JP4720059B2 - Circuit breaker trip display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to a circuit breaker such as an auto breaker applied to a low voltage distribution circuit, and a rotary handle for turning on and off the main circuit contact is stopped at an intermediate position between an ON position and an OFF position during a trip operation. It is related with the trip display apparatus of the circuit breaker which performed the trip display.
[0002]
[Prior art]
First, the structure of a circuit breaker that is an object of the present invention will be described with reference to FIGS. 3 (a) to 3 (d), taking the above-described auto breaker as an example. In FIG. 3 (a), 1 is a circuit breaker case, 2 is a main circuit contact breaking unit, 3 is a main circuit contact switching mechanism, 4 is an overcurrent tripping device, and 5 is an open / closed switch mounted on the top of the case 1. An operation rotary handle 6 is a transmission gear mechanism that links the rotary handle 5 and the opening / closing mechanism 3.
[0003]
Here, as shown in FIGS. 3 (b) and 3 (c), the opening / closing mechanism section 3 is provided on a frame (assembly frame) 7 with a toggle gear 3a, an opening / closing lever 3b opposed to the cutoff section 2, a toggle gear 3a, and an opening / closing lever 3b. A transmission gear in which a toggle link mechanism 3c that links the two and a latch mechanism 3d that links between the toggle link mechanism 3c and the overcurrent tripping device 4 are assembled, and the toggle gear 3a is combined with a clutch gear. A bevel gear is coupled to the handle shaft of the rotary operation handle 5 via a bevel gear.
[0004]
The open / close mechanism 3 having the above structure is compatible with the illustrated rotary type operating handle and a rocker type operating handle different from the rotary type (a type in which the handle is tilted to the left and right to perform ON / OFF operation) When a rocker type operation handle is adopted for the circuit breaker, the illustrated toggle gear 3a is replaced with a rocker type handle, and the detailed structure and operation of the opening / closing mechanism are the same as those of the present invention. This is disclosed in Japanese Patent Application Laid-Open No. 2001-23499 filed earlier. The structure of the rotary handle 5 is described in detail in Japanese Patent Application No. 2000-302154 filed by the same applicant as the present invention.
[0005]
That is, in FIG. 3B, the toggle link mechanism 3c is composed of two hinged links 3c-1 and 3c-2, and the upper end of the link 3c-1 is pin-coupled to the tip of the toggle gear 3a. The drive pin attached to the lower end of -2 faces the open / close lever 3c. The latch mechanism 3d is a combination of a latch 3d-1 and a latch receiver 3d-2. One end of the latch 3d-1 is pivotally supported on the same shaft as the toggle gear 3a, and a biasing spring (not shown) is used. The claw portion at the end is locked to the latch receiver 3d-2, and is further U-shaped so as to straddle between the latch 3d-1 and the intermediate hinge point of the toggle link 3c-1 / 3c-2. The connecting pin 3e is bridged. The link pin of the link 3c-1 / toggle gear 3a, one end of the U-shaped link pin 3e coupled to the latch 3d-1, and the drive pin attached to the lower end of the link 3c-2 are shown in FIG. A guide groove is supported by rail grooves 7a, 7b, 7c formed in the frame 7 of the opening / closing mechanism 3 shown.
[0006]
In addition, the spring (tension coil spring) 3f shown in the figure is a toggle for holding the toggle gear 3a (or rocker type operation handle) at the trip display position described later when the circuit breaker trips. This is an urging spring that spans between a connecting pin between the gear 3 a and the toggle link mechanism 3 c and the frame 7 of the opening / closing mechanism 4.
[0007]
Further, the supporting shaft 3b-1 of the opening / closing lever 3b is supported by the frame 7 of the opening / closing mechanism section 3, and the main circuit contact is opened by the main opening / closing spring (torsion coil spring) 3b-2 provided on the shaft. It is energizing in the extreme direction.
