JPH0142281Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention uses multiple single-pole circuit breakers arranged in parallel,
It is a thermal electromagnetic type multi-pole circuit and disconnector in which the operation handles are connected to each other, and it prevents abnormal voltage from occurring especially when opening and closing.

[Conventional technology]

A conventional multi-pole circuit breaker of this type will be explained with reference to FIG. In the figure, 1 is a case made of an insulating material, 2 is an operation handle protruding from the case 1, and 3 is a case made of an insulating material.
is a power supply terminal and has a fixed contact 4. 5 is a load terminal to which a bimetal 6 is connected. 7 is a contact arm that is swingably connected to the base of the operating handle 2, 8 is a movable contact provided at the tip of the contact arm 7, 9 is a lead wire that connects the contact arm 7 and the bimetal 6, and 10 is the bimetal 6 The armature is provided in parallel with the armature, the center portion of which is rotatably supported by a support piece 11, and the U-shaped end portion 10a engaged with the tip of the bimetal 6. Reference numeral 12 indicates a reset spring for the armature 10, and reference numeral 13 indicates a lever approximately in the shape of an inverted U. One end of the lever is pivotally connected to the case 1 by a pin 14, and the other end is removably engaged with a hole 15 of the armature 10. 16 is an opening/closing spring whose one end is attached to the mounting hole 17 of the lever 13 and the other end is attached to the center of the contact arm 7; 18 is a protrusion that engages with the lever 13 provided at the base of the operating handle 2; and 19 is a bimetal 6. The iron piece 20 provided at is an adjustment screw for adjusting the moving point of the bimetal 6.

Next, the operation will be explained. The current path from the power supply terminal 3 to the load terminal 5 is: power supply terminal 3 - fixed contact 4 - movable contact 8 - part of contact arm 7 -
It is formed by a lead wire 9, a bimetal 6, and a load terminal 5. In response to a gradually increasing overcurrent, the bimetal 6 is displaced and the armature 10 is rotated, causing the lever 13 to come off the hole 15. In addition, in response to a rapidly increasing overcurrent, the iron piece 19 attracts the armature 10 and rotates. By doing so, the lever 13 is removed from the hole 15. Lever 13 is in hole 1 of armature 10
5, the opening/closing spring 1 is removed as shown in FIG.
Since the attachment hole 17 for the lever 13 of the contact arm 7 moves to the right side in the figure from the contact arm 7, the opening/closing spring 16 snaps the contact arm 7 to the open position, and the movable contact 8 separates from the fixed contact 4. At this time, the operating handle 2 stands up due to the balance between the opening/closing spring 16 and the contact arm 7, and the protrusion 18 engages with the lever 13 (see FIG. 5). After this,
When the operating handle 2 is moved to the "open" position (on the right side in the figure), the protrusion 18 moves to the lever 1 as shown in FIG.
Since lever 13 is pushed up, armature 1
It is engaged with the hole 15 of 0 and returns to its original position.

In the state shown in FIG. 4, the operating handle 2 is in the "closed" position (on the left side in the figure), and the mounting hole 17 of the opening/closing spring 16 is on the left side in the figure with respect to the contact arm 7. 7 is attracted to the left in the figure, and the movable contact 8 is in contact with the fixed contact 4. Now, when the operating handle 2 is moved to the "open" position, the base end of the contact arm 7 is moved by the base of the operating handle 2, as shown in FIG. , so that the opening/closing spring 16 snaps the contact arm 7 into the open position and the movable contact 8 separates from the fixed contact 4.

The above explained the circuit breakers for one pole, but in a three-pole circuit break in a single-phase three-wire circuit, there are three single-pole circuit breakers, and in a three-phase four-wire circuit, there are three. In the four-pole circuit breakers, four single-pole circuit breakers are arranged side by side, and the operating handles 2 of each circuit breakers are integrally connected.

