CN204303707U - Breaker - Google Patents

Abstract

The utility model provides a kind of breaker, even if the terminal be connected with electric wire of this breaker is adopting with in prior art during same press mode, also can guarantees assembling property, and can guarantee the degree of being adjacent to screw mode peer-level.This terminal is L-shaped, between the electric wire that moving contact or static contact are connected with corresponding breaker, and be fixed by press mode, the bend of this terminal is provided with jut, this jut is extended out by the surface co-planar be connected with said wires, the extended surface of above-mentioned projection and the top of protuberance are arranged with coming close to or in contact with, and the interface that this protuberance is docked by cover portion and said base is outstanding to above-mentioned base side.

Description

breaker

technical field

The utility model relates to a circuit breaker such as a circuit breaker for wiring and a circuit breaker for leakage. Specifically, it relates to a technology for improving terminals used for connecting with external electric wires.

Background technique

For example, in order to prevent electric wires and load devices from being burnt due to excessive current flowing from a transformer (Transfer) to a load device, it is known to arrange a circuit breaker in the middle of the corresponding distribution wires. The circuit breaker has terminals, and the number of poles of the terminals corresponds to a circuit composed of electric wires, that is, single-phase, three-phase, or three-phase four-wire, etc. , and the corresponding wire is "external wire", hereinafter referred to as "wire") connection.

Known methods for connecting circuit breakers and electric wires include, for example, quick-connect terminal methods and plug-in (Plug-in) methods. In the insertion method, the electric wire is formed into a conductor called a bus bar, and the circuit breaker is connected to the conductor. In addition, in the case where a certain degree of ampacity is required, or there is no special requirement for saving construction time, the following method is widely used, that is, the washer (washer) of the screw (screw) provided at the terminal is widely used. ) or the crimping terminal is connected to the electric wire provided with the crimping terminal or the electric wire itself.

However, when a plurality of the above-mentioned circuit breakers are installed in a distribution cabinet, etc., due to the restriction of the installation space on the distribution cabinet, the distribution cabinet itself needs to be miniaturized (downsizing), and the built-in circuit breaker also needs to be Various manufacturers (makers) are making efforts to realize the miniaturization. In addition, in order to accommodate the overcurrent detection device, the switching mechanism (that is, the above-mentioned mechanism for "preventing the electric wire and the load device from being burned"), and the arc extinguishing device (for extinguishing the arc (arc) that occurs when the circuit is disconnected), etc. In order to correspond to the circuit breaker and improve the performance of the circuit breaker at the same time, it is also necessary to pay attention to the components that do not directly affect the performance improvement of the circuit breaker.

Therefore, it is known in the prior art that by changing the method of arranging the above-mentioned terminals on the box as the outer shell of the circuit breaker from the screw method in the prior art to the press-fit method, the arrangement required for the screw method can be saved. Space, when the saved space is used to improve performance or maintain equivalent performance, it is possible to achieve miniaturization of the outer shell (for example, refer to Patent Document 1).

[Patent Document 1] Japanese Invention Patent Publication No. 2000-21284 (lines 28 to 49 of the right column on page 3)

However, since the terminal is the object of attention of the electric circuit construction workers when connecting the electric wires, the degradation of the performance of the terminal, that is, the decrease of the degree of adhesion to the box is not allowed. However, in order to obtain the same degree of adhesion as the above-mentioned screw method, measures such as providing a longer press-fit part have been taken, but simply increasing the pressing force to press it into the box may cause Assembling performance deteriorates, and the case may be damaged due to the press-fitting action.

Utility model content

In view of the above circumstances, an object of the present invention is to provide a circuit breaker, which can ensure assembly performance even when the terminals connected to electric wires are used in the same press-fit method as in the prior art. At the same time, it has the same level of adhesion as the screw method.

The circuit breaker involved in the utility model has a box body, an opening and closing mechanism part, a crossbar (crossbar, a moving contact support arm), a moving contact, a static contact, an arc extinguishing device and a connection terminal. Among them, the box body is composed of a cover (cover) and a base (base) formed by an insulator; the opening and closing mechanism part is arranged between the frame plates (frame plates) arranged oppositely, and has an operating handle ( handle); the cross arm is linked with the opening and closing mechanism to rotate; the moving contact is linked with the cross arm, and at least one end has a moving contact; the static contact has a static contact, which can be connected to the moving contact Contact and separation, the contact and separation of the two can be switched; the arc extinguishing device is used to cut off the arc generated between the static contact and the movable contact; the terminal is L-shaped, located between the static contact and the Between the wires connected to the corresponding circuit breaker, or between the moving contact and the wires connected to the corresponding circuit breaker, is fixed by being pressed into the base. A protruding portion is provided on the bent portion of the L-shaped terminal, and the protruding portion has an extending surface coplanarly extended from the surface connected to the electric wire, and the extending surface of the protruding portion is close to or in contact with the top end of the protruding portion, The protruding portion protrudes from the base side of the butt joint surface where the cover portion and the base are butted.

