JP6130633B2 - Resin mold vacuum valve - Google Patents

Description

Embodiments described herein relate generally to a resin mold vacuum valve in which a vacuum valve is molded with a thermosetting resin such as an epoxy resin or a polyester resin.

2. Description of the Related Art Conventionally, a vacuum valve having a pair of contactable and separable contacts molded with epoxy resin and subjected to external insulation reinforcement is known (for example, see Patent Document 1). In addition, an electric field relaxation shield that surrounds a sealing metal fitting is embedded in a molded insulating layer to achieve electric field relaxation and stress relaxation (for example, see Patent Document 2).

This type of resin mold vacuum valve is shown in FIG. In a cylindrical vacuum insulating container 1 made of ceramics, a fixed-side sealing fitting 2 is sealed at one end opening, and a movable-side sealing fitting 3 is sealed at the other opening. A fixed-side energizing shaft 4 is fixed through the fixed-side sealing metal fitting 2, and a fixed-side contact 5 is fixed to the end. A movable side contact 6 that faces the fixed side contact 5 and is detachable is fixed to the end of the movable side energizing shaft 7 that movably penetrates the movable side sealing fitting 3. One end of a telescopic bellows 8 is sealed at the intermediate portion of the movable side energizing shaft 7 and the other end is movable side sealing fitting 3.
Is sealed. A cylindrical arc shield 9 is provided on the outer periphery of the contacts 5 and 6 to prevent diffusion of metal vapor. These constitute a vacuum valve.

An insulating layer 10 in which an epoxy resin is molded is provided on the outer periphery of the vacuum valve, and both end portions are tapered interface connection portions. On the fixed side of the insulating layer 10, a hook-shaped fixed-side electric field relaxation shield 11 is provided in which the outer peripheral portion 11 a surrounds the fixed-side sealing fitting 2 and the inner peripheral portion 11 b penetrates the fixed-side conductive shaft 4. Bolts 12 pass through the inner peripheral portion 11 b perpendicular to the axial direction, and are fastened and fixed to the fixed-side energizing shaft 4.

On the movable side as well as the fixed side, the outer peripheral portion 13a surrounds the movable-side sealing fitting 3, and the inner peripheral portion 13b.
Is provided with a bowl-shaped movable-side electric field relaxation shield 13 movably penetrating the movable-side energizing shaft 7. Bolts 14 pass through the inner peripheral portion 13 b in parallel with the axial direction, and are fastened and fixed to the convex portions 3 a of the movable side sealing fitting 3. The inner peripheral portion 13b extends to the end of the insulating layer 10,
The resin does not enter the movable side energizing shaft 7 during molding. The inner diameter is slightly larger than the outer diameter of the movable energizing shaft 7.

Thereby, external insulation reinforcement of the vacuum valve can be performed, and the electric field relaxation shields 11, 1
3, the electric field relaxation and stress relaxation in the insulating layer 10 can be achieved. However, depending on the manufacturing tolerance and assembly accuracy of the electric field relaxation shields 11 and 13, the clearance between the sealing fittings 2 and 3 may be several meters.
It becomes difficult to maintain a predetermined value of m (1 to 3 mm). In particular, on the fixed side, the fixed side energizing shaft 4
Since the inner peripheral portion 11b of the fixed-side electric field relaxation shield 11 is fixed to, the eccentricity becomes large. In the drawing, the eccentric state is exaggerated, but the outer peripheral portion 11a is in contact with the vacuum insulating container 1 as indicated by point A, or the outer peripheral portion 13a is larger than the vacuum insulating container 1 as indicated by point B. Something happens to leave. In such a state, at point A, the electric field strength increases at the contact point, and at point B, it becomes difficult to prevent the progress of cracks from the end of the sealing fitting 3.

JP 2001-286018 A JP2011-48997A

The problem to be solved by the present invention is to maintain electric field relaxation between the outer peripheral portions 11a and 13a of the electric field relaxation shields 11 and 13 provided so as to surround the sealing fittings 2 and 3 at a predetermined interval, An object of the present invention is to provide a resin mold vacuum valve capable of stress relaxation.

In order to solve the above problems, a resin mold vacuum valve according to an embodiment includes a cylindrical vacuum insulating container, a fixed-side sealing metal fitting sealed at both ends of the vacuum insulating container, a movable-side sealing metal fitting, A fixed energizing shaft that is fixedly penetrated to the fixed-side sealing metal fitting, a fixed contact that is fixed to an end of the fixed energizing shaft, a movable contact that contacts and separates from the fixed contact, and the movable contact A movable side energizing shaft that moves the movable side sealing bracket in an airtight manner, a fixed side fixing ring fixed to the fixed side sealing bracket, and a bolt fixed to the fixed side fixing ring. A fixed-side electric field relaxation ring provided so as to surround the fixed-side sealing metal fitting, a movable-side fixing ring fixed to the movable-side sealing metal fitting, and a bolt fixed to the movable-side fixing ring, Enclose the movable side sealing bracket And the movable electric field relaxation ring provided, characterized in that and an insulating layer provided on an outer periphery of the vacuum insulating vessel.

