CN218482440U - Insulating connector for high-voltage vacuum device - Google Patents

Abstract

The utility model discloses a high pressure vacuum is insulating connector for device. In order to overcome the problem that prior art high-voltage electronic components connect reliability not enough in the use of vacuum environment, the utility model discloses a conducting rod, ceramic insulator and middle transition ring, the pole body of conducting rod inserts in the through-hole at ceramic insulator center, the one end of pole body is connected with the contact, one side that is close to the pole body at the contact of conducting rod is equipped with the ring channel along the circumferencial direction, annular groove is cut apart into annular thin end and tip with the contact of conducting rod, annular thin end opposite side is connected with middle transition ring one side, middle transition ring opposite side is connected with ceramic insulator, the reliability that vacuum components and parts are connected with insulating connector has been guaranteed to the structural design of conducting rod, sealed and external design has increased gas tightness and insulating nature through the contact surface simultaneously.

Description

Insulating connector for high-voltage vacuum device

Technical Field

The utility model relates to a high pressure vacuum device especially relates to an insulated connector for high pressure vacuum device with insulating adapting unit's technical field.

Background

As early as the last century, vacuum has been considered the best medium for the operation and use of high voltage electronic components. However, the vacuum sealing technology falls behind at that time, so that the vacuum degree meeting the use requirement cannot be realized. Meanwhile, the thermal properties of the materials are not accurately mastered, and the smelting technology and the processing level are not in a pass, so that the vacuum medium cannot be effectively applied to the electrical industry.

Because the high-voltage vacuum electrical appliance system has high maintenance difficulty and high equipment cost, the components need to bear high-voltage impact in the use process, the high-voltage vacuum electrical appliance system has higher requirements on connection reliability for reducing the fault probability of the component connector in the use period and ensuring the through-flow smoothness of the conductor, and the connector also needs to be ensured to have high-grade air tightness and insulativity while ensuring reliable connection.

For example, chinese patent document CN 106128853A discloses a conducting rod for a vacuum interrupter, which is provided with a core of a movable conducting rod and a stationary conducting rod, which are less dense than the material of the conducting rod, at the center of the inner part of the movable conducting rod and the stationary conducting rod, so as to improve the mechanical strength of the conducting rod, and prevent the conducting rod from being subjected to mechanical impact and deforming roughly under the extrusion stress. The defects are that the processing is difficult, the circuit connection with the circular end face is adopted, the resistance is large, and the connection reliability is not high.

Disclosure of Invention

The utility model discloses mainly solve prior art high-voltage electronic components and parts and connect the not enough problem of reliability in the use in vacuum environment, provide a high-pressure vacuum is insulating connector for device.

The above technical problem of the utility model is mainly solved through the following technical scheme:

the utility model discloses a conducting rod, ceramic insulator and middle transition ring, during the pole body of conducting rod inserted the through-hole at ceramic insulator center, the one end of pole body was connected with the contact, was equipped with the ring channel along the circumferencial direction in one side that the contact of conducting rod is close to the pole body, and annular groove is cut apart the contact of conducting rod for annular thin end and tip, and annular thin end opposite side is connected on one side of with middle transition ring, and middle transition ring opposite side is connected with ceramic insulator. This structural design gives the effectual support of conducting rod when axial or radial atress, prevents that its atress in-process from leading to warping and damaging because matter is soft, and the stress that the thermal energy inequality arouses between each material is too big effectively in the setting of ring channel, causes insulating porcelain spare fracture problem.

Preferably, the joint end is a circular truncated cone, the diameter of the joint end is larger than that of the rod body, the side face of the joint end is provided with a silver coating, and the contact surface when the joint end is butted with other conducting media is a circular truncated cone end face and the peripheral side face.

Preferably, the groove width of the annular groove is larger than the sum of the thermal expansion deformation quantities of the two sides of the position of the conducting rod, and meanwhile, the groove width is not suitable to be too large, so that when the conducting rod joint circular table top is in butt contact with other conducting media, deflection deformation occurs under the action of friction force.

Preferably, the depth of the annular groove is flush with the cylindrical surface of the conductive rod body, so that the problem of cracking caused by nonuniform height difference of the left side and the right side of the annular thin end head and nonuniform thermal expansion deformation in space can be effectively solved.

Preferably, the outer surface of the ceramic insulator is provided with a corrugated surface, the corrugated surface consists of a plurality of convex arc surfaces and concave arc surfaces which are connected end to end, the structural design artificially increases the creepage distance between conductors, avoids the danger of insulation failure and easy-to-touch surface electrification caused by high voltage, and has good insulation property and high safety.

Preferably, the middle section of the corrugated surface is provided with an annular bulge, the annular bulge is arranged on one side of a vacuum atmosphere, and the annular bulge is in sealing butt joint with the vacuum protection cover body through a fluorine-silicon rubber O-shaped ring with good sealing performance, so that the fluorine-silicon rubber has excellent heat resistance and high voltage resistance, and the air tightness of a joint surface of a sealed piece is guaranteed.

