JP4135475B2 - Electromagnetic relay - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic relay.
[0002]
[Prior art]
Conventionally, as an electromagnetic relay, a coil block formed by winding a coil around an iron core via a spool is placed on a base so that the axial direction of the iron core is orthogonal, and a movable contact piece and a fixed contact piece are opposed to each other. Then, a space is formed between the base and the coil block, and the movable contact piece is operated at the other end of the movable iron piece by sucking and separating one end of the movable iron piece from the suction surface of the iron core in the space. In some cases, the movable contact of the movable contact piece is brought into and out of contact with the fixed contact of the fixed contact piece (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
A microfilm of Japanese Patent Application No. 59-119997 (Japanese Utility Model Application No. 61-35349)
[Problems to be solved by the invention]
However, the conventional electromagnetic relay has a problem that there are few exposed portions of the movable iron piece and it is difficult to appropriately detect the operation state. That is, the amount of pushing (contact follow) after the movable contact is brought into contact with the fixed contact is automatically measured using a load cell or a laser displacement meter, so that the exposed portion of the movable iron If it is small, automatic measurement cannot be performed and it is difficult to cope with automatic assembly.
[0005]
In addition, in the conventional electromagnetic relay, when the base is covered and the inside is sealed, a heat sealing hole is formed on the top surface of the case, and the base is sealed with the bottom surface facing upward. After performing the work, it is necessary to heat seal the heat sealing hole repeatedly.
[0006]
Then, this invention makes it a subject to provide the electromagnetic relay provided with the heat sealing hole which can confirm the operation | movement of a movable iron piece and can be heat-sealed after a primary seal | sticker.
[0007]
[Means for Solving the Problems]
As a means for solving the above problems, the present invention provides:
A coil block formed by winding a coil around an iron core via a spool is placed on the base so that the axial center direction of the iron core is orthogonal, and a movable contact piece and a fixed contact piece are placed facing each other, and a case is placed on the base. A space is formed between the base and the coil block, and the movable contact piece is operated at the other end of the movable iron piece by sucking and separating one end of the movable iron piece from the suction surface of the iron core in the space. An electromagnetic relay in which the movable contact of the movable contact piece is brought into contact with and separated from the fixed contact of the fixed contact piece,
On the bottom surface of the base, a stand-off and a pedestal portion arranged to face the iron core are formed at the same height,
In the pedestal portion, a thin cylindrical portion that constitutes a part of the heat sealing hole by an annular groove is formed,
It is obtained by enabling check the operation state of the movable iron piece via the Netsufutomeana.
[0008]
With this configuration, by exciting and demagnetizing the coil block, the operation state when the movable iron piece is rotated can be inspected through the heat sealing hole. When the inspection is completed and the sealing operation is completed, the inside can be sealed by heat sealing the heat sealing hole.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the accompanying drawings.
[0011]
1 and 2 show an electromagnetic relay according to the present embodiment. This electromagnetic relay generally has a configuration in which a contact switching mechanism 2 and a coil block 3 are provided on a base 1 and covered with a case 4.
[0012]
As shown in FIGS. 8 to 10, the base 1 is partitioned into a coil block mounting portion 6 and a contact opening / closing mechanism mounting portion 7 by an insulating wall 5.
[0013]
The insulating wall 5 includes a partition portion 8 and both side portions 9. The partition portion 8 is formed with a ridge portion 10 extending vertically at a predetermined interval in the center. The protruding portion 10 reinforces the partition portion 8 and guides a card 100 described later with the upper end protruding portion 10a. An auxiliary insulating wall 11 is formed below the ridge 10 so as to form a recess with the insulating wall 5. A guide groove 11 a extending vertically is formed at the center of the inner surface of the auxiliary insulating wall 11. On the other hand, on both side portions 9, grooves 9a and 9b extending in the vertical direction with their positions shifted on the inner and outer surfaces are formed. The inner surface groove portion 9a is for guiding a yoke 30 to be described later, and the outer surface groove portion 9b is a fillet when the base 1 is molded.
