JPH11185584A - Movable contact support for electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the performance of a contact by preventing the occurrence of the thermal deformation and blister in a movable contact storage. SOLUTION: For a movable contact support for an electromagnetic contactor, a movable contact storage 6 which has a storage hole 9 to store a movable contact with a movable contact point at the end via a contact spring is provided, the movable contact being stored to be slidable in the vertical direction in the condition that the movable contact point is protruded from the opening of the storage hole 9 and both sides in the cross direction contact the inner face of a wall at both sides of the storage hole 9, so that the movable contact storage 6 can approach/separate to/from a fixed contact point for opening/ closing the contact point. In this case, a chamfer 12 is applied to the opening edge of the storage hole 9 along the sliding direction of the movable contact so that an area, where both sides in the cross direction of the movable contact cannot contact each other, is provided at the end of the opening on the inner face of the wall on both sides of the storage hole 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable contact support for accommodating, together with a contact spring, a movable contact of an electromagnetic contactor used for opening and closing control of a motor.

[0002]

2. Description of the Related Art As a conventional movable contact support for an electromagnetic contactor of this type, for example, those shown in FIGS. 6 to 10 are known.

The movable contact support a includes a support b and a movable contact accommodating portion c attached to the support b at three places (in the case of three phases) at substantially equal intervals in the horizontal direction in FIG. Prepare. The movable contact accommodating portion c has a rectangular accommodating hole d formed therein, and the accommodating hole d has a plate-like movable contact e.
(Or f (see FIG. 10)) is supported and stored via a contact spring g. In the housed state, the movable contact e
In the state where the movable contact h provided on the lower surface of the end of the movable contact e is protruded from the opening of the storage hole d, and the both sides in the width direction are in contact with the inner surfaces of both side walls of the storage hole d. It is slidable up and down. Then, by performing excitation and demagnetization of the electromagnet portion i disposed below the support b,
The support base b and, consequently, the movable contact accommodating portion c are moved up and down via the movable iron core j, whereby the movable contact h comes into contact with or separates from the fixed contact k fixedly arranged facing the movable contact h. Contacts are opened and closed.

[0004]

However, in the conventional movable contactor support of the electromagnetic contactor, the load current at the time of contact opening / closing is large, or a current larger than a normal load current due to frequent contact opening / closing frequency. When energized, the heat of the overheated movable contact e is transmitted to the movable contact housing c through the sliding surface of the housing hole d, and as a result, the movable contact housing c is thermally deformed. This causes inconvenience that the movable contact e is not smoothly slid due to the occurrence of heat and expansion, which causes welding of the movable contact e.

Further, as shown in FIG. 6, a movable contact support a in which a movable contact h is incorporated is constituted by a support base b and a three-phase movable contact housing c. The movable contacts h are separated from each other by partitioning ribs m projecting downward from the ceiling surface of the case, and the ribs m prevent the arc generated at the time of opening and closing the contacts from flowing into the adjacent movable contact h. I try to prevent it.

Therefore, the rib m needs to have a length that covers the sliding range of the movable contact h. However, since the length of the rib m is limited, the movable contact h is disposed above the movable contact h. It is necessary to wrap the h and the rib m, and as a result, there is a disadvantage that the position of the movable contact h is regulated and the height of the electromagnetic contactor is increased.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned inconvenience, and an electromagnetic contactor capable of improving the contact performance by preventing the movable contact accommodating portion from being thermally deformed or expanded. It is an object to provide a movable contact support.

Another object of the present invention is to prevent the arc generated at the time of opening / closing the contact from flowing into the adjacent movable contact as well as the height of the electromagnetic contactor. It is an object of the present invention to provide a movable contactor support of an electromagnetic contactor capable of reducing the size of the movable contactor.

[0009]

In order to achieve the above object, a movable contact support of an electromagnetic contactor according to claim 1 is provided.
The movable contact includes a movable contact storage portion having a storage hole for storing a movable contact provided at an end portion via a contact spring,
The movable contact is slidable in the thickness direction with the movable contact protruding from the opening of the storage hole and with both widthwise sides contacting the inner surfaces of both side walls of the storage hole. The movable contact holder of the electromagnetic contactor is configured to open and close the contact by moving the movable contact storage portion toward and away from the fixed contact, wherein an opening edge of the storage hole is the movable contact. The movable contact is provided with a portion that does not come into contact with both ends in the width direction of the movable contact at end portions on the opening side of the inner surfaces of both side walls of the storage hole. .

According to a second aspect of the present invention, there is provided a movable contact support for an electromagnetic contactor according to the first aspect, wherein the movable contact accommodating portions are arranged at a plurality of locations at predetermined intervals, and each movable contact accommodating portion is adjacent to each other. A partition plate is provided between the portions to prevent an arc generated when the contacts are opened and closed from flowing into the adjacent movable contact.

