Anti-deflagration device for transformer

Abstract

The utility model relates to the technical field of transformers, and discloses a transformer anti-deflagration device which is applied to an oil tank of a transformer, the tank wall of the oil tank is provided with an opening, and the oil tank comprises an anti-explosion film and a corrugated pipe. The explosion-proof membrane is installed on the outer wall of the oil tank and surrounds the opening. The corrugated pipe is installed on the outer wall of the oil tank and surrounds the explosion-proof membrane. And a first closed space is formed between the explosion-proof membrane and the corrugated pipe. When the internal pressure is too large and the pressure relief capacity of the pressure relief valve is insufficient due to major faults such as short circuit in the transformer, the explosion-proof membrane can be broken. And then the transformer oil can be leaked into the first closed space through the opening and the broken explosion-proof membrane, so that the pressure relief effect is achieved, and explosion of the transformer is avoided. And moreover, the corrugated pipe can prevent leaked transformer oil from being in contact with oxygen in the atmosphere, so that fire is avoided, and the transformer is protected from being burnt and exploded.

Description

Technical Field

[0001] This application relates to the field of transformer technology, and in particular to a transformer explosion-proof device. Background Technology

[0002] Currently, transformers only have pressure relief valves as pressure relief devices to release normal abnormal pressure in the transformer tank. However, the pressure relief valve's pressure relief capacity is insufficient, typically only discharging about 5 liters of oil. When a transformer experiences a major fault such as an internal short circuit, the pressure generated inside the transformer requires a very large amount of oil to be discharged. In such cases, the insufficient pressure relief capacity of the pressure relief valve often causes the transformer tank to explode and rupture, leading to oil leakage and transformer deflagration. Related technology (publication number: CN118800557A) discloses an explosion-proof diaphragm type pressure relief device, including a knife gate valve, a first explosion-proof diaphragm, a second explosion-proof diaphragm, a multi-layer bellows, and a fifth flange. The sealing surface of the knife gate valve is circular, with a first flange and a second flange at both ends. The upper end is connected to a matching bushing riser via the first flange, and the lower end is connected to a third flange of the multi-layer bellows via the second flange, used to clamp the first explosion-proof diaphragm and its first upper and lower clamping platforms. The fourth and fifth flanges of the multi-layer corrugated pipe are connected to clamp the second explosion-proof membrane and its second upper and lower clamping platforms. The multi-layer corrugated pipe, together with the first and second explosion-proof membranes, constitute a decompression chamber.

[0003] In the process of implementing the technical solution disclosed herein, at least the following problems were found in the related technologies:

[0004] This explosion-proof diaphragm-type pressure relief device creates a sealed space within the decompression chamber by installing a first and a second explosion-proof diaphragm on both sides. After inert gas is introduced, if either the first or second explosion-proof diaphragm ruptures, high-pressure oil and gas enter the decompression chamber. The inert gas within the chamber then enters the high-pressure oil tank, preventing potential combustion or explosion. However, because the inert gas enters the high-pressure oil tank, the pressure inside the tank does not change significantly. Explosion can still easily occur if the pressure is too high and the pressure relief valve's capacity is insufficient.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] To provide a basic understanding of some aspects of the disclosed technical solutions, a brief summary is given below. This summary is not a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these technical solutions, but rather serves as an introduction to the detailed explanations that follow.

[0007] This disclosure provides a transformer explosion-proof device to solve the problems mentioned in the background art.

[0008] In some technical solutions, the aforementioned transformer explosion-proof device is applied to the oil tank of a transformer. The tank wall has an opening and includes: an explosion-proof membrane installed on the outer wall of the oil tank and surrounding the opening; and a corrugated pipe installed on the outer wall of the oil tank and surrounding the explosion-proof membrane; wherein a first sealed space is formed between the explosion-proof membrane and the corrugated pipe.

[0009] Optionally, the corrugated pipe includes: a pipe body, one end of which is sealed and the other end is open; a first flange connected to the open end of the pipe body; wherein the first flange is detachably installed on the outer wall of the oil tank.

[0010] Optionally, it further includes: a cover, installed on the first flange and surrounding the pipe body; wherein a second sealed space is formed between the pipe body and the cover.

