JP6641251B2 - Dial device and circuit breaker using the same - Google Patents

Description

  The present invention relates to a dial device for setting operating conditions and the like of a trip device when an overcurrent is detected in an electric circuit, and a circuit breaker including the dial device.

  When the circuit breaker detects an overcurrent exceeding the rated current, the tripping device operates and the contact of the switching mechanism provided in the breaker body opens to cut off the current. The operating conditions for the overcurrent, such as the rated current of the switching mechanism and the operating time of the trip device, are generally performed by adjusting the dial device attached to the circuit breaker (for example, see Patent Document 1).

This dial device has a rotary switch mounted on a circuit board, a cylindrical knob having a small diameter and a disk-shaped portion having a diameter larger than the knob, and is operated by being fitted with the rotary switch and operated. It is configured.
On the front surface of the circuit board, a unit cover having a round hole provided at a position corresponding to the knob portion is attached, and the disc-shaped portion of the dial is pressed with the unit cover to assemble the dial. When the dial is rotated and operated, the rotary switch can be rotated in conjunction with the rotation of the knob, and conditions for overcurrent such as operating conditions of the opening and closing mechanism such as a tripping operation can be set. (For example, see Patent Document 2).

  Furthermore, when the knob is rotated, by providing a portion that engages each time a predetermined amount of rotation is performed, the rotation of the dial and thus the rotation of the rotary switch can be positioned, and the operation of the opening / closing mechanism unit can be performed. Conditions for overcurrent, such as conditions, can be set with good reproducibility using a dial.

JP 2007-273159 A JP-A-2002-57004

  The size of the dial consisting of the disc-shaped part and the cylindrical knob part, the mounting position of the rotary switch on the circuit board, the gap between the circuit board and the unit cover covering them, and the round hole formed in the unit cover If the size, etc. of the dial greatly deviates from the standard value, the dial cannot be pressed by the unit cover, the dial and the rotary switch will be disengaged, and the dial operation cannot be transmitted to the rotary switch. There is.

  The present invention has been made in order to solve the above-described problems, and in a dial device for setting conditions for overcurrent such as operating conditions of an opening / closing mechanism unit, a result that a rotary switch and a dial are disengaged. Another object of the present invention is to provide a dial device for preventing a dial operation from being disabled, and a circuit breaker using the dial device.

A dial device according to the present invention includes: a rotary switch housed in a unit case; a rotary knob disposed on the rotary switch; a cylindrical knob portion; and a circumferential extension extending along an outer peripheral portion of the knob portion; A dial having an arm-shaped portion fixed to the outer peripheral portion of the portion and having a projection directed upward in the other end, a dial having a fitting portion fitted on the lower surface with the rotary switch, and the knob portion of the dial being penetrated. A round hole is formed, and a unit cover is fitted with the unit case, and the unit cover is pressed by a projection formed on the arm part of the dial, and the arm part is arranged on the outer peripheral part of the knob part. , And is divided into two or more in the circumferential direction .

  According to the present invention, since the protrusion of the arm-shaped portion formed on the dial of the dial device is brought into contact with and pressed against the unit cover of the dial device, the rotary switch and the dial are maintained in a fitted state. Can be prevented from being disabled.

FIG. 2 is a perspective view illustrating an appearance of the circuit breaker according to Embodiment 1 of the present invention. FIG. 2 is a plan view showing the appearance of the circuit breaker according to Embodiment 1 of the present invention. FIG. 2 is a perspective view of the circuit breaker according to Embodiment 1 of the present invention when an apparatus cover is removed. It is sectional drawing of the XX part of the circuit breaker which concerns on Embodiment 1 of this invention. FIG. 3 is a plan view of the circuit breaker according to Embodiment 1 of the present invention when an apparatus cover is removed. FIG. 3 is a plan view of an overcurrent detection setting unit according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of the overcurrent detection setting unit according to Embodiment 1 of the present invention. FIG. 2 is a plan view of the dial according to Embodiment 1 of the present invention. FIG. 2 is a side view of the dial according to Embodiment 1 of the present invention. It is sectional drawing of the YY part of the dial which concerns on Embodiment 1 of this invention. FIG. 2 is a perspective view showing a dial according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing a dial according to Embodiment 1 of the present invention. FIG. 3 is a perspective view of a unit cover of the overcurrent detection setting unit according to Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view of a ZZ portion of the overcurrent detection setting unit according to Embodiment 1 of the present invention. FIG. 9 is a perspective view of a unit cover of an overcurrent detection setting unit according to Embodiment 2 of the present invention. FIG. 9 is a partially enlarged perspective view of a unit cover of the overcurrent detection setting unit according to Embodiment 2 of the present invention. 9 is an internal structure of an overcurrent detection setting unit according to Embodiment 2 of the present invention. FIG. 13 is a side view of an opening / closing mechanism according to Embodiment 3 of the present invention.

