KR101114082B1 - Contact structure of a vacuum valve and a method of manufacturing the same - Google Patents

Abstract

The present invention integrates a contact portion, a conducting bar and a screw portion for connecting to an external operation portion or a wiring by a simple method that does not involve pressure, and a contact structure of a vacuum valve which can easily secure the component dimensions of each portion and its manufacture. To provide a way.

A molded body 28 made of a copper-chromium sintered body is placed in an opening of a tubular body 26 having a bottom portion 25 made of austenitic stainless steel having a base material 27 for a conducting bar, which is a block of anoxic copper, On top of that, place a molten copper (29 :) made of anoxic copper blocks. The granulated product 30 is heated to 1200 ° C. in a hydrogen atmosphere to melt the base material 27 and the infiltration material 29 for the energized bar. The infiltration material 29 fills the porous hole portion of the molded body 28, and the surplus is dipped into the tubular body 26 to be integrated with the base material 27 for the energizing bar to integrate the inside of the tubular body 26. It fills, and it solidifies by cooling, and the interface of the contact 32, the cylindrical body 26, and the electricity supply bar base material 27 before finishing is firmly joined. Thereafter, a male screw portion is formed on the lower outer periphery of the cylindrical body 26.

Description

CONTACT STRUCTURE OF A VACUUM VALVE AND A METHOD OF MANUFACTURING THE SAME

The present invention relates to a contactor structure of a vacuum valve for opening and closing an energized current used in a vacuum circuit breaker and a method of manufacturing the same.

4 is a cross-sectional view showing the main part configuration of a conventional vacuum valve. The vacuum valve shown in FIG. 4 is provided with the ceramic insulating cylinder 1 for ensuring insulation. Both ends are provided with metallizings 2a and 2b for enabling soldering. A metal upper end plate 3a and a lower end plate 3b are joined to the metallizing 2a and 2b surfaces, respectively, and an airtight container 4 is formed.

The upper end plate 3a and the lower end plate 3b are respectively penetrated in the hermetic container 4, and the movable side conducting bar 6 and the fixed side contact of the movable contactor 5 are fixed. , 7) is provided with a fixed side energizing bar 8.

The movable side conducting bar 6 of the movable side contactor 5, which is one of the contacts, is a flexible bellows joined to the central opening edge of the upper end plate 3a inside the hermetic container 4 ( In the form of penetrating the center of the lower seal surface of 9), it is joined to the bellows 9 together with the cover 11 and held so that it can be elevated by the bellows 9.

And the outer end of the movable side energizing bar 6 which is above the holding | maintenance part by the bellows 9 protrudes out of the airtight container 4, and the protruding part is movable with an unshown manipulator of the exterior. A male screw 12 for connecting the side conducting bar 6 is fixedly attached to the outer end of the movable side conducting bar 6 via a soldering layer 13.

The movable contact attachment part 14 which has a cross section of the area larger than the cross section of the said inner-end front-end | tip at the front-end | tip of the inner side of the movable side energizing bar 6 opposite to the outer end to which the male screw 12 is attached. ) Is integrally formed with the movable side energizing bar 6, and the movable contact 15 is fixed to the end face of the movable contact attaching portion 14 through the solder layer 16.

In this way, the movable contact bar, which is integral with the movable contact attaching part 14 and the movable contact attaching part 14, to which the movable contact 15 and the movable contact 15 are fixed and attached via the solder layer 16. (6) The movable contactor 5 is formed by the male screw 12 fixedly attached to the outer end of the movable conducting bar 6 via the soldering layer 13.

Moreover, the outer side edge part of the fixed side energizing bar 8 of the fixed side contactor 7 which is another contactor is joined and fixed to the center opening edge part of the lower end plate 3b. A female screw 17 is joined to and fixed to the outer end portion through the solder layer 20 so as to be embedded from the outer end face.

A fixed contact attachment portion 18 having a cross section of an area larger than a cross section of the inner end portion at an inner end portion of the fixed side conducting bar 8 opposite to an outer end portion on which the female screw 17 is embedded and fixed. ) Is integrally formed with the fixed side energizing bar 8, and the fixed contact 19 is fixed to the end face of the fixed contact attaching portion 18 via the solder layer 21.

In this way, the stationary contact 19, the stationary contact 19 is fixed through the solder layer 21, the stationary contact attachment portion 18 is fixed, the stationary side conducting bar integral with the stationary contact attachment portion 18 (8) The fixed side contactor 7 is formed by the female screw 17 which is embedded in the outer end of the fixed side energizing bar 8 and fixedly attached thereto.

