Heat dissipation structure of dry-type transformer, dry-type transformer and frequency converter

Abstract

The utility model discloses a heat dissipation structure of a dry-type transformer, the dry-type transformer, a frequency converter and electric equipment, and relates to the technical field of dry-type transformers. The heat dissipation structure of the dry-type transformer comprises a shell used for being arranged on the periphery of a winding of the dry-type transformer in a sleeving mode; the shell is provided with a first air inlet and an air outlet which are oppositely arranged in the height direction of the shell, a second air inlet is further formed in the middle of the shell, cold air is led in from the first air inlet in the bottom of the winding and can also enter from the middle to form an upper air flow and a lower air flow, and it is ensured that the upper portion of the winding can obtain fresh cold air as well; the flow distance of air in the winding is reduced, and the temperature rise of the air in the transmission process is reduced, so that the cooling uniformity and cooling efficiency of the whole winding are improved, the local overheating phenomenon is reduced, and the service life of the transformer is prolonged; and the middle and upper regions of the winding can be more conveniently checked.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a heat dissipation structure for a dry-type transformer, a dry-type transformer, and a frequency converter. Background Technology

[0002] Current open-type dry-type transformers employ a specific heat dissipation design, which involves installing a duct shell made of insulating material around the transformer windings. This design achieves heat dissipation by forcing cool air in from the bottom of the windings, allowing it to rise along the windings, and finally exhausting it from the top.

[0003] However, the heat dissipation design of this open-type dry-type transformer has two main problems: cooling air is only introduced from the bottom of the winding and must travel the entire height of the winding to reach the top. Due to the long path, the air is gradually heated during this process, resulting in a higher temperature when it reaches the upper part of the winding, thus reducing the cooling efficiency for the hotter upper part. Utility Model Content

[0004] The main purpose of this invention is to propose a heat dissipation structure for a dry-type transformer, a dry-type transformer, and a frequency converter, aiming to solve the problem of low cooling efficiency of existing dry-type transformers.

[0005] To achieve the above objectives, the heat dissipation structure of the dry-type transformer proposed in this utility model includes a housing for being fitted around the windings of the dry-type transformer. The housing has a first air inlet and an air outlet that are arranged opposite to each other in its height direction. A second air inlet is also provided in the middle of the housing.

[0006] In one embodiment, the second air inlet is located near the air outlet of the housing, relative to the first air inlet.

[0007] In one embodiment, the housing is provided with a plurality of elongated holes, which form the second air inlet.

[0008] In one embodiment, the elongated hole extends along the height direction of the housing.

[0009] In one embodiment, the elongated hole is configured as a rectangular hole or an elliptical hole.

[0010] In one embodiment, the plurality of elongated holes are arranged at circumferential intervals along the housing.

[0011] In one embodiment, the plurality of elongated holes are spaced apart along the height direction of the housing.

[0012] This utility model also proposes a dry-type transformer, which includes:

[0013] Windings; and,

[0014] A heat dissipation structure includes a housing for being fitted around the windings of a dry-type transformer. The housing has a first air inlet and an air outlet that are arranged opposite each other in its height direction. A second air inlet is also provided in the middle of the housing.

[0015] In one embodiment, the dry-type transformer further includes a suction device, which is provided corresponding to the air outlet of the housing.

[0016] This utility model also proposes a frequency converter, which includes a dry-type transformer, the dry-type transformer comprising:

[0017] Windings; and,

[0018] A heat dissipation structure includes a housing for being fitted around the windings of a dry-type transformer. The housing has a first air inlet and an air outlet that are arranged opposite each other in its height direction. A second air inlet is also provided in the middle of the housing.

[0019] In this invention, a second air inlet is provided in the middle of the housing. Cold air is introduced not only from the first air inlet at the bottom of the winding but also from the middle, forming two airflows. This ensures that the upper part of the winding also receives fresh cold air, reducing the airflow distance within the winding and lowering the temperature rise during air transmission. This improves the cooling uniformity and efficiency of the entire winding. By rationally arranging the positions of the first air inlet, the second air inlet, and the air outlet, the airflow distribution within the housing can be optimized, allowing cold air to more evenly cover the winding surface, reducing localized overheating and extending the transformer's service life. Furthermore, the second air inlet in the middle allows technicians to more easily inspect the middle and upper areas of the winding without completely disassembling the equipment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an embodiment of the heat dissipation structure of a dry-type transformer in the related art;

[0022] Figure 2A schematic diagram of the left side structure of an embodiment of the dry-type transformer provided by this utility model;

[0023] Figure 3 for Figure 2 A schematic diagram of the front side of a medium-dry type transformer;

[0024] Figure 4 for Figure 2 A schematic diagram of the rear side of a medium-dry type transformer.