In the present invention, the surface formed by bending from the surface connected to the electric wire of the connection terminal may be coplanar with the top end of the protrusion.

In addition, the protruding portion may be integrally formed with the cover portion.

As described above, according to the present invention, it is possible to provide a circuit breaker with stable quality, which not only has excellent assembly performance and low cost, but also can be used when the circuit construction worker connects the electric wires to the terminals of the corresponding circuit breaker. , the terminal will not move.

Description of drawings

FIG. 1 is an external perspective view of a circuit breaker according to Embodiment 1 of the present invention.

Fig. 2 is a perspective view of the circuit breaker in Fig. 1 before the cover is installed.

Fig. 3 is a sectional view taken along line A-A in Fig. 1 .

Fig. 4 is an enlarged view of the connection terminal in Fig. 1 .

FIG. 5 is a perspective view corresponding to FIG. 2 in a modified example.

[Description of Reference Signs]

1: Cover; 1b: Protrusion; 2: Base; 3: Operating handle; 4: Power terminal; 5: Load terminal; 5b: First surface; 5c: Second surface; 5f: Protrusion ;6: Static contact; 7: Static contact; 8: Moving contact; 10: Cross arm; 11: Moving contact; 51: Switching mechanism; 52: Arc extinguishing device;

Detailed ways

【Embodiment 1】

FIGS. 1 and 2 are external views of the circuit breaker according to Embodiment 1 of the present invention in a tripped state. Specifically, FIG. 1 is the state after installation, and FIG. 2 is the state before the cover is installed. . In addition, FIG. 3 is a sectional view taken along line A-A in FIG. 1, and FIG. 4 is an outline view of a wiring conductor as an important part.

In FIGS. 1 to 3, the insulating box of the 3-pole circuit breaker 101 is composed of a cover part 1 and a base 2, wherein a switching mechanism part 51, an arc extinguishing device 52 and an overcurrent protection device are arranged on the base 2. 53, wherein the opening and closing mechanism part 51 has an operating handle 3, and the number of arc extinguishing devices 52 (here, 3) corresponds to the number of poles of the terminals. The operating handle 3 protrudes outward from the handle window 1a of the cover 1 so that it can be operated in the ON or OFF direction, which is a known prior art. In addition, due to the positional relationship between the arc extinguishing device 52 and the overcurrent protection device 53, the connecting terminal 4 is a power-side connecting terminal connected to the power-side electric wire (not shown), and the connecting terminal 5 is connected to the load-side electric wire (not shown). ) connected load side terminals, which is also known. In addition, when connecting to each electric wire, use a screw with a washer or the like at the screw holes 4a, 5a of each connecting terminal 4, 5 to securely connect the electric wire or crimp terminal crimped on the top end (tip) of the electric wire.

In addition, the switching mechanism part 51, the arc extinguishing device 52, and the overcurrent protection device 53 also employ|adopt well-known technology. That is, the circuit breaker 101 is provided with a static contact 7 and a moving contact 11, wherein the static contact 7 is formed by extending from the power supply side terminal 4, and has a static contact 6 at one end thereof, and the moving contact 11 constitutes a switch. One part of the closing mechanism part 51 is held by the cross arm 10 which is, for example, a resin molded part, and is connected to the load side terminal 5 through the movable contact support 8 and the overcurrent protection device 53, and has a movable contact at one end thereof 9. The contact and separation of the static contact 7 and the movable contact 11 can be switched. In particular, when the two are separated, an arc will be generated between the static contact and the movable contact, and the arc will be cut off by the arc extinguishing device 52 . In addition, the separation of the two is carried out in the following manner, that is, the two are separated by the operation of the operating handle 3 in the OFF direction, or the overcurrent protection device 53 operates according to the current overload state of the circuit, and the opening and closing mechanism part Make corresponding actions to separate the two. Furthermore, since the circuit breaker 101 according to Embodiment 1 is an earth leakage circuit breaker having a known zero-phase current transformer 12 and an earth leakage protection device 54, the above separation is also performed when the leakage current of the circuit is equal to or greater than a predetermined value. action. These known devices are not an important part of the present invention, so detailed description thereof is omitted.

Next, each connecting terminal which is an important part of the present invention, especially the load-side connecting terminal 5 (hereinafter simply referred to as terminal 5 ) will be described. As shown in FIG. 4 , the shape of the terminal 5 is roughly in the shape of a letter L, and the electric wire or the crimping terminal crimped on the top of the electric wire is closely attached to the first surface 5b, and the first surface 5b is the bottom surface of the L-shape. The illustrated screws are firmly fitted in the screw holes 5 a to electrically connect the electric wires to the terminals 5 . In addition, the longer second surface 5c and the shorter third surface 5d that stand upright with respect to the first surface 5b each have a pair of bulging portions 5e that bulge out of these surfaces. By inserting the terminal 5 into the base 2, The insertion groove 2a (refer to Fig. 3) that is set, realizes so-called press-fit installation. In addition, the second surface 5c is also the welding surface of the terminal 5 and the conductor 13 passing through the zero-phase converter 12, or the welding of the terminal 5 and the conductor (not shown) between the second surface 5c and the static contact 7 noodle.

