A heat dissipation structure of a dry-type transformer with a shell

Abstract

The utility model discloses a dry -type transformer's heat dissipation structure in transformer field with shell, to the current only through the cross -flow fan of installation in the lower part of coil and blow heat dissipation, but due to dry -type transformer shell needs to satisfy certain protection class, and the inside and outside air of shell can only pass through natural convection heat dissipation, and overall heat dissipation efficiency is not high, lead to the inside and outside temperature difference of shell is obvious, the load capacity of transformer is limited the problem, present and propose the following scheme, including dry -type transformer shell, dry -type transformer body and exhaust fan, be equipped with the door of the compartment on the dry -type transformer shell, the dry -type transformer body fixed mounting is in the inside of dry -type transformer shell, the utility model discloses a simple, efficient heat dissipation channel is constructed, realized the high -efficient heat dissipation of dry -type transformer with shell, whether it is self -cooling work mode, or air -cooling work mode, the heat dissipation effect and load capacity of dry -type transformer have been obviously improved, and have the characteristics of low cost, performance improvement is obvious.

Description

Technical Field

[0001] This utility model relates to a heat dissipation structure for a dry-type transformer, and more specifically, to a dry-type transformer with a casing. Background Technology

[0002] The heat dissipation effect of dry-type transformers is closely related to the load capacity and operational safety and reliability of the equipment. Efficient heat dissipation can significantly improve the load capacity and operational reliability of dry-type transformers.

[0003] Generally, improving the heat dissipation of dry-type transformers focuses on the transformer body itself. However, in most cases, dry-type transformers are installed and operated inside the transformer casing, and can only be cooled by blowing air through a cross-flow fan installed at the bottom of the coil. However, since the transformer casing needs to meet a certain protection level, and the air inside and outside the casing can only dissipate heat through natural convection, the overall heat dissipation efficiency is not high, resulting in a significant temperature difference between the inside and outside of the casing, which limits the load capacity of the transformer.

[0004] Therefore, we propose a heat dissipation structure for a dry-type transformer with a housing. Utility Model Content

[0005] One objective of this invention is to provide a new technical solution for the heat dissipation structure of a dry-type transformer with a casing.

[0006] According to a first aspect of the present invention, a heat dissipation structure for a dry-type transformer with an outer casing is provided, including a dry-type transformer casing, a dry-type transformer body, and an exhaust fan. The dry-type transformer casing is provided with a door, and the door is provided with an observation window. The dry-type transformer body is fixedly installed inside the dry-type transformer casing. Air inlets are provided around the lower part of the dry-type transformer casing and at the bottom of the door. An air outlet is provided at the top of the dry-type transformer casing, and the exhaust fan is disposed on the air outlet. It also includes vertical wind deflectors and horizontal windbreaks; The vertical air guide plate is arranged around the outside of the three-phase high-voltage coil of the dry transformer body, and a ventilation duct is maintained between it and the outside of the high-voltage coil. The horizontal windbreak is installed on the upper side of the three-phase coil of the dry transformer and on the lower side of the upper clamp. The vertical wind guide plate is fixedly connected to the horizontal wind baffle plate. The dry transformer housing is provided with a boss. The horizontal wind baffle plate and the boss of the dry transformer housing are fixed and sealed by bolts, so that the lower space of the horizontal wind baffle plate is isolated from the upper space. The interior area of ​​the vertical wind deflector is an opening that runs through both the top and bottom; The vertical air guide plate, the horizontal wind baffle, and the dry transformer casing together form a heat dissipation air duct.

[0007] Optionally, the vertical air guide plate consists of three high-pressure side air guide plates, two side air guide plates, and three low-pressure side air guide plates. The vertical edges of the high-pressure side air guide plates, side air guide plates, and low-pressure side air guide plates are all provided with fixing holes. The high-pressure side air guide plates, side air guide plates, and low-pressure side air guide plates are fastened and installed by heat-resistant insulating cable ties through the fixing holes.