[0025] Explanation of icon numbers:

[0026] 200', dry-type transformer

[0027] 1. Housing; a. First air inlet; b. Second air inlet; b1. Elongated hole; c. Air outlet;

[0028] 200. Dry-type transformer; 2. Winding.

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] 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 embodiments described 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 making creative efforts shall fall within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] Please see Figure 1 The heat dissipation design of the open-type dry-type transformer 200' has two main problems: First, cooling air is introduced only from the bottom of the windings and must traverse the entire height of the windings to reach the top. Due to the long path, the air is gradually heated during this process, resulting in a higher temperature by the time it reaches the upper part of the windings, thus reducing cooling efficiency for the hotter upper sections. Second, the insulation material used for the air duct casing is not transparent, making it impossible for technicians to directly observe the internal condition of the windings when equipment malfunctions, increasing the difficulty of fault diagnosis.

[0034] This invention proposes a heat dissipation structure for dry-type transformers, aiming to solve the problem of low cooling efficiency in existing dry-type transformers.

[0035] Please see Figures 2 to 4 In one embodiment of the present invention, the heat dissipation structure of the dry-type transformer 200 includes a housing 1 for being sleeved around the winding 2 of the dry-type transformer 100. The housing 1 has a first air inlet a and an air outlet c arranged opposite to each other in its height direction. A second air inlet b is also provided in the middle of the housing 1.

[0036] Understandably, the housing 1 is fitted around the winding 2 to protect the winding 2 and provide an effective cooling channel. The housing 1 is made of insulating material to ensure electrical safety.

[0037] The first air inlet a is located on one side of the housing 1 and is used to introduce cooling air.

[0038] The air outlet c is located on the other side of the housing 1, opposite to the first air inlet a, and is used to discharge heated air.

[0039] The second air inlet b is located in the middle of the housing 1 and is used to supplement cold air to ensure that the upper part of the stacked winding 2 can also get enough cooling.

[0040] When cold air enters the housing 1 through the first air inlet a, it flows upward along the lower part of the winding 2, forming the main cooling path. After absorbing heat, it is discharged from the air outlet c. Cold air enters the middle part of the housing 1 through the second air inlet b, directly cooling the upper area of ​​the winding 2. Then, it mixes with the hot air in the main cooling path and is discharged from the air outlet c.

[0041] In this invention, a second air inlet b is provided in the middle of the housing 1. Cold air is introduced not only from the first air inlet a at the bottom of the winding 2, but also from the middle, forming two airflows. This ensures that the upper part of the winding 2 also receives fresh cold air, reducing the airflow distance inside the winding 2 and lowering the temperature rise during air transmission. This improves the cooling uniformity and efficiency of the entire winding 2. By rationally arranging the positions of the first air inlet a, the second air inlet b, and the air outlet c, the airflow distribution within the housing 1 can be optimized, allowing cold air to more evenly cover the surface of the winding 2, reducing localized overheating and extending the transformer's service life. Furthermore, the second air inlet b in the middle allows technicians to more easily inspect the middle and upper areas of the winding 2 without completely disassembling the equipment.

[0042] It should be noted that, based on actual temperature rise tests, when the same product uses the heat dissipation structure of this application, the maximum temperature of the outer winding 2 is about 13°C lower than that of the conventional heat dissipation structure. This significantly reduces the hot spot temperature rise of the winding 2, allowing for the use of smaller wires to reduce costs during product design, while still meeting the temperature rise requirements of the transformer.

[0043] For further information, please refer to [link / reference]. Figure 2 In this embodiment, the second air inlet b is located near the air outlet c of the housing 1, relative to the first air inlet a.

[0044] It is understood that the second air inlet b is located in the middle of the housing 1 and close to the air outlet c, and the distance between the second air inlet b and the air outlet c is relatively close.

