Air guide and heat dissipation system for epoxy pouring transformer

Abstract

The invention discloses an air guide and heat dissipation system for an epoxy pouring transformer. The air guide and heat dissipation system comprises an air guide channel, a cooling fan and a channel supporting frame. The air guide channel is arranged in the transformer box body, is positioned between a hot air outlet at the top of the coil and an air outlet at the upper part of the transformer box body and is used for guiding hot air generated by the transformer body to the air outlet; the channel supporting frame is arranged on the upper portion of the transformer body and used for supporting the air guiding channel and providing a displacement adjusting function. An air inlet is formed in the lower part of the transformer box body and is positioned at the bottom of the coil; the cooling fan is arranged on the outer side of the upper portion of the transformer box, communicated with an air outlet in the upper portion of the transformer box and used for pumping out hot air flow in the transformer box. The novel air guide and heat dissipation system is designed, a specific air guide channel capable of covering the heating area of the transformer body is formed, the centralized guidance quality of the air volume is enhanced, the negative pressure exhaust principle is matched, the effective utilization rate and balance of the air volume are improved, and the heat dissipation effect of the epoxy pouring transformer is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of epoxy cast transformers, and in particular to an air guide and heat dissipation system for epoxy cast transformers. Background Art

[0002] Epoxy-cast transformers offer advantages such as compact structure, environmental friendliness, strong environmental resistance, and high stability and reliability. They meet the power industry's demand for low energy efficiency and environmental protection and have been widely used in various fields, including energy, shipping, and power distribution. With increasing demands for overload capacity, operational stability, and service life, temperature rise has become a key research metric for epoxy-cast transformers. In the energy storage sector, in particular, epoxy-cast transformers are often housed in integrated enclosures with an IP54 protection rating. Due to the enclosure's tight sealing and complex internal structure, air convection paths can be disrupted, airflow can be obstructed, and heat dissipation efficiency can be low. This can further increase the transformer's temperature during high summer temperatures. Excessive temperature rise during operation of epoxy-cast dry-type transformers can cause resin cracking, accelerate insulation aging, reduce the insulation's withstand voltage, and lead to insulation breakdown, ultimately impacting the transformer's reliable operation and service life.

[0003] Currently, epoxy-cast dry-type transformers commonly use natural convection and forced air cooling. Forced air cooling involves installing a cooling fan at the bottom of the transformer's coil channel. This fan forcibly directs the cooling air upward, allowing the hot air to escape from above. However, without a directional and centralized heat dissipation channel, the airflow cannot be fully concentrated through the transformer. Furthermore, airflow distribution depends on the fan's position and blowing angle, resulting in uneven heat dissipation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an air guide and heat dissipation system for epoxy cast dry-type transformers with a compact structure, significant heat dissipation effect and high stability, in order to address the phenomenon of excessive temperature rise and resin cracking caused by poor heat dissipation performance and uneven heat dissipation in existing epoxy cast dry-type transformers.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A wind guide and heat dissipation system for an epoxy cast transformer comprises an air guide channel, a cooling fan and a channel support frame; the air guide channel is arranged inside the transformer box and is located between the hot air flow outlet on the top of the coil and the exhaust port on the upper part of the transformer box, so as to guide the hot air generated by the transformer body to the exhaust port; the channel support frame is arranged on the upper part of the transformer body to support the air guide channel and adjust the installation position of the air guide channel in the transformer box; an air inlet is provided at the lower part of the transformer box, and the air inlet is located at the bottom of the coil; the cooling fan is arranged on the outer side of the upper part of the transformer box and is connected to the exhaust port on the upper part of the transformer box, and an air outlet is provided on the side of the cooling fan to extract the hot air flow inside the transformer box to achieve heat dissipation of the transformer.

[0006] As a further improvement of the present invention, the channel support frame includes a support member and an adjusting member, the support member is respectively connected to the adjusting member and the air guide channel, and the adjusting member is connected to the upper part of the transformer body; the adjusting member is used to adjust the height position of the support member, thereby adjusting the height position of the air guide channel in the transformer box.

[0007] As a further improvement of the present invention, a positioning block is provided at the bottom of the air guide channel, and the positioning block is used to assist in positioning the air guide channel on the top of the coil.

[0008] As a further improvement of the present invention, a sealing strip is provided on the top of the air guide channel, and the sealing strip is used to achieve a sealed connection between the air guide channel and the transformer box.

[0009] As a further improvement of the present invention, a filter is provided on the top of the air guide channel to prevent foreign matter from falling into the transformer body.

[0010] As a further improvement of the present invention, the air guide channel is enclosed by a high-temperature resistant insulating board.

