JPS58169734A - Circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

The present invention relates to a circuit breaker that can cut off the circuit when the current continues to flow, and more particularly to a circuit breaker that effectively prevents direct release of arc gas and prevents the influence on peripheral equipment. In this type of circuit value disconnector, for example, U.S. Pat.
3 2 9, 9 1 3, Japan Special Public Service 1977-1825
8, a fixed contact having a fixed contact, a movable contact having a movable contact capable of contacting the fixed contact, and a movable contact that normally operates to separate the movable contact from the fixed contact. , and a manual opening/closing mechanism including a trip mechanism that forcibly separates the movable contact from the fixed contact, and an electromagnetic device that operates in response to short-circuit current or excessive current and that attracts the armature associated with the trip mechanism. and an arc extinguishing device disposed near the opening/closing position of the fixed contact and the movable contact. but

[Normally, when the movable contact is opened with respect to the identified contact via a manual opening/closing mechanism, the contact is opened and closed by K,
On the other hand, in the event of a short circuit or when an excessive current exceeding the rating continues to flow, the electromagnetic device operates, attracts the armature, and opens and closes the contact by separating the movable contact from the fixed contact via the trip mechanism. . The arc generated when the contact opens is transferred to an arc extinguishing device, where it is split, cooled, and extinguished. However, the well-known circuit breaker cannot effectively emit arc gas, which often adversely affects internal members. On the other hand, a device in which the casing is provided with an arc gas discharge port has been proposed, but there was a concern that the arc gas would be directly discharged outside the casing and affect peripheral equipment. Therefore, the main object of the present invention is to provide a circuit breaker which can effectively vent arc gas without directly emitting arc gas. □、4o＠o□、Eh、、－□O、Eh. It will become clear from the detailed explanation below along with □. It will be understood, however, that the invention is not limited to these examples only, but includes modifications within the scope of the appended claims. Referring to the drawing, a magnetic sensor is installed in the center of the cylinder in order to provide the sensor with a function that responds immediately to short-circuit currents and a function that responds with a delay effect to currents exceeding a predetermined rated value. A pair of plungers is provided sandwiching the head. To explain this in more detail, the purulence retention sensor O includes a magnetic yoke 11 having a substantially rectangular cross section and a longitudinal cylinder 1.
2 is included. The cylinder 12 has a lower cylinder body 1 made of a non-magnetic material, preferably brass, with an open upper end.
3 and 1 are provided with an upper cylinder body 14 made of a non-magnetic material, preferably plastic, which is open at both ends and has a slightly larger diameter than the lower cylinder body. A magnetic head 15 is fitted into the opening so as to interconnect both cylinder bodies 13 and 14. In addition, a viscous fluid, preferably silicone oil, is sealed in the lower cylinder body 13, and an oil plunger 16 made of a magnetic material and a coil spring 17 that normally presses toward the oil are housed. It passes through the center of the portion 18, a portion of which protrudes downward, and is fixed to the lower side portion 18. Furthermore, the upper cylinder body 14 is equipped with an operating plunger 19 made of a magnetic material.
The actuating plunger 19 is integrally provided with a rod portion 21 to which a head portion 30 is fixed, and the rod portion 8
1 is provided so as to be able to be ground outward from the upper end of the upper cylinder body 140. The upper end of the upper cylinder body 140 is fitted into a circular hole having a lip gr5 on the upper side 8m of the yoke 11 and is fixed. Further, a detection coil 24 is wound around the cylinder 12 substantially over the entire longitudinal direction thereof, and a detection coil 24 is wound around the cylinder 12, and a detection coil 24 is wound around the cylinder 12, and a detection coil 24 is wound around the cylinder 12 over the entire longitudinal direction thereof. One side of Q6 is connected to a lead wire 28 that extends substantially horizontally through one side of the yoke 11 and protrudes from the second side of the yoke 11 and has sufficient visibility, and the other side is led out from the open side of the yoke 11. Fold downwards.
