Dry-type transformer and box-type transformer

Abstract

The utility model relates to the field of ventilation and cooling of parts of transformers, in particular to a dry-type transformer and a box-type transformer. A box-type transformer comprises a shell, a dry-type transformer is installed in the shell, the dry-type transformer comprises a transformer winding, the transformer winding comprises a low-voltage winding and a high-voltage winding, an annular heat dissipation air channel allowing air to flow for heat dissipation is formed between the low-voltage winding and the high-voltage winding, and the dry-type transformer further comprises a heat dissipation mechanism. The heat dissipation mechanism comprises an air supply mechanism and an air exhaust pipeline connected with the air supply mechanism, the shape of the air exhaust pipeline is matched with that of the annular heat dissipation air channel, the air exhaust pipeline comprises split paired pipeline monomers, the paired pipeline monomers are oppositely arranged on the two sides of the axis of the low-voltage winding, a plurality of air exhaust ports facing the annular heat dissipation air channel are formed in the pipeline monomers, and the air exhaust ports face the annular heat dissipation air channel. The exhaust duct is located in the gap between the end of the transformer winding and the dry-type transformer frame and can horizontally enter and exit, and the problem that in the prior art, a box-type transformer is inconvenient to overhaul is solved.

Description

Technical Field

[0001] The utility model relates to the field of ventilation and cooling of parts of transformers or inductors, in particular to a dry-type transformer and a box-type transformer. Background Art

[0002] In the prior art, in order to dissipate heat from the coil of a dry-type transformer, a corresponding heat dissipation fan is generally arranged outside the coil. At present, the fans equipped with dry-type transformers on the market are all ordinary cross-flow fans. After being fixed, the air from the fan will blow on the fixed square tube of the transformer and then return, making it impossible for the air volume to effectively enter the transformer, resulting in a greatly reduced utilization efficiency of the fan, which also results in the inability of the transformer to effectively and quickly cool down. In order to protect the transformer, manufacturers on the market generally choose large air volume and high power fans that are far greater than the heat dissipation requirements of the transformer, taking into account the loss of fan efficiency, but this not only increases the cost of the fan, but also increases the power loss.

[0003] The Chinese utility model patent with the authorization announcement number CN216849562U discloses a dry-type transformer, including a transformer body, the transformer body including a high-voltage winding and a low-voltage winding, a first annular air duct is arranged on the outer side of the bottom of the high-voltage winding, a plurality of vertically upward air nozzles are arranged on the first annular air duct, the first annular air duct is connected to the fan, a second annular air duct is arranged at the bottom of the gap formed by the high-voltage winding and the low-voltage winding, the second annular air duct is connected to the first annular air duct through a connecting pipe, and a plurality of vertically upward air nozzles are evenly arranged on the second annular air duct. The wind of the fan is sent between the high-voltage winding and the low-voltage winding through each air nozzle, so that the transformer disclosed in the patent does not need an overly powerful fan to achieve a relatively good heat dissipation effect. However, when assembling the transformer disclosed in the patent, it is necessary to adjust the position of the two annular air ducts connected as a whole before installing the low-voltage winding and the high-voltage winding, which increases the difficulty of installing the entire transformer. Furthermore, if the air duct fails and heat dissipation fails and needs to be replaced, the dry-type transformer disclosed in the patent cannot be quickly repaired. Furthermore, if an existing dry-type transformer is to be modified, it is extremely difficult to install the corresponding annular air duct into the dry-type transformer to meet the heat dissipation requirements. Utility Model Content

[0004] The utility model aims to provide a dry-type transformer to solve the problem that the heat dissipation device of the dry-type transformer in the prior art is difficult to install and disassemble, resulting in inconvenient maintenance. The utility model also provides a box-type transformer to solve the problem that the box-type transformer in the prior art is difficult to maintain.

