JP2024176486A - Electric power distribution device and method for manufacturing the same - Google Patents

Abstract

[Problem] To improve adhesion between a vacuum valve and molded resin in a power distribution device 1, to relieve stress on the resin to ensure strength and improve voltage resistance. [Solution] A vacuum valve 30 is provided having a fixed electrode 11, a movable electrode 21, and a housing container that houses the contact parts of these contacts 12, 22, and a phenoxy resin layer containing mica fluoride and fumed silica is interposed as an adhesive medium between the resin 2 and the outer surface (part) of the housing container of the valve member 30 made of ceramic and metal (part shown by dotted line 48). [Selected Figure] Figure 2

Description

The present invention relates to power distribution equipment, particularly equipment having a resin-molded vacuum interrupter, and a method for manufacturing the same.

In power distribution equipment, especially molded vacuum circuit breakers, it is necessary to mold the entire valve section made of ceramics and other materials in resin in addition to the many metal parts. In many cases, there is a difference in the linear expansion coefficient between the resin and the molded parts, and in vacuum circuit breakers, there is a difference in the linear expansion coefficient between the ceramic and metal that form the outer edge of the circuit breaker valve and the resin. Generally, ceramics and metals often have a lower linear expansion coefficient than the resin used for molding, and the difference in linear expansion coefficient has been the cause of resin cracking. In recent years, measures have been taken to prevent resin cracking by increasing the linear expansion coefficient of the resin or improving the strength and fracture toughness of the resin. In addition, stress may be relieved by sandwiching silicone rubber between the resin used for molding and the circuit breaker valve. This is because it is not easy to change the resin properties, and such resins are usually expensive. In addition, when sandwiching silicone rubber, it is necessary to take measures such as painting or wrapping expensive silicone around the valve, which is time-consuming, and this type of processing requires high manufacturing costs in addition to the cost of materials, as well as manual and mechanical processing.

Patent Document 1 discloses a molded device equipped with components such as metal electrodes and alumina vacuum valves, with a mica layer and a molded layer provided on the surface of the built-in components. It is shown that the mica layer contains a binder and mica, and that phenoxy resin is preferred as the binder. Patent Document 2 discloses a resin composition for fiber-reinforced composite materials that contains fluorinated mica and phenoxy resin, and further indicates that finely powdered silica can be included as a filler.

JP 2020-145328 A JP 2001-106800 A

Patent Document 1 is intended for circuit breakers and uses mica as a binder, but there is no mention or suggestion of fluorinating the mica. There is also no mention of using fumed silica as mentioned in this specification. Patent Document 2 does not mention a specific use of a phenoxy resin composition containing fluorinated mica, namely use in molded power receiving and distribution equipment. Furthermore, there is no mention of the primary particle size of the finely powdered silica, nor is there any mention of whether or not it is fumed silica.

In power distribution equipment, particularly in the circuit breaker valves of vacuum circuit breakers, it is important to provide an adhesive layer between the metal parts and the molding resin to improve adhesion, reduce the stress acting on both sides of the adhesive layer, and improve voltage resistance. It is also important to make it easy to adjust the viscosity when spray painting in order to improve productivity.

In order to solve the above problems, an object of the present invention is to provide an electric power distribution device in which an adhesive medium is interposed between a molded component having a ceramic or metal surface and a molding resin, which absorbs the difference in linear expansion coefficients and makes it possible to suppress cracks.
Another object of the present invention is to provide an electric power receiving and distributing device in which a phenoxy resin layer containing mica fluoride and fumed silica is used as an adhesive medium and the adhesive medium is applied to the surface portion of the resin in contact with the air near the movable electrode.

Representative features of the invention disclosed in this application are as follows.
According to one feature of the present invention, a power receiving and distributing device is provided in which a molded member having a ceramic or metal surface is covered with a molding resin, and a phenoxy resin layer containing mica fluoride and fumed silica is interposed as an adhesive medium between the outer surface of the molded member and the resin. The adhesive medium may further contain an epoxy resin or may be mixed with rubber-based fine particles. The rubber-based fine particles are preferably core-shell type rubber fine particles. The surface of the fumed silica contained in the adhesive medium may be modified with an alkyl group.

