CN109509692B - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
- Publication number
- CN109509692B CN109509692B CN201810372049.8A CN201810372049A CN109509692B CN 109509692 B CN109509692 B CN 109509692B CN 201810372049 A CN201810372049 A CN 201810372049A CN 109509692 B CN109509692 B CN 109509692B
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- China
- Prior art keywords
- circuit breaker
- engaging portion
- trip
- opening
- closing mechanism
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- 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
- H01H73/18—Means for extinguishing or suppressing arc
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- 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
- H01H71/10—Operating or release mechanisms
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
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- 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
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Abstract
The opening and closing mechanism part of the circuit breaker comprises: a trip bar (17) which rotates around a rotating shaft (17c) by the action of the trip mechanism part and has an arc-shaped engaging part (17b) along the rotating direction of the rotating shaft (17 c); and a rod part (16) which is a state holding member having a planar engaging part (16d) that engages with the arc-shaped engaging part (17 b). The trip bar (17) can be changed to the following posture by rotating around a rotating shaft (17 c): the arc-shaped engagement part (17b) is engaged with the plane-shaped engagement part (16d) to set the opening and closing mechanism part to be in a non-tripping state; and an arc-shaped engaging portion (17b) and a planar engaging portion (16d) are disengaged, and the opening/closing mechanism portion is set to a disengaged state. The planar engaging portion (16d) has a convex portion (16e) protruding toward the arc-shaped engaging portion (17 b).
Description
Technical Field
The present invention relates to a circuit breaker having an opening/closing mechanism portion that is operated to be tripped by an operation of a trip mechanism portion.
Background
Conventionally, as the types of trip mechanism portions of circuit breakers, there are known a thermal electromagnetic type and a complete electromagnetic type. As described in patent document 1, the thermally-actuated electromagnetic trip mechanism unit guides the trip operation of the opening/closing mechanism unit by rotating the trip bar of the opening/closing mechanism unit by the thermal bending amount of the bimetal. As described in patent document 2, the fully electromagnetic trip mechanism unit rotates the trip bar of the opening/closing mechanism unit by the urging force of the magnetically attracted iron piece to guide the tripping operation of the opening/closing mechanism unit.
Patent document 1: japanese laid-open patent publication No. 58-131625
Patent document 2: japanese patent laid-open publication No. 2011-171223
The completely electromagnetic trip mechanism portion and the thermal electromagnetic trip mechanism portion are limited in terms of the external dimensions and heat generation of the circuit breaker. Therefore, it is desirable that the force required to guide the trip operation of the opening/closing mechanism portion by the trip mechanism portion, i.e., the required operation force, be small.
However, if the required operating force is too small, the opening/closing mechanism unit may be caused to perform the trip operation when the trip operation is not required due to disturbance such as vibration or impact. Therefore, it is desirable to reduce the fluctuation of the required operating force so as to converge to a range in which the opening/closing mechanism section does not trip due to disturbance when the trip operation is not required.
The trip bar is engaged with a state holding member such as a lever that maintains the opening/closing mechanism section in a non-tripped state, and the trip bar is rotated to release the engagement, thereby guiding the tripping operation of the opening/closing mechanism section. Therefore, it is considered that the fluctuation of the required operating force is reduced by forming the trip bar in an arc shape with respect to the contact surface of the state holding member that maintains the opening/closing mechanism section in the non-tripped state. Further, when a deformed portion such as a convex portion is generated on the contact surface of the trip bar due to molding failure, fluctuation of required operation force becomes large, and the trip operation may become unstable.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to obtain a circuit breaker capable of stabilizing a trip operation.
In order to solve the above problems and achieve the object, a circuit breaker according to the present invention includes: a fixed contact having a fixed contact point; a movable contact having a movable contact opposed to the fixed contact; an opening/closing mechanism section for making and breaking contact between the fixed contact and the movable contact; and a trip mechanism unit that sets the opening/closing mechanism unit to a tripped state. The opening/closing mechanism section includes: a trip bar which rotates around the rotating shaft by the action of the trip mechanism part and has an arc-shaped clamping part along the rotating direction of the rotating shaft; and a state holding member having a planar engaging portion that engages with the arcuate engaging portion. The trip bar can be changed to the following attitude by rotating about the rotation axis: the arc-shaped clamping part is clamped with the plane-shaped clamping part to set the opening and closing mechanism part to be in a non-tripping state; and the engagement between the arc-shaped engagement portion and the planar engagement portion is released, and the opening/closing mechanism portion is set to the disengaged state. The planar engaging portion has a convex portion protruding toward the arc-shaped engaging portion.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the effect of stabilizing the trip operation can be achieved.