  In the description of the embodiments and the drawings, parts denoted by the same reference numerals indicate the same or corresponding parts. In the description of the present embodiment, a rotary variable resistor is a switch that sets a resistance value by rotation, and a rotary circuit switch is a switch of a circuit that changes a contact position of a contact by rotation and conducts. Switch. Further, a rotary switch includes both of these, and refers to a switch that sets a resistance value by rotation or a switch that can perform circuit switching.

Embodiment 1.
The overall configuration of the circuit breaker according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2 are a perspective view and a plan view, respectively, showing the appearance of a circuit breaker to which the present invention is applied. 3 and 5 are a perspective view and a plan view, respectively, showing the internal structure of the circuit breaker to which the present invention is applied, with the device cover removed, and FIG. 4 is a cross-sectional view of the circuit breaker shown in FIG. It is sectional drawing of a part.

  The circuit breaker 100 of the present invention includes a device base 1 serving as a container for accommodating each member and a device cover 2 covering each member, and is formed on a front surface of the device base 1 shown in FIG. The device base 1 includes a plurality of load-side connection terminals 3 and a plurality of power supply-side connection terminals 4 formed on a surface of the device base 1 opposite to the load-side connection terminals 3.

  Inside the device base 1 and the device cover 2 constituting the circuit breaker 100, there is provided an opening / closing mechanism portion 5 for interrupting an overcurrent or a short-circuit current when the current is generated, and a pull-out for removing a contact of the opening / closing mechanism portion 5. A detaching device 6 is provided. Further, a dial device 7 for detecting an overcurrent and setting the operating condition of the actuator 8, a relay 9 for releasing a contact of the opening / closing mechanism unit 5 via the actuator 8 by an output signal of the dial device 7, and detecting an overcurrent And a current transformer 10 that outputs a detection signal to the dial device 7.

  Here, the dial device 7 can set not only the rated current of the circuit breaker 100 and the operating conditions of the actuator 8 but also various parameters for operating and controlling the device in which the dial device 7 is installed. Data can be input by dial operation. However, the dial device 7 for setting the operating conditions of the actuator 8 based on the detected overcurrent as in the present embodiment is generally called an overcurrent detection setting unit in order to clarify the function and purpose. There are many. Hereinafter, in this specification, the dial device 7 for setting the operating condition of the actuator 8 based on the overcurrent is basically referred to as the overcurrent detection setting unit according to a general name.

  In the present embodiment, the opening / closing mechanism 5 employs a so-called single-pole / single-point configuration having one movable contact 11 and one fixed contact 12. That is, when the opening / closing mechanism unit 5 opens and closes, the movable contact 13 having one movable contact 11 rotates around the end opposite to the movable contact 11. On the other hand, a fixed contact 14 having one fixed contact 12 is arranged on the device base 1, and one fixed contact 12 and a movable contact 13 formed on the fixed contact 14 are formed by rotation of the movable contact 13. The one movable contact 11 formed above opens and closes, and performs current supply / interruption.

  The shut-off operation of the opening / closing mechanism unit 5 having the single-pole / single-point cut-off structure is performed when the operation handle 15 is manually operated, when an excessive current such as a short-circuit accident flows and the trip device 6 operates, and This occurs when the overcurrent detection setting unit 7 detects an overcurrent based on the detection signal from the switch 10 and the trip bar 16 is driven via the relay 9.

  The operation handle 15 for manually opening and closing the movable contact 11 and the fixed contact 12 is disposed so as to protrude from a rectangular hole formed in the apparatus cover 2. Further, an overcurrent detection setting unit 7 is formed adjacent to the operation handle 15. As will be described later, the overcurrent detection setting unit 7 has a plurality of dials 17, rotates the rotary switch 18 in synchronization with the rotation of the dial 17, and operates the time limit characteristic of the circuit breaker 100 when overcurrent is detected. Is set.

  Note that the arrangement of the holes for the operation handle 15 and the overcurrent detection setting unit 7 formed on the apparatus cover 2 is shown as an example, and any configuration and arrangement having the same function can be used. As described above, the rotary switch 18 includes a rotary variable resistor 19 and a rotary circuit switch 20, and indicates a member that can switch a resistance or a circuit connection.