[0014]
The coil block mounting portion 6 is partitioned by a partition wall 12 as shown particularly in FIG. A relief recess 13 is provided on the bottom surface of the partitioned insulating wall 12 side, and notches 14 are formed on both side walls. Further, as shown in FIGS. 2A and 2B, a heat sealing hole 110 is formed in the bottom center portion. The heat sealing hole 110 bulges from the bottom surface of the base 1 and is formed in a pedestal 111 having the same height as a standoff 1a described later. The pedestal portion 111 is formed with a thin cylindrical portion 113 that constitutes a part of the heat sealing hole 110 by the annular groove 112. The heat sealing hole 110 is located on the axis of the iron core 27 of the coil block 3 to be described later, and is heat-sealed as necessary after the electromagnetic relay is completed. On the other hand, a through hole 15 through which the coil terminal 42 is inserted is formed at both ends in the remaining part of the partition, and the partition wall 12 and the side wall at one end are continuous by the three base reinforcing ribs 16 formed therebetween. ing. When the base 1 is molded, the base reinforcing rib 16 plays a role of causing the resin to flow smoothly and reinforcing even if the bottom surface is thin. Further, the partition wall 12 and the base reinforcing rib 16 constitute a press-fitting receiving part 17 for press-fitting and fixing a thick part 41 of the coil block 3 to be described later.
[0015]
In addition, 1a is a stand-off, and when the electromagnetic relay is mounted on a printed board (not shown), a gap is formed between the bottom surface of the base 1 and the influence of solder during soldering work is eliminated.
[0016]
As shown in FIG. 8, the contact opening / closing mechanism mounting portion 7 has contact piece press-fit portions 18a, 18b, and 18c formed at three locations.
[0017]
The contact opening / closing mechanism 2 includes a first fixed contact piece 19, a movable contact piece 20, and a second fixed piece, which are sequentially press-fitted from one of the contact piece press-fit portions 18 a, 18 b, 18 c located on one end side (18 a). The contact piece 21 is configured.
[0018]
As shown in FIG. 3C, the first fixed contact piece 19 has a substantially flat shape, the first fixed contact 22 is provided at the upper end, and the protrusion for press-fitting into the contact piece press-in portion 18 at the lower end. A portion 19a is formed, and terminal portions 19b and 19c extend downward from both sides.
[0019]
As shown in FIG. 3 (b), the movable contact piece 20 is provided with a movable contact 23 having contact surfaces on both sides of the movable contact piece 20 with the fixed contacts 22 and 26. Card receiving portions 24a and 24b extending obliquely in the vertical direction are formed on the upper edge portion, respectively. The protruding dimensions of the card receiving portions 24a and 24b are values that prevent the card 100 described later from dropping even if the movable contact piece 20 is elastically deformed. An intermediate portion of the card receiving portions 24a and 24b constitutes a relief portion 25 so as not to get in the way when the second fixed contact piece 21 is inserted from above. Similarly to the first fixed contact piece 19, a press-fitting protrusion 20a is formed at the lower end, and terminal portions 20b and 20c are extended from both sides. Further, the central portion is bent in a crank shape, and a slit 20d is formed at the center thereof, so that it is easily elastically deformed.
[0020]
The second fixed contact piece 21 has a second fixed contact 26 fixed by caulking at an upper end portion thereof, and is bent in a crank shape from the vicinity thereof. As in the case of the contact pieces 19 and 20, the lower end is formed with a press-fitting protrusion 21a, the lower side of which is bent at a substantially right angle in the horizontal direction, and the terminal is directed downward from both ends of the bent portion. The parts 21b and 21c are extended. The second fixed contact piece 21 is attached to the base 1 while being guided by the guide groove 11 a of the auxiliary insulating wall 11. And, when the movable contact 23 is separated from the second fixed contact 26 by the auxiliary insulating wall 11, desired insulation (creeping distance) is ensured between the movable contact piece 20.
