JPS5926102B2 - electromagnetic contactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an electromagnetic contactor, and particularly to an electromagnetic contactor suitable for miniaturization.

[Background of the invention]

Conventional contactors mainly use pneumatic contactors that operate using air pressure, but they require a compressor to generate air pressure, and because they have an air cylinder, the cylinder and piston need to be lubricated. Therefore, electromagnetic contactors that require less maintenance and inspection have been adopted recently.

However, this electromagnetic contactor has a structure in which the electromagnetic operating section, movable contact section, and fixed contact section are each fixedly supported on the same side of one insulating base, and the base itself deteriorates over time. I have experienced errors in the gap between the movable contact and the fixed contact, and in the operating voltage of the operating coil, due to warping of the target and incorrect installation level of the mating surface.

In addition, when it comes to miniaturization, in order to arrange each part on the same surface, the dead space for aligning the mounting surfaces of each part increases.
This has the disadvantage that the entire electromagnetic contactor becomes larger.

[Purpose of the invention]

A first object of the present invention is to provide a highly reliable electromagnetic contactor that can eliminate problems caused by warping over time of an insulating base that supports each component, or by out-of-level mounting of the mating surface.

A second object of the present invention is to provide an electromagnetic contactor in which each component can be effectively arranged to reduce the overall size.

Furthermore, a third object of the present invention is to provide an electromagnetic contactor that can quickly open a movable contact when an overcurrent is detected.

[Summary of the invention]

In order to achieve the above first and second objects, the present invention consists of an insulating base made of two bases, and each of the electromagnetic operation part, the movable contact part, and the fixed contact part is sandwiched between the two bases. This eliminates warping over time on a single insulating base and mounting problems such as the gap between the movable and fixed contacts and the operating voltage of the operating coil due to the level of the mating surface. Since it is not necessary to arrange the above-mentioned parts on the same plane, and they can just be clamped as they are, there is little dead space for installation, and the overall size can be reduced accordingly.

Further, in order to achieve the third object of the present invention, a trip portion is provided on the back of the movable contact portion to detect an overcurrent in the circuit and operate the movable contact in the opening direction.

[Embodiments of the invention]

An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 12.

The electromagnetic contactor according to the embodiment of the present invention consists of an electromagnetic operating part, a movable contact part, a fixed contact part, and a trip part, and these parts are all made of a left insulating base 1 and a right insulating base made by molding or the like. 2 (see Figures 3 and 4).

The electromagnetic operation section is shown in Figures 1, 7, 11, and 12.
As shown in the figure, a shortened yoke 3 is attached to each insulating base 1.
, 2 are supported by fastening screws 3a, 3aVc from both end faces thereof.

An iron core 5 through which an operating coil 4 is inserted is supported in this yoke 3 by fastening screws or fastening poles 5B and 5a.

The head 5b of the iron core 50 magnetically attracts the movable armature 6 movably supported by the support shaft 7 against the return spring 8.

A trip movable element 9 is also movably supported on this support shaft 7.

A second support shaft 10 is provided at the farthest position from the support shaft 7 of the trip movable element 9, and around this support shaft 10, a hook 11 provided at the tip of the movable armature 6 and a trip movable Child 9's.

A launch mechanism is provided consisting of a launch 12 provided at the tip and a return spring 13 for the hook 11.

In FIG. 1, the operating coil 4 is in a demagnetized state, but in this state, the latch 12 is returned to the hook 11 via the support shaft 10 and is caught by the clockwise load of the spring 13.

Therefore, in this state, the movable armature 6 on the hook 11 side and the trip movable element 9 on the launch 12 side are integrally engaged, so that the magnetic attraction of the iron core 5 causes the same operation as that of the movable armature 6. It will be done.

This is the electromagnetic operation section.

Next, the movable contact portion will be explained with reference to FIGS. 1.3 and 8.11.

