JPH0746554B2 - Electromagnetic contactor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor, and more particularly to an installation structure of spring means for adjusting matching of its operating characteristics.

SUMMARY OF THE INVENTION In an electromagnetic contactor according to the present invention, spring means for applying a restoring force to an armature and a movable insulating base is divided into two spring members, and one spring member is springed in the axial direction of the movable iron core. A plate-shaped cantilever spring that exerts a force and a slide-type adjustment spring that can adjust the arm length, and the spring force can be adjusted by sliding it, making it easier to adjust the matching of operating characteristics. Moreover, it can be performed at a minute level.

2. Description of the Related Art Conventionally, as an electromagnetic contactor that opens and closes a fixed contact by a movable contact provided on a movable insulating base that reciprocates via an armature based on excitation and demagnetization of an electromagnet device, for example, a polarized electromagnet device is used. The one described in JP-A-58-209837 is known as a device having In this device, two spring members are provided in order to match the attraction force characteristic of the electromagnet device and the load load of the spring system. One spring member is installed between the iron core and the box for adjusting the return voltage, and the other spring member is installed between the connecting body and the cover for adjusting the operating voltage. Is.

However, this one has only one spring member for adjusting the return voltage (return force), and it is impossible to adjust the spring force from the outside in the attached state. Yes,
It is extremely complicated because it is necessary to disassemble the assembled product once and replace the spring member itself, or to change the number of spring members for adjustment.

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 greatly than those of the nonpolar type, and a simple adjustment mechanism is required. ing. Moreover, since the polarized type is also highly sensitive, it is necessary to adjust the matching between the attractive force characteristic of the electromagnet device and the load load at a finer level, and for that purpose, the restoring force needs to be adjusted at a finer level. However, like the electromagnetic contactor described in the above publication, it is difficult to adjust the minute level with only one spring member because the spring constant is inevitably 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 base is divided into two spring members, and one spring member is It is characterized in that it is a plate-shaped cantilever spring in which a spring force acts in the axial direction of the movable iron core, and is a slide type adjustment spring capable of adjusting the arm length.

Embodiment An embodiment of the electromagnetic contactor according to the present invention will be described below with reference to the accompanying drawings of FIGS. 1 to 4.

In the present embodiment, the Y ′ direction will be referred to as the upper side and the Y direction will be referred to as the lower side.

In the present embodiment, the armature 1, the electromagnet device 10, the movable insulating base 20, the side cases 30 and 31, the bottom case 40, and the terminal protection cover 50 are generally included.

The armature 1 has a stepped movable iron core 2 having support shafts 2a and 2b at both ends, and a movable iron core 2 which is fixed to both ends of the movable iron core 2 by projecting the support shafts 2a and 2b from the holes 3a and 4a. It consists of iron pieces 3 and 4. Positioning notches 3b and 4b are provided at both ends of the movable iron pieces 3 and 4 in the longitudinal direction.

The armature 1 is incorporated in a later-described electromagnet device 10 via a slide type adjustment spring 9 having bearings 6 and 7, an operation spring 8 and a cantilevered plate spring portion 9a so as to be able to reciprocate.

The electromagnet device 10 includes a spool 1 having collars 11a and 11b at both ends.
1, and a coil 12 wound around the body of this spool 11,
The spool 11 includes a substantially U-shaped outer frame yoke 13 and permanent magnets 14 and 14 and inner plate yokes 15 and 15 provided inside the outer frame yoke 13.