[0011] Optionally, it further includes: a second flange, connected to the outer wall of the oil tank and surrounding the opening; wherein the first flange is installed on the second flange.

[0012] Optionally, it further includes: a first bolt, which passes through the cover and the first flange and is threaded to the second flange.

[0013] Optionally, it further includes: a first sealing ring installed at the contact point between the first flange and the cover; wherein the first flange includes a first annular groove on its end face, the first sealing ring is located inside the first annular groove and fits against the cover.

[0014] Optionally, it further includes: a second sealing ring installed at the contact point between the second flange and the first flange; wherein the second flange includes a second annular groove located on its end face, the second sealing ring is located inside the second annular groove and fits against the first flange.

[0015] Optionally, it further includes: a third flange connected to the outer wall of the tank and surrounding the opening; a fourth flange opposite to the third flange, with the explosion-proof membrane clamped between the fourth flange and the third flange; and a second bolt passing through the fourth flange and the explosion-proof membrane and threadedly connected to the third flange.

[0016] Optionally, it further includes: a third sealing ring, installed at the contact point between the third flange and the fourth flange; wherein the third flange includes a third annular groove located on its end face, the third sealing ring is located inside the third annular groove and fits against the fourth flange.

[0017] The transformer explosion-proof device provided in this disclosure can achieve the following technical effects:

[0018] This disclosure provides a transformer explosion-proof device applied to the transformer tank. The tank wall has an opening and includes an explosion-proof membrane and a bellows. The explosion-proof membrane is installed on the outer wall of the tank, surrounding the opening. The bellows is also installed on the outer wall of the tank, surrounding the explosion-proof membrane. A first sealed space is formed between the explosion-proof membrane and the bellows. When a major fault such as a short circuit occurs inside the transformer, causing excessive internal pressure and insufficient pressure relief valve capacity, the explosion-proof membrane will rupture. Transformer oil can then leak through the opening and the ruptured explosion-proof membrane into the first sealed space, thereby relieving pressure and preventing a transformer explosion. Furthermore, the bellows prevents the leaked transformer oil from contacting oxygen in the atmosphere, thus preventing fire and protecting the transformer from combustion and explosion.

[0019] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0021] Figure 1 This is a cross-sectional structural schematic diagram of a transformer explosion-proof device provided in an embodiment of this disclosure;

[0022] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0023] Figure 3 yes Figure 1 Enlarged structural diagram at point B;

[0024] Figure 4 yes Figure 1 A schematic diagram of the cross-sectional structure at the CC section;

[0025] Figure 5 This is a top view of a transformer explosion-proof device provided in an embodiment of this disclosure;

[0026] Figure label:

[0027] 10: Oil tank; 20: Explosion-proof membrane; 30: Bellows; 31: Pipe body; 32: First flange; 40: Cover; 50: Second flange; 60: First bolt; 70: First sealing ring; 80: Second sealing ring; 90: Third flange; 100: Fourth flange; 110: Second bolt; 120: Third sealing ring. Detailed Implementation

[0028] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0029] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0030] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better describing the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this disclosure according to the specific circumstances.

[0031] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0032] Unless otherwise stated, the term "multiple" means two or more.

[0033] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0034] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0036] Combination Figures 1 to 5 As shown, this embodiment of the present disclosure provides a transformer explosion-proof device applied to the oil tank 10 of a transformer. The tank 10 has an opening in its wall and includes an explosion-proof membrane 20 and a corrugated pipe 30. The explosion-proof membrane 20 is installed on the outer wall of the oil tank 10 and surrounds the opening. The corrugated pipe 30 is installed on the outer wall of the oil tank 10 and surrounds the explosion-proof membrane 20. A first sealed space is formed between the explosion-proof membrane 20 and the corrugated pipe 30.

[0037] This disclosure provides a transformer explosion-proof device in which a first sealed space is formed between the explosion-proof membrane 20 and the bellows 30. When a major fault such as a short circuit occurs inside the transformer, causing excessive internal pressure and insufficient pressure relief valve capacity, the explosion-proof membrane 20 will rupture. Transformer oil can then leak into the first sealed space through the opening and the ruptured explosion-proof membrane 20, thereby relieving pressure and preventing a transformer explosion. Furthermore, the bellows 30 prevents the leaked transformer oil from contacting oxygen in the atmosphere, thus preventing fire and protecting the transformer from combustion and explosion.

