CN211719410U

CN211719410U - Transformer bushing with improved sealing structure

Info

Publication number: CN211719410U
Application number: CN202020346792.9U
Authority: CN
Inventors: 韦晓星; 张晋寅; 楚金伟
Original assignee: Maintenance and Test Center of Extra High Voltage Power Transmission Co
Current assignee: Maintenance and Test Center of Extra High Voltage Power Transmission Co
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2020-10-20
Anticipated expiration: 2030-03-18

Abstract

The utility model discloses a transformer bushing with an improved sealing structure, which relates to high-voltage maintenance equipment, and comprises a conductive tube, an oil conservator, an elastic plate, an oil conservator cover plate, a conductive head, an upper clamping ring, a lower clamping ring, a first connecting piece, a second connecting piece and a first sealing ring; the utility model discloses make the conductive head effectively keep apart with conductive tube current-carrying screw thread contact surface and outside environment air, avoided the corruption to current-carrying screw thread contact surface such as humidity and acid rain in the ambient air, the contact surface of conductive head and conductive tube is the current-carrying contact surface, and lower clamping ring coaxial cover is established on the conductive tube and is fixed at the up end of clamping ring down by first connecting piece, goes up the clamping ring coaxial cover and establish on the conductive tube and by the up end of second connecting piece, goes up the clamping ring, down between the inboard of clamping ring and the lateral surface of conductive head, the utility model discloses make conductive head and conductive tube current-carrying screw thread contact surface and outside environment air effectively keep apart.

Description

Transformer bushing with improved sealing structure

Technical Field

The utility model relates to a high-pressure maintenance equipment, concretely relates to improve seal structure's transformer bushing.

Background

The oil-immersed alternating current bushing is often used as an important component of a converter transformer, the head part of the oil-immersed alternating current bushing mainly comprises a bushing current-carrying structure which is a guide rod type current-carrying structure, the head part of the oil-immersed alternating current bushing is a current-carrying structure in which a conductive head is screwed with a conductive pipe thread to carry current, and the conductive head part is provided with a split wiring board. Because the expansion and contraction of the sleeve guide rod and the relative displacement of the sleeve outer sleeve can only occur at the top of the oil conservator, after the temperature of the conductive tube rises and expands (the thermal expansion coefficient of the conductive tube is larger than that of a ceramic part), a gap can be generated between the lower brim and a transition plate on the oil conservator cover plate, so that the thread contact force is reduced, and the conductive head is loosened. After the sleeve is installed on site, the lead and the sleeve have a certain included angle, so that the conductive head is acted by lateral force, and meanwhile, wind power and current conversion transformer vibration are also acted on the loosened conductive head, so that the contact resistance of the thread contacted by gravity under a static state is increased, and the thread generates heat under the action of load current. The main function of the bushing top designed conductive head is to prevent rain and moisture from entering from the bushing top. The structure needs to consider the problem of thermal expansion of the conductive tube, and the elastic plate is mainly used for sealing the shaft of the conductive tube at the top of the sleeve and reserving a certain expansion with heat and contraction with cold margin for the conductive tube. Although the conductive head with the half structure is designed, the current-carrying contact surface is still inevitably corroded by external influence, and then the current-carrying capacity is influenced.

SUMMERY OF THE UTILITY MODEL

To the not enough among the prior art, the utility model provides an improve seal structure's transformer bushing uses through the cooperation of last clamping ring, lower clamping ring and sealing member, makes conducting head and the effective isolation of contact tube current-carrying screw thread contact surface and outside ambient air, has avoided humidity and acid rain etc. in the ambient air to the corruption of current-carrying screw thread contact surface, the good electric contact situation of assurance screw thread current-carrying contact surface that can be long-term.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

a transformer bushing with an improved sealing structure comprises a conductive tube, an oil conservator, an elastic plate and an oil conservator cover plate, wherein the oil conservator cover plate is covered on the oil conservator, the elastic plate is arranged between the oil conservator cover plate and the oil conservator, one end of the conductive tube penetrates out of the oil conservator cover plate, and the transformer bushing also comprises a conductive head, an upper pressing ring, a lower pressing ring, a first connecting piece, a second connecting piece and a first sealing ring; the conductive tube penetrates out one end of the conservator cover plate is provided with the conductive head, the lower pressing ring is coaxially sleeved on the conductive tube and fixed on the upper end face of the conservator cover plate through a first connecting piece, the upper pressing ring is coaxially sleeved on the conductive tube and fixed on the upper end face of the lower pressing ring through a second connecting piece, and a first sealing ring is arranged between the upper pressing ring and the outer side face of the conductive head in a sealing mode.

