CN106799174A - A kind of SF6 and N2 gases mixing apparatus and inflation method - Google Patents

Abstract

The present invention relates to high-tension apparatus and gas insulating material technical field; refer in particular to a kind of SF6 and N2 gases mixing apparatus and inflation method; including protective housing; protective housing is respectively arranged at two ends with connecting element; stop groove and support are fixed with protective housing inwall; support is provided with rotating element, and protective housing one end is connected on mixed gas inflation air-channel system, and the protective housing other end is connected on air insulating device.The present apparatus is directly mounted on mixed gas inflation air-channel system, and mixed gas inflation gas circuit system architecture and function, safety and reliability are not changed；The characteristics of present apparatus has concise, flexible, practical, carries out straightway testing or application by mixed gas inflation is capable of achieving air insulating device without standing, with engineering practical value higher using the present apparatus.

Description

A kind of SF6 and N2 gas rapid mixing device and inflation method

technical field

The invention relates to the technical field of high-voltage equipment and gas insulating materials, in particular to a rapid mixing device and an inflation method for SF6 and N2 gas.

Background technique

SF6 gas has excellent electrical insulation strength and is widely used in high-voltage electrical equipment in power systems, but its temperature effect is too strong, so the use of SF6 gas should be reduced. With the gradual use of SF6 and N2 mixed gas in gas-insulated equipment (such as GIS, GIL), the practical engineering problems that need to be solved in engineering applications of SF6 and N2 mixed gas are becoming more and more obvious. For example, the insulation performance of mixed gas is currently being studied at home and abroad. At this time, the method of filling SF6 first and then N2 is still used. At this time, there are disadvantages such as low inflation efficiency and easy mixing of moisture in the air. In specific engineering applications, the pure gas needs to be charged for about 30 minutes to allow the gas inside the cavity to reach a steady state, and the mixed gas needs to be allowed to stand for at least 24 hours before the test can be carried out, which affects the progress of the project. Therefore, the rapid mixing of SF6 and N2 gas is studied. The device and its method are very important for the experimental research and engineering application of the mixed gas insulation performance.

Contents of the invention

In view of the above problems, the present invention provides a fast mixing device and inflation method for SF6 and N2 gas, which can quickly and effectively control the uniformity of the mixed gas of SF6 and N2, realize the uniform dispersion of SF6 and N2 molecules, and provide a mixture of SF6 and N2 gas The experimental research and engineering application save time and cost.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A rapid mixing device for SF6 and N2 gas, comprising a protective shell, connecting elements are respectively arranged at both ends of the protective shell, a blocking groove and a bracket are fixed on the inner wall of the protective shell, a rotating element is arranged on the bracket, and one end of the protective shell is It is connected to the mixed gas inflatable gas circuit system, and the other end of the protective shell is connected to the gas insulation equipment.

Further, the connecting element adopts a movable interface, and the connecting element includes a connecting element 1 and a connecting element 2, the connecting element 1 and the connecting element 2 are symmetrically arranged at both ends of the protective shell, and the connecting element 1 is connected to the mixed gas inflator. On the circuit system, connecting element two is connected to the gas-insulated equipment.

Further, the mixed gas inflation gas system includes SF6 gas path interface, N2 gas path interface, gas insulation equipment interface, vacuum pump interface, SF6 gas path control valve, N2 gas path control valve, gas insulation equipment inflation control valve and Vacuum pump valve, SF6 gas path interface is connected with SF6 gas input pipe, N2 gas path interface is connected with N2 gas input pipe, gas insulation equipment interface is connected with connection element 1, vacuum pump interface is connected with vacuum pump, SF6 gas path control valve and SF6 gas path Corresponding settings for the interface, corresponding settings for the N2 gas path control valve and the N2 gas path interface, corresponding settings for the gas-insulated equipment inflation control valve and the corresponding setting for the gas-insulated equipment interface, and corresponding settings for the vacuum pump valve and the vacuum pump interface.

Further, the rotating element includes a fan blade and a rotating shaft, the fan blade is fixed on the rotating shaft, and can rotate in the circumferential direction of the rotating shaft, the fan blade is made of light aluminum alloy, and the rotating shaft is made of smooth surface metal cylinder.

Further, the blocking groove is made of metal material to form a groove-shaped structure, and the blocking groove and the connecting element are not on the same plane.

Furthermore, the protective shell is made of metal material into a spherical structure.