The vacuum valve shown in FIG. 4 having the above-described configuration has a movable side, which is held on the flexible bellows 9 by connecting the manipulator (not shown) and the movable side energizing bar 6 through the male screw 12. The movable contact 15 of the energizing bar 6 operates so that contact and separation with respect to the stationary contact 19 can be carried out, maintaining the airtightness of the airtight container 4.

That is, at the time of energization by the vacuum valve, the movable contact 15 contacts the fixed contact 19, and when any problem occurs, the manipulator (not shown) is outside the movable side energization bar 6 according to a signal from the outside. The end is led out from the upper end plate 3a to the outside, whereby the movable contact 15 fixed to the inner end of the movable side energizing bar 6 is airtight in the hermetic container 4. The contact between the contacts is opened away from the fixed contact 19 while maintaining.

When the movable contact 15 comes into contact with and disconnects from the stationary contact 19, an arc is generated between the contacts, causing a spark to dissipate into the surroundings. In order to protect the inner wall of the circuit, an arc shield 22 is provided between the contact where the movable contact 15 and the fixed contact 19 are disposed opposite and the inner wall of the insulating cylinder 1 has an arc shield 22 at the fixed side conducting bar. It is supported and arranged by (8).

The above-mentioned vacuum valve of FIG. 4 shows the basic structure of the conventional vacuum valve, but when attaching a contactor in this structure, it is fixed with the movable contact 15, the movable side energizing bar 6, and the fixed contact 19. The soldering layer includes a male screw 12 connecting the side conducting bar 8, a movable side conducting bar 6 and an external manipulator, and a female screw 17 connecting the external wiring terminal to the fixed side conducting bar 8, respectively. (16, 21, 13 and 20).

For this reason, when assembling and installing a vacuum valve, laborious preparation, such as forming a soldering layer in advance on the soldering surface, was necessary. In addition, when soldering the male screw 12 connecting the movable side energizing bar 6 and the manipulator or the female screw 17 connecting the external wiring terminal to the fixed side energizing bar 8, the movable side energizing bar 6 ) And the male thread (12) mutually, or the fixed side conduction bar (8) and the female screw (17) mutually had to secure the optimal component dimensions.

In addition, when corrosion resistance is required as the material of the male screw 12, it is necessary to use austenitic stainless steel. Since austenitic stainless steel is inferior in wettability of the brazing material, austenite The screw parts using the stainless steel of the system also required pretreatment such as surface treatment such as Ni plating.

In order to exclude many cumbersome pretreatments for soldering, a vacuum circuit breaker formed by integrating an electrode member and an energizing bar member by solid phase bonding or hot isotropic pressing (HIP) has been proposed. (For example, refer patent document 1).

[Patent Document 1] Japanese Patent Laid-Open No. H07-335092

However, in solid state bonding, sufficient bonding density may not be obtained with respect to the interface strength required for the interface of the bonding. In addition, there is a problem that the solid state joining requires a press machine of 100 t (ton) or more, for example, which increases the processing process.

In addition, hot isostatic pressurization has a sufficient interfacial strength with a higher bonding density than solid-state bonding, but there is a problem that it is cumbersome to handle an apparatus using a high pressure gas.

SUMMARY OF THE INVENTION In view of the above-described conventional situation, the object of the present invention is to integrate the screw portion for connecting the contact and the energizing bar and the external operation part or the wiring by a simple method that does not involve pressure, and also the optimum between the screw part and the energizing bar. It is to provide a contactor structure of a vacuum valve and a method of manufacturing the same that can easily secure the dimensions of the parts.

The contactor structure of the vacuum valve according to the first aspect of the present invention provides a contactor structure of a vacuum valve for the purpose of opening and closing a current supply, while supporting a contact, an energizing bar connected to the contact, and the contact and the energizing bar. It consists of a cylindrical body in which a male thread part was formed in the outer periphery of the edge part opposite to the edge part which supports the said contact part, and the said contact, the electricity supply bar, and each member of the said cylindrical body are comprised integrally.

A contactor structure of a vacuum valve according to a second aspect of the present invention is a contactor structure of a vacuum valve for the purpose of opening and closing of an energized current, comprising: a contact, an energizing bar connected to the contact, and a cylindrical type supporting the contact and the energizing bar. The upper body and the female screw part formed in the said energizing bar at the end opposite to the end part which supports the said contact of the said cylindrical body are comprised, and each member of the said contact, the said energizing bar, the said cylindrical body, and the said female screw part is comprised integrally. .