Sectional drawing which shows the structure of the resin mold vacuum valve which concerns on Example 1 of this invention. The principal part expanded sectional view which shows the structure of the fixing ring and bolt which concern on Example 1 of this invention. The principal part expanded sectional view which shows the structure of the fixing ring and electric field relaxation ring which concern on Example 2 of this invention. The principal part expanded sectional view which shows the structure of the fixing ring and electric field relaxation ring which concern on Example 3 of this invention. Sectional drawing which shows the structure of the conventional resin mold vacuum valve.

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

First, a resin mold vacuum valve according to a first embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view showing a configuration of a resin mold vacuum valve according to a first embodiment of the present invention, FIG.
These are the principal part expanded sectional views which show the structure of the fixing ring and bolt which concern on Example 1 of this invention. In addition, the same code | symbol was attached | subjected to the component similar to the past.

As shown in FIG. 1, in a cylindrical vacuum insulating container 1 made of ceramics, a fixed-side sealing fitting 2 is sealed at one end opening, and a movable-side sealing fitting 3 is sealed at the other end opening. Has been. A fixed-side energizing shaft 4 is fixed through the fixed-side sealing metal fitting 2, and a fixed-side contact 5 is fixed to the end. A movable side contact 6 that faces the fixed side contact 5 and is detachable is fixed to the end of the movable side energizing shaft 7 that movably penetrates the movable side sealing fitting 3. One end of a telescopic bellows 8 is sealed to the middle portion of the movable side energizing shaft 7 and the other end is sealed to the movable side sealing fitting 3. Contact 5,
A cylindrical arc shield 9 is provided on the outer periphery of 6 to prevent diffusion of metal vapor. The configuration of these vacuum valves is the same as the conventional one.

An insulating layer 10 in which an epoxy resin is molded is provided on the outer periphery of the vacuum valve, and both end portions are tapered interface connection portions. On the fixed side of the insulating layer 10, the fixed-side sealing fitting 2
The fixed-side fixing ring 20 having the same outer diameter is fixed to the upper surface of the figure by spot welding or the like. An annular fixed-side electric field relaxation ring 21 having an L-shaped cross-section surrounding the fixed-side sealing fitting 2 is fixed to the fixed-side fixing ring 20 with bolts 22.

On the movable side of the insulating layer 10, similarly to the fixed side, a movable side fixing ring 23 having the same outer diameter is fixed to the lower surface of the movable side sealing fitting 3 in the drawing. The movable side fixing ring 23 includes
An annular movable side electric field relaxation ring 24 having an L-shaped cross section surrounding the movable side sealing fitting 3 is a bolt 2.
It is fixed at 5. A movable side cylinder 26 extending to the end of the insulating layer 10 is fixed to the convex portion 3 a of the movable side sealing metal fitting 3 with a bolt 27. The electric field relaxation rings 21 and 24 correspond to the outer peripheral portion of the conventional electric field relaxation shield, and the movable side tube 26 corresponds to the inner peripheral portion of the conventional movable side electric field relaxation shield. A grounding layer can be provided on the outer periphery of the insulating layer 10.

  Next, the bolts 22, 25 and 27 will be described with reference to FIG.

As shown in FIG. 2, the bolts 22, 25 and 27 are provided with a plurality of grooves 28 in the threaded portion. A plurality of grooves 29 are also provided in the screw portion on the fixing rings 20 and 23 side. Groove 2
8, 29 are provided on at least one side.

With these configurations, the electric field relaxation rings 21 and 24 can be fixed to the vacuum insulating container 1 with a predetermined distance of several mm. Fixing ring 2 having the same outer diameter as sealing fittings 2 and 3
Since 0 and 23 and the electric field relaxation rings 21 and 24 are provided after the manufacture of the vacuum valve, they are not subjected to a thermal history at the time of manufacturing the vacuum valve, are less likely to cause distortion or eccentricity, and are vacuum-insulated in the circumferential direction. A predetermined distance from the container 1 can be reliably maintained. Also, since the bolts 22, 25 and 27 are provided with the grooves 28, a small amount of residual air can be exhausted at the time of molding, and the voidless insulating layer 10 can be obtained.

