JPS6244442Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic contactor, and particularly to an electromagnetic contactor for controlling the opening and closing of electric circuits such as electric motors.

Conventionally, a device shown in FIG. 1 has been used as this type of electromagnetic contactor.

In the figure, a box-shaped mounting plate 10 is provided for mounting the electromagnetic contactor main body on a mounting board, etc., and a plurality of mounting holes 1 are provided in the mounting plate 10.
The electromagnetic contactor main body is screwed onto the mounting board via Oa.

The mounting plate 10 has a base 1 made of an insulating material.
2 is fixed by a mounting screw 14, and the base 12
A terminal plate 16 connected to the main circuit is fixed to the
Further, a fixed contact 20 having a fixed contact 18 is fixed to the terminal plate 16 in a conductive state with the terminal plate 16 . Further, a cross bar 22 made of an insulating material is provided on the base 12 so as to be movable up and down as shown in FIG.
1 is biased upward in FIG. 1 by a tripping spring 26 press-fitted between a spring receiver 24 attached to the lower end of the mounting plate 10 and the mounting plate 10. A movable contact 32 having a movable contact 30 disposed opposite to the fixed contact 18 is inserted into the holding hole 28 provided in the cross bar 22.
2 is biased downward in FIG. 1 by a contact spring 38 that is compressed and mounted between a spring receiver 34 and a spring support 36 provided on the cross bar 22.

Next, the movable contact 30 is driven and the fixed contact 18 is
In order to perform the contact opening/closing action in cooperation with the contact point, a drive mechanism as described below is provided.

That is, a fixed core 40 made of laminated silicon steel plates is disposed on the mounting plate 10, a plurality of pins 42 are inserted through the fixed core 40, and buffer rubber 44 is inserted at both ends of the pins 42. A buffer spring 46 is installed between the buffer rubber 44 and the mounting plate 10. Further, a movable iron core 5 is attached to the lower end of the cross bar 22 by a pin 48.
0 is fixed, and the movable core 50 is disposed opposite to the fixed core 40 with a predetermined gap therebetween.
In order to apply electromagnetic force to the fixed core 40 and attract the movable core, an operating coil 54 is wound around a coil holding frame 52 attached to the fixed core 40, and the operating coil 54 and the coil terminal 56 are connected to each other. It is connected by a lead wire 58.

Furthermore, in order to extinguish the arc that occurs when the contacts open and close, an arc box 60 made of a heat-resistant material is fixed to the base 12 with screws 62. A grid 64 is provided surrounding contact 30 and stationary contact 18 for guiding and extinguishing the arc.

A conventional electromagnetic contactor has the above configuration, and its operation will be explained below.

When a driving voltage is applied to the operating coil 54, an electromagnetic attraction force is generated between the fixed iron core 40 and the movable iron core 50 due to the magnetic flux generated by the operating coil 54.
The movable core 50 is attracted to the fixed core 40 against the external tension spring 26. Along with this, the movable iron core 5
0 moves toward the fixed core 40, and the movable contact 30 of the movable contactor 32 held by the crossbar 22 comes into contact with the fixed contact 18 of the fixed contactor 20. At this time, since the core gap between the movable core 50 and the fixed core 40 is larger than the contact gap between the movable contact 30 and the fixed contact 18, the crossbar 22 is closed when the core is closed. The contact point moves further toward the fixed core 40 than the contact position of the contact point. Therefore, the contact spring 38 is compressed and deformed, and this spring pressure is applied to the spring support 36.
The contact pressure is transmitted to the movable contact 32 via the contact pressure, and a predetermined contact pressure is obtained to close the contacts.

When the drive voltage applied to the operating coil 54 is removed, the electromagnetic attractive force between the fixed core 40 and the movable core 50 disappears, and the crossbar 22 reacts due to the spring biasing force of the tripping spring 26 being compressed. It is moved to the fixed core side and the contacts are separated.

At this time, an arc is generated between the movable contact 30 and the fixed contact 18, but this arc is drawn into the grid 64 surrounding the contact portion and is cooled, separated, and extinguished.

