JP2008034128A - Manufacturing method of vacuum bulb - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make coincide the axial center position of the fixed side and the movable side of a vacuum bulb by a small fixing jig. <P>SOLUTION: In the manufacturing method of a vacuum bulb provided with a fixed side member having a fixed side sealing fitting 2, a fixed side current flowing axle 4, and a fixed side contact 5, a vacuum insulation member having a vacuum insulation container 1 of which one end face is brazed to the outer periphery end face of the fixed side sealing fitting 2, a movable side member having a movable side sealing fitting 3 of which the outer periphery end face is brazed to the other end face of the vacuum insulation container 1, a movable side current flowing axle 7, a movable side contact 6, and a bellows 9, the fixed side sealing fitting 2 is inserted into an axial center fixing part 11a of a fixed side fixing jig 11, and the movable side sealing fitting 3 is inserted into the axial center fixing part 12a of a movable side fixing jig 12, and the axial center positions of the fixed side fixing jig 11 and the movable side fixing jig 12 are made coincided to carry out brazing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in a manufacturing method of a vacuum valve having a pair of contacts that can be contacted and separated in a vacuum insulating container.

  Conventionally, in a vacuum valve manufacturing method, a fixed side member having one contact, a movable side member having the other contact, and a vacuum insulating container member that houses the member having these contacts are brazed in a vacuum furnace. Attached.

  In such a manufacturing method, a technique for polishing both end faces of a cylindrical vacuum insulating container made of alumina porcelain is known in order to match the axial center positions of the fixed side member and the movable side member (for example, Patent Document 1).

On the other hand, a technique for centering the fixed side member and the movable side member with a positioning jig is known. The positioning jig is used for centering from three directions on the circumference of each member, and rotates and slides on the outer periphery of the member so that the axial center positions coincide with each other (for example, Patent Documents). 2).
Japanese Utility Model Publication No. 56-123431 (Page 7, Fig. 2) Japanese Patent No. 2653463 (pages 3-4, Fig. 1)

  The above-described conventional vacuum valve manufacturing method has the following problems.

  In the polishing of the vacuum insulating container, since the alumina porcelain is a very hard material, it cannot be cut like a general metal material and is polished using a grindstone. In general, the finished size of the vacuum insulation container is about ± 2 mm, which is polished to, for example, ± 0.2 mm. For this reason, the polishing process takes a lot of time, the work is difficult, and the price is disadvantageous.

  On the other hand, when the positioning jig is used, although the polishing of the vacuum insulating container is not necessary, the positioning jig is rotated and slid, so that the outer shape is enlarged. For this reason, many could not be arranged in a vacuum furnace in a limited space. Therefore, the operation efficiency of the vacuum furnace is reduced, man-hours for rotating and sliding the positioning jig are required, and the positioning jig itself has a complicated configuration and cannot cope with vacuum valves of various shapes.

  The present invention has been made to solve the above-described problems, and a vacuum valve manufacturing method that can position a shaft center position with a small jig that does not require polishing of a vacuum insulating container and can reduce the occupation area of a vacuum furnace. The purpose is to provide.

  In order to achieve the above-described object, the vacuum valve manufacturing method of the present invention includes a fixed-side sealing metal fitting, a fixed-side energizing shaft, a fixed-side member having a fixed-side contact, and an outer peripheral end face of the fixed-side sealing metal fitting. A vacuum insulating member having a vacuum insulating container whose end surface is brazed, and the movable side sealing metal fitting, the movable side energizing shaft, the movable side energizing shaft, the outer peripheral end surface of which is brazed to the other end surface of the vacuum insulating container In a manufacturing method of a vacuum valve including a side contact and a movable side member having a bellows, the fixed side fitting is fitted into a shaft center fixing portion of a fixed side fixing jig, and the movable side fitting is also fixed on the movable side. The brazing is performed by fitting into the axial center fixing portion of the jig, matching the axial center positions of the fixed side fixing jig and the movable side fixing jig.