[0005] A dry-type transformer comprises a transformer winding, wherein the transformer winding comprises a low-voltage winding and a high-voltage winding sleeved outside the low-voltage winding, wherein an annular heat dissipation air duct for air flow to dissipate heat is formed between the low-voltage winding and the high-voltage winding, wherein the dry-type transformer further comprises a heat dissipation mechanism, wherein the heat dissipation mechanism comprises an air supply mechanism and an exhaust duct connected to the air supply mechanism, wherein the shape of the exhaust duct matches the shape of the annular heat dissipation air duct, wherein the exhaust duct comprises a pair of separately arranged duct monomers, wherein the paired duct monomers are arranged oppositely on both sides of an axis of the low-voltage winding, wherein a plurality of exhaust ports facing the annular heat dissipation air duct are provided on the duct monomers, and wherein the exhaust duct is located in a gap between an end of the transformer winding and a frame of the dry-type transformer and can be horizontally introduced in and out of the gap.

[0006] Furthermore, the dry-type transformer is a three-phase transformer, which includes three transformer windings arranged in parallel, and the arrangement direction of the two paired pipeline monomers is perpendicular to the arrangement direction of the transformer windings.

[0007] Furthermore, the exhaust duct also includes a main air supply pipe connecting the duct monomers on the same side with the air supply mechanism, and the main air supply pipe extends along the arrangement direction of the transformer windings and is connected to the middle position of each duct monomer.

[0008] Furthermore, the air supply mechanism includes two independent fans, which are respectively connected to corresponding main air supply pipes.

[0009] Furthermore, the fan is connected to the middle position of the main air supply duct.

[0010] Furthermore, the fan is fixedly mounted on the dry-type transformer frame and is located on a side of the main air supply duct facing away from the transformer winding, and the fan is located in the middle of the main air supply duct.

[0011] Furthermore, the main air supply pipe and the pipe monomer connected to the main air supply pipe are integrally molded insulating pipes.

[0012] Furthermore, the pipeline monomer is a U-shaped pipeline.

[0013] Furthermore, the exhaust duct is located at the bottom of the transformer winding.

[0014] The utility model improves the prior art. Specifically, the utility model improves the annular air duct in the dry-type transformer in the prior art, and replaces the complete annular air duct with an exhaust duct. The exhaust duct includes a pair of pipe monomers arranged relatively on both sides of the axis of the low-voltage winding. The pipe monomers are combined to form a ring that matches the annular heat dissipation air duct. The exhaust duct is located in the gap between the end of the transformer winding and the dry-type transformer frame and can be horizontally in and out. During installation, after the dry-type transformer is assembled, the exhaust duct is sent into the gap between the end of the transformer winding and the dry-type transformer frame, and then the exhaust duct is connected to the air supply mechanism. If there is a problem with the exhaust duct and it cannot work normally, the exhaust duct can be taken out from the gap between the end of the transformer winding and the dry-type transformer frame for inspection or replacement. In summary, compared with the prior art, the dry-type transformer of the utility model has a simpler installation and disassembly of the heat dissipation device and is easier to repair, which solves the problem that the heat dissipation device of the dry-type transformer in the prior art is difficult to install and disassemble, resulting in inconvenience in repair.

[0015] Furthermore, corresponding exhaust ducts and corresponding air supply mechanisms may be added to the existing dry-type transformer, so that the heat dissipation problem of the existing dry-type transformer is optimized.

[0016] A box-type transformer comprises a shell, in which a dry-type transformer is installed, the dry-type transformer comprises a transformer winding, the transformer winding comprises a low-voltage winding and a high-voltage winding sleeved outside the low-voltage winding, an annular heat dissipation air duct for air flow to dissipate heat is formed between the low-voltage winding and the high-voltage winding, the dry-type transformer also comprises a heat dissipation mechanism, the heat dissipation mechanism comprises an air supply mechanism and an exhaust duct connected to the air supply mechanism, the shape of the exhaust duct is adapted to the shape of the annular heat dissipation air duct, the exhaust duct comprises a pair of pipe monomers arranged separately, the pair of pipe monomers are arranged oppositely on both sides of the axis of the low-voltage winding, a plurality of exhaust ports facing the annular heat dissipation air duct are opened on the pipe monomer, the exhaust duct is located in the gap between the end of the transformer winding and the dry-type transformer frame and can enter and exit horizontally.

[0017] Furthermore, the dry-type transformer is a three-phase transformer, which includes three transformer windings arranged in parallel, and the arrangement direction of the two paired pipeline monomers is perpendicular to the arrangement direction of the transformer windings.

