CN113410025B

CN113410025B - Oil-immersed transformer with explosion-proof protection architecture

Info

Publication number: CN113410025B
Application number: CN202110643853.7A
Authority: CN
Inventors: 董刚; 朱从一; 蔡利
Original assignee: Jiangsu Yuecheng Transformer Co ltd
Current assignee: Xuzhou Jialian Agriculture Development Co ltd
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2022-03-04
Anticipated expiration: 2041-06-09
Also published as: CN113410025A; CN114464398A

Abstract

The invention discloses an oil-immersed transformer with an explosion-proof protection structure, which belongs to the field of oil-immersed transformers, and can realize that when a main body of the oil-immersed transformer works for a long time and transformer oil in the main body of the oil-immersed transformer is in a high-temperature and high-pressure state, the pressure of the transformer oil can be concentrated at a connecting part between the main body of the oil-immersed transformer and an explosion-proof protection pot, a movable sealing plug is damaged, and the high-pressure transformer oil is discharged into the protection pot to ensure the safety of the oil pressure in the main body of the oil-immersed transformer, thereby protecting the oil-immersed transformer and preventing the high-pressure explosion accident from occurring, preventing the whole explosion of the transformer by controlling the pressure release point of the transformer oil in the oil-immersed transformer under the high temperature and the high pressure, preventing the splashing of the transformer oil along with the explosion of the transformer and preventing the injury to human body from occurring, it is not easy to induce fire and cause serious casualties.

Description

Oil-immersed transformer with explosion-proof protection architecture

Technical Field

The invention relates to the field of oil-immersed transformers, in particular to an oil-immersed transformer with an explosion-proof protection structure.

Background

The oil-immersed transformer is a transformer using petroleum liquid as a sealing and heat-conducting medium, and compared with a dry-type transformer, the oil-immersed transformer is low in cost, heat generated by work in the oil-immersed transformer is not easy to accumulate due to the protection effect of transformer oil, the transformer is convenient to dissipate heat, and meanwhile, working structures such as an inner coil are not easy to oxidize at high temperature in the working process, so that the use cost is greatly lower than that of the dry-type transformer.

However, the oil-immersed transformer is generally used in outdoor open areas with less people, and dry-type transformers with higher safety performance are generally selected in indoor areas with dense people, because the oil-immersed transformer can cause temperature and pressure rise after long-time high-temperature operation, and the oil-immersed transformer is easy to break locally, and once transformer oil which is inflammable and high in pollutants splashes around along with transformer explosion, the transformer oil splashed onto the human body is easy to cause irreversible damage to the skin, and even more, once the transformer is ignited, a large fire is easy to be induced, and serious casualties are caused.

Disclosure of Invention

1. Technical problem to be solved

The invention aims to provide an oil immersed transformer with an explosion-proof protection structure, which can prevent the whole transformer from bursting by controlling the pressure leakage point of transformer oil in the oil immersed transformer at high temperature and high pressure, is not easy to cause the splashing of the transformer oil along with the explosion fragments of the transformer, is not easy to cause injury to human bodies, is not easy to induce fire disasters and is not easy to cause serious casualties.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

The utility model provides an oil-immersed transformer with explosion-proof protection architecture, including oil-immersed transformer main part, it has the through-hole to cut open on the groove bottom plate of oil-immersed transformer main part, oil-immersed transformer main part inner chamber and external world are connected to the through-hole, explosion-proof protection kettle is connected in the through-hole, explosion-proof protection kettle includes kettle body and kettle neck two, kettle neck and through-hole threaded connection, the one end fixed connection kettle body of oil-immersed transformer main part is kept away from to the kettle neck, kettle body and oil-immersed transformer main part inner chamber pass through kettle neck intercommunication, the mouth of pipe department fixed connection movable sealing plug that is close to oil-immersed transformer main part one end of kettle neck, the movable sealing plug includes the sealing post, a plurality of extension arms of fixed connection on the outer wall, the extension arm is radial evenly distributed in the outside of sealing post, the one end fixed connection stiff end is kept away from to a plurality of extension arms, the extension arm has prefabricated groove with the junction of stiff end. The degree of depth of interior subsidiary metal mesh is the half of extension arm and stiff end thickness, a plurality of and the fan-shaped closing plate of activity sealing plug assorted of fixed connection on the kettle neck inner wall, the kettle neck is close to the mouth of pipe department fixed connection mount table of kettle body one end, fixed connection compression spring between mount table and the activity sealing plug, can realize preventing through the oil immersion transformer oil in the transformer that controls the whole emergence of transformer from bursting of the point of letting out of high temperature high pressure holding down pressure, difficult transformer oil that causes splashes along with transformer explosion piece, be difficult for causing the injury to the human body, be difficult for inducing the conflagration, be difficult for causing serious casualties.