(5) and is fixed to the terminal fitting 29 of the main disconnect switch. Further, the spring force of a coil spring, which will be described later, is normally applied to the actuating plunger 19 so as to displace it upward, so that the upper surface of the actuating plunger 19 is normally aligned with the upper cylinder body 14.
It is provided so as to be in contact with the inner surface of the upper end. A frame 31 for supporting a manual opening/closing mechanism including a trip mechanism is integrally provided at the upper end of the side arm of the sill 11 so as to extend substantially in the direction of extension of the upper side 51S211. The frame 314C includes a short frame portion 32 and a long frame portion 33 that extend vertically and parallel to each other. The short frame portion 32 includes a cutting edge portion 34,
Shaft holes 35 and 36 are respectively drilled in the upper corners near the trailing edge,
Further, a shaft hole 37 is bored near the rear edge below the shaft hole 36. - The ear part 34 of the short frame @32 is attached to the long blade frame part 33.
A huge l located in a position corresponding to! 38 has a shaft hole 39, and shaft holes 36 and 37 of the short frame portion 32 near the rear edge.
Shaft holes 40 and 41 are bored at positions corresponding to the respective positions. Further, a sliding window 42 in the shape of an inverted letter (6) is formed on the long frame portion 33 with an arcuate edge 43 on the negative side, and the moonlight end portion is bent at a substantially right angle. Furthermore, a locking portion 45 is provided on the upper edge of the bent portion 44, and a small disk-shaped arc running ear portion 46 extends horizontally on the lower edge. The cylindrical lower part 48 of the handle 17 of the manual opening/closing mechanism is provided with a shaft hole 49 at the center W6 and an enlarged part 31 having a through hole 50 in a part of the circumferential surface. The handle 4 is short, and the shaft hole 35.3 of the long frame part 32°33
By inserting the support shaft 52 held by the support shaft 9 into the shaft hole 49, the support shaft 52 is rotatably supported by the frame 31. Further, one leg portion 54 of a U-shaped link bottle 53 is inserted into the through hole 50 of the enlarged portion 51, and the free end of the leg portion 64 is connected to the L-shaped sliding window 48 of the long frame portion 33. It is provided so that it can be moved along the arcuate edge 43. Is the other leg δ5 of the link pin 63 attached to the link arm 56? , :Swear @ 5-1.5. shaft hole. □, 6□, God. The large free end is loosely engaged with the sliding window 42 and is movably arranged within the other side. The link arm 56 itself has an inverted U-shaped base 6 that is polished from the end surface.
3, and an access window 64 is formed in the base 63. Furthermore, arm parts 65 and 66 are integrally extended from the front end of the base part 63, extending downward vertically and parallel to each other, and having the above-mentioned ears 5s projecting upward. Shaft holes 6'/6B are bored in the tip portions, respectively. A kick tongue part 69 is bent in an L-shape and slightly inclined upward with respect to the vertical direction, and extends from the lower edge of one arm part, and is bent in an L-shape from the upper edge. Extending is a stop ear 70 which extends substantially horizontally. ! lA shaft hole 67 at the tip of both arm parts 65 and 66
．． Reference numeral 681c holds a support shaft 71, and the support shaft 1 is inserted into the shaft hole 73 of the chevron-shaped movable contactor 2 connected to one end of the detection coil 24 via the lead wire 2B. The movable contactor 72 is pivotally supported to the link arm 56 by this. Above the shaft hole γ3 of the movable contactor 72, an enlarged portion 5 having a locking hole 74 is provided to protrude upward.
A movable contact flow, preferably made of conductive contact material, is fixed to the lower edge of the moonlight end. The movable contact 76 of the movable contact 2 is arranged so as to be able to contact a fixed contact 78, preferably made of a highly conductive material, attached to the fixed contact 1 disposed below the movable contact 2. . The fixed contact 1 itself is a U on which the fixed contact 8 is fixedly installed.
