A gas generator for a high-voltage switch actuating mechanism

Abstract

The present invention relates to a gas generator of a high-voltage switch actuating mechanism, comprising a shell, a base is fixed on the top of the shell, an electric squib is arranged in the center of the base, the electric squib is fixed on the base by a fixing cover, a medicine cup is arranged below the base, the bottom of the medicine cup is evenly provided with a first exhaust hole along the circumference, an end cover is fixed on the bottom of the shell, a second exhaust hole is arranged in the center of the end cover, a mounting seat is arranged on the outside of the shell, the mounting seat is provided with an external thread, a first positioning boss is arranged in the center of the medicine cup, an ignition tube is installed on the first positioning boss, the side wall of the ignition tube is evenly provided with fire transfer holes, a pressure relief hole is arranged in the center of the first positioning boss, and a sealing foil is attached to one end of the pressure relief hole adjacent to the ignition tube. The present invention has the advantages of maintenance-free, reliable operation and fast response speed.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage and ultra-high-voltage power transmission and transformation switches, and in particular to a gas generator of a high-voltage switch actuating mechanism. Background Art

[0002] High-voltage and ultra-high-voltage switchgear are widely used in high-voltage or ultra-high-voltage power transmission and transformation systems such as power plants, national power grids, urban power grids, large industrial and mining enterprises, railway electricity and rural power supply. In the early days, the power source of the actuating mechanism of high-voltage or ultra-high-voltage switches with voltage levels of 220kV and above was mainly a hydraulic disc spring mechanism, which used a motor to slowly compress and store energy. The energy stored at one time was only enough to achieve three rapid opening and closing of the high-voltage switch, and the energy storage was slow, the structure was complex, and maintenance was difficult.

[0003] In view of the shortcomings of the above-mentioned high-voltage switch actuation mechanism, such as slow energy storage, complex structure, and difficult maintenance, Chinese Patent 201210405352.6 discloses a gas-type direct force-acting high-voltage switch actuation operating mechanism, which mainly includes a chamber body, a top cover, a piston rod, a closing gas generator, and an opening gas generator; the operating mechanism realizes bidirectional movement and multiple movements of the operating mechanism by installing the gas generator in two directions, and finally realizes multiple opening and closing of the high-voltage switch. In order to achieve the closing-opening-closing or opening-closing-opening connection action requirements of the high-voltage switch, the gas generator needs to be ignited according to the control sequence. The mechanism uses the high-pressure and high-speed gas generated by the gas generator as the direct driving force, which can meet the use requirements of reliable closing and opening of the high-voltage switch with fast response in milliseconds. At present, one of the methods to improve the driving force of the gas generator is to use an ignition powder with a higher burning rate. First of all, the problem of mixed loading of the ignition powder and the gas-producing powder needs to be solved. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art. The present invention provides a gas generator for a high-voltage switch actuating mechanism. By arranging an ignition tube in a medicine cup, placing the gas-producing powder in the medicine cup outside the ignition tube, and placing the ignition powder in the ignition tube, the problem of mixing the ignition powder and the gas-producing powder is avoided. In addition, a pressure relief hole is provided in the center of the medicine cup to avoid the ignition tube from rupturing due to a sudden increase in ignition pressure. A sealing foil is attached to one end of the pressure relief hole facing the ignition tube, so that the ignition pressure can be reliably established.

[0005] The present invention provides the following technical solutions:

[0006] A gas generator for a high-voltage switch actuating mechanism comprises a shell, a base is fixed on the top of the shell, an electric squib is arranged in the center of the base, the electric squib is fixed to the base by a fixing cover, a medicine cup is arranged below the base, the bottom of the medicine cup is evenly provided with first exhaust holes along the circumference, an end cover is fixed on the bottom of the shell, a second exhaust hole is arranged in the center of the end cover, a mounting seat is arranged on the outside of the shell, the mounting seat is provided with an external thread, a first positioning boss is arranged in the center of the medicine cup, an ignition tube is installed on the first positioning boss, fire transfer holes are evenly arranged on the side wall of the ignition tube, a pressure relief hole is arranged in the center of the first positioning boss, and a sealing foil is attached to the end of the pressure relief hole adjacent to the ignition tube.

[0007] Furthermore, a filter screen is provided above the end cover, the upper end of the end cover presses the filter screen, a first cylindrical buffer cavity is provided between the upper end surface of the filter screen and the medicine cup, and a second cylindrical buffer cavity is provided between the lower end surface of the filter screen and the second exhaust hole.

[0008] Furthermore, a sealing sheet is provided below the end cover, and third exhaust holes are evenly distributed along the circumference of the sealing sheet. A second positioning boss is provided on the inner side of the third exhaust hole, and a bonding groove is provided on the outer side of the second exhaust hole. The bonding groove is bonded to the second positioning boss through silicone rubber.

[0009] Furthermore, the bonding gap between the bonding groove and the second positioning boss is 0.2 mm to 0.3 mm.