According to the resin mold vacuum valve of Example 1 above, the fixing ring 20,
23, and the electric field relaxation rings 21 and 24 that cover the ends of the sealing fittings 2 and 3 are fixed to the fixing rings 20 and 23, so that the vacuum insulating container 1 and the electric field relaxation rings 21 and 24 The interval can be maintained at a predetermined value in the circumferential direction. Thereby, electric field relaxation and stress relaxation of the insulating layer 10 can be achieved.

Next, a resin mold vacuum valve according to Example 2 of the present invention will be described with reference to FIG. FIG. 3 is an enlarged cross-sectional view of a main part showing configurations of a fixing ring and an electric field relaxation ring according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that positioning is provided in the electric field relaxation ring. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals,
Detailed description thereof is omitted. The electric field relaxation ring will be described using the fixed side.

As shown in FIG. 3, the fixed-side electric field relaxation ring 21 is provided with a stepped portion 30 into which the outer peripheral portion of the fixed-side fixed ring 20 is fitted.

According to the resin mold vacuum valve of Example 2 above, the vacuum insulating container 1 and the electric field relaxation ring 2
The interval with 1 can be more reliably maintained at a predetermined value.

Next, a resin mold vacuum valve according to Example 3 of the present invention will be described with reference to FIG. FIG. 4 is an enlarged cross-sectional view of a main part showing configurations of a fixing ring and an electric field relaxation ring according to Example 3 of the present invention. The third embodiment is different from the first embodiment in that positioning is provided in the electric field relaxation ring. In FIG. 4, the same components as those in the first embodiment are denoted by the same reference numerals,
Detailed description thereof is omitted. The electric field relaxation ring will be described using the fixed side.

As shown in FIG. 4, the fixed-side electric field relaxation ring 21 is provided with a protruding portion 31, and the fixed-side fixing ring 20 is provided with a step portion 32 into which the protruding portion 31 is fitted.

Here, the stepped portion 32 and the protruding portion 31 including the stepped portion 30 of Example 2 are referred to as fitting means for determining the position of the fixed-side electric field relaxation ring 21.

According to the resin mold vacuum valve of Example 3 above, similarly to Example 2, the vacuum insulating container 1
And the electric field relaxation ring 21 can be more reliably maintained at a predetermined value.

According to the embodiment as described above, the distance between the vacuum insulating container and the electric field relaxation ring provided so as to cover the sealing metal fitting can be kept at a predetermined value, and the electric field relaxation and stress relaxation of the insulating layer can be performed. Can be planned.

Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

1 Vacuum insulation container 2 Sealing fittings 2, 3
3a Protrusions 4, 7 Conducting shafts 5, 6 Contacts 8 Bellows 9 Arc shield 10 Insulating layers 11, 13 Electric field relaxation shields 12, 14, 22, 25, 27 Bolts 11a, 13a Outer peripheral parts 11b, 13b Inner peripheral parts 20, 23 Fixing rings 21 and 24 Electric field relaxation ring 26 Movable side cylinders 28 and 29 Grooves 30 and 32 Step part 31 Projection part

Claims (4)

A tubular vacuum insulated container;
A fixed-side sealing fitting sealed at both ends of the vacuum insulating container, a movable-side sealing fitting, and
A fixed-side energizing shaft that is fixedly penetrated to the fixed-side sealing fitting;
A fixed-side contact fixed to the fixed-side energizing shaft end;
A movable contact that contacts and separates from the fixed contact;
A movable side energizing shaft that fixes the movable side contact and moves the movable side sealing fitting in an airtight manner,
A fixed-side fixing ring fixed to the fixed-side sealing metal fitting,
A fixed-side electric field relaxation ring that is fixed to the fixed-side fixing ring with a bolt, and is provided so as to surround the fixed-side sealing fitting;
A movable side fixing ring fixed to the movable side sealing bracket;
A movable side electric field relaxation ring fixed to the movable side fixing ring with a bolt and provided so as to surround the movable side sealing metal fitting,
An insulating layer provided on the outer periphery of the vacuum insulating container;
A resin mold vacuum valve characterized by comprising:   The resin mold vacuum valve according to claim 1, wherein a groove is provided in a screw portion of the bolt.   3. The resin mold according to claim 1, wherein outer diameters of the fixed side fixing ring and the fixed side sealing metal fitting, and the movable side fixing ring and the movable side sealing metal fitting are the same. Vacuum valve.   4. The fitting means for determining a position is provided in the fixed side fixing ring and the fixed side sealing metal fitting, and the movable side fixing ring and the movable side sealing metal fitting. 5. The resin mold vacuum valve according to claim 1.

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