According to a third aspect of the present invention, there is provided a method for manufacturing a contactor for a vacuum valve, comprising: preparing a cup-shaped cylindrical body having a bottom portion; embedding a base material for an energizing bar in the cylindrical body; and the base material for the energizing bar embedded therein. By the process of holding the molded object which consists of a sintered compact in the opening part of a cylindrical body, and the process of placing a molten material on the upper surface of the said molded object, the said cylindrical body, the base material for the electricity supply bars, the said molded object, and the said infiltration material Forming a granulated body comprising a granulated body formed by powder metallurgy in a non-oxidizing atmosphere, and infiltrating the molded body with the infiltrating member to form a contact at an upper end of the tubular body. Further, the cylindrical body is immersed in the molded body holding portion to integrate the contact and the upper end of the cylindrical body, and the cylindrical body A process of integrating the energizing bar and the tubular body by infiltrating the inside of the tubular body by forming an energizing bar inside the tubular body by integrating the inner part of the tubular body by infiltrating the inside of the tubular body; Removing the bottom of the tubular body to expose the bottom surface of the energizing bar to the outside; and forming a male screw portion on an outer periphery of the end of the tubular body opposite to the end where the contact is formed. It is configured to include.

The method for manufacturing a contactor of a vacuum valve according to a fourth aspect of the invention comprises the steps of preparing a cup-shaped tubular body having a convex portion projecting inwardly at the bottom center, and placing a base material for the conducting bar on the convex portion for the conducting bar. The process of embedding a base material in the said cylindrical body, the process of holding the molded object which consists of a sintered compact in the opening part of the said cylindrical body in which the base material for electricity supply bars was embedded, and the process of putting a infiltration material on the upper surface of the said molded object, A granulated body comprising the tubular body, the base material for the energizing bar, the molded body, and the infiltrating material, wherein the granulated material is heated by powder metallurgy in a non-oxidizing atmosphere. In contact with the upper end of the cylindrical body by infiltrating into the molded body, and further, the molded body holding part of the cylindrical body. By integrating the contact and the upper end of the tubular body, and infiltrating into the tubular body to integrate the base material for the energizing bar to form an energizing bar containing the convex part in the tubular body, and forming an outer periphery of the energizing bar. Integrating the energizing bar and the tubular body by immersing the inner wall of the tubular body, and exposing the bottom surface of the energizing bar surrounding the bottom of the convex part to the outside by removing the bottom of the tubular body; It is comprised including the process of forming a female screw part in the said convex part following the said process.

According to the present invention, it is possible to integrate the threaded portion for connecting to the contact and the energizing bar and the external operation part or the wiring by a simple method that does not involve pressure, and also to easily secure the optimum part dimensions between the threaded part and the energizing bar. The contactor structure of the vacuum valve and its manufacturing method can be provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Example 1)

1 (a) and (b) are diagrams showing an integration process in the method for manufacturing a contact of a vacuum valve according to the present example. On the other hand, the contactor manufactured by the contactor manufacturing method of the vacuum valve according to the present example is a contactor corresponding to the movable side contactor 5 of the vacuum valve shown in FIG.

In the method for manufacturing a contactor of a vacuum valve according to the present example, first, a cup-shaped cylindrical body 26 having a bottom portion 25 is prepared as shown in FIG. The cylindrical body 26 is made of a stainless steel (SUS304) bar as a cup-shaped container having an outer diameter of 16 mm, an inner diameter of 10 mm, and a depth of 25 mm.

And the inside of the said tubular body 26 embeds (charges) the base material 27 for electricity supply bars. The energizing bar base material 27 is an oxygen-free copper block having an outer diameter of about 10 mm and a length of about 10 mm.

Next, the molded body 28 made of a sintered compact is placed on the opening of the tubular body 26 in which the base bar 27 for the energizing bar is embedded and held therein. The molded body 28 is a contact after heating by the infiltration method, and is formed of a Cu-Cr (copper-chromium) sintered body. The shape is molded into a large diameter part of about 15 mm, a small diameter part of about 10 mm, and a thickness of about 10 mm.