According to another feature of the present invention, the action point side of the movable part of the movable electrode is placed in a space covered with a molding resin, this space is in an environment exposed to the atmosphere, and has an inner circumferential surface formed so as to be separated from the movable electrode by a predetermined distance in a direction perpendicular to the moving direction of the movable electrode. In the present invention, a phenoxy resin layer containing mica fluoride and fumed silica is applied as a coating material to the side of this inner circumferential surface closer to the valve member.

According to yet another feature of the present invention, in an electric power distribution device in which the inside of a vacuum-filled electric power distribution section is molded with resin, a layer of phenoxy resin containing mica fluoride and fumed silica is applied as an adhesive medium between the outer surface of the valve member and the resin, and the valve member to which the resin has been applied, the connection terminal to the fixed electrode, and the connection terminal to the movable electrode are all molded with the resin to manufacture the electric power distribution device.

The present invention makes it possible to improve the voltage resistance of the power receiving and distribution equipment and prevent mold cracking caused by peeling of the resin near the outer surface of the container for the valve section. In addition, because the risk of mold cracking is reduced, it is possible to make the power receiving and distribution equipment more compact by making the mold thinner and to improve the pressure resistance. Furthermore, because the viscosity can be freely controlled according to the thickness of the coating of the adhesive medium, it is possible to manufacture molded power receiving and distribution equipment that is highly reliable and durable.

1A is a vertical cross-sectional view of a vacuum circuit breaker 1 according to an embodiment of the present invention, and FIG. 1B is a vertical cross-sectional view of a vacuum interrupter 30 before being molded. 1A is a vertical cross-sectional view similar to that of FIG. 1A, showing the area to which the adhesive medium 40 of this embodiment is applied. 4 is a table of ingredients of an adhesive medium 40 used in the vacuum circuit breaker 1. 1 is a table showing components of adhesive media usable in the vacuum circuit breaker 1, their characteristics and amounts. 11 is a table showing ingredients of an adhesive medium 60 according to a second embodiment of the present invention. FIG. 11 is a diagram showing the internal structure of an adhesive medium according to a third embodiment of the present invention. 1 is the chemical formula of a typical fumed silica surface. FIG. 8 shows the chemical formula of the fumed silica surface in which OH has been modified with alkoxy groups.

The following describes an embodiment of the present invention with reference to the drawings. Note that in the following drawings, the same parts are given the same reference numerals and repeated explanations are omitted.

Figure 1 is a vertical cross-sectional view showing the structure of a vacuum circuit breaker 1 to which the present invention is applied. Figure 1 (A) is a cross-sectional view of the whole, and (B) is a cross-sectional view showing the structure of the vacuum valve 30 portion. The vacuum circuit breaker 1 is a type of circuit breaker that is widely used in high-voltage and extra-high-voltage distribution facilities, and is also called a molded vacuum circuit breaker. The vacuum circuit breaker 1 is configured to include a fixed electrode 11 and a movable electrode 21, and the movable electrode 21 is arranged coaxially with the central axis A1 so as to face the fixed electrode 11 in the container 31. When the contact 22 at the tip of the movable electrode 21 separates from the contact 12 at the tip of the fixed electrode 11, the electric path from the fixed conductor 10 to the movable conductor 20 is interrupted. Figure 1 shows a state in which the electric path is interrupted. Also, when the contact 12 and the contact 22 come into contact with each other, an electric path from the fixed conductor 10 to the movable conductor 20 is established. A portion of the fixed electrode 11 is inserted into the container 31, one end of the fixed electrode 11 is connected to an external main circuit (not shown), and the other end is connected to the fixed conductor 10 inside the resin 2.

One end of the fixed electrode 11 is fixed to the fixed conductor 10 made of metal, and a contact 12 is formed at the other end. The other end where the contact 12 is formed is located in the space 39 inside the container 31. The fixed conductor 10 and the fixed electrode 11 are electrically connected. The movable electrode 21 is connected in a sliding state to a cup-shaped sliding member 24 with a through hole. The sliding member 24 is fixed to the movable conductor 20, so that the movable electrode 21 and the movable conductor 20 are electrically connected. Note that the movable electrode 21 and the sliding member 24 are shown to be separated near the arrow 28 in FIG. 1(A), but this is for convenience of explanation, as a gap is shown to show the sliding state. In reality, they are in contact with each other, and the movable conductor 20 can move, so that an electrical conduction state is maintained. In addition, the sliding member 24 and the movable conductor 20 do not have to be separate, but may be manufactured as a metal integrated product.

