Heat dissipation structure of high-power transformer

Abstract

The invention belongs to a heat dissipation structure of a high-power transformer in the technical field of high-power transformers. Comprising a left side plate (5), a right side plate (6) and a primary winding (3), the primary winding (3) is of a hollow structure, the primary winding (3) is of a structure made of metal materials, the left side plate (5) is connected with a liquid inlet pipe (9) through an insulating support (7), the liquid inlet pipe (9) is communicated with a water inlet of the primary winding (3), the right side plate (6) is connected with a liquid outlet pipe (10) through the insulating support (7), and the liquid outlet pipe (10) is communicated with a water outlet of the primary winding (3). The heat dissipation structure of the high-power transformer is simple in structure, liquid cooling of the primary winding is achieved on the premise that the size is not additionally increased, so that heat generated by iron loss and copper loss when the transformer works is better taken away, it is ensured that the working temperature of the transformer is maintained within a controllable temperature interval, equipment safety is guaranteed, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of high-power transformers, and more specifically, relates to a heat dissipation structure of a high-power transformer. Background Art

[0002] As the power density of power supply becomes larger and larger, under the premise that the volume of three-phase transformer remains unchanged, when the output power of transformer is increased or magnetic shielding protection of three-phase transformer components is required, the transformer components need to be placed in a closed metal shielding shell. When the three-phase transformer is working, the core loss and the copper loss of the winding will generate a lot of heat. The limited working space makes it impossible to discharge the internal heat, and heat accumulation will occur, which will have a great impact on the stability of the operation of the three-phase transformer. In severe cases, it will cause the burning of the three-phase transformer. In order to ensure that the working temperature rise of the three-phase transformer is controllable, it is necessary to heat and cool the three-phase transformer. In the prior art, the cooling method for dry-type three-phase transformers generally adopts air cooling or pre-buried heat pipes for heat exchange. These methods have limited heat dissipation efficiency and are not suitable for heat exchange in closed shells. They will cause the temperature in the shell to accumulate higher and higher, resulting in abnormal high temperature of the three-phase transformer or components. In summary, the disadvantages of the prior art are that the coil has poor heat dissipation and cannot efficiently transfer heat; pre-buried heat pipes inside the coil to improve the heat dissipation efficiency will increase the volume of the transformer and the heat conduction efficiency is not high.

[0003] In the prior art, there is a technology named "a low-voltage high-power transformer heat dissipation device" and the publication (announcement) number is "210722666U". This technology discloses a low-voltage high-power transformer heat dissipation device, including a shell, a partition is provided in the shell, the partition divides the inside of the shell into a closed device installation chamber and a heat dissipation chamber, a device installation board is provided in the device installation chamber, the device installation board is a heat conductive board, the device is installed on the device installation board, a heat pipe tightly fitted with the device installation board is installed under the device installation board, the heat pipe passes through the partition and extends into the heat dissipation chamber, and a heat dissipation fin is installed on the heat pipe located in the heat dissipation chamber, and the shell is provided with a mesh plate on the top, bottom and / or front and back of one side of the heat dissipation chamber. The device can be applied to the heat dissipation of low-voltage high-power transformers. The following problems are solved in collaboration: the temperature of the transformer coil and the circuit board can be controlled; the circuit board can be completely enclosed to prevent moisture, dust, etc. from entering, and there is no risk of electric shock; a natural convection cooling solution is adopted to avoid noise and other problems caused by the use of fans. However, this technology does not involve the technical solution of the present application. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the shortcomings of the prior art, a high-power transformer heat dissipation structure is provided, which has a simple structure and realizes liquid cooling of the primary winding without increasing the volume, so as to better remove the heat generated by the iron loss and copper loss when the transformer is working, ensure that the operating temperature of the transformer is maintained in a controllable temperature range, ensure the safety of the equipment, and increase the service life.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0006] The present invention discloses a heat dissipation structure for a high-power transformer, comprising a left side plate, a right side plate and a primary winding. The primary winding is a hollow structure and is made of a metal material. The left side plate is connected to a liquid inlet pipe through an insulating bracket, and the liquid inlet pipe is connected to a water inlet of the primary winding. The right side plate is connected to a liquid outlet pipe through an insulating bracket, and the liquid outlet pipe is connected to a water outlet of the primary winding.

