A submersible dry-type transformer

Abstract

This invention discloses a water-immersible dry-type transformer, comprising a sealed and waterproof heat dissipation outer shell, an inner shell, a dry-type transformer body, and an air supply system. The heat dissipation outer shell has an internal receiving cavity; the inner shell has an internal mounting cavity, and the inner shell is disposed within the receiving cavity. A heat exchange space is formed between the outer periphery of the inner shell and the inner wall of the receiving cavity. The inner shell has a first connecting hole and a second connecting hole, both of which communicate with the heat exchange space and the mounting cavity. The dry-type transformer body is mounted in the mounting cavity. The air supply system is disposed inside the heat dissipation outer shell and is used to drive air from the mounting cavity into the heat exchange space through the first connecting hole and to drive air from the heat exchange space into the mounting cavity through the second connecting hole. The dry-type transformer provided by this invention achieves waterproofing through an improved cooling and heat dissipation method, enabling the dry-type transformer to operate normally in a water-immersed environment.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a water-immersable dry-type transformer. Background Technology

[0002] Substations in low-lying areas may be flooded during heavy rain. Existing dry-type transformers often use forced air cooling systems that directly draw in outside air. This cooling method requires the inside of the dry-type transformer to be connected to the outside. When such dry-type transformers are submerged in floodwater, they are prone to insulation failure and electrical faults, making them unable to work properly. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a water-immersable dry-type transformer that achieves waterproofing by improving the cooling and heat dissipation method, enabling the dry-type transformer to operate normally in a water-immersion environment.

[0004] According to an embodiment of the present invention, a water-immersible dry-type transformer includes a sealed and waterproof heat dissipation outer shell, an inner shell, a dry-type transformer body, and an air supply system. The heat dissipation outer shell has an internal receiving cavity; the inner shell has an internal mounting cavity, and the inner shell is disposed within the receiving cavity. A heat exchange space is formed between the outer periphery of the inner shell and the inner wall of the receiving cavity. The inner shell has a first connecting hole and a second connecting hole, both of which communicate with the heat exchange space and the mounting cavity. The dry-type transformer body is mounted in the mounting cavity. The air supply system is disposed inside the heat dissipation outer shell and is used to drive air from the mounting cavity into the heat exchange space through the first connecting hole and to drive air from the heat exchange space into the mounting cavity through the second connecting hole.

[0005] The water-immersable dry-type transformer according to embodiments of the present invention has at least the following beneficial effects: The dry-type transformer provided by the present invention, by setting a double shell structure of a heat dissipation outer shell and an inner shell on the outside of the dry-type transformer body, and forming a heat exchange space between the heat dissipation outer shell and the inner shell, and using an air supply system to realize the air flow circulation between the heat exchange space and the dry-type transformer body, improves the heat dissipation method of drawing outside air for heat exchange to a heat dissipation method of heat dissipation from the heat dissipation outer shell to the outside and internal air flow circulation for heat exchange. Thus, it can not only realize the heat dissipation and cooling of the dry-type transformer body, but also avoid the air flow between the inside of the dry-type transformer and the outside, achieving a waterproof effect, thereby enabling the dry-type transformer to operate normally in a water immersion environment.

[0006] According to some embodiments of the present invention, the heat dissipation housing is provided with coolant flow channels in the cavity wall of the receiving cavity.

[0007] According to some embodiments of the present invention, a first storage tank is installed on the heat dissipation housing, the first storage tank is located outside the receiving cavity, and the first storage tank is in communication with the coolant flow channel.

[0008] According to some embodiments of the present invention, the heat dissipation housing includes a base, a top cover, and a heat dissipation frame. The lower end of the heat dissipation frame is connected to and sealed to the base, the top cover is connected to and sealed to the upper end of the heat dissipation frame, the receiving cavity is formed by the base, the top cover, and the heat dissipation frame, and the coolant flow channel is disposed in the heat dissipation frame.

[0009] According to some embodiments of the present invention, the heat dissipation frame includes four heat dissipation plates arranged in a rectangular shape and connected end to end in a sealed manner. Each heat dissipation plate is provided with a coolant flow channel, and a heat exchange space is formed between each heat dissipation plate and the inner shell.