A portion of the movable electrode 21 is located within the space 39, and an opposite portion is located outside the space 39 (atmospheric pressure portion), with the opposite end connected to the movable insulating rod 27. The movable insulating rod 27 is connected to a drive means or operating means (not shown) and configured to be movable in the direction of the arrow 29. In this way, the vacuum circuit breaker 1 connects or disconnects the power transmission circuit from the fixed conductor 10 to the movable conductor 20.

Figure 1 (B) is a vertical cross-sectional view of the vacuum valve 30, including the container 31 that contains the contact portion (contacts 12, 22) of the movable electrode 21 of the fixed electrode 11. In order to reduce contact resistance, the contacts 12 and 13 are formed in a shape that increases the width in the vertical and horizontal directions so that the area of the abutting portion is increased. In addition, in Figure 1 (B), the space 39 containing the contacts 12 and 22, i.e., the internal space of the container 31, is in a vacuum state. The container 31 is also called a vacuum container, and is highly airtight.

The container 31 is formed of a cylindrical member 32 made of alumina ceramic, and sealing metal fittings 33, 34 made of aluminum alloy, which are connected to the front and rear of the cylindrical member 32. In this invention, the "valve member" refers to the part contained in the container. When the movable electrode 21 is opened relative to the fixed electrode 11, an arc is generated between the contacts 12, 22 and the arc tends to continue, but by making the space 39 inside the container 31 a vacuum, the arc can be extinguished. Through holes 33a and 34a are formed in the vacuum container 31. The fixed electrode 11 contacts the through hole 33a in a non-slidable state, and the movable electrode 21 contacts the through hole 34a in a slidable state. A bellows 36 is provided in the inner space of the sealing metal fitting 34 on the movable electrode 21 side.

The bellows 36 is installed in the container 31, and prevents air from entering the space 39 through the through hole 34a, which is the sliding surface between the movable electrode 21 and the sealing metal fitting 34, in order to maintain the vacuum in the container 31 even when the movable electrode 21 moves. A bellows arc shield 37 is provided at the tip of the bellows 36, close to the contact 22. A substantially cylindrical ceramic arc shield 35 (see FIG. 1A) is provided inside the cylindrical member 32. The disconnection operation is performed by moving the movable insulating rod 27 (see FIG. 1A) connected to the movable electrode 21 along the axis A1 in the direction of the arrow 29a, and the contact 22 of the movable electrode 21 is released from contact with the contact 12 of the fixed electrode 11 by moving the movable insulating rod 27 in the opposite direction to the arrow 29a.

The outer surface of the vacuum vessel 31 shown in FIG. 1(B) is entirely molded with epoxy resin 2 as shown in FIG. 1(A). Resin 2 is molded to include not only the outside of the vacuum vessel 31 but also the fixed conductor 10, fixed electrode 11, cylindrical sliding member 24, and movable conductor 20, and the resin molded portion determines the outer shape of the power receiving and distributing device. In this embodiment, a distinctive adhesive medium 40 (see FIG. 3 for the symbol described below) is used in the manufacturing stage where this resin mold is formed.

The adhesive medium 40 is applied without omission to the outer surface of the vacuum vessel 31, i.e., the outer surface of the cylindrical member 32 and the outer surfaces of the sealing metal fittings 33, 34, and the vacuum valve 30 with the adhesive medium 40 applied is molded in the resin 2. In other words, this adhesive medium 40 (the reference number is not shown in FIG. 1) functions as an adhesive between the outer surfaces of the cylindrical member 32 and the sealing metal fittings 33, 34 and the resin 2.

A number of reinforcing metal members 5a, 5b, 6a, 6b, and 7 are cast into the resin 2. The metal member 5a is cylindrical and is cast into the resin 2 in contact with the corner 33b of the sealing metal fitting 33. The metal member 5b is cylindrical and is cast into the resin 2 in contact with the corner 34b of the sealing metal fitting 34. The metal member 6a is a ring-shaped member and is cast into the resin 2 in contact with the fixed-side conductor 10. The metal member 6b is a ring-shaped member and is cast into the resin 2 in contact with the sliding member.