The manufacturing method of the molded object 28 which consists of said Cu-Cr sintered compact is as follows. First, Cr powder in which Cr (chromium) deoxidized by Al (aluminum) or the like at the time of dissolution is mechanically pulverized and the particle size is adjusted to 74 µm or less, and the electrolytic method Cu (copper) powder (particle size 44 micrometers or less) produced by Weighing was weighed by 55Cu-Cr mass ratio, and mixed in a V-type mixer.

The mixture is press-molded at 1tonf / cm 2 (98MPa) and then heated to a melting point of Cu or lower at about 1000 DEG C or lower in a non-oxidizing atmosphere to carry out the sintering described in the powder metallurgy method.

In addition, with respect to the Cr raw material powder, various gas molecules, mainly oxygen gas, are released from the contact material due to the melting of the contact due to the arc opening and closing of the contact material used in the vacuum valve. It is easy to cause the rise. Therefore, in order to make the oxygen content as small as possible, deoxidized Cr powder is used.

In addition, although Cu powder obtained by the electrolytic method was used in this Example with respect to Cu powder, even if it is the Cu powder atomized by the atomizing method, there is no problem in particular.

Next, the molded body 28 is placed in the opening of the tubular body 26 in which the base material 27 for energizing bars is embedded as described above, and then the Cu- is placed on the upper surface of the molded body 28 (Cu-Cr sintered body). As an infiltration material for filling the porous hole portion of the Cr sintered body as a contact, an infiltration material 29 made of an oxygen-free copper block having an outer diameter of about 10 mm and a length of about 8 mm was placed.

Thus, in this example, the same material, ie, the deoxidized Cu (copper) block, is used for the base material 27 for electricity supply bars, and the infiltration material 29. As shown in FIG. In addition, the cylindrical body 26 may be any material having a melting point higher than the melting point of the base material 27 for the energizing bar and the infiltration material 29 (in this example, the melting point of Cu (copper)). For example, austenitic stainless steel was used as the base material.

The reason why the austenitic stainless steel is selected as the base material of the tubular body 26 is that the austenitic stainless steel has excellent corrosion resistance, so that parts having corrosion resistance can be obtained without special surface treatment in a later step.

The assembly 30 which consists of the cylindrical body 26, the electricity supply bar base material 27, the molded object 28, and the infiltration material 29 shown in FIG. 1 (a) is formed as mentioned above.

Next, the granulated product 30 arranged as described above is heated to 1200 ° C. in a hydrogen atmosphere, on the base material 27 (Cu block) and the molded body 28 (Cu-Cr sintered body) for the energized bar in the tubular body 26. The placed infiltration material 29 (Cu block) is melted.

Thereby, the infiltration material 29 (Cu block) placed on the molded object 28 (Cu-Cr sintered compact) fills the porous hole part of the molded object 28 (Cu-Cr sintered compact), ie, the so-called infiltration called powder metallurgy. At the same time, the surplus portion of the infiltration material 29 is dropped into the tubular body 26 to form the tubular body 26 together with the base material 27 (Cu block) for the energizing bar disposed in the tubular body 26. ) Solidify within.

FIG.1 (b) is a figure which shows the aspect of the heating coagulation | solidification body 31 after the coagulation | solidification of the heating body obtained in this way. As shown in Fig. 1 (b), the infiltration material 29 shown in Fig. 1 (a) completely disappeared from the molded body 28, and instead, the upper part of the cylindrical body 26, The contact 32 before finishing which consists of a part of the molded object 28 and the infiltration material 29 is formed, and the remainder of the electricity supply bar base material 27 and the infiltration material 29 inside the cylindrical body 26 is formed. The electricity supply bar 33 which consists of) is filled without a gap.

As a result of observing the cross-sectional structure of the solidified body 31 after the heating, the junction interface 34 between the contact 32 and the cylindrical body 26, and the energized bar 33 melt-solidified in the cylindrical body 26 and the inside thereof In the junction part interface 35 between them, it was confirmed that Cu (copper) penetrates into the crystal grain boundary of the cylindrical body 26 in all these interfaces, and each interface part is firmly joined.

Moreover, in the inside 36 of the contact 32, the porous hole was completely filled with the infiltration material 29 (Cu (copper)), and the whole contact was strengthened. In addition, at the interface 37 between the contact 32 and the energizing bar 33, the remainder of the infiltrating member 29 integrated with the energizing bar 33 is the infiltrating member 29 inside the contact 32. ), And it was confirmed that the interface portion was firmly joined here as well.