[0010] According to some embodiments of the present invention, a second storage tank is installed on the heat dissipation housing, the second storage tank is located outside the receiving cavity, and the second storage tank communicates with the mounting cavity.

[0011] According to some embodiments of the present invention, the air supply system includes a first fan and a second fan, wherein the first fan is disposed corresponding to the first connecting hole and the second fan is disposed corresponding to the second connecting hole.

[0012] According to some embodiments of the present invention, the heat dissipation housing is provided with a labyrinth heat exchange structure protruding toward the heat exchange space to form a labyrinth flow channel in the heat exchange space.

[0013] According to some embodiments of the present invention, the labyrinth heat exchange structure includes multiple heat sinks arranged side by side, with adjacent heat sinks forming a flow channel at intervals, and at least one notch communicating with the flow channel is provided on the heat sink, with the notches on adjacent heat sinks being staggered.

[0014] According to some embodiments of the present invention, the length direction of the heat sink is inclined relative to the vertical direction, the first connecting hole is disposed at the upper end of the inner shell, and the second connecting hole is disposed at the lower end of the inner shell, wherein the first connecting hole and the second connecting hole corresponding to the same labyrinth heat exchange structure are arranged at intervals along a first direction, and the first direction intersects the inclination direction of the heat sink.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the basic structure of a water-immersable dry-type transformer according to an embodiment of the present invention. Figure 2 for Figure 1 A schematic diagram of the outer casing of a water-immersible dry-type transformer is shown. Figure 3 for Figure 1 A schematic diagram of the heat sink plate of the heat sink frame of a water-immersable dry-type transformer is shown. Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0017] Figure label: Heat dissipation shell 100, base 100a, top cover 100b, heat dissipation frame 100c, receiving cavity 110, heat exchange space 111, coolant flow channel 120, heat dissipation ceramic plate 130, heat dissipation plate 140, labyrinth flow channel 140a, guide channel 141, notch 142, inner shell 200, mounting cavity 210, first connecting hole 220, second connecting hole 230, dry-type transformer body 300, air supply system, first fan 410, second fan 420, first storage tank 510, second storage tank 520, terminal block 600. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0020] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] Reference Figure 1 According to an embodiment of the present invention, a water-immersible dry-type transformer includes a sealed and waterproof heat dissipation outer shell 100, an inner shell 200, a dry-type transformer body 300, and an air supply system. The heat dissipation outer shell 100 has an internal receiving cavity 110; the inner shell 200 has an internal mounting cavity 210, and the inner shell 200 is disposed within the receiving cavity 110. A heat exchange space 111 is formed between the outer periphery of the inner shell 200 and the inner wall of the receiving cavity 110. The inner shell 200 has a first connecting hole 220 and a second connecting hole 230, both of which are connected to the heat exchange space 210. The heat exchange space 111 and the mounting cavity 210 are connected; the dry-type transformer body 300 is installed in the mounting cavity 210; the air supply system is set inside the heat dissipation shell 100. The air supply system is used to drive the air in the mounting cavity 210 into the heat exchange space 111 through the first connecting hole 220 and drive the air in the heat exchange space 111 into the mounting cavity 210 through the second connecting hole 230. The heat dissipation shell 100 can absorb the heat of the air in the heat exchange air. When it is not soaked in water, the heat dissipation shell 100 can dissipate heat to the outside air. When it is soaked in water, the heat dissipation shell 100 can dissipate heat with the water in the outside.

[0023] The dual-shell structure of the heat dissipation outer shell 100 and inner shell 200 can form a heat exchange space 111 between the heat dissipation outer shell 100 and the inner shell 200. This allows the air supply system to achieve a stable airflow circulation between the heat exchange space 111 and the mounting cavity 210, thus avoiding airflow turbulence that could affect the heat dissipation effect.

