A sealed connection structure for high power gas switch

Abstract

The present invention proposes a high-power gas switch sealing connection structure, including a shell, a shell bottom cover plate, a shell top cover plate and a gas switch, wherein the shell bottom cover plate is fixed to the bottom of the shell, the shell top cover plate is fixed to the top of the shell, the shell, the shell bottom cover plate and the shell top cover plate together constitute a sealing body, the gas switch is placed in the sealing body, a first through hole is provided at the bottom of the gas switch, a second through hole is provided in the shell bottom cover plate at a position concentric with the first through hole, the gas nozzle passes through the second through hole and the first through hole in sequence and is fixedly connected to the gas switch, a sealing ring is provided on the contact surface between the gas switch and the gas nozzle, a pressure ring is sleeved on the gas nozzle, and is fixed to the bottom of the shell bottom cover plate by a fastener. The present invention realizes a two-way sealing of the gas nozzle in a combined axial and radial direction by adding a sealing ring, a pressure ring and a fastener, and has the advantages of simple structure, good sealing and cost saving.

Description

Technical Field

[0001] The invention relates to the technical field of switch sealing, and in particular to a sealing connection structure of a high-power gas switch. Background Art

[0002] In the field of high voltage pulse power technology, gas spark switches have been widely used. Marx (pulse modulation technology) is an important pulse modulation technology that uses multi-stage spark switches. The gas switch and the shell are often connected by an insulated colloid gas pipe or directly connected to an external gas cylinder or other equipment through the shell. Figure 1 As shown, the gas switch 2 and the housing 6 are connected by an insulating colloid-like air pipe 8. In this way of use, the application time is not long, generally not more than one year. When the frequency of use of the gas switch is not high, it can meet the application requirements. However, in the industrial application of Marx, when the gas switch is used frequently for a long time or stored for a long time, the sulfur hexafluoride gas inside the switch will be subjected to high-voltage electric shock. The sulfide products produced will corrode the air pipe, making the air pipe brittle, aged and damaged, resulting in leakage. In addition, if the air pipe is replaced regularly, the Marx device needs to be opened for maintenance, which is a lot of work. Therefore, this sealing method connected by the air pipe cannot meet the requirements of long-term use and storage. Summary of the invention

[0003] In view of this, the present invention proposes a sealed connection structure for a high-power gas switch to achieve the design requirements of reliable sealing of the switch and convenient pipeline maintenance when the switch is used or stored for a long time.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is implemented as follows: The present invention proposes a high-power gas switch sealing connection structure, including a shell, a shell bottom cover plate, a shell top cover plate and a gas switch, the shell bottom cover plate is fixed to the bottom of the shell, the shell top cover plate is fixed to the top of the shell, the shell, the shell bottom cover plate and the shell top cover plate together constitute a sealing body, the gas switch is placed in the sealing body, a first through hole is opened at the bottom of the gas switch, a second through hole is opened on the shell bottom cover plate at a position concentric with the first through hole, the gas nozzle passes through the second through hole and the first through hole in sequence and is fixedly connected to the gas switch, a sealing ring is provided on the contact surface between the gas switch and the gas nozzle, a pressure ring is sleeved on the gas nozzle, and is fixed to the bottom of the shell bottom cover plate by a fastener.

[0005] Furthermore, the pressure ring is provided with an annular boss coaxial therewith, and the bottom of the bottom cover plate of the housing is provided with a first annular groove matching the annular boss, and the annular boss is placed in the first annular groove.

[0006] Furthermore, the depth of the first annular groove is greater than the height of the annular boss, and the inner diameter thereof is consistent with the outer diameter of the sealing ring.

[0007] Furthermore, the outer diameter of the annular boss is smaller than the outer diameter of the pressure ring, and the inner diameter of the annular boss is the same as the aperture of the second through hole.