2 is a view showing the shape after finishing processing of the solidified body 31 after the heating. As shown in Fig. 2, the contact point 32 is rounded to the circumferential edge of the upper surface, for example, by a fillet or the like, and processed into the shape of the contact point of the vacuum valve. And a portion is left for reinforcement of the energizing bar 33 and the other portion is formed with a male thread to be connected to the external manipulator.

That is, the upper part corresponding to about 1/2 of the cylindrical body 26 is left to be cut off to form the flange part 38 as a reinforcement part of the contact point 32 at the junction part with the contact point 32, The remaining body part is cut off about 2/3 of the thickness and the remaining 1/3 thickness part is cut off to form the hollow cylindrical part 39 as a reinforcement part of the conducting bar 33.

And the lower part corresponding to about 1/2 of the cylindrical body 26 which follows the hollow cylindrical part 39, the bottom part 25 shown to FIG. 1 (a), (b) is cut off, and the energizing bar 33 is carried out. The bottom portion of is exposed to the outside, and a male screw portion 41 for connecting to an external manipulator is formed at a lower portion corresponding to about 1/2 of the tubular body 26 after the bottom portion is removed.

In addition, the male screw portion 41 may be formed before heating. When the male thread portion 41 is formed after heating, the male thread portion 41 may be formed and then the bottom portion 25 may be cut off or the male thread portion may be cut off after the bottom portion 25 is cut off. (41) may be formed.

This functionally corresponds to the movable contactor 5 shown in FIG. 4, whereby the end contact 32, the energizing bar 33, and the flange portion 38 as the contact reinforcing portion are firmly joined to each other, and the hollow cylindrical portion is also joined. The contact 42 having a structure in which 39 and the male screw portion 41 are firmly joined to the energizing bar 33 as a reinforcing portion of the energizing bar is completed.

Thus, in this example, since the whole contactor is integrated by heating by the infiltration method, soldering is unnecessary. Therefore, the reinforcement part (flange part 38) of the contact point 32, the reinforcement part (hollow cylinder part 39) of the electricity supply bar 33, and also the male thread part 41 (ablation of the cylindrical body 26) After the remaining portion), even if austenitic stainless steel with poor wettability of the brazing material is used, the excellent corrosion resistance of the austenitic stainless steel can be utilized without using surface treatment such as Ni plating.

In the present embodiment, the Cu-Cr alloy is used as the base metal of the contact 32 as an example. However, the contact material contains one or both of Cu (copper) and silver (Ag). (Cr), tungsten (W), molybdenum (Mo), tantalum (Ta) can be produced even if the composition containing one or more types of metals, and these carbides.

Further, low melting point elements such as tellurium (Te), bismuth (Bi), and lead (Pb) may be added.

Thus, in this example, the structure of the contact of the vacuum valve is integrated with the tubular body and the energizing bar by contact with the infiltration work for forming the contact, and the male thread is formed in the tubular body, so that the parts of each component before heating are Even when the dimensions of the parts are not accurate at the time of assembly and installation, the dimensional relationship between heating and solidification can be appropriately secured centering on the cylindrical body.

In this way, the dimensions between the parts need not be accurate when assembling and installing, and because the soldering process is unnecessary, the process is simplified, and the infiltration method is used to obtain a firm coupling of the interface between parts. The pressurization device is not necessary and it is possible to provide an inexpensive contact.

(Example 2)

3 (a) and 3 (b) show two examples of a method for assembling and installing parts for integration in another contactor manufacturing method of a vacuum valve according to Embodiment 2, and FIG. 3 (c) shows the shape of a contactor after completion. It is sectional drawing shown. The contactor manufactured by the contactor manufacturing method of the vacuum valve according to the present example is a contactor corresponding to the fixed side contactor 7 of the vacuum valve shown in FIG.

The base material of each part used in the contactor manufacturing method of the vacuum valve concerning this example is the same material as the case of FIG. 1 (a), except that some dimensions and shapes are different. In addition, the manufacturing method of each component is also the same as the method demonstrated by FIG.

Therefore, the description of the manufacturing method of the material or the individual components will be omitted here, and only the procedures of the manufacturing method will be described, and FIGS. 3A, 3B, and 1C will be described with reference to FIG. The parts having the same functions as in the case of (b) and (2) are denoted by the same numbers as in Figs. 1 (a), (b) and 2.

