Dry-type distribution transformer

Abstract

The utility model discloses a kind of distribution network dry-type transformer, including upper clamp, iron core, winding and lower clamp, the upper clamp and lower clamp are respectively fixed in the upper portion and lower portion of iron core, the bottom of lower clamp is equipped with base, the winding is set around iron core, the winding includes low voltage winding and high voltage winding sequentially arranged from inside to outside, the both sides of lower clamp are equipped with cooling fan, insulation cylinder with liquid cooling mechanism is arranged between low voltage winding and high voltage winding, the insulation cylinder with liquid cooling mechanism includes cylinder body and cooling liquid passage arranged in cylinder body wall, the bottom of insulation cylinder is equipped with cooling liquid inlet and cooling liquid outlet, cooling liquid inlet and cooling liquid outlet are respectively located at both ends of cooling liquid passage. Solve the problem that existing dry-type transformer uses air cooling to dissipate heat, and the effect is poor.

Description

Technical Field

[0001] This utility model relates to the field of transformers, and in particular to a dry-type transformer for power distribution networks. Background Technology

[0002] A dry-type transformer is a type of transformer that does not rely on oil immersion cooling. Its core structure consists of an iron core and windings, and it mainly achieves heat dissipation through air cooling.

[0003] In order to improve the heat dissipation efficiency of dry-type transformers, two cooling fans are often installed on both sides of the lower part of the dry-type transformer for air cooling. However, after practice, we believe that the cooling effect is limited, mainly because the low-voltage winding is inside the high-voltage winding, and the heat emitted is not easily carried away. Therefore, in order to further improve the heat dissipation effect of dry-type transformers, we need to improve the existing dry-type transformers. Utility Model Content

[0004] The purpose of this invention is to provide a dry-type transformer for power distribution networks, which solves the problem that existing dry-type transformers use air cooling for heat dissipation, resulting in poor performance.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A dry-type transformer for power distribution networks includes a base, an upper clamp, an iron core, windings, and a lower clamp. The upper and lower clamps are fixed to the upper and lower parts of the iron core, respectively. The bottom of the lower clamp is provided with a base. The windings are arranged around the iron core and include a low-voltage winding and a high-voltage winding arranged sequentially from the inside to the outside. Cooling fans are provided on both sides of the lower clamp. An insulating cylinder with a liquid cooling mechanism is provided between the low-voltage winding and the high-voltage winding. The insulating cylinder with the liquid cooling mechanism includes a cylinder body and a coolant channel provided in the cylinder body wall. The bottom of the insulating cylinder is provided with a coolant inlet and a coolant outlet, which are located at the two ends of the coolant channel, respectively.

[0007] In this solution, the original air-cooled structure is changed to a combination of air-cooling and liquid-cooling. Since the liquid-cooling channel is located inside the wall of the insulating cylinder between the low-voltage winding and the high-voltage winding, the heat from the low-voltage winding can be easily carried away through heat transfer. Compared with a single air-cooled structure, this solution has a better cooling effect.

[0008] As a further preferred embodiment of this invention, the coolant channel is arranged in an "S" shape inside the cylinder wall.

[0009] It can maximize the length of the coolant channel, making its cooling path coverage more comprehensive, and enabling more efficient and stable liquid cooling.

[0010] As a further preferred embodiment of this invention, the coolant channel has a dual-channel structure, comprising a front half-cooling channel and a rear half-cooling channel arranged in parallel.

[0011] The experiment showed that the original coolant channel was a single-channel structure. If too much heat was transferred to the coolant in the first half, the liquid cooling effect in the second half would be unsatisfactory. To solve this problem, the original single-channel coolant channel was changed to a dual-channel coolant channel. The combination of the first and second half cooling channels can achieve a better cooling effect throughout the entire process.

[0012] As a further preferred embodiment of this utility model, the inner wall of the first half of the rear cooling channel is provided with a heat-insulating inner sleeve.

[0013] The specific structure that achieves the above function is to install a heat-insulating inner sleeve in the inner wall of the first half of the second half of the cooling channel. In this way, the coolant in the second half of the cooling channel hardly undergoes heat exchange in the first half, and only in the second half where there is no heat-insulating inner sleeve will heat exchange occur. This way, the cooling task can be completed well in the second half, while the cooling of the first half is achieved by the coolant in the first half of the cooling channel.

[0014] As a further preferred embodiment of this invention, the base is provided with rollers at its bottom.

[0015] The rollers can adopt a lifting structure, which facilitates the movement and installation of dry-type transformers in the power distribution network.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] 1. In this solution, the original air-cooled structure is changed to an air-cooled plus liquid-cooled method. Since the liquid-cooled channel is set inside the wall of the insulating cylinder between the low-voltage winding and the high-voltage winding, the heat at the low-voltage winding can be easily carried away through heat transfer. Compared with the single air-cooled structure, the cooling effect of this solution is better.

[0018] 2. The "S" shape can maximize the length of the coolant channel, making its cooling path coverage more comprehensive and enabling more efficient and stable liquid cooling.

[0019] 3. Through testing, it was found that the original coolant channel was a single-channel structure. If too much heat was exchanged in the first half of the channel, the cooling effect in the second half would be unsatisfactory. To solve this problem, the original single-channel coolant channel was changed to a dual-channel structure. The cooperation between the first and second half cooling channels ensures good cooling throughout the entire process. Specifically, a heat-insulating inner sleeve is installed in the inner wall of the first half of the second half cooling channel. This means that the coolant in the second half of the channel experiences almost no heat exchange in the first half, only in the latter half where the heat-insulating inner sleeve is not installed. This allows for effective cooling in the second half, while the cooling of the first half is achieved by the coolant in the first half of the channel.