[0011] As a further improvement of the present invention, the cooling fan is a centrifugal fan, an axial flow fan or a mixed flow fan.

[0012] As a further improvement of the present invention, a mounting rack is provided on the outer side of the top of the transformer box, the cooling fan is installed on the mounting rack, and multiple cooling fans are evenly distributed within the radiation range of the air guide channel to achieve balanced airflow distribution.

[0013] As a further improvement of the present invention, the adjusting member is a threaded sliding rod, a modular pad, an elastic deformable body, a telescopic sleeve, or a wedge block.

[0014] As a further improvement of the present invention, the support member is made of steel or alloy material.

[0015] Compared with the prior art, the advantages of the present invention are: The air guide and heat dissipation system for epoxy cast transformers of the present invention constructs a specific air guide channel to connect the heating area of ​​the transformer body to the exhaust port, concentrates the air volume and effectively utilizes it for heat dissipation of the transformer body and eliminates the interference of other structural parts in the transformer box with the air flow; at the same time, a cooling fan is arranged at the exhaust port on the top of the transformer, and a negative pressure is generated in the heat dissipation area by forced exhaust to guide the external cold air at the bottom of the transformer to be sucked into the transformer. The hot air flow formed after flowing through the transformer air duct is discharged from the box through the preset air guide channel on the top. The dependence of the heat dissipation effect on the position of the fan and the blowing angle is avoided. The present invention aims to optimize and specify the air flow path of the cooling system, form a stable and uniform air flow distribution, avoid local eddies, increase the effective utilization rate of the air volume, and thus greatly improve the heat dissipation effect. It effectively solves the problems of uneven heat dissipation and low heat dissipation efficiency under traditional heat dissipation methods in the industry, reduces the probability of excessive local temperature rise during the operation of the transformer, thereby ensuring the long-term stable operation of the transformer and increasing its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structural principle of an air guide and heat dissipation system for an epoxy cast transformer in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the connection structure principle between the air guide channel and the support member in a specific embodiment of the present invention; Legend: 1. Air guide channel; 2. Air inlet; 3. Air outlet; 4. Cooling fan; 5. Mounting bracket; 6. Support member; 7. Adjustment member; 8. Filter; 9. Positioning block; 10. Sealing strip; 100. Transformer box; 101. Coil; 102. Transformer body. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.

[0018] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0020] Example like Figure 1 As shown, the air guide and heat dissipation system for epoxy cast transformers of the present invention includes an air guide channel 1, a cooling fan 4 and a channel support frame. The air guide channel 1 is arranged inside the transformer box 100 and is located between the hot air flow outlet at the top of the coil 101 and the exhaust port on the upper part of the transformer box 100, so as to guide the hot air generated by the transformer body 102 to the exhaust port. The channel support frame is arranged on the upper part of the transformer body 102 to support the air guide channel 1 and adjust the installation position of the air guide channel 1 in the transformer box 100. An air inlet 2 is provided at the lower part of the transformer box 100, and the air inlet 2 is located at the bottom of the coil 101, so that the external cold air flows through the entire coil 101 when entering the transformer. The cooling fan 4 is arranged on the outer side of the upper part of the transformer box 100 and is connected to the exhaust port on the upper part of the transformer box 100. An air outlet 3 is provided on the side of the cooling fan 4 to extract the hot air flow inside the transformer box 100 to achieve transformer heat dissipation. It can be understood that the structural settings of the coil 101 and the transformer body 102 adopt conventional settings in the field, and will not be described here in detail.

[0021] In this embodiment, a new type of air guide and heat dissipation system is designed to form a specific air guide channel 1 that can cover the heating area of ​​the transformer body, optimize and specify the air flow path of the cooling system, eliminate the interference resistance of other structural parts in the box to the air flow, form a stable and uniform air flow distribution, avoid local eddies, enhance the centralized guidance of the air volume, and cooperate with the negative pressure exhaust principle to improve the effective utilization rate and balance of the air volume, significantly improve the heat dissipation effect of the epoxy cast transformer, and at the same time reduce the amount of conductor material used.

[0022] In this embodiment, the air guide channel 1 is enclosed by a high-temperature resistant insulating board, such as an SMC board, a PC board, a DMC board, an epoxy 3240 board, a BMC board, or a GPO-3 board. The thickness of the board can be selected as 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, or 10 mm according to the actual stress conditions. The coverage and shape of the air guide channel 1 can be changed according to the structure of the transformer box 100 and the internal structure of the box.