Figure 2 is a cross-sectional view of the same vacuum interrupter 1 as in Figure 1, with the dotted line 48 indicating the area to be coated with adhesive medium 40 (see Figure 3 for the reference numerals described later). The area indicated by dotted line 48 indicates the area in the cross-sectional view in two dimensions. After applying adhesive medium 40 to the entire outer surface of the container 31 (see Figure 1 (B)), the container 31 is cast in resin to form a molded body of resin 2 on the outside. The stress relief provided by the adhesive layer of adhesive medium 40 can absorb the difference in linear expansion coefficient between the two components that would normally be in contact, i.e., between cylindrical member 32 and resin 2, and between sealing metal fittings 33, 34 and resin 2, thereby eliminating the risk of cracks occurring in resin 2.

In this embodiment, a layer of phenoxy resin containing mica fluoride and fumed silica is placed between a member having a ceramic or metal surface (vacuum container 31 shown in FIG. 1B) and resin 2 for molding as an adhesive medium 40 (see FIG. 3). This allows the adhesive layer to absorb the difference in linear expansion coefficients and suppress cracks. Conventionally, flat particles such as mica, which have been known as adhesive media, are known to improve voltage resistance performance. However, mica has poor dispersibility in phenoxy resin, and there is a problem of suspension, sedimentation, and aggregation. Such uneven dispersion causes bias in the mica contained in the coating film when the coating film is formed, causing variation in the mica concentration depending on the location where it is applied, which causes a decrease in voltage resistance performance. In this embodiment, phenoxy resin containing mica fluoride is used as the adhesive medium 40, so the deterioration of particle dispersibility in phenoxy resin can be eliminated.

The ingredients list of the adhesive medium 40 is shown in Figure 3. As can be seen from Figure 3, this paint is made mainly of phenoxy resin. 15 wt% mica fluoride is added to this, and it is further diluted with petroleum-based thinner. 3.0 wt% fumed silica is added to adjust the liquid viscosity. The fumed silica used has a primary particle size of 20 nm. Furthermore, the surface OH groups generated on the fumed silica are not modified in any way.

Unlike mica, mica fluoride is soluble or disperses well in phenoxy resin and thinners that dissolve it, making it possible to apply uniform coating when spraying. Uneven coating creates unevenness on the coating surface, which becomes a weak point and reduces the voltage resistance, but the adhesive medium 40 of this embodiment has good dispersion and can prevent this. Furthermore, a small amount of fumed silica is added to the adhesive medium of this embodiment. By adding fumed silica, the viscosity of the adhesive medium 40 can be effectively adjusted, making it easy to adjust the viscosity to match the high and low spray discharge pressure during application work. The amount of fumed silica added is usually between 0.1 wt% and 5 wt%, which makes it easy to respond to many changes in spray coating thickness when spraying the outer surface of the storage container 31, etc.

The table in Figure 4 summarizes the components and characteristics of epoxy board 52 made using a conventional adhesive medium (coating liquid) and epoxy boards 53 and 54 made using adhesive medium 40 according to this embodiment. In this table, the first example 51 is an example in which an epoxy board as an adhesive medium is not used, that is, a case in which resin 2 is molded directly on the outside of the structure forming the vacuum space shown in Figure 2 (B).

Paints that contain epoxy resins as adhesive media are known. This adhesive media (coating liquid) is 52. Epoxy resins and phenoxy resins have similar reaction forms, but epoxy resins become thermosetting resins due to crosslinking reactions. After the phenoxy resin hardens, it can be used to adjust the hardness of the flexible layer derived from the phenoxy. It is suitable when robustness of the coating film is required.

Epoxy resin 52 uses bisphenol A type epoxy resin as the mixed epoxy resin, and adds almost the same amount of amine-based hardener and a very small amount of imidazole. When applying adhesive medium (coating liquid) 52-54, it is set to 45 μm after drying. The amount of fumed silica added to adhesive medium 40 is preferably between 1 wt% and 3 wt%, and adding fumed silica makes it easier to respond to changes in the thickness of many spray coatings. Epoxy board using this adhesive medium 40 is 54. The adhesive medium 40 in this embodiment is a coating liquid of mica fluoride + phenoxy resin + fumed silica, and when the pressure resistance performance of epoxy resin board 54 coated with this adhesive medium 40 was examined, it was found to be 39.5 kV/mm, which is significantly higher than the value of 28 kV/mm of epoxy resin 51 without a phenoxy resin layer.

