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CN-122025349-A - Oil immersed transformer with pressure release structure

CN122025349ACN 122025349 ACN122025349 ACN 122025349ACN-122025349-A

Abstract

The invention provides an oil immersed transformer with a pressure relief structure, which belongs to the technical field of oil immersed transformers and comprises a transformer shell, a pressure relief pipe and a pressure relief cylinder. The pressure relief cylinder is internally fixed with a supporting plate, the supporting plate is provided with an air inlet hole and an air outlet hole, the air inlet hole is communicated with the pressure relief pipe, the air outlet hole is connected with an exhaust pipe extending to the outer side of the pressure relief cylinder, the supporting plate is rotationally connected with an impeller, and the inside of the pressure relief cylinder is divided into a plurality of circumferentially distributed exhaust chambers by the impeller. According to the invention, the plurality of circumferentially distributed exhaust chambers which are independent of each other are arranged, the plurality of exhaust chambers are sequentially communicated with the air inlet holes along with the rotation of the exhaust chambers, so that the gas released by the transformer is circularly received, and meanwhile, the plurality of exhaust chambers are sequentially communicated with the air outlet holes for circularly exhausting, so that the exhaust channel of the transformer is always in a non-communicated state with the external environment while the pressure relief of the exhaust is realized, and the external air is effectively prevented from entering the transformer.

Inventors

  • LI YONGQUAN
  • LI JING
  • LI JINGPING

Assignees

  • 徐州国力电力设备有限公司

Dates

Publication Date
20260512
Application Date
20260227

Claims (9)

  1. 1. An oil immersed transformer with pressure relief structure, characterized in that it comprises: the top of the transformer shell (1) is connected with a pressure relief pipe (11) for exhausting; A pressure release cylinder (2) with the bottom connected to the pressure release pipe (11); The pressure relief cylinder (2) is internally fixed with a supporting plate (21), an air inlet hole (201) and an air outlet hole (202) are formed in the supporting plate (21), the air inlet hole (201) is communicated with the pressure relief pipe (11), and an exhaust pipe (4) extending to the outer side of the pressure relief cylinder (2) is connected to the air outlet hole (202); The pressure relief cylinder is characterized in that an impeller (3) is rotationally connected to the supporting plate (21), the inside of the pressure relief cylinder (2) is divided into a plurality of circumferentially distributed exhaust cavities (301) by the impeller (3), sealing plugs (31) are slidably arranged in the exhaust cavities (301), and springs (32) capable of driving the sealing plugs (31) to slide downwards are connected to the impeller (3); the pressure release cylinder (2) is provided with a driving unit for driving the impeller (3) to rotate, so that a plurality of exhaust cavities (301) can be circularly corresponding to the air inlet holes (201) and the air outlet holes (202).
  2. 2. The oil immersed transformer with the pressure relief structure as claimed in claim 1, wherein a cover plate (33) is fixed on the top of the impeller (3), and a plurality of air pressure holes (302) corresponding to the air exhaust cavity (301) are formed in the cover plate (33) and used for balancing air pressure in the air exhaust cavity (301).
  3. 3. The oil-immersed transformer with the pressure relief structure according to claim 2, wherein a supporting plate (311) is fixed on the top surface of the sealing plug (31), and the supporting plate (311) is matched with the shape of the sealing plug (31).
  4. 4. An oil-immersed transformer with a pressure relief structure according to claim 3, characterized in that the two ends of the spring (32) are connected to the support plate (311) and the cover plate (33), respectively.
  5. 5. The oil-immersed transformer with the pressure relief structure according to claim 4, wherein a limiting rod (321) is arranged on the inner side of the spring (32), the bottom end of the limiting rod (321) is fixed on the supporting plate (311), and the top end of the limiting rod (321) penetrates through the cover plate (33) in a sliding mode.
  6. 6. The oil-immersed transformer with the pressure relief structure according to claim 5, wherein the length of the limiting rod (321) is larger than the height of the impeller (3).
  7. 7. The oil-immersed transformer with the pressure relief structure according to claim 1, wherein one end of the exhaust pipe (4) extending to the outer side of the pressure relief cylinder (2) is connected with an elbow pipe (41).
  8. 8. The oil-immersed transformer with the pressure relief structure according to claim 2, wherein the driving unit comprises a toothed ring (5) and a motor (51), the toothed ring (5) is fixed on the cover plate (33), the toothed ring (5) and the impeller (3) are coaxially arranged with each other, the motor (51) is fixed on the pressure relief cylinder (2), and a driving gear is fixed at an output end of the motor (51), and the driving gear is meshed with the toothed ring (5).
  9. 9. The oil-immersed transformer with the pressure relief structure according to claim 1, wherein a dust cap (6) is arranged at the top of the pressure relief cylinder (2), the dust cap (6) and the pressure relief cylinder (2) are coaxially arranged, and the inner diameter of the dust cap (6) is larger than the outer diameter of the pressure relief cylinder (2), so that an exhaust gap (601) is formed between the outer side wall of the pressure relief cylinder (2) and the inner side wall of the dust cap (6).

