KR100773318B1 - Accessory-switch device for circuit breaker - Google Patents

Abstract

An object of the present invention is to improve the actuator structure of an accessory switch without the repulsive force from the accessory switch in the input state of the circuit breaker lowering the contact pressure of the main contact.

According to the present invention, the auxiliary switch (attached switch) 11 mounted on the circuit breaker includes a micro switch 15 and a main lever in which the tip of the lever is replaced with the movable contact 5 of the circuit breaker as an actuator lever. 18) and the auxiliary lever 19 in which the main lever 18 is replaced with a fulcrum position, and the tip of the lever is inserted between the main lever 18 and the actuator 15a of the micro switch 15 to be mounted. It is set to change the operating point and the engagement angle between the main lever and the auxiliary lever before and after the switching operation of the auxiliary switch, and apply from the micro switch to the main lever through the auxiliary lever during the closing operation of the circuit breaker. A subsidiary switch acting in the direction of decreasing the contact pressure acting on the main contact of the circuit breaker body by changing the losing force vector from the direction of P to Q before and after the switching operation of the micro switch. It suppresses the repulsion from small.

Description

Auxiliary switch device for circuit breaker {ACCESSORY-SWITCH DEVICE FOR CIRCUIT BREAKER}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory view of the structure and operation of an accessory switch corresponding to Embodiment 1 of the present invention, in which Figs. 1A and 1B show the states before and after the switch switching operation, respectively. .

FIG. 2 is an operation characteristic diagram showing a relationship between an actuator stroke and a movable contact load by the accessory switch of FIG. 1; FIG.

3 is a configuration diagram of an accessory switch (auxiliary switch) corresponding to Embodiment 2 of the present invention, and FIGS. 3A and 3B are side and front views of the accessory switch, and FIG. And (d) of FIG. 3 is a side view and a front view of an alarm switch, and FIG. 3 (e) is a front view of a state in which an accessory switch and an alarm switch are connected.

4 is a cross-sectional view of a circuit breaker mounted with the accessory switch of the present invention.

FIG. 5 is a partial plan view of the circuit breaker of FIG. 4 shown with an accessory switch and an accessory terminal block mounted on the circuit breaker. FIG.

Fig. 6 is an explanatory diagram of a structure and operation schematically showing a conventional auxiliary switch (auxiliary switch), and Figs. 6 (a) and 6 (b) are states before and after the switch switching operation, respectively. Drawing showing.

7 is an operation characteristic diagram showing a relationship between an actuator stroke and a movable contact load by the attached switch of FIG. 6;

<Explanation of symbols for main parts of drawing>

1: breaker case

3: cover

3a: recess

5: operation contactor

11: auxiliary switch (supplied switch)

12: alarm switch (supplied switch)

11a, 12a: case

11b, 12b: Lead wire through groove

11c, 12c: opposite ear

13: lead wire

15: micro switch

15a: Actuator of micro switch

18: main lever of the actuator lever

18a: support shaft of main lever

19: auxiliary lever of the actuator lever

19a: support shaft of auxiliary lever

The present invention is applied to an auxiliary switch device such as an auxiliary switch and an alarm switch that are mounted on the circuit breaker main body, such as an auto-breaker and an earth leakage breaker, to output the operating state of the circuit breaker as an electrical signal to the outside. It is about.

First, the structure of the circuit breaker which becomes the target of implementation of this invention taking the said autobreaker as an example is shown to FIG. 4 and FIG. In FIG. 4, 1 is a circuit breaker case of the resin molded article which combined the case 2 and the cover 3, 4 is a fixed contact integrated with a power supply terminal, 5 is a movable contact, 6 is an opening / closing mechanism, 7 is an operation handle, 8 is an overcurrent tripping device, 9 is a load-side terminal, and the cover 3 has a pocket-shaped recess for storing by placing an accessory switch, described below, left and right as an internal accessory (optional component). A hollow 3a is partitioned, and an auxiliary cover 10 is provided on the upper surface of the recess 3a as an opening and closing lid.

