Mold vacuum valve

Abstract

To provide a technique for remarkably improving efficiency of reutilization (reuse) and recycling (recycle) of valve components by easily separating the valve components such as an insulation resin layer and a vacuum valve from each other.SOLUTION: A mold vacuum valve comprises a vacuum valve P1 in which a pair of electrodes E1 and E2 is stored so as to be opened / closed, an insulation resin layer P2 which is molded so as to cover the vacuum valve, and a variable layer 11 which is provided together with the insulation resin layer so as to cover at least a part of an entire outer side of the vacuum valve and deformable by actuating an external load. Before the external load is actuated, the variable layer is maintained in a state integrated with the insulation resin layer and after the external load is actuated, the variable layer is deformed into a state different from the insulation resin layer, thereby separating the insulation resin layer from the vacuum valve.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] Embodiments of the present invention relate to a molded vacuum valve.

Background Art

[0002] As a switching device for power reception and distribution provided in buildings and large facilities, for example, a switchgear equipped with a switch such as a circuit breaker or a disconnector is known. A vacuum valve is applied to the switchgear as a component of the switch. The inside of the vacuum valve is maintained in a certain insulating state by an insulating container, and a pair of electrodes are accommodated in the insulating container so as to be openable and closable (separable and connectable). In this case, by opening and closing (separating and connecting) the pair of electrodes, an accident current is interrupted and a load current is switched, and power is stably supplied from the switchgear.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, as the above-described vacuum valve, there is one molded with an insulating resin layer so as to cover the outside (for example, a molded vacuum valve). In the molded vacuum valve, an existing coupling process is performed between the vacuum valve and the insulating resin layer, whereby the insulating resin layer is firmly adhered to the vacuum valve without gaps, and as a result, the insulating performance of the vacuum valve is maintained constant.

[0005] In recent years, from the perspective of environmental harmony, there has been a demand for the reuse (recycle) and recycling (reclamation) of the components constituting the mold vacuum valve (hereinafter referred to as valve components). Here, focusing on the vacuum valve as a valve component and the insulating resin layer, if the insulating resin layer can be separated from the vacuum valve, these valve components can be efficiently reused (recycle) and recycled (reclamation).

[0006] However, the insulating resin layer is composed of a resin material (for example, epoxy resin, unsaturated polyester resin) excellent in insulation, impact resistance, heat resistance, chemical resistance, etc., and is firmly adhered to the vacuum valve. For this reason, it is extremely difficult to separate the insulating resin layer from the vacuum valve, and as a result, it cannot be denied that the efficiency of reuse (recycle) and recycling (reclamation) of the valve components is significantly reduced.

[0007] An object of the present invention is to provide a technique for dramatically improving the efficiency of reuse (recycle) and recycling (reclamation) of these valve components by easily separating valve components such as an insulating resin layer and a vacuum valve from each other.

Means for Solving the Problems

[0008] According to the mold vacuum valve according to the embodiment, a vacuum valve that accommodates a pair of electrodes in an openable and closable manner, an insulating resin layer molded so as to cover the vacuum valve, and at least a part of the entire outside of the vacuum valve are provided together with the insulating resin layer so as to cover it, and a variable layer that can be deformed by applying an external load, and the variable layer is maintained in an integrated state with the insulating resin layer before applying the external load, and after applying the external load, it is deformed into a state different from that of the insulating resin layer, enabling the insulating resin layer to be separated from the vacuum valve.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0010] "First Embodiment" FIG. 1 is an internal structure diagram of the mold vacuum valve P according to the present embodiment. The mold vacuum valve P includes a vacuum valve P1 that accommodates a pair of electrodes E1 and E2 so as to be openable and closable (separable and connectable), and an insulating resin layer P2 formed so as to cover the outside of the vacuum valve P1.

[0011] In the example of FIG. 1, the vacuum valve P1 includes a fixed electrode E1, a movable electrode E2, an insulating container 1 (also referred to as a vacuum container), a fixed-side sealing member 2, a movable-side sealing member 3, an airtight maintenance mechanism 4, and an arc shield 5. The fixed electrode E1, the movable electrode E2, the airtight maintenance mechanism 4, and the arc shield 5 are accommodated in the insulating container 1.

[0012] The insulating container 1 has a composite hollow cylindrical shape in which a fixed-side insulating barrier tube 1a and a movable-side insulating barrier tube 1b are connected to each other, and is formed of an insulating material such as alumina ceramic, for example. The fixed-side sealing member 2 and the movable-side sealing member 3 are composed of a metal material mainly containing stainless steel, for example.