Next, the configuration of the dial device 7 of the present invention will be described with reference to FIGS. 6 and 7, taking the configuration of the overcurrent detection setting unit 7 used in the present embodiment as an example.
FIG. 6 is a plan view of the overcurrent detection setting unit 7, and FIG. 7 is a perspective view showing the overcurrent detection setting unit 7 disassembled into a unit cover 21 and a unit case 22 and assembled.

  In the figure, the overcurrent detection setting unit 7 mainly includes a unit case 22, an electronic circuit unit 23, a unit cover 21, and a dial 17. The electronic circuit section 23 is housed in the unit case 22. The rotary switch 18 (as described above, the rotary variable resistor 19, A CPU (not shown) for driving the actuator 8 based on the detection signal detected by the current transformer 10 and the setting of the operation time characteristic by the rotary switch 18; A dial 17 is arranged on the rotary switch 18. An overcurrent detection setting unit 7 is configured by disposing a unit cover 21 having a round hole 24 formed in a portion corresponding to the dial 17 so as to cover the electronic circuit unit 23.

  The dial 17 is arranged on the rotary switch 18. As will be described later, the lower surface of the dial 17 has a fitting portion 28 that fits with the combination portion 31 on the upper surface of the rotary switch 18. When the dial 17 is rotated, the rotation mounted on the electronic circuit portion 23 is performed. The expression switch 18 can be rotated in synchronization, and setting for overcurrent can be performed. In order to fit with the combination part 31 on the upper surface of the rotary switch 18, the fitting part 28 and the combination part 31 generally have complementary shapes, but in synchronization with the rotation of the dial 17. Any shape may be used as long as the rotary switch 18 can be rotated to such an extent that the rotary switch 18 can be rotated, and it is not limited that one of the shapes has a convex shape and the other has a concave shape.

  Further, in the present embodiment, for example, a scale is provided on the upper surface of the dial 17, that is, the surface that can be observed from the outside with the unit cover 21 disposed with the dial 17 attached to the overcurrent detection setting unit 7. Alternatively, an arrow is formed by engraving or printing, and an arrow or a scale is similarly formed on the front surface of the unit cover 21, particularly around the round hole 24 formed corresponding to the dial 17. Thereby, the rotation amount and the angle of the dial 17 can be grasped, and the setting of the condition for the overcurrent can be quantitatively managed.

  8 to 14 show the shape of the dial 17 used in the present embodiment in detail. 8 and 9 are a plan view and a side view, respectively, of the dial 17, FIG. 10 is a cross-sectional view of the YY portion shown in FIG. 8, and FIGS. 11 and 12 are perspective views of the dial 17. 13 is a perspective view of a unit cover 21 constituting the overcurrent detection setting unit 7, and FIG. 14 is a sectional view of the dial 17 shown in FIG.

  The dial 17 has a cylindrical knob portion 25 on the front portion, and a mating portion 31 on the upper surface of the rotary switch 18 (rotary variable resistor 19 or rotary circuit switch 20) on the rear portion. It has a fitting portion 28 for fitting. On the outer peripheral portion of the knob portion 25 of the dial 17, an arm portion 29 extending in the outer peripheral direction of the knob portion 25 is formed. The arm portion 29 has a connecting portion 27 fixed to the outer peripheral portion of the knob portion 25 at one end, and a projection 26 projecting toward the surface of the dial 17 at the other end.

  FIG. 13 is a perspective view for observing the inner surface of the unit cover 21. A round hole 24 corresponding to the knob 25 of the dial 17 is formed in the unit cover 21. FIG. 14 is a cross-sectional view taken along the line Z-Z in FIG. 6, in which a peripheral convex portion 30 for attaching and holding the dial 17 around the round hole 24 is formed. Since the peripheral convex portion 30 is provided around the round hole 24, the protrusion 26 formed on the arm portion 29 of the dial 17 comes into contact with the peripheral convex portion 30.

  When the unit case 22 is assembled by incorporating the dial 17 and the like, the projection 26 of the arm 29 is brought into contact with the peripheral projection 30 of the unit cover 21, and the projection 26 is pressed in a direction to push up the unit cover 21. It is fixed and arranged.

