JPS6252819A - Electromagnetic contactor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electromagnetic contactor, and in particular to an installation structure of spring means for adjusting the matching of its operating characteristics.

In the electromagnetic contactor according to the present invention, the spring means for applying a return force to the armature and the movable insulating base is divided into two spring members, and one spring member has a cantilevered leaf spring portion. By changing the effective length of the leaf spring part by sliding the leaf spring part, the matching of the operating characteristics can be easily adjusted at a minute level. .

Conventional technology Conventionally, as an electromagnetic contactor that opens and closes a fixed contact with a movable contact provided on a movable insulating stand that reciprocates via an armature based on the excitation and demagnetization of the electromagnetic device, for example, a polarized electromagnetic device is used. JP-A-58-209837
The one described in the publication No. 1 is known. In this device, two spring members are installed in order to match the attraction force characteristics of the electromagnet device and the load of the spring system. One spring member is installed between the iron core and the box to adjust the return voltage, and the other spring member is installed between the coupling body and the cover to adjust the operating voltage. It is.

Problems to be Solved by the Invention However, this device has only one spring member for adjusting the return voltage (return force), but it is impossible to adjust the spring force from the outside while it is attached. can be,
Once assembled, adjustments must be made by disassembling the spring member itself or changing the number of spring members, which is extremely complicated.

In addition, when the electromagnet device is of the polar type, a magnetic circuit formed by a permanent magnet is added as an element of the operating characteristics, so the operating characteristics tend to vary more than those of the non-polar type, and a simple adjustment mechanism is required. ing. However, since the polar type is also highly sensitive, it is necessary to adjust the matching between the attraction force characteristics of the electromagnetic device and the applied load at a more minute level, and to do so, it is necessary to adjust the return force at a minute level. . However, like the electromagnetic contactor described in the above-mentioned publication, it is difficult to adjust the minute level with just one spring member because the spring constant inevitably becomes large.

Therefore, in the electromagnetic contactor according to the present invention, the spring means for applying a restoring force to the armature and the movable insulating stand is divided into two spring members, and one spring member The slider features that the spring force is adjustable.

The following is 1 according to the present invention! An embodiment of the magnetic contactor will be described with reference to the accompanying drawings of FIGS. 1 to 4.

In this example, Y° is assumed to be upward in the force direction, and Y
The direction will be explained below.

This embodiment basically includes an armature 1, an electromagnet device 10, a movable insulating stand 20, side cases 30 and 31, and a bottom case 40.
and a terminal protection cover 50.

The armature l is fixed to both ends of the movable iron core 2, with the supporting shaft parts 2a and 2b protruding from holes 3a and 4a. It consists of a movable iron piece 3.4. Positioning notches 3 b and 4 b are provided at both ends of the movable iron pieces 3 and 4 in the longitudinal direction.
is provided.

In addition, the armature l is connected via a sliding spring 9 having a bearing 6.7, an operating spring 8, and a cantilevered leaf spring portion 9a.
It is incorporated into an electromagnet device 10, which will be described later, so that it can move back and forth.

The i-magnet device 10 includes a spool 11 having flanges 11a and Ilb at both ends, a coil 12 wound around the body of the spool 11, and an outer frame yoke 13 surrounding the spool 11. , a permanent magnet 14.14 provided inside this outer frame yoke 13, and an inner plate yoke 15.15.

The spool l has a center hole lie in its body through which the movable iron core 2 can reciprocate, and a pair of arm parts 16, 16 extending from the corners of the collar part 11a,
It has a relay terminal holding part 17 provided so as to connect the ends of the terminals (see FIG. 3). The arm portions 16.16 are provided with guides 1M16a, 1 for guiding the ends 12a, 12b of the coil 12.
6a is provided.

On the other hand, the relay terminal holding portion 17 has recesses 17a, 17a for housing the surge absorbing element 18 in which a diode 18a and a resistor tab are connected in series, and press-fitting grooves 17b, I7b into which the relay terminals 19.19 are press-fitted. is provided. This relay terminal 19.19 is punched out using a press, and has a cutout groove 19a into which the lead wire 18c of the surge absorbing element 18 is press-fitted, and a coil terminal 36, which will be described later, is press-fitted therein for electrical connection. A pair of opposing tongue pieces 19b, 19
It has b.

