阅读说明：本技术 一种高功率气体开关密封连接结构 (High-power gas switch sealing connection structure ) 是由 王弘刚 洪志强 周豪 谭跃飞 黄程芳 彭海钦 谢晖 文艳凤 周柏林 于 2020-06-24 设计创作，主要内容包括：本发明提出了一种高功率气体开关密封连接结构,包括外壳、外壳底盖板、外壳顶盖板和气体开关,所述外壳底盖板固定于外壳的底部,所述外壳顶盖板固定于外壳的顶部,所述外壳、外壳底盖板和外壳顶盖板共同组成密封体,所述气体开关置于所述密封体内,所述气体开关的底部开设有第一通孔,所述外壳底盖板上与第一通孔同心处开设有第二通孔,气嘴依次穿过第二通孔和第一通孔与气体开关固定连接,所述气体开关与气嘴的接触面设置有密封圈,压环套设于气嘴上,并通过紧固件固定于所述外壳底盖板的底部。本发明通过增设密封圈、压环和紧固件实现了气嘴轴向和径向相结合的双向密封,具有结构简单、密封性好且节省成本的优点。(The invention provides a high-power gas switch sealing connection structure which comprises a shell, a shell bottom cover plate, a shell top cover plate and a gas switch, wherein the shell bottom cover plate is fixed at the bottom of the shell, the shell top cover plate is fixed at the top of the shell, the shell bottom cover plate and the shell top cover plate jointly form a sealing body, the gas switch is arranged in the sealing body, a first through hole is formed in the bottom of the gas switch, a second through hole is formed in the position, concentric with the first through hole, of the shell bottom cover plate, a gas nozzle sequentially penetrates through the second through hole and the first through hole to be fixedly connected with the gas switch, a sealing ring is arranged on the contact surface of the gas switch and the gas nozzle, and a pressing ring is sleeved on the gas nozzle and fixed at the bottom of the shell. The invention realizes the axial and radial combined bidirectional sealing of the air tap by additionally arranging the sealing ring, the pressing ring and the fastener, and has the advantages of simple structure, good sealing performance and cost saving.)

1. The utility model provides a high power gas switch sealing connection structure, includes shell (6), shell bottom plate (1), shell lamina tecti (7) and gas switch (2), shell bottom plate (1) is fixed in the bottom of shell (6), shell lamina tecti (7) are fixed in the top of shell (6), shell bottom plate (1) and shell lamina tecti (7) constitute the seal jointly, gas switch (2) are arranged in the seal, its characterized in that, first through-hole has been seted up to the bottom of gas switch (2), the second through-hole has been seted up with first through-hole heart department on shell bottom plate (1), gas cock (3) passes second through-hole and first through-hole and gas switch (2) fixed connection in proper order, the contact surface of gas switch (2) and gas cock (3) is provided with the sealing washer, the air tap (3) is sleeved with the compression ring (4), and the compression ring is fixed at the bottom of the shell bottom cover plate (1) through a fastener.

2. The high-power gas switch sealing connection structure according to claim 1, wherein the pressure ring (4) is provided with an annular boss coaxial therewith, the bottom of the housing bottom cover plate (1) is provided with a first annular groove matched with the annular boss, and the annular boss is arranged in the first annular groove.

3. The high power gas switch sealing connection structure of claim 2, wherein the depth of the first annular groove is greater than the height of the annular boss, and the inner diameter of the first annular groove is consistent with the outer diameter of the sealing ring.

4. The high-power gas switch sealing connection structure according to claim 3, wherein the outer diameter of the annular boss is smaller than the outer diameter of the pressure ring (4), and the inner diameter of the annular boss is the same as the aperture of the second through hole.

5. The high-power gas switch sealing connection structure according to claim 4, wherein the radial distance between the outer diameter of the annular boss and the inner diameter of the first annular groove is equal to the radial distance between the inner diameter of the annular boss and the outer diameter of the gas nipple (3).

6. The high-power gas switch sealing connection structure according to claim 1, wherein the gas nipple (3) is provided with a second annular groove matched with a sealing ring, and the sealing ring is arranged in the second annular groove.