Preferably, the thickness of the annular thin end is 1-1.7 mm, the deformation caused by the thermal expansion of the conducting rod made of the oxygen-free copper material in the range is just absorbed by the thickness of the intermediate transition ring, and the weld opening cracking cannot be caused.

Preferably, the conical angle of the side face of the circular table top of the joint end is larger than 15 degrees, a transition fillet is arranged at the connecting edge of the circular table top of the joint end and the annular groove, the conical degree has an automatic centering effect, and the stability and the reliability of connection are ensured.

Preferably, the ceramic insulator is connected with the annular thin end head in a sealing and brazing mode with the intermediate transition ring, and the structure isolates the vacuum state inside the cavity from the external atmospheric state, so that effective air sealing is realized.

Preferably, the outer edge of the middle transition ring protrudes along the axial direction, so that the contact area between the middle transition ring and the ceramic insulator is increased, and the connection reliability is enhanced.

The utility model has the advantages that:

1. through conducting rod body and ceramic insulator center through-hole clearance fit, the pole body terminal surface is connected with indirect brazing through middle transition ring with ceramic insulator, and the joint end has guaranteed the reliability that vacuum components and parts are connected with insulating connector for the structural design of round platform: the problem of uneven thermal expansion is solved, and meanwhile, the butt joint contact area is increased, and the contact resistance is reduced.

2. The high-grade air tightness of the insulating connector for the vacuum component is ensured through effective brazing sealing of the contact surface.

3. The ceramic insulator artificially increases the creepage distance between conductors through the design of the corrugated surface of the middle section of the outside, and avoids the danger of insulation failure and electrification of the accessible surface caused by high voltage.

Drawings

Fig. 1 is a sectional view of an insulating connector for a high-pressure vacuum device according to the present invention.

Fig. 2 is an exploded view of the insulating connector for a high pressure vacuum device according to the present invention.

Fig. 3 is a schematic view of the overall structure of the insulating connector for a high-pressure vacuum device of the present invention.

In the figure, 1, a ceramic insulator, 2, an annular bulge, 3, an annular groove, 4, a conductive rod, 5, an annular thin end, 6, a joint end, 7, an intermediate transition ring and 8, a rod body are arranged.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

Example (b):

an insulating connector for a high-voltage vacuum device of the present embodiment, as shown in fig. 1 to 3, includes a conductive rod 4, a ceramic insulator 1, and an intermediate transition ring 7. The rod body 8 of the conducting rod 4 is inserted into the through hole in the center of the ceramic insulator 1, so that the conducting rod 4 can be effectively supported, and deformation and damage caused by softness in the stress process of the conducting rod are prevented. The contact is connected to the right side one end of pole body 8, is equipped with the annular groove 3 of specific size along the circumferencial direction in the contact is close to the one side of pole body 8, can avoid the stress that the thermal expansion inequality arouses between each material too big, causes the insulating porcelain piece fracture problem. The groove width of the annular groove 3 is larger than the sum of the thermal expansion deformation of two sides of the position of the conductive rod 4, and meanwhile, the groove width is not too large, so that when the contact circular table surface of the conductive rod joint is in butt joint contact with other conductive media, deflection deformation occurs under the action of friction force; the groove depth is flush with the 8 cylindrical surfaces of the rod body, so that the problem of cracking caused by nonuniform thermal expansion deformation in space due to nonuniform height difference of the left side and the right side of the annular thin end head is effectively solved. The contact of the conducting rod is divided into the annular thin end 5 and the joint end 6 by the annular groove 3, wherein the annular thin end 5 is arranged on the left side of the annular groove 3, the joint end 6 is arranged on the right side of the annular groove, the joint end 6 is a circular truncated cone, and the contact surface when the annular groove is in butt joint with other conducting media is a circular truncated cone end surface and the peripheral side surface. The diameter of the circular truncated cone is larger than that of the rod body 8, and the side face of the circular truncated cone is provided with a silver coating, so that contact resistance can be reduced, and surface conductivity can be improved. The connecting edge of the circular table surface of the joint end 6 and the annular groove 3 is provided with a transition fillet. The other side of the annular thin end 5 is in sealing brazing connection with one side of the middle transition ring 7, so that the vacuum state inside the cavity is isolated from the external atmospheric state, and effective air sealing is realized. The other side of the middle transition ring 7 is connected with the ceramic insulator 1, the outer edge of the middle transition ring 7 protrudes along the axial direction to be metalized, and the kovar alloy material is adopted to realize an effective air sealing function. The outer surface of the ceramic insulator 1 is provided with a corrugated surface, the corrugated surface consists of a plurality of convex arc surfaces and concave arc surfaces which are connected end to end, the creepage distance between conductors is increased by the design person, the danger of insulation failure and easy-to-touch surface electrification caused by high voltage is avoided, and the insulativity and the safety are improved. The middle section of the corrugated surface is provided with an annular bulge 2, the annular bulge 2 is arranged on one side of a vacuum atmosphere, and the fluorine silicon rubber O-shaped ring with good sealing performance is in sealing butt joint with the vacuum protection cover body, so that the fluorine silicon rubber has excellent heat resistance and high voltage resistance, and the air tightness of a joint surface of a sealed piece is guaranteed.