[0008] Optionally, the straight section on the front of the high-voltage side air guide plate is provided with a square hole to facilitate the installation and adjustment of the high-voltage coil tap, and the straight section on the front is installed close to the straight section of the high-voltage coil.

[0009] Optionally, insulating pads are provided on the upper outer sides of the high-pressure side air guide plate, the side air guide plate, and the low-pressure side air guide plate. The insulating pads are fixedly connected to each air guide plate and are located on the upper side of the horizontal wind baffle to support the vertical air guide plate.

[0010] Optionally, the horizontal wind baffle is divided into a high-voltage side and a low-voltage side along the long central axis of the transformer body. A ventilation opening is provided in the middle of the horizontal wind baffle, and three high-voltage cable holes are provided in the high-voltage side.

[0011] Optionally, a fixing plate is fixedly connected to the exhaust fan, and a round hole is opened on the top of the fixing plate. A dustproof net is fixedly connected to the outside of the round hole by bolts. Filter screens are fixedly connected to the inner wall of the dry transformer housing by bolts, and the filter screens cover the air inlet.

[0012] Optionally, both the horizontal windbreak and the vertical wind guide are made of insulating material.

[0013] In practical use, the horizontal baffle isolates the lower space where the dry-type transformer body is located from the upper outlet space, while the vertical air guide plate constrains the space outside the high-voltage coil, forming a clear vertical air duct. This prevents the cold air entering from the air inlet at the bottom of the casing from directly short-circuiting to the top from the empty area on the side of the casing. Instead, it is forcibly guided and must flow through the vertical heat dissipation air duct formed by the coil and the iron core itself, as well as the ventilation air duct between the vertical air guide plate and the coil. When the cold air flows through the surface of the coil and the iron core, which generate the most heat, it undergoes sufficient heat exchange, absorbs a large amount of heat, and the air temperature rises rapidly. The heated air rises and gathers in the space above the horizontal baffle through the opening above the vertical air guide plate. At this time, the exhaust fan located at the top of the casing starts, generating a strong suction force, which quickly and centrally discharges the gathered hot air from the dry-type transformer casing through the air outlet.

[0014] Throughout the process, the filter at the air inlet effectively filters the intake cooling air, while the dustproof screen at the exhaust fan outlet prevents foreign objects from entering when the machine is stopped, ensuring the cleanliness of the core area inside the transformer.

[0015] According to one embodiment of this disclosure, a forced and precisely guided heat dissipation air duct is constructed by a "vertical air guide plate" and a "horizontal air baffle," solving the problems of chaotic airflow, cold air short-circuiting, and hot air stagnation inside traditional dry-type transformers with casings. It forces all cold air entering from the bottom to flow through the vertical heat dissipation air duct of the coils and core where the heat generation is most severe, and to undergo sufficient heat exchange with the heat source before being discharged by the top fan; The horizontal baffle clearly divides the interior of the casing into upper and lower areas, effectively preventing the mixing of hot and cold air and avoiding the "short circuit" phenomenon where cold air rushes directly from the side to the top without heat exchange. Attached Figure Description

[0016] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the main view assembly structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the internal structure of the dry-type transformer housing of this utility model.

[0019] Figure 3 For the present utility model Figure 1 Rear view structural diagram.

[0020] Figure 4 This is a schematic diagram of the exhaust fan structure of this utility model.

[0021] Figure 5 This is a schematic diagram of the planar structure of this utility model.

[0022] Figure 6 This is a schematic diagram of the assembly structure of the vertical wind guide enclosure of this utility model.

[0023] Figure 7 This is a schematic diagram of the horizontal air guide plate structure of this utility model.

[0024] Figure 8 This is a top view of the dry-type transformer body of this utility model.

[0025] In the diagram: 1. Dry-type transformer casing; 2. Exhaust fan; 3. Air outlet; 4. Dry-type transformer body; 5. Horizontal wind baffle; 6. Vertical air guide plate; 7. Air inlet; 8. Dustproof net; 9. High-voltage side air guide plate; 10. Side air guide plate; 11. Low-voltage side air guide plate; 12. Fixing hole; 13. Filter screen; 14. Insulating pad; 15. Ventilation opening; 16. High-voltage cable hole; 17. Fixing plate. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figures 1 to 8 As shown, a heat dissipation structure for a dry-type transformer with a casing includes a transformer casing 1, a transformer body 4, an exhaust fan 2, a vertical air guide plate 6, and a horizontal wind baffle 5.