  According to the present invention, the fixed side member is fitted into the shaft center fixing portion of the fixed side fixing jig, and the movable side member is also fitted into the axis center fixing portion of the movable side fixing jig to perform brazing. The axial center positions of the side member and the movable side member can be accurately matched.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a method for manufacturing a vacuum valve according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a cross-sectional view illustrating a method for manufacturing a vacuum valve according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view illustrating a method for manufacturing a fixed side in FIG. 1, and FIG. 3 is a movable side in FIG. FIG. 4 is a cross-sectional view illustrating the misalignment state of the vacuum insulating container according to Embodiment 1 of the present invention.

  First, the configuration of the vacuum valve will be described. As shown in FIG. 1, the outer peripheral end surfaces of the flange-like fixed-side sealing fitting 2 and the movable-side sealing fitting 3 are respectively sealed on the opening surfaces at both ends of a cylindrical vacuum insulating container 1 made of alumina porcelain. ing. The fixed-side sealing metal fitting 2 has a fixed-side energizing shaft 4 penetrating and fixed in the concave portion 2a at the center, and a fixed-side contact 5 is fixed to the end thereof. Opposite to the fixed contact 5, a movable contact 6 that is detachable is fixed to the end of the movable energizing shaft 7 that movably penetrates the recess 3 a of the central opening of the movable seal 3. . An expandable / contractible bellows 9 is sealed between the bellows cover 8 fixed to the middle portion of the movable side energizing shaft 7 and the movable side sealing fitting 3.

  As a result, the fixed contact 5 and the movable contact 6 can be brought into and out of contact with each other while the vacuum insulating container 1 is kept in a vacuum. A cylindrical arc shield 10 is fixed to an intermediate portion in the vacuum insulating container 1 so as to surround the contacts 5 and 6.

  Here, a fixed-side member is constituted by the fixed-side sealing fitting 2, the fixed-side energizing shaft 4, and the fixed-side contact 5, and the movable-side sealing fitting 3, the movable-side contact 6, the movable-side energizing shaft 7, and the bellows cover. 8 and the bellows 9 constitute a movable member, and the vacuum insulation container 1 and the arc shield 10 constitute a vacuum insulation container member.

  Next, brazing of the vacuum valve will be described. As shown in FIG. 1, each member has a cylindrical first fixed-side fixing jig 11 that covers the vacuum insulating container 1 and an outer periphery into which one end of the first fixed-side fixing jig 11 is fitted. The center position of the shaft is positioned by the disc-shaped first movable side fixing jig 12 protruding in a ring shape, and brazed in a vacuum furnace. In this case, each of the fixed side member, the movable side member, and the vacuum insulating container member is brazed in advance so that the axial center positions coincide with each other. This brazing material is a brazing material having a temperature higher than that of the brazing material that brazes between the members to be finally assembled.

  The other end of the first fixed-side fixing jig 11 is provided with a fixed-side fixing portion 11a having an axial center portion protruding inward, and a fixed-side hole 11b through which the fixed-side energizing shaft 4 passes. Is provided. Similarly, the first movable-side fixing jig 12 is provided with a movable-side fixed portion 12a having an axial center portion protruding inward, and a movable-side hole 12b through which the movable-side conductive shaft 7 passes is provided at the central portion. Yes.

  Next, a method for manufacturing such a vacuum valve will be described with reference to FIGS.

  As shown in FIG. 2, the fixed-side member is inserted into the first fixed-side fixing jig 11, and the concave portion 2a of the fixed-side sealing metal fitting 2 is formed while the fixed-side conductive shaft 4 is passed through the fixed-side hole 11b. It fits in the fixed side fixing | fixed part 11a. Here, the inner diameter A2 of the recess 2a of the fixed-side sealing fitting 2 is slightly larger than the outer diameter A1 of the fixed-side fixing portion 11a. For example, since the fixed-side sealing fitting 2 is manufactured by machining or precision press processing and the dimensional accuracy is maintained, the difference between A1 and A2 is set to about 0.2 mm within the tolerance.