[0007] The primary winding includes multiple liquid inlet pipes, and the liquid outlet pipes include multiple liquid inlet pipes. Each liquid inlet pipe is connected to a corresponding primary winding water inlet, and each liquid outlet pipe is connected to a corresponding primary winding water outlet.

[0008] The left side plate is provided with a left notch, each liquid inlet pipe is connected to a corresponding water inlet end of a primary winding and passes through a corresponding left notch, and the liquid inlet pipe and the left side plate are arranged in a non-direct contact structure.

[0009] The right side plate is provided with a right notch, each liquid outlet pipe is connected to a corresponding water outlet end of a primary winding and passes through a corresponding right notch, and the liquid outlet pipe and the right side plate are arranged in a non-direct contact structure.

[0010] The primary winding is a hollow structure made of copper material.

[0011] The high-power transformer heat dissipation structure also includes a plurality of secondary coils, and each secondary coil and a corresponding primary winding form a winding assembly.

[0012] The high-power transformer heat dissipation structure also includes iron yokes, one iron yoke is attached to the inner side of the left plate, and the other iron yoke is attached to the inner side of the right plate.

[0013] The liquid inlet pipe includes a water inlet main pipe and multiple water inlet branches. The water inlet main pipe is connected to multiple water inlet branches at the same time. Each water inlet branch is fixedly connected to the outer side of the left side plate through a corresponding insulating bracket. Each water inlet branch is connected to the water inlet end of a corresponding primary winding and passes through a corresponding left notch.

[0014] The liquid outlet pipe includes a water outlet main pipe and multiple water outlet branches. The water outlet main pipe is connected to multiple water outlet branches at the same time. Each water outlet branch is fixedly connected to the outer side of the right side plate through a corresponding insulating bracket. Each water outlet branch is connected to the water outlet end of a corresponding primary winding and passes through a corresponding right notch.

[0015] Each secondary coil of the high-power transformer heat dissipation structure and a primary winding with an iron core are encapsulated with epoxy to form a winding assembly.

[0016] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0017] The heat dissipation structure of the high-power transformer described in the present invention is improved during the structural setting. On the one hand, the heat dissipation structure is improved. The heat dissipation structure uses a hollow copper tube to make the primary winding of the transformer, making a transformer in the form of coolant heat dissipation. On the one hand, the primary winding can assume the function of a coil, and the primary winding is fixed to the terminal of the left plate with a wire. On the other hand, the primary winding can realize the heat dissipation function, and the heat dissipation and coil functions are combined into one, so as to meet the heat dissipation and coil functions. The volume of the primary winding will not increase, and no additional internal space of the structure will be occupied. When the transformer is working, low-temperature coolant is introduced into the primary winding through the liquid inlet pipe, and the coolant is discharged from the liquid outlet pipe after cooling, so as to realize the continuous supply of coolant, effectively improve the heat dissipation effect, and ensure the heat dissipation efficiency of the transformer. At the same time, in order to cut off the voltage of the input coil and prevent the voltage from being discharged along the cooling pipe (liquid inlet pipe and liquid outlet pipe) made of metal material, an insulating bracket is provided, and the left plate is connected to the liquid inlet pipe through the insulating bracket, and the right plate is connected to the liquid outlet pipe through the insulating bracket, so as to achieve an insulating state of non-direct contact between the cooling pipe and the side plate (left plate and right plate), thereby effectively preventing the voltage of the input coil from being discharged along the cooling pipe (liquid inlet pipe and liquid outlet pipe). BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following is a brief description of the contents and symbols in the drawings of this specification:

[0019] Figure 1 It is a structural schematic diagram of the heat dissipation structure of the high-power transformer according to the present invention;

[0020] Figure 2 It is a schematic diagram of the exploded structure of the high-power transformer heat dissipation structure of the present invention;

[0021] Figure 3 It is a side view structural schematic diagram of the high-power transformer heat dissipation structure of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the primary winding of the high-power transformer heat dissipation structure of the present invention;