[0013] As shown in FIG. 1, the hollow cylindrical insulating container 1 has a concentric shape centered on a virtual axis Px that defines the center of the vacuum valve P. The insulating container 1 has both ends opened when viewed in the direction of the virtual axis Px. Both openings (fixed-side opening K1, movable-side opening K2) are covered by the fixed-side sealing member 2 and the movable-side sealing member 3.

[0014] The arc shield 5 has a hollow cylindrical shape extending in the direction of the virtual axis Px, and is made of a metal material mainly composed of, for example, copper or stainless steel. The arc shield 5 is fixed to the insulating container 1 so as to accommodate the fixed contact point 6 of the fixed electrode E1 and the movable contact point 8 of the movable electrode E2 described later inside thereof (inside).

[0015] Fig. 1 shows an example of the fixing method of the arc shield 5. That is, the arc shield 5 has an annular flange portion 5f. The flange portion 5f protrudes from the arc shield 5 toward the insulating container 1 and extends along the circumferential direction.

[0016] In this case, in a state where the flange portion 5f is interposed between the above-described fixed-side insulating bushing 1a and the movable-side insulating bushing 1b, the flange portion 5f is clamped by these two insulating bushings 1a and 1b. At this time, the space between the flange portion 5f and the insulating bushings 1a and 1b is joined by silver brazing. Thereby, the arc shield 5 is fixed to the insulating container 1 via the flange portion 5f.

[0017] The fixed electrode E1 and the movable electrode E2 are concentrically configured around the virtual axis Px and extend in alignment along the virtual axis Px. In this state, the fixed electrode E1 and the movable electrode E2 are positioned so as to face each other in parallel.

[0018] The fixed electrode E1 includes a fixed contact point 6 and a fixed current-carrying shaft 7. The movable electrode E2 includes a movable contact point 8 and a movable current-carrying shaft 9. The fixed contact point 6 and the movable contact point 8 have a disk shape with the same diameter, and are made of, for example, an alloy of a current-carrying material such as Cu or Ag and an arc-resistant material such as chromium (Cr), tungsten (W), or tungsten carbide (WC). The fixed current-carrying shaft 7 and the movable current-carrying shaft 9 have a cylindrical shape with the same diameter and are made of a material with high conductivity (for example, Cu).

[0019] The fixed contact point 6 is connected to one end of the fixed current-carrying shaft 7, and the other end of the fixed current-carrying shaft 7 is fixed to the vacuum valve P1 in a non-movable manner along the virtual axis Px via the fixed-side sealing member 2. The movable contact point 8 is connected to one end of the movable current-carrying shaft 9, and the other end of the movable current-carrying shaft 9 is connected to an operating mechanism (not shown) via the movable-side sealing member 3.

[0020] Here, the operating mechanism moves the movable current-carrying shaft 9 along the virtual axis Px. Thereby, the movable contact point 8 can be separated from and contacted with the fixed contact point 6. As a result, the vacuum valve P1 (i.e., the pair of electrodes E1, E2) can be opened and closed (separated and contacted).

[0021] An airtightness maintaining mechanism 4 is arranged between the movable current-carrying shaft 9 and the movable-side sealing member 3. The airtightness maintaining mechanism 4 is composed of a bellows having elasticity, and the bellows (airtightness maintaining mechanism) 4 is composed of a thin metal such as stainless steel, for example. The bellows 4 forms a bellows shape that can expand and contract in the direction of the virtual axis Px and covers the outside of the movable current-carrying shaft 9 without a gap.

[0022] One end of the bellows 4 is joined to the movable-side sealing member 3 without a gap, and the other end is joined to the movable current-carrying shaft 9 without a gap. Thereby, the inside of the insulating container 1 is always maintained in an airtight state (i.e., a vacuum state). As a result, when the vacuum valve P1 is opened and closed, even while the movable current-carrying shaft 9 is being moved along the virtual axis Px, the atmosphere (air) does not enter the inside of the insulating container 1.

[0023] Such a vacuum valve P1 is molded into, for example, a cylindrical contour by the insulating resin layer P2. The insulating resin layer P2 is molded so as to cover the outside of the vacuum valve P1 (i.e., the insulating container 1, the sealing members 2, 3) without a gap. The insulating resin layer P2 is composed of a thermosetting resin such as an epoxy resin or an unsaturated polyester resin, for example.

