JPH02284328A - Arc-extinguishing device for switch - Google Patents

Abstract

PURPOSE:To eliminate requirement of limiting a material for a body or cover to a suitable material for an arc so as to reduce cost by forming a box-state insulation box of the lower surface opening covering an arc-extinguishing device with a material having high arc resistance, and positioning the upper surface of the insulation box with a cover abutted. CONSTITUTION:An insulation box 48 covering an arc-extinguishing device 44 is formed in a box state of the lower surface opening, and a material of the insulation box 48 is composed of that having an excellent arc resistance, e.g. premix. Since thus the insulation box 48 is composed of the material having the excellent arc resistance, it is unnecessary to use a material having the excellent arc resistance as a material for a body 10 or cover 36 using many molding materials for insulation between phases and insulation at the time of short circuit. Since this enables manufacture of the body or cover with an optional material, e.g. thermoplastic resin, low cost can be intended.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an arc extinguishing device for a switch having an arc extinguishing device for extinguishing arc gas generated by opening of a contact portion.

[Prior Art] FIG. 14 shows an exploded perspective view of the main parts of a switch whose body and cover are divided into upper and lower parts, in which an electromagnet part 7 is housed in a mounting base 1, and A conversion shaft 8 for converting the horizontal movement of the movable core 5 of the electromagnet section 7 into the vertical direction is installed. This conversion shaft 8 is rotatably connected to the lower end of a connecting bin 19, and the upper end of the connecting bin 19 is connected to a link mechanism (
It is rotatably connected to a member (not shown).

Further, in order to prevent the connecting pin 19 from coming off from the link mechanism after being assembled, a spacer 62 is fitted from above to prevent the connecting pin 19 from coming off.

A power terminal portion 39 is disposed at one end of the body 10 disposed above the mounting base 1. In addition, since this RvR device has a 3-row configuration, there are three. Arc extinguishing device 4
4 is composed of two side plates 45, a plurality of grid plates 46 arranged in parallel between the two side plates 45, and insulating plates 47 located outside the side plates 45, respectively. Further, the power terminal portion 39 is installed from above, and therefore a partition plate 61 provided with an exhaust hole 60 is disposed outside the arc extinguishing device 44.

[Case M that the invention attempts to solve] Such 3f! An integrated switch has an arc extinguisher! In order to insulate the f44, a method is adopted in which it is separated by a partition wall 10a which is a part of the body 10. Therefore, the entire body 10 must be made of a molded product with good arc resistance, which poses a problem of high cost.

Further, since the cover covering the upper surface of the body 10 is also exposed to the arc, there is a similar problem.

The present invention has been provided in view of the above-mentioned points, and provides an arc extinguishing device for a switch that has good arc insulation properties without limiting the material of the body and cover to materials that are good against arcs. It is intended for this purpose.

[Means for Solving the Problems] The present invention includes inserting and arranging a box-shaped insulating box with an opening at the bottom that covers the arc extinguishing device and the contact portion from above, and forming the insulating box from a material with high arc resistance. The upper surface of the insulating box is positioned by abutting the above cover.

Additionally, exhaust holes for discharging arc gas are bored on both sides of the insulating box.

Furthermore, exhaust holes for discharging arc gas are bored on both sides of the insulating box, and a substantially central portion of the ceiling surface of the insulating box is provided to protrude downward, and the ceiling surface is formed into an inclined surface that reaches both of the exhaust holes, respectively. It is something.

In addition, the switch has a three-pole structure and three arc extinguishers are installed in parallel.
Exhaust holes for discharging arc gas are bored on both sides of the insulating box, and ribs are integrally formed on the bottom surface of the cover to separate the arc gas discharged from the exhaust hole of one of the insulating boxes on both sides into the left and right sides. .

[Function] Accordingly, in the present invention, the insulating box covering the arc extinguisher and the contact portion is made of a material with high arc resistance, and the body and cover do not need to be made of materials with good arc resistance. I'm trying to be good.

Further, in claim 2, the arc gas is smoothly exhausted from the exhaust holes on both sides of the insulating box.

Furthermore, in claim 3, the arc gas is guided by an inclined surface formed on the ceiling surface of the insulating box, and the arc gas is smoothly discharged from the exhaust hole.

Moreover, in claim 4, the ribs separate the arc gas discharged from the exhaust holes of the left and right insulation boxes into left and right sides.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. First, the configuration of the entire switch will be explained. Incidentally, since the gist of the present invention is the arc extinguishing device, other parts will be briefly explained. Figure 1 shows a sectional view, Figure 2 shows a plan view with the cover removed, Figure 3 shows an exploded perspective view of the contact opening/closing mechanism block, and Figure 4 shows an exploded perspective view of the electromagnet block. There is.