By the way, in the above-mentioned device, it becomes necessary to change the driving voltage supplied to the operating coil 54 or to change the operating coil 54 held in the coil holding frame 52 for maintenance and inspection.

In such a case, first replace the tightening screw 1.
4 to separate the connection between the base 12 and the mounting plate 10, and then remove the lead wire 58 from the coil terminal 56. Furthermore, if this replacement operation is performed after the main circuit wires have been wired to the terminal board 16, it is necessary to also remove these main circuit wires. That is, the above device has a drawback in that the operation for replacing the operating coil 54 is extremely complicated.

The present invention was developed in view of the above-mentioned conventional problems, and its purpose is to easily attach and detach an operating coil assembly that includes a coil holding frame that holds an operating coil and a fixed iron core that is inserted through the coil holding frame. Our goal is to provide electromagnetic contactors that can

In order to achieve the above object, the present invention includes a base that movably guides and holds a movable iron core that is equipped with a main circuit terminal and that moves a movable contact that opens and closes the terminal;
a rail plate that is fixedly disposed in an opening provided at the bottom of the base; and an operating coil assembly that is integrally attached to and removed from the opening provided in the side of the base along the rail plate. , the operating coil assembly includes a fixed core that faces the fixed core and attracts the movable core, an operating coil that is combined with the fixed core to generate a predetermined excitation force, and a coil holding frame that holds the operating coil. , a ratchet that is slidably provided on the coil holding frame and removably engages between the coil holding frame and the rail plate, and either the coil holding frame or the ratchet has an engaging protrusion. The coil holding frame or the ratchet is provided with an engagement groove that engages with the engagement protrusion, the coil holding frame is provided with an engagement portion, and the ratchet is provided with an engagement groove that engages with the engagement protrusion. When the ratchet is inserted along the engagement groove, the elastic engagement part slides on the engagement part and is elastically tilted, and then the elastic engagement part is tilted before the elastic tilting. It is characterized in that it engages with the engaging portion in this state.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows an exploded state of the movable core drive mechanism in the electromagnetic contactor according to the present invention.

In the figure, the bottom of the base 66 has an opening 66.
a, and an opening 66b for attachment/detachment is formed on the side thereof, that is, on the power terminal side of the main circuit. A rail plate 70 for attaching and detaching an operating coil assembly 68, which will be described later, is disposed in the opening 66a, and the rail plate 70 has a pair of parallel sides cut and raised as shown in FIG. Furthermore, a rail portion 70a whose both sides are bent inward, and a stopper piece 70b provided at the end of the rail portion 70a.
is formed. Furthermore, this rail plate 70
has an engagement hole 70c that engages with a mating projection 72a formed on a ratchet 72, which will be described later, and a mounting plate 10.
mounting hole 70d to the base 66 and mounting hole 70 to the base 66.
e and are formed. And the rail plate 70
is attached to the mounting plate 10 together with the base 66 by a tightening screw 72.

On the other hand, the operating coil assembly 68, which is attached to and detached from the rail plate 70, is configured as described below.

That is, two pins 76 are inserted through the fixed core 40, and buffer rubber 78 is provided around each end of the pin 76, and the buffer rubber 78 is fitted into the hole 80a of the guide member 80. There is.
The guide member 80 is provided with a rail hook 80b that engages with the rail portion 70a.
b slides on the rail portion 70a, the operating coil assembly 68 is attached to and detached from the base 66. Furthermore, a buffer spring 82 is held in the engagement groove 40a formed on the lower side of the fixed core 40, which reduces the impact on the bottom surface of the rail plate 70 when the operating coil assembly 68 is attached or detached. It fulfills its function.