The operating force generated by the electromagnetic operating section is applied to a V-bar 14.1 connected to the trip movable element 9 via both ends of a support shaft 100.
At 4, the support member 16 is coupled to a support shaft 16a of a support fitting 16 which is rotatably supported by a support shaft 15 provided on the base 51 of the movable contact portion.

A contact base 17 on which a movable contact 18 is fixedly supported is rotatably supported on the support fitting 16 by a support shaft 17a.

On the other hand, the wipe spring 19 not only applies a contact load to the movable contactor 18, but also serves as a return spring for the trip movable element 9 connected to the V-bar 14.

When the movable armature 6 is rotated toward the core head 5b, that is, counterclockwise, by the excitation of the operating coil 4, the trip movable element 9 engaged by the launch mechanism is rotated at the same time.

Therefore, the bars 14, 14, which are rotatably supported by the support shaft 10, simultaneously move the movable contact 18, the contact base 17, and the support metal fitting 16 in a circular arc about the support shaft 15 while resisting the wipe spring 19. Operate.

This operation brings the movable contact 18 into contact with the fixed contact 20, and this continues until the movable armature 6 finishes magnetic attraction.

This is the movable contact portion.

Next, as shown in FIGS. 1 and 9, the fixed contact part includes an input terminal 22a, a blowout coil 22 which is wound the required number of times around the blowout coil iron core 21, and other terminals 22 of this blowout coil 22.
b, and a fixed contact block 23 electrically connected to this terminal 22b.
and the fixed contact 2 mounted on this fixed contact base 23 and swung.
It is composed of 0.

The switching current is input terminal 22a - blowing coil 22 - terminal 2
2b - flows through the fixed contact base 23 to the fixed contact 20, from this fixed contact 20 through the movable contact 18 in contact with the contact, to the flexible conductor 24, to the terminal 24a, and is led to the next trip section.

This is the fixed contact portion. The trip device is
．． 10.11 As shown in FIG.
The current is received from a, flows to the trip coil 25 wound a required number of times, and is led to the terminal 25b through the conductor 25a.

The iron core 3 through which the trip coil 25 is inserted is formed into a substantially U-shape, and a trip armature 27 is rotatably supported at one end via a support shaft 26.

This rotatably supported trip armature 27 resists the return spring 28 due to the excitation of the trip coil 25, and the above-mentioned iron core 3
magnetically attracted to the other end of 1.

An insulating bar 29 is fixed to the trip armature 27, and the magnetic attraction of the trip armature 27 causes the tip of the insulating bar 29 to move one end of the trip rod 30 back against the spring 32. ing.

Triploside 30 is shown in Figure 7A. As shown in the figure, it is inserted through the through hole 3b of the yoke 3 of the electromagnetic operation section, the groove 5c of the iron core 5, and the through hole 5d so as to be freely movable.

This is the trip device.

The other end of the trip and 30 is connected to the first L 12
As shown in the figure, this is also the spindle 1 explained in the electromagnetic operation section.
Since one end 12b of the launch 12, which is rotatably supported at 0, is strongly pressed, the latch 12 returns counterclockwise and rotates against the spring 13.

As a result, the trip movable element 9 is connected to the hook 1 of the movable armature 6.
1 and rotate clockwise.

At this time, the solid contacts 18 and 20 change from the closed state to the open state.

Naturally, it is necessary to design a contactor with a difference between the current value required for the trip operation and the rated current value for the contactor.

For example, the relative relationship is that the rated current is 40o1cm and the trip current value (fault current) is about 1000A.

Therefore, the return spring 28 has a load adjustment function and a scale engraved with the set value so that the trip operation does not occur in a steady state where the current is opened and closed below the nominal rated current value, and the required set value exceeds the rated value. A plate 33 (FIG. 3) is provided.

Now, detecting the fault current, the movable and fixed image contacts 18,
After 20 has finished opening, the centrifugal operation is automatically restored by demagnetizing the operating coil 4.