Drawings
Fig. 1 is a side sectional view showing an internal structure of a circuit breaker in an on state according to embodiment 1.
Fig. 2 is a side sectional view showing an internal structure of the circuit breaker in an open state according to embodiment 1.
Fig. 3 is an explanatory diagram of an opening and closing mechanism unit in the circuit breaker according to embodiment 1.
Fig. 4 is an external perspective view of a lever in the circuit breaker according to embodiment 1.
Fig. 5 is a diagram showing a case where the movement direction of the roller is regulated by the lever in the circuit breaker according to embodiment 1.
Fig. 6 is a diagram showing a relationship between an engagement portion of a lever and an engagement portion of a trip bar in the circuit breaker according to embodiment 1.
Fig. 7 is a side sectional view showing an internal configuration of the circuit breaker in the tripped state according to embodiment 1.
Fig. 8 is a diagram showing a relationship between an engaging portion of a lever and an engaging portion of a trip bar in a trip operation of the circuit breaker according to embodiment 1.
Fig. 9 is a side view of a lever according to embodiment 2.
Fig. 10 is a rear view of the lever according to embodiment 2.
Fig. 11 is a side view of a lever according to embodiment 3.
Fig. 12 is a rear view of the lever according to embodiment 3.
Description of the reference numerals
1 frame, 2 fixed contact, 2A fixed contact, 3 movable contact, 3a movable contact, 4 separated spring, 5 fixed conductor, 10 open/close mechanism part, 11 frame, 12 operation handle, 12A, 15c, 17c, 21a, 31c rotation axis, 12B, 31a, 31B installation hole, 12d protrusion, 13 pressing plate, 14 roller, 15 link, 16A, 16B rod part, 16A, 16B, 21d, 31e bearing hole, 16c contact part, 16d, 17B, 66d, 76d engagement part, 16e, 66e, 76e protrusion, 16f handle engagement surface, 17 trip strip, 17a main body part, 17d contact surface, 17f special shape part, 18 torsion spring, 201 frame, 21, 31, 162A, 162B flat plate part, 22, 23, 32, protrusion part, 24, 33, 30 second frame, 31f opening part, 50 trip mechanism portion, 51 iron core, 52 electromagnetic coil, 53 bobbin, 54 armature, 60 area, 66f recess, 100 circuit breaker, 151, 541 one end portion, 152, 543 another end portion, 161 base end portion, 542 central portion.
Detailed Description
Hereinafter, a circuit breaker according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the present embodiment. For convenience of explanation, the XYZ axes are indicated in the drawings. In the XYZ-axis coordinates, the Z-axis positive direction is set to the up direction, the Z-axis negative direction is set to the down direction, the X-axis positive direction is set to the right direction, the X-axis negative direction is set to the left direction, the Y-axis positive direction is set to the front direction, and the Y-axis negative direction is set to the back direction.
Embodiment 1.
Fig. 1 is a side sectional view showing an internal structure of a circuit breaker in an on state according to embodiment 1, and fig. 2 is a side sectional view showing an internal structure of a circuit breaker in an off state according to embodiment 1. The circuit breaker 100 according to embodiment 1 is a wiring breaker that detects an overcurrent or a short-circuit current and breaks the circuit, but may be an earth leakage breaker that detects an earth leakage and breaks the circuit.
When the circuit breaker 100 is in the on state, the circuit breaker 100 closes the circuit and causes a current to flow through the circuit. When the circuit breaker 100 is in the off state, the circuit is opened by the circuit breaker 100, and the current of the circuit is interrupted.
As shown in fig. 1 and 2, a circuit breaker 100 according to embodiment 1 includes: an insulating frame 1; a fixed contact 2 having a fixed contact 2a at one end; a movable contact 3 provided with a movable contact 3a opposed to the fixed contact 2 a; a separation spring 4 that biases the movable contact 3 in a direction of separating from the fixed contact 2; and a fixed conductor 5 connected to a load side conductor, not shown. A power supply side conductor, not shown, is connected to the other end of the fixed contact 2.
In addition, the circuit breaker 100 includes: an opening/closing mechanism section 10 that contacts and separates the fixed contact 2a and the movable contact 3 a; and a trip mechanism unit 50 that causes the opening/closing mechanism unit 10 to perform a trip operation when a current abnormality such as an overcurrent or a short-circuit current is detected.