[0038] Optionally, combined Figure 1 , Figure 2 and Figure 4 As shown, the bellows 30 includes a pipe body 31 and a first flange 32. One end of the pipe body 31 is sealed, and the other end is open. The first flange 32 is connected to the open end of the pipe body 31. The first flange 32 is detachably mounted on the outer wall of the oil tank 10.

[0039] In this embodiment, the bellows 30 comprises a pipe body 31 and a first flange 32 connected to the pipe body 31. The pipe body 31 is designed to be sealed at one end and open at the other, allowing transformer oil to enter the interior of the pipe body 31 through the open end and be blocked and stored inside the pipe body 31 by the sealed end. Furthermore, the design of the first flange 32 being detachably installed on the outer wall of the oil tank 10 facilitates the installation and removal of the bellows 30.

[0040] Optionally, combined Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, it also includes a cover 40. The cover 40 is installed on the first flange 32 and surrounds the pipe body 31. A second sealed space is formed between the pipe body 31 and the cover 40.

[0041] In this embodiment, a second sealed space is formed between the pipe body 31 and the cover 40, which is used to accommodate the expandable bellows 30. When the explosion-proof membrane 20 ruptures, transformer oil leaks into the first sealed space through the opening and the ruptured explosion-proof membrane 20, causing the bellows 30 to expand. At this time, the cover 40 prevents damage to the bellows 30. Simultaneously, it prevents the transformer oil from contacting oxygen in the atmosphere after the bellows 30 is damaged, thus preventing fire and protecting the transformer from combustion and explosion.

[0042] Optionally, combined Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, it also includes a second flange 50. The second flange 50 is connected to the outer wall of the oil tank 10 and surrounds the opening. The first flange 32 is installed on the second flange 50.

[0043] In this embodiment, a second flange 50 is also included, connected to the outer wall of the oil tank 10 and surrounding the opening. The second flange 50 is used to support the installation of the first flange 32 to facilitate the installation or removal of the bellows 30.

[0044] Optionally, combined Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, it also includes a first bolt 60. The first bolt 60 passes through the cover 40 and the first flange 32, and is threaded to the second flange 50.

[0045] In this embodiment, a first bolt 60 is further included, which passes through the cover 40 and the first flange 32 and is threaded to the second flange 50. The cover 40 and the bellows 30 are fixed to the first flange 32 by the first bolt 60. Furthermore, using bolts as connecting parts has the advantages of stable connection and easy disassembly.

[0046] Optionally, combined Figure 1 and Figure 2 As shown, it also includes a first sealing ring 70. The first sealing ring 70 is installed at the contact point between the first flange 32 and the cover 40. The first flange 32 includes a first annular groove on its end face, and the first sealing ring 70 is located inside the first annular groove and fits against the cover 40.

[0047] In this embodiment, a first sealing ring 70 is further included at the contact point between the first flange 32 and the cover 40. The first sealing ring 70 serves to seal and prevent leakage at the contact point between the first flange 32 and the cover 40. Furthermore, the first annular groove of the first flange 32 serves as a limiting feature to facilitate the installation of the first sealing ring 70.

[0048] Optionally, combined Figure 1 and Figure 2 As shown, it also includes a second sealing ring 80. The second sealing ring 80 is installed at the contact point between the second flange 50 and the first flange 32. The second flange 50 includes a second annular groove on its end face, and the second sealing ring 80 is located inside the second annular groove and fits against the first flange 32.

[0049] In this embodiment, a second sealing ring 80 is further included at the contact point between the second flange 50 and the first flange 32. The second sealing ring 80 serves to seal and prevent leakage at the contact point between the second flange 50 and the first flange 32. Furthermore, the second annular groove of the second flange 50 serves as a limiting feature to facilitate the installation of the second sealing ring 80.