[0023] In this embodiment, the cooling fan 4 can be a centrifugal fan, and the number of fans is determined according to the transformer body loss, the air volume of a single fan, and the wind pressure in the transformer box 100. When the cooling fan 4 is running, forced exhaust is used to generate a negative pressure in the channel inside the transformer box 100 to guide the external cold air at the bottom to be sucked into the box. After flowing through the transformer air duct, a hot air flow is formed, and then under the action of negative pressure, it quickly flows upward through the preset air guide channel 1 and is finally discharged from the box. The air guide and heat dissipation system of this embodiment eliminates the fan at the bottom of the transformer and adopts the negative pressure principle for air circulation and heat dissipation. The size and distribution of the air volume are no longer constrained by the fan angle and fan position, avoiding the dependence of the heat dissipation effect on the fan position and blowing angle, and improving the adjustment efficiency during the product manufacturing process. In other embodiments, the cooling fan 4 can also be an axial flow fan or a mixed flow fan. As long as it can achieve negative pressure in the air guide channel 1, the hot air flow generated by the transformer body 102 is extracted to achieve transformer heat dissipation.

[0024] like Figure 2 As shown, the channel support frame includes a support member 6 and an adjustment member 7. The two ends of the support member 6 are respectively connected to the two side walls of the air guide channel 1. The support provided by the support member 6 makes the air guide channel 1 stable and reliable during the operation of the transformer, maintains a fixed position unchanged, and ensures the stability of the air volume guide. The upper part of the adjustment member 7 is connected to the support member 6, and a locking member is provided between the support member 6 and the adjustment member 7. The lower part of the adjustment member 7 is connected to the upper part of the transformer body 102. When the locking member between the support member 6 and the adjustment member 7 is loosened, the support member 6 can move up and down along the adjustment member 7 to adjust the height position of the support member 6, and then adjust the height position of the air guide channel 1 in the transformer box 100. After the air guide channel 1 is adjusted to the required height, the locking member between the support member 6 and the adjustment member 7 is locked to fix the air guide channel 1. The displacement of the air guide channel 1 in the height direction is adjustable, which can avoid the problem of the air guide channel 1 and the top of the transformer box 100 not being able to fit due to manufacturing errors or the air leakage caused by excessive fitting gaps.

[0025] In this embodiment, the support member 6 is made of steel or alloy material, has high structural strength, and has good load-bearing capacity. The thickness of the support member 6 can be selected as 3mm, 4mm, 5mm, 6mm, 8mm or 10mm according to the working conditions and specific material properties. The adjustment member 7 is a threaded slide rod. The nut provided between the support member 6 and the adjustment member 7 is loosened for locking. The linear displacement of the support member 6 in the vertical direction drives the air guide channel 1 to move in the vertical direction, thereby eliminating the gap between the air guide channel 1 and the top of the transformer box 100 when they are matched, thereby ensuring the sealing of the air guide channel 1. In other embodiments, the support member 6 can also be set on the inner wall of the transformer box 100 or other positions in the transformer box 100, or can be connected and fixed to the outside of the air guide channel 1; the adjustment member 7 can also adopt a modular pad or an elastic deformable body or a telescopic sleeve or a wedge block.

[0026] like Figure 1 As shown, a filter 8 is provided on the top of the air guide channel 1 to prevent foreign objects such as fasteners on the top of the transformer box 10 from falling into the transformer body 102, thereby improving the stability of the transformer operation.

[0027] like Figure 1 As shown, a positioning block 9 is provided at the bottom of the air guide channel 1. The positioning block 9 is used to assist in positioning the air guide channel 1 on the top of the coil 101, ensuring the concentricity of the coil 101 and the air guide channel 1, so that the airflow is evenly distributed around the transformer body.

[0028] like Figure 1 As shown, a sealing strip 10 is provided at the top of the air guide channel 1. This sealing strip 10 is used to achieve a sealed connection between the air guide channel 1 and the transformer housing 100, ensuring the overall sealing of the air guide channel 1 and preventing air leakage. In this embodiment, the bottom dimensions and structure of the air guide channel 1 are aligned with the transformer coil 101, and the top of the air guide channel 1 closely matches the exhaust vent at the top of the transformer housing 100, allowing the hot air generated by the transformer body 102 to be discharged to the air outlet 3 through a single, stable channel.