That is, when the operation coil 4 is demagnetized, the movable contact 6 is rotated clockwise under the load of the return spring 8 until it comes into contact with the trip movable element 9, but the hook 1 is turned as shown in FIG.
Since the sliding surface 11a of the latch 1 and the sliding surface 12a of the latch 12 are in light contact with each other even after tripping, the hook 11 and the latch 12 become engaged just before they come into contact, and the movable armature 6 and If the trip movable element 9 is integrally engaged and the operating coil 4 is energized again, the same operation can be repeated.

Arc treatment during opening of the movable and fixed contacts 18, 20 must be performed by the arc chute 40.

As shown in FIG. 1, the arc chute 40 is supported by a fastener 44 or the like via a support 43 to an insulating stand 45 that is firmly supported by a stopper 41 directly connected to the yoke 3.

In addition, the interlocking auxiliary contact 42 (third
In the figure, the movable armature 6 is installed so as to be interlocked with either or both of the trip movable element 9.

The first point of the present invention is that the main components consisting of four elements: the electromagnetic operation part, the movable contact part, the fixed contact part, and the trip part are sandwiched between the left and right walls of the two insulating bases 1 and 2. It is in.

In FIG. 2, the left insulating base 1 is shown.

As mentioned above, the counterbore holes 1b correspond to the fastening screws 3a and 3aVc of the yoke 3 of the electromagnetic operation part, and the hole 1c corresponds to the play hole for the fastening screw of the base 51 of the movable contact part.
The holes 1d and 1d correspond to play holes for fastening screws of the fixed contact block 23 of the fixed contact section, and the hole 1e is for a screw for fastening the iron core 31 of the trip device section via a spacing piece 31e (Fig. 10). Treat it as a play hole.

As described above, the configuration in which the main components are held between the two left and right insulating bases 1 and 2 has holes lb, lc, 1 when the base is viewed from the side.
d, 1el/cft Since the corresponding main parts can be set at the most ideal position, so-called waste does not occur.

Conventionally, as can be seen, a structure in which a single flat board is installed perpendicular to the plane of the paper in FIG. Since the mounting surfaces of the components and one board are aligned, the punt space will increase, making the whole thing larger.
There has been a problem where one board is affected by warping due to the novelty of the other mounting surface, but this invention does not have this effect.

The second point of the present invention is that, as shown in FIGS. 2 and 6, a U-shaped metal fitting 1a is provided which is held between both insulating bases 1 and 2.

When the entire contactor is mounted on a storage box frame or panel, the direction of this mounting surface is 90 degrees different from the insulating bases 1 and 2, so it is necessary to change the direction.
, 1a was solved with a new structure in which one each was placed in the upper and lower tiers.

Bases 1 and 2 have surfaces IB that are in contact with the mounting surface of the box frame hall board.

2B, and this part can be easily made by resin molding or the like at the same time as the protrusions IC and 2C.

A metal fitting 1a is fitted between the second protrusions ID and 2D so as to surround the protrusions IC and 2C.

Therefore, when fastening the main parts mentioned above, this metal fitting 1a
, 1a, if you fit it into the blade, it will not fall off after it is fastened.

If the metal fittings 1a, 1a in this state are fastened to the box frame or panel by passing the fastening bolts through the mounting holes 1H, they will be sandwiched between the contact surfaces IB, 2B of the base, so the base and contactor The whole can be firmly fixed to the box frame or board.

The third point of the present invention is that the insulating base 1,
There are small protrusions IE and 2E provided in 2.

That is, the first protrusion IC, 2C and the second protrusion ID
, strength, notch effect (notch effect) in the 2D connecting groove
In order to reduce the roundness, the roundness of this groove is
If the end face 1f of a is pushed in too strongly, it will damage the base, so at the bottom of this groove, a small protrusion IE that does not have a rounded surface in contact with the end face 1f.

2E, and an end face 1f and each small protrusion IE.

A gap G is provided between 2B.

G) By setting it to 0, 1, - the protrusion IC of the base,
Care has been taken to prevent damage such as scratches on the contact surface between 2C and metal fitting 1D.