On the other hand, as shown in FIG. 3 (d), the cutoff portion 2 of the main circuit contact is a contact spring (compression) of the fixed contact 2a, the bridge-type movable contact 2b, the movable contact holder 2c, and the movable contact 2b. Spring) 2d and an arc extinguishing plate 2e are assembled, and the upper end of the movable contact holder 2c is opposed to the lever end of the open / close lever 3b. The figure shows an ON state in which the main circuit contact is closed, the tip of the open / close lever 3b is held at a position retracted upward, and the movable contact 2b is fixed by receiving the spring force of the contact spring 2d. It is in contact with the contact 2a.
[0008]
Next, FIGS. 4 (a) to 4 (c) show the states of the opening / closing mechanism section 3 and the rotary handle 5 having the above-described configuration during ON / OFF and trip operations. That is, in the circuit breaker ON state in which the main circuit contact is closed, as shown in FIG. 4 (a), the handle 5 indicates the ON position and is held at this position. When the handle 5 is manually turned from ON to OFF so as to open the pole, the toggle gear 3a is rotated clockwise via the drive gear 8 as shown in FIG. The toggle link mechanism 3c of the mechanism part 3 rotates counterclockwise to release the restraint of the opening / closing lever 3b. As a result, the open / close lever 3b is rotated clockwise by the stored spring force of the main open / close spring, and the movable contact 2b of the main circuit is opened by hitting the movable contact holder 2c shown in FIG. 3 (d). .
[0009]
Contrary to the above, when the handle 5 is turned from the OFF position (see FIG. 4B) to the ON position (see FIG. 4A), the link mechanism 3c of the opening / closing mechanism section 3 is rotated clockwise. The opening / closing lever 3b is pushed down against the main opening / closing spring 3b-2. As a result, the opening / closing lever 3b rotates counterclockwise and is detached from the movable contact holder 2c, and in response to this, the movable contact 2b receives the spring force of the contact spring 2d and closes the pole. Further, the operation handle 5 is held at the ON position by the reaction force of the main opening / closing spring of the opening / closing lever 3b, and displays that the main circuit contact is in the closed state. In this ON / OFF state, the latch 3d-1 of the latch mechanism 3d is locked to the latch receiver 3d-2 and held at the illustrated position, and the fulcrum of the U-shaped connecting pin 3e coupled to the latch 3d-1. Is not displaced.
[0010]
On the other hand, when the circuit breaker is energized and the overcurrent tripping device 4 shown in FIG. 3 (a) operates to release the engagement between the latch 3d-1 and the latch receiver 3d-2 of the latch mechanism 3d, As shown in FIG. 4 (c), the latch 3d-1 is urged by the spring and swings in the clockwise direction. Following this, the toggle links 3d-1 and 3d-2 are connected via the U-shaped connecting pin 3e. And the intermediate hinge point is displaced in the direction of the arrow. As a result, the open / close lever 3b rotates clockwise to open the movable contact 2b of the main circuit as in the case of the OFF operation.
[0011]
Also, in order to make it possible to visually check the trip operation state of the circuit breaker from the position of the handle during the trip operation, the handle 5 is conventionally set between the ON position and the OFF position using a trip display device described later. The trip display position is stopped. In order to reopen the main circuit contact after the trip operation of the circuit breaker, the operation handle 5 is temporarily turned from the trip display position where the operation handle 5 is stopped to the OFF position, and is latched 3d via the toggle link mechanism 3c and the connecting pin 3e. -1 is pushed up counterclockwise, and its tip claw is hooked on the latch receiver 3d-2 to reset it, and then the operation handle 5 is turned from the OFF position to the ON position to close the main circuit contact.
[0012]
Next, a conventional trip display device for restraining and holding the rotary handle 5 at the trip display position during a trip operation of the circuit breaker will be described. In other words, the opening / closing mechanism 3 having the above-described configuration that is compatible with the rotary handle and the rocker handle is equipped with a return spring 3f for stopping the rocker handle at the trip display position as described above. Yes.
[0013]
Here, when a rocker type handle is adopted as the operation handle and the rocker type handle is directly assembled to the opening / closing mechanism unit 3 (replaced by the toggle gear 3a), the rocker type handle is not used when the circuit breaker trips. Since it is in a free state, the rocker type handle stops at the trip display position between the ON position and the OFF position in response to the tension spring force of the biasing spring 3f.