[0029] like Figure 1As shown, a mounting bracket 5 is provided on the outside of the top of the transformer box 100, and the cooling fan 4 is installed on the mounting bracket 5. And multiple cooling fans 4 are evenly distributed within the radiation range of the air guide channel 1 to achieve balanced airflow distribution. In other embodiments, the cooling fan 4 can also be placed on the upper part of the four sides of the box according to the actual layout of the transformer box 100; the installation position of the cooling fan 4 is equipped with a protective net and filter cotton according to the protection level requirements. By arranging a centrifugal fan on the top of the transformer box 100, forced exhaust is used to generate negative pressure in the channel to guide the external cold air at the bottom to be sucked into the transformer box 100, and after flowing through the transformer air duct, a hot air flow is formed and then flows upward through the air guide channel 1 and finally discharged from the transformer box 100. This method can make the heat dissipation air volume evenly distributed on the transformer body, ensure the overall heat dissipation of the transformer is balanced, and can greatly reduce the coil resin cracking phenomenon that may be caused by excessive local temperature rise due to uneven heat dissipation.

[0030] This embodiment utilizes the principle of negative pressure exhaust and heat dissipation, coupled with a directional, anti-interference air guide channel 1, to provide an efficient, uniform, and stable cooling and heat dissipation system for epoxy-cast transformers. This heat dissipation system eliminates the cooling effect's dependence on the fan's position and blowing angle; eliminates airflow obstruction and interference from other structural components within the enclosure, preventing localized eddy currents; ensures precise single-directional cooling, improving airflow efficiency; and enhances the uniformity and stability of the transformer's overall heat dissipation. It also significantly reduces the likelihood of localized cracking in the transformer coils due to uneven heat dissipation.

[0031] In other embodiments, a heat dissipation fan may be configured at the bottom of the transformer to further enhance the heat dissipation effect.

[0032] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A wind and heat dissipation system for epoxy cast transformers, characterized in that: The invention comprises an air guide channel (1), a cooling fan (4) and a channel support frame; the air guide channel (1) is arranged inside the transformer box (100) and is located between the hot air flow outlet at the top of the coil (101) and the exhaust port on the upper part of the transformer box (100), so as to guide the hot air flow generated by the transformer body (102) to the exhaust port; the channel support frame is arranged on the upper part of the transformer body (102) to support the air guide channel (1) and adjust the installation position of the air guide channel (1) in the transformer box (100); the lower part of the transformer box (100) is provided with an air inlet (2), and the air inlet (2) is located at the bottom of the coil (101); the cooling fan (4) is arranged on the outer side of the upper part of the transformer box (100) and is connected to the exhaust port on the upper part of the transformer box (100); the side of the cooling fan (4) is provided with an air outlet (3) to extract the hot air flow inside the transformer box (100) to achieve heat dissipation of the transformer.

2. The air guide and heat dissipation system for epoxy cast transformer according to claim 1, characterized in that: The channel support frame comprises a support member (6) and an adjusting member (7), wherein the support member (6) is connected to the adjusting member (7) and the air guide channel (1) respectively, and the adjusting member (7) is connected to the upper part of the transformer body (102); the adjusting member (7) is used to adjust the height position of the support member (6), thereby adjusting the height position of the air guide channel (1) in the transformer box (100).

3. The air guide and heat dissipation system for epoxy cast transformer according to claim 2, characterized in that: A positioning block (9) is provided at the bottom of the air guide channel (1), and the positioning block (9) is used to assist in positioning the air guide channel (1) on the top of the coil (101).

4. The air guide and heat dissipation system for epoxy cast transformer according to claim 2, characterized in that: A sealing strip (10) is provided on the top of the air guide channel (1), and the sealing strip (10) is used to achieve a sealed connection between the air guide channel (1) and the transformer box (100).

5. The air guide and heat dissipation system for epoxy cast transformer according to any one of claims 1 to 4, characterized in that: A filter (8) is provided at the top of the air guide channel (1) to prevent foreign matter from falling into the transformer body (102).

6. The air guide and heat dissipation system for epoxy cast transformer according to any one of claims 1 to 4, characterized in that: The air guide channel (1) is enclosed by high-temperature resistant insulating boards.

7. The air guide and heat dissipation system for epoxy cast transformer according to any one of claims 1 to 4, characterized in that: The cooling fan (4) is a centrifugal fan, an axial flow fan, or a mixed flow fan.

8. The air guide and heat dissipation system for epoxy cast transformer according to any one of claims 1 to 4, characterized in that: A mounting frame (5) is provided on the outer side of the top of the transformer box (100), and the cooling fan (4) is mounted on the mounting frame (5). A plurality of cooling fans (4) are evenly distributed within the radiation range of the air guide channel (1) to achieve balanced airflow distribution.

9. The air guide and heat dissipation system for epoxy cast transformer according to any one of claims 2 to 4, characterized in that: The adjusting member (7) is a threaded sliding rod, a modular pad, an elastic deformable body, a telescopic sleeve, or a wedge block.

10. The air guide and heat dissipation system for epoxy cast transformer according to any one of claims 2 to 4, characterized in that: The support member (6) is made of steel or alloy material.

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