A pressure-balanced expansion joint device for 1100kV GIS.

Abstract

The utility model relates to a kind of 1100kV GIS elbow pipe pressure balance type expansion joint device, belong to the technical field of extra-high voltage equipment.Its structure includes corner tank and metal bellows compensator;Two metal bellows compensators are located at the two sides of corner tank;The flange of the metal bellows compensator on each side is fixedly connected with corner tank;The flange four corners outside two metal bellows compensators are respectively provided with through hole, and four tie rods pass through the inside flange of corner tank and metal bellows compensator respectively, then pass through the through hole of outside flange and lock with lock nut.The device solves the abnormal stress problem in the temperature compensation process of corner bus structure, improves the safety and reliability of bus in power supply system.

Description

Technical Field

[0001] This utility model relates to a pressure-balanced expansion joint device for 1100kV GIS, belonging to the technical field of ultra-high voltage equipment. Background Technology

[0002] Currently, there are numerous power equipment operating in the power grid. Among them, various types of 1100kV GIS busbars require expansion joint devices to compensate for changes in temperature, ensuring the safety and reliability of the busbars within the system during routine operation and maintenance. Therefore, stable and highly reliable expansion joint compensation devices are indispensable for power supply systems.

[0003] Besides errors in civil construction and equipment installation, when the busbar of an 1100kV GIS is affected by temperature changes during operation, the blind flange force will have a significant impact on both the busbar and the metal bellows compensator when using a metal bellows compensator to compensate for the busbar elongation. If the tank length changes little due to thermal expansion and contraction, the rigidity of the tank at the corner can be used to achieve free compensation. However, this compensation method will result in abnormal stress on the corner tank when the blind flange force exceeds a certain amount. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a pressure-balanced expansion joint device for 1100kV GIS, which solves the problem of abnormal stress in the temperature compensation process of the corner busbar structure and improves the safety and reliability of the busbar in the power supply system.

[0005] To solve the above problems, the specific technical solution of this utility model is as follows: A 1100kV GIS bend pressure balance type expansion joint device includes a corner tank and a metal bellows compensator; two metal bellows compensators are respectively located on both sides of the corner tank; one side flange of each metal bellows compensator is fixedly connected to the corner tank; the four corners of the outer flanges of the two metal bellows compensators are respectively provided with through holes, and the four tie rods pass through the inner flanges of the corner tank and the metal bellows compensator, and then pass through the through holes of the outer flanges and are locked with locking nuts.

[0006] The flanges at both ends of the metal bellows compensator are connected by guide rods.

[0007] The guide rod is provided with limiting nuts on the inner and outer sides of the outer flange, and the distance between the two limiting nuts is greater than the deformation of the metal bellows compensator.

[0008] The outer flange of the metal bellows compensator is provided with reinforcing ribs on the inner side.

[0009] The 1100kV GIS bend pressure balance type expansion joint device of this application adopts the structure of metal bellows compensators on both sides, which can achieve self-balancing. Moreover, the flanges at both ends of the two metal bellows compensators can effectively offset the blind plate force, effectively solving the problem of abnormal stress on the corner tank. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the main view structure of this application.

[0011] Figure 2 This is a schematic diagram of a metal bellows compensator. Detailed Implementation

[0012] like Figure 1 and Figure 2 As shown, a 1100kV GIS bend pressure-balanced expansion joint device includes a corner tank 1 and two metal bellows compensators 2. Two metal bellows compensators 2 are located on opposite sides of the corner tank 1. One flange of each metal bellows compensator 2 is fixedly connected to the corner tank 1. Through holes are provided at the four corners of the outer flanges of the two metal bellows compensators 2. Four tie rods 3 pass through the inner flanges of the corner tank 1 and the metal bellows compensators 2, respectively, and then through the through holes of the outer flanges to be locked with locking nuts 4. The two metal bellows compensators can achieve self-balancing, and the flanges at both ends of the two metal bellows compensators can effectively counteract blind plate forces. Reinforcing ribs 7 are provided on the inner sides of the outer flanges of the two metal bellows compensators to increase the strength of the metal bellows compensator flanges, effectively counteracting the blind plate forces generated when the tank length changes, and solving the problem of abnormal stress on the corner tank.

[0013] The two flanges of the metal bellows compensator 2 are connected by guide rods 5 to ensure that the device does not deflect radially along the generatrix during temperature compensation. Limiting nuts 6 are provided on the inner and outer sides of the outer flange of the guide rod 5, and the distance between the two limiting nuts 6 is greater than the deformation of the metal bellows compensator 2 to ensure that the metal bellows compensator 2 can work normally.

Claims

1. A pressure-balanced expansion joint device for 1100kV GIS, characterized in that: It includes a corner tank (1) and a metal bellows compensator (2); the two metal bellows compensators (2) are located on both sides of the corner tank (1); the flange on one side of the metal bellows compensator (2) on each side is fixedly connected to the corner tank (1); the four corners of the flanges on the outside of the two metal bellows compensators (2) are provided with through holes, and the four tie rods (3) pass through the inner flanges of the corner tank (1) and the metal bellows compensator (2) on both sides, and then pass through the through holes of the outer flanges and are locked with locking nuts (4).

2. The 1100kV GIS bend pressure-balanced expansion joint device according to claim 1, characterized in that: The flanges at both ends of the metal bellows compensator (2) are connected by guide rods (5).

3. The 1100kV GIS bend pressure-balanced expansion joint device according to claim 2, characterized in that: The guide rod (5) has a limiting nut (6) on the inner and outer sides of the outer flange, and the distance between the two limiting nuts (6) is greater than the deformation of the metal bellows compensator (2).

4. The 1100kV GIS bend pressure-balanced expansion joint device according to claim 1, characterized in that: The metal bellows compensator (2) has a reinforcing rib (7) on the inner side of the outer flange.

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