[0014]
On the other hand, the circuit breaker that employs the rotary handle 5 as the opening / closing operation handle of the breaker has the following problems. That is, as described in Japanese Patent Application No. 2000-302154, the rotary handle has a clutch gear return spring (indicated by reference numeral 5a in FIG. 4 (a)) attached to the handle. In addition to being biased by the spring in the OFF position direction, a transmission loss due to meshing of the rolling gear 8 and the toggle gear 3a occurs in the transmission path between the handle 5 and the toggle link mechanism 3c of the opening / closing mechanism section 3. Furthermore, the rotary handle 5 can be moved to the trip display position only by the spring force of the return spring 3f described above (the spring force of the return spring 3f is restricted by the relationship with the main open / close spring of the open / close lever 3b and cannot be used as a strong spring). It is difficult to stop and hold.
[0015]
Therefore, as a countermeasure against the above problem, conventionally, as shown in FIGS. 5 (a) and 5 (b), a holding member 9 for locking and restraining the latch 3d-1 at the trip position is additionally provided inside the opening / closing mechanism 3. The thing of the structure which is made is known. That is, the holding member 9 is a plastic molded product having elasticity, and a hook-shaped claw portion 9a is formed at the tip thereof, and is assembled to the inside of the frame 7 of the opening / closing mechanism portion 3 via the mounting seat 9b. At the assembly position, the claw portion 9a at the tip protrudes from the movement locus of the claw portion 3g (claw that is latched to the latch receiver) formed at the tip of the latch 3d-1.
[0016]
With this configuration, when the circuit breaker trips, the latch 3d-1 is disengaged from the latch receiver 3d-2 (see FIGS. 3 and 4), and rotates from the ON position (chain line) to the trip position (solid line). At the end of this rotation, the front end claw portion 3g of the latch 3d-1 moves over the front end claw portion 9a while pushing the holding member 9 sideways, and is caught by the claw portion 9a and is held in this position. As a result, the rotary handle 5 that is mechanically linked via the latch 3d-1, the connecting pin 3e, the toggle link 3c-1, the toggle gear 3a, and the drive gear 8 is added with the spring force of the biasing spring 3f. The trip position is displayed while being held at the position shown in 5 (a) (corresponding to the trip position in FIG. 4 (c)). When the handle 5 is turned to the OFF position by the reset operation after the trip operation, the latch 3d-1 moves over the claw portion 9a of the holding member 9 in the opposite direction to the reset position by the operation force.
[0017]
[Problems to be solved by the invention]
By the way, the trip display device having the conventional structure that holds and holds the rotary handle at the trip display position during the trip operation of the circuit breaker as described above has the following problems in terms of installation space and reliability. That is,
(1) In FIG. 5, in order to latch and hold the latch 3d-1 swinging to the trip position on the claw portion 9a of the holding member 9, the leading end claw portion 3g of the latch is engaged with the claw of the holding member 9 in the swinging process. In order to get over the portion 9a, it is necessary to secure a space W required to bend and deform the holding member to the side in the opening / closing mechanism portion 3. However, it is necessary to make the rotary handle and the rocker handle compatible. In the opening / closing mechanism section 3 having the above-mentioned configuration standardized, each part such as a toggle link mechanism and an opening / closing lever including a latch mechanism is assembled inside the frame 7 with almost no gap.
[0018]
For this reason, it is difficult to additionally equip the opening / closing mechanism portion 3 with the holding member 9 while avoiding unnecessary interference with the internal mechanism of the opening / closing mechanism portion of the circuit breaker employing the rotary handle. . Further, if the opening / closing mechanism portion is designed so as to secure the installation space for the holding member 9 in advance, there is a problem that the external dimensions of the opening / closing mechanism portion 3 become large and the circuit breaker becomes large.