[0024] The vacuum valve P1 formed into a cylindrical contour by the insulating resin layer P2 includes a conductive grounding layer 10 provided so as to cover the outside of the insulating resin layer P2. The grounding layer 10 is formed by applying, for example, a conductive paint to the outer periphery of the cylindrical insulating resin layer P2 and is grounded.

[0025] By the way, for the molded vacuum valve P as described above, reuse (recycle) and recycling of the components (for example, the vacuum valve P1, the insulating resin layer P2) constituting it are required. For this reason, the molded vacuum valve P has a variable layer 11 that can be deformed by applying an external load described later.

[0026] The variable layer 11 is provided together with the insulating resin layer P2 so as to cover at least a part of the entire outside of the vacuum valve P1. In the example of FIG. 1, the variable layer 11 is provided between the vacuum valve P1 and the insulating resin layer P2 and is adhesively bonded to the outside of the vacuum valve P1 without a gap.

[0027] As shown in FIG. 1, the variable layer 11 extends without a gap from the outside of the insulating container 1 (the fixed-side insulating barrier tube 1a, the movable-side insulating barrier tube 1b) to the outside of the sealing members 2 and 3, and a part 11p thereof is provided so as to be exposed to the outside.

[0028] The portion (also referred to as the exposed surface) 11p exposed to the outside is formed at both ends of the variable layer 11 when viewed in the direction of the virtual axis Px. The portion (exposed surface) 11p exposed to the outside is formed in a concentric shape around the virtual axis Px.

[0029] The portion (exposed surface) 11p exposed to the outside is configured as an external load acting portion 11p for applying an external load described later. The external load can be defined as a superordinate concept of, for example, thermal, electrical, mechanical, and chemical stimuli.

[0030] By applying an external load to the external load application part 11p, the variable layer 11 can be transformed into a form different from its original state. Specifically, the variable layer 11 is maintained in an integrated state with the insulating resin layer P2 before the external load is applied. And after the external load is applied, the variable layer 11 transforms into a state different from the insulating resin layer P2.

[0031] As a variation of transforming into a different state, it is assumed that after the external load is applied, the variable layer 11 becomes more vulnerable than the insulating resin layer P2 (for example, becomes softer, more easily breakable, or more easily soluble). By making the variable layer 11 more vulnerable in this way, it becomes possible to easily separate the insulating resin layer P2 from the vacuum valve P1.

[0032] The material or characteristics of the variable layer 11 are set according to the type of the above-mentioned external load. Hereinafter, the material or characteristics of the variable layer 11 will be described for each type of external load (for example, thermal stimulus, electrical stimulus, mechanical stimulus, chemical stimulus).

[0033] First, assume a thermal stimulus (for example, heating) as the external load. At this time, the external load application part 11p is configured as a part for applying the thermal stimulus. The variable layer 11 is configured to be transformable by the thermal stimulus.

[0034] As for the transformation due to the thermal stimulus, for example, if the temperature that makes the variable layer 11 vulnerable due to thermal deformation such as the melting point, glass transition temperature, or deflection temperature of the variable layer 11 is lower than the temperature that makes the insulating resin layer P2 vulnerable, it is possible to transform only the variable layer 11 without altering the insulating resin layer P2.

[0035] Here, focusing on the material of the variable layer 11, when the insulating resin layer P2 is composed of a thermosetting resin (a resin that cures when heated) as described above, the variable layer 11 is preferably composed of a thermoplastic resin having insulating properties (a resin that softens when heated). Examples of the thermoplastic resin having insulating properties include polyetheretherketone resin (PEEK), polyvinyl chloride resin (PVC), ABS resin, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), and the like.

[0036] On the other hand, focusing on the characteristics of the variable layer 11, the linear expansion coefficient (thermal expansion coefficient) of the variable layer 11 is set to be larger than the linear expansion coefficient (thermal expansion coefficient) of the insulating resin layer P2. The linear expansion coefficient (thermal expansion coefficient) refers to the ratio of the expansion of the length or volume of an object caused by a temperature rise. A material with a large linear expansion coefficient (thermal expansion coefficient) has a large ratio of expansion of length or volume.

[0037] Note that since the thermoplastic resin has a low adhesive strength with different materials, when the variable layer 11 is composed of the thermoplastic resin, it is preferable to perform a coupling treatment or a plasma treatment on the object to which the variable layer 11 is adhered (for example, the outside of the insulating container 1 or the sealing members 2 and 3), or to roughen the object. Thereby, it becomes possible to adhere the variable layer 11 made of the thermoplastic resin to the outside of the vacuum valve P1 without a gap due to the anchor effect.

