JPH0253902B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a de-ion switch which can also be used as a switch with an ordinary arc extinguishing device by stopping the operation of the trip mechanism of a circuit breaker. be.

[Background Art] Conventionally, a de-ion switch (also referred to as an isolating switch or a non-trip breaker) equipped with an arc extinguishing device has been generally used as a switch for interrupting a relatively large current circuit. However, if a dedicated production line was provided to manufacture such de-ion switches, there was a problem in that the production cost would increase significantly.
Therefore, users are using a general circuit breaker with an arc extinguishing device instead of a de-ion switch. This is inconvenient when used in a power system where a large current flows momentarily, for example. Attempts have also been made to modify circuit breakers with arc extinguishing devices to stop their trip mechanism and enable them to be used as de-ion switches; however, in conventional circuit breakers, the casing is Only an arc gas exhaust hole is provided, and the other parts are completely blocked off, so it is impossible to stop the trip mechanism by external operation, and the circuit breaker cannot be used. There was a problem in that it was time-consuming to remodel as it required disassembly to remove the internal overcurrent element or change other mechanisms.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and it is possible to control the movement of a mechanical member used for the tripping operation of a normal circuit breaker by using a stopper that can be inserted arbitrarily from the outside. It is an object of the present invention to provide a de-ion switch which can be used as a switch equipped with an arc extinguishing device by allowing a circuit breaker manufactured in a normal circuit breaker manufacturing line to be used as a switch equipped with an arc extinguishing device.

[Disclosure of the Invention] The configuration of the present invention will be described below with reference to illustrated embodiments. FIG. 1 is a longitudinal cross-sectional view that best shows the characteristics of a de-ion switch according to an embodiment of the present invention, and FIG. 2 is a side view showing the main parts thereof. As shown in the above figures, the present invention is a conventional circuit breaker B.
A through hole 1 is provided in the side wall surface of the switch, and a stopper 2 is inserted through the through hole 1 to prevent the latch plate 3 for trip operation from moving so that the switch can be used as a normal de-ion switch. It has characteristics. That is, in the present invention, when manufacturing a circuit breaker, a stopper 2 for preventing the movement of the latch plate 3 can be inserted in advance at a portion corresponding to the location where the latch plate 3 for tripping operation is provided. A through hole 1 having the shape of the above is formed in the casing 4, and when used as a circuit breaker, the stopper 2 is not inserted into the through hole 1.
When used as a de-ion switch, a stopper 2 is inserted to prevent the latch plate 3 from moving. FIG. 3 is a perspective view showing the appearance of the stopper 2, and FIG. 4 is a perspective view showing the appearance of the de-ion switch with the stopper 2 completely inserted. As shown in FIG. 4, the stopper 2
After the through hole 1 is inserted, the through hole 1 is closed by attaching a side plate 5 made of an insulating material. In the present invention, by selecting whether or not to insert the stopper 2 in this way, a circuit breaker produced in the same manufacturing process can be used as a deion switch that does not perform a tripping operation, or as a normal deion switch. It can also be used as a circuit breaker. Therefore, in the present invention, there is no need to provide a separate manufacturing line for the de-ion switch, which is a separate process different from that for ordinary circuit breakers, and in the present invention, the casing 4 of the circuit breaker does not need to be provided separately. The tripping function can be removed simply by inserting the stopper 2 into the through-hole 1 provided in the circuit breaker, so unlike conventional circuit breakers, it is not necessary to disassemble the circuit breaker and remove the overcurrent element or change other internal mechanisms. Since there is no need to do anything like this, modification to a de-ion switch becomes extremely easy.