Description

Oil immersed transformer with pressure release structure Technical Field The invention belongs to the technical field of oil-immersed transformers, and particularly relates to an oil-immersed transformer with a pressure relief structure. Background An oil-immersed transformer is a key electrical device that utilizes insulating oil as a cooling and insulating medium. The iron core and the winding are usually soaked in mineral oil, and the insulating oil not only effectively isolates air and moisture and prevents oxidation, but also can transfer heat generated during operation to the radiator through circulating flow, so that the transformer is ensured to stably operate. The structure enables the oil immersed transformer to have the advantages of good heat radiation performance, strong overload capacity, long insulation service life, relatively low cost and the like, and is widely applied to power grid substations, industrial and mining enterprises and power distribution systems. In order to prevent the insulating oil from deteriorating, the inside of the oil-immersed transformer is generally designed in a sealing structure. In the running process of the equipment, the insulating oil is heated to decompose to generate gas, so that the internal pressure is easy to rise abnormally. Currently, the pressure relief valve is installed to perform pressure relief and exhaust so as to ensure the safe operation of equipment. However, the traditional pressure release valve is automatically opened by means of internal air pressure, the inside of the transformer is directly communicated with the external environment at the moment when the valve is opened, and if the valve cannot be reset and closed in time after pressure release is completed, the external air can enter the box body, so that oxidation of insulating oil is accelerated, and the insulating performance and the service life of the insulating oil are influenced. Disclosure of Invention In view of the foregoing, it is an object of the present invention to provide an oil-immersed transformer with a pressure relief structure, which at least partially solves the problems set forth in the background art. The invention provides an oil immersed transformer with a pressure relief structure, which comprises the following components: the top of the transformer shell is connected with a pressure relief pipe for exhausting; the bottom of the pressure release cylinder is connected to the pressure release pipe; the pressure release cylinder is internally fixed with a supporting plate, an air inlet and an air outlet are arranged on the supporting plate, the air inlet is communicated with the pressure release pipe, and an exhaust pipe extending to the outer side of the pressure release cylinder is connected to the air outlet; The pressure release cylinder is characterized in that an impeller is rotationally connected to the supporting plate, the interior of the pressure release cylinder is divided into a plurality of circumferentially distributed exhaust cavities by the impeller, sealing plugs are slidably arranged in the exhaust cavities, and springs capable of driving the sealing plugs to slide downwards are connected to the impeller; the pressure release cylinder is provided with a driving unit for driving the impeller to rotate, so that a plurality of exhaust cavities can be circularly corresponding to the air inlet holes and the exhaust holes. Further, a cover plate is fixed at the top of the impeller, and a plurality of air pressure holes corresponding to the exhaust cavity are formed in the cover plate and used for balancing air pressure in the exhaust cavity. Further, the top surface of the sealing plug is fixed with a supporting plate, and the supporting plate is matched with the shape of the sealing plug. Further, two ends of the spring are respectively connected to the supporting plate and the cover plate. Further, a limiting rod is arranged on the inner side of the spring, the bottom end of the limiting rod is fixed on the supporting plate, and the top end of the limiting rod penetrates through the cover plate in a sliding mode. Further, the length of the limiting rod is greater than the height of the impeller. Further, one end of the exhaust pipe extending to the outer side of the pressure relief cylinder is connected with an elbow. Further, the driving unit comprises a toothed ring and a motor, the toothed ring is fixed on the cover plate, the toothed ring and the impeller are coaxially arranged, the motor is fixed on the pressure release cylinder, the output end of the motor is fixed with a driving gear, and the driving gear is meshed with the toothed ring. Further, the top of pressure release section of thick bamboo is provided with the shield, just the shield with the pressure release section of thick bamboo is mutual coaxial arrangement, the internal diameter of shield is greater than the external diameter of pressure release section of thick bamboo, make the