CN201160197Y - Multifunctional SF6 electrical equipment charging and deflation integrated connector - Google Patents

Abstract

The utility model relates to a multi-functional integrated SF6 gas filling and discharging connector for electrical equipment. A gas channel is preset in an integrated block, and a one-way inverted valve, a needle regulating valve, a gate valve, a changeover valve, a vacuum meter, an SF6 density meter and three pipeline connectors are combined together. The multi-functional integrated gas filling and discharging connector has the advantages that repeated changes is not required after pipeline connection is finished once; the built-in directional inverted valve can effectively prevent the gas containing impurity from entering the equipment; the gas input can be adjusted when SF6 gas crashes in, to prevent SF6 liquid from entering the equipment; the change of the internal pressure of the equipment can be switched to be monitored at any time.

Description

Multifunctional SF6 electrical equipment charging and deflation integrated connector

Technical field:

The utility model belongs to a special tool for installation and maintenance of electrical equipment in the power supply and distribution industry, in particular to a control device for vacuum drying, gas charging and recovery of SF6 (sulfur hexafluoride) electrical equipment.

Background technique:

SF6 (sulfur hexafluoride, the same below) gas has excellent thermal conductivity, insulation, and arc extinguishing properties, and is widely used in the power industry for high-current and large-capacity electrical equipment with a voltage level of 35kV and above. When SF6 equipment is installed or overhauled and maintained, it is necessary to vacuum-dry the equipment and flush with SF6 gas. The work content mainly includes the process of extracting vacuum from the equipment and maintaining the vacuum degree, using the internal vacuum negative pressure of the electrical equipment to slowly inject fully vaporized SF6 gas. In the stage of vacuum extraction and vacuum maintenance of the equipment, it is strictly forbidden to reverse the vacuum pump when the power is turned off, otherwise oil and impurities will follow the air to flow back into the electrical equipment, causing irreversible damage to the insulation of the electrical equipment. At present, the vacuum extraction and gas injection of SF6 electrical equipment can only be carried out separately, and there are shortcomings: 1. The vacuum drying process requires repeated charging and deflation operations, and multiple pipeline changes; It needs to share the power supply with the vacuum pump, the wiring is complicated, it takes a long time to close the solenoid valve, and there is still a small amount of air backflow after closing, and the reliability of the measures to prevent air backflow is poor; 3. It is necessary to install special vacuum and pressure monitoring instruments during the operation. It is impossible to directly check the actual pressure changes inside the equipment at any time; 4. It is difficult to control the intake air volume when SF6 gas rushes in.

The utility model provides a multifunctional SF6 electrical equipment charging and discharging integrated joint, which does not need to be changed repeatedly after the pipeline connection is completed once; the built-in one-way check valve can effectively prevent the gas containing impurities from entering the inside of the equipment; , can adjust the air intake, prevent liquid SF6 from entering the electrical equipment; switch at any time to monitor the internal pressure changes of electrical equipment and other functions.

Invention content:

In order to achieve the above purpose, the technical scheme adopted by the utility model is: a one-way check valve, a needle regulating valve, a switching valve, an SF6 density gauge, and a vacuum degree gauge are combined on the manifold. Its characteristics are: one end of the integrated block is provided with a pipe joint connected to the vacuum pump and a joint connected to the SF6 inflatable pipeline, which respectively constitute a vacuum extraction gas circuit and an SF6 inflatable pipeline; The side of the integrated block is used to recover the waste SF6 gas in the equipment; the SF6 density gauge and vacuum gauge are installed on the upper plane of the integrated block.

