JPH0148604B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic relay for interrupting large currents in which a conductive plate with electrical contacts is held by an insulating substrate.

[Conventional technology]

This type of electromagnetic relay, which is small and is capable of interrupting large currents (several amperes to several tens of amperes), has large contacts and a flat conductive plate, and the fixed contact plate, which is made by bending the flat conductive plate, is insulated. It has a structure that is inserted into and fixed to the board.

As an example of such an electromagnetic relay, the same applicant has disclosed Japanese Patent Application No. 17364/1983 (Japanese Patent Application No. 176025/1983).
The structure described is proposed. This structure will be explained with reference to FIGS. 5 and 6a and b. A structure is shown in which a make contact plate 910, a break contact plate 920, a movable contact plate 930, an iron core 940, an armature 950, and a yoke 960 are incorporated into an insulating substrate 900.

The insulating substrate 900 includes a lower substrate 901, an upper substrate 902, and fixed contact plate holding parts 903M and 903.
B, and has a cylindrical shaft portion 904, and has an iron core 9 inside.
A lower substrate 901 and an upper substrate 902 are arranged parallel to each other at both ends of a cylindrical shaft portion 904 that passes through the cylindrical shaft portion 40 and is wound with an excitation winding 941 on the outside. ,90
It has 3B. The holding parts 903M and 903B are the make contact plate 910 and the break contact plate 920.
hold each of the

The make contact plate 910 is made by punching a conductive flat plate into a predetermined shape, and has a make contact 911 as a fixed contact at one end and an insertion part (not shown) into the lower substrate 901 together with a contact circuit extraction terminal 913 at the other end. ) and a held part 912 held by the holding part 903M of the upper substrate 902 in the middle part, and both ends thereof are bent in the same direction to form parallel surfaces so that the holding part 912 is held at a predetermined position. Like the make contact plate 910, the break contact plate 920 is formed by punching a conductive flat plate into a predetermined shape, providing a break contact 921, a held portion 922, and a lead-out terminal 923, and bending the plate so as to arrange it at a predetermined position. be done.

The movable contact plate 930 is formed by punching a flat plate of an elastic conductor into a predetermined shape, has a movable contact 931 at one end, and attaches the flat plate of the armature 950 at a position facing the upper end of the iron core 940 substantially parallel to the central axis of the iron core 940. The intermediate portion 932 is fixed to the yoke 960, and the other end is used as a lead-out terminal 933 to draw out a contact circuit. The movable contact 931 at the tip of the movable contact plate 930 applies a force to move the armature 950 away from the iron core 940 due to the elasticity of the flat plate described above, and the break contact 920
It has stopped at

The yoke 960 is L-shaped, and one surface of the L-shape is fixed and magnetically coupled to the lower end of the iron core 940 through the lower substrate 901, and the other surface of the L-shape is connected to the intermediate portion 932 of the movable contact plate 930. Note that the dotted line indicates the cover.

In operation as an electromagnetic relay, when a current is supplied to the excitation winding 941, the armature 950 is attracted to the iron core 940 and drives the movable contact plate 930 to separate the movable contact 931 from the break contact 921 and bring it into contact with the make contact 911. . Therefore, when the current supply to the excitation winding 941 is interrupted, the movable contact 9
31 makes a reciprocating motion. Cutting a large current at a contact causes an arc and scatters contact evaporates, as shown in Figure 6a.
Evaporative deposits occur, which are indicated by the symbols R.S in FIG. 6b and by the symbols P.Q in FIG. 6b.

[Problem that the invention seeks to solve]

The conventional electromagnetic relay mentioned above prioritizes miniaturization,
The holding part and iron core of the board are placed close to the movable and fixed contacts, and the inner wall of the cover is also placed close to them, so contact evaporation that accumulates from the corners due to the disconnection of a large current is transferred to the movable contacts. There was a problem in that the circuit and the fixed contact circuit were electrically short-circuited.

[Means for solving problems]

The electromagnetic relay of the present invention includes a cylindrical shaft portion having an iron core penetrated inside and an excitation winding wound outside, and a holder provided almost perpendicularly to the upper end of the cylindrical shaft portion for holding a fixed contact plate to be described later. an insulating substrate having an upper substrate having a section and a lower substrate provided almost perpendicularly to the lower end of the cylindrical shaft section and into which a fixed contact plate to be described later is inserted and fixed; magnetically coupled and fixed to the lower end of the iron core; a yoke; a movable contact plate having a movable contact at one end, an armature fixed to a position facing the upper end surface of the iron core, and the other end fixed to the yoke;
a contact arm portion that includes a fixed contact that faces the movable contact and is bent approximately parallel to the upper substrate; a held portion that is held and fixed to a holding portion of the upper substrate; and an insertion portion that is inserted and fixed to the lower substrate. fixed contact plates on a make side and a fixed contact plate on a break side, respectively; The upper substrate has a shape that connects the holding portion with a predetermined length and width, and maintains a wide distance between the make-side fixed contact plate and the break-side fixed contact plate when they are inserted into the substrate. a notch portion formed by cutting out a part of a side wall extending from the holding portion in the direction of the cylindrical shaft portion; and a partition wall that partitions the contact portion of the fixed contact plate held by the upper substrate and the upper end of the iron core. It is characterized by having the following.

