JPH0221529A - Overcurrent protector - Google Patents

Abstract

PURPOSE:To realize the mass production adaptability and a low cost of products by installing beforehand only a common trip mechanism with no relation to the responding current value to the main body base of an overcurrent protector, and installing an overcurrent detector of the responding current value voluntarily when necessary. CONSTITUTION:A trip mechanism 35 and an overcurrent detector 5 are separated and made to mount and dismount freely to the main body base of an overcurrent protector. At the same time, a part of a fixed magnetic iron piece 36 which composes a magnetic circuit of the overcurrent detector 5 is divided to belong to the trip mechanism 35. And, to the demand of variation of the responding current value of the overcurrent detector 5 following the variation of the load to protect, the connection of the coil of the overcurrent detector 5 and a load terminal 4, and the connection of the coil 7 and a movable contact maker rod 11 are cut off, and the lower part 41 of a reverse L-shape fixed iron piece 37 is separated from the lower part 40 of a fixed magnetic iron piece 36. After the overcurrent detector 5 is dismounted from a cover main body 1, an overcurrent detector 5 to satisfy the demand is installed to the case main body 1, and the coil 7 is connected to the load side terminal 4 and to the variable contact maker rod 11 in the reverse order to the dismounting. In such a way, the overcurrent detector 5 can be replaced easily without losing the quality and the function of the product. The mass productivity of products is improved and the cost is reduced consequently.

Description

[Detailed Description of the Invention] The present invention is an overcurrent system that opens and closes AC or DC low-voltage electrical circuits or low-voltage equipment, and protects wiring and equipment by automatically shutting off in the event of an overload or short circuit. Regarding protectors.

Conventional O technology A conventional overcurrent protector will be explained with reference to FIG.

In the figure, 1 is a main body base, 2 is a power supply side terminal provided with a fixed contact 3, and 4 is a load side terminal. 5 is a fixed magnetic pole 6. Coil 7, plunger part 8. One end of the coil 7 is connected to the load side terminal 4, and the other end is connected to the tail end of the movable contact rod 11, which is an overcurrent detection section equipped with a fixed magnetic frame 9. A movable contact 10 is provided at the tip, and the middle portion is loosely fitted onto a fixed shaft 32 provided on a main frame 23, which will be described later, and is biased clockwise by a cutoff spring 33. Also 12
2 is an operating handle that is biased clockwise by a spring 14 around a fixed shaft 13 set on the main body base 1; 15 is connected to the operating handle 12 by a shaft 16 provided below the operating handle 12; A lower link 17 is connected to the movable contact rod 11 by a shaft 18 and a shaft 19 as a side link.
A trip shaft 20 is integrally supported by the trip shaft 21 and biased counterclockwise by a spring 22, and an engaging portion is provided below the upper link 15 by cutting out a portion. 30 is engaged with a semicircular retaining portion 31 which is provided by cutting out a semicircular portion of the tri-tub shaft 21. Reference numeral 23 is a main frame formed by punching and bending a magnetic metal plate and fixed to the main body base 1 by fixing means (not shown) to form the fixed magnetic frame 9 of the overcurrent detection section 5 and the movable contact indicator 11. The six movable iron pieces 25 are equipped with a shaft 32 for bearing them and a shaft 24 for bearing a movable iron piece 25 (to be described later), and are approximately L-shaped in shape, and are biased counterclockwise around the shaft 24 by a spring 26, while the tip 27 is Fixed magnetic pole 6 of the overcurrent detection section 5
The other tip 28 faces the tip 29 of the trip piece 20.
is facing.

In the illustrated closed state, the engaging portion 30 provided on the upper link 15 is engaged with the semicircular engaging portion 31 of the trip piece 20, so that the upper link 15 and the lower link 1-7 are configured. The trouble link mechanism does not bend like Rk and maintains a closed circuit state. When an overcurrent flows through the coil 7 of the overcurrent detection unit 5, the other end 28 of the movable iron piece 25 is activated by the trip piece 2.
By pressing and rotating the tips 29 of 0, the engaging parts 30 and 31 are separated from each other, the trouble mechanism is bent by the cutoff spring 33, and one of the connecting shafts is displaced and movable in the direction of arrow A in the figure. The contact rod 11 acts in the direction of opening the circuit, rotates the movable contact rod 11, and interrupts the circuit.

