Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
  • H01H73/02—Details
  • H01H73/06—Housings; Casings; Bases; Mountings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/02—Housings; Casings; Bases; Mountings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H2009/0077—Details of switching devices, not covered by groups H01H1/00 - H01H7/00 using recyclable materials, e.g. for easier recycling or minimising the packing material
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/02—Housings; Casings; Bases; Mountings
  • H01H71/025—Constructional details of housings or casings not concerning the mounting or assembly of the different internal parts
  • H01H71/0257—Strength considerations

Definitions

• the present invention relates to a circuit breaker that rotates a movable contact when an overcurrent is detected, and extinguishes an arc generated between contacts by an arc extinguishing device.
• thermosetting resins As the base of conventional circuit breakers, those having a thermosetting resin as a main component have been often used because requirements such as heat resistance, arc resistance, and mechanical strength can be relatively easily achieved.
• thermosetting resins require incineration or landfilling of burrs generated during molding and sprues and runners generated during injection molding, making it difficult to recycle or reuse burrs, sprues and runners.
• thermoplastic resin comprising nylon 6, nylon 66, and nylon MXD 6 disclosed in Japanese Patent Application Laid-Open No. 08-171 847, an inorganic compound that undergoes a dehydration reaction at 200 ° C. or more, and a reinforcing material
• a molded article containing (1) and (2) is excellent in flame retardancy and insulation performance after electrode opening and closing, and is also suitable as a molded article for a circuit breaker.
• the characteristics required for the base especially the heat resistance, are insufficient.
• the base (the melting point of nylon 6 serving as the main resin of about 2 15 ° C.) described in Japanese Patent Application Laid-Open No. 08-171 8 Applicable to circuit breaker with 5 amp frame, rated current 2 25 A, overload cutoff
• the over-label value between the contacts decreased, and the contact pressure between the contacts sometimes decreased abnormally. At this time, it was found that the vicinity of the surface of the base fixing the contact fixed to the base was melted.
• the decrease in the excess label value, the decrease in the contact pressure between the contacts, and the melting of the area near the base are considered to be caused mainly by the arc heat generated by the interruption.
• the portion near the base to which the fixed contact is fixed melts, not only the contact pressure between the contacts becomes unstable, but also the contact portion of the base with the fixed contact is deformed by repeating opening and closing. Further, there is a concern that the overflow label value may be reduced.
• the over-travel value is the amount by which the movable contact moves to the fixed contact when the fixed contact is removed while the contacts are in contact. It is set to several times the thickness of the contact with a margin to keep the thickness.
• the structure that holds the contacts, such as the base, the movable contact, and the fixed contact receives the reaction force to maintain the contact pressure between the contacts, and the structure is deformed due to the reaction force.
• the clip deforms and the annual label value decreases over time.
• thermoplastic resin is polybutylene terephthalate (abbreviation: PBT, melting point: about 220 ° C) or polyethylene terephthalate (abbreviation: PET, melting point: about 255 ° C). Met.
• PBT polybutylene terephthalate
• PET polyethylene terephthalate
• the present invention has been made in order to solve such a problem. Excellent heat resistance and arc resistance. Especially, to obtain a circuit breaker with less melting and thermal deformation, even when subjected to a high temperature heat history, such as generated during overcurrent trip or repeated occurrence. With the goal.
• the movable contact when the overcurrent is detected, the movable contact is rotated, and the arc generated between the other contacts provided at a position facing the contact of the movable contact is extinguished by the arc extinguishing device.
• the main component is a crystalline thermoplastic resin, and an insulating molded product that has been subjected to electron beam irradiation after molding is used.
• a circuit breaker having excellent arc resistance can be obtained.
• the circuit breaker is provided with an opening / closing mechanism having a movable contact and a holding holder for rotatably holding the movable contact, another contact and an arc extinguishing device, and rotating the holding holder. It has a base that holds as much as possible and holds the other contacts, and a cover that covers the base to form a housing. Since the molded article is the base described above, heat resistance and over travel between contacts are provided. Excellent characteristics.