[0023] The markings in the accompanying drawings are respectively: 1. stud bolt; 2. secondary coil; 3. primary winding; 4. iron yoke; 5. left side plate; 6. right side plate; 7. insulating bracket; 8. winding assembly; 9. liquid inlet pipe; 10. liquid outlet pipe; 11. left notch; 12. water inlet end head; 13. right notch; 14. water outlet end head; 15. water inlet main pipe; 16. water inlet branch pipe; 17. water outlet main pipe; 18. water outlet branch pipe. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0025] As attached Figure 1 -Attached Figure 4 As shown, the present invention is a heat dissipation structure of a high-power transformer, comprising a left side plate 5, a right side plate 6, and a primary winding 3. The primary winding 3 is a hollow structure, and the primary winding 3 is a structure made of metal material. The left side plate 5 is connected to the liquid inlet pipe 9 through the insulating bracket 7, and the liquid inlet pipe 9 is connected to the water inlet of the primary winding 3. The right side plate 6 is connected to the liquid outlet pipe 10 through the insulating bracket 7, and the liquid outlet pipe 10 is connected to the water outlet of the primary winding 3. The above structure proposes an improved technical solution to the deficiencies in the prior art. When the structure is set, on the one hand, the heat dissipation structure is improved, and the heat dissipation structure uses a hollow copper tube to make the primary winding 3 of the transformer, so as to make a transformer in the form of cooling liquid heat dissipation. On the one hand, the primary winding 3 can assume the function of the coil, and the primary winding 3 is fixed on the terminal of the left side plate 5 with a wire. On the other hand, the primary winding 3 can realize the heat dissipation function, realize the integration of heat dissipation and coil functions, and meet the heat dissipation and coil functions, while the volume of the primary winding 3 will not increase, and will not occupy additional internal space of the structure. When the transformer is working, a low-temperature coolant is introduced into the primary winding 8 through the liquid inlet pipe 9, and the coolant is discharged from the liquid outlet pipe 10 after cooling, so as to realize the continuous supply of coolant, effectively improve the heat dissipation effect, and ensure the heat dissipation efficiency of the transformer. At the same time, in order to cut off the voltage of the input coil and realize that the voltage is not derived with the cooling pipe (liquid inlet pipe and liquid outlet pipe) of the metal material, an insulating bracket 7 is set, the left side plate 5 is connected to the liquid inlet pipe 9 through the insulating bracket 7, and the right side plate 6 is connected to the liquid outlet pipe 10 through the insulating bracket 7, so as to realize the insulation state of non-direct contact between the cooling pipe and the side plate (left side plate 5 and right side plate 6), and effectively avoid the problem that the voltage of the input coil is derived with the cooling pipe (liquid inlet pipe 9 and liquid outlet pipe 10). The heat dissipation structure of the high-power transformer described in the present invention has a simple structure, and realizes the liquid cooling of the primary winding without adding extra volume, so as to better take away the heat generated by the iron loss and copper loss when the transformer is working, ensure that the operating temperature of the transformer is maintained in a controllable temperature range, ensure the safety of the equipment, and improve the service life.

[0026] The primary winding 3 includes multiple liquid inlet pipes 9, and the liquid outlet pipes 10 include multiple liquid inlet pipes 9, each of which is connected to a corresponding water inlet of the primary winding 3, and each of which is connected to a corresponding water outlet of the primary winding 3. In the above structure, the number of liquid inlet pipes 9 and liquid outlet pipes 10 corresponds to the number of primary windings, ensuring that each group of primary windings can be supplied with coolant, and the heat of the corresponding winding assembly 8 can be taken away, so as to reliably achieve the cooling function.

[0027] The left side plate 5 is provided with a left notch 11, each liquid inlet pipe 9 is connected to a corresponding water inlet end head 12 of a primary winding 3 and passes through a corresponding left notch 11, and the liquid inlet pipe 9 and the left side plate 5 are set to a non-direct contact structure. The right side plate 6 is provided with a right notch 13, each liquid outlet pipe 10 is connected to a corresponding water outlet end head 14 of a primary winding 3 and passes through a corresponding right notch 13, and the liquid outlet pipe 10 and the right side plate 6 are set to a non-direct contact structure. In the above structure, the cooling pipe and the side plate are non-contact insulation structures, which effectively blocks the voltage from being derived.

[0028] The primary winding 3 is a hollow structure made of copper material. In the above structure, the structure of the primary winding is improved, the size of the primary winding remains unchanged, and it has the functions of heat dissipation and coil.