The detailed structure of the embodiment shown in FIGS. 1 to 10 will be described below. The outer casing of the circuit breaker B used in this embodiment consists of a pair of casings 4
₁ , 4 ₂ with a fixing device such as a screw or rivet 2
A handle 6 for opening and closing the circuit is provided protruding from the upper surface of the circuit breaker body. FIG. 5 shows the state in which the fixture 21 has been removed and one casing 4 ₁ has been removed from the other casing 4 ₂ . As shown in the figure, there is a pair of casings 4 ₁ and 4 ₂ between them. Various parts such as external connection terminals 22 ₁ and 22 ₂ , a movable contactor 7, and an arc extinguisher 13 are housed therein. 6 and 7 individually show the parts required for the operation of this embodiment, and FIGS. 8 to 10 show the cross-sectional structure of the circuit breaker used in this embodiment. There is. However, since FIG. 10 shows the state of the circuit breaker itself when it is tripped without the stopper 2, the stopper 2 is not drawn. Also in the other drawings, in the following description, the structure and operation of the circuit breaker itself will be mainly described without the stopper 2. In each of the above figures, 8 is a movable contact attached to the tip of the movable contact 7, and is designed to open and close the main circuit by contacting and separating from the fixed contact 9 attached to one terminal plate ₂₃₁ . It's getting old. A tightening screw 26 is attached to each terminal plate 23 ₁ , 23 ₂ via a washer 24 and a spring washer 25 , thereby forming a pair of external connection terminals 22 ₁ , 22 ₂ . The protrusion 27 protruding from the terminal plate 23 ₂ has an engagement hole 11a for the bimetal 11 for overcurrent detection.
is inserted and the projecting piece 27 is caulked, so that the bimetal 11 is fixed to the terminal plate ₂₃₂ . One end of the braided wire 28 is welded to the free end side of the bimetal 11, and the other end of the braided wire 28 is welded to the movable contact 7. The movable contact 7 is caulked to a movable arm 29, and this movable arm 29 is connected to the movable frame 3.
It is designed to be inserted into the bottom opening of 0.
Reference numeral 31 denotes a rotating shaft for pivotally supporting the handle 6, movable arm 29, and movable frame 30, and the central portion of this rotating shaft 31 is bent into a substantially U-shape and is fitted into a groove 6a in the handle 6. It's starting to match. Further, both ends of the rotating shaft 31 are fitted into a U-shaped groove 32 that serves as a pivot point of the movable arm 29, and a pivot hole 33 of the movable frame 30 and a U-shaped groove 34.
It is designed to be mated to. 35 is a tension spring for urging the handle 6 to the on position and the off position. One end of the tension spring 35 is engaged with the center of the rotating shaft 31, and the other end is engaged with a pin 37 whose both ends are supported in the shaft hole 36 of the movable arm 29. The handle 6 is therefore supported by the tension spring 3 as shown in FIGS. 1 and 9.
5 crosses the rotation center P of the rotating shaft 31, and is biased toward the on position or the off position. Furthermore, the movable arm 29, the movable frame 30, and the rotating shaft 31 can be integrated by the tensile force of the tension spring 35. Therefore, a protrusion 38 is provided at one end of the movable frame 30.
is formed, and the concave groove 6b of the handle 6 can be engaged with the protrusion 38 as shown in FIG. 6 from flying out in the direction shown by arrow A. Next, reference numeral 10 is a compression coil type spring for forcibly opening the movable contactor 7 during the tripping operation, and the tip of this spring 10 is connected to the spring of the movable frame 30 via a protective plate 39 for preventing arcing. It is adapted to be inserted into and engaged with an engagement hole 40a provided in the seat 40. Also, the above spring 10
is housed in the storage space 41 of both casings 4 ₁ and 4 ₂ , and the rear end of the spring 10 comes into contact with the inner bottom surface 42 of the space 41 . The arc protection plate 39 prevents the spring 10 from being melted and damaged by the arc generated when the movable contact 8 of the movable contact 7 separates from the fixed contact 9 of the terminal plate 23 ₁ , and serves as a front protection. It is composed of a plate 39a and a side protection plate 39b. Further, the front protection plate 39a is provided with a fitting hole 39c into which the tip of the spring 10 is fitted. The front protection plate 39a and the spring seat 40 of the movable frame 30 are formed to be slightly inclined in order to improve contact with the spring 10. Reference numeral 43 denotes a yoke plate for short-circuit current detection formed of a magnetic material, and side protruding pieces 44 protruding from this yoke plate 43 are engaged with each other formed on the pair of casings 4 ₁ and 4 ₂ . It is designed to be fixed by a hole 45. The center piece 46 of the yoke plate 43 is connected to the terminal plate 23
₂ , and side pieces 4 forming a magnetic path are attached from both sides of the central piece 46.