In addition, when heat shock tests were conducted from -50°C to +110°C to examine the crack resistance, as shown in epoxy boards 52 to 54, by applying at least phenoxy resin, no cracks occurred, and this property did not change even when mica fluoride or fumed silica was added. As described above, in this embodiment, the liquid properties of the adhesive medium 40 as a coating can be adjusted to a uniform viscosity suitable for spraying, making it possible to improve pressure resistance and crack resistance.

Figure 5 is a table showing the components of the adhesive medium 60 according to the second embodiment, their characteristics, and their contents. Here, the adhesive medium 60 forming the vacuum space is an example in which the main component, phenoxy resin 61 (40 wt%), is mixed with 5 wt% of epoxy resin 65. It also contains 15 wt% of fluorinated mica 62 and 3 wt% of fumed silica. Fumed silica has a very fine primary particle diameter of several tens of nanometers, and polar molecular chains such as Si-O-Si and Si-OH are exposed on the surface. For this reason, it has good compatibility with phenoxy resin and a gentle effect of increasing viscosity. On the other hand, by making it hydrophobic by alkylating some of the Si-OH groups, the compatibility decreases, but since it is fine and the amount added is small, it does not cause aggregation or precipitation, and exhibits the characteristic of rapidly increasing the viscosity in relation to the added concentration. In particular, when a thick coating is desired, a higher viscosity liquid is less likely to drip, and when the discharge pressure during spray application is high, the higher the viscosity, the more uniform the coating film can be formed. Preferably, the surface of the fumed silica 64 contained in the adhesive medium 60 described above is modified with an alkyl group.

The petroleum-based thinner 63 is a thinner that further contains 3 wt% amine hardener. By using such an adhesive medium 60, it is possible to obtain an internal structure in which island-shaped epoxy resin cured products 65 are scattered in the phenoxy resin 61 after drying, as shown in FIG. 6. By creating such an internal structure of the resin, island-shaped epoxy resin 65 cured products are scattered in the phenoxy resin 61 after drying, which is called a sea-island structure, and the adhesive medium 60 has the effect of improving the toughness of the coating film.

As described above, the adhesive medium 60 is applied between the metal components of the vacuum valve 30 and the outer resin. The high electric field areas in the vacuum circuit breaker 1 are mainly the peripheral areas of the vacuum valve 30, particularly the areas near both ends of the valve and the metal surfaces around them. By painting these areas, the effect of high voltage resistance is more pronounced. In addition, the occurrence of cracks can be suppressed by reducing tension between two materials with different linear expansion coefficients.

Next, a third embodiment of the present invention will be described. In the third embodiment, an example will be described in which the above-mentioned adhesive medium (adhesive medium 60) contains rubber-based fine particles (not shown). The adhesive medium 60 of this embodiment may contain rubber-based fine particles. The rubber-based particles have the effect of imparting flexibility to the adhesive layer made of phenoxy resin, and when applied in cases where further stress relaxation is required, for example when there is a large difference in the linear expansion coefficient between the resin and the ceramic or metal parts, peeling is less likely to occur, adhesion is improved, and cracks do not occur.

The rubber particles may be core-shell type rubber particles. In this embodiment, the rubber particles are of the core-shell type consisting of two or more layers. The rubber particle diameter is preferably 1 μm or less and 100 nm or more. For example, the rubber particles may be made into two layers, and the outer layer may be a highly polar rubber layer such as nitrile butadiene rubber, which is rubber particles containing carboxyl groups or hydroxyl groups that are highly compatible with phenoxy resin, and the surface may have acrylic groups. The inner layer may be made of styrene butadiene rubber, which has a rubber-like elasticity. These rubber particles disperse well in the phenoxy resin, allowing for uniform application and preventing aggregation or precipitation in the liquid.

In an example using rubber particles with an average particle size of 700 nm, the phenoxy resin 41 of the components shown in Figure 3 was reduced by 5 wt%, and this 5 wt% was replaced with rubber particles. A heat shock test was conducted using this adhesive medium 40A, and no cracks were generated even in tests at -70°C to 110°C. A fracture toughness test confirmed that the fracture toughness was 1.7 times higher than that of the adhesive medium 40 shown in Figure 3. As described above, Example 3 was able to further strengthen the resin 2.

Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, the surface of the fumed silica contained in the adhesive medium is modified with an alkyl group. Figure 7 shows the chemical formula of a normal fumed silica surface, with silicon atoms and oxygen atoms on the surface, and hydroxyl groups bonded to some of the silicon atoms. This state certainly has the effect of increasing the thixotropy of the medium (the initial viscosity from when the viscous liquid is stationary until it starts to move), but to further improve the thixotropy with the addition of a small amount, it is effective to modify the OH with alkoxy groups such as ethoxy and butoxy.

Figure 8 shows the chemical formula of the adhesive medium in which the OH groups shown in Figure 7 have been alkoxylated. This type of fumed silica is also widely available on the market and can be used at low cost. In this example, the same viscosity control effect was obtained by adding 0.1 to 1 wt % to the paint. As described above, this example makes it possible to control the viscosity of the paint by adding a very small amount of fumed silica.

Next, a fifth embodiment of the present invention will be described. In the fifth embodiment, the adhesive medium 40 or 60 is used not as an adhesive but as a surface protective agent (paint). The target power distribution device such as a molded vacuum circuit breaker 1 is the same as in the first to fourth embodiments.

The action point side of the movable part of the movable electrode 21 (the connection point side with the movable insulating rod 27) is placed in a space covered with the resin 2 for molding, and the cylindrical space has wall surfaces (inner circumferential surfaces) 4a to 4c formed to be separated from the movable electrode 21 by a predetermined distance in a direction perpendicular to the moving direction of the movable electrode 21. In this way, a cylindrical covering portion is formed with the resin 2, and either the adhesive medium 40 or 60 is applied to a part of the inner circumferential surface of the covering portion that overlaps with the moving range of the movable electrode 21 and is closer to the fixed electrode 11, that is, the part shown by the dashed line 90 in FIG. 2. This application area 91 is, as viewed in the axial direction A1 of the cylindrical movable electrode 21, a part of the inner diameter of the thick diameter portion 4c and the tapered portion 4b from the thin diameter portion 4a to the thick diameter portion 4b of the cylindrical portion that forms the non-vacuum space 4 of the resin 2, and is the wall surface of the part where the electric field is particularly high. This coating area 91 corresponds to the interface between the epoxy resin 2 and the air, and is located outside the vacuum space 3 in which the vacuum valve 30 is located in the direction of the axis A1 (on the side of the movable insulating rod 27), corresponding to the portion where the movable insulating rod 27 is located.

In this way, in the fifth embodiment, the adhesive medium 40 or 60 is not only used as an adhesive, but is also used as a paint for surface coating of areas where the electric field strength is particularly high. The fifth embodiment may be used in combination with the first to fourth embodiments, or may be used alone. By actively applying the adhesive medium 40 or 60 of the present invention to areas where the electric field strength is high, it is possible to prevent discharge or breakdown due to discharge. In addition, since the breakdown phenomenon can be suppressed by a thinner resin thickness at the same voltage, it is possible to make the main body smaller and lighter. In addition, the adhesive medium 40 or 60 is not applied to the inside of the narrow diameter portion 4a of the cylindrical portion forming the non-vacuum space 4 of the resin 2, but it is possible to form it so that it is applied. Furthermore, the adhesive medium 40 or 60 may also be applied to the inner circumferential surface of the cylindrical portion forming the non-vacuum space 4 on the side away from the vacuum valve 30 as viewed from the application area 91 in FIG. 2.

Although the present invention has been described above based on the first to fifth embodiments, the present invention is not limited to the above-mentioned embodiments, and various modifications are possible within the scope of the invention. The content of mica fluoride and fumed silica contained in the phenoxy resin layer may be increased or decreased as appropriate from the above-mentioned examples.