According to the transformer bushing with the improved sealing structure, further, the upper pressing ring is an annular ring, and an upper sealing gasket is arranged between the inner ring surface of the upper pressing ring and the outer side surface of the conductive head.

The transformer bushing with the improved sealing structure further comprises a lower pressing ring, wherein the lower pressing ring is provided with an inner cavity, the diameter of the inner cavity is larger than that of the conductive head, an upper flange extending towards the conductive head is arranged on the upper end face of the lower pressing ring, a lower flange far away from the conductive head is arranged on the lower end face of the lower pressing ring, the lower flange is fixedly penetrated through the upper end face of the lower pressing ring by the first connecting piece, and a lower sealing gasket is arranged between the lower end face of the lower pressing ring and the upper end face of the conservator cover plate.

The transformer bushing with the improved sealing structure as described in any of the above, further, a limit washer is disposed between the lower end surface of the upper pressing ring and the upper end surface of the lower pressing ring, and the second connecting member passes through the limit washer.

The transformer bushing with the improved sealing structure as described in any of the above, further, the first sealing ring is a spherical fluorine rubber ring.

The transformer bushing with the improved sealing structure as described in any one of the above, further, the conductive head has a hough structure.

The transformer bushing with the improved sealing structure as described in any one of the above, further, the first connecting piece and the second connecting piece are bolts.

Compared with the prior art, the utility model, its beneficial effect lies in:

1. the half-structure conductive head and the current-carrying conduit are locked through the bolt and the elastic pad, so that the influence of the stress of a current-guiding bus and the vibration of a main transformer on the tightness of threaded connection in operation can be eliminated, and poor contact of the conductive head and the current-carrying conduit in threaded connection is avoided.

2. The current-carrying thread contact surface of the conductive head and the conductive tube is completely isolated from the external ambient air by the matching use of the sealing washer, the limiting washer and the spherical fluorine rubber ring, so that the corrosion of humidity, acid rain and the like in the ambient air to the current-carrying thread contact surface is avoided, and the good electric contact condition of the thread current-carrying contact surface can be ensured for a long time.

3. Through the effect of the upper sealing washer, when the temperature change guide pipe extends or shortens relative to the oil pillow cover, the influence of the temperature change on the length change of the guide pipe is eliminated through the relative movement of the cylindrical surface of the conductive head and the contact surface of the sealing washer.

Drawings

Fig. 1 is a schematic structural diagram of a transformer bushing with an improved sealing structure according to the present invention;

wherein: 1. a conductive tube; 2. an oil conservator; 3. an elastic plate; 4. a conservator cover plate; 5. a conductive head; 6. an upper pressing ring; 7. pressing a ring; 8. a first connecting member; 9. a second connecting member; 10. a spherical fluorine rubber ring; 11. an upper sealing washer; 12. a lower sealing gasket; 13. a limiting washer; 14. a current carrying contact surface.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example (b):

referring to fig. 1, a transformer bushing with an improved sealing structure comprises a conductive tube 1, an oil conservator 2, an elastic plate 3, an oil conservator 2 cover plate, a conductive head 5, an upper pressing ring 6, a lower pressing ring 7, a first connecting piece 8, a second connecting piece 9 and a first sealing ring, wherein the oil conservator 2 cover plate is covered on the oil conservator 2, the elastic plate 3 is arranged between the oil conservator 2 cover plate and the oil conservator 2, and one end of the conductive tube 1 penetrates through the oil conservator 2 cover plate; one end of the conductive tube 1 penetrating through the cover plate of the oil conservator 2 is sleeved with a conductive head 5, the contact surface between the conductive head 5 and the conductive tube 1 is a current-carrying contact surface 14, a lower pressing ring 7 is coaxially sleeved on the conductive tube 1 and is fixed on the upper end surface of the cover plate of the oil conservator 2 by a first connecting piece 8, an upper pressing ring 6 is coaxially sleeved on the conductive tube 1 and is fixed on the upper end surface of the lower pressing ring 7 by a second connecting piece 9, first sealing rings are hermetically arranged between the inner sides of the upper pressing ring 6 and the lower pressing ring 7 and the outer side surface of the conductive head 5, specifically, the first sealing rings are spherical fluorine rubber rings 10, the service temperature of the spherical fluorine rubber rings 10 is-20-250 ℃, and the first connecting piece 8 and the second connecting piece 9 adopt.