An arc running part 80 extends from one leg of the U-shaped part 79 and extends downward from the other leg of the U-shaped part 9 so as to face the arc traveling ear part 46 of the frame 31. L
Connecting portion 8 bent into a letter shape and integrated with terminal fitting 81
2 has been extended. To further explain the trip mechanism in detail, the shaft hole 36 of the frame 31
, 40, an interlocking arm 04 of the trip mechanism is pivotally supported. The interlocking arm is the safety iron sensor 1
A base 86 with a notch 85 that engages the head @21 of 0
A pair of arm portions 8 and 88 extend perpendicularly and parallel to each other from the front end of the base portion 86, and a support shaft 83 is inserted into shaft holes 89 and 90 formed in each of the arm portions 8 and 88. is inserted, and the interlocking arm 84 is pivotally supported on the frame 31 as described in (9) above. Further, one arm portion 87 is provided with a protruding kick leg portion 91 that is bent into an L shape and extends downward, and is capable of striking the kicking tongue portion 69 of the link arm 56 when the interlocking arm 84 rotates. . In addition, a latch fitting 92 with a polished L-shape is attached to the shaft hole 93 from the side of the support shaft 83 and operates integrally with the interlocking arm 84.
．． G14, one side of the latch metal fitting 92 is provided as an arm portion 95 that can come into contact with the lower surface of the base IB86 of the interlocking arm 84, and the other side extends downward and engages the link arm 56 11I. ! 64 and has a hook 96 that locks on the edge thereof? It is established as. On the other hand, a coil spring 101 is wound around the support shaft 52 of the handle 47.
1 is a semi-circular guard 47aK at the bottom 48 of the handle 4.
While being guided, one end is locked to the corner edge of the sliding window 42, and the other end is locked to the leg side 54 of the U-shaped link pin 53, so that the contact point is always kept with respect to the handle 47. A turning force is applied in the opening operation direction, that is, in the clockwise direction shown in FIG. 2 (10). Also frame 3
One end of the return spring 102 is locked to the locking portion 45 at the tip of the long frame portion 33 of 1, and the return spring 10
The other end of 2 is engaged in the locking hole ff4 of the movable contact 72, and always applies a force to the movable contact 2 in the direction of separating it from the fixed contact 72. Furthermore, an interlocking arm spring 103 and a latch spring 104 are wound around the support shaft 83 of the interlocking arm 84. One end of the interlocking arm spring 103 is attached to the lower surface of the base 86 of the interlocking arm 84, and the other end is attached to the shaft of the frame 31. The locking shaft zosK held in the holes 3'F and 41 is locked [always acting on the interlocking arm 84 in the counterclockwise direction in FIG. 2, that is, in the direction of pulling up the actuating plunger 19. In addition, the latch spring 1
One end of 04 is connected to the locking shaft 105, and the other end is connected to the frame 31.
For example, the latch metal Jl 194 functions to be latched to the link arm 66 in the counter-hour direction in FIG. An arc extinguishing device 110 is disposed between the arc traveling ear portion 46 of the frame 31 and the arc traveling portion eO of the fixed contact 〒7. The arc extinguishing device 110 includes a recess 111 through which the tip of the movable contact 72 can pass, and a large number of de-ion grids 11g spaced apart from each other with small gaps. Further, the group of de-ion grids 112 is held by both side plates 113 and 114, and the side plates 113 and 11 are attached to the edges thereof.