7 extends vertically. 3 is a latch plate, and a pivot pin 49 is inserted into the pivot hole 48 of the latch plate.
Both ends of the latch plate 3 are supported by the engagement holes 50 of the casings 4 ₁ and 4 ₂ , making the latch plate 3 rotatable. This latch plate 3 is made of a magnetic material, and when an excessive current flows through the bimetal 11,
The magnetic flux generated around the bimetal 11 flows to the center piece 46 and side pieces 47 of the yoke plate 43, so that the magnetic attraction piece 51 of the latch plate 3 is attracted to the side piece 47. Further, an abutment piece 52 is formed at the upper end of the latch plate 3, and is adapted to abut against the free end side of the bimetal 11.
A locking stepped portion 54 is formed at the tip of each side piece 53 of the latch plate 3, and is adapted to abut against a locking portion 55 of the movable frame 30. Reference numeral 56 denotes a torsion spring that presses the contact piece 52 of the latch plate 3 toward the free end side of the bimetal 11, and as shown in FIGS. The other end contacts the handle 6 when the handle 6 is in the OFF position, and contacts the casings 4 ₁ and 4 ₂ when the handle 6 is in the ON position. It changes the force applied. The torsion spring 56 is pivoted by being fitted into the pivot boss 57 ₁ of the casing 4 ₁ on the one hand, and received by the pivot boss 57 ₂ of the casing 4 ₂ on the other hand. Both casings 4 ₁ and 4 ₂ also have a rotating shaft 31
A shaft support hole 58 for supporting both ends of the support hole 58, a hole 59 for inserting the fixture 11, and exhaust holes 60a and 60 for exhausting gas generated when the circuit is interrupted.
b etc. are provided. Furthermore, 13 is an arc extinguishing device, which is formed by holding a plurality of arc extinguishing plates 14 made of magnetic material at appropriate intervals by side plates 15 made of insulating material, and has movable contacts 8
The arc generated when the fixed contact 9 and the fixed contact 9 are opened can be extinguished as quickly as possible.
Each arc extinguishing plate 14 is provided with a notch 14a through which the movable contact 7 can pass. At the lower end of this cutout 14a, a substantially V-shaped cut groove 14b is provided to discharge the gas accumulated around the contact to a gas retention part 61 formed behind the fixed contact 9, thereby improving the breaking performance. It's something we're used to getting.
Also, an arc extinguishing chamber 16 that stores the arc extinguishing device 13,
A partition wall 63 is formed between the spring 10, the movable frame 30, etc., and the interrupting mechanism chamber 62 to prevent the arc from the arc extinguishing chamber 16 from entering the interrupting mechanism chamber 62. It is.

Next, the operation of the circuit breaker used in this embodiment will be explained with reference to the accompanying drawings. First, FIG. 1 shows a state in which the circuit breaker is off, and in this state, the movable contact 8 and the fixed contact 9 are separated. At this time, the movable contact 7 is urged by the tensile force of the tension spring 35 and is separated to a position where it abuts the opening edge of the bottom opening of the movable frame 30.