[0018] Furthermore, the exhaust duct also includes a main air supply pipe connecting the duct monomers on the same side with the air supply mechanism, and the main air supply pipe extends along the arrangement direction of the transformer windings and is connected to the middle position of each duct monomer.

[0019] Furthermore, the air supply mechanism includes two independent fans, which are respectively connected to corresponding main air supply pipes.

[0020] Furthermore, the fan is connected to the middle position of the main air supply duct.

[0021] Furthermore, the fan is fixedly mounted on the dry-type transformer frame and is located on a side of the main air supply duct facing away from the transformer winding, and the fan is located in the middle of the main air supply duct.

[0022] Furthermore, the main air supply pipe and the pipe monomer connected to the main air supply pipe are integrally molded insulating pipes.

[0023] Furthermore, the pipeline monomer is a U-shaped pipeline.

[0024] Furthermore, the exhaust duct is located at the bottom of the transformer winding.

[0025] The utility model improves the prior art. Specifically, the utility model improves the annular air duct in the box-type transformer dry-type transformer in the prior art, and replaces the complete annular air duct with an exhaust duct. The exhaust duct includes a pair of pipe monomers arranged relatively on both sides of the axis of the low-voltage winding. The pipe monomers are combined to form a ring that matches the annular heat dissipation air duct. The exhaust duct is located in the gap between the end of the transformer winding and the dry-type transformer frame and can be horizontally entered and exited. During installation, after the dry-type transformer is assembled, the exhaust duct is sent into the gap between the end of the transformer winding and the dry-type transformer frame, and then the exhaust duct is connected to the air supply mechanism. If there is a problem with the exhaust duct and it cannot work normally, the exhaust duct can be taken out from the gap between the end of the transformer winding and the dry-type transformer frame for inspection or replacement. In summary, compared with the prior art, the box-type transformer of the utility model is easier to inspect and repair, which solves the problem of inconvenient inspection and repair of the box-type transformer in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The front view of the dry-type transformer of the embodiment of the box-type transformer of the utility model;

[0027] Figure 2 : A top view of a dry-type transformer of an embodiment of a box-type transformer of the utility model;

[0028] Figure 3 The figure is: an axonometric view of a dry-type transformer of an embodiment of a box-type transformer of the utility model;

[0029] Figure 4 The structure diagram of the heat dissipation mechanism of the dry-type transformer of the embodiment of the box-type transformer of the utility model is as follows;

[0030] Figure 5 : A left side view of an embodiment of a box-type transformer of the utility model;

[0031] Figure 6 : The right side view of the embodiment of the box-type transformer of the utility model.

[0032] In the figure: 1. Fan; 2. Pipeline unit; 3. Low-voltage winding; 4. High-voltage winding; 5. Main air supply duct; 6. Support beam; 7. Exhaust port; 8. Nozzle; 9. Dry-type transformer frame; 10. Annular heat dissipation duct; 11. Shell; 12. Inlet channel; 13. Exhaust channel. DETAILED DESCRIPTION

[0033] The main concept of the box-type transformer of the utility model:

[0034] A box-type transformer comprises a shell, in which a dry-type transformer is installed, the dry-type transformer comprises a transformer winding, the transformer winding comprises a low-voltage winding and a high-voltage winding sleeved outside the low-voltage winding, an annular heat dissipation air duct for air flow to dissipate heat is formed between the low-voltage winding and the high-voltage winding, the dry-type transformer also comprises a heat dissipation mechanism, the heat dissipation mechanism comprises an air supply mechanism and an exhaust duct connected to the air supply mechanism, the shape of the exhaust duct is adapted to the shape of the annular heat dissipation air duct, the exhaust duct comprises a pair of pipe monomers arranged separately, the pair of pipe monomers are arranged oppositely on both sides of the axis of the low-voltage winding, a plurality of exhaust ports facing the annular heat dissipation air duct are opened on the pipe monomer, the exhaust duct is located in the gap between the end of the transformer winding and the dry-type transformer frame and can enter and exit horizontally.