Inside the mounting base 1 made of an insulating material, there are a fixed iron core 4 inserted into a coil bobbin 3 having a coil 2 wound around its outer periphery, a movable iron core 5 attracted to the fixed iron core 4, and both iron cores 4.5.
An electromagnet section 7 is installed, which includes a spring 6 interposed between the two and a spring 6 that urges the movable iron core 5 toward the open side. A conversion shaft 8 that converts horizontal movement into vertical movement is rotatably connected to the movable iron core 5 via a U-shaped pin 9.

The contact opening/closing mechanism section housed in the body 10 has a three-pole oval configuration, and includes a movable contact 12 to which a movable contact 11 is fixed.
is rotatably supported by the yoke 13. York 13
An arc traveling plate 14 is provided at one end, and a bimetal 15 for detecting overcurrent, a short circuit coil 16 for detecting short circuit current, etc. are arranged at the other end. 3 moving contacts 1
An interlocking plate 17 for interlocking the two together is disposed on the body 10 via a spring 18.

The conversion shaft 8 is rotatably connected to one end 19a of a connecting pin 19, and the other end 19b of the connecting pin 19 is connected to a substantially H-shaped link 20.
It is inserted into the hole 20a at the tip of and rotatably connected.

The link 20 is inserted into the long arc-shaped hole 24 of the frame 21 arranged on the bottom surface of the body 10 together with the latch plate 22.
3, they are rotatably connected. The engagement recess 25 of the latch plate 22 and the engagement piece 27 of the latch engagement plate 26 engage with each other, and the three engagement portions 28 of the latch engagement plate 26 are inserted into the short circuit coil 16 of the drive pin. It engages with the head of No. 29. A driving piece 32 for driving the latch engagement plate 26 is rotatably attached to a yoke 33, and this yoke 33 is attached to the frame 21. The yoke 33 is driven to press when an overcurrent is detected by the bimetal 15, presses and rotates the drive piece 32, and further presses the drive piece 32 and rotates the latch engagement plate 26.
is rotated, the latch plate 22 is rotated, and the latch engagement between the engagement piece 27 and the engagement recess 25 is released.

A handle 34 rotatably attached to the frame 21
The operating piece 35 protrudes from the opening 37 of the cover 36. Three load-side terminal sections 38 are arranged at one end of the body 10, and three power terminal sections 39 are arranged at the other end.

As shown in FIGS. 1 and 4, the terminal plate 41 to which the terminal screws 40 constituting the power supply terminal portion 39 are screwed is bent into a substantially two-shape shape and arranged along the bottom surface of the body 10. It is set up. A fixed contact 42 facing the movable contact 11 is fixed on the terminal plate 41, and an arc running plate 43 is also attached. The movable contact 11 and the fixed contact 42 constitute a contact section, and an arc extinguishing device 44 is formed above the contact section and the terminal plate 41.

As shown in FIG. 4, the arc extinguishing device 44 includes two side plates 45 and a plurality of grid plates 46 arranged in parallel between the two side plates 45.
and an insulating plate 47 located on the outside of the side plate 45. In addition, as shown in FIG.
Arc running plates 43, 14 are located on both sides of 6, respectively. An insulating box 48 covering this arc extinguishing device 44 is formed in a box shape with an opening on the bottom, and has an exhaust hole 49 bored in the upper part on the terminal screw 40 side for exhausting arc gas generated when the contacts are opened. Three insulating boxes 48 are provided corresponding to the three arc extinguishers 44. The material of the insulating box 48 is a material with good arc resistance, such as premix. Since the insulating box 48 is made of a material with good arc resistance, the material of the body 10 and cover 36, which use a large amount of molding material, has good arc resistance for insulation between phases and insulation in the event of a short circuit. There is no need to make it good. Therefore, it is possible to use thermoplastic resin as the material for the body 10 and the cover 36, which reduces material costs, makes it easier to mold, and allows complex shapes to be formed, and reduces costs by shortening the molding cycle. I can do it.