[0038] Subsequently, as an external load, an electrical stimulus (for example, voltage application, current application) is assumed. At this time, the external load acting portion 11p is configured as a portion for applying an electrical stimulus. The variable layer 11 is configured to be deformable by an electrical stimulus.

[0039] As for transformation by electrical stimulation, for example, if the electrical property that causes the variable layer 11 to be weakened by Joule heat during energization is superior to the electrical property that causes the insulating resin layer P2 to be weakened, it is possible to transform only the variable layer 11 without altering the insulating resin layer P2. Also, by applying a high-frequency current to the variable layer 11, a rapid temperature rise occurs at the interface between the variable layer 11 and the insulating resin layer P2, and it becomes possible to separate the variable layer 11 and the insulating resin layer P2 by utilizing the stress generated due to the difference in the coefficient of thermal expansion between the variable layer 11 and the insulating resin layer P2.

[0040] Here, focusing on the material of the variable layer 11, the variable layer 11 is preferably composed of a resin material having conductivity. As the resin material having conductivity, for example, a material obtained by adding a conductive material (carbon fiber) to the above-described polyether ether ketone resin (PEEK) can be applied.

[0041] On the other hand, focusing on the characteristics of the variable layer 11, the conductivity of the variable layer 11 is set to be larger than the conductivity of the insulating resin layer P2. Conductivity is synonymous with electrical conductivity and refers to an index indicating the ease of electric current flow in an object. A material with a large conductivity (electrical conductivity) has less electrical resistance, so electric current flows more easily.

[0042] Note that it is also possible to capture the electrical property of the variable layer 11 in terms of electrical resistivity. In this case, the electrical resistivity of the variable layer 11 is set to be smaller than the electrical resistivity of the insulating resin layer P2. Electrical resistivity refers to an index indicating the difficulty of electric current flow in an object. A material with a small electrical resistivity has less electrical resistance, so electric current flows more easily.

[0043] Next, as an external load, mechanical stimuli (e.g., impact, vibration) are assumed. At this time, the external load acting portion 11p is configured as a portion for applying mechanical stimuli. The variable layer 11 is configured to be transformable by mechanical stimuli.

[0044] As a transformation by mechanical stimulation, for example, if the structural strength that makes the variable layer 11 vulnerable by impact or vibration is lower than the structural strength that makes the insulating resin layer P2 vulnerable, it is possible to transform only the variable layer 11 without altering the insulating resin layer P2.

[0045] Here, focusing on the material of the variable layer 11, the variable layer 11 is preferably composed of a resin material whose structural strength is lower than that of the insulating resin layer P2. As a resin material that satisfies this, for example, inorganic materials such as glass, polystyrene, biodegradable plastics, etc. can be applied.

[0046] On the other hand, focusing on the characteristics of the variable layer 11, the impact resistance of the variable layer 11 is set to be lower than that of the insulating resin layer P2. Impact resistance refers to an index of the difficulty of breaking when receiving an impact. A material with low impact resistance is more likely to break due to its weaker structural strength.

[0047] In addition, by making the variable layer 11 have a porous structure, the structural strength (i.e., impact resistance) of the variable layer 11 itself can be reduced. The porous structure can be realized, for example, by winding a sheet-like member manufactured as a porous structure, such as material application by spraying that is easy to mix air or a material having foaming properties, around the vacuum valve P1.

[0048] Furthermore, as an external load, chemical stimuli (e.g., application of a chemical solution, immersion in a chemical solution) are assumed. At this time, the external load acting portion 11p is configured as a portion for applying a chemical stimulus. The variable layer 11 is configured to be transformable by a chemical stimulus. In addition, the external load includes a chemical stimulus by drug input (injection). At this time, the external load acting portion 11p (i.e., the portion for applying a chemical stimulus) is configured as a drug input (injection) portion 11p for inputting (injecting) a drug to cause transformation. In this case, in order to improve the input (injection) accuracy or input (injection) efficiency of the chemical solution, the drug input (injection) portion 11p is preferably configured in a different manner (form) from other portions, such as by marking a mark as a display means for the input (injection) location, or by providing a convex portion or a concave portion only at that location.