[0024] The dry-type transformer provided by this invention features a double-shell structure consisting of a heat dissipation outer shell 100 and an inner shell 200 on the outside of the main body 300 of the dry-type transformer. A heat exchange space 111 is formed between the heat dissipation outer shell 100 and the inner shell 200. At the same time, an air supply system is used to achieve air circulation between the heat exchange space 111 and the main body 300 of the dry-type transformer. This improves the heat dissipation method from drawing in outside air for heat exchange to a method in which the heat dissipation outer shell 100 dissipates heat to the outside while the internal air circulates for heat exchange. Thus, the main body 300 of the dry-type transformer can be cooled, while the air flow between the inside and outside of the dry-type transformer is avoided, achieving a waterproof effect. This allows the dry-type transformer to operate normally in a water immersion environment.

[0025] It should be noted that the dry-type transformer body 300 is a common component in this field, which typically includes an iron core and coils mounted on the iron core. The specific structure will not be described in detail here.

[0026] Reference Figure 1 According to some embodiments of the present invention, the heat dissipation housing 100 is provided with a coolant flow channel 120 in the cavity wall of the receiving cavity 110. Thus, liquid water or other liquids can be filled in the coolant flow channel 120 to enhance the heat absorption and buffering capacity of the heat dissipation housing 100. When a large amount of heat is suddenly generated in the dry-type transformer body 300, the heat that cannot be discharged in time can be temporarily buffered.

[0027] Reference Figure 1 According to some embodiments of the present invention, a first storage tank 510 is installed on the heat dissipation shell 100. The first storage tank 510 is located outside the receiving cavity 110 and is connected to the coolant flow channel 120. The coolant in the coolant flow channel 120 expands in volume after being heated. The first storage tank 510 serves as a temporary coolant storage chamber to ensure that the coolant does not leak out and that the coolant flow channel 120 is sealed and does not break.

[0028] Reference Figure 1 According to some embodiments of the present invention, the heat dissipation housing 100 includes a base 100a, a top cover 100b, and a heat dissipation frame 100c. The lower end of the heat dissipation frame 100c is connected to and sealed with the base 100a, and the top cover 100b is connected to and sealed with the upper end of the heat dissipation frame 100c. The receiving cavity 110 is formed by the base 100a, the top cover 100b, and the heat dissipation frame 100c. The coolant flow channel 120 is disposed in the heat dissipation frame 100c. For large dry-type transformers, the heat dissipation housing 100 can be divided into multiple parts, which are manufactured separately and then assembled and sealed. This can reduce the manufacturing difficulty and facilitate the installation of the inner shell 200 and the dry-type transformer body 300.

[0029] In the specific implementation process, the lower end of the heat sink frame 100c and the base 100a can be sealed by adding a sealing element, or by continuous welding, glue filling and bonding or other methods; the upper end of the top cover 100b and the heat sink frame 100c can be sealed by adding a sealing element, or by continuous welding, glue filling and bonding or other methods.

[0030] According to some embodiments of the present invention, the heat sink frame 100c includes four heat sinks arranged in a rectangular shape and connected end to end in a sealed manner. Each heat sink has a coolant flow channel 120 inside, and a heat exchange space 111 is formed between each heat sink and the inner shell 200. For large dry-type transformers, the heat sink frame 100c can be produced in multiple parts and then assembled into a whole, which can reduce the production difficulty and improve the production accuracy.

[0031] Reference Figure 1According to some embodiments of the present invention, a second storage tank 520 is installed on the heat dissipation housing 100. The second storage tank 520 is located outside the receiving cavity 110 and communicates with the mounting cavity 210. After the hot air in the mounting cavity 210 expands, the second storage tank 520 serves as a temporary storage compartment to ensure that the air in the mounting cavity 210 does not leak out and that the mounting cavity 210 is sealed and does not break.

[0032] Reference Figure 1 and Figure 2 According to some embodiments of the present invention, the air supply system includes a first fan 410 and a second fan 420. The first fan 410 is correspondingly arranged with the first connecting hole 220, and the second fan 420 is correspondingly arranged with the second connecting hole 230. Thus, the first fan 410 can be used to send hot air in the mounting cavity 210 from the first connecting hole 220 into the heat exchange space 111 for heat exchange and cooling, and the second fan 420 can be used to send the cooled air in the heat exchange space 111 back to the mounting cavity 210 from the second connecting hole 230, thereby forming an air flow circulation.