[0045] After entering through the second air inlet b, the cold air flows directly to the upper region of the winding 2, reducing the airflow distance within the winding 2. Due to the shorter distance, the temperature rises less when the cold air reaches the upper part of the winding 2, thus enabling more effective cooling of the upper part of the winding 2.

[0046] Meanwhile, after the cold air enters from the middle, it merges with the cold air entering from the first air inlet a and is discharged together from the air outlet c, reducing airflow turbulence and improving cooling uniformity and efficiency.

[0047] Since the second air inlet b is close to the air outlet c, the cold air flows quickly to the air outlet c after entering the housing 1, reducing the possibility of hot air flowing back to the lower part of the winding 2 and further improving the cooling effect.

[0048] It is understood that there are many ways to form the second air inlet b. For example, multiple small holes in a honeycomb pattern can be provided on the housing 1, or it can be set as a louver-type air inlet channel. In this embodiment, multiple elongated holes b1 are provided on the housing 1, and the multiple elongated holes b1 form the second air inlet b.

[0049] It is understood that each of the elongated holes b1 is elongated, and its length and width are designed according to actual needs to ensure sufficient air intake.

[0050] By setting the elongated hole b1, not only can air intake be well achieved, but the elongated hole b1 also makes it easier for technicians to inspect the middle and upper areas of the winding 2 without completely disassembling the equipment.

[0051] The multiple elongated holes b1 ensure that cold air enters the housing 1 from multiple locations, covering more areas of the winding 2, especially the upper area, thereby improving the uniformity of cooling.

[0052] Because multiple air inlets can disperse airflow, reduce overheating in localized areas, and ensure a more uniform temperature distribution throughout the winding 2, the multiple elongated holes b1 can provide a larger total airflow, ensuring a sufficient supply of cool air and improving cooling efficiency.

[0053] The multiple elongated holes b1 can better distribute cold air, reduce airflow turbulence, reduce airflow resistance, make it easier for cold air to enter the interior of the housing 1, and improve airflow smoothness.

[0054] For details, please continue reading Figure 2 In this embodiment, the elongated hole b1 extends along the height direction of the housing 1.

[0055] The elongated hole b1 extends along the height direction (i.e., the vertical direction) of the housing 1, rather than in the horizontal direction. That is, the elongated hole b1 extends from the middle of the housing 1 towards the top, which can cover the key area of ​​the upper part of the winding 2 as much as possible, ensuring that the cold air is evenly distributed within the height range.

[0056] Specifically, in this embodiment, the elongated hole b1 is configured as a rectangular hole or an elliptical hole.

[0057] It is understood that the rectangular hole has right-angled edges, a regular shape, and is easy to process and manufacture.

[0058] Because of the large area of ​​the rectangular hole, a greater air intake can be provided, ensuring a sufficient supply of cool air. Therefore, it is suitable for applications requiring a large flow of cooling air, such as high-power dry-type transformers 200.

[0059] The elliptical aperture has smooth curved edges, which reduces airflow resistance and improves airflow smoothness. It also reduces airflow turbulence and noise, improving cooling uniformity and efficiency. Therefore, it is suitable for applications requiring reduced airflow resistance and noise, such as locations with strict environmental noise requirements.

[0060] For further information, please refer to [link / reference]. Figures 2 to 4 In some embodiments, the plurality of elongated holes b1 are arranged at intervals along the circumference of the housing 1.

[0061] The multiple elongated holes b1 are arranged at intervals along the circumference of the housing 1, which can ensure that cold air enters the housing 1 evenly from multiple directions around the circumference of the housing 1, disperse the airflow, reduce the overheating phenomenon in local areas, and ensure that the temperature distribution of the entire winding 2 is more uniform.

[0062] Compared to a chaotic arrangement, the uniformly distributed elongated holes b1 can be designed using a standardized approach, which facilitates production and manufacturing and reduces production costs.

[0063] In some embodiments, the plurality of elongated holes b1 are spaced apart along the height direction of the housing 1.