[0021]
As shown in FIGS. 4 and 5, the coil block 3 is obtained by winding a coil 29 around an iron core 27 via a spool 28.
[0022]
In the iron core 27, the yoke 30 is crimped and fixed at the upper end, and the lower end portion of the bowl shape is a suction surface 27a. The yoke 30 is made of a substantially L-shaped magnetic material, and has an opening 30a through which the iron core 27 is inserted and fixed by crimping at the center of one end, and a latch for attaching a hinge spring 31 to the other end side edge. A receiving portion 30b is formed. The other end of the yoke 30 serves as a rotation fulcrum, and the bent portion 33 is swingably supported while the substantially L-shaped movable iron piece 32 is held by the hinge spring 31. One end side of the movable iron piece 32 is a sucked portion 34 that is sucked by the suction surface 27a of the iron core 27, and a locking portion 35a is formed at the upper end of the narrow portion 35 on the other end side. The hinge spring 31 includes a locking portion 31 a that is locked to the locking receiving portion 30 b of the yoke 30, and a rectangular pressure contact portion 31 b that is inserted into the narrow portion 35 of the movable iron piece 32 and press-contacts the bending portion 33. The rectangular pressure contact portion 31 b is in pressure contact with the stepped portion 32 a of the bent portion 33 of the movable iron piece 32 and the curved surface 32 b, and the movable iron piece 32 is counterclockwise in FIG. 2, that is, the suctioned portion 34 b is the suction surface of the iron core 27. Energize in a direction away from 27a.
[0023]
A card 100 is disposed between the locking portion 35 a of the movable iron piece 32 and the card receiving portion 24 of the movable contact piece 20. As shown in FIG. 7, the card 100 is formed with a locking holding portion 36 that locks the locking portion 35 a of the movable iron piece 32 on one end side, and a pushing portion that pushes the card receiving portion 24 on the other end side. 37. The latch holding part 36 includes a contact piece 38 that abuts the latch part 35a of the movable iron piece 32 and an elastic holding piece 39 that elastically holds the latch part 35a from both sides. A gap is formed between the abutting piece 38 and the elastic holding piece 39, and the upper end protruding portion 10 a formed on the insulating wall 5 of the base 1 is positioned to guide the horizontal movement. The pushing portion 37 includes a thin portion 37a and guide pieces 37b that are located on both sides of the pushing portion 37 and are supported by the lower card receiving portion 24b. The distal end of the thin portion 37a is preferably configured with a tapered surface or a curved surface so as to be in surface contact with the card receiving portions 24a and 24b of the movable contact piece 20. The thin portion 37a is reinforced by a card reinforcing rib 40 having a substantially E shape in plan view, and the upper and lower card receiving portions 24a and 24ba of the movable contact piece 20 are in contact with the upper and lower surface edge portions, respectively. The card reinforcing rib 40 not only reinforces the thin-walled portion 37a but also smoothes the resin flow when the card 100 is molded, and prevents the occurrence of problems such as short shots. The guide piece 37b guides the upper card receiving portion 24a on both sides.
[0024]
As shown in FIGS. 4 and 6, the spool 28 has a cylindrical shape through which the iron core 27 is inserted, and includes flange portions 28 a and 28 b at both ends. Protrusions 28c are formed at three locations on the upper edge 28a, and the yoke 30 is guided. A thick portion 41 is formed in the lower end flange portion 28b. A terminal hole 41a into which the coil terminal 42 is press-fitted is formed in the thick part 41, and an annular recess 43 is formed around the terminal hole 41a on the bottom surface side. When the coil block 3 is mounted on the base 1, the thick portion 41 is press-fitted into the press-fitting receiving portion 17 of the base 1, stores the sealing agent that enters from the through hole 15, and prevents further penetration. .
[0025]
The coil 29 is wound around the body of the spool 28, and both ends are wound around the coil terminal 42, respectively.