[0033] Of course, in some other embodiments, the above-described air supply system may only include a second fan 420 or a first fan 410.

[0034] Reference Figure 1 , Figure 3 and Figure 4 According to some embodiments of the present invention, the heat dissipation shell 100 is provided with a labyrinth heat exchange structure protruding toward the heat exchange space 111 to form a labyrinth flow channel 140a in the heat exchange space 111. This increases the contact area between the heat dissipation shell 100 and the air in the heat exchange space 111 and increases the time required for the air to flow through the heat exchange space 111, thereby improving the efficiency of the heat dissipation shell 100 in absorbing heat from the air in the heat exchange space 111.

[0035] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, the labyrinth heat exchange structure includes multiple heat sinks 140 arranged side by side, with adjacent heat sinks 140 forming a flow channel 141 at intervals, and at least one notch 142 communicating with the flow channel 141 on the heat sink 140. The notches 142 on adjacent heat sinks 140 are staggered, thereby forming a labyrinth flow channel 140a by communicating between the flow channel 141 between adjacent heat sinks 140 and the notch 142 on the heat sink 140.

[0036] Reference Figures 2 to 4According to some embodiments of the present invention, the length direction of the heat sink 140 is inclined relative to the vertical direction. A first connecting hole 220 is disposed at the upper end of the inner shell 200, and a second connecting hole 230 is disposed at the lower end of the inner shell 200. The first connecting hole 220 and the second connecting hole 230, corresponding to the same labyrinthine heat exchange structure, are arranged at intervals along a first direction, which intersects the inclined direction of the heat sink 140. This arrangement effectively increases the distance and time that air travels when entering and exiting the heat exchange space 111, allowing the heat sink shell 100 to absorb more heat from the air entering the heat exchange space 111, thus achieving a better heat exchange and cooling effect.

[0037] In a specific embodiment, the tilt direction of the heat sink 140 is according to Figure 3 When the orientation is set as shown, the corresponding first connecting hole 220 and second connecting hole 230 are arranged according to... Figure 2 The given embodiment arrangement is for ease of understanding. Figure 3 The inner shell 200 and its first connecting hole 220 and second connecting hole 230 are represented by dashed lines.

[0038] It is conceivable that in other embodiments, the labyrinthine heat dissipation structure described above may also be configured in other ways. For example, the labyrinthine heat dissipation structure may be formed by combining multiple L-shaped air guide plates.

[0039] Reference Figure 1 According to some embodiments of the present invention, heat dissipation ceramic fins 130 are provided on the outer wall of the heat dissipation shell 100 to improve the heat exchange efficiency between the heat dissipation shell 100 and the outside.

[0040] Reference Figure 1 In the specific implementation process, it also includes a terminal block 600, which is installed on the top of the heat dissipation housing 100. The terminal block 600 is sealed to the heat dissipation housing 100. The terminal block 600 integrates multiple sealed, waterproof and externally insulated terminals. The dry-type transformer body 300 is connected to the external power grid through the aforementioned terminals.

[0041] In some embodiments, the inner shell 200 is configured as an insulating shell, and a humidity detection alarm is provided between the inner shell 200 and the heat dissipation shell 100. When the transformer is in a water immersion environment, the humidity detection alarm detects the humidity between the inner shell 200 and the heat dissipation shell 100, thereby indirectly detecting whether the heat dissipation shell 100 has been accidentally damaged. When the heat dissipation shell 100 is accidentally damaged, causing water vapor to enter the interior and increase the humidity, an alarm is triggered, allowing the staff to shut down the transformer in time.

