阅读说明：本技术 消弧用绝缘材料成型体及断路器 (Arc-extinguishing insulating material molded body and circuit breaker ) 是由 细越文彦 桧座秀一 渡边真也 石仓智史 川名隆志 于 2018-12-03 设计创作，主要内容包括：本发明涉及消弧用绝缘材料成型体及断路器。所述消弧用绝缘材料成型体为包含每单位体积所含的氧原子量为1.75×10<Sup>-2</Sup>[mol/cm<Sup>3</Sup>]以上的热固化性树脂固化体的消弧用绝缘材料成型体。热固化性树脂固化体优选为包含以下的环氧树脂组合物的固化体：每1分子所含的氧原子数的比例为全部构成原子数的9.0％以上的环氧树脂和每1分子所含的氧原子数的比例为全部构成原子数的12.5％以上的酸酐。(The invention relates to an arc-extinguishing insulating material molded body and a circuit breaker, wherein the arc-extinguishing insulating material molded body contains oxygen atoms with a content of 1.75 × 10 per unit volume ‑2 [mol/cm 3 ]An arc-extinguishing insulating material molded body of the above-described thermosetting resin cured body. The thermosetting resin cured product is preferably a cured product of an epoxy resin composition containing: a ring having a ratio of the number of oxygen atoms contained in 1 molecule of the ring being 9.0% or more of the total number of constituent atomsAn oxygen resin and an acid anhydride in which the proportion of the number of oxygen atoms contained in 1 molecule is 12.5% or more of the total number of constituent atoms.)

1. An arc-extinguishing insulating material molded body characterized in that it comprises an oxygen atom content per unit volume of 1.75 × 10^-2[mol/cm³]The above thermosetting resin cured product is formed.

2. An arc-extinguishing insulating material molded body according to claim 1, wherein the thermosetting resin cured body is a cured body of an epoxy resin composition containing: an epoxy compound having an oxygen atom number ratio of 9.0% or more of the total constituent atoms per 1 molecule, and an acid anhydride having an oxygen atom number ratio of 12.5% or more of the total constituent atoms per 1 molecule.

3. An arc-extinguishing insulating material molded body according to claim 2, wherein the epoxy compound is an alicyclic epoxy compound.

4. An arc-extinguishing insulating material molded body according to claim 1, wherein the thermosetting resin cured body is a cured body of an unsaturated polyester resin composition.

5. An arc-extinguishing insulating material molded body according to claim 4, wherein the unsaturated polyester resin composition is obtained by: an unsaturated polyester resin obtained by reacting an unsaturated polybasic acid or an anhydride thereof selected from the group consisting of maleic anhydride, maleic acid and fumaric acid, a saturated polybasic acid or an anhydride thereof selected from the group consisting of isophthalic acid, phthalic anhydride, terephthalic acid, succinic acid and adipic acid, and a polyhydric alcohol selected from the group consisting of propylene glycol, ethylene glycol, butylene glycol, diethylene glycol and dipropylene glycol, is dissolved in a radical polymerizable monomer.

6. A circuit breaker is provided with: a fixed contact having a fixed contact point; a movable contact having a movable contact point; an opening/closing mechanism section for operating the movable contact; and an arc-extinguishing insulating material molded body, the arc-extinguishing insulating material molded body being disposed in: a position exposed to an arc generated when the fixed contact and the movable contact are separated,

the arc extinguishing insulating material molded body according to any one of claims 1 to 5.

Technical Field

The present invention relates to an arc-extinguishing insulating material molded body and a circuit breaker including the same.

Background

A circuit breaker is a device used to prevent damage to a secondary-side circuit (a load circuit, an electric wire, or the like) by opening the circuit and interrupting power supply from the primary side when an abnormal current flows in the secondary-side circuit due to overload, short-circuit, or the like. Such a circuit breaker is used in, for example, a general household, a factory, an office, and the like.

Generally, a circuit breaker includes an arc extinguishing chamber, a movable contact, and a fixed contact. The contacts each have a contact point and are accommodated in the arc extinguishing chamber. When the power is applied, the movable contact comes into contact with the fixed contact. In such a circuit breaker, when an excessive current or a rated current is applied, a contact point of the movable contact and a contact point of the fixed contact are separated, thereby forcibly interrupting the current. At this time, an arc is generated (ignited (japanese) between the movable contact and the fixed contact). This is due to: even if the movable contact is separated from the fixed contact, the current continues to flow.