[0028] like Figures 1 to 8 As shown, the dry transformer housing 1 serves as an overall protective structure. It is equipped with a door, and multiple air inlets 7 are evenly distributed around the lower part and at the bottom of the door. An air outlet 3 is provided at the top, and an exhaust fan 2 is installed on the air outlet 3 to actively extract hot air. An observation window 18 is also provided above the door. Secondly, to ensure the long-term stable operation of the equipment in a dusty environment, filters 13 are fixedly connected to the inner wall of the dry transformer housing 1 and the inner wall of the door by bolts. The filters 13 cover all the air inlets 7, effectively preventing dust and foreign objects from entering. At the same time, a dustproof net 8 is fixedly installed at the outlet of the exhaust fan 2 by fixing plate 17 and bolts to prevent external dust from flowing back and foreign objects from falling in.

[0029] It should be noted that the dry-type transformer body 4, i.e. the transformer core (including iron core, high-voltage coil, low-voltage coil, etc.), is fixedly installed in the center of the dry-type transformer housing 1 in a conventional manner.

[0030] Furthermore, the vertical air guide plate 6 is made of insulating material (such as epoxy resin board), which has certain mechanical strength and insulation performance. The vertical air guide plate 6 is assembled from three high-voltage side air guide plates 9, two side air guide plates 10 and three low-voltage side air guide plates 11. Fixing holes 12 are opened on the vertical edges of these air guide plates. During assembly, heat-resistant insulating cable ties (such as fiberglass cable ties) are passed through these fixing holes 12 and fastened, thereby forming a fence structure surrounding the three-phase high-voltage coil of the dry transformer body 4. An appropriate space is maintained between the plate and the outside of the high-voltage coil, which not only ensures the electrical safety distance, but also forms a key vertical ventilation channel.

[0031] To facilitate the lead-out and adjustment of the high-voltage coil tap, a square hole is made in the straight section on the front of the high-voltage side air guide plate 9.

[0032] To ensure airflow and prevent air leakage, the straight section on the front must be in close contact with the straight section of the high-voltage coil during installation.

[0033] To enhance the structural stability of the vertical air guide plate 6, insulating pads 14 are bonded and fixed to the upper outer sides of the high-pressure side air guide plate 9, the side air guide plate 10, and the low-pressure side air guide plate 11 using high-strength casting adhesive.

[0034] like Figures 1 to 8 As shown, the horizontal windbreak 5 is also made of insulating material and is installed on the upper side of the three-phase coil of the dry transformer and on the lower side of the transformer clamp.

[0035] To facilitate on-site installation, the horizontal wind baffle 5 is designed to be divided into two parts, a high-voltage side and a low-voltage side, along the long central axis of the dry transformer body 4, with a splicing seam in the middle. A large ventilation opening 15 is opened in the middle of the horizontal wind baffle 5 for hot air to gather and rise. On the high-voltage side, three high-voltage wire holes 16 are also opened for the passage of high-voltage leads.

[0036] Furthermore, the assembled vertical wind guide plate 6 is placed and fixed in its designed position, and the insulating pad 14 at its bottom rests on the predetermined support surface. Then, the high-voltage side and low-voltage side of the horizontal wind baffle 5 are installed in place respectively. Their inner edges are located at the splicing seam, and their outer edges are fixed and sealed to the pre-welded boss inside the dry transformer housing 1 by bolts. The upper edge of the vertical wind guide plate 6 is pressed under the horizontal wind baffle 5 and is supported from above by the insulating pad 14, thus being firmly fixed. The installation of the horizontal wind baffle 5 successfully divides the internal space of the dry transformer housing 1 into two parts, leaving only the area inside the vertical wind guide plate 6 that is vertically continuous.