  For this reason, the axial center position of the fixed-side member can be positioned by fitting the concave portion 2a of the fixed-side sealing fitting 2 into the fixed-side fixed portion 11a. The inner diameter B of the first fixed-side fixing jig 11 is larger than the outer diameter D2 of the vacuum insulating container 1.

  Here, the fixed-side fixing portion 11a is positioned at the center of the axis of the first fixed-side fixing jig 11, and the fixed-side member is positioned at the center of the shaft by fitting the concave portion 2a of the fixed-side sealing metal fitting 2. Can be made. For this reason, the fixed-side fixing portion 11a is defined as a fixed-side axial center fixing portion.

  Then, the vacuum insulating container member is inserted into the first fixed-side fixing jig 11, and one end surface of the vacuum insulating container 1 is brought into contact with the outer peripheral end surface of the fixed-side sealing fitting 2. The vacuum insulating container 1 is not polished, and brazing material is attached to the opening surfaces at both ends. A brazing material is also attached between one end of the bellows 9 and the movable side sealing fitting 3.

  Next, as shown in FIG. 3, the movable side member is inserted, and the outer peripheral end surface of the movable side sealing fitting 3 is brought into contact with the other end surface of the vacuum insulating container 1. Then, the movable side fixing portion 12 a is fitted into the concave portion 3 a of the movable side sealing fitting 3 while the movable side energizing shaft 7 is passed through the movable side hole 12 b of the first movable side fixing jig 12. At the same time, the first movable side fixing jig 12 is fitted into the first fixed side fixing jig 11.

  Here, the inner diameter C2 of the concave portion 3a of the movable side fitting 3 is slightly larger than the outer diameter C1 of the movable side fixing portion 12a. Since the movable side sealing metal fitting 3 maintains the dimensional accuracy similarly to the fixed side sealing metal fitting 2, the difference between C1 and C2 is set to about 0.2 mm, for example. Furthermore, the inner diameter B of the first fixed side fixing jig 11 is slightly larger than the outer diameter E of the first movable side fixing jig 12. That is, the first movable side fixing jig 12 is fitted into the first fixed side fixing jig 11, and the difference between the outer diameter E and the inner diameter B is, for example, about 0.2 mm.

  For this reason, the axial center position of the movable side member can be positioned by fitting the concave portion 3a of the movable side sealing fitting 3 into the movable side fixing portion 12a. Further, by inserting the first movable side fixing jig 12 into the first fixed side fixing jig 11, the axial center positions of the fixed side member and the movable side member can be positioned.

  Here, the movable side fixing portion 12a is positioned at the center of the axis of the first movable side fixing jig 12, and the movable side member is positioned at the center of the shaft by fitting the concave portion 3a of the movable side sealing metal fitting 3. Can be made. For this reason, the movable-side fixed portion 12a is defined as a movable-side axial center fixed portion.

  The inner diameter D1 of the first movable side fixing jig 12 is larger than the outer diameter D2 of the vacuum insulating container 1. Since the outer diameter D2 of the vacuum insulating container 1 has a fired finish dimension of, for example, about ± 2 mm, the inner diameter D1 of the first movable side fixing jig 12 is set to a size that allows this dimension.

  Next, the fixed side member, the movable side member, and the vacuum insulating container member into which the first movable side fixing jig 12 is fitted in the first fixed side fixing jig 11 are carried into a vacuum furnace (not shown). If the brazing material provided on the both end opening surfaces of the vacuum insulating container 1 and the bellows 9 is melted by heating and vacuuming, the fixed-side sealing metal fitting 2 and the movable side sealing metal fittings are formed on both end opening surfaces of the vacuum insulating container 1. 3 and between the bellows 9 and the movable side sealing fitting 3 can be sealed.