[0019]
(2) In FIG. 5, the holding member 9 itself is required to have a spring force that overcomes the spring force of the return spring 5a of the rotary handle 5 and restrains the latch 3d-1 in the trip position. The member (plastic) 9 maintains a stable holding function and high reliability over a long period of time due to aging, deterioration of elasticity (spring property) due to repeated changes in ambient temperature, and wear of the claw portion 9a due to repeated operations. It is difficult to let
[0020]
The present invention has been made in view of the above points, and is intended for circuit breakers that employ a rotary handle in an open / close mechanism that is standardized by providing compatibility with a rotary handle and a rocker handle. As a trip display means for stopping the rotary handle at the trip display position set between the ON position and the OFF position, the trip holding member can be easily used by skillfully utilizing the internal mechanism and play space of the opening / closing mechanism section. The purpose is to provide a space-saving, highly reliable trip display device that can be retrofitted.
[0021]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a switching mechanism portion of a main circuit contact is connected to the frame via a rotary opening / closing operation handle and a toggle gear, the toggle gear and the main contact. A toggle link mechanism that links the open / close lever, and a latch mechanism that includes a latch and latch receiver that links the toggle link mechanism and the overcurrent trip device are assembled to respond to the operation of the overcurrent trip device. Applied to a circuit breaker that releases the latch and trips the main circuit contact so that the rotary handle stops at the trip display position set between the ON and OFF positions during the trip operation. In the trip display device of the circuit breaker
As a means of stopping the rotary handle at the trip display position, a plate-shaped trip holding mechanism that restrains and holds the connecting pin spanned between the latch and the toggle link mechanism at the trip operation position and stops the handle at the trip display position. A member is prepared as a retrofitting part, and the trip holding member is inserted into a gap between the frame wall surface of the opening / closing mechanism portion and its internal mechanism and mounted in a fixed position (Claim 1). The configuration is as described below.
[0022]
(1) The trip holding member is formed with an engaging projection protruding on the movement locus of the connecting pin interlocking with the latch at the lower end of the elastic plate material, and a slit-like groove in the left-right direction is formed on the plate surface of the plate material. The structure is provided with a spring property in the vertical direction, and is installed along the frame wall surface of the opening / closing mechanism portion between the internal mechanism and the fixed mechanism (Claim 2).
[0023]
(2) In the preceding paragraph (1), a support arm for a position to be engaged with the support shaft of the latch is formed on the plate member of the trip holding member at the position where the trip holding member is interposed, and the trip is held via the support arm. The member is assembled at a fixed position in the opening / closing mechanism.
(3) In order to prevent the spring performance of the trip holding member from deteriorating due to changes in ambient temperature and aging, and to prevent wear of the engaging protrusion due to repeated loads, ensuring the durability and reliability of the trip holding member with a metal plate (Claim 4).
[0024]
In the above configuration, the plate-like trip holding member is made of a thin plate material having a thickness of about 1 mm. In the assembly process of the circuit breaker employing the rotary handle, By inserting and setting here using the play gap between the frame and its internal mechanism, it can be easily retrofitted to a predetermined position. The holding member can exhibit the same trip display function even if the plate material is metal or plastic, but if it is made of metal, there is a risk of deterioration due to aging, changes in ambient temperature, and wear due to repeated operations. As a result, long-term stable durability and reliability can be secured.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS. In the drawing of the embodiment, members corresponding to those in FIGS. 3 and 4 are denoted by the same reference numerals and description thereof is omitted.
That is, in the illustrated embodiment, as a trip display means for the rotary handle 5, the trip holding plate 10 made of a thin plate material is used instead of the conventional holding member 9 described in FIG. (Same structure as the open / close mechanism shown) and a slight play gap remaining between the frame 7 and the internal mechanisms (the toggle gear 3a, the toggle link mechanism 3c, and the latch 3d-1) installed inside the frame 7 , Wearing.
[0026]
The trip holding plate 10 is made of a thin metal plate having a thickness of 1 mm or less, and has a claw-like engaging projection 10a protruding downward at the center of the lower end of the plate as shown in FIG. 1 (c), and A slit-like groove 10b extending in the left-right direction along the lower edge including the projection 10a is opened on the plate surface of the plate material to impart springiness in the vertical direction, and further, the support arm 10c and the embossed shape are formed on the upper side. The support protrusion 10d is formed by pressing.