Furthermore, an internal metal net is fixedly connected to the inner wall of the oil-immersed transformer main body, and one end, close to the inner wall of the oil-immersed transformer main body, of the internal metal net extends into the oil-immersed transformer main body, so that the strength of the oil-immersed transformer main body is increased, and the oil-immersed transformer main body is not prone to bursting under the action of high-temperature and high-pressure transformer oil.

Furthermore, the internal metal net is formed by weaving a plurality of high-elasticity metal wires, so that the elasticity of the internal metal net is increased, the protection effect of the internal metal net is increased, the internal metal net is not easy to deform irreversibly under the action of high-temperature and high-pressure transformer oil, and the internal metal net is not easy to lose efficacy.

Furthermore, the internal metal net has a tendency of shrinking inwards, so that pretightening force is set for the internal metal net, and the compression resistance effect of the internal metal net is improved.

Further, the lower extreme fixed connection spacing wing limit of sealed post, spacing wing limit external diameter is greater than the internal diameter of a plurality of fan-shaped sealing plate, provides spacing effect through the cooperation of fan-shaped sealing plate with spacing wing limit for the movable sealing plug is whole to be difficult for in the effect gliding kettle neck of compression spring.

Furthermore, the sealing fiber cluster is fixedly connected to the side wall of the mounting platform, the sealing fiber cluster fills a gap between the mounting platform and the kettle neck, flexible sealing in the mounting platform is achieved through the sealing fiber cluster, transformer oil falling from the kettle neck falls into the kettle body under the action of gravity potential energy or breaks through the sealing fiber cluster, and a transformer in the kettle body cannot easily pass through the sealing fiber cluster to form a leakage accident.

Furthermore, the sealing fiber cluster comprises a supporting part and a sealing part, the supporting part is fixedly connected with the side wall of the mounting table, and one end of the supporting part, far away from the side wall of the mounting table, is fixedly connected with the sealing part.

Furthermore, the supporting parts are straight rod-shaped, and adjacent supporting parts are mutually overlapped to form a net-shaped framework, so that the overall strength of the sealing fiber cluster is increased, and the sealing fiber cluster is not easy to collapse under the action of the transformer.

Further, the sealing part is three-dimensional heliciform, and adjacent sealing part twines each other and sets up on the netted skeleton that the supporting part formed, and the sealing part plays main flexible sealed effect, neither influences transformer oil and gets into the kettle body from the kettle neck in, also is difficult for forming the leakage of transformer oil from the kettle body to the kettle neck.

Furthermore, the supporting part is of a solid structure, the sealing part is of a hollow structure, the wall thickness of the sealing part is larger than one third of the diameter of the sealing part, and the overall sealing effect of the sealing fiber cluster is improved.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

when the oil-immersed transformer main body works for a long time and causes the transformer oil inside the oil-immersed transformer main body to be in a high-temperature and high-pressure state, the oil-immersed transformer main body is not easy to excessively deform and crack under the protection of the attached metal mesh, the pressure of the transformer oil can be concentrated at the connecting part between the oil-immersed transformer main body and the explosion-proof protection kettle, the high pressure of the transformer oil can generate high pressure on the movable sealing plug, the extension arm and the fixed end in the movable sealing plug are promoted to break along the direction of the prefabricated groove, the sealing column and the extension arm are promoted towards the kettle body, a gap is formed between the kettle neck and the movable sealing plug, the transformer oil in the oil-immersed transformer main body can enter the kettle neck through the gap, the pressure of the whole transformer oil in the oil-immersed transformer main body is reduced, and under the action of the compression spring in a compression state, the movable sealing plug is jacked back to the sector sealing plate to complete sealing.