  In the present embodiment, only one end of the arm portion 29 is fixed to the outer peripheral portion of the cylindrical knob portion 25 via the connecting portion 27, and the other portion of the arm portion 29 does not contact the outer peripheral portion. By arranging a portion other than one end (connecting portion 27) of the arm portion 29 away from the outer peripheral portion in this manner, the arm portion 29 has elasticity. The portion where the projection 26 of 29 and the unit cover 21 are in contact with each other can be pressed strongly. Therefore, the fitting portion 28 on the back surface of the dial 17 can strongly press the combination portion 31 of the rotary switch 18 mounted on the electronic circuit portion 23, and the rotation of the dial 17 can be surely performed without idling. It can be transmitted to the expression switch 18.

  In the present embodiment, the length of the arm 29 is about １ ／ of the outer circumference of the cylindrical knob 25, and two arms 29 are used for one dial 17; The present invention is not limited to this, and the length of the arm 29 and the number of the arms to be used are variously combined, such as using four arms 29 with the length of the arm 29 being about ４ of the outer circumference. Can be set.

  Further, in the present embodiment, the direction in which the arm portion 29 winds the cylindrical knob portion 25 is set to be the same in all the arm portions 29. However, the present invention is not limited to this. The direction in which the plurality of arm portions 29 disposed on the dial 17 wind the knob portion 25 may be a mixture of right-handed and left-handed winding.

  By assembling the unit cover 21 and the unit case 22 using the dial 17 having the above-described configuration, the protrusion 26 of the arm 29 formed on the knob 25 of the dial 17 presses the unit cover 21, The dial 17 and the rotary switch 18 (the rotary variable resistor 19 or the rotary circuit switch 20) can be fitted sufficiently firmly. For this reason, the rotation of the dial 17 is idle and the rotary switch 18 is rotated without a gap being formed between the fitting portion 28 of the dial 17 and the combination portion 31 of the rotary switch 18 due to variations in parts dimensions or the like. Can not be done.

Embodiment 2 FIG.
In the present embodiment, all the other components are the same as the overcurrent detection setting unit 7 and the circuit described in the first embodiment except that the form of a part of the unit cover 21 constituting the overcurrent detection setting unit 7 is different. The configuration is the same as that of the circuit breaker 100.

  FIG. 15 shows a perspective view of the unit cover 21 used in the present embodiment. FIG. 16 is a partially enlarged perspective view of FIG. 15, and FIG. 17 shows the internal structure of the overcurrent detection setting unit 7 of the present embodiment. The present embodiment has a feature in a portion where the uneven portion 32 is formed in the peripheral convex portion 30 formed around the round hole 24 of the unit cover 21.

  In the overcurrent detection setting unit 7 in which the concave and convex portions 32 are formed on the peripheral convex portion 30 of the unit cover 21, the idle rotation of the dial 17 can be prevented, and at the same time, a click feeling can be obtained when the dial 17 is operated. The rotary switch 18 (rotary variable resistor 19, rotary circuit switch 20) mounted on the electronic circuit unit 23 is easily adjusted to a predetermined set value. In addition, it is possible to prevent the dial 17 from rotating unnecessarily due to vibration or impact, thereby preventing the setting state from changing.

Embodiment 3 FIG.
The circuit breaker 100 described in the present embodiment has the same basic configuration as the circuit breaker 100 described in the first embodiment, but the switching mechanism 5 of the circuit breaker 100 described in the first embodiment. In contrast, in the switching mechanism unit 5 of the circuit breaker 100 described in the present embodiment, the current is turned on / off between a pair of contacts. The difference is that it has a pole two-point structure.

  FIG. 18 shows only a contact portion of the switching mechanism 5 of the circuit breaker 100 described in the present embodiment, and FIG. 18A shows a single-pole, single-point contact used in the first embodiment. FIG. 18B shows a so-called single-pole two-point structure in which current supply / disconnection described in the present embodiment is performed between two sets of contacts. In the single-pole two-point structure, a substantially cylindrical rotor 33 that rotates due to the movement of the operation handle 15 is arranged between the power supply side connection terminal 4 and the load side connection terminal 3. A first movable contact 34 on the right side in the drawing and a second movable contact 35 on the left side in the drawing protruding from the outer periphery of the rotor 33 are provided at substantially diagonal positions with the cylindrical rotor 33 interposed therebetween. A first movable contact 36 is formed in the vicinity of the tip of the movable contact 34, and a second movable contact 37 is formed in the vicinity of the tip of the second movable contact 35 to form a rotating electrode 38. . On the other hand, a first fixed contact 39 is connected to the power supply side connection terminal 4 of the circuit breaker 100 main body, and a first fixed contact 40 is formed on the surface. A second fixed contact 41 is connected from the load-side connection terminal 3, and a second fixed contact 42 is formed on the surface.