• the base has a bottom on which the holding holder, another contact point and the arc extinguishing device are arranged, and a side wall provided orthogonal to the bottom and bounding the outside, and the base has a bottom. Since the electron beam irradiation is performed and the side wall of the base is not irradiated with the electron beam, the heat resistance due to the arc heat generated at the time of arc generation and the shock resistance against a rise in the internal pressure of the housing are excellent.
• the base has a holding holder, another contact and an arc extinguishing device arranged on an arrangement portion provided along the rotating surface of the movable contact, and the arrangement portion is irradiated with an electron beam.
• heat resistance and arc resistance are excellent, and fine processing becomes possible, contributing to miniaturization of the outer diameter and higher density of parts.
• the molded product has a strength of 60 to 200 parts by weight based on 100 parts by weight of the resin component. Since it contains chemical material, it hardly generates melting or thermal deformation, and has excellent arc resistance and strength.
• FIG. 1 is a diagram showing an appearance of a circuit breaker according to Embodiment 1 of the present invention.
• FIG. 2 is a view in which a cover is removed from the external view of FIG.
• FIG. 3 is a view showing the appearance of the holding holder of FIG.
• FIG. 4 is an enlarged sectional view showing a contact portion of FIG.
• FIG. 5 is a top view schematically showing the pace of FIG.
• FIG. 6 is an explanatory diagram of electron beam irradiation on the base shown in FIG.
• FIG. 7 is a diagram showing a positional relationship between the base and the electron beam shielding jig at the time of electron beam irradiation in FIG.
• FIG. 8 is a diagram showing another example of the electron beam irradiation jig of FIG.
• FIG. 9 is a view showing another example of the electron beam irradiation jig of FIG.
• FIG. 10 is a diagram showing a mold for molding a base for a 222 amp frame according to the first embodiment of the present invention.
• FIG. 11 is a diagram showing the appearance of a circuit breaker according to Embodiment 2 of the present invention.
• FIG. 12 is an explanatory view showing a part of the circuit breaker shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
• FIG. 1 is a diagram showing the appearance of the circuit breaker according to Embodiment 1 of the present invention
• FIG. 2 is a diagram showing the appearance of FIG. 1 with a cover removed
• FIG. 3 is a diagram of the holding holder of FIG. Fig. 4 is an external view
• Fig. 4 is an enlarged cross-sectional view of the contact part
• Fig. 5 The figure is a top view schematically showing the base of FIG.
• 1 is a circuit breaker
• 2 is a base formed of an insulating resin molded product
• 3 is a formed of an insulating resin molded product, and is covered with the base 2 to form a housing with the base 2
• Covers 4 are handles for opening and closing the movable contact 5 from the outside of the cover 3 via an opening / closing mechanism 7 and a holding holder 6, and 6 is a movable contact 5 which is turned to a movable element holding portion 6A (FIG. 3).
• the holding holders 7 movably hold the metal frame 7 A supported by the base 2, and the opening and closing mechanism drives the holding holder 6 to open and close. 8 detects the overcurrent and trips the opening and closing mechanism.
• the overcurrent detector 9 is an arc-extinguishing device that extinguishes the arc generated between the contacts 5A and 10A, and insulates multiple metal arc-extinguishing grid plates 9A (Fig. 4). It is supported by the grid side plate 9B.
• 10 is a base contact (corresponding to a fixed contact) provided with a contact point 10 A facing the movable contact 5 A, and 11 is a base contact 10 around the support pin 12.
• a support member that rotatably supports and forms an electric path, 13 is a flexible copper wire that electrically connects the support member 10 and the fixed conductor 14, and 15 is an insulating member that covers the fixed conductor 14. is there.
• the base 2 has a base-side contact 1 OA via a switching mechanism 7, an overcurrent detector 8, an arc extinguishing device 9, and a support member 11 on its bottom 2C (FIGS. 5 and 7).
• the terminal plates 14A and 16 (Figs. 4 and 2) are placed on the terminal plate holders 2D and 2E, and the holder holder 1F is used to hold the holders. 6 supports the rotating shaft 6B (Fig. 3).