According to a third aspect of the present invention, there is provided the movable contactor support of the electromagnetic contactor according to the first or second aspect, wherein the movable contactor accommodating portions are arranged at a plurality of locations at a predetermined interval, and each movable contactor is adjacent to each other. The child accommodating portions are integrally connected by connecting pieces.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory cross-sectional view for explaining a movable contact support of an electromagnetic contactor according to an embodiment of the present invention, and FIG. 2 is an explanatory perspective view for explaining a shape of a movable contact housing. 3, FIG. 3 is a sectional view taken along line III-III of FIG. 2, FIG. 4 is an explanatory perspective view for explaining the shape of the movable contact, and FIG. 5 is an explanatory perspective view for explaining a modification of the movable contact. It is.

In the electromagnetic contactor 1, a movable contact support 3 is disposed in an upper part of a case 2, and an electromagnet part 4 is disposed in a lower part. The movable contact support 3 includes a support base 5 and movable contact storage portions 6 attached to the support base 5 at three locations (in the case of three phases) at substantially equal intervals in the horizontal direction in FIG. The movable contact accommodating portion 6 is formed with a vertically long accommodation hole 9 having a rectangular shape.

A clearance groove 10 narrower than the storage hole 9 is formed on the bottom surface of the storage hole 9 so that the clearance groove 10 is formed.
Step surface 1 between the inner surfaces of both sides of the storage hole 9 and the inner surfaces of both sides of the storage hole 9
1 is formed. The movable contact 7 is placed on the step surface 11 so as to be movable vertically in the storage hole 9, and the movable contact 7 is attached downward between the movable contact 7 and the top surface of the storage hole 9. A biasing contact spring 8 is interposed. As shown in FIGS. 2 and 3, an opening edge on the long side of the storage hole 9 is provided with a chamfer 12 along the up-down direction.
Relief portions 13 (portions in which both side portions in the width direction of the movable contact 7 do not contact) are formed at the ends on the opening side of the inner surfaces of both side walls of the storage hole 9.

The movable contact 7 has a long plate shape,
As shown in the figure, the end in the longitudinal direction is a movable contact mounting portion 15 having a square shape, the movable contact 16 is mounted on the lower surface of the mounting portion 15, and the central portion in the longitudinal direction is formed narrow and has an elongated portion. It is set to 14. The elongated portion 14 is a portion that is placed on the step surface 11 of the storage hole 9, and its longitudinal dimension is substantially the same as the axial dimension of the storage hole 9, and the width dimension is the width direction of the storage hole 9. (Left-right direction). Thus, the movable contact 7 slides up and down with the movable contact 16 protruding from the opening of the storage hole 9 and with both sides in the width direction contacting the inner surfaces of both side walls of the storage hole 9. It is stored movably. In the stored state,
The corners 17 of the movable contact 7 at the connection position between the movable contact mounting portion 15 and the elongated portion 14 are not in contact with the inner surfaces of both side walls of the storage hole 9 due to the presence of the escape portion 13 described above.

Referring to FIGS. 1 and 2, movable contacts 15 arranged at three positions in the left-right direction are separated from each other by two partition plates 18 attached to middle movable contact housing 6. Thus, the arc generated at the time of opening and closing the contact is prevented from flowing into the adjacent movable contact 15. The two partition plates 18 are attached to the surface of the movable contact storage portion 6 on the side where the storage holes 9 are opened so as to be parallel to each other with the opening interposed therebetween. The length in the vertical direction is the same as or longer than the opening / closing stroke of the movable contact 15.

Further, three movable contact accommodating portions 6 adjacent to each other are integrally connected by a connecting piece 19. The connecting piece 19 is located at the center of the movable contact housing 6 in FIG.
Over the entire length of each movable contact housing 6 in the vertical direction between the movable contact housing 6 and the left movable contact housing 6 and between the middle movable contact housing 6 and the right movable contact housing 6. Is interposed.

The movable contact support 3 having the above-described structure excites and demagnetizes the electromagnet section 4 disposed below the support table 5 so that the support table 5 and, consequently, the movable contact storage section 6 allow the movable iron core 20 to move. The movable contact 15 contacts or separates from a fixed contact (not shown) disposed opposite to the movable contact 15 to open and close the contact. When the movable contact 15 comes into contact with the fixed contact, the movable contact 7 moves inside the accommodation hole 9 through the contact spring 8.
Relative upward movement against the urging force.

If the load current at the time of contact opening / closing is large, or if the contact switching frequency is high and a current larger than the normal load current is applied, the heat of the movable contact 7 that has been overheated is stored in the storage hole 9. Is transmitted to each movable contact housing 6 through the inner surfaces (sliding surfaces) of both side walls.

In this embodiment, the corner 17 of the connecting position between the movable contact mounting portion 15 and the elongated portion 14 of the movable contact 7 comes into contact with the opening end of the inner surface of both side walls of the storage hole 9. Since the escape portion 13 is provided, the amount of heat transmitted from the movable contact 7 to the movable contact housing 6 via the sliding surface is reduced. As a result, it is possible to secure smooth sliding of the movable contact 7 without causing thermal deformation and expansion in the movable contact accommodating portion 6, and to improve contact performance. In this case, only the opening edge of the storage hole 9 needs to be chamfered, so that the contact performance can be improved at low cost.