Because the explosion-proof protection kettle is of a transparent structure, maintenance personnel can observe the amount of transformer oil in the explosion-proof protection kettle in the maintenance process and judge whether to maintain the oil-immersed transformer main body according to the amount of the transformer oil.

The transformer oil leakage prevention device can prevent the whole transformer from bursting by controlling the pressure leakage point of the transformer oil in the oil immersed transformer at high temperature and high pressure, is not easy to cause the splashing of the transformer oil along with the explosive fragments of the transformer, is not easy to cause harm to human bodies, is not easy to induce fire disasters, and is not easy to cause serious casualties.

Drawings

Fig. 1 is a side sectional view of an oil-immersed transformer according to the present invention in normal operation;

FIG. 2 is a schematic view of the structure at A in FIG. 1;

FIG. 3 is a schematic structural diagram of cooling oil in an oil-immersed transformer according to the present invention at high temperature and high pressure;

FIG. 4 is a schematic view of the structure at B in FIG. 3;

fig. 5 is a schematic structural diagram of an oil-immersed transformer according to the present invention;

FIG. 6 is a schematic view of the explosion protection kettle of the present invention;

FIG. 7 is an exploded view of the principal structure of the explosion protection kettle of the present invention;

fig. 8 is a schematic view of the movable sealing plug of the present invention;

FIG. 9 is a schematic structural view of an elastic fiber of the present invention;

fig. 10 is a partial structural schematic view of a sealed fiber mat at the mounting station of the present invention.

The reference numbers in the figures illustrate:

1 oil-immersed transformer main part, 2 explosion-proof protection kettles, 201 kettle body, 202 kettle neck, 3 internal metal net, 4 sector sealing plate, 5 movable sealing plug, 501 sealing column, 502 extension arm, 503 prefabricated groove, 504 fixed end, 505 spacing wing edge, 6 mounting platform, 7 compression spring, 8 sealing fiber cluster, 801 supporting part, 802 sealing part.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection can be direct connection or indirect connection through an intermediate medium, and can be communication inside the model adapting element. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-8, an oil-immersed transformer with an explosion-proof protection structure includes an oil-immersed transformer body 1, a through hole is drilled on a bottom plate of the oil-immersed transformer body 1, the through hole connects an inner cavity of the oil-immersed transformer body 1 with the outside, an explosion-proof protection pot 2 is connected in the through hole, the explosion-proof protection pot 2 includes two parts, namely a pot body 201 and a pot neck 202, the pot neck 202 is connected with the through hole by screw thread, one end of the pot neck 202 far away from the oil-immersed transformer body 1 is fixedly connected with the pot body 201, the pot body 201 is communicated with the inner cavity of the oil-immersed transformer body 1 by the pot neck 202, a pipe orifice of the pot neck 202 near one end of the oil-immersed transformer body 1 is fixedly connected with a movable sealing plug 5, the movable sealing plug 5 includes a sealing column 501, a plurality of extension arms 502 are fixedly connected to an outer wall, the extension arms 502 are radially and uniformly distributed outside the sealing column 501, one end of the plurality of the extension arms 502 far away from the sealing column 501 is fixedly connected with a fixed end 504, the joint of the extension arm 502 and the fixed end 504 is provided with a preformed groove 503; the depth of the inner attached metal net 3 is half of the thickness of the extension arm 502 and the fixed end 504, the inner wall of the kettle neck 202 is fixedly connected with a plurality of fan-shaped sealing plates 4 matched with the movable sealing plug 5, the pipe orifice of one end of the kettle neck 202 close to the kettle body 201 is fixedly connected with an installation platform 6, and a compression spring 7 is fixedly connected between the installation platform 6 and the movable sealing plug 5.

In particular, the oil-filled transformer body 1 may also include, but is not limited to: the insulator, the connector, the energizing coil and other structures are used for ensuring the normal operation of the oil-immersed transformer body 1, which is a known technology of a person skilled in the art, and the person skilled in the art knows how to set and operate the above devices, and therefore the person skilled in the art can reasonably design and install the above devices according to the prior art, which is not disclosed in detail in the present application.