Further, the handle 6 is similarly biased by the tensile force of the tension spring 35, and is stopped at a position where the groove 6b engages with the protrusion 38. Further, since one end of the torsion spring 56 is pressed by the outer peripheral surface of the handle 6, the other end of the torsion spring 56 strongly presses the back side of the abutment piece 52 of the latch plate 3. Therefore, the locking portion 55 of the movable frame 30 is reliably engaged with the locking step portion 54 of the latch plate 3. Further, due to this engagement, the spring 10 for tripping operation remains compressed in the storage space 41. Figure 8 is the first
The figure shows a cross-sectional view taken along line X-X in the figure, and if you look at the figure, you can clearly see how the central part 31a of the rotating shaft 31 and the pin 37 of the movable arm 29 are pulled together by the tension spring 35. can. Next, FIG. 9 shows a state in which the circuit breaker is turned on. In this state, the movable contact 7 is urged by the tensile force of the tension spring 35, and the movable contact 8 is pressed against the fixed contact 9. It is stopped at the position. Further, the handle 6 is similarly biased by the tensile force of the tension spring 35, and is stopped at the position where the operating portion of the handle 6 is in contact with the casing 4. In this way, the direction in which the movable contactor 7 and the operation part of the handle 6 are biased is such that the tension spring 35 is
It is designed to reverse at the point where it crosses the boundary. Therefore, when the circuit breaker is on, the torsion spring 56 is activated as shown in FIG.
Since one end is no longer pressed against the outer circumferential surface of the handle 6, the pressing force at the other end of the torsion spring 56 is weaker than in the off state, and the desired force is applied to the contact piece 52. ing. Therefore, if the bimetal 11 heats up and deforms due to overcurrent and presses against the abutting piece 52 of the latch plate 3, or if the yoke plate 43 is magnetized by the short-circuit current flowing through the bimetal 11, the magnetic attraction piece 51 When the latch plate 3 is sucked, the latch plate 3 rotates around the pivot pin 49, thereby disengaging the locking step portion 54 and the locking portion 55, and the spring 10 extends, and the movable frame 30 rotates about the rotation center P of the rotating shaft 31. 1st
Figure 0 shows a state in which such a tripping operation is performed, and as shown in the figure, the movable frame 30 is pressed by the spring 10 and rotates.
The movable contact 7 is pushed by the opening edge of the bottom opening of the movable frame 30 and is forcibly driven in the contact opening direction. When the movable contact 7 is opened by a predetermined distance, the tension force of the tension spring 35 further drives the movable contact in the contact opening direction, and finally the movable arm 29 comes into contact with the pivot pin 49, and the movable arm 29 The handle 6 is stopped at a position where the groove 6b is engaged with the protrusion 38 of the movable frame 30. At this time, since the movable frame 30 is tilted, the operating portion of the handle 6 stops approximately at the center between the on position and the off position, indicating that a trip operation has been performed. When such a tripping operation is performed, unless the handle 6 is returned to the OFF position and the engagement between the locking step 54 and the locking portion 55 is restored as shown in FIG. 1, the handle 6 will remain in the ON position. It cannot be stopped. As is clear from a comparison between FIG. 1 and FIG. 9, the opening width of the bottom opening of the movable frame 30 is longer than the opening/closing stroke of the movable contact 7, so that manual opening/closing operation is not possible. When the tripping operation is not performed as in the case of the present invention, the movable contactor 7 is not affected by the tripping mechanism such as the spring 10, the movable frame 30, and the latch plate 3. Therefore, even when the stopper 2 is inserted and used as a de-ion switch, the opening/closing operation of the switch is not affected by the trip mechanism at all. When the movable contact 8 and the fixed contact 9 are opened and the main circuit is interrupted, an arc is generated between the movable contact 8 and the fixed contact 9. The arc is extinguished as quickly as possible by the arc extinguishing plates 14. As described above, a substantially V-shaped groove 14b is formed at the lower end of the notch 14a of the arc-extinguishing plate 14, and this groove 14b is located below the terminal plate ₂₃₁ as shown in FIG. It is arranged. Therefore, the gas generated around the contact when the circuit is interrupted is quickly discharged to the gas retention portion 61 at the rear of the terminal plate 23 ₁ through the cut groove 14a. Furthermore, since the gas discharged into the gas retention section 61 is discharged from the exhaust hole 60a, the amount of arc ejected to the outside can be reduced. In addition to this exhaust hole 60a, the arc extinguishing device 13
An exhaust hole 60b is also provided on the opposite side of the arc extinguisher 16, and gas is discharged in both directions, thereby increasing the efficiency of gas discharge from the arc extinguishing device 16.