The opening/closing mechanism section 10 includes: a frame 11 fixed to the frame 1; an operation handle 12 which is rotatably attached to the frame 11 and is manually operated from the outside; an insulating pressing plate 13 which is movable in the vertical direction along a groove, not shown, formed in the housing 1 in a state of being engaged with the movable contact 3; a roller 14 engaged with an upper portion of the pressing plate 13; and a link 15 having one end 151 rotatably attached to the attachment hole 12b of the operation handle 12 and the other end 152 rotatably supporting the roller 14.
The opening/closing mechanism section 10 further includes: a lever portion 16 that restricts the movement direction of the roller 14 to the vertical direction along the direction in which the roller 14 presses the pressing plate 13; a trip bar 17 that releases the restriction of the movement direction of the roller 14 by the lever portion 16; and a torsion spring 18 that pretensions the lever portion 16 and the trip bar 17. The lever portion 16 is an example of a state holding member that holds the opening/closing mechanism portion 10 in the non-release state. The state holding member may be a member other than the lever 16 as long as it can hold the opening/closing mechanism section 10 in the non-release state.
When the circuit breaker 100 is in the on state, as shown in fig. 1, the pressing plate 13 is pressed by the roller 14 against the biasing force of the separation spring 4, and the fixed contact 2a and the movable contact 3a are in contact with each other. When the circuit breaker 100 is in the off state, as shown in fig. 2, the roller 14 is pushed up by the pressing plate 13 due to the biasing force of the separation spring 4, and the fixed contact 2a and the movable contact 3a are separated from each other.
The trip mechanism portion 50 includes: a core 51; a cylindrical electromagnetic coil 52 fixed to the core 51; an insulating bobbin 53 around which the electromagnetic coil 52 is wound; and an armature 54 that moves by magnetic force generated in the core 51 by the action of magnetic flux of the electromagnetic coil 52. The armature 54 is formed of a magnet such as iron and an alloy.
Here, an operation when the circuit breaker 100 is switched from the off state to the on state will be described. In the circuit breaker 100, if the operation handle 12 is pushed forward from the open state shown in fig. 2, the operation handle 12 rotates about the rotation shaft 12 a. The one end 151 of the link 15 inserted into the mounting hole 12b is moved rearward by the rotation of the operating handle 12, and the roller 14 connected to the other end 152 of the link 15 is moved downward by the rod 16 while the movement direction is restricted, and the pressing plate 13 is pressed downward along the side surface of the rod 16.
When the pressing plate 13 moves downward, the movable contact 3 engaged with the pressing plate 13 moves downward while receiving a reaction force from the separation spring 4. Thereby, the movable contact 3a comes into contact with the fixed contact 2a, and the circuit breaker 100 is brought into the on state shown in fig. 1.
In the state after the circuit breaker 100 is switched to the on state, the one end 151 of the link 15 is located rearward of a straight line passing through the center of the rotation shaft 12a and the center of the roller 14, and therefore a force directed upward from the roller 14 via the link 15 is applied to the one end 151 of the link 15. Thus, the operating handle 12 is stopped at the position shown in fig. 1, i.e., the on position.
Next, an operation when the circuit breaker 100 is switched from the on state to the off state will be described. In the circuit breaker 100, if the operation handle 12 is pushed rearward from the closed state shown in fig. 1, the center of the rotation shaft 12a, the center of the one end 151 of the link 15, and the center of the roller 14 are aligned in the process of rotating the operation handle 12 about the rotation shaft 12 a. Therefore, the movable contact 3 is pressed by the force from the roller 14, and the force required to move the operation handle 12 increases.
When the operation handle 12 is further rotated and the one end 151 of the link 15 moves forward, the pressing plate 13, which receives the reaction force from the separation spring 4, presses the roller 14 and the other end 152 of the link 15 upward. Therefore, the operation handle 12 continues to rotate backward, the one end 151 of the link 15 mechanically moves forward, and the roller 14 attached to the link 15 moves upward.
Accordingly, the pressing plate 13 and the movable contact 3 are also moved to the position of the open state by the operation opposite to the operation from the open state to the closed state, the movable contact 3a and the fixed contact 2a are separated, and the circuit breaker 100 is brought into the open state shown in fig. 2.
Here, the structure of the opening/closing mechanism 10 will be specifically described. Fig. 3 is an explanatory diagram of an opening and closing mechanism unit in the circuit breaker according to embodiment 1. The frame 11 includes: the 1 st frame 20 and the 2 nd frame 30 shown in fig. 3. The 1 st frame 20 and the 2 nd frame 30 are formed by subjecting a plate-like member such as a metal plate to a process including a punching process, a forging process, and a bending process, and are fixed to the housing 1.