[0029] The high-power transformer heat dissipation structure also includes a plurality of secondary coils 2, each secondary coil 2 and a corresponding primary winding 3 forming a winding assembly 8. Specifically, each secondary coil 2 and a primary winding 3 with an iron core are epoxy potted to form a winding assembly 8. The primary winding 3 with an iron core and the secondary coil 2 are combined into a primary-secondary assembly, which is potted with epoxy resin to form an integral structure. The heat generated by the winding assembly 8 during operation is taken away by the coolant passing through the primary winding 8 potted inside the coil assembly, effectively meeting the heat dissipation requirements.

[0030] In the structure of the present invention, the primary winding 3 is passed through the cooling liquid, and the primary winding (primary winding coil) and the secondary winding (secondary winding coil) are integrally potted and molded. By improving the primary winding 3, the heat dissipation problem of the transformer in a limited space or harsh environment is effectively solved, and the working stability and service life of the transformer are improved. Integrating the wire weight and heat dissipation functions of the primary winding can also reduce the volume of the transformer, and suppressing the temperature rise can increase the power of the transformer. The heat dissipation structure of the present invention is not limited to the use of three-phase transformers, but has extremely high versatility.

[0031] The high-power transformer heat dissipation structure further includes an iron yoke 4, one iron yoke 4 is attached to the inner side of the left plate 5, and the other iron yoke 4 is attached to the inner side of the right plate 6. In the above structure, the entire transformer is composed of multiple components. After the two iron yokes 4, the winding assembly 8 and the side plates are arranged in place, the left plate 5 and the right plate 6 are fixedly connected by stud bolts 1 to form a transformer structure.

[0032] The liquid inlet pipe 9 includes a water inlet main pipe 15 and a plurality of water inlet branch pipes 16. The water inlet main pipe 15 is connected to a plurality of water inlet branch pipes 16 at the same time. Each water inlet branch pipe 16 is fixedly connected to the outside of the left side plate 5 through a corresponding insulating bracket 7. Each water inlet branch pipe 16 is connected to the water inlet end head 12 of a corresponding primary winding 3 and passes through a corresponding left notch 11. The above structure can reliably realize water inflow to the hollow structures inside different primary windings 8 through a plurality of water inlet branch pipes 16. The water inlet end head 12 can reliably realize reliable connection with the water inlet end of the primary winding 8.

[0033] The liquid outlet pipe 9 includes a water outlet main pipe 17 and a plurality of water outlet branches 18. The water outlet main pipe 17 is connected to a plurality of water outlet branches 18 at the same time. Each water outlet branch 18 is fixedly connected to the outer side of the right side plate 6 through a corresponding insulating bracket 7. Each water outlet branch 18 is connected to a corresponding water outlet end head 14 of a primary winding 3 and passes through a corresponding right notch 13. The above structure can reliably realize the water outlet of the hollow structure inside different primary windings 8 through a plurality of water outlet branches 18. The water outlet end head 14 can reliably realize the reliable connection with the water outlet end of the primary winding 8.

[0034] The heat dissipation structure of the high-power transformer described in the present invention is improved during the structural setting. On the one hand, the heat dissipation structure is improved. The heat dissipation structure uses a hollow copper tube to make the primary winding 3 of the transformer, and makes a transformer in the form of coolant heat dissipation. On the one hand, the primary winding 3 can assume the function of a coil, and the primary winding 3 is fixed to the terminal of the left side plate 5 with a wire. On the other hand, the primary winding 3 can realize the heat dissipation function, and realize the combination of heat dissipation and coil functions, so as to meet the heat dissipation and coil functions, and the volume of the primary winding 3 will not increase, and will not occupy additional internal space of the structure. When the transformer is working, low-temperature coolant is introduced into the primary winding 8 through the liquid inlet pipe 9, and the coolant is discharged from the liquid outlet pipe 10 after cooling, so as to realize the continuous supply of coolant, effectively improve the heat dissipation effect, and ensure the heat dissipation efficiency of the transformer. At the same time, in order to cut off the voltage of the input coil and prevent the voltage from being discharged along the cooling pipe (liquid inlet pipe and liquid outlet pipe) made of metal material, an insulating bracket 7 is provided, and the left side plate 5 is connected to the liquid inlet pipe 9 through the insulating bracket 7, and the right side plate 6 is connected to the liquid outlet pipe 10 through the insulating bracket 7. When connected, the cooling pipe and the side plate (left side plate 5 and right side plate 6) are in an insulating state of non-direct contact, which effectively avoids the problem that the voltage of the input coil is discharged along the cooling pipe (liquid inlet pipe 9 and liquid outlet pipe 10).

