JPH02257604A - Voltage tripping device - Google Patents

Abstract

PURPOSE:To stabilize an attraction force of a plunger and to make this apparatus small-sized and to lower cost by a method wherein a recessed part (protruding part) which is coupled to a protruding part (recessed part) of a bobbin is installed at a yoke and the bobbin and the yoke are positioned by using this protruding part (recessed part). CONSTITUTION:In order to restrain that a bobbin 2 on which an exciting coil 1 has been wound and a yoke 5 are slid and moved, protruding parts 13 (or recessed parts) are formed at the bobbin 2 and recessed parts 14 (or protruding parts) to which the protruding parts 13 (or recessed parts) of the bobbing 2 are coupled are formed at the yoke 5. When the bobbing 2 is coupled surely to the yoke 5, it is possible to prevent plunger through-holes 2a, 5a from being displaced and to reduce friction between a plunger and the plunger through-holes 2a, 5a when the plunger is slid and moved; an attraction force of the plunger by the exciting coil is improved. Thereby, it is possible to stabilize and improve the attraction force of the plunger by using a small-sized apparatus, without increasing the number of components and without a need for a special magnetic material and a processing operation of specially high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a voltage tripping device for a circuit breaker.

[Conventional technology]

FIG. 5 shows an exploded perspective view of a conventional voltage trip device. As shown in the figure, in the conventional device, an excitation coil 1 is wound around a bobbin 2 made of synthetic resin.
An iron plunger 4 made of a round bar cut into small pieces and an anvil 3 are inserted into the center penetration 1 and 2a of the plunger. The anvil 3 is fixed to one side of a yoke 5 surrounding at least three sides of the bobbin 2 and the excitation coil 1, and the plunger 3 extends through a plunger through hole 5a provided on the other side of the yoke 5, and the plunger 3 extends from the end far from the anvil 3. The portion 4a is located on the outside of the yoke 5. A return spring 7 is mounted between this end 4a of the plunger and the yoke 5, so as to resist the force of attraction of the plunger 4 to the anvil 3. 9 is a lead wire for feeding power to the excitation coil 1. The plunger 4 further has a flange 4b at the tip of the end 4a, and as described later,
This collar portion 4b is adapted to engage with the trip bar 12 of the circuit breaker, and is provided with a stopper 12a that comes into contact with the end portion 4a.

The detected voltage signal taken in from the outside of the zero-circuit breaker, the operation of which will be explained next, is supplied to the exciting coil 1 through the lead wire 9, and the flowing current causes a magnetic path that forms a closed loop between the yoke 5, anvil 3, and plunger 4. is formed, and the plunger 4 is attracted to the anvil 3 by the action of a known electromagnet. When the suction force exceeds the predetermined load of the return spring 7, the plunger 4 moves to the left in the figure and is attracted to the anvil 3. The flange 4b at the end of the plunger 4 operates the tripping lever 12 to perform a predetermined tripping operation,
When the voltage signal disappears, the plunger 4 returns to the position where the end portion 4a contacts the stopper 12a due to the loading of the return spring 7. Here, the tripping lever is reset by a reset mechanism of the circuit breaker.

[Problems to be Solved by the Invention] The excitation coil of the conventional tripping device as described above has a limited power supply time, and must operate reliably at a specified operating voltage within the power supply time. There were problems such as a drop in operating voltage due to friction on the plunger due to sliding between the bobbin and the yoke on which it was wound, and burnout of the excitation coil.

In order to increase the suction force, it is necessary to reduce the diameter of the plunger through-hole as much as possible to reduce the gap between the peripheral wall of the hole and the plunger, but even then, a sufficient increase cannot be expected, especially for small circuit breakers. When mounting, it is difficult to obtain the necessary adsorption force, and to compensate for this, special precision is required in the processing of the parts, or it is necessary to use a special magnetic material, which is cumbersome to process and difficult to shape. There were problems such as the increase in size and economic disadvantage. That is, as shown in FIG. 6, the sliding and movement of the bobbin 2 and the yoke 5 causes a misalignment between the plunger through holes 2a and 5a, which obstructs the movement of the plunger 4 and causes the plunger 4 to wear out. There was a problem.