For example, in a 4-pole circuit/breaker, as shown in Figure 7, the voltage pole circuit/breaker has three poles: a center pole C, a left pole L, and a right pole R. The circuit has one pole and a circuit breaker N. The voltage pole circuit and circuit breakers C, L, and R have the configuration shown in FIG. 4 described above, and the neutral pole circuit and circuit breaker N has the configuration shown in FIG. 8. In Fig. 8, 21 is a copper plate connected to the load terminal 5, which serves as a voltage pole circuit and a disconnector C,
It is installed in place of the bimetal 6 of L and R. The same parts as those of the voltage pole circuit and circuit breakers C, L, and R are given the same reference numerals, and the explanation thereof will be omitted. In this way, the bimetal 6 and the iron piece 19 are connected to the neutral pole circuit and the breaker N.
In other words, it does not have an overcurrent detection section.

Therefore, in the neutral pole circuit breaker N shown in FIG. 8, when an overcurrent occurs, the copper plate 21 and the lever 13 are pushed apart by the adjacent voltage pole circuit breaker R, so that the lever 13 is opened. 13 works. The structure of the linking mechanism for the two circuits and disconnectors N and R is well known, for example, from the technique disclosed in Japanese Utility Model Application Laid-Open No. 54-57367, so a description thereof will be omitted.

[Problem that the invention attempts to solve]

In the conventional multi-pole circuit breakers and breakers as described above, the position of the mounting hole 17 of the lever 13 is the same for all pole circuit breakers and breakers, and the movable contacts 8 of all pole circuit breakers and breakers are connected at the same time. However, due to errors in the accuracy of the circuits and disconnectors of each pole, and non-uniformity of the opening/closing spring 16, all poles cannot be opened and closed completely at the same time, resulting in circuits and disconnections of certain poles. In some cases, the movable contact 8 may open early or close late. If the movable contact 8 breaks early and enters late, the neutral pole circuit or breaker N in the 4-pole circuit or breaker mentioned above is the neutral pole circuit. The movable contact 8 of the line breaker N connects to another voltage pole circuit line breaker C,
It opens earlier or closes later than the L and R movable contacts 8. That is, a phenomenon called neutral wire disconnection occurred, resulting in a problem that an abnormal voltage was generated in the load.

This invention was made to solve this problem, and has a simple structure in which the opening/closing spring is attached to the lever at different positions for the neutral pole and the voltage pole. To obtain a multi-pole circuit breaker capable of preventing the occurrence of abnormal voltage by making the movable contact of the voltage pole circuit breaker enter earlier and disconnect later than the movable contact of the voltage pole circuit breaker.

[Means for solving problems]

The multi-pole circuit breaker according to this invention has a neutral pole circuit so that the movable contact of the neutral pole circuit breaker enters earlier and disconnects later than the movable contact of the voltage pole circuit breaker. The attachment position of the opening/closing spring to the lever in the disconnector is different from the attachment position of the opening/closing spring to the lever in the voltage pole circuit or disconnector.

[Effect]

In this invention, the attachment position of the opening/closing spring to the lever in the neutral pole circuit/disconnector is different from the attachment position of the opening/closing spring to the lever in the voltage pole circuit/disconnector. The movable contact of the voltage pole circuit and disconnector enters earlier and breaks later than the movable contact of the voltage pole circuit and disconnector, and the neutral line is not disconnected.

〔Example〕

FIG. 1 is a cross-sectional view of a neutral pole circuit breaker showing an embodiment of this invention.
4 to 16, 18, 20, and 21 are completely the same as the above-mentioned conventional device. 13A is the conventional lever 13
Similarly, one end is pivotally connected to the case 1 by a pin 14, and the other end is connected to the armature 10.
It is removably engaged with the hole 15 of. 17A, 17
B is a mounting hole for the opening/closing spring 16 provided on the lever 13A, and is predetermined so as to be lined up on the left side of the contact arm 7 in the state shown in FIG.

As shown in FIG. 1, the opening/closing spring 16 is attached to the attachment hole 17A in the neutral pole circuit and disconnector N. Although not shown, the voltage pole circuit and disconnectors C, L, and R
Here, the opening/closing spring 16 is attached to the attachment hole 17B.