Manifold (10) can preset a number of air passages inside as required. The one-way check valve (1) is assembled in the reserved hole of the manifold (10) by a spring, a sealing steel ball and a ball holder, and the one-way check valve (1) On the outside of the valve (1), there is a pipe joint (8) connected to the vacuum pump; there is a switching valve (3) between the vacuum gauge (5) and the SF6 density gauge (4), all of which are installed on the manifold (10) Plane; the SF6 inflation pipeline connector (9) and the needle regulating valve (2) are installed on the same airway, the valve handle is on the side; the gate valve (6) is installed on the airway leading to the equipment, and the SF6 recovery pipeline connector (11) is connected externally ; The pipe joint (7) connected to the electrical equipment is contained in the other end of the integrated block (10).

The utility model optimizes the working procedures of SF6 electrical equipment waste gas recovery, vacuum drying and fresh air rushing in, can quickly and effectively avoid the air backflow containing impurities in the vacuum drying process, and is easy to operate.

Description of drawings:

Figure 1 is a schematic diagram of the appearance of the integrated connector of the SF6 equipment charger and discharger.

Accompanying drawing 2 is a schematic diagram of the internal structure of the SF6 integrated block.

Detailed ways:

Below in conjunction with the accompanying drawings, the utility model is further described. The manifold (10) of the utility model is made of the following ratio of 180×65×45 square iron, and a plurality of air passages are preset inside as required, and a one-way check valve (1) A spring, a sealed steel ball and a ball holder are assembled in the reserved hole of the manifold (10), on the outside of the one-way check valve (1), a pipe joint (8) connected to the vacuum pump is installed; connected to the vacuum gauge (5) There is a switching valve (3) between the SF6 density meter (4), which are all installed on the upper plane of the manifold (10); the SF6 gas charging pipe joint (9) and the needle regulating valve (2) are installed On the airway, the valve handle is on the side; the gate valve (6) is installed on the airway leading to the equipment, and is externally connected to the SF6 recovery pipe joint (11); the pipe joint (7) connected to the electrical equipment is installed on the other end of the manifold (10) .

Specific operation method:

1. Operation of SF6 recovery: the needle regulating valve (2) and the one-way check valve (1) are closed, the gate valve (6) is opened, the recovery device is started, and the switching valve (3) is turned to one side of the SF6 density meter (4). side, monitor the residual SF6 pressure inside the equipment;

2. During vacuum extraction, the gate valve (6) and the needle regulating valve (2) are in the closed state, and the one-way check valve (1) is only opened to the vacuum pump side. As long as the vacuum pump stops, the one-way check valve (1) ) closes instantly to prevent backflow of air. The switch valve (3) is turned to the vacuum gauge (5) to monitor the vacuum degree at any time;

3. The operation of charging SF6 gas into the equipment: close the gate valve (6), turn the switch valve (3) to the SF6 density meter (4) to observe the inflation pressure at any time, and rotate the needle-shaped regulating valve (2) to adjust the intake volume of SF6 gas.

Claims (2)

1, a kind of multi-functional SF6 electric equipment charges and discharge the integrated joint of gas, be included in and preset air flue in the integrated package, formation is combined in unidirectional non-return valve (1), aciculiform adjuster valve (2), gate valve (6), switching valve (3), vacuum meter (5), SF6 density meter (4) and three pipe joints (8), it is characterized in that, multiple function combinations constitutes multi-functional SF6 electric equipment and charges and discharge the integrated joint of gas together.

2, according to claim 1, a kind of multi-functional SF6 electric equipment charges and discharge the integrated joint of gas, it is characterized in that: integrated package (10) is many air flues of internal preset as required, unidirectional non-return valve (1) is by spring, sealed steel ball and ball holder are assembled in the hole of integrated package (10) reservation, unidirectional non-return valve (1) outside, installing connects the pipe joint (8) of vacuum pump; Connecting between vacuum meter (5), the SF6 density meter (4) has switching valve (3), is installed in the last plane of integrated package (10); SF6 gas ducting joint (9) is installed on same air flue with aciculiform adjuster valve (2), and valve handle is in the side; Gate valve (6) is installed on the air flue that leads to equipment, external SF6 recovery channel joint (11); The pipe joint that links to each other with electric equipment (7) is contained in integrated package (10) other end.

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