When the gap G becomes large enough to spread out, the metal fitting 1a moves from side to side, and when it is fastened to the box frame f, the point of application of force is different between the two bases, which tends to increase the unbalance, so 1rIrrrL
The following are preferred.

With the mounting structure configured as described above, even if the mounting surface of the box frame is slightly distorted, the dimensional relationship of the main parts held by the bases 1 and 2 will not be disturbed, so it will not disturb the dimensional relationship of the main parts held by the bases 1 and 2. Problems (d) can be resolved quickly and high-precision functionality can be expected to be maintained.

The fourth point of the present invention is the novel arrangement of the electromagnetic operation part, the movable contact part, the fixed contact part, and the trip part, and the flexible conductor 24.
and the trip coil 25 are directly connected to each other.

That is, the three element parts of the electromagnetic operation part, the movable contact part, and the fixed contact part are stacked in order from the bottom to the top, so-called in series, and the trip is placed on the back side of the movable contact part, which is the middle part. The reason lies in the fact that the department has been arranged.

By arranging the trip section, which has the same potential as the movable contact section, on the back of the movable contact section, the distance between the flexible conductor 24 and the trip coil 25 becomes short, so that the electric power generated by the switching control current flowing through each conductor here is reduced. This has the effect of reducing losses.

Furthermore, since they are at the same potential, there is no need to provide electrical insulation, air gaps, or creepage distances from each other, resulting in additional effects of miniaturization and weight reduction.

Conventionally, a plunger-type electromagnetically operated system has been considered and used in which the overcurrent trip device, referred to as the trip section, is installed behind the trip rod 30. As a result, the plunger part protrudes from the overall structure, and the conductor has to be lengthened, resulting in an increase in size.

Further, the back of the movable contact portion becomes a dead space, creating wasted space.

As described above, according to the present invention, the distance between each conductor in the electromagnetic contactor can be shortened, so power loss can be reduced by shortening the conductors.

Furthermore, as an additional effect, the entire structure of the contactor can be made smaller and lighter.

The fifth point of the present invention is shown in detail in FIG.

Regarding the insulating bases 1 and 2, as described above, it has been explained that they hold the yoke 3 of the electromagnetic operation section, the base 51 of the movable contact section, and the fixed contact base 23 of the fixed contact section, respectively.
The insulating bases 1 and 2 are provided with holes φ1 passing through the thickness Ll of the plates.

On the other hand, an engaging portion having a diameter φ2 and a length L2 is provided on both ends 21a of the blowout coil core 210, and this retaining portion is fitted and supported in the hole φ°1 of both the insulating bases 1 and 2. ing.

The dimensional relationship between the hole φ1 of the insulating base and the diameter φ2 of the engaging portion is set such that φ2>φ1 so that they fit together,
Further, the dimensional relationship between the thickness Ll of the insulating base and the length L2 of the engaging portion is set such that L2>Ll.

That is, the core end surface 21a is a surface that protrudes from the thickness of the base 1.

A surface 40b of a magnetic iron plate 40a, which is integral with the arc chute 40, is brought into light contact with this end surface 21a.

In FIG. 5, only the insulating base 1 side is shown in detail, but the insulating base 2 has exactly the same structure.

According to the above structure, the iron core 21 is positioned at the winding center of the blowout coil 22, and the end face 2 of the blowout coil iron core 21
A reliable structure in which 1a is brought into contact with the magnetic iron plates 40a, 40a can be obtained.

That is, in the conventional example, specially prepared insulating plates and two dedicated side plates on the left and right sides were required on both sides of the fixed contact base fixed to the board of the entire contactor, but according to the present invention, these two side plates are required. Since there is no need for a dedicated side plate, the number of parts can be reduced.
There are also significant benefits in terms of costs resulting from the reduction.

The sixth point of the present invention lies in the miniaturization resulting from the new arrangement of the trip rod 30 and the stability resulting from the structure of the yoke 3, iron core 5, and iron core head 5b that guide it.