[0010] Furthermore, the first exhaust hole is covered with a first annular screen, and the space between the top of the medicine cup and the ignition tube is covered with a second annular screen.

[0011] Furthermore, the shell, the base, the end cover and the sealing sheet form a cavity isolated from the outside.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. A pressure relief hole is designed inside the powder cup to adapt to ignition powder with a higher burning rate; a sealing foil is provided on the pressure relief hole to reliably establish ignition pressure and ensure ignition consistency.

[0014] 2. The filter is cylindrical, and cylindrical buffer cavities are designed on its front and rear end faces to provide a buffer space for high-pressure and high-speed airflow, which can prevent the accumulated airflow from penetrating the filter, making the woven and pressed filter suitable for high-pressure and high-speed airflow environment conditions.

[0015] 3. The sealing piece effectively seals the internal charge space of the gas generator, blocks the impact of the high temperature and high pressure airflow in the gas filling cavity on the internal structure and charge of the gas generator, enhances the anti-interference ability of the gas generator, and improves the working reliability and environmental adaptability of the gas generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of a gas flow path according to Embodiment 1 of the present invention;

[0018] Figure 3 This is a working schematic diagram of Embodiment 1 of the present invention;

[0019] Figure 4 This is a typical Pt curve diagram of the present invention after ignition in a 10L sealed container (23°C). DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Embodiment 1:

[0022] See also Figure 1 A gas generator of a high-voltage switch actuating mechanism of the present invention comprises a shell 3, a base 8 is fixed on the top of the shell, an electric squib 11 is arranged in the center of the base, the electric squib is fixed on the base by a fixing cover 9, a medicine cup 4 is arranged below the base, a first exhaust hole 4a1 is evenly distributed on the bottom of the medicine cup along the circumference, an end cover 1 is fixed on the bottom of the shell, a second exhaust hole is arranged in the center of the end cover, a mounting seat 3a1 is arranged on the outside of the shell, the mounting seat is provided with an external thread, a first positioning boss is arranged in the center of the medicine cup, an ignition tube 12 is installed on the first positioning boss, and fire transfer holes 12a1 are evenly distributed on the side wall of the ignition tube, a pressure relief hole 4a2 is arranged in the center of the first positioning boss, and a sealing foil 4a3 is attached to one end of the pressure relief hole adjacent to the ignition tube.

[0023] A filter screen 2 is provided above the end cover 1, and the upper end of the end cover presses the filter screen. A first cylindrical buffer cavity is provided between the upper end surface of the filter screen and the medicine cup, and a second cylindrical buffer cavity is provided between the lower end surface of the filter screen and the second exhaust hole. The filter screen 2 is cylindrical and is made of stainless steel wire weaving and pressing, and has high axial strength. The filter screen 2 is placed on the step at the lower part of the outer shell 3, and the end cover 1 is installed on the outer shell 3 in the form of a threaded connection and presses and fixes the filter screen 2. Buffer cavities are respectively provided on the two end surfaces of the filter screen, and the buffer cavities can effectively reduce the pressure difference at both ends of the filter screen and reduce the impact load borne by the filter screen. The buffer cavity provides a buffer space for high-pressure and high-speed airflow, avoids the accumulation of airflow and the breakdown or knocking off the filter screen, and can meet the use conditions of outputting a pressure of 2.2MPa within 7.2ms.

[0024] A sealing sheet 13 is provided below the end cover 1, and a third exhaust hole 13a1 is evenly distributed along the circumference of the sealing sheet. A second positioning boss 13a2 is provided on the inner side of the third exhaust hole, and a bonding groove 1a1 is provided on the outer side of the second exhaust hole. The bonding groove is bonded to the second positioning boss through silicone rubber 13a3. The problem of mutual influence between gas generators in the same cavity environment is solved, and misfire is prevented, and the high temperature impact on the gas generator is reduced. The bonding area and bonding thickness of the sealing sheet and the end cover affect the pressure loss of the gas generator when the seal is broken, and affect the consistency of the gas generator. The bonding area is kept consistent through the bonding surface of the bonding groove of the end cover and the second positioning boss of the sealing sheet; the bonding thickness is kept consistent through the assembly spacing of the bonding groove of the end cover and the second positioning boss of the sealing sheet; thereby solving the consistency problem of the sealing sheet breaking and improving the working consistency of the gas generator.

[0025] The bonding gap between the bonding groove 1a1 and the second positioning boss 13a2 is 0.2 mm to 0.3 mm, thereby ensuring the consistency of the debonding of the gas generator.

[0026] The first exhaust hole 4a1 is covered with a first annular screen 5 , and the top of the medicine cup 4 and the ignition tube 12 are covered with a second annular screen 10 .

[0027] The housing 3, the base 8, the end cover 1 and the sealing sheet 13 form a cavity isolated from the outside.