  As shown in FIG. 4, the vacuum valve manufactured in this way can accurately match the axial center positions of the fixed member and the movable member. However, the vacuum insulation container member having the vacuum insulation container 1 may be eccentric by the difference between the inner diameter D1 of the first movable side fixing jig 12 and the outer diameter D2 of the vacuum insulation container 1. In FIG. 4, the vacuum insulation container member is biased in the direction of the arrow shown. The maximum eccentricity depends on the finished size of the vacuum insulating container 1 and is several mm.

  That is, the axial center positions of the fixed side member and the movable side member are made to coincide with each other with high precision, and the eccentricity of the vacuum insulating container member is allowed. If the fixed member and the movable member are eccentric, the operating force of the operating mechanism connected to the movable energizing shaft 7 may apply stress to each part and damage the vacuum valve. There is sex. In order to prevent this, the axial center positions of the fixed side member and the movable side member are matched. In general, the center positions of the axes may be within 1 mm, and can be within this value in the manufacturing method described above.

  There is a possibility that the vacuum insulating container member is eccentric. However, the eccentricity of about several millimeters has little influence on the internal insulation characteristics, and there is no problem in use. If a hole for internal confirmation is provided in the cylindrical portion of the first fixed-side fixing jig 11, the position of the vacuum insulating container member can be confirmed, and the degree of eccentricity can be suppressed. Furthermore, the fixing jigs 11 and 12 become small, and a large number can be arranged in the vacuum furnace, so that workability can be improved.

  According to the manufacturing method of the vacuum valve of the first embodiment, the fixed-side sealing metal fitting 2 of the fixed-side member is fitted into the fixed-side fixing portion 11a of the first fixed-side fixing jig 11, and the brazing material is formed on both end opening surfaces. Is attached to the outer peripheral end surface of the fixed-side sealing fitting 2, and then the outer peripheral end surface of the movable-side sealing fitting 3 of the movable-side member is brought into contact with the other end surface. While the movable side fixing portion 12a of the movable side fixing jig 12 is fitted into the movable side sealing fitting 3, the first movable side fixing jig 12 is fitted into the first fixed side fixing jig 11 to perform brazing. Therefore, the axial center positions of the fixed-side member and the movable-side member can be accurately matched by the small fixing jigs 11 and 12.

  In the first embodiment, the fixing side fixing portion 11a of the first fixing side fixing jig 11 is fitted in the concave portion 2a of the fixing side sealing metal fitting 2, and the positioning of the axial center position of the fixing side member has been described. An annular projecting portion that fits the outer periphery of the side sealing fitting 2 may be provided on the first fixed-side fixing jig 11 to position the axial center position of the fixed-side member. Similarly, the movable side member is also provided with an annular protrusion on the first movable side fixing jig 12 so as to fit the outer peripheral portion of the movable side fitting 3, and the axial center position of the movable side member is positioned. You may go.

  The annular protrusions of the first fixed side fixing jig 11 and the first movable side fixing jig 12 are located at the center of the axis, and the outer peripheral part of the fixed side sealing metal fitting 2 and the movable side sealing metal fitting 3 By fitting the outer peripheral portion, the fixed side member and the movable side member can be positioned at the center of the shaft, so that these are defined as the fixed side and the movable side shaft center fixed portions as in the above definition. .

  Next, the manufacturing method of the vacuum valve concerning Example 2 of the present invention is explained with reference to FIG. FIG. 5 is a cross-sectional view illustrating a method for manufacturing a vacuum valve according to Embodiment 2 of the present invention. The second embodiment differs from the first embodiment in the shape of the fixing jig. In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, the outer diameter of the cylindrical part of the cylindrical second fixed side fixing jig 21 having the fixed side fixing part 21a is the second movable side fixing jig 22 having the movable side fixing part 22a. It is slightly smaller than the inner diameter of. The difference between the inner diameter and the outer diameter is about 0.2 mm.