The outer frame yoke 13 is a bent yoke 13 bent into a substantially U-shape.
a and a plate-like yoke 13b, the bending yoke 13
a and the plate-shaped yoke 13b have bearing holes 13c, 13c in opposing central portions into which the aforementioned bearings 6.7 are fitted and fixed. Furthermore, positioning protrusions 13d, I3d, positioning notches 13e, 13e, and fitting protrusions 1:H, 13f are provided on both sides of the bending/extending yoke 13a to face each other.
On the other hand, continuous minute unevenness portions 13g and fitting holes 13h are provided on both longitudinal edges of the inner surface of the plate-like yoke +3b.

13h is provided. The uneven portion 13g engages with a small protrusion (not shown) provided on the inner surface of the sliding type cooling spring 9 to facilitate fine adjustment of the operating characteristics, which will be described in detail later.

Therefore, in order to assemble the electromagnet device 10 by incorporating the armature l, first, the relay terminals 19.
After press-fitting and fixing, respectively, the surge absorbing element 18 is housed in the recesses 17a, 17a of the relay terminal holding part 17, and its lead wire 18c.

18c is the notch p19a, 19 of the relay terminal 19.19
Press into a and let it stick out.

Next, the coil 12 wound around the body of the spool 11
The ends 12a, 12b of the arm portion 16.16 are inserted into the guide groove 16 of the arm portion 16.
a, pull out along 16a and remove the surge absorbing element 18.
After wrapping it around the wires 18c, 18c, the coil 12, the surge absorbing element 18, and the relay terminal 19 are electrically connected by soldering. Then, the movable iron core 2 is inserted into the center hole lie provided in the body of the spool 11, and the support shafts 2a and 2b located at both ends thereof are inserted into the hole 3a of the movable iron piece 3.4.
4 After fitting and protruding each part a, secure by caulking.

Next, by fitting and fixing the bearing 6 into the bearing hole 13c of the bending yoke 13a, the operating spring 8 is held between the bending yoke 13a and the bearing 6, while the bearing 7 is fitted into the bearing hole 13c of the plate-shaped yoke 13b. If so, fix it. Then, between the arm portions 1G and 1G of the spool 11 (at the maximum facing distance gυ, the side piece of the bending yoke 13a (11J dimension f2til) is
), and after inserting the support shaft portion 2a into the bearing 6, the support shaft portion 2b remaining in the bearing 7 fixed to the plate-like yoke 13b.
At the same time, the protrusions 13f, 1 of the bending yoke 13a
3r is fitted into the holes 13h, 13h of the plate-like yoke 13b and caulked to complete the assembly of the electromagnet device 10.

The movable insulating stand 20 has movable contacts 22a and 22b in four movable contact holders 21 arranged side by side, and a contact piece 22 and a contact coil spring 23 are respectively incorporated therein. It has a holding part 24°25. The holding portions 24 and 25 are slide grooves 24a and 2 that can be slid and press-fitted into both sides of the movable iron piece 3 across the outer frame yoke 13.
5a.

The above-mentioned movable iron piece 3 is provided on the inner surface of the grooves 24a and 25a.
Small protrusions (not shown) are provided for positioning by engaging with notches 3b, 3b provided on both side end surfaces of. This is to ensure accurate and quick attachment to the electromagnet device IO.

Furthermore, the movable insulating table 20 has a protrusion 26 at the center of the lower surface on the Y direction side, and a return conical coil spring 27 is attached to the protrusion 26.
is fixed.

Therefore, in order to attach the movable insulating stand 20 to the assembled electromagnet device IO, the slides 1iIff24 of the holding parts 24 and 25 are attached to the movable iron piece 3 from the lateral direction of the electromagnet device 10.
After positioning a, 25a, cutout portions 3 b, 3
Small protrusions of slide grooves 24a and 25a (not shown) in b
Press until they engage to integrate.