First, as shown in FIG.3 (a) or FIG.3 (b), the cup-shaped cylindrical body 26 which has the convex part 45 which protruded inward in the center of the bottom part 25 is prepared. 3 (a) shows the cylindrical body 26 in which the bottom part 25 which has the convex part 45 and the hollow cylinder part 39 were integrally manufactured from the beginning, and FIG. 3 (b) shows the hollow cylinder. Cylindrical body in which the separate parts 46 consisting of the convex part 45 and the bottom part 25 which were manufactured separately from the part 39 were joined by the welding part 47 to the lower end surface of the hollow cylindrical part 39. (26) is shown.

Subsequently, the base material 27 for electricity supply bars is put on the convex part 45, and the electricity supply bar base material 27 is built into the cylindrical body 26. As shown in FIG. And the molded object 28 which consists of a sintered compact is put and maintained in the opening part of the cylindrical body 26 in which the said electricity supply bar base material 27 was built. Further, the infiltration material 29 is placed on the upper surface of the molded body 28.

Thereby, the granulated body 43 or 44 which consists of the cylindrical body 26, the base material 27 for electricity supply bars, the molded object 28, and the infiltration material 29 is formed. Thereafter, the granulated product 43 or 44 is heated at 1200 ° C. by powder metallurgy in a non-oxidizing atmosphere (eg, hydrogen atmosphere).

By the said heating, the infiltration material 29 on the molded object 28 and the base material 27 for electricity supply bars in the cylindrical body 26 are melted. In addition, the infiltration material 29 fills (invades) the porous hole portion of the molded body 28 and the excess infiltration material 29 is dropped into the cylindrical body 26.

As a result, the surplus infiltration material 29 and the conductive bar base material 27 that are integrated in the tubular body 26 surround the convex portion 45 and are solidified after being filled in the tubular body 26.

In the melt-solidified form, the convex portion 45 is formed integrally with the base material 27 for the energizing bar in the tubular body 26, and the thickness of the tubular body 26 forms a male screw. It is the same as that of the post-heating coagulation | solidification body 31 shown in FIG. 1 (b) except that it is the thickness of the hollow cylindrical part 39 thinner than this rather than the thickness.

That is, the infiltration material 29 infiltrated into each part is strengthened inside the upper end part of the cylindrical body 26 as shown in FIG.3 (c) (However, FIG.3 (c) shows the shape after finishing). The contact 32 is formed, and is infiltrated into the upper end (molded body holding part) of the cylindrical body 26 to integrate the upper end of the contact 32 and the cylindrical upper body 26.

Further, the infiltrated infiltrate 29 is dipped (infiltrated) in the tubular body 26 to be integrated with the base material 27 for the energized bar, and the tubular body 33 includes the energized bar 33 containing the convex portion 45. 26). Further, the energizing bar 33 is infiltrated into the inner wall of the tubular body 26 at its outer periphery, whereby the energizing bar 33 and the tubular body 26 are integrated.

Thereafter, the bottom portion 25 of the tubular body 26 is removed to expose the bottom surface of the energizing bar 33 surrounding the bottom portion of the convex portion 45 to the outside, and the female screw portion 48 is formed on the convex portion 45. ).

The female screw portion 48 may be formed before heating. When the female screw portion 48 is formed after heating, the female screw portion 48 may be formed and then the bottom portion 25 may be cut off or the female portion may be cut off after the bottom portion 25 is cut off. (48) may be formed.

Thereby, the hollow cylindrical part of the cylindrical body 26 as a reinforcement part of the end contact 32, the energizing bar 33, and the energizing bar 33 functionally corresponded to the stationary side contactor 7 shown in FIG. A contactor having a structure in which the 39 and the contact point 32 are firmly joined, and the hollow cylindrical part 39 and the energizing bar 33 and the energizing bar 33 and the female threaded part 48 are firmly joined. 49 is completed.

Thus, even in this case, since the whole contactor is integrated by heating by the infiltration method, soldering is unnecessary. Therefore, even when an austenitic stainless steel having poor wettability of the brazing material is used as the reinforcing portion (hollow cylindrical portion 26) of the energizing bar 33 and the female screw portion 48 (the convex portion 45), Ni It is possible to utilize the excellent corrosion resistance of the austenitic stainless steel without using surface treatment such as plating.

Thus, in this example, the structure of the contact of the vacuum valve is integrated with the tubular body having the convex portion at the bottom and the energizing bar and the contact with the invasion operation for forming the contact, and the female screw portion is formed at the convex portion. Even if the dimensions of the components before assembling and installing each component are not accurate, the dimensional relations after heating and solidification can be appropriately secured centering on the cylindrical body.