Here, as shown in FIG. 5, in the cover 3 of the circuit breaker case 1, the recessed parts 3a arrange | positioned at fixed pitch space are divided in four places. In addition, 11 is an auxiliary switch as an auxiliary switch (extracting the ON state and the OFF state of the main circuit contact as an electric signal in conjunction with the movable contactor 5 of the circuit breaker), and 12 is an alarm switch (at the time of tripping operation of the circuit breaker). Extract the operation signal to the outside, 13 is a lead wire drawn out to the side from the auxiliary switch 11 and the alarm switch 12, 14 is connected to the lead wire 13 and mounted on the side of the breaker case (1) In the embodiment of Fig. 5, the auxiliary switch 11 and the alarm switch 12 are paired one by one and inserted into and set in the recess 3a disposed on the left side of the circuit breaker case 1, The lead wires 13 are collectively drawn out to the left side of the breaker case 1, and an external signal line is connected to the accessory terminal block 14 to extract the output signals of the auxiliary switch 11 and the alarm switch 12. In addition, depending on the situation where the circuit breaker is installed, the accessory switch 11 and the alarm switch 12 are attached to two recesses 3a disposed on the right side of the breaker case 1 so that the lead wire 13 is attached. It may draw out to the right.

Next, the conventional switch structure and operation will be described with reference to FIGS. 6A and 6B by taking the auxiliary switch 11 as an example. 6 (a) and 6 (b), the auxiliary switch 11 is a micro switch 15 and an L-shaped actuator lever (hereinafter abbreviated as "actuator lever") in the resin case 11a. The end of the actuator lever 16 which consists of the unit which incorporated the 16 and the return spring 17, and protrudes downward from the resin case 11a in the state mounted to the circuit breaker main body 5 (FIG. 4). In addition, 16a is a support shaft used as the swing fulcrum of the actuator lever 16.

In this configuration, when the circuit breaker is in the OFF (or tripping operation) state, the movable contact 5 is retracted from the actuator lever 16 as shown in Fig. 6A, and the micro switch 15 is closed. The actuator (protruding downward from the micro switch) is turned OFF by being pressed by the actuator lever 16 subjected to the spring force of the return spring 17. On the other hand, when the movable contactor 5 moves to the ON position by the closing operation of the circuit breaker, the movable contactor 5 presses the actuator lever 16 as shown in Fig. 6B. As a result, the actuator lever 16 moves inclined clockwise while compressing the return spring 17 so that the tip of the lever retreats from the micro switch 15, and the micro switch 15 is inverted to output this ON signal. do.

The alarm switch 12 also has the same configuration as the auxiliary switch 11 except that the actuator lever has a different shape.

However, in the structure of the conventional accessory switch described above, there are the following problems. In other words,

(1) In the state where the movable contactor 5 has pressed the actuator lever 16 by the closing operation (main contact ON) of the circuit breaker (refer to FIG. 6 (b)), the movable contactor ( The compression spring force of the return spring 17 applied to 5) acts in the direction of pushing and returning the movable contactor 5 as the movable contactor load F, i.e., lowering the contact pressure of the main contact of the breaker body. FIG. 7 is a relationship diagram between the actuator stroke showing this state and the load F acting as a repulsive force on the movable contactor 5 through the actuator lever 16, and the characteristic line A shown in FIG. The change of F) is shown, and as shown from this FIG. 7, a big load F acts on a movable contact in the ON position of a main contact. As a result, the electrical contact resistance between the main contacts increases when the circuit breaker is energized, resulting in abnormal heat generation, and as a result of this, adverse effects such as a rise in the temperature of the circuit breaker, a decrease in the life of the main contact point, and a change in the breaking performance. Crazy

(2) In addition, as described with reference to Fig. 5, in the case of mounting the auxiliary switch 11 and the alarm switch 12 as a set to the breaker main body, conventionally, each switch is separately recessed in the breaker case 1. The lead wire 13 of the alarm switch 12 disposed inside is drawn out to the side of the breaker case 1 beyond the auxiliary switch 11 arranged outside, in addition to the need to be inserted into the portion 3a and set. It is necessary to do this, and processing of this lead wire becomes a problem. Therefore, in the past, when the auxiliary switch 11 and the alarm switch 12 are mounted in pairs, the auxiliary switch 11, the alarm switch 12 and the lead wire 13 are held in the set adapter prepared as a separate component. In one state, the auxiliary switch 11 and the alarm switch 12 together with the set adapter are inserted into the recessed portion 3a of the breaker case to be set together, but an adapter is required separately from the attached switch. Will rise.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and a first object thereof is to improve the actuator structure of the accessory switch so that the contact pressure of the main contact is not reduced by receiving the repulsive force from the accessory switch in the input state of the circuit breaker. An object of the present invention is to provide an accessory switch device for a circuit breaker in which a case of an accessory switch is improved so that work in the case of mounting a plurality of accessory switches on a circuit breaker main body can be easily performed.