At this time, since there is a risk that the lower end of the conical coil spring 27 in the Y direction may get caught on the support shaft 2a of the movable core 2 protruding from the outer frame yoke 13, move the movable core 2 slightly in the Y direction. It is preferable to press the movable insulating stand 20.

Thereafter, the slide-type cooling springs 9 are slid and press-fitted into both ends of the plate-like yoke 13b in the longitudinal direction, and the assembly of the internal components is completed. In this case, the plate spring portion 9a of the adjustment spring 9 comes into contact with the end of the support shaft portion 2a of the movable iron core 2, and cooperates with the surface conical coil spring 27 to move against the armature l and the movable insulating base 20. gives an upward return force.

The side cases 30 and 31 have the same shape and are symmetrical when their openings overlap each other, and the positioning protrusion 30a and the positioning recess 30b fit together, and the upper end 30c
When the engaging claws 32a and the engaging recesses 32b provided in each are engaged to combine and integrate the rain sound, it becomes a box shape with an opening on the Y direction side, and an upper end on the Y° direction side. Part 30c
A terminal accommodating portion 34 is formed separated by an insulating wall 33 perpendicular to the terminal accommodating portion 34 .

After a fixed terminal 35 with fixed contacts 35a and 35b fixed thereto and a coil terminal 36 are press-fitted into this terminal storage portion 34 along a horizontal groove 33a provided in an insulating wall 33, they can be fixed with screw terminals 37 and 37. It looks like this. It goes without saying that the screw terminals 37, 37 can electrically connect external lead wires (not shown).

Further, the side case 30.31 has a pair of parallel protruding walls 38a, 38h on the inner bottom surface, and the protruding wall 38a.

The distance between the inner surfaces of the permanent magnets 14b is equal to the middle dimension Q of the protrusions 13d provided on the bending yoke 13b, and
It is also equal to the +l+ dimension of No. 14 and the minimum medium dimension Q of No. 4 inner plate yoke 15.15. And the projecting wall 38a.

The distance between the outer surfaces of 38b is the flange-1 provided on the spool 11.
a, equal to the distance between the inner surfaces of Llb, Q8.

Further, a stepped portion 38c (the back side is not shown) for positioning the spool 11 in the zz'' axis direction is provided at the center of the outer surface of the projecting walls 38a, 38b.

On the other hand, on both inner side surfaces of the side cases 30 and 31, there are a pair of protrusions 3 for positioning the outer frame yoke 13 in the x-x' axis direction.
8d and 38d are provided, and the outer frame yoke 13
A guide protrusion 38e is provided to guide the.

Therefore, side case 30. In order to assemble the electromagnet device IO in which the movable insulating table 20 is integrated into the '31, first, the outer frame yoke 13 is positioned by the guide protrusion 38e provided on the side case 30, and then the outer frame yoke 13 is aligned with the protrusion 38d.

38d, the outer frame yoke 13 is pressed in the Z direction, the protrusion 13d of the outer frame yoke 13 is placed between the protruding walls 38a, 38b, and the notch 13e is placed between the protruding walls 38b1. =IN, and the outer frame yoke 13 is positioned in the x-x' axis direction and the Y-Y' axis direction. Then, the spool II is arranged so as to sandwich the projecting walls 38a and 38b between the inner surfaces of the flanges 11a and llb,
While positioning the spool 11 in the Y-Y′ axis direction,
The side end surfaces of the flanges 11a and 11b on the Z direction side are brought into contact with the stepped portion 38c.

At the same time, the coil terminal 36 protruding inward of the side case 30 is press-fitted between the tongue pieces 19b, 19b of the relay terminal 19 press-fitted and fixed into the relay terminal holding part 17 to electrically connect the movable insulating stand 20. The slit part 29 of the side case 3
The movable contact 35a and the fixed contact 22a and the movable contact 35b and the fixed contact 22b are arranged so as to face each other.