4 and an end plate 115 fixed to the end plate 115 is provided. An arc gas outflow window 116 is formed in the electric plate 115 , and a direct emission prevention plate part 117 is provided at the center of the outflow window 116 at a location corresponding to the recess 111 of the deion grid 112 . - The casing 120 containing all the above-mentioned components consists of two
The divided casing halves 121 and 122 are combined,
The arc extinguishing device 110 is provided so as to partition a housing space, and when each casing half body IJI, 122 is combined, the arc extinguishing device 110
A notch is provided to form a rectangular long hole 123 on one end surface of the side where the is disposed. The elongated hole 123 is located at the back of the direct discharge prevention plate 11 of the arc extinguisher 110. In addition, a handle hole 124 is defined in the upper surface of the handle 120 so that the handle 47 can protrude therefrom and its rotation can be restricted within a predetermined rotation angle. Immediately below the hole 124, a lower portion 48 of the handle 4 is rotatably seated. Also, there is a link arm 1s6 inside the casing 120.
o A protrusion 125 that contacts the stop lug 0 and restricts the rotation range of the link arm 56 is provided, and a prismatic portion 126 that can be fitted with the U-shaped portion 9 of the movable contact 2 protrudes. It is set up. Further, inside the casing IJO, dust portions 12 and 128 are expanded so that the food retention sensor 10 and the arc extinguishing device 110 can be seated securely, respectively. Further, the present invention will be explained in detail. If you are currently in the position shown in Figure 2, Figure 4, or Figure 14, that is, when the knob 4 of the manual opening/closing mechanism is rotated clockwise in the figure, one leg of the cup pin 53 is 64 is located along the arcuate edge 43 of the sliding window 42 at the upper end thereof, and the other leg side 15
5 is located above the other side of the sliding window 42, and the spring force of the return spring 102 is also applied to move the link arm 56 and the opening contact 72 upward. Therefore, the movable contact 76 of the movable contact 2 (13) is separated from the fixed contact 8 of the fixed contact 77, that is, the contact is in an open state. In this case, the link arm 56 is prevented from moving upward more than necessary by the protrusion 125 of the casing. On the other hand, from the position of FIG. 2, FIG. 4, or FIG. 14 to the position of FIG. 5 or FIG. 15, that is, the handle 4
7 is rotated against the spring force of the coil spring 101 and the return spring 101 wound around the two support shafts 52 of the handle.
The position of one leg side 54 of the link pin 53 inserted through the through hole 50 of 1 is aligned with the support shaft 52 of the handle and the link pin 53
When the handle 47 crosses the line connecting the other leg side 55 of the handle 47, the spring forces of the coil spring 101 and the return spring 102 are overcome, and the handle 47 is stopped and held at the counterclockwise rotating position. As a result, one leg side 54 of the link pin 53 reaches the lower part of the arcuate edge of the sliding window 42 and the other leg side 55 reaches the lower part of the other side of the sliding window 42, that is, the link pin 53 reaches the lower part of the arcuate edge of the sliding window 42. The state is close to vertical in the actual drawing, and the hook portion 9 of the latch fitting 92 is attached to the edge of the entry window 64 of the link arm 56.
6 is locked (14), the link arm 56 and the movable contact 2 connected to the link arm 56 via the support shaft 1 move downward and tilt forward, and the movable contact 76 is fixed contact 7
In other words, the contacts are in a closed state. In this case, the electric path is formed by the terminal fitting 29, the detection coil 24, the lead wire 8B, the movable contact 72% moving contact 76, the fixed contact 78, the fixed contact 7F, and the one terminal fitting 81. Furthermore, if an excessive current, for example, a current 1.115 times the rated current, continues to flow when the contacts shown in FIGS. 5 and 15 are closed, first the detection coil 24
The magnetic head 15 is excited through the oil plunger 1.