That is, in Fig. 7 A1, a rad 30 is attached to the yoke 3.
A hole 3b is provided to guide the iron core 5, and a groove 5c is provided in the iron core 5 through which the iron and dowel 30 are inserted.

This groove 5c may be a hole, but a groove is better in terms of workability.

A hole 5d is provided in the core head 5b.

The holes 3b and 5d at both ends serve as guides, and the groove 5c is simply an escape groove for allowing the rod 30 to move freely in its longitudinal and circumferential directions.

A stepped portion 30a is provided at the tip of the rod 30, and the rod 3 is arranged so that the stepped portion 30a is always in contact with the core head suction surface 5b.
0, a return spring 32 and a receiver 32a are provided at the other end.

As described above, the rod 30 is loosely guided by the holes 3b and 5d at substantially both longitudinal ends, resulting in a stable structure.

In addition, since the structure is such that the center portions of the operating coil 4, yoke 3, and iron core 5 are inserted through, unlike the conventional structure in which the operating coil 4 is provided so as to be circumscribed on the outside, it is not susceptible to any external force. It is able to perform stable functions without losing its function due to damage or deformation due to exposure.

Furthermore, since the rod 30 can be placed inside the existing yoke 3, iron core 5, and operating coil 4, it is possible to make the structure smaller.

The present invention has great effects in terms of miniaturization and stability.

The seventh point of the present invention lies in the relative positional relationship between the blowout coil 22 and the trip coil 25, as shown in FIGS. 9 and 10.

That is, the switching current flows from the terminal 22a through the blowing coil 22 wound around the iron core 21, and is led to the other terminal 22b.
From the fixed contact base 23 to the fixed contact 20 and the movable contact 18
, a flexible conductor 24, from the terminal 24a of this conductor to the trip coil 25, from the conductor 25a to the terminal 25b.

Now, if the terminal 22a is the positive pole of the blowing coil 22, the magnetic flux φ□ will be in the direction of the magnetic flux from the back side to the front side in the drawing, according to the right-handed screw rule.

This magnetic flux φ1 is guided to the main contactor 18, 20 by the magnetic iron plate 40a.

The magnetic flux φ2 of the trip coil 25 excited by the same current is:
According to the right-handed screw rule, magnetic flux is generated from the cloth to the left in the iron core 2↓.

Therefore, since the magnetic fluxes φ1 and φ2 are in clear directions, they are not affected by so-called differential or summation.

Therefore, even if the iron core 21 is magnetically saturated due to excessive current and leakage magnetic flux is generated, the magnetic flux generated by the trip coil is
Since there is no interference, it can be expected that the overcurrent trip operation scale setting value will operate at a stable value.

〔Effect of the invention〕

As explained above, the insulating base is composed of two bases, and each part of the electromagnetic contactor is sandwiched between these two bases, so it is possible to obtain a small and highly reliable electromagnetic contactor. In addition, there is a trip section on the back of the movable contact section that detects overcurrent in the circuit and operates the movable contact in the opening direction, so the circuit is immediately opened in the event of an overcurrent to prevent damage to the equipment. be able to.

[Brief explanation of drawings]

The drawings all show an electromagnetic contactor according to an embodiment of the present invention. Fig. 1 is an overall front view of the electromagnetic contactor, Fig. 2 is a front view of the insulating base, and Fig. 3 is a diagram showing the left half of the arc. Figure 4 is the left side view of Figure 1, Figure 5 is the top view of Figure 1, Figure 6 is A1, and C is Figure 5. Figure 7A shows the details of part A, which is a partially cutaway view, left side view, and front view of the metal fittings, and Figure 7A9 shows the details of the electromagnetic operation section and part A-A. Figure 8 is a front view showing details of the movable contact part, Figure 9 is a front view showing details of the fixed contact part and trip device, and Figure 10 is a front view showing details of the trip device. The front view, FIG. 11A, and FIG. 12 are side views showing the operating state of the launch mechanism of the trip portion. 1.2...Insulating base, 4...Operation coil, 5...
Fixed iron core, 6... Movable armature, 7... Support shaft, 8...
・Return spring, 9...Trip mover, 11...Lunch, 12...Hook, 14...Brim 518...
Movable contact, 20... Fixed contact, 21... Fixed iron core, 22... Blowing coil, 24... Flexible conductor, 25...
...Trip coil, 27...Trip armature, 28
...Return spring, 29...Insulation lever, 30...Trip rod.