The spool 11 has a center hole 11c in the body of which the movable iron core 2 can reciprocate, while a pair of arm portions 16 and 16 extending from the corners of the collar portion 11a and end portions of the arm portions 16 and 16 are formed. It has a relay terminal holding portion 17 provided so as to connect (see FIG. 3).
The arm portions 16, 16 are provided with guide grooves 16a, 16a for guiding the end portions 12a, 12b of the coil 12. On the other hand, the relay terminal holder 1
In 7 are recesses 17a, 17a for accommodating a surge absorbing element 18 in which a diode 18a and a resistor 18b are connected in series, a relay terminal 19,
Press-fitting grooves 17b, 17b into which 19 is press-fitted are provided. The relay terminals 19 and 19 are punched out by a press, and the cutout groove 19a into which the lead wire 18c of the surge absorbing element 18 is press-fitted and the coil terminal 36 to be described later are press-fitted into a pair for electrical connection. Tongue pieces 19b, 19b facing each other.

The outer frame yoke 13 is composed of a bending yoke 13a and a plate-shaped yoke 13b that are bent in a substantially U-shape, and the bending yoke 13a and the plate-shaped yoke 13b are fitted with the bearings 6 and 7 at the center portions facing each other.
It has bearing holes 13c, 13c for fixing. Furthermore, bending yoke 1
Positioning protrusions 13d and 13
d, positioning notches 13e, 13e and fitting protrusions 13f, 13
While the f is provided, a continuous minute uneven portion 13g and a fitting hole 13 are provided on both edges of the plate-shaped yoke 13b in the longitudinal direction of the inner surface.
h and 13h are provided. The uneven portion 13g engages with a small protrusion (not shown) provided on the inner side surface of the slide type adjustment spring 9 to facilitate fine adjustment of operation characteristics which will be described in detail later.

Therefore, in order to assemble the electromagnet apparatus 10 by incorporating the armature 1, first, the relay terminals 19 and 19 are press-fitted and fixed in the press-fit grooves 17b and 17b provided in the relay terminal holding portion 17 of the spool 11, respectively, The surge absorbing element 18 is housed in the recesses 17a, 17a of the holding portion 17, and the lead wires 18c, 18c thereof are press-fitted into the cutout grooves 19a, 19a of the relay terminals 19, 19 so as to be projected.

Next, the end portions 12a, 12b of the coil 12 wound around the body of the spool 11 are pulled out along the guide grooves 16a, 16a of the arm portions 16, 16, and the lead wires 18c, 18c of the surge absorbing element 18 are drawn. Then, the coil 12, the surge absorbing element 18, and the relay terminal 19 are electrically connected by soldering. Then, the movable iron core 2 of the center hole 11c provided in the body portion of the spool 11 is inserted, and the support shaft portions 2a and 2b located at both ends thereof are fitted into the holes 3a and 4a of the movable iron pieces 3 and 4, respectively. After projecting, crimp and fix.

Then, by fitting and fixing the bearing 6 in the bearing hole 13c of the bending yoke 13a, the operating spring 8 is sandwiched between the bending yoke 13a and the bearing 6, while the bearing 7 is fitted in the bearing hole 13c of the plate-shaped yoke 13b. Fixed. And the arm parts 16 and 16 of the spool 11
Bending yoke 13a from diagonally above during the interval (maximum facing distance l ₁ )
After inserting the end portion of the side piece (width dimension l ₂ <l ₁ ) and inserting the support shaft portion 2a into the bearing 6, the bearing 7 fixed to the plate-shaped yoke 13b
The supporting shaft portion 2b remaining therein is inserted, and the projections 13f and 13f of the bending yoke 13a are fitted into the holes 13h and 13h of the plate-shaped yoke 13b and caulked, whereby the assembly of the electromagnet device 10 is completed.

The movable insulating base 20 has four movable contact holders 21 arranged in parallel with a contact piece 22 having movable contacts 22a and 22b and a contact coil spring 23, respectively, and a holding portion 24 protruding downward from both side portions. , 25. The holding portions 24 and 25 have slide grooves 24a and 25a which can be slid and pressed into both sides of the movable iron piece 3 while straddling the outer frame yoke 13. Small projections (not shown) are provided on the inner side surfaces of the groove portions 24a, 25a to engage with the cutout portions 3b, 3b provided on both end surfaces of the movable iron piece 3 for positioning. This is because the attachment to the electromagnet device 10 can be performed accurately and quickly.