[0026]
As shown in FIG. 13, the case 4 has a substantially box shape with the lower surface opened, and covers the components by fitting the lower surface opening edge to the side surface of the base 1. As shown in FIG. 2, a first projecting portion 45 and a second projecting portion 46 projecting inward are formed on the corner portion and the substantially central portion of the base 1, respectively. The first protrusion guides the yoke 30, and the second protrusion 46 restricts the movement range of the card 100.
[0027]
Then, the assembly method of the said electromagnetic relay is demonstrated.
[0028]
The coil block 3 is formed in a separate process. That is, as shown in FIG. 4, a coil 29 is wound around an iron core 27 via a spool 28, and both ends of the coil 29 are wound around coil terminals 42 that are press-fitted and fixed to a thick portion 41. One end portion of the yoke 30 is caulked and fixed to the upper end portion of the iron core 27, and a movable iron piece 32 is swingably disposed on the other end portion of the yoke 30. The movable iron piece 32 is attached to the yoke 30 by a hinge spring 31 and biased so as to be separated from the suction surface 27a of the iron core 27. Thereby, the coil block 3 shown in FIG. 5 is completed.
[0029]
As shown in FIG. 9, the movable contact piece 20, the first and second fixed contact pieces 19 and 21 are press-fitted and fixed to the base 1, and the completed coil block 3 is assembled as shown in FIGS. 10 and 11. . The coil block 3 is fixed by press-fitting the thick part 41 into the press-fit receiving part 17 and press-fitting both side parts 9 of the yoke 30 into the inner groove part 9a. In this state, a space is formed between the base 1 and the coil block 3, and a rotating space for the movable iron piece 32 is secured. However, the height dimension of the electromagnetic relay is suppressed by the relief recess 13 formed in the base 1. Each contact piece is press-fitted and fixed to the base 1 in the order of the first fixed contact piece 19, the movable contact piece 20, and the second fixed contact piece 21. When the second fixed contact piece 21 is first press-fitted, the movable contact piece 20 cannot be press-fitted due to the bent portion. Therefore, the second fixed contact piece 21 is press-fitted and fixed after the movable contact piece 20 is press-fitted. In this case, the card receiving portion 24 is formed on the upper end portion of the movable contact piece 20, but the second fixed contact 26 does not interfere with the escape portion 25.
[0030]
When the press-fitting and fixing of the coil block 3 and the contact pieces 19, 20, and 21 to the base 1 are completed, as shown in FIG. 12, the engagement holding portion 36 of the card 100 is engaged with the engagement portion 35 a of the movable iron piece 32. Stop. That is, if the latch holding part 36 is pressed from the side of the latch part 35a, the elastic holding piece 39 is elastically deformed, and then returns to its shape. 35a is held. Further, after the movable contact piece 20 is elastically deformed, the shape is restored, so that the thin portion 37a of the card 100 is positioned between the upper and lower card receiving portions 24 formed on the upper end portion of the movable contact piece 20. . As shown in FIGS. 14 and 15, the card 100 prevents the card 100 from dropping in the vertical direction, and the guide piece 37 b formed on the card 100 prevents the positional deviation in the width direction.
[0031]
When the card 100 is attached, the coil 29 is energized through the coil terminal 42, and the coil block 3 is excited and demagnetized to rotate the movable iron piece 32. Whether or not the movable iron piece 32 is appropriately sucked by the suction surface 27a of the iron core 27 is confirmed by visual observation, laser, or the like through the notch portion 14 formed in the base 1. The rotational movement of the movable iron piece 32 can also be confirmed by a load cell or a laser displacement meter through the heat sealing hole 110. At this time, it is checked whether or not the contacts are properly opened and closed, and the presence or absence of malfunction is inspected. If there is a malfunction, adjustment work is performed by deforming the movable contact piece 20 or the like.