• the arc extinguishing device 9 and the base contact 1OA are close to the arc generated between the contacts 5A and 1OA, and the area where the influence of heat generated by the arc is large is 2 G (Fig. 5).
• a side wall 2A forming a boundary with the outside and an inter-phase wall 2B for insulating between phases are provided by integral molding.
• a contact portion of the base-side contact 10 provided with the contact 10 A with the support portion 11 and a support of the opening / closing mechanism are provided. A large force acts on the supporting portion of the rotating shaft 6B of the holding member 6.
• the base 2 is a molded article mainly composed of a crystalline thermoplastic resin, and is irradiated with an electron beam.
• the electron beam is a narrow and narrow flow of electrons that is almost straight, and is widely used in the field of medical supplies for the purpose of sterilization.
• the heat-resistant continuous use temperature will be 120 Polyesters and polyamides having a temperature of at least C are preferred. Polyester is preferred because of its minimal effect of moisture absorption, and polyethylene terephthalate (PET) Tpolybutylene terephthalate (PBT) is suitable. Also, these alloys may be used. A resin having no benzene ring, for example, a polyamide is preferable in terms of good traffic performance and insulation performance after interruption, and nylon 12, nylon 6, and nylon 66 are suitable.
• the crosslinking accelerator is added in an amount of 0.5 to 2 parts for the purpose of mainly promoting the crosslinking of the amorphous portion in the crystalline thermoplastic resin by electron beam irradiation.
• the cross-linking accelerator include polyfunctional monomers such as triallyl isocyanate (abbreviated as TAIC), trishydride and succinyl isocyanate (abbreviated as THEICA), and trisully and isocyanate.
• TAIC triallyl isocyanate
• THEICA succinyl isocyanate
• TMPTA trimethicone-luppan pantria acrylate
• the antioxidant is added in an amount of 0.2 to 0.9 parts for the purpose of preventing self-crosslinking of the crosslinking accelerator during kneading of the materials. 0.4-0.6 parts preferable.
• a hindered phenol-based antioxidant is preferable, and 2,6-di-t-butyl-P-cresol (abbreviated as BH), triethylene glycol-bis [3- (3- t-butyl-5-methyl-4-hydroxyphenyl) probionet], 1,6-hexanedibis-bis [3- (3,5-di-t-butyl-14-hydroxyphenyl) pro Bionet], pentaerythrityltetraxtrakis [3- (3,5-di-t-butyl-1-4-hydroxyphenyl) propionate], N, N'-hexamethylenebis (3,5-g-t- Butyl-1-hydroxy-hydrocinnamide), 3,5-di-t-butyl-14-hydroxybenz
• the reinforcing material is represented by glass fiber.
• the glass fiber refers to a fiber-like fiber made of glass, and examples of the glass material include E glass, S glass, D glass, T glass, and silica glass.
• the diameter of the glass fiber is 6 to 13 mm and the aspect ratio is 10 or more from the viewpoint of improving the impact strength.
• inorganic filler examples include alumina, calcium carbonate, myriki, clay, talc, kaolin, and wall aluminite.
• Flame retardant materials include red phosphorus, phosphate ester, and halogen-based materials.
• Phosphoric acid ester-based and halogen-based materials are extremely low in metal corrosion, including contact points 5 A and 10 A. Is preferred.
• a halogen-based compound is preferable because it exhibits flame retardancy with a smaller amount of addition than a phosphate-based compound.
• dibromopolystyrene is preferred because it is difficult to decompose even if it stays in the cylinder during molding.
• antimony trioxide is preferred because it enhances the synergistic effect with the halogen type.
• FIG. 6 is a schematic diagram of electron beam irradiation on the base shown in FIG. 5, and FIG. 7 is a diagram showing a positional relationship between the base and the electron beam shielding jig at the time of electron beam irradiation of FIG. Are indicated by broken lines. 8 and 9 are diagrams showing another example of the electron beam irradiation jig of FIG.
• reference numeral 40 denotes an electron beam irradiation device
• 41 denotes an electron beam
• 50 denotes an electron beam shielding jig.