FIG. 11 is a perspective view showing the appearance of a de-ion switch according to another embodiment of the present invention. As shown in the figure, in the de-ion switch according to this embodiment, the single-pole type circuit breaker shown in the previous embodiment is changed to a triple type so that three-phase AC can be opened and closed simultaneously. This is what I did. FIG. 12 is an exploded perspective view of the triple deion switch shown in FIG. 11. As shown in FIG. 12, in the triple deion switch, a stopper made of a long plate 70 is shared by three single-pole circuit breakers B. . An interlocking cap 71 is attached to the handle 6 of each single-pole circuit breaker B, and an interlocking pin 72 is fitted into an insertion hole 73 provided at the upper end of the handle 6. Further, each single-pole type circuit breaker is fixed by a relatively long fixture 21. The through hole 1 provided in the casing 4 of each circuit breaker is closed by a side plate 5 made of an insulating material after the elongated plate 70 is inserted therein. In this embodiment, instead of the long plate 70, a stopper 2 made of a relatively short plate as shown in the first embodiment may be provided behind the latch plate 3 of each circuit breaker. It doesn't matter.

[Effects of the Invention] The present invention is configured as described above, and a through hole is provided in a portion of the casing of a circuit breaker having a trip mechanism that corresponds to the location where the trip mechanism is provided. The trip mechanism is locked by a stopper inserted through the circuit breaker, so by selecting whether or not to insert the stopper, circuit breakers produced in the same manufacturing process can be locked to trip operation. It can be used both as a de-ion switch that does not perform circuit breaker or as a normal circuit breaker. Therefore, in the present invention, a separate manufacturing line for de-ion switches is used, which is different from that for normal circuit breakers. There is an advantage that there is no need to provide a separate stopper for the circuit breaker, and in the case of the present invention, the tripping function can be removed simply by inserting the stopper from the outside into the through hole provided in the casing of the circuit breaker. , there is no need to disassemble the circuit breaker and remove the overcurrent element or change other internal mechanisms as in the past, making it extremely easy to convert a circuit breaker into a de-ion switch. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a de-ion switch according to an embodiment of the present invention when it is turned off, FIG. 2 is a side view showing the main parts thereof, and FIG. 3 is a perspective view showing the appearance of a stopper used in the same. Fig. 4 is a perspective view showing the external appearance of the deion switch with the stopper inserted, Fig. 5 is a perspective view showing the casing of the circuit breaker used in the above, with the casing open, and Figs. 6 and 7 are the same as the above. 8 is an exploded perspective view showing individual components used in the circuit breaker, FIG. 8 is a sectional view taken along the line X-X of FIG. 1, FIG. 9 is a longitudinal sectional view of the same circuit breaker when it is on, and FIG. 11 is a perspective view showing the external appearance of a de-ion switch according to another embodiment of the present invention, and FIG. 12 is an exploded perspective view of the same. 1 is a through hole, 2 is a stopper, 3 is a latch plate, 4
is a casing, 6 is a handle, 7 is a movable contact,
8 is a movable contact, 9 is a fixed contact, 10 is a spring, 11 is a bimetal, 12 is a latch plate, and 13 is an arc extinguishing device.

Claims (1)

[Claims] 1. A movable contact that opens and closes when the handle is rotated, a fixed contact that comes into contact with and releases the movable contact of the movable contact, and a movable contact that is attached in the direction in which the contact between the movable contact and the fixed contact is released. a spring mechanism that applies pressure, a load abnormality detection mechanism that responds to load abnormalities,
Normally, it is in the latching position where the spring mechanism is latched so that the biasing force of the spring mechanism is not applied to the movable contact, and when the load abnormality detection mechanism detects an abnormality in the load, it moves to the tripping position where the latching operation is released. The casing includes a trip mechanism for opening the contact and an arc extinguishing device for extinguishing the arc generated when the two contacts are opened.
A circuit breaker comprising a through hole for multi-pole connection in a portion of the casing corresponding to the trip mechanism, characterized in that the movement of the trip mechanism is locked by a stopper inserted through the through hole. Deion switch.