On the other hand, a coil holding frame 84 holding the operating coil 54 has an insertion hole 84a through which the fixed iron core 40 is inserted.
The operating coil 54 is fitted into the circumference of the insertion hole 84a and is covered and held by a lid member 86. As shown in FIG. 3, this coil holding frame 84 has a coil holding frame 84
A rail engagement piece 84c with a gap 84b between it and the main body, a ratchet placement part 84e with an integrated engagement protrusion 84d, and a lid part that prevents dust from entering when the operating coil assembly 68 is installed. 84f are provided. In addition, the ratchet arrangement portion 8
4e incorporates a ratchet 72 that removably engages between the coil holding frame 84 and the rail plate 70, and a pair of recesses 72b of the ratchet 72 slides against the engaging protrusion 84d in the direction of arrow AB in FIG. The ratchet 7 is configured to be movably engaged with the ratchet 7.
2 is biased in the direction of arrow B by a return spring 88, which will be described later. An engaging protrusion 72a is formed on this ratchet 72, and when the operating coil assembly 68 is installed, the engaging protrusion 72a engages with the rail plate 7.
By engaging with the engagement hole 70c of No. 0, the operating coil assembly 68 is locked so that it does not come off.

In addition, in order to hold the fixed core 40 so that it does not fall out of the coil holding frame 84 when the operating coil assembly 68 is attached to and removed from the base 66, the coil holding frame 84 has an L-shaped shape as shown in FIG. An engaging piece 90 is provided, and the aforementioned guide member 80
is provided with an engagement hole 92, and by engaging the engagement piece 90 and the engagement hole 92, the operation coil assembly 68 can be attached and detached while the fixed iron core 40 is held in the coil holding frame 84. It can be carried out.

Furthermore, in order to accurately position the operating coil assembly 68 in the insertion direction when mounting it on the base 66, a stopper portion 94 is provided on the side where the engaging piece 90 is attached to the coil holding frame 84, and the operating coil assembly 68 is mounted on the base 66. When the assembly 68 is inserted, the stopper portion 94 is brought into contact with the stopper piece 70b of the rail plate 70, so that the assembly 68 is accurately positioned and mounted.

A characteristic feature of the present invention is that either the coil holding frame or the ratchet is provided with an engaging protrusion, and the other of the coil holding frame or the ratchet is provided with an engaging protrusion that engages with the engaging protrusion. In addition to being provided with a matching groove, the coil holding frame is provided with an engaging portion, and the ratchet is provided with an elastic engaging portion that engages with the engaging portion.

That is, as described above, the coil holding frame 84 is provided with a pair of engaging protrusions 84d, and the ratchet 7
2 has the engaging protrusion 84 as shown in FIG.
An engagement groove 72b that engages with d is provided.

Further, the coil holding frame 84 is provided with an engaging portion 84g as shown in FIG.
has an elastic engagement portion 72 that engages with the engagement portion 84g.
c is provided. The engaging portion 84g is composed of an engaging projection having an inclined surface 84h that slides on the elastic engaging portion 72c and a locking surface 84i that locks the elastic engaging portion 72c. Surface 84
It has an engagement hole 72d that engages with i.

Then, the engagement groove 72b provided on the ratchet 72 and the engagement protrusion 84d provided on the coil holding frame 84 are engaged, and the ratchet 72 is moved against the biasing force of the return spring 88 shown in FIG. By inserting it in the direction of the engagement groove 72b, the elastic engagement portion 7
After the elastic engagement portion 72c slides on the engagement portion 84g and elastically tilts, the elastic engagement portion 72c returns to the state before the elastic tilting and engages with the engagement portion 84g.

The operating coil assembly 68 has the above configuration,
Next, the installation state of the electromagnetic contactor equipped with the operating coil assembly 68 will be explained.

Figure 6 shows the installation state of the electromagnetic contactor, and Figure 7 shows the installation state of the electromagnetic contactor.
The figure shows a side half-section of FIG. 6. 6th
In the installation state shown in the figure, the main circuit power terminal is attached to the left side of the electromagnetic contactor body, the overload protection relay is normally attached to the right side, and the electromagnetic contactor is installed in the direction perpendicular to the page of the figure. Other equipment may be attached to the control board adjacent to the main body. Therefore, by making the direction of attachment and detachment of the operation coil assembly 68 to be the direction of the power supply terminal of the main circuit, it is possible to easily attach and detach the operation coil 54, fixed core 40, etc. even after the electromagnetic contactor main body is attached. .