• a 4 mm thick iron plate is provided with a passage hole 51 through which the electron beam 41 passes. ing.
• the passage hole 51 opens to the bottom 2C of the base 2, while the side wall 2A of the base 2 and the terminal plate holding portions 2D and 2E are shielded from the electron beam. It is shielded by the jig 50.
• FIG. 6 shows an example in which the electron beam shielding jig 50 is separated from the base 2, but the electron beam shielding jig 50 may be directly placed on the base 2.
• the electron beam 41 radiated in parallel from the electron beam irradiator 40 is radiated to the base 2 which is a straight object to be irradiated, and passes through the bottom 2C.
• the electron beam shielding jig 50 bridges the bottom surface 2 C of the base 2, while the side wall 2 A and the terminal plate holding portions 2 D and 2 E are not crosslinked because the electron beam 41 is shielded.
• a crystalline thermoplastic resin contains an amorphous portion in accordance with the degree of crystallinity, and when the molded product (base 2) ′ is irradiated with an electron beam 41, the crystalline thermoplastic resin contains a non-crystalline portion. The amorphous part is crosslinked to form a three-dimensional network structure.
• the resin material of the molded article contains a cross-linking accelerator and an antioxidant in addition to the materials constituting the ordinary resin, such as a base resin, a reinforcing material, an inorganic filler, a flame retardant, and a flame retardant auxiliary. ing.
• Irradiation with the electron beam 41 crosslinks the amorphous portion, but if the electron beam 41 is weak and does not penetrate the molded product, there is a problem that electrons will remain inside the molded product.
• 1 is desirably a strength that penetrates the molded article.
• the accelerating voltage of electron beam irradiation only penetrates through the bottom 2 C of base 2 with a thickness of 2 mm.
• 2 MV or more is preferable from the condition of cross-linking, 3 to 5 MV is optimal to prevent the irradiated electron beam from remaining as space charge in the material. From the viewpoint of preventing electrons from remaining, it is preferable not to irradiate the electron beam to the interphase wall 2B other than the thin holder holder 2F.
• the entire interphase wall 2B or the interphase wall 2B except for the holding holder receiving 2F portion is shielded. It is preferable to use a jig having a shape.
• the overcurrent detector 8 detects the overcurrent and gives a trip command to the switching mechanism 7.
• the opening / closing mechanism 7 rotates the holding holder 16 counterclockwise in FIGS. 2 and 4 by the accumulating force of the toggle link mechanism, and the movable contact 5 also moves with the holding holder.
• the contacts 5A and 10A are opened and an arc is generated between the contacts 5A and 10A. This arc is electromagnetically attracted to the arc extinguishing device 9 and extinguished.
• the contacts 5A and 1OA are separated by the electromagnetic repulsive force before the opening / closing mechanism 7 is opened.
• the area that is greatly affected by the arc when the arc is generated is the area 2G (FIG. 5) where the arc extinguishing device 9 and the contact 5A s 1OA are provided. Also, a contact portion 2 G of the base contact 10 with the contact 1 OA provided with the support portion 11, a support portion of the frame 7 A of the opening / closing mechanism 7, and a support portion of the rotating shaft 6 B of the holding holder 16. A large force acts on. '
• the crystalline thermoplastic resin is used as the main resin, and the insulating base 2 that has been subjected to electron beam irradiation after molding is used, so that the fine workability of the thermoplastic resin, sprue and runner A base 2 having excellent heat resistance and arc resistance was obtained while enjoying the advantages of recyclability and the like. Furthermore, even when subjected to a high-temperature thermal history, the base 2 has less occurrence of melting and thermal deformation and has excellent creep resistance, and therefore has little effect on the contact pressure between the contacts 5A and 10A. could be obtained. In addition, since the holding holder receiver 2F of the interphase wall 2B is also irradiated with the electron beam, the heat resistance and the over-label property between contacts are excellent.
• the base 2 when the molded article contains 60 to 200 parts by weight of the reinforcing material with respect to 100 parts by weight of the resin component, the base 2 is less likely to melt and thermally deform, and has excellent creep resistance and strength. Therefore, the decrease in the contact pressure was particularly small.