[0032]
For those with good operation, as shown in FIG. 13, a case 4 is fitted to the base 1 to cover the components. And it repeats so that the bottom face of the base 1 goes upwards, and a terminal hole, the fitting part of the base 1 and the case 4 etc. are sealed with a sealing agent using a nozzle etc. The sealing agent penetrates into the inside by capillary action. The sealant that enters from the gap between the terminal portions 19b, 19c, 20b, 20c, 21b, 21c of each contact piece 19, 20, 21 and the terminal hole is far away from the region where the contact opens and closes, and enters the base 1. Increase the fixing strength of the contact piece. The sealing agent that enters from the gap between the coil terminal 42 and the through hole 15 is stored in the annular recess 43 formed in the thick part 41 of the coil block 3, and further intrusion is prevented. Even if it penetrates beyond the annular recess 43, the presence of the partition wall 12 does not reach the drive region of the movable iron piece 32. Therefore, even if the drive region of the movable iron piece 32 is positioned in the vicinity of the region where the sealing agent enters, there is no problem due to adhesion or the like.
[0033]
Thus, the electromagnetic relay is completed, but even in this state, it can be confirmed whether the movable iron piece 32 is properly rotated through the heat sealing hole 110 formed in the base 1 as described above. . If it is confirmed that the movable iron piece 32 is properly rotated, the heat sealing hole 110 can be used with the heat sealing hole 110 opened as it is depending on the use environment, or it can be heat sealed and used in a sealed state. Can be. Even if an impact force acts on the internal components due to dropping or the like, since each component is firmly fixed to the base 1, no malfunction occurs. In particular, the card 100 has a simple configuration in which only the movable iron piece 32 and the movable contact piece 20 are connected, but one end portion is connected to the movable iron piece 32 by the locking holding portion 36 and the other end portion is pushed. The thin portion 37a is guided by the portion 37 in the entire range where the movable contact piece 20 can be deformed. Further, an upper end protruding portion 10 a formed on the insulating wall 5 of the base 1 is located between the abutting piece 38 and the elastic holding piece 39 constituting the locking holding portion 36, and above the card 100. The 2nd protrusion part 46 formed in case 4 is located. Therefore, even if an impact force is applied, the card 100 does not fall off.
[0034]
Next, the operation of the electromagnetic relay will be described.
[0035]
In a state where the coil block 3 that is not energized to the coil 29 is demagnetized, the movable iron piece 32 is rotated counterclockwise around the rotation fulcrum at the tip of the yoke 30 in FIG. 2 by the biasing force of the hinge spring 31. It is rotating. Thereby, the movable contact piece 20 becomes an upright state by its own elastic force, and maintains the state in which the movable contact 23 is closed to the second fixed contact 26.
[0036]
When the coil 29 is energized, the coil block 3 is excited, and one end of the movable iron piece 32 is attracted to the suction surface 27a of the iron core 27. In FIG. To turn. Thereby, the card | curd 100 moves to the right direction and the movable contact piece 20 elastically deforms. In this case, since the card receiving portion 24 of the movable contact piece 20 is pressed by the tip of the thin portion 37a of the card 100, line contact or surface contact is made and no wear powder is generated. Then, the movable contact 23 is closed to the first fixed contact 22 by the movement of the card 100, and the contact is switched.
[0037]
In the above embodiment, the fixed contact pieces 19 and 20 are provided on both sides of the movable contact piece 20. However, the fixed contact pieces 19 and 20 may be provided only on one side. That is, as shown in FIG. 16, it is possible to cope with the configuration by not mounting only the second fixed contact piece 21, and other components can be used as they are.
[0038]
In the above embodiment, the guide piece 37b of the card 100 is provided separately from the card reinforcing rib 40. However, the card reinforcing rib 40 may be used in combination. That is, the card reinforcing ribs 40 located on both sides may be used to guide the both side parts 9 of the upper card receiving part 24. Moreover, the card | curd receiving part 24 of the movable contact piece 20 should just exist at least one each up and down, and if it is the structure which does not provide the 2nd fixed contact piece 21, it can also be formed in a center part.