A protruding portion 5f is provided on the bent portion between the first surface 5b and the second surface 5c of the L-shaped terminal 5, and the protruding portion 5f extends from the first surface 5b and is coplanar with the first surface 5b, namely It constitutes the same plane as the first surface 5b. In addition, as shown in FIG. 2 , the cover 1 is provided with a protruding portion 1 b that protrudes toward the base 2 from the mating surface of the cover 1 that abuts the base 2 . The positional relationship between the two, that is, the protruding portion 5f and the protruding portion 1b is shown in FIG. 3 , and the protruding portion 1b is located above the protruding portion 5f on the paper and is provided close to the protruding portion 5f. Therefore, it is not only possible to ensure enough space for connecting electric wires or crimping terminals crimped on top of the electric wires, that is, sufficient space on the first surface 5b can be ensured, but also when the circuit construction workers fasten the electric wires and the terminals 5 After connection, the terminal 5 can be prevented from moving upward (or being deformed) when, for example, a screwdriver inserted into the tip of the screw is pulled out, or when a load is applied to the electric wire for some reason. Therefore, as for the insertion of the terminal 5 into the insertion groove 2a, it is possible to determine its press-fitting condition from the viewpoint of assemblability, which helps ensure stable quality and greatly reduces assembly costs. Here, "near" means that when the cover part 1 and the base 2 are fitted, the distance between the protruding part 1b and the protruding part 5f which are arranged opposite to each other is a relatively short distance, but this distance does not make the two mutually close. Interference prevents the cover 1 from fitting with the base 2 . That is, there is a relatively short distance between the protruding portion 1b and the protruding portion 5f that are disposed opposite to each other. This distance is set based on the consideration that the protruding portion 1b has a dimensional tolerance. Of course, the protruding portion 1b and the protruding portion 5f may be in contact as long as the fitting of the cover portion 1 and the base 2 is not hindered.

In addition, as shown in FIG. 3 or FIG. 4, the top end of the protrusion 5f is coplanar with the second surface 5c, that is, the protrusion 5f does not protrude from the second surface 5c, so the zero-phase change flow shown in FIG. 2 can be more ensured. The insertion space of the leakage detection circuit 12a that the device 12 has is a better way. In addition, in this embodiment, the protruding part 1b is integrally formed with the cover part 1, however, as shown in FIG. In particular, it is more effective to use it in combination with the power supply side terminal 4 when taking countermeasures against the gas discharge generated when the arc extinguishing device 52 cuts off the arc. When the protruding portion is provided as a separate member like the spacer 14 , the protruding portion 1b comes into contact with the protruding portion 5f due to its own weight when the circuit breaker is arranged with the base 2 positioned below. In addition, when the circuit breaker is arranged, when the self-weight of the protruding part 1b does not face the protruding part 5f side, the protruding part 1b does not need to be in contact with the protruding part 5f. That is, similarly to the case where the protrusion 1b is formed on the cover 1, the protrusion 1b (spacer 14) and the protrusion 5f may be provided close to each other.

Claims (3)

1. A circuit breaker, having: a box body consisting of a cover portion formed of an insulator and a base; an opening and closing mechanism part, which is arranged between the oppositely arranged frame plates, and has an operating handle protruding from the cover part; a cross arm, which rotates in conjunction with the opening and closing mechanism; A movable contact, which is linked with the cross arm, and has a movable contact at least one end; A static contact, which has a static contact, the static contact can be contacted and separated from the movable contact, and the contact and separation of the two can be switched; an arc extinguishing device for cutting off an arc generated between said stationary contact and said movable contact; The connection terminal, which is L-shaped, is located between the static contact and the wire connected to the circuit breaker, or between the moving contact and the wire connected to the circuit breaker, and is pressed into the base to be fixed, It is characterized in that, A protruding portion is provided on the bent portion of the L-shaped terminal, and the protruding portion has an extending surface coplanarly extended from the surface connected to the electric wire, and the extending surface of the protruding portion is aligned with the protruding portion. The top end approaches or touches, and the protruding part protrudes from the side of the base where the cover part and the base abut against each other. 2. The circuit breaker of claim 1, wherein: A surface of the connection terminal bent from the surface connected to the electric wire is coplanar with the top end of the protrusion. 3. The circuit breaker according to claim 1 or 2, characterized in that, The protruding portion is integrally formed with the cover portion.