[0008] Furthermore, a radial spacing between an outer diameter of the annular boss and an inner diameter of the first annular groove is equal to a radial spacing between an inner diameter of the annular boss and an outer diameter of the air nozzle.

[0009] Furthermore, a second annular groove matching the sealing ring is provided on the air nozzle, and the sealing ring is arranged in the second annular groove.

[0010] Furthermore, the fastener is a bolt, the pressure ring is provided with a third through hole, the bottom of the bottom cover plate of the shell is provided with a threaded blind hole matching the bolt at a position corresponding to the third through hole, and the bolt fixes the pressure ring to the bottom cover plate of the shell through the third through hole and the threaded blind hole.

[0011] Furthermore, the number of the bolts is at least four.

[0012] Furthermore, the gas switch is made of high-strength insulating material.

[0013] Furthermore, the first through hole is a threaded hole.

[0014] Compared with the prior art, the high-power gas switch sealing connection structure of the above structure has the following advantages:

[0015] 1) By adding sealing rings, pressure rings and fasteners, a two-way seal combining axial and radial directions of the gas nozzle is achieved, that is, the internal air pressure of the gas switch is sealed and the outer shell air pressure is sealed, and the sealing effect is good;

[0016] 2) It can prevent the shell from being inflated, so as to avoid the deformation of the bottom cover of the shell causing tensile force on the gas switch, causing gas leakage in the gas switch.

[0017] 3) The gas pipe connecting the gas switch to the outside in the prior art is eliminated, which avoids the problem of sulfide corroding the gas pipe after high-voltage electric shock of sulfur hexafluoride when the gas switch is repeatedly working for a long time or stored for a long time, making the gas pipe brittle and causing gas leakage from the switch.

[0018] 4) The sealing structure is simple, easy to assemble and disassemble, and has good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1It is a cross-sectional schematic diagram of a sealing connection structure of a high-power gas switch in the prior art;

[0021] Figure 2 The present invention is a cross-sectional schematic diagram of a sealing connection structure of a high-power gas switch.

[0022] The corresponding relationship of the reference numerals is:

[0023] 1- Shell bottom cover;

[0024] 2-Gas switch;

[0025] 3-Gas nozzle;

[0026] 4-pressure ring;

[0027] 5-bolt;

[0028] 6- housing;

[0029] 7- Shell top cover plate;

[0030] 8- Gelatinous trachea. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "upper", "lower", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0033] See also Figure 2A high-power gas switch sealing connection structure comprises a shell 6, a shell bottom cover plate 1, a shell top cover plate 7, a gas switch 2 and a gas nozzle 3, the shell bottom cover plate 1 is fixed to the bottom of the shell 6, the shell top cover plate 7 is fixed to the top of the shell 6, the shell 6, the shell bottom cover plate 1 and the shell top cover plate 7 together constitute a sealing body, the gas switch 2 is placed in the sealing body, a first through hole is opened at the bottom of the gas switch 2, the first through hole is preferably a threaded hole, a second through hole is opened on the shell bottom cover plate 1 at a position concentric with the first through hole, the gas nozzle 3 passes through the second through hole and the first through hole in sequence and is fixedly connected to the gas switch 2 (that is, the threaded hole is tightened and connected with the designed gas nozzle 3), a sealing ring is provided on the contact surface between the gas switch 2 and the gas nozzle 3, a pressure ring 4 is sleeved on the gas nozzle 3, and is fixed to the bottom of the shell bottom cover plate 1 by a fastener, the pressure ring 4 and the shell bottom cover plate 1 are fixed by the fastener, so that the sealing ring generates a pre-tightening force, and the sealing ring is squeezed, so that the gas nozzle 3 achieves a sealing effect in both axial and radial directions, that is, a combined axial and radial sealing is achieved. Preferably, the sealing ring is an O-ring. Through the above arrangement, when the device is running, the exposed outside of the gas switch 2 (i.e., the inside of the housing 6) needs to be filled with insulating gas. When the gas pressure increases, the bottom cover plate 1 of the housing will be deformed, while the gas switch 2 is fixed. The gas nozzle 3 connected to the gas switch 2 will generate a tensile force, and the gas nozzle 3 only has a radial friction force of an O-ring, which is smaller than the tensile force. The gas nozzle 3 will move with the gas switch 2, so that the gas switch 2 has a certain degree of mobility relative to the bottom cover plate 1 of the housing without affecting the sealing performance, preventing the bottom cover plate 1 of the housing from deforming and pulling the gas switch 2, thereby realizing the active sealing connection function of the switch body.