• a structural material containing a large amount of reinforcing material was very useful when applied to the base 2 where local heat is applied and a high temperature such as arc heat acts on the portion. .
• the bottom 2C of the base 2 is bridged, and the side walls 2A are shielded from the electron beam and are not bridged. Less deformation and excellent creep resistance. Conversely, if the impact performance decreases due to bridging, the side wall may be damaged due to the internal pressure generated at the time of short circuit interruption, but the base side wall 2A is not bridged and has excellent impact resistance Therefore, a base 2 having both heat resistance and impact resistance can be obtained.
• FIG. 10 is a diagram showing a mold for forming a base for a 225 amp frame according to the first embodiment of the present invention.
• reference numeral 90 denotes a fixed mold 90 A and a movable mold 90 B, and the inside thereof is a mold formed along the base 2.
• Reference numeral 91 denotes an inlet for the mixed material formed in the fixed mold 90A. From the injection port 91 located at the center of the fixed mold 90 A, the mixed material is moved by a 250-ton injection molding machine using a movable mold temperature of 85 to 95 ° C and a fixed mold temperature of 85 to 9. 5 ° C, Cylinder temperature 230 to 280 ° C, Holding time and injection time The base 2 was molded under the condition that the total of the values was 10 seconds.
• the molded product is covered with the 4 mm® iron electron beam shielding jig 50 on the four side walls 2 A, 2 D, and 2 E (FIG. 5) by the method shown in FIG. Then, electron beam irradiation was performed at an acceleration voltage of 2 MV using a Nisshin High Voltage electron beam irradiation apparatus.
• the surface of the contact part of the fixed contact and its vicinity (the support part 11 of the base contact 10 and the bottom 2C of the base 2C and a part of the area 2G in Fig. 5) If not melted, it was accepted, and if it was melted, it was rejected.
• Tables 1 and 2 show the test results.
• the resin (resin) in the table includes the number of parts including the flame retardant material and the flame retardant auxiliary material.
• Samples (11) to (15) and Comparative Examples (21) to (24) were added with 15 parts of dibromopolystyrene as a flame retardant and 5 parts of antimony trioxide as a flame retardant aid.
• Samples (11) to (15) and Comparative Examples (22) and (24) also include triaryl isocyanate (abbreviated TAIC) as a crosslinking accelerator, and 2,6-diamine as an antioxidant.
• TAIC triaryl isocyanate
• BHT t-butyl-P-cresol
• Samples (14) to (15) and Comparative Examples (23) and (24) each contain 8 parts of an ethylene / propylene copolymer as a shock absorbing material.
• a nylon 6 composite material containing a crosslinking accelerator and an antioxidant is added.
• the circuit breaker using the samples (11) to (15) composed of the base 2 consisting of the base material shall be such that the stator contact area of the base 2 and its vicinity melt even after the overload cutoff test. It was superior in heat resistance and arc resistance compared to a circuit breaker using a base without electron beam irradiation. Therefore, it is easily expected that the bar travel characteristics between the contacts during use over time will be excellent.
• the circuit breakers using the samples (14) to (15) have excellent impact resistance; and, especially when the base 2 is molded with the mold shown in FIG.
• the bottom 2C of 2 has increased mechanical strength due to cross-linking by electron beam irradiation (however, the impact resistance has been reduced), and the side wall 2A is not irradiated with the electron beam and has excellent impact resistance Therefore, it was preferable because it could sufficiently withstand the internal pressure rise caused by the arc generation.
• FIG. 11 is a diagram showing the appearance of a circuit breaker according to Embodiment 2 of the present invention
• FIG. 12 is an explanatory diagram showing a part of the circuit breaker shown in FIG.
• reference numeral 20 denotes an insulating casing, which is composed of a base 21 and a cover 22 formed of the same material as the base 2 described in the first embodiment and the first embodiment.
• the base 21 includes a side portion (arrangement portion) 21 A that constitutes one side surface of the circuit breaker, and a wall portion 2 orthogonal to the side surface portion 21 A from an outer peripheral edge of the side surface portion 21 A. 1 B is formed by body molding.