The 1 st frame 20 has: a flat plate-like portion 21; projections 22, 23 projecting from the flat plate-like portion 21 in a direction opposite to the 2 nd frame 30; and a fixing portion 24 fixed to the housing 1. The flat plate-like portion 21 and the projecting portions 22 and 23 form an コ -shaped portion in a plan view. The 2 nd frame 30 has: a flat plate-like portion 31; a projection 32 projecting from the flat plate-like portion 31 in a direction opposite to the 1 st frame 20; and a fixing portion 33 fixed to the housing 1. The flat plate portion 31 and the projecting portion 32 form an L-shaped portion in a plan view.
A rotation shaft 21a is formed in the 1 st frame 20 to protrude in a direction opposite to the 2 nd frame 30. A rotation shaft 31c protruding in a direction opposite to the 1 st frame 20 is formed in the 2 nd frame 30. The rotation shaft 21a is formed by pressing a part of the flat plate-shaped portion 21, and the rotation shaft 31c is formed by pressing a part of the flat plate-shaped portion 31.
As shown in fig. 3, the stem portion 16 includes: a bearing hole 16a into which the rotating shaft 21a is inserted; and a bearing hole 16b into which the rotation shaft 31c is inserted. The frame 11 of the lever portion 16 is rotatably supported by inserting the rotating shaft 21a into the bearing hole 16a and inserting the rotating shaft 31c into the bearing hole 16 b.
Further, a bearing hole 21b is formed in the flat plate-shaped portion 21 of the 1 st frame 20, and a bearing hole 31d is formed in the flat plate-shaped portion 31 of the 2 nd frame 30. The operation handle 12 is formed with a rotation shaft 12a, and the rotation shaft 12a is inserted into the bearing holes 21b and 31d, whereby the operation handle 12 is supported rotatably about the rotation shaft 12a on the frame 11.
A bearing hole 21d is formed in the flat plate-shaped portion 21 of the 1 st frame 20, and a bearing hole 31e is formed in the flat plate-shaped portion 31 of the 2 nd frame 30. The trip strip 17 has: a main body 17a on which a biasing force generated by the trip mechanism 50 acts; a planar engaging portion 17b that engages with an arc-shaped engaging portion 16d formed on the lever portion 16; and a rotation shaft 17c provided between the main body 17a and the engagement portion 17 b. The rotation shaft 17c is inserted into the bearing holes 21d and 31e, and the trip bar 17 is rotatably supported by the frame 11 about the rotation shaft 17 c. The trip bar 17 is formed in an L shape in side view.
The annular portion of the torsion spring 18 is rotatably held by the rotating shaft 17 c. As shown in fig. 1, in the closed state of the circuit breaker 100, one arm of the torsion spring 18 engages with the main body portion 17a of the trip bar 17 to bias the trip bar 17 in the direction indicated by the arrow G in fig. 1 about the rotation shaft 17 c. The other arm of the torsion spring 18 engages with the rod portion 16, and biases the rod portion 16 in the direction indicated by the arrow H in fig. 1.
The 1 st frame 20 and the 2 nd frame 30 are coupled by caulking in a state where the operation handle 12, the lever 16, and the trip bar 17 are rotatably supported, respectively. The joining by caulking is performed for the projecting portions 22, 23 in a state where the tip end portions of the projecting portions 22, 23 in the 1 st frame 20 are inserted into the mounting holes 31a, 31b formed in the flat plate-like portion 31 of the 2 nd frame 30.
The structure for attaching the operation handle 12, the lever 16, and the trip bar 17 to the frame 11 is not limited to the above structure. That is, the operation handle 12, the lever 16, and the trip bar 17 may be rotatably supported by the frame 11. The structure for maintaining the non-release state in the opening/closing mechanism section 10 is not limited to the above example.
Fig. 4 is an external perspective view of a lever in the circuit breaker according to embodiment 1. As shown in fig. 4, the rod portion 16 has: a base end portion 161 in which the bearing holes 16a and 16b are formed; a flat plate portion 162 having a flat plate shape from the base end portion 161 to the tip end side; and a protrusion 163 inserted into the opening 31f of the frame 11.
The flat plate portion 162 has: an abutment portion 16c that abuts against the roller 14; and an engaging portion 16d that engages with an engaging portion 17b of the release strip 17 formed in a planar shape. The flat plate portion 162 abuts against the roller 14 on one surface 164, and engages with the engagement portion 17b of the trip bar 17 on the other surface 164.
Fig. 5 is a diagram showing a case where the movement direction of the roller is regulated by the lever in the circuit breaker according to embodiment 1. When the current abnormality is not detected by the trip mechanism unit 50, as shown in fig. 1 and 2, the armature 54 of the trip mechanism unit 50 does not act on the trip bar 17. Therefore, as shown in fig. 5, the trip bar 17 engages the engaging portion 16d of the lever 16 to keep the opening/closing mechanism 10 in the non-tripped state.