[0049] As transformation by a chemical stimulus, for example, if the resistance of the variable layer 11 to being weakened by application of a chemical solution or immersion in a chemical solution is lower than the resistance of the insulating resin layer P2 to being weakened, it is possible to transform only the variable layer 11 without altering the insulating resin layer P2.

[0050] Here, focusing on the material of the variable layer 11, the variable layer 11 is preferably made of a thermoplastic resin with low chemical resistance. As a thermoplastic resin with low chemical resistance, for example, since those with solubility parameters close to those of the chemical used and the variable layer 11 are applicable, the type of the thermoplastic resin is not particularly limited.

[0051] On the other hand, focusing on the characteristics of the variable layer 11, the chemical resistance of the variable layer 11 is set lower than that of the insulating resin layer P2. Chemical resistance refers to the durability of an object against the chemical used. A material with low chemical resistance is likely to dissolve (dissolution reaction) or swell (swelling reaction).

[0052] Note that, by forming the variable layer 11 into a porous structure (particularly, an open pore (open cell) structure), the chemical solution from the external load acting portion 11p can easily penetrate into the interior of the variable layer 11. At this time, it is assumed that the insulating resin layer P2 remaining in the variable layer 11 dissolved by the chemical is also in a porous structure, which promotes the ease of separation of the insulating resin layer P2.

[0053] As described above, according to the present embodiment, by applying an external load (thermal, electrical, mechanical, chemical stimuli) to the external load acting portion 11p, it is possible to transform (i.e., weaken) the variable layer 11 into a state different from the insulating resin layer P2. Thereby, it becomes easier to separate the insulating resin layer P2 from the vacuum valve P1. As a result, the vacuum valve P1 and the insulating resin layer P2 as valve components can be efficiently reused and recycled.

[0054] Here, assuming the case where the external load acting portion 11p is heated at a preset temperature as a thermal stimulus, before the insulating resin layer P2 is deteriorated (thermally deformed) by heat, the variable layer 11 becomes soft due to thermal deformation. Thereby, the strong adhesion state between the vacuum valve P1 and the insulating resin layer P2 is eliminated. At this time, it becomes a state where the insulating resin layer P2 can be easily separated from the vacuum valve P1. As a result, the vacuum valve P1 and the insulating resin layer P2 can be efficiently reused and recycled.

[0055] Also, assuming the case where a voltage (current) is applied to the external load acting portion 11p as an electrical stimulus, before the insulating resin layer P2 is deteriorated (softened) by energization, the variable layer 11 becomes soft due to Joule heat. Thereby, the strong adhesion state between the vacuum valve P1 and the insulating resin layer P2 is eliminated. At this time, it becomes a state where the insulating resin layer P2 can be easily separated from the vacuum valve P1. As a result, the vacuum valve P1 and the insulating resin layer P2 can be efficiently reused and recycled.

[0056] Furthermore, assuming that an impact is applied to the external load application part 11p as a mechanical stimulus, the variable layer 11 is destroyed or pulverized by the impact before the insulating resin layer P2 is altered (crushed) by the impact. As a result, the strong adhesion state between the vacuum valve P1 and the insulating resin layer P2 is eliminated. At this time, the insulating resin layer P2 can be easily separated from the vacuum valve P1. As a result, the vacuum valve P1 and the insulating resin layer P2 can be efficiently reused and recycled.

[0057] And assuming that a chemical solution is applied to the external load application part 11p as a chemical stimulus (or the external load application part 11p is immersed in the chemical solution), the variable layer 11 is dissolved (or chemically cracked) by the chemical solution before the insulating resin layer P2 is altered (dissolved, chemical crack) by the chemical solution. As a result, the strong adhesion state between the vacuum valve P1 and the insulating resin layer P2 is eliminated. At this time, the insulating resin layer P2 can be easily separated from the vacuum valve P1. As a result, the vacuum valve P1 and the insulating resin layer P2 can be efficiently reused and recycled.

[0058] In addition, a structure for further promoting the above-described effects can be applied to the molded vacuum valve P of the present embodiment. As an example of the application of this structure, the variable layer 11 has a separation starting part 11t that can be a starting point when separating the insulating resin layer P2 from the vacuum valve P1.

[0059] The separation starting part 11t is configured by thickening a part 11s of the variable layer 11 more than other parts. As an example of the thickening method, as shown by the two-dot chain line in FIG. 1, the separation starting part 11t has a contour shape that protrudes toward the insulating resin layer P2 more than other parts in a part 11s of the variable layer 11.