[0027]
1 (a) and 1 (b), the support arm 10c has a support shaft 3a-1 of a toggle gear 3a on which a latch 3d-1 of the latch mechanism 3 is supported. The engagement protrusion 10a formed on the lower end side of the plate material is positioned so as to protrude into the movement path of the U-shaped connecting pin 3e interlocked with the latch 3d-1 of the latch mechanism 3d. It is installed.
[0028]
Here, the mounting procedure of the trip holding plate 10 will be described with reference to FIGS. 2 (a) and 2 (b). First, as shown in FIG. 2 (a), the support shaft 3a-1 is inserted from the upper side of the opening / closing mechanism 3 into an oblique posture along the inner wall surface of the frame 7 so as to be sandwiched from above and below, and then returned to the horizontal posture. As shown in FIG. 2 (b), the support shaft 3a-1 pushed into the back is sandwiched by the support arm 10b, and at the same time, the embossed protrusion 10d formed on the plate material is positioned in advance and drilled in the side wall of the frame 7. It is fitted and fixed in the joint hole 7d.
[0029]
Next, the trip display operation of the rotary handle 5 configured as described above will be described with reference to FIG. That is, as described in FIGS. 4A to 4C, when the circuit breaker is in the ON or OFF state, the latch 3d-1 of the latch mechanism 3d is locked to the latch receiver 3d-2. The upper end shaft portion of the U-shaped connecting pin 3e having one end connected to d-1 is stopped at a position I shown in FIG. 1 (c). In this state, the engagement protrusion 10a of the trip holding plate 10 and the connecting pin 3e are separated and do not interfere with each other.
[0030]
On the other hand, when the circuit breaker trips, the latch 3d-1 disengages from the latch receiver 3d-2 and rotates clockwise, and the connecting pin 3e moves to the position shown in FIG. That is, in FIG. 1 (c), the connecting pin 3e moves in the direction of the arrow from the position I to the position II toward the trip position III. As a result, the connecting pin 3e passes over the engaging projection 10a of the trip support plate 10 while moving upward at the position II in the middle of movement, and enters the lower side of the engaging projection 10a at the terminal position III, and the trip holding plate itself bends. It is pressed from above by the spring force and held in this position.
[0031]
As a result, the opening / closing mechanism 3 is connected via the toggle link 3c-1 coupled to the other end of the connecting pin 3e, the toggle gear 3a pin-coupled to the toggle link 3c-1, and the transmission gear 8 meshed with the toggle gear 3a. The connected rotary handle 5 (the handle 5 is urged in the OFF direction by a return spring 5a having a weak spring force assembled to the handle itself) is also subjected to the spring force of the urging spring 3f (see FIG. 4). The trip operation status is displayed by stopping at the trip display position between the ON position and OFF position.
[0032]
When the reset operation is performed by turning the handle 5 to the OFF position in the process of re-inserting the circuit breaker after the trip operation, the connecting pin 3e of the latch 3d-1 is engaged with the trip holding plate 10 from the position III in FIG. 1 (c). Overcoming the mating protrusion 10a returns to the position I, engages and resets the latch receiver 3d-2, and then turns the handle 5 to the ON position to close the main circuit contact as described in FIG.
[0033]
In the case of a circuit breaker that uses a rocker-type handle as the operation handle of the circuit breaker and is directly attached to the opening / closing mechanism 3, the tripping is performed by the biasing spring 3f assembled to the opening / closing mechanism as described above. Since the display can be performed, the trip holding plate 10 is not necessary.