Thereby, the lever portion 16 is fixed at the position shown in fig. 1 and 2, and the moving direction of the roller 14 is regulated to the vertical direction. That is, the roller 14 moves along the surface 164 of the contact portion 16c in accordance with the operation of the operation handle 12, and the roller 14 moves the pressing plate 13 in the vertical direction.
Fig. 6 is a diagram showing a relationship between an engagement portion of a lever and an engagement portion of a trip bar in the circuit breaker according to embodiment 1. As shown in fig. 6, the engagement portion 17b of the trip bar 17 has an abutment surface 17d that abuts against the lever portion 16, and the abutment surface 17d is formed in an arc shape along the rotation locus W of the trip bar 17 in a side view. For example, the contact surface 17d has an arc shape substantially the same as an arc centered on the rotation center O of the rotation shaft 17c in a side view. The rotation locus W of the trip bar 17 is a circle centered on the rotation center O of the rotation shaft 17 c.
Thus, even if the trip bar 17 rotates about the rotation center O in a state where the engagement portion 17b of the trip bar 17 is engaged with the engagement portion 16d, the distance L between the rotation center O and the engagement portion 16d can be kept substantially constant.
Therefore, since the range of variation of the force applied to the trip bar 17 by the engaging portion 16d of the lever portion 16 is substantially determined by the dimensional accuracy of the abutment surface 17d, it is possible to suppress fluctuation of the required operating force, which is the force required for the trip operation by the trip mechanism portion 50, and to stabilize the required operating force.
However, as shown by a broken line in fig. 6, a small irregularly shaped portion 17f may be formed on the contact surface 17d of the trip bar 17 due to molding failure. Since the clearance between the engaging portion 16d and the region other than the portion of the abutting surface 17d of the trip bar 17 abutting against the engaging portion 16d is small, the irregularly-shaped portion 17f may continue to abut against the engaging portion 16d when the trip bar 17 rotates about the rotation center O. Therefore, the distance L may vary with the rotation of the trip bar 17, and the required operating force may continuously vary during the trip operation, and the fluctuation of the required operating force may increase.
Therefore, a protruding portion 16e protruding toward the engaging portion 17b is formed at the tip of the engaging portion 16d in the lever portion 16 according to embodiment 1, and the protruding portion 16e abuts against the abutment surface 17d of the trip bar 17 when engaging with the engaging portion 17 b. Thus, even when the irregularly shaped portion 17f is present, the region of the engaging portion 16d of the lever 16 that abuts against the abutment surface 17d can be limited, and the tripping operation can be stabilized.
Specifically, the trip bar 17 rotates until the convex portion 16e reaches the irregularly shaped portion 17f, and the distance L can be made substantially constant, so that fluctuation in the required operating force can be suppressed. When the convex portion 16e reaches the irregularly shaped portion 17f, the distance L changes because the convex portion 16e jumps over the irregularly shaped portion 17f, but the period during which the irregularly shaped portion 17f contacts the convex portion 16e is short during the rotation of the trip bar 17. Therefore, if the period in which the required operating force increases is small as a whole in the trip operation period, fluctuation of the required operating force can be suppressed during the trip operation from the start of rotation of the trip bar 17 to the completion of trip, and the trip operation can be stabilized, as compared with the case where the protrusion 16e is not provided.
Next, a trip operation of the circuit breaker 100 will be described. Fig. 7 is a side sectional view showing an internal structure of the circuit breaker in the tripped state according to embodiment 1, and fig. 8 is a diagram showing a relationship between an engaging portion of a lever and an engaging portion of a trip bar in the tripping operation of the circuit breaker according to embodiment 1. In fig. 8, the state indicated by the thin broken line shows the state before the trip operation, and the state indicated by the solid line shows the state after the trip operation.
In the state shown in fig. 1, if an overcurrent or a short-circuit current flows through the electromagnetic coil 52, magnetic flux is generated from the electromagnetic coil 52 to generate magnetic force in the core 51, and a force that is attracted in an upward direction acts on the core 51. Therefore, the attraction force attracting the armature 54 in the core 51 increases, and the one end 541 of the armature 54 moves downward as shown in fig. 7.
If one end 541 of the armature 54 moves downward, the armature 54 rotates about the center portion 542, and the other end 543 moves forward. The other end 543 moved forward presses the body 17 a. When the armature 54 presses the body portion 17a, the body portion 17a of the trip bar 17 rotates in a direction toward the engagement portion 16d of the lever portion 16.