Claims (1)

[Claims] 1. An electromagnetic operation having a first iron core, an operating coil wound around the first iron core, and a movable armature that is attracted to the first iron core by energizing the operating coil. a movable contact portion having a movable contact portion, a first actuation mechanism actuated by the suction operation of the movable armature, and a movable contact actuated by the operation of the first actuation mechanism; A fixed contact for closing a circuit, a second iron core for magnetically blowing out an arc generated when the fixed contact and the movable contact open, and the fixed contact wound around the second iron core. In the electromagnetic contactor, the electromagnetic contactor includes: a fixed contact portion having a blowing coil connected to the blowing coil; and an insulating base holding the electromagnetic operation portion, the movable contact portion, and the fixed contact portion. An electromagnetic contactor characterized in that the insulating base is composed of two bases, and the electromagnetic operation section, the movable contact section, and the fixed contact section are held between the two bases. 2. An electromagnetic operating section including a first iron core, an operating coil wound around the first iron core, and a movable contact that is attracted to the first iron core by energizing the operating coil, and the movable armature. a movable contact portion having an actuation mechanism that is actuated by the suction action of the actuator, a movable contact that is driven by the actuation of the actuation mechanism, and a fixed contact that contacts the movable contact to close a circuit. a second iron core for magnetically blowing out an arc generated by an open circuit between the fixed contact and the movable contact; and a blowing coil wound around the second iron core and connected to the fixed contact. An electromagnetic contactor comprising: a fixed contact part having a fixed contact part; and an insulating base holding the electromagnetic operation part, the movable contact part, and the fixed contact part,
A trip unit is provided to detect an overcurrent in the circuit and operate the movable contact in the opening direction, and the insulating base is composed of two bases, and these two bases are used to connect the electromagnetic operating unit and the movable contact. An electromagnetic contactor characterized in that a contact portion, the fixed contact portion, and the trip portion are sandwiched. 3. In claim 2, the movable contact section is disposed above the electromagnetic operating section, the fixed contact section is disposed above the movable contact section, and the trip is disposed on the back of the movable contact section. An electromagnetic contactor characterized by arranging parts. 4. In claim 2, the trip section includes a trip coil connected to the movable contact section, a third iron core inserted into the trip coil, and a third iron core inserted into the trip coil by energizing the trip coil. An electromagnetic contactor comprising: a second operating mechanism that is attracted by a third iron core and operates the movable contactor in the opening direction. 5. The electromagnetic contactor according to claim 4, wherein the trip coil and the blowout coil are arranged such that the directions of their magnetic fluxes are relatively perpendicular to each other. 6. In claim 4, the second actuation mechanism includes a trip armature that is magnetically attracted to the third iron core, and an insulating lever that is integrally attached to the armature of the third iron core.
An electromagnetic contactor comprising a trip rod interlocked with the insulating lever, and a trip movable element that operates the movable contactor by the operation of the trip rod. 7. In claim 6, the trip movable element includes a magnetic bow on the seventh iron core;
1. An electromagnetic contactor comprising a launch mechanism that engages and follows when the trip rod is activated, and that can release the engagement by the operation of the trip rod. 8. The electromagnetic contactor according to claim 6, wherein the trip rod is movably inserted into a through hole provided in the first iron core. 9. Claim 6 is characterized in that the trip part has an elastic body between the trip armature and the third iron core that can set a trip operation value when an overcurrent is detected. electromagnetic contactor.