In the conventional overcurrent protector, if you want to change the response current value of the overcurrent detection section 5 due to changes in the protected load equipment, only the overcurrent detection section 5 needs to be replaced. is almost economically impossible. That is, the fixed magnetic frame 9 constituting the overcurrent detection section 5
The main frame 23 that supports the movable iron piece 25 and the movable contact rod 11 is formed of an integrated magnetic metal plate, and in order to take out the overcurrent detection section 5 from the main body base 1, the main frame 23. Movable iron piece 25. Movable contact lever 11 and upper link 15. Lower link 17. Fixed contact 3. Power side terminal 2. Operation handle 1
After all parts except 2 are taken out at once, the overcurrent detection part 5 must be separated and replaced, and assembled in the reverse order to meet the request for changing the response current value, which is economically acceptable. In reality, we keep several types of overcurrent protectors with different response current values of the overcurrent detection unit 5 in stock, and when requested, we replace the overcurrent protector itself.
Therefore, it is necessary to manufacture and stock several types of overcurrent protectors, which poses the problem of being uneconomical from a distribution and management perspective.

.゛ The present invention was proposed to solve the above-mentioned problems, and the trip mechanism including the movable iron piece, the link F ellipse, and the operating handle is separated from the overcurrent detection section to form an overcurrent protector. In addition to being removably attachable to the main body base, a part of the fixed magnetic iron piece constituting the magnetic circuit of the overcurrent detection section is divided to belong to the trip mechanism section, and both of the divided fixed magnetic iron pieces are pressed together during installation. A part of the circumference of the hole 58 into which the operating handle shaft 13 is fitted and the connecting shaft 4 of the trip mechanism are designed to minimize magnetic resistance as much as possible.
A raised bank 63 around the elongated hole 62 on which the slider 5 slides.
．． By providing 64, the relative position of the trip mechanism with respect to the main body base is maintained appropriately.

Embodiment FIG. 1 shows the cover of the overcurrent protector of the present invention and the cover of the trip mechanism section 35 provided in the overcurrent protector of the present invention removed to expose the inside, and FIG. 2 shows the overcurrent protector of the present invention This figure shows only the cover of the current protector removed, and for convenience, parts corresponding to those shown in FIG. 3 are designated by the same reference numerals. In FIG. 1, reference numeral 34 indicates the main frame of the tour/lput section 35 molded using the insulating base material 1, such as phenol or polyester, and the operating handle 12 is fitted into the main frame 34. The movable iron piece 25 is supported on a shaft 24 that is not mounted on the main frame 34 and is biased counterclockwise by a spring 26. ．．
The fixed magnetic iron piece forms a magnetic circuit together with the inverted fixed iron piece 37, and a pair of protrusions 38.38 are provided on the front side and the back side in the figure in the middle of the fixed magnetic iron piece 36.
The fixed magnetic iron piece 36 is fixed to the main frame 34 by fitting the fixed magnetic iron piece 36 into the square hole 39 provided in each of the main frame 34 and a wall 57 to be described later. Is the connected upper link 43 due to overcurrent?
? , f'N When the circuit is closed, the shaft 4/ which presses the movable contact rod 11
1 and a shaft 45 provided above it.
and a shaft 46 provided below the upper (m link 42) are connected by a lower link 47, and a roller 48 is further fitted on the shaft 46. 49 is installed in the main frame 34. A torso piece is opened clockwise around the shaft 50 by a spring (not shown), and two protrusions 51 and 52 extending outward from its circumference are swung, and one of the protrusions is Part 51
is in contact with a stopper part 53 formed by cutting and bending a part of the fixed magnetic iron piece 36 to restrict clockwise rotation of the trip piece 49, and the other protrusion 52 is in contact with the other tip 28 of the movable iron piece 25. ing.

In addition, a lower tip 56 of a hanging interlocking piece 55, which is rotatable about a shaft 54 set in the main frame 34, is pressed into a semicircular engagement portion 31, which is provided by cutting out the semicircular portions of the four trip pieces. When the overcurrent protector is closed,
The clockwise biasing force of the movable contact rod 11 by the barrier spring 33 brings the roller 48, which is biased flN in the direction of arrow B, into pressure contact.