• An arc extinguishing device 38 and a fixed contact 23 are arranged inside the side surface 21 along the rotating surface of the movable contact 25.
• the cover 22 is formed in a flat plate shape, is provided to face the side surface 21 A of the base 21, and constitutes the other side surface of the circuit breaker.
• the shroud is fixed by rivets.
• the side surface 21 A and the cover 22 of the base 21 are irradiated with an electron beam in the same manner as in the first embodiment and the first embodiment.
• an electron beam shielding jig 50 is used as shown in FIG. 6 so that the cylindrical wall 21 B is not irradiated with the electron beam at all. It is preferable that the portion in contact with the cover 22 is not too hard and is not easily cracked or chipped. On the other hand, it is preferable not to use the electron beam shielding jig 50 from the working efficiency of electron beam irradiation. ,
• a movable circuit having a fixed contact 23, a fixed contact 24 fixed to the fixed contact 23, and a movable contact 25 a facing and separating from the fixed contact 24 is provided in the breaking circuit.
• a contact 25 is provided.
• Reference numeral 26 denotes an arm (a holding member for rotatably holding the movable contact 25) integrally supporting the movable contact 25.
• the arm 26 has a U-shaped groove 26a and a stopper portion 26 for stopping the stopper. b and an elongated hole 26 c with which the shaft 27 is engaged are formed.
• Reference numeral 27 denotes a shaft serving as a rotation center of the arm 26 (holding member) and the movable contact 25, and is supported by the insulating casing 20.
• Reference numeral 28 denotes a main panel that is stretched so as to constantly bias the movable contact 25 from the fixed contact 24, 29 denotes a handle made of synthetic resin, which is opened and closed from the outside, and 30 denotes a handle.
• a reset panel that urges the handle 29 counterclockwise, 31 is an operation link formed by bending a round bar into a U shape, one end of which engages the handle 29, and the other end of which is a latch 3 2 engages with the link engagement groove 32a.
• the handle 29 includes a handle 29 b protruding out of the insulating housing 20 and a protrusion 29 c connecting the operation link 31.
• Reference numeral 3 2 denotes a latch pivotally supported by the shaft 27, and a link engaging groove 3 2 a engaging with the other end of the operation link 31, and a pressing force of the rod 37 of the electromagnetic trip portion 34.
• a trigger piece 32c is formed which receives a force in a direction in which the link 31 and the link engagement groove 32a are disengaged.
• a return panel 32 d is contracted between the arm 26 and the latch 32, and constantly biases the latch 32 counterclockwise with respect to the arm 26.
• the other end of the operation link 31 fitted into the U-shaped groove 26a is held in the link engagement groove 32a of the latch 32 by the panel force of the panel 32d, and is locked. ing.
• the movable contact 25a resiliently contacts the fixed contact 24, and a breaking circuit is formed (the state shown in FIG. 12).
• the arm 26, the main panel 28, the handle 29, the reset panel 30, the operation link 31, and the latch 32 constitute an opening / closing mechanism.
• An overcurrent tripping device is formed by the pi metal 33 and the electromagnetic tripping device 34.
• Reference numeral 38 denotes an arc extinguishing device
• 39 denotes an arc extinguishing plate of the arc extinguishing device 38.
• An arc generating chamber 40 includes the fixed contact 24 and the movable contact 25, and is filled with an arc generated when the movable contact 25 is opened.
• Reference numeral 41 denotes an arc runner for guiding an arc toward the arc extinguishing device 38.
• the electromagnet 35 of the electromagnetic trip device 34 senses the short-circuit current, and the plunger 36 is attracted, and the rod 3 interlocked therewith is actuated. 7 moves to the left. Then, the trigger piece 32b is pressed by the rod 37, and the latch 32 rotates clockwise against the panel force of the return panel 32d. In the U-shaped groove 26a, the operation link 31 that was locked and fitted by the link engagement groove 32a was inserted. The other end is free from the arm 26 by the clockwise rotation of the latch 32.