7. The high-power gas switch sealing connection structure according to any one of claims 2-6, wherein the fastener is a bolt (5), a third through hole is formed in the pressure ring (4), a threaded blind hole matched with the bolt (5) is formed in the position, corresponding to the third through hole, of the bottom of the housing bottom cover plate (1), and the bolt (5) fixedly connects the pressure ring (4) with the housing bottom cover plate (1) through the third through hole and the threaded blind hole.

8. The high power gas switch sealing connection according to claim 7, characterized in that the number of bolts (5) is at least four.

9. The high-power gas switch sealing connection structure according to claim 1, characterized in that the gas switch (2) is made of high-strength insulating material.

10. The high power gas switch sealing connection structure of claim 1, wherein the first through hole is a threaded hole.

Technical Field

The invention relates to the technical field of switch sealing, in particular to a high-power gas switch sealing connection structure.

Background

Gas spark switches have found a great number of applications in the field of high voltage pulse power technology. As an important pulse modulation technique, Marx (pulse modulation technique) uses a multi-stage spark switch, and an insulated colloid gas pipe is often used for connection between a gas switch and a shell or directly penetrates through the shell to be connected to an external gas cylinder or other devices. As shown in fig. 1, that is, the gas switch 2 and the housing 6 are connected by the insulating colloid gas pipe 8, in this way, the application time is not long, generally not more than one year, and the application requirement can be met under the condition that the use frequency of the gas switch is not high. However, in the industrial application process of Marx, when the gas switch is frequently used for a long time or stored for a long time, sulfur hexafluoride gas inside the switch generates a sulfide product after being subjected to high-voltage electric shock, the sulfide product corrodes the gas pipe, the gas pipe becomes brittle, aged and damaged, and gas leakage is caused. Therefore, the sealing method through the air pipe connection cannot meet the requirements of long-time use and storage.

Disclosure of Invention

In view of this, the invention provides a high-power gas switch sealing connection structure, so as to meet the design requirements of reliable sealing of the switch and convenient pipeline maintenance when the switch is used or stored for a long time.

In order to achieve the purpose, the technical scheme of the invention is realized as follows: the invention provides a high-power gas switch sealing connection structure which comprises a shell, a shell bottom cover plate, a shell top cover plate and a gas switch, wherein the shell bottom cover plate is fixed at the bottom of the shell, the shell top cover plate is fixed at the top of the shell, the shell bottom cover plate and the shell top cover plate jointly form a sealing body, the gas switch is arranged in the sealing body, a first through hole is formed in the bottom of the gas switch, a second through hole is formed in the position, concentric with the first through hole, of the shell bottom cover plate, a gas nozzle sequentially penetrates through the second through hole and the first through hole to be fixedly connected with the gas switch, a sealing ring is arranged on the contact surface of the gas switch and the gas nozzle, and a pressing ring is sleeved on the gas nozzle and fixed at the bottom of the shell.

Furthermore, the compression ring is provided with an annular boss coaxial with the compression ring, the bottom of the shell bottom cover plate is provided with a first annular groove matched with the annular boss, and the annular boss is arranged in the first annular groove.

Furthermore, the depth of the first annular groove is larger than the height of the annular boss, and the inner diameter of the first annular groove is consistent with the outer diameter of the sealing ring in size.

Further, the outer diameter of the annular boss is smaller than that of the pressing ring, and the inner diameter of the annular boss is the same as the aperture of the second through hole.

Further, the radial distance between the outer diameter of the annular boss and the inner diameter of the first annular groove is equal to the radial distance between the inner diameter of the annular boss and the outer diameter of the air tap.

Furthermore, be equipped with on the air cock with sealing washer assorted second annular groove, the sealing washer set up in the second annular groove.

Further, the fastener is a bolt, a third through hole is formed in the compression ring, a threaded blind hole matched with the bolt is formed in the position, corresponding to the third through hole, of the bottom of the shell bottom cover plate, and the compression ring is fixedly connected with the shell bottom cover plate through the third through hole and the threaded blind hole.

Further, the number of the bolts is at least four.

Furthermore, the gas switch is made of high-strength insulating materials.

Further, the first through hole is a threaded hole.

