JPH07272600A - Vacuum valve - Google Patents

Abstract

PURPOSE:To obtain a vacuum valve by which a guide can be fixed to a tip plate by means of an inexpensive device through simple operation by providing a locking means on the tip plate of a vacuum valve and constituting the valve so as to engage the protrusion part of the guide with the locking means. CONSTITUTION:Air tightness is maintained on both end surfaces of a cylindrical insulation vessel 1, tip plates 2 and 6 are connected there respectively, a air tight vessel is constituted, and a removable fixed electrode part 4A and a movable electrode 5A are provided in the air tight vessel. And, a guide means 8 for movably supporting the movable electrode part 5A in the air tight vessel is provided on the tip plate 6. The following constitution is added to such a vacuum valve. A recessed part (for example, stepped hole 6A) is provided on the tip plate 6, and at least one projection part 8C to be engaged with the recessed part is provided for the guide means 8. Since the guide means 8 is mounted on the tip plate 6 by pressing the guide means 8 into the stepped hole 6A of the tip plate 6, the mounting process is extremely simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a vacuum valve used in a vacuum switch.

[0002]

2. Description of the Related Art FIG. 12 shows, for example, JP-A-58-169.
FIG. 8 is a cross-sectional view of a conventional vacuum valve shown in Japanese Patent Publication No. 830. In the figure, a tubular metal fitting 32 having a flange 31 is connected to both ends of a tubular insulating container 30. End plates 33A and 33B are joined to both flanges 31 to form an airtight container. A fixed side current-carrying shaft 34 is provided so as to penetrate the central portion of the end plate 33A, and a fixed side electrode 34A is provided at the tip thereof. The movable-side electrode 35A that comes into contact with and separates from the electrode 34A is provided at the tip of the movable-side energization shaft 35. A bellows 38 is provided between the movable side energizing shaft 35 and the end plate 33B so that the energizing shaft 35 can move while maintaining airtightness. A guide 36 made of an insulating material for supporting the current-carrying shaft 35 is provided at the center of the end plate 33B. The guide 36 includes a tubular portion 36A and a flange portion 36B. The energization shaft 35 is inserted into the tubular portion 36A so that the energization shaft 35 can move smoothly in the axial direction. The guide 36 is assembled in the recess 33C at the center of the end plate 33B,
The flange portion 36B is held by a disc-shaped guide retainer 37 having a hole in the center thereof. The guide retainer 37 is assembled with the guide 36 and then laser welded to the end plate 33.
Welded to B. In laser welding, for example, eight spots 37A on the circumference of the guide presser 37 are welded on the circumference. Electron beam welding may be used instead of laser welding.

[0003]

In the conventional structure described above, spot welding is performed by laser welding in order to fix the guide retainer 37, so expensive laser welding equipment is required, and welding work is also required. Since it takes time, it is difficult to reduce the product price, and it was an issue to improve this point.

An object of the present invention is to obtain a vacuum valve which can fix a guide to an end plate by a simple operation using an inexpensive device.

An object of the present invention is to obtain a vacuum valve capable of fixing the guide to the end plate with a relatively small pressure.

An object of the present invention is to obtain a vacuum valve having a large attachment holding force between the guide and the end plate.

An object of the present invention is to obtain a vacuum valve in which the guide and the end plate do not rotate relative to each other.

An object of the present invention is to obtain a vacuum valve capable of fixing a guide having a simple structure to an end plate.

An object of the present invention is to obtain a vacuum valve which can fix a guide to an inexpensive end plate with a simple structure.

[0010]

A vacuum valve according to the present invention is constructed so that both end faces of a cylindrical insulating container are joined to each other while airtightness is maintained to form an airtight container, which can be contacted with and separated from the airtight container. A fixed valve portion and a movable electrode portion, and a guide means for movably supporting the movable electrode portion in the airtight container is provided in the end plate, the vacuum valve is provided with a concave portion in the end plate, The means is provided with at least one protrusion that joins the recess.

[0011]

The projection of the guide means is engaged with the concave portion of the end plate so that the guide means is held by the end plate.

Further, a ring-shaped member is inserted into the recess of the end plate and the recess of the guide means to fix them.

[0013]

【Example】

[First Embodiment] FIG. 1 is a sectional view of a vacuum valve according to a first embodiment of the present invention, and FIG. 2 is a partial sectional view of an end plate 6 seen from a direction of an arrow II-II. In FIG. 1, a dish-shaped metal end plate 2 is joined to the lower end of an insulating container 1 made of a tubular insulating material, and a fixed-side metal current-carrying rod 4 penetrates through the central portion thereof. It is fixed. A fixed-side electrode 4A is provided on the upper end of the current-carrying rod 4.