In this way, since the dimensions between the parts need not be accurate during assembly and installation, and soldering is unnecessary, the process is simplified, and the infiltration method is used to obtain a firm coupling of the interface between parts. No need for a large pressurization device can provide inexpensive contacts.

In addition, although the contact 42 of Example 1 corresponded to the movable side contact of a vacuum valve, and the contact 49 of Example 2 corresponded to the fixed side contact of a vacuum valve, it was not limited to this, The contactor 42 of the first embodiment may be the fixed side contactor, and the contactor 49 of the second embodiment may be the movable side contactor, and both the movable side contactor and the fixed side contactor are constituted by the contactor 42 of the first embodiment. Alternatively, the contactor 49 of the second embodiment may be used.

1 (a) and 1 (b) are views showing an integration process in the method for manufacturing a contact of a vacuum valve according to the first embodiment.

2 is a view showing the shape after finishing processing of the coagulated body after heating in the contactor manufacturing method of the vacuum valve according to the first embodiment.

3 (a) and 3 (b) show two examples of a method for assembling and installing parts for integration in another contactor manufacturing method of the vacuum valve according to the second embodiment, and (c) shows the shape of the contactor after completion. It is sectional drawing which shows.

4 is a cross-sectional view showing the main part configuration of a conventional vacuum valve.

          Explanation of symbols on the main parts of the drawings

1: Insulation cylinder 2a, 2b: Metallizing

3a: upper end plate 3b: lower end plate

4: airtight container 5: movable contactor

6: movable side energizing bar 7: fixed side contactor

8: fixed side energizing bar 9: bellows

11 cover 12 male thread

13 solder layer 14 movable contact attachment portion

15: movable contact 16: solder layer

17: female thread 18: fixed contact attachment portion

19: fixed contact 20, 21: solder layer

22: arc shield 25: bottom

26: cylindrical body 27: the base material for the energized bar

28: molded body 29: infiltration material

30: assembly 31: solidified body after heating

32: contact point 33: energizing bar

34: Interface between contact and cylindrical body 35: Interface between cylindrical body and energizing bar

36: Inside contact 37: Interface between contacts and energizing bars

38 flange portion 39 hollow cylindrical portion

41: male part 42: contactor

43,44: Assembly 45: Convex

46: separate parts 47: welds

48: female thread 49: contact

Claims (16)