Further, since the movable contacts 15 arranged at three locations are separated from each other by the two partition plates 18 attached to the middle movable contact accommodating section 6, an arc generated at the time of opening and closing the contacts is reduced. It can be prevented from flowing into the movable contact 15, and as a result, unnecessary heat transfer to the adjacent movable contact accommodating portion 6 is suppressed, and the contact performance can be further improved. In this case, since the partition plate 18 is attached to the movable contact accommodating portion 6, the height of the movable contact 15 is not restricted as in the related art. The height of the vessel can be reduced.

Further, each movable contact accommodating portion 6 is provided with a connecting piece 19.
In particular, in this embodiment,
Since the side walls of the storage hole 9 where deformation is apt to occur are also integrally connected, deformation of the movable contact storage part 6 due to heat and cracks caused by the deformation can be favorably prevented.

In the above embodiment, the movable contact 7
In this embodiment, a corner 17 is provided at the connecting position between the movable contact mounting portion 15 and the elongated portion 14, but instead of this, as shown in FIG.
The one provided with the R portion 22 at the connection position with the fourth member 4 may be used, or the movable contact f shown in FIG. 10 may be used.

[0024]

As is apparent from the above description, according to the first aspect of the present invention, the portion where the both sides in the width direction of the movable contact do not come into contact with the opening-side ends of the inner surfaces of the side walls of the storage hole. Since the amount of heat transmitted from the movable contact to the movable contact housing through the sliding surface can be reduced, the movable contact housing can be thermally deformed or expanded. As a result, smooth sliding of the movable contact can be ensured, and the effect of improving the contact performance can be obtained.

Further, since the contact performance can be improved only by chamfering the opening edge of the storage hole, the effect that the contact performance can be improved at low cost can be obtained.

According to the second aspect of the present invention, in addition to the first aspect of the invention, the movable contacts arranged at a plurality of locations are separated from each other by the partition plate, so that the arc generated at the time of opening and closing the contacts is reduced by the adjacent movable contacts. It is possible to prevent the contact from flowing into the contact, and as a result, it is possible to obtain an effect that unnecessary heat transfer to the adjacent movable contact storage portion is suppressed, and the contact performance can be further improved. Further, by attaching the partition plate to the movable contact housing, it is possible to prevent the height position of the movable contact from being restricted, so that the height of the electromagnetic contactor can be reduced.

According to the invention of claim 3, according to claim 1 or 2,
In addition to the above invention, since the movable contact housings are integrally connected by the connection piece, the deformation of the movable contact housing due to the heat and the cracks caused by the deformation can be effectively prevented. can get.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view for explaining a movable contact support of an electromagnetic contactor which is an example of an embodiment of the present invention.

FIG. 2 is an explanatory perspective view for explaining a shape of a movable contact housing portion.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is an explanatory perspective view for explaining the shape of a movable contact.

FIG. 5 is an explanatory perspective view for explaining a modification of the movable contact.

FIG. 6 is an explanatory perspective view for explaining a movable contact support of a conventional electromagnetic contactor.

FIG. 7 is an explanatory perspective view for explaining a shape of a conventional movable contact housing portion.

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7;

FIG. 9 is an explanatory perspective view for explaining the shape of a movable contact.

FIG. 10 is an explanatory perspective view for explaining the shape of a movable contact.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic contactor 3 ... Movable contact support 6 ... Movable contact accommodating part 7 ... Movable contact 8 ... Contact spring 9 ... Accommodating hole 12 ... Chamfer 13 ... Escape part 16: movable contact 18: partition plate 19: connecting piece

Claims (3)

[Claims] A movable contact receiving portion having a receiving hole for receiving, via a contact spring, a movable contact provided at an end of the movable contact, wherein the movable contact stores the movable contact in the receiving hole. The movable contact accommodating portion is fixedly contacted with the movable contact accommodating portion so as to be slidable in the thickness direction in a state where the movable contact accommodating portion protrudes from the opening of the contact hole and the both side portions in the width direction are in contact with the inner surfaces of both side walls of the accommodating hole. In the movable contactor support of the electromagnetic contactor which is configured to open and close the contact by moving toward and away from the movable contactor, the opening edge of the storage hole is chamfered along the sliding direction of the movable contactor, A movable contact support for an electromagnetic contactor, wherein a portion of the movable contact at which both sides in the width direction do not contact each other is provided at an end of the inner side of each side wall of the storage hole on the opening side. 2. The movable contact accommodating portion is disposed at a plurality of positions at a predetermined interval, and an arc generated at the time of opening / closing a contact between adjacent movable contact accommodating portions is applied to the adjacent movable contact. 2. The movable contactor support for an electromagnetic contactor according to claim 1, further comprising a partition plate for preventing inflow. 3. The movable contact accommodating portions are arranged at a plurality of positions at a predetermined interval, and adjacent movable contact accommodating portions are integrally connected by a connecting piece. 2. The movable contact support of the electromagnetic contactor according to 2.