The implementation process is as follows: the conducting rod is a core member of the vacuum connection contact and is made of an oxygen-free copper material with good conductivity, on one hand, no harmful reaction is generated in the vacuum brazing process due to the selection of the oxygen-free copper, the possibility that components are damaged or leaked is avoided, and on the other hand, the low-resistance characteristic of the conducting rod improves the through-current capacity of the connection circuit to the maximum extent. The peripheral material of the conducting rod is 95% alumina ceramic or 99% alumina ceramic with excellent insulating property, the volume resistivity rho v of the 95% alumina ceramic at 100 ℃ is more than or equal to 1 multiplied by 1013 omega cm, and the direct-current breakdown strength can reach 30 to 40kV/mm.

The joint end of the conducting rod is processed into a circular truncated cone with a specified size, the side taper of the circular truncated cone is larger than 15 degrees, and the end face of the joint end is a small circular end face of the circular truncated cone. And then, processing an annular groove with a specific size along the reverse direction of the circular truncated cone structure by taking the edge of the large circle of the circular truncated cone as a starting point or taking a certain point on the cylindrical surface of the joint end as a starting point, wherein the groove width is 1 to 2mm, and meanwhile, the thickness of an annular thin end on the other side of the annular groove is ensured to be 1 to 1.7 mm. And chamfering the connecting edge of the circular truncated cone great circle and the annular groove.

The ceramic insulator material is made of 95% alumina ceramic material with density not lower than 3.63g/cm3 or 99% alumina ceramic material with density not lower than 3.85g/cm3, the air leakage rate QK is not more than 1 x 10-11Pa.M3/S, and molybdenum-manganese metallization treatment is carried out on the outer circular surface of the end part of the ceramic insulator. The middle transition ring is made of kovar alloy 4J33, the middle transition ring is processed into an annular structure with the outer edge protruding in the axial direction, the central aperture of the middle transition ring is completely consistent with that of the ceramic insulator, and the end face and part of the outer circular face of the ceramic insulator can be wrapped by the concave part.

And then, brazing filler metal (wires or sheets are placed to the position required by the process, the middle transition ring is placed on the end face of the ceramic insulator to wrap part of the ceramic insulator, the other side of the ceramic insulator is inserted into the processed conducting rod, the brazing filler metal, the wires or sheets, the middle transition ring and the processed conducting rod are placed into a vacuum furnace to be brazed, airtightness detection is carried out, the brazed high-pressure vacuum insulation connector structure is plugged into the position, corresponding to the vacuum protection cover body provided with the fluorosilicone rubber O-shaped ring, of the vacuum protection cover body in a reasonable mode, and the vacuum component insulation connector is installed.

It should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.

Claims (10)

1. The insulating connector for the high-voltage vacuum device is characterized by comprising a conductive rod, a ceramic insulator and a middle transition ring, wherein a rod body of the conductive rod is inserted into a through hole in the center of the ceramic insulator, one end of the rod body is connected with a contact, an annular groove is formed in one side, close to the rod body, of the contact of the conductive rod in the circumferential direction, the contact of the conductive rod is divided into an annular thin end and a connector end by the annular groove, the other side of the annular thin end is connected with one side of the middle transition ring, and the other side of the middle transition ring is connected with the ceramic insulator.

2. The insulation connector according to claim 1, wherein the connector end is a circular truncated cone, the diameter of the connector end is larger than that of the rod body, and the side surface of the connector end is provided with a silver coating.

3. The insulation connector according to claim 1, wherein the width of the annular groove is larger than the sum of the thermal expansion deformation of the two sides of the position of the conductive rod.

4. The insulation connector according to claim 1, wherein the depth of the annular groove is flush with the cylindrical surface of the conductive rod body.

5. The insulation connector for a high-voltage vacuum device as recited in claim 1, wherein the outer surface of said ceramic insulator is provided with a corrugated surface.

6. The insulation connector according to claim 5, wherein the corrugated surface has a ring-shaped protrusion at a middle portion thereof.

7. The insulating connector for the high-voltage vacuum device as recited in claim 1, wherein the thickness of the annular thin end is 1-1.7 mm.

8. The insulation connector according to claim 2, wherein the conical angle of the side surface of the round table surface of the connector end is larger than 15 degrees, and the connecting edge of the round table surface of the connector end and the annular groove is provided with a transition fillet.

9. The insulating joint according to claim 1, wherein the ceramic insulator is connected with the thin annular end by means of sealing and brazing with the intermediate transition ring.

10. The insulating joint according to claim 1, wherein the outer edge of the intermediate transition ring is convex in the axial direction.

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