Therefore, when the contact arm 7 swings and the movable contact 8 separates from the fixed contact 4, the opening/closing spring 16 attached to the mounting hole 17B near the contact arm 7 (voltage pole circuit and disconnectors C, L, R) ) acts faster than the opening/closing spring 16 (neutral circuit disconnector N) installed in the farthest mounting hole 17A and snaps the contact arm 7 earlier, so the neutral circuit disconnector N The movable contact 8 of the voltage pole circuit disconnects later than the movable contacts 8 of the circuit breakers C, L, and R.

FIG. 2 shows a state in which the operating handle 2 has moved to the "open" position from FIG. 1 and the movable contact 8 has separated from the fixed contact 4. In this open state, when the contact arm 7 swings and the movable contact 8 comes into contact with the fixed contact 4, the mounting hole 17A near the contact arm 7
The opening/closing spring 16 attached to the mounting hole 17B (neutral pole circuit breaker N) is the one installed in the mounting hole 17B (voltage pole circuit breaker C, L,
R) and snaps the contact arm 7 earlier, so that the movable contact 8 of the neutral pole circuit and disconnector N is connected to the voltage pole circuit and disconnectors C, L, and R.
It engages earlier than the movable contact 8.

In the above embodiment, the lever 13A has two mounting holes 17A and 17B as shown in FIG. Can be shared with C, L, and R. Furthermore, separate levers each having one mounting hole 17A, 17B may be prepared and used for different purposes.

[Effect of idea]

As explained above, this device has a simple structure in which the mounting position of the opening/closing spring on the lever of the neutral pole circuit/disconnector is different from the mounting position of the opening/closing spring on the lever of the voltage pole circuit/disconnector. As a result, the movable contact of the neutral pole circuit or disconnector can be turned on earlier and turned off later than the movable contact of the voltage pole circuit or disconnector, which has the effect of preventing the occurrence of abnormal voltage.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a neutral pole circuit breaker showing an embodiment of this invention, Fig. 2 is a main part view showing a changed state of Fig. 1, Fig. 3 is a side view of the lever,
Figure 4 is a cross-sectional view of a conventional voltage pole circuit and circuit breaker, Figures 5 and 6 are main part views showing changed states of Figure 4, and Figure 7 is a 4-pole circuit diagram. FIG. 8 is a front view showing the disconnector, and FIG. 8 is a sectional view showing the neutral pole circuit of FIG. 7 and the disconnector. In the figure, C, L, and R are voltage pole circuit breakers, N is neutral pole circuit breakers, 1 is a case, 2 is an operating handle, 3 is a power terminal, 4 is a fixed contact, and 5
is a load terminal, 7 is a contact arm, 8 is a movable contact, 10 is an armature, 13A is a lever, 15
16 is a hole, 16 is an opening/closing spring, 17A and 17B are mounting holes, and 21 is a copper plate.

Claims (1)

[Claims for Utility Model Registration] (1) A contact arm having a movable contact and operated by an operating handle, a lever that is activated in the event of an overcurrent, and a a voltage pole circuit breaker having an opening/closing spring that snaps the contact arm to an open/close position when the operating handle is operated and snaps the contact arm to the open position when the lever is operated; and a movable contact. and a contact arm that is operated by the operating handle, a lever that is operated by the voltage pole circuit breaker or disconnector in the event of an overcurrent, and between this lever and the contact arm, the contact arm is operated when the operating handle is operated. a neutral pole circuit and a disconnector having an opening/closing spring that snaps into the open/close position and snaps the contact arm into the open position when the lever is actuated; and the operating handles of each pole are connected to each other. In a multi-pole circuit breaker, the neutral pole circuit breaker is configured such that the movable contact of the neutral pole circuit breaker enters earlier and breaks later than the movable contact of the voltage pole circuit breaker. A multi-pole circuit breaker, characterized in that the mounting position of the opening/closing spring to the lever in the circuit breaker is different from the mounting position of the opening/closing spring to the lever in the voltage pole circuit breaker. (2) The multi-pole circuit breaker according to claim 1, wherein the lever is provided with two mounting holes at different positions for mounting opening/closing springs.