Attach metal mesh 3 in the fixed connection on the inner wall of oil-immersed transformer main part 1, the one end that attaches metal mesh 3 is close to oil-immersed transformer main part 1 inner wall extends to in the oil-immersed transformer main part 1, increase the intensity of oil-immersed transformer main part 1, make oil-immersed transformer main part 1 be difficult for taking place to burst under the effect of high temperature high pressure transformer oil, attach metal mesh 3 chooses for use a plurality of high elastic metal wires to weave and form, the elasticity of attaching metal mesh 3 in the increase, the protection effect of attaching metal mesh 3 in the increase, make attaching metal mesh 3 in difficult the irreversible deformation that takes place under the effect of high temperature high pressure transformer oil, it is difficult for causing attaching metal mesh 3 to become invalid, attach metal mesh 3 in has the trend of inward contraction, set up the pretightning force for attaching metal mesh 3 in, the resistance to compression effect of attaching metal mesh 3 in the increase.

The lower extreme fixed connection spacing wing limit 505 of sealed post 501, spacing wing limit 505 external diameter are greater than the internal diameter of a plurality of fan-shaped sealing plate 4, provide spacing effect through the cooperation of fan-shaped sealing plate 4 with spacing wing limit 505 for movable sealing plug 5 is whole to be difficult for in the roll-off kettle neck 202 under compression spring 7's effect.

Referring to fig. 1-2 and 9-10, a sealing fiber bundle 8 is fixedly connected to the side wall of the mounting table 6, the sealing fiber bundle 8 fills the gap between the mounting table 6 and the kettle neck 202, the sealing fiber bundle 8 realizes flexible sealing in the mounting table 6, the transformer oil falling from the kettle neck 202 falls into the kettle body 201 under the action of gravity potential energy or breaks through the sealing fiber bundle 8, the transformer in the kettle body 201 cannot easily pass through the sealing fiber bundle 8 to form a leakage accident any more, the sealing fiber bundle 8 comprises a support portion 801 and a sealing portion 802, the support portion 801 is fixedly connected to the side wall of the mounting table 6, one end of the support portion 801 far away from the side wall of the mounting table 6 is fixedly connected to the sealing portion 802, the support portion 801 is in a straight rod shape, the adjacent support portions 801 are mutually overlapped to form a net-shaped framework, the overall strength of the sealing fiber bundle 8 is increased, so that the sealing fiber bundle 8 is not easy to collapse under the action of the transformer, sealing 802 is three-dimensional heliciform, adjacent sealing 802 intertwine and set up on the netted skeleton that supporting portion 801 formed, sealing 802 plays main flexible sealed effect, neither influence transformer oil from kettle neck 202 get into kettle body 201 in, also be difficult for forming transformer oil from kettle body 201 to kettle neck 202's leakage, supporting portion 801 is solid construction, sealing 802's hollow structure, sealing 802's wall thickness is greater than the one third of sealing 802 diameter, increase the holistic sealed effect of sealed fibre cluster 8.

When the oil-immersed transformer body 1 of the scheme works for a long time and causes the transformer oil inside the oil-immersed transformer body to be in a high-temperature and high-pressure state, under the protection of the attached metal mesh 3, the whole oil-immersed transformer body 1 is not easy to generate excessive deformation and crack, at the moment, the pressure of the transformer oil can be concentrated at the connecting part between the oil-immersed transformer body 1 and the explosion-proof protection pot 2, the high pressure of the transformer oil can generate high pressure on the movable sealing plug 5, and the extension arm 502 and the fixed end 504 in the movable sealing plug 5 are promoted to be broken along the direction of the prefabricated groove 503, and the sealing column 501 and the extension arm 502 are promoted towards the direction of the pot body 201, at the moment, a gap as shown in figures 3-4 is formed between the pot neck 202 and the movable sealing plug 5, the transformer oil in the oil-immersed transformer body 1 can enter the pot neck 202 through the gap, so that the pressure of the whole transformer oil in the oil-immersed transformer body 1 is reduced, at this moment, under the action of the compression spring 7 in a compression state, the movable sealing plug 5 is enabled to be jacked back to the fan-shaped sealing plate 4 to complete sealing, and as the anti-explosion protection kettle 2 is of a transparent structure, maintenance personnel can observe the amount of transformer oil in the anti-explosion protection kettle 2 in the maintenance process and judge whether to maintain the oil-immersed transformer main body 1 according to the amount of the transformer oil.