• the arm 26 is forcibly rotated clockwise about the shaft 27 by the panel force of the main panel 28 as an opening mechanism to perform a tripping operation.
• the movable contact 25 is opened at a high speed and performs a breaking operation.
• the 2 1 c and the electromagnetic trip fixing section 2 1 d will be described.
• the protrusion 21 a is provided so as to protrude so as to support one end of the main spring 28, and a force acts on the main spring 28.
• the handle bearing portion 21b is provided so as to support the rotating shaft of the handle 29, and a force acts from the shaft.
• the arm bearing portion 21 c is provided so as to support the rotating shaft 27 of the arm 26 and the movable contact 25, and a force acts on the rotating shaft 27.
• the electromagnetic trip fixing portion 21 d is a rib provided to position the electromagnetic trip device 34 on the base 21, and is provided via the fixed contact 23 and the electromagnetic trip device 34. A force is acting from the movable contact 25.
• the electron beam was applied to the side surface (arranged portion) 21 A of the base 21, it was possible to enjoy the advantages of the fine workability of the thermoplastic resin and the recyclability of sprues and runners.
• the heat resistance is improved and the arc resistance is improved.
• the cover 22 is also irradiated with an electron beam, the heat resistance is improved and the arc resistance is improved.
• the circuit breaker in which the arm 26, the fixed contact 23, and the arc extinguishing device 38 are arranged along the rotating surface of the movable contact 25 The breaking capacity is smaller than that of the circuit breaker in which the holding holder, other contacts and the arc extinguishing device are arranged at the bottom of the base as in the first embodiment. Because the energy of the arc is small, there is a tendency that insulating molded articles such as the base 21 and the cover 22 are arranged closer to the arc.
• the arc extinguishing side wall for fixing the arc extinguishing plate 39 is not required, and the arc extinguishing is performed by directly fitting into the grooves of the base 21 and the cover 22.
• the device 38 can be constructed, the number of parts can be reduced, and the width of the circuit breaker of the arc extinguishing plate 39 in the width direction (the direction penetrating through the paper of Fig. 12) can be extended to extinguish the arc. The performance can be improved.
• the projections 21a, the handle bearings 21b, the arm bearings 21c and the electromagnetic tripping fixing parts 21d also increase their mechanical strength by electron beam irradiation, so they are thermoset. It can compensate for the shortcomings of thermoplastic resins, especially nylon, which are softer and less precise in positioning accuracy than non-conductive resins.
• the base 21 has a box shape and the cover 22 has a flat plate shape.
• the present invention is not limited to this shape, and the base 21 and the cover 22 are not limited to this shape. Both may be box-shaped.
• a single-pole circuit breaker has been described.
• two poles are provided between base 21 and cover 22 in parallel in the thickness direction of the circuit breaker.
• It may be a two-pole circuit breaker.
• a center base is provided to insulate the two poles side by side, and this center base has a movable contact 25, a handle 29, and an electromagnetic trip device. 34 or the like may be provided.
• the center-base may be a molded product formed with the same composition as the base of the second embodiment and irradiated with an electron beam.
• the present invention is required to have heat resistance, anti-arc property, and excellent label characteristics between contacts, and to form a circuit breaker which is mainly composed of a thermoplastic resin and which can be recycled or reused such as burrs, sprues, and runners. It can be used as a product.

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Citations (8)

• 2001
  • 2001-11-20 WO PCT/JP2001/010134 patent/WO2003044818A1/ja active IP Right Grant
  • 2001-11-20 DE DE60139216T patent/DE60139216D1/de not_active Expired - Lifetime
  • 2001-11-20 KR KR10-2003-7009255A patent/KR100528152B1/ko active IP Right Grant
  • 2001-11-20 JP JP2003533387A patent/JP4177255B2/ja not_active Expired - Fee Related
  • 2001-11-20 EP EP01982867A patent/EP1475817B1/en not_active Expired - Lifetime
  • 2001-11-20 CN CNB018219608A patent/CN1255839C/zh not_active Expired - Fee Related
  • 2001-11-29 TW TW090129499A patent/TW526509B/zh not_active IP Right Cessation

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