Further, the movable insulating base 20 has a protrusion 26 at the center of the lower surface on the Y direction side.
A return conical coil spring 27 is fixed to the protrusion 26.

Therefore, the movable insulating base 20 is attached to the assembled electromagnet device 10 described above.
To install the slide grooves 24a, 25a of the holding portions 24, 25 on the movable iron piece 3 from the lateral direction of the electromagnet device 10, the small protrusions of the slide grooves 24a, 25a are formed on the cutout portions 3b, 3b (Fig. (Not shown) is pressed until they engage with each other to integrate. At this time, the lower end of the conical coil spring 27 in the Y direction is located at the outer frame yoke 13.
The movable insulating core 20 may be locked to the support shaft portion 2a of the movable iron core 2, and therefore the movable insulating core 20 may be pressed while the movable iron core 2 is slightly moved in the Y direction.

After that, when slide type adjusting springs 9 are slide-fitted into both end portions of the plate-shaped yoke 13b in the longitudinal direction, the assembling of internal components is completed. In this case, the leaf spring portion of the adjusting spring 9
9a abuts on the end surface of the support shaft portion 2a of the movable iron core 2, and cooperates with the conical coil spring 27 to apply upward returning force to the armature 1 and the movable insulating base 20.

The side cases 30 and 31 have the same shape that is symmetrical when the openings are overlapped with each other, and the positioning protrusion 30a and the positioning recess 30b are fitted together, and the engagement claws 32a are respectively provided on the upper end 30c. When the engaging recesses 32b are engaged with each other to combine them, a box shape having an opening on the Y-direction side is formed, while the Y'-direction side is separated by an insulating wall 33 orthogonal to the upper end 30c. The terminal storage portion 34 is formed.

In this terminal accommodating portion 34, a fixed groove 35 to which fixed contacts 35a and 35b are fixed and a coil terminal 36 are provided in an insulating wall 33 in a lateral groove portion.
After being press-fitted along 33a, it can be fixed by screw terminals 37, 37. It goes without saying that the screw terminals 37, 37 can electrically connect an external lead wire (not shown).

Furthermore, the side cases 30 and 31 have a pair of parallel protruding walls on the inner bottom surface.
38a, 38b, the distance between the inner side surfaces of the protruding walls 38a, 38b is equal to the width dimension l ₃ of the protrusions 13d, 13d provided on the bending yoke 13b, and the width dimension l ₄ of the permanent magnets 14, 14 and It is also equal to the minimum width dimension l ₅ of the plate yokes 15, 15. The distance between the outer surfaces of the projecting walls 38a, 38b is equal to the distance l ₆ between the inner surfaces of the collar portions 11a, 11b provided on the spool 11.

In addition, the spool 11 is Z
A step 38c (the rear side is not shown) for positioning in the -Z'-axis direction is provided.

On the other hand, on both inner side surfaces of the side cases 30 and 31, the outer frame yoke 13
Is provided with a pair of protrusions 38d, 38d for locating in the XX'-axis direction, and a guide protrusion 38e for guiding the outer frame yoke 13 is provided.

Therefore, in order to assemble the electromagnet device 10 in which the movable insulating base 20 is integrally connected to the side cases 30 and 31, first, the outer frame yoke 13 is positioned by the guide protrusion 38e provided on the side case 30, and the protrusions 38d, The outer frame yoke 13 is pressed in the Z direction along the 38d, the protruding portion 13d of the outer frame yoke 13 is fitted between the protruding walls 38a and 38b, and the notch 13e is fitted to the protruding wall 38b. X-
Position in the X'-axis direction and the Y-Y'-axis direction. Then, the spool 11 is arranged so that the projecting walls 38a, 38b are sandwiched between the inner surfaces of the collar portions 11a, 11b, the spool 11 is positioned in the YY 'axis direction, and the collar portions 11a, 11b are located on the Z direction side. The side end surface of the is contacted with the step 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 which is press-fitted and fixed in the relay terminal holding portion 17 for electrical connection, and the movable insulating base 20 The slit portion 29 of is fitted and positioned in the insulating wall 33 protruding inward of the side case 30, and the movable contact 35a and the fixed contact 22a
The movable contact 35b and the fixed contact 22b are arranged so as to face each other.