[0020] 4. The rollers can adopt a lifting structure, which facilitates the movement and installation of dry-type transformers in the power distribution network. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the insulating cylinder of this utility model.

[0023] Figure 3 This is a bottom view of the winding of this utility model.

[0024] Figure 4 This is a schematic diagram of the coolant channel structure of this utility model after it has been unfolded. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Specific Implementation Example 1:

[0032] Figure 1 , Figure 2 , Figure 3 , Figure 4 A dry-type transformer for a power distribution network is shown, comprising an upper clamp 2, an iron core 3, windings 4, and a lower clamp 5. The upper clamp 2 and the lower clamp 5 are respectively fixed to the upper and lower parts of the iron core 3. The bottom of the lower clamp 5 is provided with a base 6. The windings 4 are arranged around the iron core 3 and include a low-voltage winding 41 and a high-voltage winding 42 arranged sequentially from the inside to the outside. The transformer is characterized in that: cooling fans 7 are provided on both sides of the lower clamp 5, and an insulating cylinder 8 with a liquid cooling mechanism is provided between the low-voltage winding 41 and the high-voltage winding 42. The insulating cylinder 8 with the liquid cooling mechanism includes a cylinder body 81 and a coolant channel 82 disposed in the cylinder body wall. The bottom of the insulating cylinder 8 is provided with a coolant inlet 83 and a coolant outlet 84, which are located at the two ends of the coolant channel 82, respectively.

[0033] In this solution, the original air-cooled structure is changed to a combination of air-cooling and liquid-cooling. Since the liquid-cooling channel is located inside the wall of the insulating cylinder between the low-voltage winding and the high-voltage winding, the heat from the low-voltage winding can be easily carried away through heat transfer. Compared with a single air-cooled structure, this solution has a better cooling effect. Specific Implementation Example 2:

[0035] This embodiment further describes the coolant channel 82 based on specific embodiment 1. The coolant channel 82 is arranged in an "S" shape inside the cylinder wall of the cylinder 81.

[0036] It can maximize the length of the coolant channel, making its cooling path coverage more comprehensive, and enabling more efficient and stable liquid cooling. Specific Implementation Example 3:

[0038] This embodiment further describes the coolant channel 82 based on specific embodiment 1. The coolant channel 82 has a dual-channel structure, which includes a front half cooling channel 821 and a rear half cooling channel 822 arranged in parallel.

[0039] The experiment showed that the original coolant channel was a single-channel structure. If too much heat was transferred to the coolant in the first half, the liquid cooling effect in the second half would be unsatisfactory. To solve this problem, the original single-channel coolant channel was changed to a dual-channel coolant channel. The combination of the first and second half cooling channels can achieve a better cooling effect throughout the entire process. Specific Implementation Example 4:

[0041] This embodiment further describes the rear half of the cooling channel 822 based on specific embodiment 3. The inner wall of the front half of the rear half of the cooling channel 822 is provided with a heat-insulating inner sleeve 9.

[0042] The specific structure that achieves the above function is to install a heat-insulating inner sleeve in the inner wall of the first half of the second half of the cooling channel. In this way, the coolant in the second half of the cooling channel hardly undergoes heat exchange in the first half, and only in the second half where there is no heat-insulating inner sleeve will heat exchange occur. This way, the cooling task can be completed well in the second half, while the cooling of the first half is achieved by the coolant in the first half of the cooling channel. Specific Implementation Example 5:

[0044] This embodiment further describes the base 6 based on specific embodiment 1. The base 6 is provided with rollers at its bottom.

[0045] The rollers can adopt a lifting structure, which facilitates the movement and installation of dry-type transformers in the power distribution network.

[0046] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dry-type transformer for power distribution networks, comprising an upper clamp (2), an iron core (3), windings (4), and a lower clamp (5), wherein the upper clamp (2) and the lower clamp (5) are respectively fixed to the upper and lower parts of the iron core (3), and a base (6) is provided at the bottom of the lower clamp (5), the windings (4) are arranged around the iron core (3), and the windings (4) include a low-voltage winding (41) and a high-voltage winding (42) arranged sequentially from the inside to the outside, characterized in that: Cooling fans (7) are provided on both sides of the lower clamp (5). An insulating cylinder (8) with a liquid cooling mechanism is provided between the low-voltage winding (41) and the high-voltage winding (42). The insulating cylinder (8) with a liquid cooling mechanism includes a cylinder body (81) and a coolant channel (82) provided in the cylinder body wall. A coolant inlet (83) and a coolant outlet (84) are provided at the bottom of the insulating cylinder (8). The coolant inlet (83) and the coolant outlet (84) are located at both ends of the coolant channel (82).

2. The dry-type transformer for distribution networks according to claim 1, characterized in that: The coolant channel (82) is arranged in an "S" shape inside the cylinder wall of the cylinder body (81).

3. The dry-type transformer for distribution networks according to claim 1, characterized in that: The coolant channel (82) has a dual-channel structure, which includes a front half cooling channel (821) and a rear half cooling channel (822) arranged in parallel.

4. The dry-type transformer for power distribution networks according to claim 3, characterized in that: The inner wall of the first half of the rear half cooling channel (822) is provided with a heat-insulating inner sleeve (9).

5. The dry-type transformer for distribution networks according to claim 1, characterized in that: The base (6) is provided with rollers at its bottom.

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