[0060] In FIG. 1, as an example, a part 11s of the variable layer 11 assumes the central part 11s of the variable layer 11 when viewed in the direction of the virtual axis Px. The separation starting part 11t is provided in this central part 11s and is configured to be continuous along the circumferential direction. As the contour shape of the separation starting part 11t, for example, shapes such as a triangular cross-section shape, an arc-shaped cross-section shape, and a rectangular cross-section shape can be applied.

[0061] As shown in FIG. 1, in the variable layer 11, a separation starting part 11t having a triangular cross-section is provided at its central part 11t. With this structure, it becomes possible to further improve the ease of separation of the insulating resin layer P2 from the vacuum valve P1.

[0062] At this time, the insulating resin layer P2 is in a state where the contour shape of the separation starting part 11t with a triangular cross-section is inverted and transferred. As a result, a part P2s (the part corresponding to the reference sign 11s) of the insulating resin layer P2 has a contour shape sunken in a triangular cross-section. In other words, the insulating resin layer P2 has a contour shape in which the inner surface of a part P2s thereof (that is, the surface facing (contacting) the variable layer 11) is recessed in a triangular cross-section in a direction away from the vacuum valve P1. In another way of thinking, the insulating resin layer P2 has a contour shape in which a part P2s thereof is thinned to a triangular cross-section.

[0063] On the other hand, before applying an external load (thermal, electrical, mechanical, chemical stimuli) to the external load acting part 11p, the insulating resin layer P2 is integrated with the variable layer 11, and thereby a part P2s thereof is maintained in a state supported by the variable layer 11.

[0064] Here, as described above, assume a case where an external load (thermal, electrical, mechanical, chemical stimuli) is applied to the external load acting portion 11p to transform (weaken) the variable layer 11. In this case, the insulating resin layer P2 and a part P2s thereof are in a state where the support by the variable layer 11 as described above is released. As a result, when pressure is applied to the insulating resin layer P2 when separating it from the vacuum valve P1, the pressure energy can be concentrated on the thinned part P2s. As a result, it becomes possible to cut or break the insulating resin layer P2 starting from the part P2s.

[0065] "Second Embodiment" FIG. 2 is an external configuration diagram of the molded vacuum valve P according to the present embodiment. This embodiment is an improvement of the above-described first embodiment, and the other configurations and effects are the same as those of the first embodiment except that a plurality of dividing portions 12 are provided in the insulating resin layer P2, so the description thereof is omitted. Hereinafter, the description will be limited to the improved portion.

[0066] As shown in FIG. 2, the molded vacuum valve P has a plurality of dividing portions 12 formed by cutting out at least a part of the insulating resin layer P2. As the configuration of the dividing portion 12, both a variation that penetrates the insulating resin layer P2 and a variation that depresses (concaves) the insulating resin layer P2 without penetrating it are assumed.

[0067] In any variation, the insulating resin layer P2 divided by the dividing portion 12 is molded together with the variable layer 11 so as to cover the vacuum valve P1.

[0068] In FIG. 2, as an example, two dividing portions 12 are provided along a direction parallel to the virtual axis Px that defines the center of the vacuum valve P. Both dividing portions 12 have a point-symmetrical positional relationship about the virtual axis Px.

[0069] As described above, according to the present embodiment, since the insulating resin layer P2 is pre-divided into two by the dividing portion 12, in a state where the variable layer 11 is made vulnerable as in the above-described first embodiment, the insulating resin layer P2 can be easily decomposed along the dividing portion. Thereby, the ease of separation of the insulating resin layer P2 from the vacuum valve P1 can be further improved.

[0070] Furthermore, according to the present embodiment, a material similar to the variable layer 11 of the above-described first embodiment may be filled or interposed with respect to the dividing portion 12. Thereby, the ease of decomposition of the insulating resin layer P2 itself can be improved. Note that the number of the dividing portions 12 is not limited to the two described above, and may be set to three or more.

[0071] "First Modification" FIG. 3 is an internal configuration diagram of the molded vacuum valve P according to this modification. In the above-described first embodiment, it was assumed that the variable layer 11 was adhesively bonded to the outside of the vacuum valve P1 without a gap and a part 11p thereof was exposed to the outside. Instead, in this modification, it is assumed that the variable layer 11 is provided inside the insulating resin layer P2 adhesively bonded to the outside of the vacuum valve P1 without a gap.