[0028] In this embodiment, the shell 3 is provided with an ignition chamber, a combustion chamber and a filter chamber. The ignition chamber is surrounded by the base 8, the ignition tube 12 and the first positioning boss of the medicine cup. The electric squib 11 is placed in the central hole of the base 8. The fixing cover 9 is installed on the base 8 in the form of a threaded connection and presses and fixes the electric squib 11. The sheet ignition powder 6 is placed in the ignition tube 12. The electric squib 11 is inserted into the end of the ignition tube 12 to form an independent ignition space. The side wall of the ignition tube is evenly distributed with fire transfer holes 12a1. The combustion chamber is surrounded by the inner wall of the medicine cup 4, the outer wall of the ignition tube 12, the first annular screen 5 and the second annular screen 10. The combustion chamber is filled with gas-producing medicine 7. The medicine cup is placed on the step in the shell. The first annular screen is placed at the bottom of the medicine cup and connected to the small step of the ignition tube. The second annular screen is placed at the top of the medicine cup and connected to the outer wall of the ignition tube and pressed on the surface of the gas-producing medicine. The first exhaust hole 4a1 is provided at the bottom of the medicine cup. The filter chamber contains a filter screen 2 placed on the step inside the shell 3, an end cap 1 mounted on the shell, and a sealing sheet 13 placed on the surface of the end cap. The sealing strength of the sealing foil 4a3 can help establish the ignition pressure in the ignition chamber to ensure ignition consistency. The pressure relief hole 4a2 at the bottom of the ignition tube 12 prevents the ignition pressure from rising suddenly and causing the ignition tube to rupture. The structure of the ignition tube can adapt to higher ignition pressure and meet the use conditions of more violent burning rate agents.

[0029] See also Figure 2 The present invention uses silicone rubber 13a3 to encapsulate the sealing piece 13. When the gas generator is working, the high-pressure and high-speed airflow rushes through the sealing piece 13, and the third exhaust hole 13a1 on the sealing piece 13 is relatively independent from the second exhaust hole of the end cover 1, and the airflow channel is unobstructed.

[0030] See also Figure 3 The gas generator is installed on the cavity wall, and the sealing sheet 13 effectively blocks the impact of high-temperature and high-pressure airflow on the inside of the gas generator. The sealing sheet 13 itself will not enter the cavity and will not produce excess matter in the cavity. The internal space of the gas generator is closed and independent, with a simple structure and no maintenance required.

[0031] See also Figure 4 The working process of the present invention is as follows: one or more gas generators are installed on the cavity wall, and upon receiving an ignition trigger signal, the electric squib works to ignite the ignition powder, and the ignition powder ignites the gas-producing powder while breaking through the sealing foil on the pressure relief hole. The gas-producing powder burns violently to generate high-pressure and high-speed airflow, which is filtered out by the filter screen, the end cover, and the sealing sheet into the cavity, providing millisecond-level actuating force for the high-voltage switch actuating mechanism.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A gas generator for a high-voltage switch actuating mechanism, comprising a housing (3), a base (8) being fixed on the top of the housing, an electric squib (11) being provided at the center of the base, the electric squib being fixed to the base by a fixing cover (9), a medicine cup (4) being provided below the base, the bottom of the medicine cup being provided with first exhaust holes (4a1) uniformly distributed along the circumference, an end cover (1) being fixed at the bottom of the housing, the center of the end cover being provided with a second exhaust hole, a mounting seat (3a1) being provided on the outside of the housing, the mounting seat being provided with an external thread, and characterized in that: A first positioning boss is provided at the center of the medicine cup, an ignition tube (12) is mounted on the first positioning boss, fire transfer holes (12a1) are evenly distributed on the side wall of the ignition tube, a pressure relief hole (4a2) is provided at the center of the first positioning boss, and a sealing foil (4a3) is attached to one end of the pressure relief hole adjacent to the ignition tube; A filter screen (2) is provided above the end cover (1), the upper end of the end cover presses the filter screen tightly, a first cylindrical buffer cavity is provided between the upper end surface of the filter screen and the medicine cup, and a second cylindrical buffer cavity is provided between the lower end surface of the filter screen and the second exhaust hole; A sealing sheet (13) is provided below the end cover (1), and third exhaust holes (13a1) are evenly distributed along the circumference of the sealing sheet. A second positioning boss (13a2) is provided on the inner side of the third exhaust hole, and a bonding groove (1a1) is provided on the outer side of the second exhaust hole. The bonding groove is bonded to the second positioning boss via silicone rubber (13a3); The bonding gap between the bonding groove (1a1) and the second positioning boss (13a2) is 0.2 mm to 0.3 mm; The first exhaust hole (4a1) is covered with a first annular screen (5), and a second annular screen (10) is covered between the top of the medicine cup (4) and the ignition tube (12).

2. A gas generator for a high-voltage switch actuating mechanism according to claim 1, characterized in that: The housing (3), the base (8), the end cover (1) and the sealing sheet (13) form a cavity isolated from the outside world.

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