[0042] In some embodiments, an automatic circuit breaker is installed between the terminal block 600 and the dry-type transformer body 300, and a humidity detection alarm device is used to trigger the automatic circuit breaker to trip and disconnect power. When the transformer is in a water-immersed environment, if the humidity detection alarm device detects that the humidity between the inner shell 200 and the heat dissipation shell 100 is too high, it indirectly indicates that the heat dissipation shell 100 has been accidentally damaged. At this time, the humidity detection alarm device issues an alarm message to remind the staff of the water leakage. At the same time, the humidity detection alarm device triggers the automatic circuit breaker to disconnect the electrical connection between the terminal block 600 and the dry-type transformer body 300, thereby causing the transformer to automatically shut down.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A water-immersible dry-type transformer, characterized in that, include: A sealed and waterproof heat dissipation housing (100) is provided with a receiving cavity (110) inside the heat dissipation housing (100). The inner shell (200) has an installation cavity (210) inside it. The inner shell (200) is disposed in the receiving cavity (110). A heat exchange space (111) is formed between the outer periphery of the inner shell (200) and the inner wall of the receiving cavity (110). The inner shell (200) is provided with a first connecting hole (220) and a second connecting hole (230). Both the first connecting hole (220) and the second connecting hole (230) are connected to the heat exchange space (111) and the installation cavity (210). The dry-type transformer body (300) is installed in the mounting cavity (210); An air supply system is provided inside the heat dissipation housing (100). The air supply system is used to drive the air in the mounting cavity (210) into the heat exchange space (111) through the first connecting hole (220) and to drive the air in the heat exchange space (111) into the mounting cavity (210) through the second connecting hole (230). The heat dissipation housing (100) has a coolant flow channel (120) provided on the cavity wall of the receiving cavity (110). The heat dissipation housing (100) includes a base (100a), a top cover (100b), and a heat dissipation frame (100c). The lower end of the heat dissipation frame (100c) is connected to and sealed with the base (100a). The top cover (100b) is connected to and sealed with the upper end of the heat dissipation frame (100c). The receiving cavity (110) is formed by the base (100a), the top cover (100b), and the heat dissipation frame (100c). The coolant flow channel (120) is disposed in the heat dissipation frame (100c). The heat dissipation frame (100c) includes four heat dissipation plates arranged in a rectangular shape and connected end to end in a sealed manner. Each heat dissipation plate is provided with a coolant flow channel (120), and a heat exchange space (111) is formed between each heat dissipation plate and the inner shell (200).

2. The water-immersable dry-type transformer according to claim 1, characterized in that, A first storage tank (510) is installed on the heat dissipation shell (100). The first storage tank (510) is located outside the receiving cavity (110) and is connected to the coolant flow channel (120).

3. A water-immersible dry-type transformer according to claim 1, characterized in that, A second storage tank (520) is installed on the heat dissipation shell (100). The second storage tank (520) is located outside the receiving cavity (110) and is in communication with the mounting cavity (210).

4. A water-immersible dry-type transformer according to claim 1, characterized in that, The air supply system includes a first fan (410) and a second fan (420), wherein the first fan (410) is correspondingly arranged with the first connecting hole (220), and the second fan (420) is correspondingly arranged with the second connecting hole (230).

5. A water-immersible dry-type transformer according to claim 1, characterized in that, The heat dissipation shell (100) protrudes toward the heat exchange space (111) and is provided with a labyrinth heat exchange structure to form a labyrinth flow channel (140a) in the heat exchange space (111).

6. A water-immersible dry-type transformer according to claim 5, characterized in that, The labyrinth heat exchange structure includes multiple heat sinks (140) arranged side by side. Adjacent heat sinks (140) form a flow channel (141) at intervals. Each heat sink (140) has at least one notch (142) that communicates with the flow channel (141). The notches (142) on adjacent heat sinks (140) are staggered.

7. A water-immersible dry-type transformer according to claim 6, characterized in that, The length direction of the heat sink (140) is inclined relative to the vertical direction. The first connecting hole (220) is disposed at the upper end of the inner shell (200), and the second connecting hole (230) is disposed at the lower end of the inner shell (200). The first connecting hole (220) and the second connecting hole (230) corresponding to the same labyrinth heat exchange structure are arranged at intervals along a first direction, which intersects the inclination direction of the heat sink (140).

Images