The object of the present invention is achieved by the following configuration by the present invention.

(1) An accessory switch device of a circuit breaker comprising a configuration in which a micro switch and an actuator lever are combined, and configured to transfer a movement of the movable contact of the breaker main body to the actuator lever to switch the micro switch.

As the actuator lever, a main lever in which a lever end is replaced with a movable contact of the breaker main body, a fulcrum position is changed with the main lever, and the lever end is disposed between the main lever and the actuator of the micro switch. The auxiliary lever inserted and mounted is combined, and the operating point and the engagement angle between the main lever and the auxiliary lever are set to be changed before and after the operation position of the micro switch, and assisted by the micro switch during the closing operation of the circuit breaker. The vector direction of the return spring force applied in the direction of pushing the main lever back through the lever is changed before and after the switching operation of the micro switch, and the repulsive force acting on the main contact point of the circuit breaker main body is reduced.

In the above configuration, when the movable contactor presses the main lever of the accessory switch during the closing operation of the circuit breaker, in the first half stroke until the micro switch of the accessory switch is switched, the main lever pushes the auxiliary lever from the rear and the actuator of the micro switch. Is driven toward the operating position. In this case, the direction of the vector of the repulsive force (the contact mechanism return spring force of the micro switch) applied to the movable contact from the micro switch via the auxiliary lever and the main lever is almost opposite to the input direction of the movable contact. On the other hand, when the micro switch is pushed to the position of the switching operation, the tip of the auxiliary lever is raised to the tip of the main lever so as to overlap, and the operating point and the engagement angle between the main lever and the auxiliary lever are changed before the micro switch is switched. As a result, the vector direction of the return spring force applied from the micro switch to the main lever via the auxiliary lever becomes substantially orthogonal to the pushing direction of the movable contact, and the force acting in the direction to push the movable contact back through the main lever Decrease sharply. As a result, the problem that the contact pressure of the main contact falls by the repulsive force exerted from the attached switch to the movable contact in the circuit breaker can be prevented.

(2) Further, in order to achieve the second object, according to the present invention, it is inserted into the recessed part for storing the accessory switch partitioned in the circuit breaker case, the lead wires of each accessory switch are collectively drawn out to the side of the circuit breaker case, For an accessory switch to be connected to an external signal line, an insertion type lead wire through groove is provided in the top portion of the case of the accessory switch, and the lead wire of the accessory switch attached to the inner recess is attached to the outer recess. An opposing ear projecting laterally from the upper end of the casing of the accessory switch so as to be collectively drawn out to the side of the circuit breaker case via the through groove of the accessory switch, and to correspond to the arrangement pitch of the recesses partitioned in the circuit breaker case. part) and the adjacent switch when the plurality of attached switches are attached to the circuit breaker main body. The standing the lead wire passes through the grooves of the upper case, the bulk of each sub-switch in the state worked against the marginal portions to each other and configured to be mounted in the recess of the circuit breaker body.

According to this configuration, even when a plurality of auxiliary switches (auxiliary switch and alarm switch) are set in the breaker body, the breakers are attached to each other at their opposite ends and are connected to each other via a lead wire. Since it can be set by inserting into the recessed part of a main body, the attachment operation of an attached switch can be performed easily.

EMBODIMENT OF THE INVENTION Hereinafter, it demonstrates based on the Example which showed embodiment of this invention. In addition, the same code | symbol is attached | subjected to the same member corresponding to FIGS. 4 and 5 in the figure of each Example, The description is abbreviate | omitted.

EXAMPLE 1

FIG. 1 is a configuration diagram of an auxiliary switch (subsidiary switch) corresponding to claim 1 of the present invention. In the auxiliary switch 11 of the embodiment shown in FIG. 1, the actuator switch is combined with the micro switch 15. As shown in FIG. And a main lever 18 and an auxiliary lever 19 in the resin case 11a, and are mounted to the breaker case 1 and the recessed portion 3a partitioned as described in FIG. do.

Here, the opening and closing movement direction of the movable contactor 5 of the circuit breaker main body is the X axis and the direction orthogonal to the X axis is the Y axis, and the micro switch 15 incorporated in the accessory switch 11 is disposed in the Y axis direction. The tip of the actuator 15a connected to the contact mechanism therein is urged to protrude downward by the return spring of the contact mechanism.