A metal end plate 6 is provided on the upper end of the insulating container 1 via a metal tubular member 3. At the center of the end plate 6, a stepped hole 6A into which a plastic guide 8 for supporting the movable metal conducting rod 5 is inserted is provided. In the hole 6A, the diameter of the hole 6B in the upper surface portion of the end plate 6 is smaller than the diameter of the hole 6C in the lower surface portion. At the lower end of the current-carrying rod 5, a movable-side electrode 5A that comes in contact with and separates from the electrode 4A is provided. A metal bellows 7 is provided between the current-carrying rod 5 and the end plate 6 so that the current-carrying rod 5 can move in the axial direction while maintaining airtightness. These tubular container 1, metal member 2, tubular member 3, end plate 6 and bellows 7
The airtight container is constituted by.

The guide 8 is made of an insulating material such as plastic and has a flange 8A, a tubular portion 8B having a hole 8E, and a projection 8C. Guides 10, 12, 1 in all other embodiments described in sequence below.
4, 17, 19, 23 and 25 are also made of an insulating material such as plastic similar to the guide 8. As shown in FIG. 2, two protrusions 8C are provided on the outer periphery of the tubular portion 8B, and the lower surface in FIG. 1 has a sloped portion 8D. When the guide 8 is inserted into the hole 6A of the end plate 6, pressure is applied to the surface of the projection 8C while the current-carrying rod 5 is passed through the hole 8E of the guide 8, and the guide 8 is press-fitted from the upper surface of the end plate 6.
As a result, the protrusion 8C is deformed by the pressure applied to the taper portion 8D, the length in the radial direction thereof is temporarily reduced, and the protrusion 8C passes through the hole 6B. The projection 8C has a large diameter hole 6C
When it reaches, the shape returns to the original shape and is held by the stepped portion 6D so that it cannot be pulled out. In the first embodiment, the number of the protrusions 8C is two as shown in FIG. 2, but one or three or more protrusions 8C may be provided.

According to the first embodiment, since the guide 8 is attached to the end plate 6 by pressing the guide 8 into the stepped hole 6A of the end plate 6, the attaching process is extremely simplified. Since the press-fitting can be performed in an extremely short time using an inexpensive device such as a press machine, the manufacturing cost becomes low.

[Second Embodiment] FIG. 3 is a sectional view showing a main part including a metal end plate 6, a plastic guide 10 and a movable metal conducting rod 5 in a second embodiment of the vacuum valve of the present invention. Is. The other configuration is the first shown in FIG.
The illustration is omitted because it is similar to the embodiment. In the second embodiment, as shown in the main part of FIG. 3, the conducting rod 5 is inserted into the lower end of the guide 10 having the diameter of the hole 10G where the protrusion 10C is provided at a symmetrical position with respect to the central axis thereof. Hole 1
The diameter is made larger than 0E, the thickness of the base portion 10F of the projection 10C is made thin, and a gap is provided between the back surface 10G of the projection 10C and the energizing rod 5. As a result, the portion of the protrusion 10C has increased flexibility and can be pressed in with a small pressure as compared with the first embodiment. Also in this second embodiment, the number of the protrusions 10C may be arbitrarily selected from two or more.

[Third Embodiment] FIG. 4 is a cross-sectional view showing a main part including a metal end plate 11, a plastic guide 12 and a movable metal conducting rod 5 in a third embodiment of the vacuum valve of the present invention. It is a figure. The other structure is similar to that of the first embodiment shown in FIG. 1, and is not shown. In the third embodiment, the end plate 11 is provided with an annular groove 11A coaxial with the hole 11C for passing the current-carrying rod 5.
The guide 12 has a tubular portion 12F having a hole 12A for inserting the current-carrying rod 5 and a flange 12B connected thereto,
Another tubular portion 12C is provided on the outer peripheral portion of the flange 12B. The tubular portion 12C has at least two protrusions 12
D is explained, and it has a slope 12E at its lower end. When attaching the guide 12 to the end plate 11,
By applying pressure to the surface of the flange 12B, the projection 12D bends inward in the radial direction and the hole 11B of the end plate 11 is bent.
And is inserted into the groove 11A. In the third embodiment, since the protrusion 12D is provided on the outer peripheral portion of the guide 12, the protrusion 12D can be increased in size. as a result,
The attachment holding force between the guide 12 and the end plate 11 increases.

[Fourth Embodiment] FIG. 5 is a plan view of an essential part of a vacuum switch according to a fourth embodiment of the present invention, and FIG. 6 is a sectional view of the same part. In this embodiment, the structure other than the metal end plate 13, the plastic guide 14 and the movable metal conducting rod 15 shown in FIG. 6 is the same as that of the first embodiment shown in FIG. ing. In FIG. 6, the end plate 13
Has a pin 13A on its outer surface. When the guide 14 is inserted into the hole 13B of the end plate 13, the pin 13A is inserted into the hole 14A provided in the flange of the guide 14 and acts as a detent for the end plate 13 and the guide 14.

