, when the transmission rod 20 rotates, a plurality of driving rods 26 are driven to rotate synchronously by the belt pulley and the transmission gears. When the driving rods 26 rotate, the stirring rods 27 are used to stir the desiccant in the drying box 24, increasing the contact area between the desiccant and the flowing air, and further fully drying it; Wherein, the mesh aperture of the protective net 25 is smaller than the diameter of the desiccant particles, so as to prevent the desiccant from overflowing from the drying box 24 during stirring.

[0029] It is worth noting that: a ventilation grid is provided at the air inlet end of the air box 8, and the air outlet end of the air box 8 is inclined upward and faces the side of the E-shaped iron core 2. Thus, when the air supply assembly 9 in the air box 8 supplies air, it directly blows from the air outlet end to the E-shaped iron core 2, reducing the distance of air transmission, performing forced air supply, and improving heat dissipation.

[0030] Embodiment Two: On the basis of Embodiment One, please refer to Figure 1 - Fig. 9 , a sound insulation cover 11 is installed on the top beam frame 5, and the sound insulation cover 11 wraps the clamping channel steel 28, the E-shaped iron core 2, the high-voltage winding 3 and the three groups of low-voltage windings 4; Furthermore, glass magnesium plates are attached to both the inner and outer sides of the soundproof cover 11 , and a plurality of sound-absorbing holes are evenly formed on the glass magnesium plates and the soundproof cover 11 .

[0031] It should be noted that: when the transformer is working, the glass magnesium plate with silencer holes is used in combination with the sound insulation cover 11 to reduce noise propagation and avoid more noise pollution when the transformer is working.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dry-type power transformer, comprising: A base (1), and a clamping channel steel (28) symmetrically mounted on the top of the base (1), a Japanese-shaped iron core (2) being mounted on the clamping channel steel (28), and three groups of high-voltage windings (3) and three groups of low-voltage windings (4) being sequentially mounted on the Japanese-shaped iron core (2); A top beam frame (5), the top beam frame (5) being used for connecting cables and being installed on the top end of the Japanese-shaped iron core (2); It is characterized by further comprising: A hollowing frame (6), used for separating the three groups of high-voltage windings (3) and the three groups of low-voltage windings (4) in a one-to-one correspondence; An air-cooling temperature control mechanism (7), the air-cooling temperature control mechanism (7) for supplying air for heat dissipation is installed on the base (1), and the air-cooling temperature control mechanism (7) comprises an air box (8), two air boxes (8) are provided, the two air boxes (8) are symmetrically installed on the base (1), an air supply component (9) is installed in the air box (8), and a drying component (10) is also installed in the air box (8).

2. The dry-type power transformer according to claim 1, characterized in that: The hollowing frame (6) comprises a bottom ring (12), the bottom ring (12) being movably sleeved on the Japanese-shaped iron core (2), and a plurality of hollow insulating rods (13) being evenly mounted on the bottom ring (12), and symmetrically distributed partitions (14) being integrally formed on both sides of the plurality of hollow insulating rods (13).

3. The dry-type power transformer according to claim 2, characterized in that: A plurality of ventilation holes (15) are evenly arranged on the heat exchange baffle (14) of the hollow insulating rod (13), and a pressing piece (16) for fixing the high-voltage winding (3) and the low-voltage winding (4) is installed at the top end of the hollow insulating rod (13).

4. The dry-type power transformer according to claim 3, characterized in that: The compression piece (16) comprises a transition screw (17), the transition screw (17) being threadedly mounted on the top end of the hollow insulating rod (13), a pressure cover plate (18) being threadedly mounted on the outer wall of the transition screw (17), and an upper push rod (19) being threadedly mounted on the top end of the transition screw (17).

5. The dry-type power transformer according to claim 1, characterized in that: The air supply component (9) comprises a transmission rod (20), the transmission rod (20) being rotatably mounted on the wind box (8), a power motor (21) for driving the transmission rod (20) to rotate being mounted on one side of the wind box (8), a temperature controller (22) being embedded on the outer side of the wind box (8), the temperature controller (22) being electrically connected to the power motor (21), a plurality of wind blades (23) being fixedly sleeved on one end of the transmission rod (20) extending into the wind box (8), and the transmission rod (20) being in transmission cooperation with the drying component (10).

6. The dry-type power transformer according to claim 5, characterized in that: The air inlet end of the wind box (8) is provided with a ventilation grille, and the air outlet end of the wind box (8) is tilted upward and faces one side of the Japanese-shaped iron core (2).

7. The dry-type power transformer according to claim 5, characterized in that: The drying assembly (10) comprises a drying box (24), the drying box (24) being installed in the wind box (8) and located at the air inlet end of the wind box (8), the drying box (24) being filled with desiccant, and protective nets (25) being embedded on both sides of the drying box (24), a plurality of driving rods (26) being evenly installed in the drying box (24), a plurality of stirring rods (27) being installed at one end of the plurality of driving rods (26) extending into the drying box (24), a plurality of driving rods (26) extending out of the drying box (24) passing through the wind box (8) and being connected by transmission gears, and one of the driving rods (26) being transmission-coordinated with the transmission rod (20) via a pulley.

8. The dry-type power transformer according to claim 7, characterized in that: The mesh size of the protection net (25) is smaller than the diameter of the desiccant particles.

9. The dry-type power transformer according to claim 1, characterized in that: A soundproof cover (11) is installed on the top beam frame (5), and the soundproof cover (11) encloses the clamping channel steel (28), the Japanese-shaped iron core (2), the high-voltage winding (3) and the three groups of low-voltage windings (4).

10. The dry-type power transformer according to claim 9, characterized in that: Glass magnesium plates are adhered to both the inner and outer sides of the soundproof cover (11), and a plurality of sound-absorbing holes are evenly provided on the glass magnesium plates and the soundproof cover (11).

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