Reference Signs List 1 Vacuum circuit breaker 2 Resin 3 Vacuum space 4 Non-vacuum space 5a, 5b, 6a, 6b Metal member 7 Metal member 10 Fixed side conductor 11 Fixed electrode 12 Contact 20 Movable side conductor 21 Movable electrode 22 Contact 24 Sliding member 27 Movable side insulating rod 30 Vacuum valve 31 Storage container (vacuum container)
32 Cylindrical member 33 Sealing metal fitting 33a Through hole 33b Corner 34 Sealing metal fitting 34a Through hole 34b Corner 35 (for cylindrical member) Arc shield 36 Bellows 37 (for bellows) Arc shield 39 Space 40, 40A Adhesive medium 50 Adhesive medium (coating liquid)
51: Phenoxy resin 52: Epoxy resin plate 53: Epoxy resin 60: Adhesive medium 61: Phenoxy resin 62: Epoxy resin cured product 90: Paint applied portion (dashed line)
91 Coating area

Claims (15)

A power receiving and distributing device comprising a valve member having a container for accommodating a contact portion between the fixed electrode and the movable electrode, the inside of which is evacuated, the valve member being made of ceramic and/or metal and having an exterior molded with resin, the device comprising:
A power receiving and distributing device, characterized in that a layer of a phenoxy resin containing mica fluoride and fumed silica is interposed as an adhesive medium between the outer surface of the storage container and the resin. The power receiving and distributing device according to claim 1, characterized in that the adhesive medium contains an epoxy resin. The power receiving and distributing device according to claim 1, characterized in that rubber-based particles are mixed into the adhesive medium. The power receiving and distributing device according to claim 3, characterized in that the rubber-based microparticles are core-shell type rubber microparticles. The power receiving and distributing device according to any one of claims 1 to 4, characterized in that the surface of the fumed silica contained in the adhesive medium is modified with an alkyl group. the action point side of the movable part of the movable electrode is disposed in the space covered with the resin,
the space is formed by the resin cylindrical cover portion having an inner circumferential surface formed so as to be spaced a predetermined distance from the movable electrode in a direction perpendicular to a moving direction of the movable electrode,
The power receiving and distributing device according to claim 1 , wherein the adhesive medium is applied to the inner circumferential surface of the cover portion that overlaps with a range of movement of the movable electrode. A fixed electrode made of metal, a movable electrode made of metal,
A method for manufacturing an electric power receiving and distributing device, comprising: a ceramic and/or metallic container covering a contact portion between the fixed electrode and the movable electrode; and a valve member having an inside evacuated, molded with resin, the method comprising the steps of:
Applying a layer of phenoxy resin containing mica fluoride and fumed silica as an adhesive medium between the outer surface of the valve member and the resin;
A method for manufacturing an electric power receiving and distributing device, comprising molding, with resin, a valve member coated with resin, a connection terminal to said fixed electrode, and a connection terminal to said movable electrode. The method for manufacturing a power distribution device according to claim 7, characterized in that the adhesive medium is mainly composed of phenoxy resin and contains mica fluoride and fumed silica. The method for manufacturing a power distribution device according to claim 8, characterized in that the adhesive medium further contains an epoxy resin. The method for manufacturing a power distribution device according to claim 8, characterized in that rubber-based fine particles are mixed into the adhesive medium. The method for manufacturing an electric power distribution device according to claim 10, characterized in that the rubber-based microparticles are core-shell type rubber microparticles. The method for manufacturing an electric power receiving and distributing device according to any one of claims 7 to 11, characterized in that the surface of the fumed silica contained in the adhesive medium is modified with an alkyl group. In the molding step, a cylindrical cover portion is formed around the movable portion of the movable electrode and is molded with the resin so as to be spaced apart from the movable electrode;
The method for manufacturing an electric power receiving and distributing device according to claim 7 , further comprising applying the adhesive medium to an inner peripheral surface of the formed cover portion within a range of movement of the movable electrode. A power receiving and distributing device comprising a valve member having a container for accommodating a contact portion between the fixed electrode and the movable electrode, the inside of which is evacuated, the valve member being made of ceramic and/or metal and having an exterior molded with resin, the device comprising:
a resin portion in the vicinity of a movable portion of the movable electrode has a cylindrical cover portion having an inner peripheral surface spaced apart from the movable electrode;
13. An electric power receiving and distributing device, comprising: a phenoxy resin layer containing mica fluoride and fumed silica formed on the inner circumferential surface of the cover portion within a range of movement of the movable electrode. The power receiving and distributing device according to claim 14, characterized in that the phenoxy resin layer further contains an epoxy-based resin.

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