Further, the electromagnetic relay of the present invention includes a cylindrical shaft portion having an iron core passed through the interior thereof and an excitation winding wound on the outside, and a fixed contact plate provided substantially perpendicularly to the upper end of the cylindrical shaft portion to be described later. an upper substrate including a holding part;
an insulating substrate having a lower substrate provided almost perpendicularly to the lower end of the cylindrical shaft portion and into which a fixed contact plate to be described later is inserted and fixed; a yoke magnetically coupled and fixed to the lower end of the iron core; a movable contact at one end; a movable contact plate having an armature fixed at a position facing the upper end surface of the iron core and having the other end fixed to the yoke; a fixed contact facing the movable contact and extending substantially parallel to the upper substrate; a bent contact portion; a held portion held and fixed to the holding portion of the upper substrate;
fixed contact plates on the make side and the break side each having an insertion portion inserted and fixed into the lower substrate; a partition wall having a shape to cover the tip of the held portion of the make side fixed contact plate from above; and a cover having a partition wall that covers the contact arm portion of the break-side fixed contact plate from above and partitions a space from the make-side fixed contact plate.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, one embodiment of the present invention includes a substrate 100, a make contact plate 110 that is one fixed contact plate, a break contact plate 120 that is the other fixed contact plate, and a movable contact plate 130. , excitation winding 1
41, an armature 150, and a yoke 160.

Referring to FIG. 2a, the board 100 includes a lower board 101, an upper board 102, holding parts 103M and 103B, a cylindrical shaft part 104, a make contact support part 105, a partition wall 106, and a side wall 107.
, a notch 108 , and a cover guide groove 109 . A lower substrate 101 and an upper substrate 102 are provided parallel to each other at both ends of the cylindrical shaft portion 104. Holding parts 103M and 103B protrude from both sides of one end of the upper substrate 102, and the upper surfaces of the bases of these holding parts 103M and 103B serve as a make contact support part 105 where a make contact, which is one of the fixed contacts, is arranged. Part 103M and 1
03B and the make contact support part 105 form a U-shape. A partition wall 106 is provided between the make contact support portion 105 and the cylindrical shaft portion 104.
One end is connected to the holding part 103M by the side wall 107, and the other end of the partition wall 106 is connected to the holding part 103B.
A notch 108 is provided between the two. Partition wall 10
A cover guide groove 109 is provided in the center of both sides of the upper substrate 102 near both ends of the upper substrate 102 . side wall 1
07 forms a thin plate shape perpendicular to the upper substrate 102,
The space above the make contact support part 105 is expanded. The tip surfaces of the holding parts 103M and 103B are
It has a shape in which a flat plate that is perpendicular to the upper substrate 102 is pushed in a direction parallel to the upper substrate surface and is fitted and held.

Referring to FIG. 2b, the make contact plate 110
The make contact 111, the held part 112, the contact arm part 113, the pull-out terminal 114, and the central part 11
5 and an insertion section 116. The make contact plate 110 is formed by punching out a single conductive flat plate, and is provided on one side of the central portion 115 and is connected to the upper substrate 1.
It has a held part 112 that fits into the holding part 103M of 02 (see FIG. 2 a), and a contact arm part 113 that is arranged parallel to this held part 112.
A make contact 111 is provided at the tip of 13. On the other side of the central portion 115 is a long and narrow lead-out terminal 11.
4, and an insertion portion 116 with a short surface parallel to this extraction terminal 114. The contact arm portion 113, the pull-out terminal 114, and the insertion portion 116 are bent at right angles in the same direction at the boundary line with the center portion 115, and the pull-out terminal 1
The distal end portion of 14 is further bent at a right angle parallel to the central portion 115 and downward.