[0072] As shown in FIG. 3, the variable layer 11 of this modification is interposed inside the insulating resin layer P2, and exposed portions (exposed surfaces) 11p are formed at both ends thereof. In this case, the variable layer 11 is interposed inside the insulating resin layer P2 so as to be non-contact with the vacuum valve P1 (in other words, separated from the vacuum valve P1). Note that since the other configurations are the same as those of the above-described first embodiment, the description thereof is omitted.

[0073] As described above, according to this modification example, by arranging the variable layer 11 so as not to be in contact with the vacuum valve P1, the degree of freedom in material selection for constituting the variable layer 11 can be increased. That is, when the variable layer 11 is in contact with the vacuum valve P1, in addition to the adhesion performance with the insulating container 1 which is an inorganic material and the sealing members 2 and 3 which are metal materials, insulation performance for preventing electrical degradation due to partial discharge in a high electric field region is required. Therefore, there are certain restrictions on the material selection of the variable layer 11. However, in the variable layer 11 of this modification example, such restrictions can be eliminated.

[0074] Furthermore, according to this modification example, since the insulating resin layer P2 can be adhered to the outside of the vacuum valve P1 without a gap, while maintaining the same insulation performance as the existing molded vacuum valve P, it is possible to make it easier to separate the insulating resin layer P2 from the vacuum valve P1. In addition, since other effects are the same as those of the first embodiment described above, the description thereof is omitted.

[0075] "Second Modification Example" FIG. 4 is an internal configuration diagram of the molded vacuum valve P according to this modification example. In the first embodiment described above, a variable layer 11 that is adhesively bonded to the outside of the vacuum valve P1 without a gap and a part 11p of which is exposed to the outside was assumed. Instead of this, in this modification example, a variable layer 11 that is adhesively bonded to the outside of the vacuum valve P1 without a gap without exposing a part 11p thereof to the outside is assumed.

[0076] As shown in FIG. 4, the variable layer 11 of this modification example is adhesively bonded to the outside of the insulating container 1 without a gap and is interposed between the vacuum valve P1 and the insulating resin layer P2, and both ends thereof are covered with the insulating resin layer P2. In addition, since other configurations are the same as those of the first embodiment described above, the description thereof is omitted.

[0077] As described above, according to this modified example, by opening the through-hole 13 that reaches the variable layer 11 in a part of the insulating resin layer P2 (continuously or intermittently along the circumferential direction), both ends of the variable layer 11 can be exposed to the outside through this through-hole 13. In this state, external load acting portions 11p similar to those in the above-described first embodiment are formed at both ends of the variable layer 11. As a result, the above-described external load (thermal, electrical, mechanical, chemical stimuli) can be applied to the external load acting portion 11p. Note that since other effects are the same as those in the above-described first embodiment, the description thereof is omitted.

[0078] "Third Modified Example" FIG. 5 is an internal configuration diagram of the molded vacuum valve P according to this modified example. In the above-described first embodiment, it was assumed that the variable layer 11 was adhesively bonded to the outside of the vacuum valve P1 without a gap and a part 11p thereof was exposed to the outside. Instead, in this modified example, it is assumed that the variable layer 11 is adhesively bonded to the outside of the vacuum valve P1 without a gap without exposing a part 11p thereof to the outside.

[0079] As shown in FIG. 5, the variable layer 11 of this modified example is adhesively bonded to the outside of the sealing members 2 and 3 without a gap, and is interposed between the vacuum valve P1 and the insulating resin layer P2, and the whole thereof is covered with the insulating resin layer P2. Note that since other configurations are the same as those in the above-described first embodiment, the description thereof is omitted.

[0080] As described above, according to this modified example, by opening the through-hole 13 that reaches the variable layer 11 in a part of the insulating resin layer P2 (continuously or intermittently along the circumferential direction), a part of the variable layer 11 can be exposed to the outside through this through-hole 13. In this state, external load acting portions 11p similar to those in the above-described first embodiment are formed in a part of the variable layer 11. As a result, the above-described external load (thermal, electrical, mechanical, chemical stimuli) can be applied to the external load acting portion 11p. Note that since other effects are the same as those in the above-described first embodiment, the description thereof is omitted.

[0081] "Fourth Modified Example" FIG. 6 is an external configuration diagram of the mold vacuum valve P according to this modification. In the above-described second embodiment, the dividing portion 12 along the direction parallel to the virtual axis Px was assumed. Instead, in this modification, the dividing portion 12 along the direction intersecting the virtual axis Px is assumed.