[0039]
【The invention's effect】
As is clear from the above description, according to the present invention, the heat sealing hole is formed in the bottom surface of the base, and the operation state of the movable iron piece can be inspected through the heat sealing hole. Even when the movable iron piece is operated in the space formed between the coil block, the operating state of the movable iron piece can be automatically measured. Moreover, after performing the sealing work with the bottom surface of the base facing upward, the heat sealing hole may be heat sealed as it is, and the workability is excellent.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state where a case of an electromagnetic relay according to the present embodiment is removed.
FIG. 2A is a cross-sectional view of an electromagnetic relay according to the present embodiment.
FIG. 2B is a perspective view showing a state of the electromagnetic relay according to the present embodiment as viewed from the bottom side.
3A is a perspective view of a first fixed contact piece, FIG. 3B is a perspective view of a movable contact piece, and FIG. 3C is a perspective view of a second fixed contact piece.
FIG. 4 is an exploded perspective view of a coil block.
FIG. 5 is a perspective view of a coil block.
FIG. 6 is a perspective view from the bottom side of the coil block.
FIG. 7 is a perspective view of a card.
FIG. 8 is a perspective view of a base.
FIG. 9 is a perspective view showing a state in which each contact piece is assembled to a base.
FIG. 10 is a perspective view showing a state before the coil block is assembled to the base to which each contact piece is assembled.
FIG. 11 is a perspective view showing a state in which each contact piece and a coil block are assembled to a base.
FIG. 12 is a perspective view showing a state where each contact piece and a coil block are assembled to a base and a card is attached.
FIG. 13 is a perspective view of an electromagnetic relay.
FIG. 14 is a partial plan view showing a contact opening / closing mechanism.
FIG. 15 is a partial front view showing a contact opening / closing mechanism.
FIG. 16 is a perspective view of an electromagnetic relay according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Contact opening / closing mechanism 3 ... Coil block 4 ... Case 5 ... Insulating wall 6 ... Coil block mounting part 7 ... Contact opening / closing mechanism mounting part 12 ... Partition wall 13 ... Relief recessed part 14 ... Notch part 15 ... Through-hole 16 ... Base reinforcing rib 17 ... press fitting receiving part 18 ... contact piece press fitting part 19 ... first fixed contact piece 20 ... movable contact piece 21 ... second fixed contact piece 22 ... first fixed contact 23 ... movable contacts 24a, 24b ... card receiving part 25 ... relief part 26 ... second fixed contact 27 ... iron core 28 ... spool 29 ... coil 30 ... yoke 31 ... hinge spring 32 ... movable iron piece 33 ... bent part 34 ... suctioned part 35 ... narrow part 36 ... locking holding part 37 ... pushing part 38 ... contact piece 39 ... elastic holding piece 40 ... card reinforcing rib 41 ... thick part 42 ... coil terminal 43 ... annular recess 100 ... card 110 ... heat sealing hole

Claims (1)

A coil block formed by winding a coil around an iron core via a spool is placed on the base so that the axial center direction of the iron core is orthogonal, and a movable contact piece and a fixed contact piece are placed facing each other, and a case is placed on the base. A space is formed between the base and the coil block, and the movable contact piece is operated at the other end portion of the movable iron piece by sucking and separating one end portion of the movable iron piece from the suction surface of the iron core in the space. In the electromagnetic relay in which the movable contact of the movable contact piece is brought into contact with and separated from the fixed contact of the fixed contact piece,
On the bottom surface of the base, a standoff and a pedestal portion arranged to face the iron core are formed at the same height,
In the pedestal portion, a thin cylindrical portion that constitutes a part of the heat sealing hole by an annular groove is formed,
Electromagnetic relay, characterized in that to enable checking the operating state of the movable iron piece via the Netsufutomeana.

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