[0050] Optionally, combined Figure 1 , Figure 3 and Figure 4 As shown, the tank also includes a third flange 90, a fourth flange 100, and a second bolt 110. The third flange 90 is connected to the outer wall of the tank 10 and surrounds the opening, for connection with the second bolt 110 to prevent the second bolt 110 from being directly connected to the tank wall of the tank 10. The fourth flange 100 is opposite to the third flange 90, and the explosion-proof membrane 20 is clamped between the fourth flange 100 and the third flange 90 to press the explosion-proof membrane 20. The second bolt 110 passes through the fourth flange 100 and the explosion-proof membrane 20 and is threaded to the third flange 90, serving as a connecting piece.

[0051] In this embodiment, tightening the second bolt 110 gradually pushes the fourth flange 100 toward the third flange 90 through the interaction between the threads, thereby clamping the explosion-proof membrane 20. Furthermore, using bolts as connectors offers advantages such as stable connection and ease of disassembly.

[0052] Optionally, combined Figure 1 and Figure 3 As shown, it also includes a third sealing ring 120. The third sealing ring 120 is installed at the contact point between the third flange 90 and the fourth flange 100. The third flange 90 includes a third annular groove on its end face, and the third sealing ring 120 is located inside the third annular groove and fits against the fourth flange 100.

[0053] In this embodiment, a third sealing ring 120 is further included at the contact point between the third flange 90 and the fourth flange 100. The third sealing ring 120 serves to seal and prevent leakage at the contact point between the third flange 90 and the fourth flange 100. Furthermore, the third annular groove of the third flange 90 can act as a limiting feature to facilitate the installation of the third sealing ring 120.

[0054] The foregoing description and accompanying drawings have fully illustrated embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of this disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A transformer explosion-preventing device applied to an oil tank of a transformer, an opening being provided in a tank wall of the oil tank, characterized in that, The application relates to an explosion-proof oil tank. The application comprises: An explosion-proof membrane is installed on the outer wall of the oil tank and surrounds the opening; A corrugated pipe is installed on the outer wall of the oil tank and surrounds the explosion-proof membrane; 2. A transformer deflagration-proof device according to claim 1, characterized in that A first sealed space is formed between the explosion-proof membrane and the corrugated pipe. The corrugated pipe comprises: A pipe body, one end of which is sealed and the other end of which is open; A first flange is connected to the open end of the pipe body; 3. A transformer deflagration-proof device according to claim 2, characterized in that The first flange is detachably installed on the outer wall of the oil tank. The application further comprises: A cover body is installed on the first flange and surrounds the pipe body; 4. A device for preventing an explosion of a transformer according to claim 3, wherein A second sealed space is formed between the pipe body and the cover body. The application further comprises: A second flange is connected to the outer wall of the oil tank and surrounds the opening; 5. A device for preventing an explosion of a transformer according to claim 4, wherein The first flange is installed on the second flange. The application further comprises:

6. A transformer explosion-proof device according to claim 3, characterized in that A first bolt is arranged through the cover body and the first flange and is screwed to the second flange. The application further comprises: A first sealing ring is installed at the contact position of the first flange and the cover body; 7. A transformer explosion-proof device according to claim 4, characterized in that The first flange comprises a first annular groove on the end face, the first sealing ring is arranged inside the first annular groove and is in contact with the cover body. The application further comprises: A second sealing ring is installed at the contact position of the second flange and the first flange; 8. An apparatus for preventing an explosion of a transformer according to any one of claims 1 to 7, characterized in that, The second flange comprises a second annular groove on the end face, the second sealing ring is arranged inside the second annular groove and is in contact with the first flange. The application further comprises: A third flange is connected to the outer wall of the oil tank and surrounds the opening; A fourth flange is opposite to the third flange, the explosion-proof membrane is clamped between the fourth flange and the third flange; 9. A device for preventing an explosion of a transformer according to claim 8, characterized in that A second bolt is arranged through the fourth flange and the explosion-proof membrane and is screwed to the third flange. The application further comprises: A third sealing ring is installed at the contact position of the third flange and the fourth flange; The third flange comprises a third annular groove on the end face, the third sealing ring is arranged inside the third annular groove and is in contact with the fourth flange.

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