  Accordingly, the movable side member is fitted into the movable side fixing portion 22a, the vacuum insulating container member and the stationary side member are sequentially brought into contact with each other, and the stationary side fixing portion 21a is fitted into the stationary side member while the second stationary side fixing jig is fitted. If 21 is fitted in the second movable side fixed member 22, the axial center positions of the movable side member and the fixed side member can be made to coincide with each other with high accuracy.

  According to the vacuum valve manufacturing method of the second embodiment, the same effect as that of the first embodiment can be obtained.

  Next, the manufacturing method of the vacuum valve concerning Example 3 of the present invention is explained with reference to FIG. FIG. 6 is a cross-sectional view illustrating a method for manufacturing a vacuum valve according to Embodiment 3 of the present invention. The third embodiment is different from the second embodiment in the shape of the fixing jig. In FIG. 6, the same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, the third fixed-side fixing jig 31 has a disk shape with an outer periphery having a fixed-side fixing portion 31 a protruding in an annular shape, and the third movable-side fixing jig 32 is fixed on the movable side. It has a cylindrical shape having a portion 32a. The inner diameter of the third fixed side fixing jig 31 is slightly smaller than the outer diameter of the cylindrical portion of the third movable side fixing jig 32. The difference between the inner diameter and the outer diameter is about 0.2 mm.

  According to the vacuum valve manufacturing method of the third embodiment, the same effect as that of the second embodiment can be obtained.

  Next, the manufacturing method of the vacuum valve concerning Example 4 of the present invention is explained with reference to FIG. FIG. 7 is a cross-sectional view illustrating a method for manufacturing a vacuum valve according to Embodiment 4 of the present invention. The fourth embodiment is different from the third embodiment in the shape of the fixing jig. In FIG. 7, the same components as those of the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, the fourth fixed side fixing jig 41 has a disk shape with the outer periphery having the fixed side fixing portion 41a projecting in an annular shape, and the fourth movable side fixing jig 42 is also movable in the same manner. The outer periphery which has the side fixing | fixed part 42a is made into the disk shape which protruded cyclically | annularly. These are fitted in a cylindrical intermediate fixing jig 43. The outer diameter of the fourth fixed-side fixing jig 41 and the outer diameter of the fourth movable-side fixing jig 42 are the same size, and are slightly smaller than the inner diameter of the intermediate fixing jig 43. The difference between the inner diameter and the outer diameter is about 0.2 mm.

  According to the vacuum valve manufacturing method of the fourth embodiment, the same effect as that of the third embodiment can be obtained.

  Next, a method for manufacturing a vacuum valve according to Embodiment 5 of the present invention will be described with reference to FIGS. FIG. 8 is a cross-sectional view illustrating a method for manufacturing a vacuum valve according to Embodiment 5 of the present invention, and FIG. 9 is a top view of FIG. The fifth embodiment is different from the fourth embodiment in the shape of the fixing jig. 8 and 9, the same components as those in the fourth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 8 and 9, the fifth fixed-side fixing jig 51 is formed in a disc shape having a fixed-side fixing part 51a, and the fifth movable-side fixing jig 52 is also a circle having a movable-side fixing part 52a. It is plate-shaped. Four positioning rods 53 are fixed to the outer periphery of the fifth fixed-side fixing jig 51. The fifth movable side fixing jig 52 facing the positioning bar 53 is provided with a positioning hole 54 having an inner diameter slightly larger than the outer diameter of the positioning bar 53.

  In addition, it is sufficient that the position bar 53 and the position hole 54 are provided in a plurality of three or more points. Further, the positioning bar 53 may be fixed to the fifth movable side fixing jig 52 and the positioning hole 54 may be provided in the fifth fixed side fixing jig 51.

  According to the vacuum valve manufacturing method of the fifth embodiment, the same effect as that of the fourth embodiment can be obtained.