Referring to FIG. 2c, the break contact plate 120
is a break contact 121, a held part 122,
The contact arm portion 123, the pull-out terminal 124, and the central portion 1
25 and an insertion section 126. The break contact plate 120 is formed by punching out a single conductor flat plate, and has a held part 122 on the central axis and a central part 12.
5. The held portion 122 is the upper substrate 10
2 (see FIG. 2 a),
A contact arm portion 1 is provided on the opposite side of the central portion 125 from the joint portion.
23, and is further provided with a break contact 121 at the tip. The contact arm 123 with the break contact 121 is shaped like the number "7".
The other end of the central part 125 has an elongated lead-out terminal 124 and an insertion part 126 that is shorter than the lead-out terminal 124 and arranged in parallel. Break contact plate 12
0 is bent at a right angle at the joint line between the held part 122 and the contact arm part 123 and the joint line between the central part 125 and the pull-out terminal 124 and the insertion part 126, and the tip of the pull-out terminal 124 is bent at a right angle. In addition, it has a shape that is bent downward parallel to the surface of the central portion 125 .

Make contact plate 110 and break contact plate 12
0, the respective held parts 112 and 122 are connected to the holding parts 103M and 103B of the upper substrate 102.
and is fixed to the substrate 100 by pushing the respective insertion portions 116 and 126 into the grooves on the edge of the lower substrate 101 in the direction of the excitation winding 141, respectively. Due to this fixation, the make contact 111 and the break contact 121 are arranged parallel to the central axis of the cylindrical shaft portion 104 of the substrate 100.

As shown in FIGS. 3a and 3b, the movable contact plate 130 is made by punching out a thin plate of conductive spring material, has a square-shaped hole in the center, and has one end of the center part. A contact arm 132 extends with a narrow width and has a movable contact 131 at its tip, and a narrow pull-out terminal 134 extending in the opposite direction to the contact arm 132 and a hole are provided at the other end of the center part. Each has a wide contact spring portion 133 extending inward. The movable contact plate 130 has a shape bent approximately at a right angle approximately at the center of the square-shaped hole.

The iron core 140 is inserted into the cylindrical shaft portion 104 of the substrate 100 as shown in FIG.
It is excited by energizing the excitation winding 141 wound around the coil 04.

The armature 150 is a flat plate made of magnetic material, and the contact arm portion 132 is formed on the bent inner surface of the movable contact plate 130.
The contact plate 130 is fixed to the movable contact plate 130 covering the area from the bending line to the bending line, and the end side at the bending line is pressed by a contact spring portion 133.

The yoke 160 is an L-shaped magnetic plate, and one end is fixed and magnetically coupled to the iron core 140 on the lower surface of the lower substrate 101, and the other end is attached to the upper substrate 102 on the opposite side of the holding parts 103M and 103B. The movable contact plate 130 and the contact spring portion 133 are fixed near their bases. Further, the tip of the other end of the yoke 160 is in contact with the armature 150 and is magnetically coupled to the yoke 160. Armature 1
50 indicates the iron core 140 at the lower surface position of the contact arm portion 132.
The movable contact 131 maintains a position facing and away from the upper surface of the break contact 121 .

When the excitation winding 141 is energized, the iron core 14
0 is excited and the armature 150 is attracted to the iron core 140, so the movable contact 131 separates from the break contact 121 and comes into contact with the make contact 111 (FIG. 2b). Since a large current flows through the contacts, the connection/disconnection of the current as the contacts open and close generates an arc and scatters contact vapors.

Make contact plate 110 and break contact plate 1 as explained in FIGS. 2a, b and c.
The central portions 115 and 125 of the contact arm 1
The lengths of 13 and 123 and the U-shaped gap in the upper substrate 102 allow the contact evaporates to fall to the lower substrate 101. The partition wall 106 of the upper substrate 102 prevents contact vapors from accumulating between the core 140 and the make contact 111 and shorting the circuit. Since the distance between the side wall 107 of the upper substrate 102 and the contact arm portion 113 is wide, a short circuit between the make contact plate 110 and the movable contact plate 130 due to accumulation is less likely to occur. Also,
The cutout portion 108 widens the space in which the contact portion is arranged,
Prevents contact evaporation from depositing. The notch 108 also makes it easier to pinch the contact arm 123 with a tool such as a bench when adjusting the pressure resistance of the break contact 121 by changing the bending angle of the contact arm 123.

Next, FIGS. 4a and 4b are plan sectional views (B
-B sectional view) and a side sectional view (A-A sectional view). As shown in these figures, the cover 200 has guide protrusions 201 and 202 and partition walls 203 and 2.
04. The guide protrusion 201 has a predetermined length to be inserted into the cover guide groove 109 of the upper substrate, and the guide protrusion 202 has a predetermined length that is inserted into the cover guide groove 109 of the upper substrate.
It has a short length that fits into the groove of the tip of 3B.
The partition wall 203 covers the contact arm portion 123 of the break contact plate 120 and prevents contact evaporated matter flying from the contact portion from being directly hit. The dividing wall 204 covers the tip of the held portion 112 of the make contact plate 110 and protects it from scattering of contact evaporates.