As shown in FIG. 1, one side plate 48a of the insulating box 48 is
It is inserted between the arc traveling plate 43 and the vertical piece 41a of the terminal plate 41, and the other side plate 48b of the insulating box 48 is inserted outside the other arc traveling plate 14. That is, the insulating box 48 is inserted from above the body 10, one side plate 48a of the insulating box 48 contacts the top surface of the terminal board 41, and the insulating box 48
8 is installed, the top surface of the insulating box 48 is brought into contact with the ceiling surface of the cover 36 to position and fix the insulating box 48. When the insulating box 48 is assembled, as shown in FIG. 2, the side surfaces of the insulating box 48 on both sides are close to the sides of the connecting bin 19, and serve to prevent the link 20 from being removed. A special part for preventing the connecting bottle 19 from being removed is not required, and the number of parts can be reduced. The insulating box 48 also has a terminal plate 41 of the power terminal section 39 on the side plate 48a.
Since the terminal board 41 is held down from above and the insulating box 48 is held down by the cover 36, parts for fixing the terminal board 41 are not required, and the number of parts can be reduced. Moreover, since it also plays the role of a conventional partition plate, the number of parts can be reduced.

FIG. 7 shows another embodiment of the insulating box 48, in which the upper parts of three insulating boxes are connected to form one insulating box 48. In this case, as compared to the previous embodiment, the three parts can be made up of one part, and the number of parts can be reduced and the efficiency of assembly can be improved.

By the way, in the previous embodiment, the arc extinguishing chamber was formed by the insulating box 48.
Since the structure is completely covered, insulation is good, but there is a problem with exhausting arc gas. In other words, as shown in FIG. 8, since the exhaust hole 49 of the insulating box 48 is provided on the outside, it is easy to exhaust the gas outside the insulating box 48, but the gas in the part A on the inside (rear side) Since the exhaust is poor, the transition of the arc to the arc running plate 14 is slow, and there is a problem that the current limiting characteristics are not good.

Therefore, in this embodiment, as shown in FIGS. 9 and 10, one large exhaust hole 50 is also provided in the upper part of the side plate 48b inside the insulating box 48. By providing the exhaust holes 49 and 50 on both sides of the insulating box 48 in this way, the gas inside can be better exhausted, so that the arc transfers to the grid plate 46 and the arc traveling plate 14 more quickly, improving the current limiting characteristics. is something that increases.

11 and 12 show a third embodiment of the insulation box 48,
The central part of the ceiling surface of the insulation box 48 is provided protrudingly, and both exhaust holes 49.
50, slopes 51 and 52 are formed respectively. Due to this inclined surface 51.52, the gas flows along the inclined surface 51.52 as shown by the arrow in FIG. 12, and the exhaust resistance is reduced.

Improves ventilation in the center of the ceiling. Therefore, the transition of the arc to the grid plate 46 is accelerated, and current limiting characteristics are improved.

FIG. 13 shows a fourth embodiment, in which ribs 53 are integrally formed on the cover 36 to separate gas from the exhaust hole 50 inside the left-right diameter insulating box 48 to the left and right. That is, the ribs 53 are formed in an L-shape so as to protrude outward, so that the gas exhausted from the exhaust hole 50 hits the ribs 53 and is exhausted outward. Therefore,
This eliminates the risk of phase-to-phase short circuits and increases safety.

[Effects of the Invention] As described above, the present invention includes inserting and arranging a box-shaped insulating box with an opening at the bottom that covers the arc extinguishing device and the contact portion from above, and forming the insulating box from a material with high arc resistance. Since the top surface of the insulating box is positioned by touching the above cover, the insulating box that covers the arc extinguisher and the contact part is made of a material with high arc resistance.
It is not necessary to use materials with good arc resistance for the body and cover, so the body and cover can be made of any material, such as thermoplastic resin, reducing costs. In addition, it has good moldability, so there are no restrictions on shape.Furthermore, the insulating box is inserted from above and the top surface of the insulating box is in contact with the cover, making it easy to assemble. This has the effect of providing good results.

In addition, since exhaust holes for discharging arc gas are bored on both sides of the insulating box, arc gas can be smoothly exhausted from the exhaust holes on both sides of the insulating box, which means that the escape of arc gas is not biased to one side. There was no such thing, so I had to exit from both sides.

This improves exhaust gas, speeds up arc travel to the grid plate of the arc extinguisher, and improves current limiting characteristics.

Furthermore, exhaust holes for discharging arc gas are bored on both sides of the insulating box, and a substantially central portion of the ceiling surface of the insulating box is provided to protrude downward, and the ceiling surface is formed with an inclined surface shaped into both of the exhaust holes, respectively. Therefore, arc gas flows to the exhaust hole along the slope formed on the ceiling of the insulation box, reducing exhaust resistance.
The central part is better vented, the arc gas can be smoothly discharged from the exhaust hole, the arc travels faster to the grid plate of the arc extinguisher, and current limiting characteristics are improved.