As shown in FIG. 5, in the fourth embodiment, the hole 14A of the guide 14 is hexagonal, and the conducting rod 15 having a hexagonal cross section is inserted into this hole 14A. Therefore, the current carrying rod 1
5 does not rotate with respect to the guide 14. Pin 13
Since the guide 14 also does not rotate with respect to the end plate 13 due to the detent of A, the energizing rod 15 does not rotate with respect to the end plate 13. In the first embodiment shown in FIG. 1, since there is no detent as in the fourth embodiment, when a rotational force is applied to the movable-side conducting rod 5, the conducting rod 5 rotates and the bellows 7 is twisted. This may shorten the life of the bellows 7. On the other hand, in the fourth embodiment, since the bellows 7 is not twisted, its life is extended.

[Fifth Embodiment] FIG. 7 is a plan view of an essential part of a vacuum switch according to a fifth embodiment of the present invention, and FIG. 8 is a sectional view of the same part. In the present embodiment, the metal current-carrying rod 15 has the same hexagonal cross section as that of the fourth embodiment, and is inserted into the plastic guide 17 having the corresponding hexagonal hole. The guide 17 has a shape similar to that of the guide 12 of the third embodiment shown in FIG. 4, and a tubular portion 17C is provided on the outer peripheral portion of the flange 17B of the guide 17.
The tubular portion 17C is provided with at least two protrusions 17D.

On the other hand, the metal end plate 16 is provided with a recess 16A, and at least two notches 16B are provided on the outer peripheral portion thereof. Guide 17 to end plate 16
The projection 17D of the guide 17, the end plate 16
It is positioned so as to be inserted into the notch portion 16B and is press-fitted. In the fifth embodiment, the tubular portion 17C inserted into the cutout portion 16B functions as a rotation stopper. Further energizing rod 1
Since 5 has a hexagonal cross section, neither the guide plate 17 nor the conducting rod 15 rotates. Therefore, the energizing rod 15 and the end plate 16 do not rotate and the bellows (see FIG. 1) attached to the energizing rod 15 is not twisted.

[Sixth Embodiment] FIG. 9 is a sectional view of the essential portions of a sixth embodiment of the vacuum switch according to the present invention. In FIG.
A groove 18B is provided on the inner wall of a hole 18A provided at the center of the metal end plate 18. In addition, the plastic guide 19 is inserted into the hole 18A as well.
When inserted in A, the groove 19 is provided at a position corresponding to the groove 18B.
A is provided. The ring 20 is a member formed by forming a metal wire having elasticity into a circular shape and cutting a part of the circumferential shape. When inserting the guide 19 into the hole 18A of the end plate 18, the ring 20 is previously inserted into the groove 18B or the groove 19A. When the ring 20 is inserted into the groove 18B, the ring 20 is inserted when the guide 19 is inserted into the hole 18A.
Expands. The guide 19 is inserted into the hole 18A, and the groove 1
When 8B and the groove 19A face each other, the ring 20 returns to its original position and is positioned between both grooves as shown in FIG. 9 to prevent the guide 19 from coming off. If the ring 20 is previously inserted into the groove 19A, the ring 20 is contracted when the guide 19 is inserted into the hole 18A. Then, the ring 20 facing the groove 19A or the groove 18B is opened and returned to its original state as shown in FIG. In the sixth embodiment, the guide 19 has a simple structure having no protrusions, so that the manufacturing cost thereof is low.

[Seventh Embodiment] FIG. 10 is a sectional view of the essential portions of a seventh embodiment of the vacuum valve according to the present invention. In the figure, the plate-shaped metal end plate 21 has a hole 21A.
An annular fixing member 22 made of metal or plastic and coaxial with the hole 21A is fixed to the upper surface of 1 by welding or the like. The fixing member 22 has a groove 22A on the outer peripheral portion thereof. The plastic guide 23 inserted into the hole 21A of the end plate 21 has a tubular portion 23B on the outer periphery of the flange 23A.
have. The tubular portion 23B has at least two protrusions 23C toward the inside. When the guide 22 is attached to the end plate 21, a pressing force is applied to the flange 23A to press it. In the seventh embodiment, the manufacturing cost is reduced because the structure of the end plate 21 is simple.

[Eighth Embodiment] FIG. 11 is a sectional view of the essential portions of an eighth embodiment of the vacuum switch according to the present invention. This embodiment is similar to the seventh embodiment of FIG. 10, and is different from the seventh embodiment in that an annular metal or plastic fixing member 2 is used.
The structure of 4 is simpler than the fixing member 22 of FIG. That is, the annular fixing member 24 has the step portion 2 on the outer peripheral portion.
4A is formed, and the stepped portion 24A holds the projection 25A of the plastic guide 25 having a structure similar to that of the seventh embodiment. In this eighth embodiment, the fixing member 24
Since the structure of is simpler than the fixing member 22 of the seventh embodiment, the manufacturing cost is further reduced.