[0037] Ultimately, the vertical air guide plate 6, the horizontal wind baffle plate 5, and the dry transformer casing 1 together form a forced-guided heat dissipation duct.

[0038] However, as is well known to those skilled in the art, the working principle and wiring method of the dry transformer body 4 are commonplace and are all conventional means or common knowledge. Therefore, they will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0039] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A heat dissipation structure for a dry-type transformer with a casing, comprising a transformer casing (1), a transformer body (4), and an exhaust fan (2), wherein the transformer casing (1) is provided with a door, the door is provided with an observation window (18), the transformer body (4) is fixedly installed inside the transformer casing (1), air inlets (7) are provided around the lower part of the transformer casing (1) and at the bottom of the door, and an air outlet (3) is provided at the top of the transformer casing (1), and the exhaust fan (2) is disposed on the air outlet (3); characterized in that: It also includes a vertical wind deflector (6) and a horizontal wind deflector (5); The vertical air guide plate (6) is arranged around the outside of the three-phase high-voltage coil of the dry transformer body (4), and a ventilation duct is maintained between it and the outside of the high-voltage coil. The horizontal windbreak (5) is installed on the upper side of the three-phase coil of the dry transformer and on the lower side of the upper clamp. The vertical wind guide plate (6) is fixedly connected to the horizontal wind baffle plate (5). The dry transformer housing (1) is provided with a boss. The horizontal wind baffle plate (5) and the boss of the dry transformer housing (1) are fixed and sealed by bolts, so that the lower space of the horizontal wind baffle plate (5) is isolated from the upper space. The internal area of ​​the vertical wind guide panel (6) is an opening that runs through both the top and bottom; The vertical wind guide plate (6), the horizontal wind baffle plate (5), and the dry transformer shell (1) together form a heat dissipation air duct.

2. The heat dissipation structure of a dry-type transformer with a casing according to claim 1, characterized in that: The vertical air guide plate (6) is composed of three high-pressure side air guide plates (9), two side air guide plates (10) and three low-pressure side air guide plates (11). The vertical edges of the high-pressure side air guide plates (9), side air guide plates (10) and low-pressure side air guide plates (11) are all provided with fixing holes (12). The high-pressure side air guide plates (9), side air guide plates (10) and low-pressure side air guide plates (11) are fastened and formed by fixing holes (12) and heat-resistant insulating cable ties.

3. The heat dissipation structure of a dry-type transformer with a casing according to claim 2, characterized in that: The front straight section of the high-voltage side air guide plate (9) is provided with square holes to facilitate the installation and adjustment of the high-voltage coil tap. The front straight section is installed close to the straight section of the high-voltage coil.

4. The heat dissipation structure of a dry-type transformer with a casing according to claim 2, characterized in that: Insulating pads (14) are provided on the upper outer sides of the high-pressure side air guide plate (9), the side air guide plate (10) and the low-pressure side air guide plate (11). The insulating pads (14) are fixedly connected to each air guide plate. The insulating pads (14) are located on the upper side of the horizontal wind baffle plate (5) and provide support for the vertical air guide plate (6).

5. The heat dissipation structure of a dry-type transformer with a casing according to claim 1, characterized in that: The horizontal wind baffle (5) is divided into two parts, a high-voltage side and a low-voltage side, along the long central axis of the dry transformer body (4). A ventilation opening (15) is provided in the middle of the horizontal wind baffle (5), and three high-voltage wire holes (16) are provided in the high-voltage side.

6. The heat dissipation structure of a dry-type transformer with a casing according to claim 1, characterized in that: A fixed plate (17) is fixedly connected to the exhaust fan (2). A round hole is opened on the top of the fixed plate (17). A dustproof net (8) is fixedly connected to the outside of the round hole by bolts. A filter screen (13) is fixedly connected to the inner wall of the dry transformer housing (1) by bolts. The filter screen (13) covers the air inlet (7).

7. The heat dissipation structure of a dry-type transformer with a casing according to claim 1, characterized in that: Both the horizontal windbreak (5) and the vertical wind guide (6) are made of insulating material.

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