[0034] In a further technical solution, in order to enable the sealing ring to better generate preload, an annular boss coaxial with the pressure ring 4 is provided, 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, the radial spacing between the outer diameter of the annular boss and the inner diameter of the first annular groove and the radial spacing between the inner diameter of the annular boss and the outer diameter of the air nozzle 3 are equal, and a first annular groove matching the annular boss is provided at the bottom of the bottom cover plate 1 of the outer shell, and the annular boss is placed in the first annular groove, 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. It should be noted that the specific depth of the first annular groove in the present invention is determined according to the height of the annular boss and the compression ratio of the O-ring. Preferably, Figure 2 In the embodiment shown, the outer diameter of the second through hole is 0.5 mm larger than the outer diameter of the air nozzle 3 , the inner diameter of the annular boss is 0.5 mm larger than the outer diameter of the air nozzle 3 , and the outer diameter of the annular boss is 0.5 mm smaller than the inner diameter of the first annular groove.

[0035] like Figure 2As shown, the aforementioned fastener is preferably a bolt 5, a third through hole is provided on the pressure ring 4, and a threaded blind hole matching the bolt 5 is provided at the bottom of the housing bottom cover plate 1 at a position corresponding to the third through hole. The bolt 5 fixes the pressure ring 4 to the housing bottom cover plate 1 through the third through hole and the threaded blind hole to prevent the annular boss from escaping from the first annular groove on the housing bottom cover plate 1. Preferably, the third through hole is a threaded hole. It should be noted that the number of bolts 5 is at least four. Figure 2 In the illustrated embodiment, the number of the bolts 5 is preferably four, and the four bolts 5 are distributed on the same circumference of the pressure ring 4 at equal intervals.

[0036] In addition, it is worth mentioning that a second annular groove matching the sealing ring is provided on the air nozzle 3, and the sealing ring is arranged in the second annular groove.

[0037] At the same time, in order to meet the pressure resistance requirements of the gas switch body, the gas switch 2 is preferably made of high-strength insulating materials, such as nylon, and other parts can be selected according to requirements to meet the pressure resistance and strength requirements.

[0038] In summary, the present invention Figure 2 In the preferred embodiment shown, first, a threaded hole is provided at the bottom of the gas switch 2 to facilitate connection with the designed gas nozzle 3, and a second annular groove is provided on the contact surface of the gas nozzle 3 with the gas switch 2 for installing the O-ring; then, a second through hole 0.5 mm larger than the outer diameter of the gas nozzle is provided on the bottom cover plate 1 of the housing at a position concentric with the threaded hole, the second through hole is used for the gas nozzle 3 to pass through, and a first annular groove having the same size as the outer diameter of the O-ring is designed on the outer side surface of the second through hole on the bottom cover plate 1 of the housing, and the first annular groove is coaxially arranged with the second through hole; then, an inner The pressure ring 4 has a diameter that is 0.5mm larger than the air nozzle, and the outer diameter of the annular boss is 0.5mm smaller than the inner diameter of the first annular groove. It should be noted that the specific depth of the aforementioned first annular groove is determined according to the annular height of the pressure ring 4 and the compression ratio of the O-ring. The pressure ring 4 is sleeved on the air nozzle 3, and a third through hole is provided on the pressure ring 4. A threaded blind hole is provided at a corresponding position at the bottom of the bottom cover plate 1 of the outer shell. The pressure ring 4 and the bottom cover plate 1 of the outer shell are tightened by bolts 5, so that the O-ring generates a pre-tightening force. The O-ring is squeezed to achieve a sealing effect in both the axial and radial directions of the air nozzle 3, that is, a combined axial and radial sealing. When the shell 6 is inflated, the shell bottom cover plate 1 and the shell top cover plate 7 will deform outward. The position of the gas switch 2 is connected to other components and is fixed, so the shell bottom cover plate 1 will have a downward pulling force on the gas nozzle 3. There is only an O-ring friction force between the gas nozzle 3 and the shell bottom cover plate 1. This friction force is much smaller than the tensile force. The gas switch 2 connected to the gas nozzle 3 will be vertically misaligned with the shell bottom cover plate 1. The gas nozzle 3 is always subjected to the extrusion pre-tightening force of the O-ring to ensure the sealing performance of the shell 6 and the gas switch 2.