6 is relatively slowly attracted to the magnetic head 15i while resisting the viscosity of the oil sealed in the coil spring 17 and the lower cylinder body 13. This provides a time delay effect and does not respond to an excessive current flowing for a relatively short period of time, such as a starting current, even if it is detected. When the oil plunger 16 is attracted to the magnetic head 15, the permeance of the magnetic circuit via the yoke 11 increases, and the operating plunger 19, which is always in the upward movement position, moves to the magnetic head as shown in Figure @11. 15 is adsorbed. Accordingly, the interlocking arm 84 and the latch fitting 92 rotate around the support shaft 83, and the hook portion 96 of the latch fitting 92 comes off the edge of the locking window 64 of the link arm 56, and the interlocking occurs as shown in FIG. 16. The kicking leg portion 91 of the arm 84 hits the single tongue portion 69 of the link arm 84. Therefore, this impact strongly applies a so-called starting force to the link arm 56, and the rotational force of the link arm 56 is rapidly increased. The tensile force of 102 is Japanese style, and the first
As shown in FIG. 7, the movable contact 72 is rapidly separated from the fixed contact 77'. At this time, the arc generated when the contact is opened is driven toward the arc extinguishing device 110 by the electromagnetic driving force generated by the current flowing through the fixed contact foot or the movable contact 72, and is extinguished. When the movable contactor 〒2 moves upward, the upper tip of the movable contactor 72 is located very close to the frame 31, and after the contact is opened, the arc traveling ear s4
An electric path can be formed through the frame 31 having the yoke 6 and the yoke 11 that is integrated with the frame 31. Further, the arc gas generated during arc extinguishing is removed from the end plate 11 of the arc extinguishing device 110.
5 can be discharged to the outside through the elongated hole 123 of the casing 120, but the elongated hole 123 is aligned in the longitudinal direction of the casing 120 to prevent direct release to the ejection window 116. Since the plate 11 is attached, the arc gas bypasses the direct release prevention plate 11 without being directly emitted to the outside. Furthermore, when the contacts shown in Fig. 5 and Fig. 15 are closed, if a short circuit current, for example, a current 2.3 times the rated current flows, the detection coil 1 will be activated.
Since the excitation force by 4 is extremely large, only the operating plunger 19 immediately begins to be attracted toward the magnetic head 15, as shown in FIG. At this time, the interlocking arm 84 and the latch fitting 92 are connected to the support shaft 8.
3, the hook part 96 of the latch fitting 92 is removed from the edge of the locking window 64 of the link arm 56, and the 16th
As described above with reference to the drawings, the kicking leg portion 91 of the movable arm 84 strikes the kicking tongue portion 69 of the link arm 84. Therefore, as described above, this impact applies a strong starting force to the link arm 56K, and as shown in FIG. 13, the movable contact foot 2 is rapidly opened and separated from the fixed contact foot. Other actions are the same as when excessive current is detected. According to the circuit breaker of the present invention configured as described above,
The arc gas generated during arc extinguishing flows out from the discharge window of the arc extinguishing device, but at this time, the flow to the elongated hole of the casing is prevented by the direct release prevention plate of the arc gas, and the arc gas bypasses this direct release prevention plate. Since the arc gas reaches the elongated hole, direct release to the outside of the casing is prevented, and gas can be effectively vented from within the casing, which has the effect of suppressing the influence of arc gas on the inside and outside of the circuit breaker.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a circuit breaker according to the present invention, FIG. 2 is a top view of the circuit breaker of FIG. 1 with half of the link (18) removed, and FIG. 1 is an exploded perspective view of the circuit breaker shown above except for the cable/ring, FIG. 4 is a sectional view taken along W-tt in FIG. 1, and FIG. Fig. 6 is a sectional view taken along the vx-tt line in Fig. 2, and Fig. 7 is a sectional view taken along the ■-■ line in Fig. 2. FIG. 8 is a cross-sectional view taken along *-Va@ in FIG. 3. Figure 9 is an end view of the same circuit breaker as above, Figure 10 is a cross-sectional view similar to Figure 6 when excessive current flows through the detection coil of the circuit breaker as above, and Figure 11 is No. 5 with the protection sensor of the same circuit breaker fully activated.