  When the rotor 33 rotates due to the movement of the operating handle 15, the first fixed contact 40 on the first fixed contact 39 and the first movable contact 36 on the first movable contact 34, the second movable contact 36, The second fixed contact 42 on the fixed contact 41 and the second movable contact 37 on the second movable contact 35 are simultaneously closed or opened. As a result, it is possible to supply / disconnect a current between the power supply side connection terminal 4 and the load side connection terminal 3.

  In the present embodiment, the switching mechanism unit 5 employs a one-pole two-point cutting structure and simultaneously opens and closes two sets of electrodes. Therefore, the structure is slightly more complicated than the circuit breaker 100 having the one-pole one-point cutting structure. However, it has the characteristics that it has excellent breaking characteristics and can be applied to products with high breaking capacity. Further, using the overcurrent detection setting unit 7 of the present invention shown in the first embodiment, the rotation of the dial 17 is not caused to idle to the rotary switch 18 (the rotary variable resistor 19 or the rotary circuit switch 20). Regarding the effect of being able to convey, even in the case of the circuit breaker 100 using the switching mechanism unit 5 having the single-pole two-point structure shown in the present embodiment, the switching mechanism unit 5 having the single-pole single-point structure may be used. In the same manner, the circuit breaker 100 using the same can be performed, and the circuit breaker 100 having good characteristics can be obtained.

1 Device base, 2 Device cover, 3 Load side connection terminal, 4 Power supply side connection terminal, 5 Opening / closing mechanism, 6 Tripping device, 7 Dial device (Overcurrent detection setting unit), 8 Actuator, 9 Relay, 10 Current transformer , 11 movable contacts, 12 fixed contacts, 13 movable contacts, 14 fixed contacts, 15 operating handles, 16 trip bars, 17 dials, 18 rotary switches, 19 rotary variable resistors, 20 rotary circuit switches, 21 unit cover, 22 unit case, 23 electronic circuit part, 24 round hole, 25 knob part, 26 protrusion, 27 connection part, 28 fitting part, 29 arm-shaped part, 30 peripheral convex part, 31 combination part, 32 uneven part , 33 rotor, 34 first movable contact, 35 second movable contact, 36 first movable contact, 37 second movable contact, 38 Rotating electrode, 39 first fixed contact, 40 first fixed contact, 41 second fixed contact, 42 second fixed contact, 100 circuit breaker.

Claims (5)

A rotary switch stored in the unit case,
It is disposed on the rotary switch, has a cylindrical knob portion, and extends circumferentially along the outer peripheral portion of the knob portion, one end is fixed to the outer peripheral portion of the knob portion, and the other end is directed upward. An arm-shaped portion having a projection, and a dial having a fitting portion on the lower surface for fitting the rotary switch,
A round hole is formed through the knob portion of the dial, and a unit cover fits with the unit case.
Pressing the unit cover with the protrusion formed on the arm portion of the dial ,
The dial device , wherein the arm-shaped portion is arranged on an outer peripheral portion of the knob portion and is divided into two or more in a circumferential direction . A rotary switch stored in the unit case,
It is disposed on the rotary switch, has a cylindrical knob portion, and extends circumferentially along the outer peripheral portion of the knob portion, one end is fixed to the outer peripheral portion of the knob portion, and the other end is directed upward. An arm-shaped portion having a projection, and a dial having a fitting portion on the lower surface for fitting the rotary switch,
A round hole is formed through the knob portion of the dial, and a unit cover fits with the unit case.
Pressing the unit cover with the protrusion formed on the arm portion of the dial,
The arm portion includes features and to holder dial device that only the connection portion formed on the one end in contact with the outer peripheral portion of the handle portion. The arm-like portion disposed adjacent to the dial device according to the outer peripheral portion of the handle portion, to claim 1 or 2, characterized in that wound in the same direction to each other. The dial device according to any one of claims 1 to 3 , wherein an uneven portion is formed in a portion of the unit cover that contacts the protrusion formed on the arm-shaped portion. And the device base,
Device cover,
A plurality of load-side connecting terminal formed on the front and rear of the device base and a plurality of power source side connection terminal,
An opening / closing mechanism that is arranged in the device base and opens and closes electrical contacts;
A current transformer for detecting a current flowing through the electrical contact;
It has the dial device according to any one of claims 1 to 4 ,
A circuit breaker, wherein the dial device is an overcurrent detection setting unit that drives the switching mechanism based on a signal detected by the current transformer.

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