[0035] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A high-power transformer heat dissipation structure, characterized in that: The invention comprises a left side plate (5), a right side plate (6), and a primary winding (3); the primary winding (3) is a hollow structure and is a structure made of a metal material; the left side plate (5) is connected to a liquid inlet pipe (9) through an insulating bracket (7); the liquid inlet pipe (9) is connected to a water inlet of the primary winding (3); the right side plate (6) is connected to a liquid outlet pipe (10) through an insulating bracket (7); the liquid outlet pipe (10) is connected to a water outlet of the primary winding (3).

2. The high-power transformer heat dissipation structure according to claim 1 is characterized in that: The primary winding (3) comprises a plurality of liquid inlet pipes (9), and the liquid outlet pipes (10) comprise a plurality of liquid inlet pipes (9). Each liquid inlet pipe (9) is connected to a corresponding water inlet of the primary winding (3), and each liquid outlet pipe (10) is connected to a corresponding water outlet of the primary winding (3).

3. The high-power transformer heat dissipation structure according to claim 2 is characterized in that: A left notch (11) is provided on the left side plate (5), and each liquid inlet pipe (9) is connected to a water inlet end portion (12) of a corresponding primary winding (3) and passes through a corresponding left notch (11), and the liquid inlet pipe (9) and the left side plate (5) are arranged in a non-direct contact structure.

4. The high-power transformer heat dissipation structure according to claim 2 or 3, characterized in that: A right notch (13) is provided on the right side plate (6); each liquid outlet pipe (10) is connected to a corresponding water outlet end (14) of a primary winding (3) and passes through a corresponding right notch (13); and the liquid outlet pipe (10) and the right side plate (6) are arranged in a non-direct contact structure.

5. The high-power transformer heat dissipation structure according to claim 1 or 2, characterized in that: The primary winding (3) is a hollow structure made of copper material.

6. The high-power transformer heat dissipation structure according to claim 1 or 2, characterized in that: The high-power transformer heat dissipation structure further comprises a plurality of secondary coils (2), each secondary coil (2) and a corresponding primary winding (3) forming a winding assembly (8).

7. The high-power transformer heat dissipation structure according to claim 6, characterized in that: The high-power transformer heat dissipation structure also includes an iron yoke (4), one iron yoke (4) is attached to the inner side of the left side plate (5), and the other iron yoke (4) is attached to the inner side of the right side plate (6).

8. The high-power transformer heat dissipation structure according to claim 1 or 2, characterized in that: The liquid inlet pipe (9) comprises a water inlet main pipe (15) and a plurality of water inlet branch pipes (16). The water inlet main pipe (15) is connected to the plurality of water inlet branch pipes (16) at the same time. Each water inlet branch pipe (16) is fixedly connected to the outer side of the left side plate (5) through a corresponding insulating bracket (7). Each water inlet branch pipe (16) is connected to the water inlet end portion (12) of a corresponding primary winding (3) and passes through a corresponding left notch portion (11).

9. The high-power transformer heat dissipation structure according to claim 1 or 2, characterized in that: The liquid outlet pipe (9) comprises a water outlet main pipe (17) and a plurality of water outlet branch pipes (18); the water outlet main pipe (17) is connected to the plurality of water outlet branch pipes (18) at the same time; each water outlet branch pipe (18) is fixedly connected to the outer side of the right side plate (6) via a corresponding insulating bracket (7); each water outlet branch pipe (18) is connected to the water outlet end portion (14) of a corresponding primary winding (3) and passes through a corresponding right notch portion (13).

10. The high-power transformer heat dissipation structure according to claim 6, characterized in that: Each secondary coil (2) of the high-power transformer heat dissipation structure and a primary winding (3) with an iron core are encapsulated with epoxy to form a winding assembly (8).

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