Next, a permanent magnet 14 is placed along the inner surface of the outer frame yoke 13.
The lower end of the inner plate yoke 15 is sequentially formed into a protruding wall 38a.

38b, the spool 11 is positioned in the x-x' axis direction. At this time, Y-Y of the inner plate yoke 15
Both end surfaces in the axial direction face the inner surface of the movable iron piece 3.4 so as to be able to abut at a predetermined interval.

Next, when the other side case 31 remaining on the side case 30 is integrated from above through the engaging claw 32a, the engaging recess 32b, the positioning protrusion 30a, and the recess 30b, the spool +1. Outer frame yoke 13. The permanent magnet 14 and the inner plate yoke 15 are positioned in the YY' axis direction.

The bottom case 40 has a planar shape that covers an opening (not shown) formed by combining the side cases 30 and 31, and has a barbed projection 41 on its upper surface that surrounds the opening, and also 30. An engaging claw 42 that engages with an engaging hole 38" provided in the lower part of the bottom case 40 is projected upward.Furthermore, on both longitudinal sides of the lower surface of the bottom case 40 on the Y direction side, rail mounting holes are provided. A groove is provided, and one of the rail locking pieces 46, 46 is connected by a thin wall portion 47 that is approximately U-shaped. Hole 44
is formed.

Therefore, in assembly, the engaging claw 42 is attached to the side case 30.
After positioning along the guide groove 38g of 31, the bottom case 40 may be pressed to engage the engagement claw 42 with the engagement hole 38f.

The terminal protection cover 50 is provided with a positioning groove 53 that fits into the upper end 30c of the side case 30.31 in the center of the lower surface in the Y direction, and a positioning groove 53 that fits into the upper end 30c of the side case 30.31 on both sides of the lower surface in the longitudinal direction. Terminal protection portions 52 separated by slits 51 that can be fitted into the insulating wall 33 provided at .31 are arranged in parallel so as to face each other. And terminal protection cover 5
Side cases 3 are installed on both end surfaces perpendicular to the x-x' axis direction of 0.
Hemispherical small protrusions 54 and 54 are provided which fit into the fitting grooves 38h provided on the inner surface of the 0.31 mm.

Therefore, when assembling, the positioning groove 53 is
and the slit 51 at the upper end 30c of the side case 30.31.
After fitting and positioning the small protrusion 54 to the insulating wall 33 and the insulating wall 33, press from above to fit the small protrusion 54 into the iM38h.
That's fine.

Next, the operation of this embodiment will be explained.

When the coil 12 is not energized, the conical coil spring 27
The movable insulating table 20 is returned to the Y' direction by the spring force of the adjustment spring 9, and the movable contact 22a is separated from the fixed contact 35a, while the movable contact 22b closes the fixed contact 35b.

Then, when the coil 12 is excited and the armature l is moved in the Y direction, the movable insulating base 20 is moved integrally with the armature l in the Y direction via the holding portion 24.25, and the movable contact 22a is moved. While the fixed contact 35a is closed, the movable contact 22b is separated from the fixed contact 35b.

When this excitation is released, the movable insulating table 20 returns to its original state.

Here, the operating characteristics of this embodiment are shown in the graph of FIG. Note that in this graph, the spring load is depicted with the direction of action reversed for easy understanding.

In FIG. 4, A indicates the contact load of three normally closed contacts 35a, and B indicates the contact load of one normally closed contact 35b. C indicates the spring load of the operating spring 8, and D does not indicate the spring load of the conical coil spring 27. Ei! Spring 6 of the adjustment spring 9; single fold; Ea is the maximum value when the effective length of the plate spring portion 9a is shortened, and Eb is the minimum value when the effective length is lengthened. F indicates the total load which is the sum of the above spring loads, Fa is the total load when adjusted to the above Ea, Fb
is the applied load when adjusted to Eb, and the adjustable range is indicated by diagonal lines in FIG.