Compare prior art, the high power gas switch sealing connection structure of above-mentioned structure has following advantage:

1) the gas tap is axially and radially combined to form bidirectional sealing by additionally arranging the sealing ring, the pressing ring and the fastener, so that the internal gas pressure of the gas switch is sealed, the shell gas pressure is also sealed, and the sealing effect is good;

2) the gas switch can prevent the shell from being inflated so as to avoid the phenomenon that gas leaks from the gas switch due to the tensile force on the gas switch caused by the deformation of the bottom cover plate of the shell.

3) The gas switch and the externally connected gas pipe in the prior art are omitted, and the problem that gas leaks from the switch due to the fact that sulfur hexafluoride corrodes the gas pipe after being subjected to high-voltage electric shock when the gas switch repeatedly works for a long time and is stored for a long time is solved.

4) The sealing structure is simple, convenient to assemble and disassemble and good in sealing effect.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic cross-sectional view of a high power gas switch seal connection in the prior art;

fig. 2 is a schematic cross-sectional view of a high power gas switch sealing connection structure according to the present invention.

The corresponding relation of the reference numbers is as follows:

1-a housing bottom cover plate;

2-gas switch;

3-air tap;

4-pressing a ring;

5-bolt;

6-a housing;

7-a housing top cover plate;

8-colloid trachea.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In the description of the present invention, it is to be understood that the terms "top", "bottom", "inside", "outside", "upper", "lower", and the like, indicate orientations and positional relationships based on those shown in the drawings, are used only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the scope of the present invention.

Referring to fig. 2, a high-power gas switch sealing connection structure comprises a housing 6, a housing bottom cover plate 1, a housing top cover plate 7, a gas switch 2 and a gas nozzle 3, wherein the housing bottom cover plate 1 is fixed at the bottom of the housing 6, the housing top cover plate 7 is fixed at the top of the housing 6, the housing bottom cover plate 1 and the housing top cover plate 7 jointly form a sealing body, the gas switch 2 is arranged in the sealing body, a first through hole is formed at the bottom of the gas switch 2, the first through hole is preferably a threaded hole, a second through hole is formed in the housing bottom cover plate 1 at the position concentric with the first through hole, the gas nozzle 3 sequentially passes through the second through hole and the first through hole to be fixedly connected with the gas switch 2 (namely, the threaded hole is screwed with a designed gas nozzle 3), a sealing ring is arranged on a contact surface between the gas switch 2 and the gas nozzle 3, a pressing ring 4 is, clamping ring 4 and shell bottom shroud 1 pass through the fastener fixed for the sealing washer produces the pretightning force, and the sealing washer is through the extrusion, thereby makes 3 axial of air cock and radially all reach sealed effect, realizes axial and radial combination seal promptly. Preferably, the seal ring is an O-ring seal. Through the aforesaid setting, when equipment operation, the naked hourglass outside of gas switch 2 (be 6 insides of shell promptly) need fill insulating gas, when atmospheric pressure rises, shell bottom plate 1 can produce deformation, and gas switch 2 is immovable, air cock 3 of being connected with gas switch 2 can produce a tensile force, and air cock 3 only has the radial frictional force of an O type sealing washer, this frictional force is less than the tensile force, air cock 3 can be along with the linkage of gas switch 2, thereby make gas switch 2 have certain mobility and do not influence sealing performance relative shell bottom plate 1, prevent that shell bottom plate 1 from warping and dragging gas switch 2, the mobility sealing connection function of the switch body has just so been realized.

In a further technical scheme, in order to enable the sealing ring to generate pretightening force better, an annular boss coaxial with the sealing ring is arranged on the sealing ring 4, the outer diameter of the annular boss is smaller than that of the sealing ring 4, the inner diameter of the annular boss is the same as that of the second through hole, the radial distance between the outer diameter of the annular boss and the inner diameter of the first annular groove is equal to that between the inner diameter of the annular boss and the outer diameter of the air tap 3, a first annular groove matched with the annular boss is arranged at the bottom of the shell bottom cover plate 1, the annular boss is arranged in the first annular groove, the depth of the first annular groove is larger than the height of the annular boss, and the inner diameter of the first annular groove is consistent with the outer diameter of the sealing. It should be noted that, in the present invention, the specific depth of the first annular groove is determined according to the height of the annular boss and the compression ratio of the O-ring. Preferably, in the embodiment shown in fig. 2, the outer diameter of the second through hole is 0.5mm larger than the outer diameter of the gas nipple 3, the inner diameter of the annular boss is 0.5mm larger than the outer diameter of the gas nipple 3, and the outer diameter of the annular boss is 0.5mm smaller than the inner diameter of the first annular groove.