[0035] The utility model improves the prior art: the utility model sets a corresponding exhaust duct on the dry-type transformer of the box-type transformer, and the exhaust duct includes a pair of split pipe monomers, and the paired pipe monomers are combined to match the annular heat dissipation air duct. The annular air guide pipe is replaced by the pipe monomer. And the exhaust duct can horizontally enter and exit the gap between the transformer winding and the dry-type transformer frame. The exhaust duct can be installed in the gap between the transformer winding and the dry-type transformer frame after the high-voltage winding and the low-voltage winding of the dry-type transformer are assembled. Compared with the prior art, the exhaust duct of the dry-type transformer of the utility model can be installed relatively conveniently, and if the exhaust duct fails, it can also be relatively easily disassembled for inspection or replacement. At the same time, it can also be modified for the existing dry-type transformer to meet the heat dissipation requirements of the existing dry-type transformer. In summary, the utility model solves the problem of inconvenient maintenance of box-type transformers in the prior art.

[0036] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0037] Embodiment 1 of the box-type transformer of the utility model:

[0038] like Figure 1-6As shown: a box-type transformer includes a shell 11, in which a dry-type transformer is installed. The dry-type transformer includes a transformer winding, which includes a low-voltage winding 3 and a high-voltage winding 4 sleeved outside the low-voltage winding 3. An annular heat dissipation duct 10 for air flow to dissipate heat is formed between the low-voltage winding 3 and the high-voltage winding 4. The dry-type transformer also includes a heat dissipation mechanism, which includes an air supply mechanism and an exhaust duct connected to the air supply mechanism. The shape of the exhaust duct is adapted to the shape of the annular heat dissipation duct 10. The exhaust duct includes a pair of pipe monomers 2 that are separately arranged, and both ends of the pipe monomers 2 are blocked. The paired pipe monomers 2 are relatively arranged on both sides of the axis of the low-voltage winding 3. A plurality of exhaust ports 7 facing the annular heat dissipation duct 10 are opened on the pipe monomer 2. The exhaust duct is located in the gap between the end of the transformer winding and the dry-type transformer frame 9 and can enter and exit horizontally.

[0039] The exhaust duct is located in the gap between the end of the transformer winding and the dry-type transformer frame 9 and can enter and exit horizontally, that is, the exhaust duct is located between the top of the transformer winding and the dry-type transformer frame 9 or between the bottom of the transformer winding and the dry-type transformer frame 9. Since the density of hot air is low, the hot air will rise. In order to achieve a better heat dissipation effect, the exhaust duct is located between the bottom of the transformer winding and the dry-type transformer frame 9 in this embodiment.

[0040] The dry-type transformer can be a single-phase dry-type transformer or a three-phase dry-type transformer. When the dry-type transformer is a three-phase dry-type transformer, the dry-type transformer includes three transformer windings arranged in parallel, and the arrangement direction of the two paired pipe monomers 2 is perpendicular to the arrangement direction of the transformer windings. Two pipe monomers 2 are arranged between the bottom of each transformer winding and the dry-type transformer frame 9, with a total of six pipe monomers 2. The pipe monomer 2 is arranged perpendicular to the arrangement direction of the transformer winding, and the pipe monomer 2 enters and exits the gap between the end of the transformer winding and the dry-type transformer frame 9 in the direction perpendicular to the transformer winding. Compared with the pipe monomer 2 being arranged parallel to the arrangement direction of the transformer winding, the pipe monomer 2 enters and exits the gap between the end of the transformer winding and the dry-type transformer frame 9 in the direction parallel to the transformer winding. Relatively speaking, it is easier for the pipe monomer 2 to enter and exit the gap between the end of the transformer winding and the dry-type transformer frame 9, making it easier for the pipe monomer 2 to be installed in or removed from the dry-type transformer.