Next, the lower ends of the permanent magnets 14 and the inner plate yoke 15 are sequentially pushed along the inner side surface of the outer frame yoke 13 between the projecting walls 38a and 38b,
The spool 11 is positioned in the XX 'axis direction. At this time, the both end surfaces of the inner plate yoke 15 in the YY 'axis direction are movable iron pieces.
The inner surfaces of 3 and 4 face each other so that they can contact each other at a predetermined interval.

Then, the other side case 31 remaining in the side case 30 from above,
Engaging claw 32a, engaging recess 32b and positioning projection 30a, recess 30b
When combined and integrated via, spool 11, outer frame yoke 1
3. 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 connecting the side cases 30 and 31, and has an annular protrusion 41 that surrounds the opening on the upper surface thereof. An engaging claw 42 that engages with an engaging hole 38f provided in the lower portion of 31 is projected upward. Further, rail mounting groove portions are provided on both sides in the longitudinal direction of the lower surface of the bottom case 40 on the Y direction side,
The rail locking pieces 46, 46 are connected by a thin portion 47 having a substantially U shape. Further, holes 44 for attachment to the panel board surface are formed at the four corners of the bottom case 40.

Therefore, for assembly, after positioning the engaging claws 42 along the guide groove portions 38g of the side cases 30 and 31, the bottom case 40 may be pressed to engage the engaging claws 42 with the engaging holes 38f. .

The terminal protection cover 50 is provided with a positioning groove 53 that fits into the upper end portions 30c of the side cases 30 and 31 at the center in the longitudinal direction of the lower surface on the Y direction side, and the side cases 30 are provided 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 walls 33 provided in the terminals 31 are arranged side by side so as to face each other. Then, hemispherical small projections 54, 54 that fit into the fitting grooves 38h provided on the inner side surfaces of the side cases 30, 31 are provided on both end surfaces of the terminal protection cover 50 orthogonal to the XX 'axis direction. ing.

Therefore, when assembling, the positioning groove 53 and the slit 51 are arranged from above from the upper end portion 30c of the side cases 30 and 31 and the insulating wall 33.
After they are fitted and positioned, the small protrusions 54 may be fitted into the fitting grooves 38h by pressing from above.

Next, the operation of this embodiment will be described.

When the coil 12 is not excited, the movable insulating base 20 is returned in the Y'direction by the spring force of the conical coil spring 27 and the adjusting spring 9, and the movable contact 22a is separated from the fixed contact 35a. The movable contact 22b closes the fixed contact 35b.

Then, when the coil 12 is excited to move the armature 1 in the Y direction, the movable insulating base 20 moves the armature 1 via the holding portions 24 and 25.
And the movable contact 22a moves in the Y direction integrally with the fixed contact 35a.
While 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 in this embodiment are shown in the graph of FIG. In addition, in this graph, the spring load is drawn with the direction of action reversed for easy understanding.

In FIG. 4, A indicates the contact load of the three normally open contacts 35a,
B shows the contact load of one normally closed contact 35b. C shows the spring load of the operating spring 8, and D shows the spring load of the conical coil spring 27. E represents the spring load of the adjusting spring 9, Ea is the maximum value when the effective length of the leaf spring portion 9a is shortened, and Eb is the minimum value when the effective length is increased. F represents the total load which is the sum of the above spring loads, Fa is the total load when adjusted to Ea, Fb is the total load when adjusted to Eb, and the adjustable range is It is represented by diagonal lines in FIG. G is a permanent magnet when the coil is not excited 1
4, 14 shows the attractive force, and H shows the attractive force when the coil rated current is applied. Further, I is a moving ampere turn, that is, the attraction force at the operating voltage, J is the attraction force at the return voltage when the full load load is Fa, and K is the return voltage when the full load load is Fb. Shows the suction power of.