G indicates the attractive force by the permanent magnet 14.14 when the coil is not excited, and ■■ indicates the attractive force when the rated current is applied to the coil. Furthermore, ■ indicates the impressive ampere turn, that is, the attraction force at the operating voltage, J is the attraction force at the return voltage when the full load is Fa, and K is the attraction force when the full load is Fb.
This shows the attraction force at the return voltage in the case of .

In the present embodiment described above, matching between the attraction force characteristics of the electromagnet device 10 and the applied load basically relies on the spring forces of the conical coil spring 27 and the operating spring 8, but the adjustment spring 9 is Adjustment is possible by changing the effective distance of the plate spring portion 9a that slides and comes into contact with the end surface of the support shaft portion 2b. The return force is applied by the conical spring 27 and the adjustment spring 9, and the operating spring 8 is used to apply the initial operating force. In this embodiment, the adjustment range of the return voltage is 20 to 40% of the rated voltage. For example, when trying to control the return voltage to 20 to 30%, assuming that the attraction force by the permanent magnet 14.14 is constant, the total load at the operating position is only a difference in attraction force of 10% of the rated voltage. You can adjust it even if it varies up and down.

By the way, in the above embodiment, the spring means for applying the return force is divided into two spring members, the conical coil spring 27 and the adjustment spring 9, and the adjustment spring 9 is arranged in the direction indicated by the arrow , the spring force (returning force) can be adjusted by changing the position in the x′ direction and changing the effective length of the leaf spring portion 9a. Therefore, the adjustment of the spring force is the spring 2
7.9 can be easily carried out by incorporating it into the electromagnet device 10, and since the restoring force is shared between the two springs 27.9, the spring constant of the adjustment spring 9 can be small, so that it can be performed at a minute level. can be adjusted.

Further, the conical coil spring 27 and the operating spring 8 are both installed between the electromagnet device 10 and the movable insulating base 20 or the armature l, and are engaged with and held by a housing member such as the side case 30.31. not present. Further, the adjustment spring 9 is slidably attached to the plate-like yoke 13b of the electromagnet device IO. In other words, these spring means are installed independently of the housing part, which is advantageous in terms of positional accuracy and allows measurement and adjustment of the operating characteristics before the housing part is assembled. Furthermore, there is no possibility that the spring force will fluctuate due to deformation of the housing member after adjustment.

Effects of the Invention As is clear from the above explanation, according to the present invention, the spring means for applying a restoring force to the armature and the movable insulating stand is divided into two spring members, and one spring member is provided with a cantilever. A leaf spring part is provided, this spring member is attached to the yoke of the electromagnet device so as to be slidable in the extending direction of the leaf spring part, and the leaf spring part is brought into contact with the armature, so that the sliding position of the spring member is changed. The spring force can be adjusted with a chisel, the return force can be adjusted in the assembled state, and the return force is distributed between the two spring members, requiring a small spring constant, allowing for minute adjustments. Yes, it is ideal for polarized magnetic contactors.

[Brief explanation of drawings]

The drawings show one embodiment of the electromagnetic contactor according to the present invention.
2 is an exploded perspective view, FIG. 2 is a front partial sectional view, FIG. 3 is a front view of the spool, and FIG. 4 is a graph showing operating characteristics. l... Armature, 2... Movable iron core, 9... Adjustment spring, 9a... Leaf spring portion, lO... Electromagnet device, 1
3b...Plate yoke, 20...Movable insulating stand, 22
a, 22b... Movable contact, 27... Conical coil spring, 35a, 35b... Fixed contact. Figure 2 X←→X' Figure 3

Claims (1)

[Claims] (1) In an electromagnetic contactor in which a fixed contact is opened and closed by a movable contact provided on a movable insulating stand that moves back and forth via an armature based on the excitation and demagnetization of an electromagnetic device, a restoring force is applied to the armature and the movable insulating stand. The spring means for imparting is divided into two spring members, one spring member is provided with a cantilevered leaf spring part, and this spring member is slidable in the direction of extension of the leaf spring part on the yoke of the electromagnet device. An electromagnetic contactor characterized in that the plate spring portion is attached to the armature.