[0064] It should be noted that the plurality of elongated holes b1 may be a first elongated hole group formed by a plurality of first elongated holes b1 spaced apart in the circumferential direction of the housing 1, and a second elongated hole group formed by a plurality of first elongated holes b1 spaced apart in the circumferential direction of the housing 1, wherein the first elongated hole group and the second elongated hole group are spaced apart in the height direction of the housing 1.

[0065] In the first embodiment, the first elongated hole group can be located above the second elongated hole group, and the plurality of elongated holes b1 in the first elongated hole group and the plurality of elongated holes b1 in the second elongated hole group can be arranged in a one-to-one correspondence and alignment in the vertical direction.

[0066] In the second embodiment, the first elongated hole group can be located above the second elongated hole group, and the plurality of elongated holes b1 of the first elongated hole group and the plurality of elongated holes b1 of the second elongated hole group can be staggered in the vertical direction, so that the housing 1 can allow air to enter at more angles in its circumferential direction.

[0067] In the third embodiment, the first elongated hole group can be located above the second elongated hole group. Between two adjacent elongated holes b1 of the second elongated hole group, one of the elongated holes b1 from the first elongated hole group is provided. The first elongated hole group extends beyond the upper end of the second elongated hole group. The overlapping part of the first elongated hole group and the second elongated hole group in the circumferential direction of the housing 1 can correspond to the position where the winding temperature of the dry-type transformer is relatively high, so that the air intake at that position is maximized, achieving the purpose of timely heat dissipation.

[0068] The arrangement of the plurality of elongated holes b1 is not limited to the examples above. Those skilled in the art may make other changes based on the technical essence of the embodiments in this specification. However, as long as the functions and effects achieved are the same as or similar to those in the embodiments of this specification, they should be covered within the protection scope of the embodiments of this specification.

[0069] This utility model also proposes a dry-type transformer 200, which includes a winding 2 and a heat dissipation structure. The specific structure of the heat dissipation structure is as described in the above embodiments. Since this dry-type transformer 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0070] Specifically, in this embodiment, the dry-type transformer 200 further includes a suction device, which is provided corresponding to the air outlet c of the housing 1.

[0071] The suction device generates negative pressure to force hot air out of the housing 1, thereby accelerating airflow and improving cooling efficiency.

[0072] By setting up the suction device, the airflow speed inside the housing 1 can be increased, thereby driving more cold air to enter from the first air inlet a and the second air inlet b, increasing the total air intake, ensuring more uniform airflow inside the housing 1, reducing airflow turbulence, reducing the circulation of hot air inside the housing 1, and further improving the cooling effect.

[0073] This utility model also proposes a frequency converter, which includes a frequency converter cabinet and a dry-type transformer 200. The specific structure of the dry-type transformer 200 is as described in the above embodiments. Since this frequency converter adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0074] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A heat dissipation structure for a dry-type transformer, characterized in that, Includes a housing for fitting around the windings of the dry-type transformer, the housing having a first air inlet and an air outlet arranged opposite each other in its height direction, wherein a second air inlet is also provided in the middle of the housing.

2. The heat dissipation structure of the dry-type transformer as described in claim 1, characterized in that, The second air inlet is located near the air outlet of the housing, relative to the first air inlet.

3. The heat dissipation structure of the dry-type transformer as described in claim 1, characterized in that, The housing is provided with a plurality of elongated holes, which form the second air inlet.

4. The heat dissipation structure of the dry-type transformer as described in claim 3, characterized in that, The elongated hole extends along the height direction of the housing.

5. The heat dissipation structure of the dry-type transformer as described in claim 3, characterized in that, The elongated hole is configured as a rectangular hole or an elliptical hole.

6. The heat dissipation structure of the dry-type transformer as described in claim 3, characterized in that, The plurality of elongated holes are arranged at intervals along the circumference of the housing.

7. The heat dissipation structure of the dry-type transformer as described in claim 3, characterized in that, The plurality of elongated holes are spaced apart along the height direction of the housing.

8. A dry-type transformer, characterized in that, include: Winding; as well as, The heat dissipation structure of the dry-type transformer as described in any one of claims 1 to 7 is sleeved around the winding.

9. The dry-type transformer as described in claim 8, characterized in that, The dry-type transformer also includes a suction device, which is provided corresponding to the air outlet of the housing.

10. A frequency converter, characterized in that, Including the dry-type transformer as described in claim 8 or 9.

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