This invention was made to solve the above-mentioned problems.It is compact, does not require an increase in the number of parts, does not require special magnetic materials or particularly high-precision machining, and has the ability to improve the attraction force of the plunger. The purpose is to stabilize the voltage and obtain an improved voltage tripping device.

[Means to solve the problem]

The voltage tripping device according to the present invention has a protrusion (or recess) on the bobbin and a protrusion (or recess) of the bobbin on the yoke so as to suppress sliding between the bobbin around which the excitation coil is wound and the yoke. It is provided with an engaging recess (or protrusion).

[Effect]

The voltage tripping device for this action prevents the displacement of the plunger through hole by securely securing the bobbin and yoke, and reduces the friction between the plunger and the plunger through hole when the plunger slides. This improves the attraction force of the plunger.

〔Example〕

FIG. 1 is an exploded perspective view of an embodiment of the present invention. As shown in the figure, a protrusion 13 is provided on a bobbin 2 around which an excitation coil 1 is wound, and a yoke 5 through which a plunger 4 is passed is provided with a protrusion 13. In order to suppress vertical and horizontal sliding, a recess 14 that engages with the protrusion 13 of the bobbin 2 is provided, and the bobbin 2 is urged against the yoke 5 in the direction of arrow (A) by the action of the leaf spring 15. .

Since the other constituent parts are the same as those of the conventional device shown in FIG. 5, the same or equivalent parts are given the same reference numerals and the explanation thereof will be omitted.

The tripping operation of the voltage tripping device in this invention is the fifth
The operation is quite similar to that of the conventional device described above with respect to the figures. FIG. 2 shows the entire tripping device shown in FIG. 1, in which a predetermined voltage signal is applied to the excitation coil 1, the plunger 4 is attracted to the anvil 3, and the collar 4b operates the tripping lever 12 to the tripping position. This shows the state in which the FIG. 3 shows a state in which the voltage signal has disappeared, the plunger 4 has been returned by the return spring 7, and the tripping lever 12 has been reset.

The operation of the structure for engaging the bobbin and yoke, which is a feature of this invention, will be explained. As shown in FIG. 6, the conventional one has plunger through holes 2a and 5 in the bobbin 2 and yoke 5.
The sliding of the plunger was hindered by the misalignment of point a. In contrast, in the present invention, as shown in FIG. 4, by engaging the yoke recess 14 and the bobbin protrusion 13, positioning can be easily performed, and wear on the plunger can be reduced. It can increase the effect of suction power.

In the above embodiments, the protrusion 13 is provided on the outside of the bobbin, but the protrusion 13 is provided on the inside of the yoke (bobbin (I).
A similar effect can be obtained even if the projection is made to protrude at l>.

〔Effect of the invention〕

As described above, according to the present invention, since the bobbin and the yoke are configured to engage with each other, the attraction force of the plunger is stabilized and
An improved voltage tripping device that is compact and inexpensive can be obtained.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing an embodiment of the present invention, Figs. 2 and 3 are side views of an embodiment of the invention, Fig. 2 shows the tripped state, and Fig. 3 shows the returned state. 4 is a front view showing a combination of a bobbin and a yoke according to an embodiment of the present invention, FIG. 5 is an exploded perspective view showing a conventional voltage tripping device, and FIG. 6 is a diagram showing a conventional bobbin and yoke. FIG. 3 is a front view showing a state in which the yokes are combined. In the figure, 1 is an exciting coil, 2 is a bobbin, 2a is a through hole, 3
is an anvil, 4 is a plunger, 4a is an end, 4b is a flange, 5 is a yoke, 5a is a through hole, 7 is a return spring, ! 2 is a tripping lever. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] An excitation coil, a bobbin around which this excitation coil is wound,
An anvil and a plunger are inserted into the through-center hole of the bobbin, the anvil is fixed to one side, and the other side has a plunger through-hole through which the plunger is inserted, forming a magnetic path together with the anvil and plunger. In a voltage tripping device comprising a yoke combined with the bobbin and a return spring that resists the attraction force of the plunger, the bobbin has a protrusion (or recess), and the yoke has a protrusion of the bobbin. 1. A voltage tripping device characterized in that a recess (or protrusion) that engages with the bobbin (or recess) is provided, and the protrusion and recess are used to position the bobbin and the yoke.