A method for charging SF6 and N2 gas fast mixing device, characterized in that the steps are as follows:

Step 1, connect the connection element 1 to the gas insulation equipment interface of the mixed gas inflating gas circuit system, and connect the connection element 2 to the gas insulation equipment;

Step 2, close the SF6 gas path control valve and the N2 gas path control valve, open the gas insulation equipment inflation control valve and the vacuum pump valve, start the vacuum pump for vacuuming, and continue pumping for a period of time to ensure that the test chamber and the gas path are fully vacuumed;

Step 3: After vacuuming, close the gas-insulated equipment inflation control valve and vacuum pump valve in turn, then open the SF6 gas path control valve and N2 gas path control valve in turn, and then open the gas-insulation equipment inflation control valve, at this time SF6 gas and N2 The gas flows into the SF6 and N2 gas rapid mixing device according to a certain ratio and flow rate;

Step 4, due to the pressure difference between the gas insulation equipment and the SF6 gas circuit and the N2 gas circuit, when the SF6 gas and N2 gas flow into the SF6 and N2 gas rapid mixing device, the rotating element 4 starts to rotate, so that the SF6 gas and N2 gas After the molecules are evenly mixed, they enter the interior of the gas insulation equipment;

Step 5, when the gas-insulated equipment reaches the preset total pressure, close the gas-insulated equipment inflatable control valve, SF6 gas path control valve and N2 gas path control valve in sequence, disconnect the connecting element 1 and connecting element 2, and remove SF6 and N2 The gas rapid mixing device completes the charging process of a specific ratio of SF6 and N2 mixed gas.

Beneficial effects of the present invention:

1. This device is directly installed on the mixed gas inflatable gas circuit system without changing the structure and function of the mixed gas inflated gas circuit system, which is safer and more reliable;

2. The rotating element automatically operates through the pressure difference between the two ends, without adding a complicated control system, which effectively reduces the cost;

3. The blocking groove realizes the storage of particulate impurities inside the device, effectively avoiding the entry of particulate impurities into the gas insulation device and affecting the electrical performance of the gas insulation device;

4. This device has the characteristics of simplicity, flexibility and practicality. Using this device to inflate the mixed gas can realize the direct test or application of the gas insulation equipment without standing still, and has high engineering practical value.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is a schematic diagram of the present invention applied to the gas circuit system of mixed gas inflation.

1. Connecting element 1; 2. Protective shell; 3. Blocking groove; 4. Rotating element; 5. Bracket; 6. Connecting element 2; 7. Wind blade; 8. Rotating shaft; .N2 gas path interface; 11. Gas insulation equipment interface; 12. Vacuum pump interface; 13. SF6 gas path control valve; 14. N2 gas path control valve; 15. Gas insulation equipment inflation control valve; 16. Vacuum pump valve.

detailed description

The technical solutions of the present invention will be described below in conjunction with the drawings and embodiments.

As shown in Fig. 1 and Fig. 2, a kind of SF6 and N2 gas rapid mixing device of the present invention comprises a protective shell 2, the two ends of the protective shell 2 are respectively provided with connecting elements, and the inner wall of the protective shell 2 is fixed with The blocking groove 3 and the bracket 5 are provided with a rotating element 4, one end of the protective shell 2 is connected to the mixed gas inflating gas circuit system, and the other end of the protective shell 2 is connected to the gas insulation equipment. The above constitutes the basic structure of the present invention.

In the present invention, one end of the protective shell 1 is connected to the component and directly installed on the mixed gas inflatable gas circuit system, and the other end is connected to the gas insulation equipment, without changing the structure and function of the mixed gas inflated gas circuit system, which is safe and reliable, and the rotating element 4 The bracket 5 is fixed inside the protective shell 1, and the rotating element 4 automatically operates through the pressure difference between the mixed gas inflating gas circuit system and the gas insulation equipment, without adding a complicated control system, which effectively reduces the cost. The blocking groove 3 is fixed on the Protecting the inside of the housing 1, its function is to store particulate impurities inside the device, effectively preventing particulate impurities from entering the gas insulation device and affecting the electrical performance of the gas insulation device. The present invention has the characteristics of simplicity, flexibility and practicality. Using this Inflating the device with mixed gas can realize the direct test or application of gas-insulated equipment without standing still, and has high engineering practical value.

More specifically, the connecting element adopts a movable interface, and the connecting element includes connecting element one 1 and connecting element two 6. 1 is connected to the mixed gas inflating gas circuit system, and connecting element 2 6 is connected to the gas insulation equipment. Preferably, the connecting element can be a self-sealing quick connector or a threaded union. When in use, it can be directly installed on the mixed gas charging gas system to ensure that the mixed gas charging gas system flows through the SF6 and N2 gas rapid mixing device. No leakage, and at the same time, it is easy to disassemble and separate from the mixed gas charging system.