[0026]

According to the present invention, the guide can be fixed to the end plate by providing the end plate of the vacuum switch with the locking means and engaging the locking means with the protrusion of the guide. When the two are engaged, it is only necessary to press fit the protruding portion of the guide to the end plate, so that the fixing can be performed by a simple operation with an inexpensive device.

Further, by thinning the thickness of the base of the projection and providing a gap on the back surface of the projection, the flexibility of the projection is increased, and the projection can be pressed in with a small pressure.

Further, by providing the protrusion on the outer peripheral portion of the guide, the protrusion can be made large and the attachment holding force is increased.

Further, by inserting the projection of the end plate into the hole provided in the guide, it acts as a whirl stop, thereby preventing damage to the bellows.

Further, the end plate is provided with a notch, and the projection of the guide is inserted into this notch to act as a rotation stopper, thereby preventing damage to the bellows.

Further, a manufacturing cost is reduced by providing a groove at a position where the end plate and the guide face each other and inserting a ring-shaped member into the groove.

Further, in the case where the end plate is provided with the annular fixing member and the projection of the guide is inserted thereinto, the manufacturing cost of the end plate is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a vacuum valve according to a first embodiment of the present invention.

FIG. 2 is a partial sectional view of the first embodiment.

FIG. 3 is a sectional view of a portion including an end plate, a guide, and a current-carrying shaft (hereinafter referred to as a main portion) of a second embodiment of the vacuum valve of the present invention.

FIG. 4 is a sectional view of an essential part of a third embodiment of the vacuum valve of the present invention.

FIG. 5 is a plan view of an essential part of a fourth embodiment of the vacuum valve of the present invention.

FIG. 6 is a sectional view of an essential part of the fourth embodiment.

FIG. 7 is a plan view of the essential parts of a fifth embodiment of the vacuum valve of the present invention.

FIG. 8 is a sectional view of an essential part of the fifth embodiment.

FIG. 9 is a sectional view of the essential parts of a sixth embodiment of the vacuum valve of the present invention.

FIG. 10 is a sectional view of the essential parts of a seventh embodiment of the vacuum valve of the present invention.

FIG. 11 is a sectional view of an essential part of an eighth embodiment of the vacuum valve of the present invention.

FIG. 12 is a sectional view of a conventional vacuum valve.

[Explanation of symbols]

 1 Cylindrical Insulation Container 2, 6 End Plate 4 Fixed Side Energizing Rod 5 Movable Side Energizing Rod 6C Hole 8 Guide 8C Protrusion 13 End Plate 13A Pin 14 Guide 14A Hole 15 Movable Side Energizing Rod 18 End Plate 18A Hole 18B Groove 19 Guide 19A groove 20 ring 21 end plate 22 fixing member 22A groove 23 guide 23C projection

Claims (7)

[Claims] 1. An airtight container is formed by joining end plates to both end faces of a cylindrical insulating container while maintaining airtightness, and a fixed electrode part and a movable electrode part that can be contacted and separated are provided in the airtight container.
In a vacuum valve in which guide means for movably supporting the movable electrode portion in the airtight container is provided in the end plate, a recess is provided in the end plate, and the guide means is provided.
A vacuum valve provided with at least one protrusion that engages with the recess. 2. The vacuum valve according to claim 1, wherein a gap is provided around a portion of the protrusion that engages with the recess. 3. The vacuum valve according to claim 1, wherein the recess is provided in an annular shape on the outer surface of the end plate, and the at least two protrusions are provided on the outer peripheral portion of the guide means. 4. The movable electrode portion has a predetermined non-circular cross-sectional shape, and the shape of a portion of the guide means that supports the movable electrode portion that contacts the movable electrode portion is the predetermined non-circular cross-section. 2. The vacuum valve according to claim 1, wherein the vacuum valve has substantially the same shape, and the end plate is provided with at least one protrusion, and the guide means is provided with a hole for engaging with the protrusion. 5. The annular recess having at least two notches is provided on the outer surface of the end plate, and the at least two protrusions are provided on the outer peripheral portion of the guide means. Vacuum valve. 6. The end plate has a hole into which a guide means is inserted, the inner wall of the hole has a first groove, and the guide means has a second groove opposed to the first groove. The vacuum valve according to claim 1, wherein a ring-shaped member having elasticity is provided in each of the first groove and the second groove. 7. The vacuum valve according to claim 1, further comprising an annular fixing member provided on the end plate, the guide member having an annular fixing member having a recess, and a protrusion engaging with the recess of the fixing member.