As a result, as shown in fig. 8, the trip bar 17 is in a state in which the opening/closing mechanism section 10 is in a tripped state, the engagement between the engagement portion 17b of the trip bar 17 and the engagement portion 16d of the lever section 16 is disengaged, the lever section 16 rotates backward, and the engagement between the roller 14 and the pressing plate 13 is released. Accordingly, the pressing state of the pressing plate 13 by the roller 14 is released, and therefore the pressing plate 13 and the movable contact 3 are pushed up by the separation spring 4, and the movable contact 3a is separated from the fixed contact 2a, resulting in the disengaged state shown in fig. 7.
As described above, if the trip mechanism unit 50 detects an overcurrent or a short-circuit current, it acts on the opening/closing mechanism unit 10, and the opening/closing mechanism unit 10 can be set to the tripped state. When the circuit breaker 100 is an earth leakage breaker, the trip mechanism unit 50, if detecting an earth leakage, acts on the opening/closing mechanism unit 10 to release the opening/closing mechanism unit 10.
Next, an operation when the circuit breaker 100 is reset from the tripped state to the off state will be described. In the circuit breaker 100, if the operation handle 12 is moved backward from the state shown in fig. 7, the link 15 and the roller 14 are moved forward following the movement of the operation handle 12, and the roller 14 is pulled out from the gap between the lever 16 and the pressing plate 13.
After the roller 14 is pulled out from the gap between the lever portion 16 and the pressing plate 13, the protrusion 12d of the operating lever 12 contacts the lever engaging surface 16f of the lever portion 16, and the lever portion 16 is rotated in the direction of the arrow N shown in fig. 7. Thereby, the lever 16 that has locked the trip bar 17 moves in a direction away from the trip bar 17. Therefore, the trip bar 17 is rotated in the direction of the arrow M shown in fig. 7 by the force of the torsion spring, not shown, and the engagement between the engagement portion 17b of the trip bar 17 and the engagement portion 16d of the lever 16 is reset, so that the circuit breaker 100 is brought into the off state shown in fig. 2.
As described above, the circuit breaker 100 according to embodiment 1 includes: a fixed contact 2 having a fixed contact 2 a; a movable contact 3 having a movable contact 3a opposed to the fixed contact 2 a; an opening/closing mechanism section 10 that contacts and separates the fixed contact 2a and the movable contact 3 a; and a trip mechanism unit 50 configured to set the opening/closing mechanism unit 10 in a tripped state when the current abnormality is detected. The opening/closing mechanism section 10 includes: a trip bar 17 that rotates around a rotation shaft 17c by the action of the trip mechanism portion 50 and has an arc-shaped engagement portion 17b along the rotation direction of the rotation shaft 17 c; and a lever portion 16 which is a state holding member having a planar engaging portion 16d which engages with the arcuate engaging portion 16 d. The trip bar 17 can be changed to the following attitude by rotating about the rotation shaft 17 c: the arc-shaped engaging portion 17b engages with the planar engaging portion 16d to set the opening/closing mechanism portion 10 in the non-release state; and the engagement between the arc-shaped engagement portion 17b and the flat engagement portion 16d is released, and the opening/closing mechanism portion 10 is set to the disengaged state. The engaging portion 16d has a planar shape with a projection 16e formed at the tip. This can suppress a change in force required to guide the trip operation of the opening/closing mechanism unit 10.
The protruding portion 16e is formed as a convex line in the axial direction of the rotation shaft 17c of the trip bar 17. The axial direction of the rotation shaft 17c is the X-axis direction. Accordingly, compared to the case where the convex portion extends in the direction orthogonal to the axial direction of the rotary shaft 17c of the trip bar 17, the period from when the trip bar 17 rotates until the engagement between the trip bar 17 and the lever portion 16 is released is short until the convex portion 16e jumps over the irregularly shaped portion 17f, and therefore, the influence on the trip operation due to the change in the fluctuation of the required operating force is small, and the trip operation can be stabilized.
The convex portion 16e is formed over the entire axial direction of the rotating shaft 17c at the distal end of the engaging portion 16 d. Thus, the engagement portion 16d can be brought into contact with the abutment surface 17d of the trip bar 17 in the axial direction of the rotation shaft 17c of the trip bar 17, and therefore, the engagement between the trip bar 17 and the lever portion 16 can be performed more stably.
The circuit breaker according to embodiment 2 is different from the circuit breaker 100 according to embodiment 1 in the structure of the lever. Hereinafter, the same reference numerals are used to designate components having the same functions as those in embodiment 1, and the description thereof will be omitted, and the differences from the lever portion 16 in embodiment 1 will be mainly described.