[0041] A total of six pipe monomers 2 are provided, and each pipe monomer 2 can be connected to an air supply mechanism for heat dissipation. However, if one pipe monomer 2 is connected to an air supply mechanism to achieve heat dissipation, the cost is relatively high. Therefore, preferably: the exhaust duct also includes a main air supply pipe 5 that connects the pipe monomer 2 on the same side to the air supply mechanism, and the main air supply pipe 5 extends along the arrangement direction of the transformer winding and is connected to the middle position of each pipe monomer 2. A main air supply pipe 5 is provided on each side of the arrangement direction of the transformer winding, and the main air supply pipe 5 is connected to the corresponding pipe monomer 2 respectively. By providing the main air supply pipe 5 and connecting the corresponding three pipe monomers 2 by relying on the main air supply pipe 5, the number of air supply mechanisms is only two at most to achieve heat dissipation of the transformer winding, which is relatively cost-saving. In addition, the main air supply pipe 5 is connected to the middle position of the pipe monomer 2, so that the airflow discharged from the exhaust port 7 on the pipe monomer 2 is relatively uniform, further optimizing the heat dissipation effect of the dry-type transformer.

[0042] The air supply mechanism can use one fan 1. For example: the fan 1 is installed at the end of the three-phase transformer winding arranged side by side, and is in the same straight line as the three transformer windings. The air outlet of the fan 1 is connected to a structure similar to a three-way joint, and the other two ends of the three-way joint are respectively connected to the main air supply pipe 5. However, the use of one fan 1 for air supply requires a large power of the fan 1. At this time, the volume of the fan 1 is relatively large, and the space occupied is also relatively large. Therefore, preferably, the air supply mechanism includes two independent fans 1, and the fans 1 are respectively connected to the corresponding main air supply pipes 5. By using two fans 1 and connecting the two fans 1 to the corresponding main air supply pipes 5, the volume of a single fan 1 is reduced, the space occupied is relatively small, and the structure of the entire dry-type transformer is more compact during installation. Further optimization, the fan 1 is connected to the middle position of the main air supply pipe 5. The connection between the fan 1 and the middle position of the main air supply pipe 5 can make the air volume of the pipeline monomer 2 on the same side as equal as possible, thereby ensuring the heat dissipation effect of the transformer winding and preventing the situation where one transformer winding has a lower temperature and the other transformer winding has a higher temperature. For example: the fan 1 is installed on both sides of the winding of the dry-type transformer, and the air outlet of the fan 1 is connected to the middle position of the main air supply pipe 5 through a hose. However, in this way, the distance between the fan 1 and the main air supply pipe 5 is too long, and the cooling air flow rate loss is large. Therefore, further optimization, the fan 1 is fixedly installed on the dry-type transformer frame 9 and is on the side of the main air supply pipe facing away from the transformer winding, and the fan 1 is in the middle position of the main air supply pipe 5, which ensures that the distance between the fan 1 and the main air supply pipe 5 is the shortest. Shortening the distance between the fan 1 and the main air supply pipe 5 as much as possible can save materials relatively and reduce the loss of cooling air. At the same time, for further optimization, the fan 1 and the main air supply pipe 5 are roughly at the same height. The fan 1 is at approximately the same height as the main air supply duct 5, so that the cooling air can directly enter the main air supply duct 5, reducing the corresponding loss. In this embodiment, a support beam 6 is installed on the dry-type transformer frame 9, and a fan 1 is installed on the support beam 6, so that the fan 1 is at approximately the same height as the main air supply duct 5. Of course, in other embodiments, the fan 1 can also be installed on the dry-type transformer frame 9 as long as the fan 1 and the main air supply duct 5 can be at approximately the same height.

[0043] In order to improve the safety of the dry-type transformer, preferably: the main air supply pipe 5 and the corresponding pipe monomer 2 are made of insulating material. And for further optimization, the main air supply pipe 5 and the corresponding pipe monomer 2 are integrally molded epoxy resin pipes. Of course, in other embodiments, the main air supply pipe 5 and the corresponding pipe monomer 2 can also be molded by plastic molding. After the main air supply pipe 5 and the corresponding pipe monomer 2 are molded, the surface of the corresponding pipe monomer 2 is evenly opened to form a corresponding exhaust port 7 and a corresponding nozzle 8 is installed at the exhaust port. The insulating pipe made by molding will not leak at the connection between the main air supply pipe 5 and the pipe monomer 2, further reducing the loss of cooling air. By setting the nozzle 8 to guide the cooling air, the cooling air that escapes to both sides is reduced, so that the cooling effect of the cooling air is further improved. And the exhaust pipe is made of insulating material, so that the overall safety of the dry-type transformer is also greatly improved.