The embodiment of the present invention has the above configuration, and its operation will be explained below.

First, the assembly operation of the ratchet 72 to the coil holding frame 84 will be explained. The engaging groove 72b provided on the ratchet 72 and the engaging protrusion 84d provided on the coil holding frame 84 are engaged, and the ratchet 72 is returned. The engaging groove 7 resists the biasing force of the spring 88.
By inserting in the direction 2b, the ratchet 72
The elastic engagement portion 72c slides on the inclined surface 84h of the engagement portion 84g provided on the coil holding frame 84, and the elastic engagement portion 72c is elastically tilted. Further, when the ratchet 72 is inserted, the elastic engaging portion 72c returns to the state before the elastic tilting, and due to the pressing force of the return spring 88, the engaging hole 72d of the ratchet 72 and the engaging portion 8
4g engages with the locking surface 84i. Therefore, the ratchet 72 can be securely mounted on the coil holding frame 84, and the ratchet 72 can be prevented from falling off due to the lower part of the ratchet 72 catching on the rail plate 70 or the like after the ratchet 72 is mounted. Can be done.

Next, the fixed core 40 with the buffer spring 82 sandwiched therein
A pin 76 is inserted through the pin 76, a buffer rubber 78 is fixed to both ends of the pin 76, and the buffer rubber 78 is fitted into the hole 80a of the guide member 80. and,
The fixed core 40 is assembled into the insertion hole 84a of the coil holding frame 84 holding the operating coil 54, and the engaging piece 90 provided on the coil holding frame 84 is engaged with the engaging hole 92 provided on the guide member 80. Then, the operating coil assembly 68 is integrated.

On the other hand, a rail plate 70 is fixed to the base 66 with tightening screws 74, and is attached to the mounting plate 10 so that the opening 66b provided on the power terminal side of the main circuit of the base 66 faces upward of the electromagnetic contactor main body. Installed. At this time, the rail plate 70a of the rail plate 70 is fixed so as to protrude into the bottom opening 66a of the base 66.

Then, the operating coil assembly 68 is placed along the attachment/detachment opening 6 of the base 66 so that the gap 84b of the coil holding frame 84 in the operating coil assembly 68 engages with the rail portion 70a of the rail plate 70.
6b in the direction of arrow C in FIG. At this time, as described above, the fixed core 40 is held by the coil holding frame 84 by engagement between the engaging piece 90 provided on the coil holding frame 84 and the engaging hole 92 provided in the guide member 80. Therefore, since the operating coil assembly 68 is inserted into the base 66 as an integrated unit, it can be easily inserted, and there is no possibility that the fixed core 40 may fall out of the coil holding frame 84 during insertion and damage the fixed core 40. It is possible to prevent harm to workers.

Positioning of the operating coil assembly 68 in the insertion direction is performed by the stopper portion 94 of the coil holding frame 84 coming into contact with the stopper piece 70b of the rail plate 70. At this time, the engaging protrusion 7 of the ratchet 72
2a engages with the engagement hole 70c of the rail plate 70, the operating coil assembly 68 is locked with respect to the base 66. Also, at this time, since the rail hook 80b of the guide member 80 is fitted into the rail portion 70a of the rail plate 70, the fixed iron core 40
The movement in the vertical direction in FIG. 6 is restricted, and since the upward biasing force of the buffer spring 82 acts on the fixed iron core 40, the movement is more strongly restricted.

In this way, the operating coil assembly 68 is attached to the rail plate 7.
It can be assembled at a predetermined position on the base 66 by simply inserting it along 0, and can be firmly fixed at the predetermined position.

Next, to remove the operating coil assembly 68 from the base 66, first push up the ratchet 72 in the direction of arrow A in FIG.
2's engagement protrusion 72a and the engagement hole 70 of the rail plate 70
In the state where the engagement with c is released, the operating coil assembly 6
8 in the direction of arrow D.