Sectional drawing explaining the manufacturing method of the vacuum valve which concerns on Example 1 of this invention. Sectional drawing explaining the manufacturing method of the stationary side of FIG. Sectional drawing explaining the manufacturing method of the movable side of FIG. Sectional drawing explaining the misalignment state of the vacuum insulation container which concerns on Example 1 of this invention. Sectional drawing explaining the manufacturing method of the vacuum valve which concerns on Example 2 of this invention. Sectional drawing explaining the manufacturing method of the vacuum valve which concerns on Example 3 of this invention. Sectional drawing explaining the manufacturing method of the vacuum valve which concerns on Example 4 of this invention. Sectional drawing explaining the manufacturing method of the vacuum valve which concerns on Example 5 of this invention. FIG. 9 is a top view of FIG. 8.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum insulation container 2 Fixed side sealing metal fittings 2a, 3a Recessed part 3 Movable side sealing metal fitting 4 Fixed side energizing shaft 5 Fixed side contact 6 Movable side contact 7 Movable side energizing shaft 8 Bellows cover 9 Bellows 10 Arc shield 11 1st Fixed side fixing jigs 11a, 21a, 31a, 41a, 51a Fixed side fixing parts 11b, 21b, 31b, 41b, 51b Fixed side holes 12 First movable side fixing jigs 12a, 22a, 32a, 42a, 52a Movable side Fixed portion 12b, 22b, 32b, 42b, 52b Movable side hole 21 Second fixed side fixing jig 22 Second movable side fixing jig 31 Third fixed side fixing jig 32 Third movable side fixing jig 41 Fourth fixed side fixing jig 42 Fourth movable side fixing jig 43 Intermediate fixing jig 51 Fifth fixed side fixing jig 52 Fifth movable side fixing jig 53 Positioning rod 54 Positioning hole

Claims (5)

A fixed-side sealing bracket, a fixed-side energizing shaft, a fixed-side member having a fixed-side contact;
A vacuum insulating member having a vacuum insulating container whose one end surface is brazed to the outer peripheral end surface of the fixed-side sealing fitting;
A vacuum valve comprising: the movable side fitting, the movable side energizing shaft, the movable side contact, and the movable side member having a bellows, wherein the outer peripheral end surface of the movable side fitting is brazed to the other end surface of the vacuum insulating container. In the manufacturing method,
The fixed-side sealing fitting is fitted into the shaft center fixing portion of the fixed-side fixing jig,
The movable side sealing fitting is also fitted into the shaft center fixing part of the movable side fixing jig,
A method of manufacturing a vacuum valve, wherein the brazing is performed by aligning axial center positions of the fixed side fixing jig and the movable side fixing jig. The fixed-side sealing metal fitting and the movable-side sealing metal fitting are each provided with a recess at the center,
The fixed-side fixing jig and the movable-side fixing jig are each provided with a fixing portion protruding at the center of the shaft,
The method for manufacturing a vacuum valve according to claim 1, wherein the fixing portion is fitted into the recess. One fixing jig of the fixed side fixing jig and the movable side fixing jig is cylindrical so that the vacuum insulating container member can be inserted,
The other fixing jig is disc-shaped,
The method for manufacturing a vacuum valve according to claim 1, wherein the fixing jigs are fitted together. The fixed-side fixing jig has a disk shape,
The movable side fixing jig is also in a disk shape,
The vacuum valve manufacturing method according to claim 1 or 2, wherein the fixed side fixing jig and the movable side fixing jig are fitted into a cylindrical intermediate fixing jig. Each of the fixed side fixing jig and the movable side fixing jig has a disk shape,
3. A plurality of positioning bars are fixed to the outer periphery of one fixing jig, and a plurality of positioning holes into which the positioning bars are fitted are provided in the other fixing jig. The manufacturing method of the vacuum valve of description.

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