[0034]
【The invention's effect】
As described above, according to the present invention, a trip is intended for a circuit breaker equipped with a combination of a rotary handle and an opening / closing mechanism having compatibility between a rotary handle and a rocker handle having different operation methods. A connecting pin that spans between the latch and the toggle link mechanism assembled to the opening / closing mechanism as a trip display for stopping the rotary handle at the trip display position set between the ON and OFF positions during operation A plate-like trip holding member that restrains and holds the handle at the trip operation position and restrains the handle at the trip display position is prepared as a retrofitting part, and the trip holding member is a gap between the frame wall surface of the opening / closing mechanism and the internal mechanism. By inserting it into the fixed position,
The circuit breaker is designed by simply retrofitting the trip holding member to the opening / closing mechanism without changing the design of the opening / closing mechanism and without unnecessary interference with the internal mechanism, and stopping the rotary handle at the trip display position. Trip display can be performed. In addition, by making this plate-like trip retaining member made of metal, there is no risk of deterioration of spring properties due to aging, ambient temperature change, and wear due to repeated operation, thereby ensuring long-term stable durability and reliability. Therefore, it is possible to provide a trip display device for a circuit breaker having high practical value.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an embodiment of the present invention, in which (a) and (b) are a front view and a side sectional view, respectively, of a main part of a circuit breaker with a rotary handle incorporating a trip holding member; (c) is an operation explanatory view of the trip holding plate in (a). FIG. 2 is an explanatory view showing an assembling procedure when the trip holding plate shown in FIG. b) is a diagram showing the state of the first half and second half of the assembly process. FIG. 3 is a configuration diagram of a circuit breaker which is an object of the present invention, (a) is a schematic front view of the whole, and (b) is ( a) Cross-sectional side view showing the opening / closing mechanism part of (a), (c) is a perspective view showing the connection structure of the opening / closing mechanism part and the rotary handle, and (d) is the internal structure of the main circuit cutoff part in (a) FIG. 4 is a diagram for explaining the operation of the circuit breaker in FIG. 3, and (a), (b), and (c) are diagrams showing ON, OFF, and trip states, respectively. Configuration of the trip indicating device in an explanatory view of the operation, (a) a front view of the assembled to the operating device of the circuit breaker is, (b) a side view showing the holding operation [Description of symbols]
DESCRIPTION OF SYMBOLS 1 Circuit breaker case 2 Blocking part 3 Opening / closing mechanism part 3a Toggle gear 3a-1 Toggle gear support shaft 3b Opening / closing lever 3c Toggle link mechanism 3c-1, 3c-2 Toggle link 3d Latch mechanism 3d-1 Latch 3d-2 Latch receiver 3e U-shaped connecting pin 4 Tripping device 5 Rotary handle 6 Transmission gear mechanism 7 Frame of opening / closing mechanism section 10 Trip holding plate (trip holding member)
10a engagement protrusion 10b slit-like groove 10c support arm 10d support protrusion

Claims (4)

A toggle gear mechanism in which an opening / closing mechanism portion of the main circuit contact is connected to the frame via a rotary opening / closing operation handle and a gear, a toggle link mechanism for connecting the toggle gear and the main contact opening / closing lever, and A latch mechanism consisting of a latch and a latch receiver that link between the toggle link mechanism and the overcurrent trip device is assembled, the latch is released in response to the operation of the overcurrent trip device, and the main circuit contact is tripped. In the trip display device of the circuit breaker, which is applied to the circuit breaker configured as described above, and is configured to stop the rotary handle at a trip display position set between the ON position and the OFF position during a trip operation.
As a means for stopping the rotary handle at the trip display position, a plate-shaped trip holding mechanism that restrains and holds the connecting pin spanned between the latch and the toggle link mechanism at the trip operation position and stops the handle at the trip display position. A trip display device for a circuit breaker comprising a member as a retrofitting part, and the trip holding member being inserted into a gap between a frame wall surface of an opening / closing mechanism portion and an internal mechanism and mounted in a fixed position. The trip display device according to claim 1, wherein the trip holding member forms an engagement protrusion protruding on a movement locus of the connecting pin interlocking with the latch at a lower end of the elastic plate material, and the plate surface of the plate material in the left-right direction. A trip display device for a circuit breaker having a structure in which a slit-like groove is formed to provide springiness in the vertical direction. 3. The trip display device according to claim 2, wherein a support arm for a position to be engaged with a support shaft of the latch is formed on the plate member of the trip holding member at the position where the trip holding member is interposed. Trip display device. 4. The trip display device according to claim 1, wherein the trip holding member is made of a metal plate.

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