[0082] As shown in FIG. 6, similar to the above-described second embodiment, the dividing portion 12 of this modification has a plurality of dividing portions 12 formed by cutting out at least a part of the insulating resin layer P2. These dividing portions 12 have a rotationally symmetric positional relationship about the virtual axis Px. Since the other configurations and effects are the same as those of the above-described second embodiment, the description thereof is omitted.

[0083] As described above, some embodiments and modifications of the present invention have been described. However, these embodiments and modifications are presented as examples and are not intended to limit the scope of the invention. These embodiments and modifications can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications are included in the scope and gist of the invention and are included in the invention described in the claims and the equivalent scope thereof.

Explanation of Reference Numerals

[0084] P... Mold vacuum valve, P1... Vacuum valve, P2... Insulating resin layer, E1... Fixed electrode, E2... Movable electrode, 1... Insulating container, 1a... Fixed-side insulating barrier tube, 1b... Movable-side insulating barrier tube, 2... Fixed-side sealing member, 3... Movable-side sealing member, 4... Airtight maintenance mechanism, 5... Arc shield, 5f... Flange portion, 6... Fixed contact, 7... Fixed current-carrying axis, 8... Movable contact, 9... Movable current-carrying axis, 10... Ground layer, 11... Variable layer, 11p... External load acting portion (portion exposed to the outside, exposed surface), 11s... Central portion (a part), 11t... Division starting point portion, 12... Division portion, 13... Through hole, K1... Fixed-side opening, K2... Movable-side opening, Px... Virtual axis.

Claims

1. A vacuum valve that accommodates a pair of electrodes so as to be openable and closable, An insulating resin layer molded so as to cover the vacuum valve, A variable layer provided together with the insulating resin layer so as to cover at least a part of the entire outside of the vacuum valve and deformable by applying an external load, The variable layer is maintained in an integrated state with the insulating resin layer before the external load is applied, and after the external load is applied, it deforms into a state different from that of the insulating resin layer, separating the insulating resin layer from the vacuum valve. A molded vacuum valve that can be separated.

2. The molded vacuum valve according to claim 1, wherein a part of the variable layer is provided so as to be exposed to the outside.

3. The molded vacuum valve according to claim 2, wherein a portion of the variable layer exposed to the outside is configured as an external load acting portion for applying an external load.

4. The insulating resin layer has a plurality of divided portions formed by cutting out at least a part of the insulating resin layer so that the insulating resin layer can be divided into a plurality of parts, Each of the insulating resin layers divided by the divided portions is molded together with the variable layer so as to cover the vacuum valve, according to claim 1. Molded vacuum valve.

5. The molded vacuum valve according to claim 4, wherein a plurality of the divided portions are provided along a direction parallel to an imaginary axis defining the center of the vacuum valve or a direction intersecting the imaginary axis.

6. The molded vacuum valve according to claim 1, wherein the variable layer is provided between the vacuum valve and the insulating resin layer or inside the insulating resin layer.

7. The molded vacuum valve according to claim 1, wherein a part of the variable layer is thicker than other parts and has a separation starting portion that can be a starting point when separating the insulating resin layer from the vacuum valve.

8. The molded vacuum valve according to claim 7, wherein the separation starting portion has a contour shape protruding toward the insulating resin layer more than the other portions in the part of the variable layer.

9. In the variable layer in which the external load acting portion is configured as a portion for applying a thermal stimulus, The linear expansion coefficient of the variable layer is set to be larger than the linear expansion coefficient of the insulating resin layer, according to claim 3. Molded vacuum valve.

10. When the insulating resin layer is made of a thermosetting resin, The variable layer is composed of a thermoplastic resin. The molded vacuum valve according to claim 9.

11. In the variable layer where the external load acting part is configured as a part for applying an electrical stimulus, The conductivity of the variable layer is set to be higher than the conductivity of the insulating resin layer. The molded vacuum valve according to claim 3.

12. In the variable layer where the external load acting part is configured as a part for applying a mechanical stimulus, The impact resistance of the variable layer is set to be lower than the impact resistance of the insulating resin layer. The molded vacuum valve according to claim 3.

13. In the variable layer where the external load acting part is configured as a part for applying a chemical stimulus, The chemical resistance of the variable layer is set to be lower than the chemical resistance of the insulating resin layer. The molded vacuum valve according to claim 3.

14. The external load acting part is configured as a chemical agent injection part for injecting a chemical agent to cause transformation, In the variable layer, the chemical agent injection part is configured in a manner different from other locations. The molded vacuum valve according to claim 13.

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