When an overcurrent flows through the overcurrent detection unit 5, the tip 27 of the movable iron piece 25 is attracted to the fixed magnetic pole 6, and the other tip 28 presses and rotates the projections 52 of the four trip pieces, causing the hanging interlocking piece 5 to rotate.
5 is disengaged from the semicircular engagement portions 31 of the four trip pieces, and the upper link 42.
The trouble mechanism composed of the lower link 47 is bent, and the movable contact rod 11 is rotated in a known technical manner.
Break the circuit. In order to make it possible to attach the cover 57 to the main frame 34 of the trip mechanism section 35, as shown in FIG. Movable iron shaft 24
．． Fitting holes 58, 59, respectively corresponding to the trip base shaft 50,
When the cover 57 is provided with a long hole through which the connecting shaft 45 can slide up and down and a square hole 39 corresponding to the protrusion 38 of the fixed magnetic iron piece 36 as described above, and the cover 57 is fitted onto the main frame 34. The structure is such that the trip'[fl'I35 functions without any trouble. Further, when the trip mechanism section 35 is attached to the main body base 1 of the overcurrent protector, the other tip 28 of the movable iron piece 25 is brought into proper contact with the projections 52 of the four trip pieces, and the inverted fixed magnetic iron piece 37 The lower part 40 of the fixed magnetic iron piece 36 is brought into sufficient pressure contact with the lower part 41 of the main body base 1 to minimize the magnetic circuit resistance.
In order to make the relative position of the M section 35 appropriate, one step is provided around a part of the circumference of the hole 58 of the main frame 34 and the cover 57 into which the operating handle shaft 13 is fitted, and the entire circumference of the elongated hole 62 in which the connecting shaft 45 slides. Elevated bank portions 63 and 64 are respectively provided, and the bank portions 63 and 64 are provided in recesses corresponding to the bank portions 63 and 64 provided on the main body base 1 and the cover of an overcurrent protector (not shown).
so that it fits. Therefore, in response to a request to change the response current value of the overcurrent detection unit 5 due to a change in the protected load,
The connection between the coil 7 of the overcurrent detection unit 5 and the load terminal 4 and the connection between the coil 7 and the movable contact rod 11 are disconnected, and the lower part 41 of the inverted fixed iron piece 37 is removed from the lower part of the fixed magnetic iron piece 36. After removing the overcurrent detection unit 5 from the cover body 1, attach the overcurrent detection unit 5 that satisfies the requirements to the cover body 1, and connect the coil 7 to the load side terminal in the reverse order of attachment and detachment. 4 and the movable contact lever 11, it is possible to easily replace the overcurrent detector 5 without losing the proper quality function of the overcurrent protector.

The above describes the replacement of the overcurrent detection unit 5 based on a request to change the responsive current value, but if there is a request to use it as a voltage responsive exception protector instead of an overcurrent protector, it is possible to replace the overcurrent detector 5 based on a request to change the responsive current value. It is also possible to remove the existing overcurrent detector and replace it with a magnet that responds to voltage.

Invention Ω Effect Not only can the overcurrent detection section be easily replaced when the protected load changes, but only the common tripping mechanism that is unrelated to the response current value is pre-assembled into the main body base of the overcurrent protector. By incorporating an overcurrent detection section with an arbitrary response current value as needed, there is no need to produce and keep several types of overcurrent protectors with different response current values, and the product can be mass-produced and the price can be reduced. can be easily achieved.

[Brief explanation of the drawing]

1st. FIG. 2 shows one embodiment of the present invention, and FIG. 3 shows a conventional overcurrent protector. In the figure, 5 is an overcurrent detection section, 14 is a handle shaft, and 34
45 is a main frame, 45 is a connecting shaft, 36 is a fixed magnetic iron piece, 41 is an inverted fixed magnetic iron piece, and 63 and 64 are bank parts. Applicant Nikko Electric Manufacturing Co., Ltd. Figure 2

Claims (2)

[Claims] (1) The trip mechanism including the movable iron piece, link mechanism, and operation handle and the overcurrent detection section are separated and can be attached to and removed from the overcurrent protector main body base, and the magnetic circuit of the overcurrent detection section is configured. An overcurrent protector characterized in that a part of the fixed magnetic iron piece is divided and attached to the trip mechanism part, and when mounting, both of the divided fixed magnetic iron pieces are pressed together to reduce magnetic resistance as much as possible. . (2) By providing raised banks 63 and 64 around a part of the circumference of the hole 58 into which the operating handle shaft 14 is fitted and around the elongated hole 62 in which the connection shaft 45 of the trip mechanism slides, the trip An overcurrent protector characterized by properly maintaining the relative position of a mechanical part to a main body base.