Further, the main lever 18 extends vertically downward in the Y-axis direction so as to follow the resin case 11a of the switch with the support shaft 18a on its upper end as the swing support point, and the main lever 18 The tip of the lever is projected in the movement path of the movable contact 5 so as to replace the movable contact, and an intermediate portion of the upper side of the main lever 18 protrudes toward the auxiliary lever 19. The upper edge of the convex part of 18 is formed in the contour shape which engages with the front-end | tip part of the auxiliary lever 19 demonstrated below. Further, 20 is an extremely weak auxiliary spring which serves to return the main lever 18 to the initial position when the movable contact 5 is retracted to the OFF position.

On the other hand, the auxiliary lever 19 changes the position of the main lever 18 and the supporting point, inserts the tip of the lever between the main lever 18 and the actuator 15a of the micro switch 15, and mounts the left and right lever arms. Is a "c" shaped lever supported by the support shaft 19a, and the tip of the lever is a polygon in cross section as shown in FIG. 1, and the upper surface thereof is replaced by the actuator 15a of the micro switch 15. As shown in FIG. .

In this configuration, at the time of closing operation of the circuit breaker, the movable contactor 5 moves to the left side from the OFF position as shown in Fig. 1A to move the main lever 18 of the accessory switch 11 from behind. When pushed, the main lever 18 swings clockwise from the solid line position to the dotted line position with the support shaft 18a as a supporting point, and the convex end of the lever is located behind the front end of the auxiliary lever 19. It collides and pushes the auxiliary lever 19 forward. As a result, the auxiliary lever 19 swings the support shaft 19a clockwise to the support point, and its tip portion pushes the actuator 15a of the micro switch 15 upward. In this case, the return spring force of the contact mechanism of the micro switch 15 acts in the direction of pushing the main lever 18 back through the auxiliary lever 19 in contact with the actuator 15a, but the force vector The direction is directed toward the contact point (acting point) between the main lever 18 and the movable contactor 5, as indicated by the arrow P shown in FIG. 1, and the force vector P of this force remains as it is. It acts as load F1 (repulsive force) with respect to.

On the other hand, when the closing movement of the movable contactor 5 continues, the micro switch 15 has the contact mechanism of the switching operation, and at the same time, the front end portion of the auxiliary lever 19 as shown in FIG. Ascending above the convex portion of the main lever 18 is engaged up and down. In this state, the operating point and the engagement angle between the main lever 18 and the auxiliary lever 19 are changed from the solid line position in FIG. 1A to the position in FIG. 1B, whereby the micro The direction of the vector of return spring force acting from the switch 15 through the auxiliary lever 19 to the main lever 18 is directed almost immediately below, as indicated by the arrow Q shown in FIG. Therefore, in this state, the return spring force of the micro switch 15 stops at the support shaft 18a of the main lever 18 extending vertically downward in the direction substantially the same as the vector Q thereof, and the movable contact 5 is stopped. The load acting in the direction of pushing back decreases sharply to F2.

FIG. 2 is a diagram showing the relationship between the actuator stroke of the micro switch 15 corresponding to the above operation and the movable contactor load F acting as a repulsive force on the movable contactor 5, and the characteristic line shown in FIG. As can be seen from (B), although a large load F1 acts on the movable contact 5 in the stroke region of the first half of the micro switch 15 at the position of the switching operation, the microswitch 15 After the switching operation, the load F2 decreases rapidly. As a result, the repulsive force acting to lower the contact pressure of the main contact from the auxiliary switch 11 in the main contact ON position of the breaker main body is greatly reduced as compared with the conventional structure shown in FIG. The power supply capability of the main contact point can be secured even in the used use state.

Further, when the movable contactor 5 retracts to the OFF position by the OFF operation or the overcurrent tripping operation of the circuit breaker, the main lever 18 returns to the initial position by the spring force of the auxiliary spring 20, and further, the auxiliary lever ( 19 is pushed by the actuator 15a which protrudes downward by the return spring force of the micro switch 15, and returns to an original position.

In addition, although the embodiment shown in FIG. 2 was demonstrated about the auxiliary switch 11, it can implement also about the alarm switch 12 similarly.