Fig. 9 is a side view of a lever according to embodiment 2, and fig. 10 is a rear view of the lever according to embodiment 2. As shown in fig. 9, a rod portion 16A according to embodiment 2 includes: a base end portion 161 in which bearing holes 16a and 16b are formed; a flat plate-like portion 162A continuous with the base end portion 161 and having a flat plate shape up to the tip end side; and a projection 163.
The flat plate portion 162A includes: an abutment portion 16c that abuts against the roller 14; and a planar engaging portion 66d that engages with the engaging portion 17b of the trip bar 17. Like the flat plate portion 162, the flat plate portion 162A abuts against the roller 14 on one surface 164 and engages with the engagement portion 17b of the trip bar 17 on the other surface 165A.
A projection 66e is formed at the tip of the engagement portion 66d in the lever portion 16A, and the projection 66e abuts against the abutment surface 17d of the trip bar 17, similarly to the projection 16 e.
The convex portion 66e is formed as a convex line, similarly to the convex portion 16 e. That is, the protruding portion 66e extends in the axial direction of the rotating shaft 17c of the trip bar 17 and is formed over the entire axial direction of the rotating shaft 17c at the distal end of the engaging portion 66 d. The engaging portion 66d has a recess 66f formed adjacent to the projection 66 e. The convex portion 66e and the concave portion 66f are formed by forging the region 60 of the engaging portion 66d in the rod portion 16A rearward.
As described above, the convex portion 66e in the engaging portion 66d of the rod portion 16A according to embodiment 2 is formed over the entire axial direction of the rotary shaft 17 c. The engaging portion 66d has a concave portion 66f, and the concave portion 66f is formed adjacent to the convex portion 66 e. The convex portion 66e and the concave portion 66f can be formed by forging the region 60. In this case, since the convex portion 66e is not a region to be swaged, the tip of the convex portion 66e can be easily formed into a flat shape, and the convex portion 66e can be stably brought into contact with the contact surface 17 d.
The circuit breaker according to embodiment 3 is different from the circuit breaker 100 according to embodiment 1 in the structure of the lever. Hereinafter, the same reference numerals are used to designate components having the same functions as those in embodiment 1, and the description thereof will be omitted, and the differences from the lever portion 16 in embodiment 1 will be mainly described.
Fig. 11 is a side view of a lever according to embodiment 3, and fig. 12 is a rear view of the lever according to embodiment 3. As shown in fig. 11 and 12, the rod portion 16B according to embodiment 2 includes: a base end portion 161 in which bearing holes 16a and 16b are formed; a flat plate-like portion 162B continuous with the base end portion 161 and having a flat plate shape up to the tip end side; and a projection 163.
The flat plate portion 162B includes: an abutment portion 16c that abuts against the roller 14; and an engaging portion 76d formed in a planar shape and engaged with the engaging portion 17b of the trip bar 17. Like the flat plate portion 162, the flat plate portion 162B abuts against the roller 14 on one surface 164, and engages with the engagement portion 17B of the trip bar 17 on the other surface 165B.
A projection 76e is formed at the tip of the engagement portion 76d in the lever portion 16B, and the projection 76e abuts against the abutment surface 17d in the engagement portion 17B of the trip bar 17, similarly to the projection 16 e.
The projection 76e extends in the axial direction of the rotation shaft 17c of the trip bar 17. The convex portion 76e is formed at the center of the rotation shaft 17c in the axial direction at the tip end of the engaging portion 76d, and is not formed at both end portions of the rotation shaft 17c in the axial direction. The protruding portion 76e is formed by forward forging a part of the front end of the engaging portion 76d in the rod portion 16B.
As described above, the convex portion 76e in the engaging portion 76d of the rod portion 16B according to embodiment 3 is formed in the axial center portion of the rotating shaft 17 c. Therefore, when the irregularly shaped portions 17f are present at both ends of the contact surface 17d of the trip bar 17 in the axial direction of the rotating shaft 17c, the convex portion 76e does not jump up to the irregularly shaped portions 17f, and therefore, the force required to guide the trip operation of the opening/closing mechanism portion 10 can be stabilized.
In the above example, the number of the convex portions 76e is 1 at the center of the tip of the engaging portion 76d, but a plurality of convex portions 76e may be arranged at intervals in the axial direction of the rotating shaft 17c at the tip of the engaging portion 76 d.