[0039] In summary, the present invention has a first through hole at the bottom of the gas switch 2, a second through hole on the bottom cover plate 1 of the shell concentric with the first through hole, the gas nozzle 3 passes through the second through hole and the first through hole in sequence and is fixedly connected to the gas switch 2, a sealing ring is provided on the contact surface between the gas switch 2 and the gas nozzle 3, the pressure ring 4 is sleeved on the gas nozzle 3 and fixed to the bottom of the bottom cover plate 1 of the shell by fasteners, so that long-term use and storage can be achieved, and it has the advantages of simple structure, good sealing and cost saving.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-power gas switch sealing connection structure, comprising a housing (6), a housing bottom cover plate (1), a housing top cover plate (7) and a gas switch (2), wherein the housing bottom cover plate (1) is fixed to the bottom of the housing (6), the housing top cover plate (7) is fixed to the top of the housing (6), the housing (6), the housing bottom cover plate (1) and the housing top cover plate (7) together form a sealing body, and the gas switch (2) is placed in the sealing body, characterized in that: The bottom of the gas switch (2) is provided with a first through hole, and the bottom cover plate (1) of the housing is provided with a second through hole at a position concentric with the first through hole. The gas nozzle (3) passes through the second through hole and the first through hole in sequence and is fixedly connected to the gas switch (2). The contact surface between the gas switch (2) and the gas nozzle (3) is provided with a sealing ring. The pressure ring (4) is sleeved on the gas nozzle (3) and is fixed to the bottom of the bottom cover plate (1) of the housing by means of a fastener. The pressure ring (4) is provided with an annular boss coaxial with the pressure ring. The bottom of the bottom cover plate (1) of the housing is provided with a first annular groove matching the annular boss. The first annular groove is placed in the first annular groove, the depth of the first annular groove is greater than the height of the annular boss, and the inner diameter thereof is consistent with the outer diameter of the sealing ring. The air nozzle (3) is provided with a second annular groove matching the sealing ring, and the sealing ring is arranged in the second annular groove. The fastener is a bolt (5), and the pressure ring (4) is provided with a third through hole. The bottom of the bottom cover plate (1) of the housing is provided with a threaded blind hole matching the bolt (5) at a position corresponding to the third through hole. The bolt (5) is fixedly connected to the pressure ring (4) and the bottom cover plate (1) of the housing through the third through hole and the threaded blind hole.

2. The high-power gas switch sealing connection structure according to claim 1, characterized in that: 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.

3. The high-power gas switch sealing connection structure according to claim 2, characterized in that: The radial spacing between the outer diameter of the annular boss and the inner diameter of the first annular groove is equal to the radial spacing between the inner diameter of the annular boss and the outer diameter of the air nozzle (3).

4. The high-power gas switch sealing connection structure according to claim 3, characterized in that: The number of the bolts (5) is at least four.

5. 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.

6. The high-power gas switch sealing connection structure according to claim 1, characterized in that: The first through hole is a threaded hole.

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