As shown in fig. 2, the fastening member is preferably a bolt 5, a third through hole is formed in the pressing ring 4, a threaded blind hole matched with the bolt 5 is formed in a position, corresponding to the third through hole, of the bottom of the casing bottom cover plate 1, the bolt 5 fixedly connects the pressing ring 4 and the casing bottom cover plate 1 through the third through hole and the threaded blind hole, so that the annular boss is prevented from being blown out of the first annular groove in the casing bottom cover plate 1, and preferably, the third through hole is a threaded hole. Note that the number of the bolts 5 is at least four. In the embodiment shown in fig. 2, the number of the bolts 5 is preferably four, and four bolts 5 are distributed on the same circumference of the pressing ring 4 at equal intervals.

It should be mentioned that the air faucet 3 is provided with a second annular groove matched with the sealing ring, and the sealing ring is arranged in the second annular groove.

Meanwhile, in order to meet the pressure-resistant requirement of the gas switch body, the gas switch 2 is preferably made of a high-strength insulating material, such as nylon, and other parts can be selected according to the requirement, so that the pressure-resistant and strength requirements can be met.

In summary, in the preferred embodiment shown in fig. 2 of the present invention, first, a threaded hole is formed at the bottom of the gas switch 2 for facilitating connection with the designed gas nozzle 3, and a second annular groove is formed on a contact surface of the gas nozzle 3 and the gas switch 2 for mounting an O-ring; then, a second through hole which is 0.5mm larger than the outer diameter of the air tap is formed in the position, concentric with the threaded hole, of the shell bottom cover plate 1, the second through hole is used for the air tap 3 to penetrate through, a first annular groove which is consistent with the outer diameter of the O-shaped sealing ring in size is designed on the outer side face of the second through hole in the shell bottom cover plate 1, and the first annular groove and the second through hole are coaxially arranged; then, a pressure ring 4 with an inner diameter 0.5mm larger than the air faucet and an outer diameter 0.5mm smaller than the inner diameter of the first annular groove is designed, it should be noted that the specific depth of the first annular groove is determined according to the annular height of the pressure ring 4 and the compression ratio of the O-shaped sealing ring, the pressure ring 4 is sleeved on the air faucet 3, a third through hole is formed in the pressure ring 4, a threaded blind hole is formed in the position corresponding to the bottom of the shell bottom cover plate 1, the pressure ring 4 and the shell bottom cover plate 1 are screwed up through a bolt 5, so that the O-shaped sealing ring generates a pre-tightening force, and the O-shaped sealing ring is extruded, so that the air faucet 3 can achieve a sealing effect in the axial direction and the radial direction. When the shell 6 is internally inflated, the shell bottom cover plate 1 and the shell top cover plate 7 can generate outward deformation, the position of the gas switch 2 is fixedly connected with other parts, so that the shell bottom cover plate 1 can generate downward pulling force on the gas nozzle 3, only one friction force of an O-shaped sealing ring exists between the gas nozzle 3 and the shell bottom cover plate 1, the friction force is far smaller than the pulling force, the gas switch 2 is connected with the gas nozzle 3 and can be dislocated with the shell bottom cover plate 1 in the vertical direction, the gas nozzle 3 is always stressed by the extrusion pretightening force of the O-shaped sealing ring, and the sealing performance of the shell 6 and the gas switch 2 is ensured.

In a word, the bottom of the gas switch 2 is provided with a first through hole, the position on the shell bottom cover plate 1, which is concentric with the first through hole, is provided with a second through hole, the gas nozzle 3 sequentially passes through the second through hole and the first through hole to be fixedly connected with the gas switch 2, the contact surface of the gas switch 2 and the gas nozzle 3 is provided with a sealing ring, and the pressing ring 4 is sleeved on the gas nozzle 3 and is fixed at the bottom of the shell bottom cover plate 1 through a fastening piece, so that long-time use and storage can be realized.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.