[0044] There are also many choices for the shape of the pipe monomer 2. For example, the pipe monomer 2 is a J-shaped pipe, and two J-shaped pipe monomers 2 are combined into a ring structure that matches the ring-shaped heat dissipation air duct 10. However, if such a structure is adopted, it is relatively difficult to install the pipe monomer 2. Therefore, preferably, the pipe monomer 2 is a U-shaped pipe, and the bottom of the U-shaped pipe is connected to the main air supply pipe 5. Using a U-shaped pipe as the pipe monomer 2 is relatively easier to install.

[0045] A dry-type transformer is arranged in the shell 11 of the box-type transformer. Air inlet channels 12 are provided at the bottoms of the two opposite side walls of the box-type transformer, and exhaust channels 13 are provided at the tops of the two opposite side walls. At the same time, in order to further improve the gas exchange rate inside and outside the box-type transformer, an exhaust fan is also provided in the exhaust channel 13.

[0046] During assembly, the dry-type transformer is assembled first, and then the molded exhaust duct is installed in the gap between the transformer winding and the dry-type transformer frame 9, and the duct monomer 2 is ensured to be opposite to the annular heat dissipation air duct 10. Then the fan 1 is installed on the support beam 6 on the dry-type transformer frame 9 and connected to the main air supply duct 5. Then the dry-type transformer is installed in the housing 11 of the box-type transformer.

[0047] The embodiment of the dry-type transformer of the utility model: its specific structure is the same as the dry-type transformer structure in the embodiment of the box-type transformer mentioned above, and will not be described in detail in this article.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dry-type transformer, comprising a transformer winding, the transformer winding comprising a low-voltage winding and a high-voltage winding sleeved outside the low-voltage winding, an annular heat dissipation airway for air flow to dissipate heat is formed between the low-voltage winding and the high-voltage winding, the dry-type transformer also comprises a heat dissipation mechanism, the heat dissipation mechanism comprises an air supply mechanism and an exhaust duct connected to the air supply mechanism, the shape of the exhaust duct is adapted to the shape of the annular heat dissipation airway, and is characterized in that: The exhaust duct includes a pair of separately arranged duct monomers, which are arranged opposite to each other on both sides of the axis of the low-voltage winding. The duct monomers are provided with a plurality of exhaust ports facing the annular heat dissipation air duct. The exhaust duct is located in the gap between the end of the transformer winding and the dry-type transformer frame and can enter and exit horizontally.

2. The dry-type transformer according to claim 1, characterized in that: The dry-type transformer is a three-phase transformer, which includes three transformer windings arranged in parallel, and the arrangement direction of the two paired pipeline monomers is perpendicular to the arrangement direction of the transformer windings.

3. The dry-type transformer according to claim 2, characterized in that: The exhaust duct also includes a main air supply pipe connecting the duct monomers on the same side with the air supply mechanism, and the main air supply pipe extends along the arrangement direction of the transformer windings and is connected to the middle position of each duct monomer.

4. The dry-type transformer according to claim 3, characterized in that: The air supply mechanism includes two independent fans, which are respectively connected to corresponding main air supply pipes.

5. The dry-type transformer according to claim 4, characterized in that: The fan is connected to the middle position of the main air supply pipe.

6. The dry-type transformer according to claim 5, characterized in that: The fan is fixedly mounted on the dry-type transformer frame and is located on a side of the main air supply duct facing away from the transformer winding, and the fan is located in the middle of the main air supply duct.

7. The dry-type transformer according to any one of claims 3 to 6, characterized in that: The main air supply pipe and the pipe monomer connected to the main air supply pipe are integrally molded insulating pipes.

8. The dry-type transformer according to any one of claims 1 to 6, characterized in that: The pipeline monomer is a U-shaped pipeline.

9. The dry-type transformer according to any one of claims 1 to 6, characterized in that: The exhaust duct is located at the bottom of the transformer winding.

10. A box-type transformer, comprising a housing, in which a dry-type transformer is installed, characterized in that: The dry-type transformer is the dry-type transformer described in any one of claims 1 to 9.

Images