Furthermore, the upper pressing ring 6 is an annular ring, and an upper sealing washer 11 is arranged between the inner ring surface of the upper pressing ring 6 and the outer side surface of the conductive head 5. Through the effect of upper seal ring 11, when the temperature change guide pipe extends or shortens relative to the oil pillow 2 cover, through the relative movement of the cylindrical surface of conductive head 5 and the contact surface of seal ring, the influence of temperature change on the length change of guide pipe has been solved.

Further, lower clamping ring 7 has the inner chamber, and the diameter of this inner chamber is greater than the diameter of electrically conductive head 5, and the up end of lower clamping ring 7 has the lower flange of keeping away from electrically conductive head 5 to the upper flange that electrically conductive head 5 extended and the lower terminal surface of lower clamping ring 7, and the lower flange is run through by first connecting piece 8 and is fixed at the up end of lower clamping ring 7, is provided with lower seal ring 12 between the up end of the lower terminal surface of lower clamping ring 7 and the upper end of conservator 2 apron.

Further, a limit washer 13 is arranged between the lower end face of the upper pressing ring 6 and the upper end face of the lower pressing ring 7, and the second connecting piece 9 penetrates through the limit washer 13. The current-carrying thread contact surface of the conductive head 5 and the conductive tube 1 is completely isolated from the external ambient air by the matching use of the sealing washer, the limiting washer 13 and the spherical fluorine rubber ring 10, so that the corrosion of humidity, acid rain and the like in the ambient air to the current-carrying thread contact surface is avoided, and the good electric contact condition of the thread current-carrying contact surface 14 can be ensured for a long time.

Further, the conductive head 5 has a hough structure, the conductive head 5 adopts the hough structure, that is, symmetrically arranged slots are formed at the symmetrical positions of the two sides of the conductive head 5, and the side surfaces of the two slots are respectively provided with 2 through holes penetrating through the conductive head 5, and the number of the through holes is 4 in total. When the conductive head 5 is in threaded connection with the conductive tube 1, the through hole is provided with the screw and the nut, so that the conductive head 5 clamps the conductive tube 1, the conductive head 5 and the conductive tube 1 can be kept fixed even if the temperature of the conductive tube 1 rises and expands to generate a gap, and the conductive head and the conductive tube 1 cannot rotate and fall off easily due to looseness. The half-structure conductive head 5 and the current-carrying conduit are locked through the bolt and the elastic pad, so that the influence of the stress of a current-guiding bus and the vibration of a main transformer on the tightness of the threaded connection in operation can be eliminated, and the poor contact of the conductive head 5 and the current-carrying conduit connection thread is avoided.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A transformer bushing with an improved sealing structure comprises a conductive tube, an oil conservator, an elastic plate and an oil conservator cover plate, wherein the oil conservator cover plate is covered on the oil conservator, the elastic plate is arranged between the oil conservator cover plate and the oil conservator, and one end of the conductive tube penetrates out of the oil conservator cover plate; the conductive tube penetrates out one end of the conservator cover plate is provided with the conductive head, the lower pressing ring is coaxially sleeved on the conductive tube and fixed on the upper end face of the conservator cover plate through a first connecting piece, the upper pressing ring is coaxially sleeved on the conductive tube and fixed on the upper end face of the lower pressing ring through a second connecting piece, and a first sealing ring is arranged between the upper pressing ring and the outer side face of the conductive head in a sealing mode.

2. The transformer bushing with the improved sealing structure according to claim 1, wherein the upper pressing ring is an annular ring, and an upper sealing gasket is arranged between an inner ring surface of the upper pressing ring and an outer side surface of the conductive head.

3. The transformer bushing with the improved sealing structure according to claim 2, wherein the lower pressing ring has an inner cavity with a diameter larger than that of the conductive head, an upper end surface of the lower pressing ring has an upper flange extending towards the conductive head, a lower end surface of the lower pressing ring has a lower flange far away from the conductive head, the lower flange is fixed on the upper end surface of the lower pressing ring by the first connecting piece in a penetrating manner, and a lower sealing gasket is arranged between the lower end surface of the lower pressing ring and the upper end surface of the conservator cover plate.

4. The transformer bushing with the improved sealing structure according to any one of claims 1 to 3, wherein a limit washer is arranged between the lower end surface of the upper pressing ring and the upper end surface of the lower pressing ring, and the second connecting member passes through the limit washer.

5. The transformer bushing with the improved sealing structure according to any one of claims 1 to 3, wherein the first sealing ring is a spherical fluorine rubber ring.

6. The transformer bushing with the improved sealing structure according to any one of claims 1 to 3, wherein the conductive head has a half structure.

7. The transformer bushing with the improved sealing structure according to any one of claims 1 to 3, wherein the first connecting piece and the second connecting piece are bolts.