In addition, the switch has a three-pole structure and three arc extinguishers are installed in parallel.
Exhaust holes for discharging arc gas are bored on both sides of the insulating box, and ribs are integrally formed on the bottom surface of the cover to separate the arc gas discharged from the exhaust hole of one of the insulating boxes on both sides into the left and right sides. Therefore, the ribs can separate the arc gas discharged from the exhaust holes of the left and right insulation boxes into the left and right sides, eliminating the risk of phase-to-phase short circuits and improving safety.In addition, the ribs are formed on the cover. This provides the effect of preventing warping of the parts during molding, and furthermore, by integrally forming the ribs on the cover, the strength of the cover can be increased and the effect of preventing the cover from cracking can be obtained.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a plan view of the same with the cover removed, Fig. 3 is an exploded perspective view of the contact opening/closing mechanism block of the above, and Fig. 4 is an electromagnet of the same as the above. FIG. 5 is an exploded perspective view of the block; FIG. 6 is a sectional view of the same; FIG. 7 is a perspective view of another embodiment of the insulating box; FIG. 8 is a main part of the same. 9 is a perspective view of an insulation box according to another embodiment of the same, and FIG. 10 is a sectional view of the same as above, and FIG.
Figure 1 is a cutaway perspective view of the insulating box of Example 3 of the above, Figure 12 is a cross-sectional view of the main parts of the same, Figure 13 is a cross-sectional view of Example 4 of the same, and Figure 14 is an exploded view of the main parts of the conventional example. FIG. 10 is the body, 36 is the cover, 39 is the power terminal part, 41
is a terminal board, 44 is an arc extinguisher, 48 is an insulation box, 49.50
51 and 52 are inclined surfaces, and 53 are ribs. Agent Patent Attorney Ishi 1) Long 7] 0...Body 36...Cover 39 - Power terminal section 41...Terminal board Fig. 2 49...Exhaust hole Fig. 3 Fig. 6 Fig. 7 Figure 10 Figure 8 Figure 9 Figure 11 Figure 12 Figure 13 Procedural amendment written spontaneously) 1. Indication of the incident 1999 Patent Application No. 105107 2. Name of the invention Arc extinguishing device for switchgear 3. Amendment Relationship with the case filed by the person who filed the patent application Patent applicant address 1048 Kadoma, Kadoma City, Osaka Prefecture Name (58
3) Matsushita Electric Works Co., Ltd. Representative Toshio Miyoshi 4, Agent postal code 530 5, Date of amendment order [1] "Arc gas" in lines 13 to 14 of page 2 of the specification of the present application is replaced with "arc gas" Ark,” he corrected. [2] Delete the entire text from lines 1 to 5 on page 8 of the above and insert the following sentence. The yoke 33 is brought into contact with the eccentric cam of the adjustable dial 100, and the pivot position of the drive piece 32 is moved according to the rotational position of the adjustable dial lOO.The drive piece 32 detects overcurrent using the bimetal 15. It is pressed and driven when
Further, the latch engagement plate 26 is rotated, the latch engagement between the engagement piece 27 and the engagement recess 25 is released, and the latch plate 22 is rotated. j [3] Figure 3 of the attached drawings is corrected as shown in the attached sheet. Agent Patent Attorney Ishi 1) Choshichi

Claims (4)

[Claims] (1) A vertically split type switch consisting of a body with an open top surface and a cover that covers the open surface of the body,
A terminal board for the power terminal section is provided on the bottom of the body, a contact section is provided at the end of the terminal board, and an arc extinguishing device for extinguishing the arc generated when the contact section is opened is installed between the terminal board and the contact section. In the switch placed above, a box-shaped insulating box with an opening at the bottom that covers the arc extinguishing device and the contact part is inserted from above, and the insulating box is made of a material with high arc resistance, and the top surface of the insulating box is An arc extinguishing device for a switch, characterized in that the above-mentioned cover contacts and positions the switch. (2) The arc extinguishing device for a switch according to claim 1, wherein exhaust holes for discharging arc gas are bored on both sides of the insulating box. (3) Exhaust holes for discharging arc gas are bored on both sides of the insulating box, and approximately the center of the ceiling surface of the insulating box is provided to protrude downward, and the ceiling surface is formed into an inclined surface leading to both of the exhaust holes, respectively. The arc extinguishing device for a switch according to claim 1, characterized in that: (4) The switch has a three-pole structure and three arc extinguishers are installed in parallel.
Exhaust holes for discharging arc gas are bored on both sides of the insulating box, and ribs are integrally formed on the bottom surface of the cover to separate the arc gas discharged from the exhaust hole of one of the insulating boxes on both sides into the left and right sides. The arc extinguishing device for a switch according to claim 1.