In particular, when maintaining oil-immersed transformer main part 1, need emit the transformer oil in oil-immersed transformer main part 1 completely earlier, later with explosion-proof protection kettle 2 unscrew from oil-immersed transformer main part 1 again, and have sealed fibre cluster 8 to protect in the explosion-proof protection kettle 2 of being unscrewed, in the transportation, even appear jolting or turning on one's side, transformer oil of interim deposit also is difficult for leaking in explosion-proof protection kettle 2 in the explosion-proof protection kettle 2, be difficult for causing the pollution, be difficult for leaving the conflagration hidden danger.

The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims

1. The utility model provides an oil-immersed transformer with explosion-proof protection architecture, includes oil-immersed transformer main part (1), its characterized in that: the oil immersed transformer is characterized in that a through hole is drilled on a groove bottom plate of the oil immersed transformer main body (1), an inner cavity of the oil immersed transformer main body (1) is connected with the outside through the through hole, an explosion-proof protective pot (2) is connected in the through hole, the explosion-proof protective pot (2) comprises a pot body (201) and a pot neck (202), the pot neck (202) is in threaded connection with the through hole, one end of the pot neck (202) is far away from the oil immersed transformer main body (1) and fixedly connected with the pot body (201), the pot body (201) is communicated with the inner cavity of the oil immersed transformer main body (1) through the pot neck (202), a pipe orifice of the pot neck (202) close to one end of the oil immersed transformer main body (1) is fixedly connected with a movable sealing plug (5), the movable sealing plug (5) comprises a sealing column (501), a plurality of extension arms (502) are fixedly connected on the outer wall, and the extension arms (502) are radially and uniformly distributed on the sealing column (501), a plurality of extension arms (502) are fixedly connected with a fixed end (504) at one end away from the sealing column (501), and a prefabricated groove (503) is drilled at the joint of the extension arms (502) and the fixed end (504);

attach metal mesh (3) in the fixed connection on oil-immersed transformer main part (1) inner wall, the one end that attaches metal mesh (3) and be close to oil-immersed transformer main part (1) inner wall extends to oil-immersed transformer main part (1), the degree of depth that attaches metal mesh (3) in is the half of extension arm (502) and stiff end (504) thickness, a plurality of and movable sealing plug (5) assorted fan-shaped closing plate (4) of fixed connection on kettle neck (202) inner wall, kettle neck (202) are close to mouth of pipe department fixed connection mount table (6) of kettle body (201) one end, fixed connection compression spring (7) between mount table (6) and movable sealing plug (5).

2. The oil-filled transformer with the explosion-proof protection structure according to claim 1, wherein: the internal metal net (3) has a tendency to contract inwards.

3. The oil-filled transformer with the explosion-proof protection structure according to claim 1, wherein: the lower end of the sealing column (501) is fixedly connected with a limiting wing edge (505), and the outer diameter of the limiting wing edge (505) is larger than the inner diameter of the fan-shaped sealing plates (4).

4. The oil-filled transformer with the explosion-proof protection structure according to claim 1, wherein: the side wall of the mounting platform (6) is fixedly connected with a sealing fiber cluster (8), and the sealing fiber cluster (8) fills a gap between the mounting platform (6) and the kettle neck (202).

5. An oil-filled transformer with an explosion-proof protection structure according to claim 4, characterized in that: sealed fibre cluster (8) include supporting part (801) and sealing portion (802) two, supporting part (801) and mount table (6) lateral wall fixed connection, one end fixed connection sealing portion (802) of mount table (6) lateral wall are kept away from to supporting part (801).

6. An oil-filled transformer with an explosion-proof protection structure according to claim 5, characterized in that: the supporting parts (801) are straight rod-shaped, and the adjacent supporting parts (801) are mutually overlapped to form a net-shaped framework.

7. An oil-filled transformer with an explosion-proof protection structure according to claim 5, characterized in that: the sealing parts (802) are in a three-dimensional spiral shape, and the adjacent sealing parts (802) are mutually wound and erected on a net-shaped framework formed by the supporting part (801).

8. An oil-filled transformer with an explosion-proof protection structure according to claim 5, characterized in that: the supporting portion (801) is of a solid structure, the sealing portion (802) is of a hollow structure, and the wall thickness of the sealing portion (802) is larger than one third of the diameter of the sealing portion (802).