The arc is a thermal load and an electromagnetic force load on the components of the circuit breaker, and therefore, it is necessary to rapidly extinguish the arc. Therefore, in order to promote the extinction of an arc generated during interruption in a circuit breaker, an arc extinction device including an arc extinction insulating material molded body (hereinafter, sometimes abbreviated as a molded body) that contributes to extinction of the arc is disposed around an arc generation portion. The arc extinguishing insulating material molded body is formed by decomposing the material itself constituting the molded body to generate gas if exposed to an arc, and contributes to rapid arc extinction by cooling of the arc by the generated gas, spreading of the arc by the ejection of the generated gas, and the like.

For example, patent document 1 discloses the use of a thermosetting resin such as an epoxy resin or an unsaturated polyester resin as a matrix resin for an insulating material of an arc extinguishing device. Generally, thermosetting resins can realize arc extinguishing devices having excellent heat resistance, heat distortion resistance, mechanical strength, and the like, as compared with thermoplastic resins.

Patent document 2 discloses an arc extinguishing resin processed product in which microcapsules are added to an epoxy resin as a matrix resin, the microcapsules containing a core material containing water by a coating film made of a composition containing 0.1 to 30 mass% of an epoxy polymer in a polystyrene polymer.

Disclosure of Invention

Problems to be solved by the invention

When the arc is interrupted, there is a problem that the insulating property of the surface of the molded article is lowered due to adhesion of conductive scattering substances such as metal particles generated by melting of metal species such as contacts by arc heat and carbon particles generated from an insulating material. The conventional insulating material disclosed in patent document 1 has a problem that the reduction of the insulating performance cannot be suppressed because the oxidation or high resistance action of the conductive material due to the thermal decomposition gas of the resin and the filler is insufficient. In addition, in patent document 2, although the above-described oxidation-high resistance effect is imparted by adding water-containing microcapsules, there is a problem that the microcapsules themselves are broken, and the core material volatilizes and flows out to cause a decrease in heat resistance and mechanical strength of the molded article.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an arc-extinguishing insulating material molded body which can maintain the insulating performance of the surface of the molded body after the arc interruption and has excellent heat resistance and mechanical strength.

Means for solving the problems

The present invention provides an arc-extinguishing insulating material molded body characterized in that the amount of oxygen atoms contained per unit volume is 1.75 × 10^-2[mol/cm³]The above thermosetting resin cured product is formed.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, an arc-extinguishing insulating material molded body that can maintain the insulating performance of the surface of the molded body after an arc is interrupted and has excellent heat resistance and mechanical strength can be provided.

Drawings

Fig. 1A is a schematic front view showing a state in which an arc extinguishing device in a circuit breaker according to embodiment 2 is blocked.

Fig. 1B is a schematic side view of an arc suppression device including a section along Ib-Ib shown in fig. 1A.

Fig. 2 is a schematic perspective view illustrating an arc extinguishing device in the circuit breaker according to embodiment 2.

Fig. 3 is a schematic cross-sectional view of an example of the circuit breaker according to embodiment 2.

Fig. 4 is a partial cross-sectional view of the circuit breaker shown in fig. 3.

Fig. 5A is a schematic side view showing an example of the arrangement relationship between the fixed contact and the arc extinguishing insulating material molded body.

Fig. 5B is a schematic plan view showing the arrangement relationship between the fixed contact and the arc extinguishing insulating material molded body shown in fig. 5A.

Fig. 6 is a schematic cross-sectional view of an example of a circuit breaker according to embodiment 3.

Fig. 7 is a partial cross-sectional view of the circuit breaker shown in fig. 6.

Fig. 8A is a sectional view of an apparatus used in an insulation test in the example.

Fig. 8B is a side view of an apparatus used in the insulation test in the embodiment shown in fig. 8A.

Fig. 9A is a graph showing the relationship between the surface resistivity of the central portion of the molded article after the arc interruption and the amount of oxygen atoms contained in the molded article.

Fig. 9B is a graph showing the relationship between the surface resistivity of the end portion of the molded body after the arc interruption and the amount of oxygen atoms contained in the molded body.

Detailed Description

Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the following embodiments, and can be modified as appropriate within a scope not departing from the gist of the present invention. In the drawings shown below, the scale of each part may be different from the actual scale for easy understanding. The same applies between the drawings.