In the above-described embodiment, the matching between the attraction force characteristic of the electromagnet device 10 and the applied load basically depends on the spring force between the conical coil spring 27 and the operating spring 8, but the adjustment spring 9
Slides to make contact with the end face of the support shaft portion 2b.
Adjustment is possible by changing the effective distance of. The restoring force is given by the conical coil spring 27 and the adjusting spring 9, and the operating spring 8 gives an 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 20-30%, the permanent magnets 14,1
Assuming that the suction force by 4 is constant, the total load at the operating position can be adjusted even if it fluctuates up and down by a difference of 10% of the rated voltage.

By the way, in the above-mentioned embodiment, the spring means for applying the restoring force is divided into two spring members, the conical coil spring 27 and the adjusting spring 9, and the adjusting spring 9 is the plate-like yoke 13.
The spring force (returning force) can be adjusted by changing the positions in the directions of arrows X and X ′ with respect to b and changing the effective length of the leaf spring portion 9a. Therefore, the spring force can be easily adjusted with the springs 27 and 9 incorporated in the electromagnet device 10, and the return force is shared by the two springs 27 and 9, so that the spring constant of the adjusting spring 9 is small. It is possible to make adjustments at a minute level so that it can be completed.

Further, the conical coil spring 27 and the operating spring 8 are both mounted between the electromagnet device 10 and the movable insulating base 20 or the armature 1 so as not to be engaged with and held by the housing members such as the side cases 30 and 31. Not in. The adjustment spring 9 is slidably mounted on the plate-shaped yoke 13b of the electromagnet device 10. In other words, these spring means are installed independently of the housing member, which is advantageous in terms of positional accuracy and allows the operation characteristics to be measured and adjusted before the housing member is assembled. Moreover, there is no possibility that the spring force will change due to deformation of the housing member after adjustment.

EFFECTS OF THE INVENTION As is clear from the above description, according to the present invention, the spring means for applying the restoring force to the armature and the movable insulating base is divided into two spring members, and one spring member is movable. A plate-shaped cantilever spring that exerts a spring force in the axial direction of the iron core, and
It is a sliding type adjustment spring that can adjust the length of the arm, and by sliding it, the length of the arm can be changed to adjust the spring force, so the return force can be adjusted in the assembled state, and The spring constant is small because it is distributed to two spring members, and it is possible to make adjustments on a minute level.
Most suitable for polarized type magnetic contactors.

[Brief description of drawings]

The drawings show an embodiment of an electromagnetic contactor according to the present invention.
The drawing is an exploded perspective view, FIG. 2 is a partial front sectional view, FIG. 3 is a front view of a spool, and FIG. 4 is a graph showing operating characteristics. DESCRIPTION OF SYMBOLS 1 ... Armature, 9 ... Adjusting spring, 9a ... Leaf spring part, 10 ... Electromagnet device, 20 ... Movable insulating stand, 22a, 22b ... Movable contact, 27 ... Cone coil spring, 35a, 35b ... Fixed contact.

Claims (1)

[Claims] 1. An electromagnetic contactor in which a fixed contact is opened and closed by a movable contact provided on a movable insulating base that reciprocates via an armature based on the excitation and demagnetization of an electromagnet device. The spring means for applying the restoring force is divided into two spring members, and one spring member is
An electromagnetic contactor characterized in that it is a plate-shaped cantilever spring in which a spring force acts in the axial direction of a movable iron core, and a slide type adjustment spring that can adjust the arm length.