In addition, in the embodiment described above, the coil holding frame 8
A pair of engagement protrusions 84d are provided on the ratchet 7.
2, an engagement groove 72b that engages with the engagement protrusion 84d.
Although the case in which the coil holding frame 84 is provided with an engaging groove and the ratchet 72 is provided with an engaging projection, the same effect can be obtained.

As explained above, according to the present invention, the operating coil assembly in which the operating coil is incorporated is inserted through the side opening of the base, and is mounted by engaging with the rail portion of the rail plate disposed on the base. Therefore, the operation coil assembly including the operation coil can be replaced by a simple operation of inserting or pulling out along the rail portion.

Further, according to the present invention, either the coil holding frame or the ratchet is provided with an engaging protrusion, and the other of the coil holding frame or the ratchet is provided with an engaging groove that engages with the engaging protrusion. In addition, the coil holding frame is provided with an engaging portion, and the ratchet is provided with an elastic engaging portion that engages with the engaging portion, so that the ratchet can be reliably attached to the coil holding frame. This can prevent the ratchet from falling off due to causes such as the lower part of the ratchet getting caught on a rail plate or the like after the ratchet is installed.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of main parts showing the implementation of a conventional electromagnetic contactor, Fig. 2 is an exploded perspective view showing a preferred embodiment of the electromagnetic contactor according to the present invention, and Fig. 3 is an electromagnetic contactor according to the present invention. External view of the coil holding frame in the device, No. 4
The figure is an external view of the ratchet in the electromagnetic contactor according to the present invention, Fig. 5 is a side view showing the engaging part of the coil holding frame in the electromagnetic contactor according to the present invention, and Fig. 6 is the electromagnetic contactor according to the present invention. FIG. 7 is a side half-sectional view of FIG. 6. Identical members in each figure are designated by the same reference numerals. 16 is a terminal plate, 18 is a fixed contact, 30 is a movable contact, and 40 is a terminal plate.
50 is a fixed core, 50 is a movable core, 54 is an operating coil, 66 is a base, 68 is an operating coil assembly, 7
0 is a rail plate, 70b is a stopper piece, 70c is an engagement hole, 72 is a ratchet, 72b is an engagement groove, 72
c is an elastic engagement part, 72d is an engagement hole, 84 is a coil holding frame, 84d is an engagement protrusion, 84g is an engagement part, 8
4h is an inclined surface, and 84i is a locking surface.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A base that movably guides and holds a movable iron core that moves a movable contact that attaches a main circuit terminal and opens and closes the terminal, and is fixed to an opening provided at the bottom of the base. The operating coil assembly includes a rail plate to be disposed, and an operating coil assembly that is integrally attached to and detached from an opening provided in the side of the base along the rail plate, and the operating coil assembly is configured to be connected to the fixed iron core. a fixed core that faces the movable core and attracts the movable core; an operating coil that is combined with the fixed core to generate a predetermined excitation force; a coil holding frame that holds the operating coil; a ratchet that removably engages between the coil holding frame and the rail plate, an engaging protrusion is provided on either the coil holding frame or the ratchet, and the other of the coil holding frame or the ratchet is provided with an engaging projection. is provided with an engagement groove that engages with the engagement protrusion, the coil holding frame is provided with an engagement portion, and the ratchet is provided with an elastic engagement portion that engages with the engagement portion. , by inserting the ratchet along the engagement groove, the elastic engagement part slides on the engagement part and elastically tilts, and then the elastic engagement part engages with the engagement part in a state before elastic tilting. Features of electromagnetic contactor. (2) In the electromagnetic contactor according to claim 1 of the utility model registration, the engaging portion provided on the coil holding frame locks the elastic engaging portion with an inclined surface that slides on the elastic engaging portion. 1. An electromagnetic contactor comprising an engaging protrusion having a locking surface, wherein the elastic engaging portion provided on the ratchet has an engaging hole that engages with the locking surface of the engaging portion.