In the above example, the convex portions 16e, 66e, and 76e are formed at the distal ends of the engaging portions 16d, 66d, and 76d, but the convex portions 16e, 66e, and 76e may be formed at a position that is in contact with the engaging portion 17b when engaged with the engaging portion 17b, and may be formed at a position other than the distal ends of the engaging portions 16d, 66d, and 76 d.
The trip mechanism unit 50 is not limited to the above-described configuration. For example, the trip mechanism unit 50 may be configured to guide the trip operation of the opening and closing mechanism unit 10 by rotating the trip bar 17 of the opening and closing mechanism unit 10 by the amount of thermal bending of the bimetal.
The configuration described in the above embodiment is an example of the content of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or modified without departing from the scope of the present invention.
Claims (6)
1. A circuit breaker, comprising:
a fixed contact having a fixed contact point;
a movable contact having a movable contact opposed to the fixed contact;
an opening/closing mechanism unit that contacts and separates the fixed contact and the movable contact; and
a trip mechanism unit for setting the opening/closing mechanism unit to a tripped state,
the opening/closing mechanism section includes:
a trip bar that rotates around a rotation shaft by an action of the trip mechanism portion, and has an arc-shaped engagement portion along a rotation direction of the rotation shaft; and
a state holding member having a planar engaging portion that engages with the arcuate engaging portion,
the trip bar can be changed to the following attitude by rotation about the rotation axis: the arc-shaped engaging portion engages with the planar engaging portion to set the opening/closing mechanism portion to a non-release state; and the engagement between the arc-shaped engaging portion and the planar engaging portion is released to set the opening/closing mechanism portion in a disengaged state,
the planar engaging portion has a convex portion protruding toward the arc-shaped engaging portion.
2. The circuit breaker of claim 1,
the projection extends in the axial direction of the rotary shaft.
3. The circuit breaker of claim 2,
the convex portion is formed over the entire axial direction of the rotary shaft at the planar engagement portion.
4. The circuit breaker of claim 2,
the convex portion is formed at a central portion in the axial direction of the rotary shaft in the planar engagement portion.
5. The circuit breaker of claim 2,
the planar engaging portion has a concave portion formed adjacent to the convex portion.
6. The circuit breaker according to any one of claims 1 to 5,
the state retaining member includes a rod portion having a base end rotatably supported and a tip end formed with the planar engaging portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-177960 | 2017-09-15 | ||
| JP2017177960A JP6775477B2 (en) | 2017-09-15 | 2017-09-15 | Circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109509692A CN109509692A (en) | 2019-03-22 |
| CN109509692B true CN109509692B (en) | 2021-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810372049.8A Active CN109509692B (en) | 2017-09-15 | 2018-04-24 | Circuit breaker |
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| Country | Link |
|---|---|
| JP (1) | JP6775477B2 (en) |
| CN (1) | CN109509692B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201387861Y (en) * | 2009-04-21 | 2010-01-20 | 上海良信电器股份有限公司 | Hydraulic electromagnetic breaker |
| CN102163521A (en) * | 2010-02-22 | 2011-08-24 | 三菱电机株式会社 | Circuit breaker |
| CN103140911A (en) * | 2010-09-21 | 2013-06-05 | 松下电器产业株式会社 | Circuit breaker |
| CN105378888A (en) * | 2013-07-12 | 2016-03-02 | 三菱电机株式会社 | Circuit breaker |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4288859B2 (en) * | 2001-02-23 | 2009-07-01 | パナソニック電工株式会社 | Circuit breaker trip device |
| US7843290B2 (en) * | 2007-08-10 | 2010-11-30 | Ls Industrial Systems Co., Ltd. | Molded case circuit breaker with contact on mechanism |
| JP5180905B2 (en) * | 2009-05-11 | 2013-04-10 | 三菱電機株式会社 | Circuit breaker |
-
2017
- 2017-09-15 JP JP2017177960A patent/JP6775477B2/en active Active
-
2018
- 2018-04-24 CN CN201810372049.8A patent/CN109509692B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201387861Y (en) * | 2009-04-21 | 2010-01-20 | 上海良信电器股份有限公司 | Hydraulic electromagnetic breaker |
| CN102163521A (en) * | 2010-02-22 | 2011-08-24 | 三菱电机株式会社 | Circuit breaker |
| CN103140911A (en) * | 2010-09-21 | 2013-06-05 | 松下电器产业株式会社 | Circuit breaker |
| CN105378888A (en) * | 2013-07-12 | 2016-03-02 | 三菱电机株式会社 | Circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2019053914A (en) | 2019-04-04 |
| JP6775477B2 (en) | 2020-10-28 |
| CN109509692A (en) | 2019-03-22 |
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