As a contactor of a vacuum valve for the purpose of opening and closing of energized current, A cylindrical body having a flange at the upper end and a male screw formed at the lower outer periphery; Filled inside the tubular body except for the upper part having the flange, exposed to the outside of the lower surface, and integrated with the tubular body at the interface with the inner wall of the tubular body by infiltration material infiltrated by heating. Energized baa, The upper surface of the flange is a shape in which the upper portion is widened and the lower portion is filled in the part of the upper portion having the flange inside the cylindrical body, the upper surface of the flange by the infiltration material infiltrated by heating And an inner wall of a portion of the upper portion having the flange of the tubular member, and a contact integrated with an upper end surface of the energizing bar. As a contactor of a vacuum valve for the purpose of opening and closing of energized current, A cylindrical body with openings at both ends, It is filled except for the empty area which went into the inside of the predetermined length from the upper opening of the said cylindrical body, and the cylindrical area which entered inside the predetermined length from the center of the lower opening of the said cylindrical body, and exposes a lower surface to the outside, and invades by heating. An energizing bar integrated with the tubular body at the interface with the inner wall of the tubular body by infiltration material; The upper part of the tubular body is placed on the edge portion of the upper opening, and the lower part is filled in the empty area of the tubular body, and the shape of the tubular body is formed by the infiltration material infiltrated by heating. A contact point integrated with the edge portion, an inner wall of the empty region of the tubular body, and an upper end surface of the energizing bar; The energizing bar is made of a small cylindrical body of a shape inserted into the cylindrical region that enters a predetermined length from the center of the lower end opening of the cylindrical body formed of an unfilled portion, and an internal thread is formed on the inner wall, And a female screw integrated with the energizing bar at an interface between the outer circumferential surface of the small cylindrical body and the inner wall of the tubular region formed by the energizing bar by the infiltrating member infiltrated by the infiltrating member. Contact of vacuum valve. The method according to claim 1 or 2, The contact is a contact of a vacuum valve, characterized in that the fixed contact or a movable contact arranged to be separated and in contact with the fixed contact. The method according to claim 1 or 2, The said contact is formed by the immersion method, The contactor of the vacuum valve characterized by the above-mentioned. The method according to claim 1 or 2, The contact contains one or both of Cu (copper) and silver (Ag), and is made of Cr (chromium), W (tungsten), Mo (molybdenum), Ta (tantalum), and carbides thereof. Contacts of vacuum valves. The method of claim 5, The contact point of the vacuum valve, characterized in that the contact contains at least one element of Te (tellurium), Bi (bismuth), Pb (lead). The method of claim 1, The said cylindrical member or the cylindrical member in which the male thread part was formed is a contactor of the vacuum valve characterized by using austenite stainless as a base material. (1) preparing a cup-shaped tubular body having a bottom portion; (2) embedding the base material for the energizing bar in the tubular body; (3) a step of holding a molded body made of a sintered body in the opening of the tubular body in which the base material for the energizing bar is embedded; (4) by the step of placing the infiltration material on the upper surface of the molded body, Consists of the tubular body, the base material for the energizing bar, the molded body and the infiltration material, (5) performing the step of heating the granulated product in a non-oxidizing atmosphere by a powder metallurgy method to obtain the granulated material,     (Iii) infiltrating into the molded body to form a contact in the upper end of the cylindrical body,     (Ii) further immersing the molded body holding portion of the cylindrical body to integrate the contact and the upper end of the cylindrical body,     (Iii) further infiltrating the inside of the tubular body and integrating with the base material for the energizing bar to form an energizing bar in the tubular body;     (Iii) integrating the energizing bar and the tubular body by immersing an outer circumference of the energizing bar on an inner wall of the tubular body; (6) removing the bottom of the tubular body and exposing the bottom of the energizing bar to the outside; (7) A step of forming a male screw portion on an outer periphery of the end of the tubular body opposite to the end where the contact is formed. Contactor manufacturing method of the vacuum valve comprising a. (1) a step of preparing a cup-shaped tubular body having a convex portion projecting inwardly at the bottom center; (2) placing the base material for the energizing bar on the convex part and embedding the base material for the energizing bar in the tubular body; (3) a step of holding a molded body made of a sintered body in the opening of the tubular body in which the base material for the energizing bar is embedded; (4) by the step of placing the infiltration material on the upper surface of the molded body, And constitute an assembly comprising the tubular body, the base material for the energizing bar, the molded body, and the infiltration material, (5) performing the step of heating the granulated product by powder metallurgy in a non-oxidizing atmosphere by the infiltration material,     (Iii) infiltrating into the molded body to form a contact in the upper end of the cylindrical body,     (Ii) further immersing the molded body holding portion of the cylindrical body to integrate the contact and the upper end of the cylindrical body,     (Iii) further, by infiltrating the inside of the tubular body and integrating with the base material for the current conducting bar to form an energizing bar containing the convex part in the tubular body,     (Iii) integrating the energizing bar and the tubular body by immersing an outer circumference of the energizing bar on an inner wall of the tubular body; (6) removing the bottom of the tubular body to expose the bottom surface of the energizing bar surrounding the bottom of the convex portion to the outside; (7) A step of forming a female screw portion in the convex portion subsequent to the above process Contactor manufacturing method of the vacuum valve comprising a. The method of claim 8, The said cylindrical member or the cylindrical member in which the male thread part was formed is a contactor manufacturing method of the vacuum valve characterized by using austenite stainless as a base material. The method according to claim 8 or 9, The said base material for energizing bars and the said immersion material are Cu (copper) materials, The manufacturing method of the contactor of the vacuum valve characterized by the above-mentioned. The method according to claim 8 or 9, The molded body contains one or both of Cu (copper) and silver (Ag), and is made of Cr (chromium), W (tungsten), Mo (molybdenum), Ta (tantalum), and carbides thereof. Contactor manufacturing method of the vacuum valve. The method of claim 12, The molded body includes at least one element of Te (tellurium), Bi (bismuth), and Pb (lead). The method according to claim 8 or 9, The contact is a contact manufacturing method of the vacuum valve, characterized in that the fixed contact or the movable contact arranged to be separated and contact with the fixed contact. 3. The method of claim 2, The said cylindrical member or the said female thread part is a contactor of the vacuum valve characterized by using austenite stainless as a base material. The method of claim 9, The method of manufacturing a contact of a vacuum valve, wherein the tubular member or the female thread portion is made of austenitic stainless steel.

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