Although the dimensions of each part were not mentioned in the above embodiment, the length and width may be increased under the condition that the specified relay life is long. Also, depending on the length of the service life, part of the structure may be left as is. Although the shape has been illustrated and explained, it is not limited to the above description as long as it satisfies the function.

〔Effect of the invention〕

As explained above, the electromagnetic relay of the present invention has contact arms of a predetermined length on the make contact plate and the break contact plate, and a U-shaped gap in which the fixed contact plate holding portion is protruded from the upper substrate. The space between the reinforcement part and the contact plate, the notch in the upper board reinforcement part, the partition wall between the contact and the iron core, the break contact plate contact arm part of the cover, and the make contact plate holding part of the cover. Providing at least one of the tip partition walls has the effect of preventing short-circuit failures due to scattering and accumulation of contact evaporates and achieving a long life.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIGS. 2 a, b, and c are all perspective views showing the main parts of FIG. 1, and FIGS. 3 a and b are plan views of FIG. 1, respectively. 4a and 4b are respectively a plan sectional view and a side sectional view of the embodiment shown in FIG. 1 with a cover attached, FIG. 5 is a perspective view showing the conventional example, and FIG. 6 a and b are a front view and a side sectional view of FIG. 5, respectively; 100...Substrate, 101...Lower substrate, 102
... Upper substrate, 103M, 103B ... Holding part,
106, 203, 204...partition wall, 107...
Side wall, 108... Notch, 109... Cover guide groove, 110... Make contact plate (fixed contact plate), 1
11...Make contact (fixed contact), 112, 12
2...Holded part, 113, 123, 132... Contact arm part, 115, 125... Central part, 120...
Break contact plate (fixed contact plate), 121...break contact (fixed contact), 130...movable contact plate,
131...Movable contact, 140...Iron core, 141...
...Excitation winding, 150... Armature, 160...
...York, 200...Cover.

Claims (1)

[Scope of Claims] 1. A cylindrical shaft portion with an iron core passing through it and an excitation winding wound on the outside, and a holder provided substantially perpendicularly to the upper end of the cylindrical shaft portion to hold a fixed contact plate to be described later. an insulating substrate having an upper substrate having a section and a lower substrate provided substantially perpendicularly to the lower end of the cylindrical shaft section and into which a fixed contact plate to be described later is inserted and fixed; magnetically coupled and fixed to the lower end of the iron core; a yoke; a movable contact plate having a movable contact at one end, an armature fixed at a position facing the upper end surface of the iron core, and the other end fixed to the yoke; a fixed contact facing the movable contact; A make-side contact arm and a break-side contact arm bent approximately parallel to the upper board, a held part that is held and fixed to the holding part of the upper board, and an insertion part that is inserted and fixed to the lower board. In an electromagnetic relay having respective fixed contact plates, each of the contact arm portions of the make side fixed contact plate and the break side fixed contact plate has a predetermined length and width between the fixed contact and the held portion. the make side fixed contact plate and the break side fixed contact plate have a shape that maintains a wide distance between them when inserted into the board, and the upper board is connected from the holding part to the cylindrical shape. An electromagnetic relay characterized in that it has a cutout portion that is a part of a side wall extending in the axial direction, and a partition wall that partitions the contact portion of the fixed contact plate held on the upper substrate and the upper end of the iron core. . 2. An upper board comprising a cylindrical shaft portion having an iron core passed through it inside and an excitation winding wound on the outside, and a holding portion provided almost perpendicularly to the upper end of the cylindrical shaft portion and holding a fixed contact plate to be described later. and an insulating substrate having a lower substrate provided substantially perpendicularly to the lower end of the cylindrical shaft portion and into which a fixed contact plate to be described later is inserted and fixed; a yoke magnetically coupled and fixed to the lower end of the iron core; a movable contact plate having a movable contact and having an armature fixed at a position facing the upper end surface of the iron core and having the other end fixed to the yoke; a movable contact plate having a fixed contact facing the movable contact and substantially attached to the upper substrate; Fixed contact plates on each of the make side and the break side, each having a contact arm portion bent in parallel, a held portion held and fixed to the holding portion of the upper substrate, and an insertion portion inserted and fixed to the lower substrate; a space between a partition wall having a shape that covers the tip of the held portion of the make-side fixed contact plate from above and the make-side fixed contact plate that covers the contact arm portion of the break-side fixed contact plate from above; An electromagnetic relay characterized by comprising: a partition wall that partitions the walls; a cover having;