EXAMPLE 2

Next, embodiments corresponding to Claims 2 and 3 of the present invention will be described with reference to FIGS. 3A to 3E. In the second embodiment, a case in which the accessory switch 11 and the alarm switch 12 described with reference to FIG. 5 are set as a set and mounted on the left two recesses 3a partitioned in the circuit breaker case 1 will be described. 3, the auxiliary switch 11 is shown in FIGS. 3 (a) and 3 (b), and the independent structure of the alarm switch 12 is shown in FIGS. 3 (c) and 3 (d). (e) shows a state in which the auxiliary switch 11 and the alarm switch 12 are connected to each other.

Here, the auxiliary switch 11 and the alarm switch 12 incorporate the micro switch 15 in the resin cases 11a and 12a, and further, the main lever 18 and the auxiliary lever 19 described in the first embodiment are used. It is composed of the assembled structure, the upper end side of the resin case (11a, 12a) is opposed to the channel-type lead wire through-holes (11b, 12b) and the auxiliary switch 11 and the alarm switch 12 with the slits cut on the upper surface. Opposite ear portions 11c and 12c are formed so as to protrude laterally from the resin case. Further, the protruding dimensions of the opposing ear portions 11c and 12c are set to half the length of the interval between adjacent recesses in accordance with the arrangement pitch of the recesses 3a shown in FIG.

When the auxiliary switch 11 and the alarm switch 12 are set in the circuit breaker main body, the lead wire 13 drawn out from the alarm switch 12 inserted into the inner recess of the breaker case is connected to the outer recess. Inserted into the lead wire through groove 11b formed in the upper end portion of the auxiliary switch 11 to be inserted, the bundle is bundled together with the lead wire 13 of the auxiliary switch 11, and from the upper end of the case of the auxiliary switch 11 to the right side. The protruding opposing ear 11c and the opposing ear 12c protruding to the left from the upper end of the case of the alarm switch 12 are joined together, and both switches are combined in a state connected as shown in Fig. 3E. do. In addition, the lead wire 13 is connected to the terminal of the accessory terminal block 14 shown in FIG.

In this connection state, when the connection assembly of the auxiliary switch 11 and the alarm switch 12 is inserted in the recessed part of the circuit breaker case 1 in position, each switch can be simultaneously mounted in a fixed position by one action. . In addition, the lead wire 13 of each switch does not require unnecessary processing, and can be bundled and drawn out to the side of the breaker case 1.

As described above, according to the configuration of the present invention, the following effects are realized.

(1) According to the configuration of the present invention, when the accessory switch is switched in conjunction with the movable contactor during the closing operation of the circuit breaker, the repulsive force acting on the movable contactor from the accessory switch is drastically reduced. As a result, when the circuit breaker is in the closed state, the contact pressure of the main contact does not decrease due to the influence of the repulsive force from the accessory switch, and the temperature rise of the circuit breaker that has been a problem in the past when the circuit breaker body is provided with the accessory switch. Therefore, it is possible to effectively prevent the impact on the life of main contact and change of breaking performance.

(2) By adopting the configuration of the present invention, the work at the time of attaching a plurality of accessory switches (auxiliary switch and alarm switch) to the circuit breaker as a set can be easily performed, and the serviceability to the user can be improved.

Claims (2)

An accessory switch device of a circuit breaker mounted on the circuit breaker body and detecting an opening / closing operation of the circuit breaker and outputting an electric signal to the outside, the accessory switch being arranged on the left and right sides of the circuit breaker, respectively, In the attached switch device of a circuit breaker which is inserted into a recess for a switch storage and is mounted, leads the lead wires of each accessory switch collectively, and leads them to the side of the breaker case, and is connected to an external signal line. An insertion lead wire through groove is provided in the upper portion of the casing of the attached switch, and the lead wire of the accessory switch mounted on the inner concave portion partitioned in the breaker case is mounted in the outer recess partitioned in the breaker case. The accessory switch device of the circuit breaker characterized in that it is collectively drawn out to the side of the breaker case via the through groove of one accessory switch. The breaker case according to claim 1, wherein an opposing ear portion protruding laterally from an upper end portion of the case of the accessory switch is provided so as to correspond to the arrangement pitch of the recesses partitioned in the circuit breaker case, and a plurality of accessory switches are attached to the circuit breaker body. In the circuit breaker, a lead wire is passed through the upper end of the case between adjacent accessory switches, and each accessory switch is collectively mounted in the recess of the circuit breaker body in a state where the opposing ears are joined together. Accessory switch device.

Images