Figure 12 is a cross-sectional view similar to Figure 5, which shows a process of operation of the safety sensor and manual opening/closing mechanism when a short-circuit current flows to the detection circuit of the circuit breaker. 13 is a cross-sectional view similar to that shown in FIG.
Figure 14 is a diagram showing the same state as Figure 2 which simply shows the main components of the circuit breaker shown above, @15 Figure 16 shows the operation when an excessive current flows through the detection coil of the circuit breaker shown above. 11 is a diagram similar to FIG. 14 showing one process of FIG. 14, and FIG. 11 is a diagram similar to FIG. 14 in the same state as FIG. 10...hosen/su, 11...york, 12...
Cylinder, 13... Lower cylinder body, 14... Upper cylinder body, 15... Magnetic head, 16... Oil plunger, 17... Koduru spring, 18...
Lower side part, 19... Operating plunger, 20... Head part, 21... Rod capital, 22... Upper side part, 23...
・Lip part, 24...Detection coil 1, 25.26...Output end % 27...Side part, 28...Lead wire, 29
...Terminal fitting, 31...Frame, 32...Short arm part, 33...Long frame part, 34...Ear part, 3
5.36.37... Shaft hole, 38... Ampulla, 39,
40.41...Shaft hole, 42...Sliding window, 43...
Arc-shaped edge, 44... bending part, 45... locking-146.
・・Arc running ear part, 47・・Handle, 48・・・
Lower part, 49... Shaft hole, 60... Through hole, 51... Ampulla, 52... Support shaft, 53... Link pier, 54.
55... Leg side portion, 56... Link arm, 5/, 5
8...Ear part, 61.62...Shaft hole, 63...Base, 64...Intrusion window, 65.66...Arm part, 67.68...Shaft hole, 69...・Kicking tongue 1s%
'10...Stop ear part, 71...Spindle, F2...
・Movable contact, 3...shaft hole, 74...locking hole, 7
3... Ampulla part, Flo... Movable contact Fufu... Fixed contact, Fu 8... Fixed contact, Fu 9... U-shaped part, 80
...Arc running plate, 81...Terminal fitting% 82...
・Connection part, 83... Support shaft, 84... Interlocking arm, 8
5... Notch, 86... Base, s'1. BB... Arm part, 89.90... Shaft hole, 91... Ribbed foot part, 92... Latch fitting, 93.94... Shaft hole, 9
5...Arm part, 96...Pull 1) part, 97...
・ff[% 101...Kol1rusufuri/g, 102・
...Return spring, 103...Interlocking arm spring, 104...Latch spring, 105...
Mounting shaft, 106... Round hole, 11O... Arc extinguishing device, 1
11...Concavity, 112...Dare 1 onogrid, 1
13,114...Side plate, 115...End plate, 116.
... Outflow window, 11) ... Direct release prevention plate, 120...
Casing, 121.1211...Casing half,
123...Long hole, 124...Handle hole, 125...
...Protrusion g, 126 square column part, 127,128...Pedestal part (21) 22 +1 Back -m-1m-' Fig. 3

Claims (1)

[Scope of Claim] A casing, and a handle that partially protrudes from the casing and is rotatably held by the casing. It includes a link member linked to the handle and a trip mechanism that can be engaged and detached from the link member, and has a manual opening/closing mechanism that can be operated via the handle, and a movable contact that can be swung by the manual opening/closing mechanism. a fixed contact having a fixed contact through which the movable contact of the movable contact is brought into and out of contact with the fixed contact; a return spring that acts to separate the movable contact from the fixed contact; An arc extinguishing device comprising: an arc extinguishing device disposed near a contact point of a contact; and a retention sensor that is driven via a detection coil that detects overcurrent and moves the trip mechanism in a direction to separate it from a link member. is equipped with an arc gas discharge window, an arc gas direct discharge prevention plate is attached to the discharge window, and a long hole is bored in the casing opposite to the direct discharge prevention plate! A circuit breaker with an image.