More specifically, the mixed gas inflating gas circuit system includes SF6 gas circuit interface 9, N2 gas circuit interface 10, gas insulation equipment interface 11, vacuum pump interface 12, SF6 gas circuit control valve 13, N2 gas circuit control valve 14, Inflatable control valve 15 of gas insulation equipment and vacuum pump valve 16, SF6 gas path interface 9 is connected with SF6 gas input pipe, N2 gas path interface 10 is connected with N2 gas input pipe, gas insulation equipment interface 11 is connected with connection element 1, vacuum pump interface 12 is connected with a vacuum pump, the SF6 gas path control valve 13 is set correspondingly to the SF6 gas path interface 9, the N2 gas path control valve 14 is set correspondingly to the N2 gas path interface 10, and the gas-insulated equipment inflation control valve 15 is set correspondingly to the gas-insulated equipment interface 11 , the vacuum pump valve 16 is set corresponding to the vacuum pump interface 12 . With such a structural setting, the SF6 gas path control valve 13 controls the closing of the SF6 gas path interface 9, the N2 gas path control valve 14 controls the closing of the N2 gas path interface 10, and the gas insulation equipment inflation control valve 15 controls the gas insulation equipment. The closing of the interface 11 controls the closing of the vacuum pump interface 12 through the vacuum pump valve 16 .

More specifically, the rotating element 4 includes a fan blade 7 and a rotating shaft 8, the fan blade 7 is fixed on the rotating shaft 8, and can rotate in the circumferential direction of the rotating shaft 8, and the fan blade 7 is made of light aluminum alloy , the number of leaves is preferably 2-6. The rotating shaft 8 adopts a metal cylinder with a smooth surface. The rotating element 4 is fixed inside the protective casing 2 through the bracket 5 .

More specifically, the blocking groove 3 is made of metal material into a groove-shaped or "C"-shaped structure, and the blocking groove 3 and the connecting element are not on the same plane. Preferably, the blocking groove 3 is rigidly connected or welded to the inner wall of the protective shell 2, and is used to block or filter particulate impurities from flowing out of the SF6 and N2 gas rapid mixing device.

More specifically, the protective shell 2 is made of metal material into a spherical or ellipsoidal structure. Preferably, the protective shell 2 has a certain thickness, hardness and rigidity, and protects the internal barrier groove 3, the rotating element 4 and the bracket 5 from external mechanical damage and environmental corrosion.

A kind of filling method of SF6 and N2 gas rapid mixing device, the steps are as follows:

Step 1, connect the connection element 1 to the gas insulation equipment interface 11 of the mixed gas inflating gas circuit system, and connect the connection element 2 6 to the gas insulation equipment;

Step 2, close the SF6 gas path control valve 13 and the N2 gas path control valve 14, open the gas insulation equipment inflation control valve 15 and the vacuum pump valve 16, start the vacuum pump for vacuuming, and continue pumping for a period of time to ensure that the test chamber and the gas path are fully filled. Vacuum;

Step 3: After vacuuming, close the gas-insulated equipment inflation control valve 15 and vacuum pump valve 16 in sequence, then open the SF6 gas path control valve 13 and the N2 gas path control valve 14 in turn, and then open the gas-insulated equipment inflation control valve 15. At the same time, SF6 gas and N2 gas flow into the SF6 and N2 gas rapid mixing device according to a certain ratio and flow rate;

Step 4, due to the pressure difference between the gas insulation equipment and the SF6 gas circuit and the N2 gas circuit, when the SF6 gas and N2 gas flow into the SF6 and N2 gas rapid mixing device, the rotating element 4 starts to rotate, so that the SF6 gas and N2 gas After the molecules are evenly mixed, they enter the interior of the gas insulation equipment;

Step 5, when the gas-insulated equipment reaches the preset total pressure, close the gas-insulated equipment inflatable control valve 15, the SF6 gas path control valve 13 and the N2 gas path control valve 14 in sequence, disconnect the connecting element 1 and the connecting element 2 6, Remove the SF6 and N2 gas rapid mixing device, remove the filter particle impurities in the barrier tank 3, and complete the gas charging process of the specific ratio of SF6 and N2 gas mixture.

The embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments, which are only illustrative, rather than restrictive, and those of ordinary skill in the art will Under the enlightenment of the present invention, many forms can also be made without departing from the gist of the present invention and the protection scope of the claims, and these all belong to the protection scope of the present invention.

Claims (7)

1. A kind of SF6 and N2 gas fast mixing device, it is characterized in that: comprise protective shell (2), described protective shell (2) two ends are respectively provided with connecting element, on the described protective shell (2) inner wall A blocking groove (3) and a bracket (5) are fixedly provided, and a rotating element (4) is provided on the bracket (5). The other end of the protective casing (2) is connected to the gas insulation equipment. 2. A fast mixing device for SF6 and N2 gas according to claim 1, characterized in that: the connecting element adopts a movable interface, and the connecting element includes connecting element one (1) and connecting element two (6) , the first connecting element (1) and the second connecting element (6) are symmetrically arranged at both ends of the protective shell (2), the first connecting element (1) is connected to the mixed gas inflating gas circuit system, the connecting Element two (6) is connected to the gas-insulated equipment. 3. A kind of SF6 and N2 gas rapid mixing device according to claim 2, characterized in that: said mixed gas charging gas circuit system includes SF6 gas circuit interface (9), N2 gas circuit interface (10), gas insulation Equipment interface (11), vacuum pump interface (12), SF6 gas path control valve (13), N2 gas path control valve (14), gas insulation equipment inflation control valve (15) and vacuum pump valve (16), the SF6 gas The gas path interface (9) is connected with an SF6 gas input pipe, the N2 gas path interface (10) is connected with an N2 gas input pipe, the gas insulation device interface (11) is connected to the connection element one (1), and the vacuum pump interface (12) A vacuum pump is connected, the SF6 gas path control valve (13) is set correspondingly to the SF6 gas path interface (9), and the N2 gas path control valve (14) is set correspondingly to the N2 gas path interface (10). The gas-insulated equipment inflation control valve (15) is set correspondingly to the gas-insulated equipment interface (11), and the vacuum pump valve (16) is set correspondingly to the vacuum pump interface (12). 4. A kind of SF6 and N2 gas quick mixing device according to claim 1, it is characterized in that: described rotating element (4) comprises fan blade (7) and rotating shaft (8), and described fan blade (7) It is fixed on the rotating shaft (8) and can rotate in the circumferential direction of the rotating shaft (8). The fan blade (7) is made of light aluminum alloy, and the rotating shaft (8) is made of metal with a smooth surface. cylinder. 5. A kind of SF6 according to claim 1 and N2 gas fast mixing device, it is characterized in that: described barrier groove (3) adopts metal material to make groove type or " C " type structure, described barrier groove ( 3) Not on the same plane as the connecting element. 6. A device for quickly mixing SF6 and N2 gas according to claim 1, characterized in that: the protective shell (2) is made of metal material into a spherical or ellipsoidal structure. 7. A method for filling SF6 and N2 gas fast mixing device, characterized in that, the steps are as follows: Step 1, connect the connection element one (1) to the gas insulation equipment interface (11) of the mixed gas inflating gas circuit system, and connect the connection element two (6) to the gas insulation equipment; Step 2, close the SF6 gas path control valve (13) and the N2 gas path control valve (14), open the gas insulation equipment inflation control valve (15) and the vacuum pump valve (16), start the vacuum pump for vacuuming, and continue pumping for a period of time, Ensure that the test chamber and gas path are fully evacuated; Step 3: After vacuuming, close the gas insulation equipment inflation control valve (15) and vacuum pump valve (16) in sequence, then open the SF6 gas path control valve (13) and N2 gas path control valve (14) in sequence, and then open the gas Insulation equipment inflation control valve (15), at this time SF6 gas and N2 gas flow into the SF6 and N2 gas rapid mixing device according to a certain ratio and flow rate; Step 4, due to the pressure difference between the gas insulation equipment and the SF6 gas circuit and the N2 gas circuit, when the SF6 gas and N2 gas flow into the SF6 and N2 gas rapid mixing device, the rotating element 4 starts to rotate, so that the SF6 gas and N2 gas After the molecules are evenly mixed, they enter the interior of the gas insulation equipment; Step 5, when the gas-insulated equipment reaches the preset total pressure, close the gas-insulated equipment inflation control valve (15), SF6 gas path control valve (13) and N2 gas path control valve (14) in sequence, and disconnect the connecting element one ( 1) Connect with component two (6), remove the SF6 and N2 gas rapid mixing device, and complete the inflation process of a specific ratio of SF6 and N2 mixed gas.