JPS6348375B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small relay that can be directly mounted on a printed circuit board.

This type of small relay is generally required to be small and easy to assemble, and particularly requires high sensitivity.
In order to meet these demands, various modifications have been made in the past, but in order to improve sensitivity it is basically necessary to increase the ampere turns of the electromagnetic magnet, so it is possible to improve the low power consumption characteristics without increasing the size. It was difficult to achieve high sensitivity characteristics while maintaining the same characteristics.

An object of the present invention is to provide a compact relay that has high sensitivity characteristics without increasing its size by supplementarily adding a relatively small magnetomotive force to an electromagnetic magnet.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a small relay according to an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of a main part of the relay.

1 is an iron core having a flange 1a formed at one end and a non-magnetic material 1 such as a plastic plate at the other end.
b is attached and inserted into the hollow hole of the bobbin 2 around which the coil is wound, thereby forming a magnetomotive force generating section of the main magnetic circuit. At one end of the bobbin 2, a flange 3 is provided.
A yoke fixing member 4 is fixed to the other end, and the yoke fixing member 4 has an insertion hole 4a of the iron core 1, a magnet storage part 4b, and an auxiliary magnetic circuit and a main magnetic circuit, as will be described in detail later. The vertical piece insertion hole 4c of the first yoke piece that constitutes a part and the vertical piece engagement groove 4d of the second yoke piece that constitutes a part of the main magnetic circuit.
and is provided.

The magnet 5 has a disk shape with a diameter substantially the same as the flange portion 3 of the iron core 1, and both surfaces constitute magnetic pole faces of an N pole and an S pole, respectively.

The first yoke piece 6 consists of a vertical piece 6a and a bent piece 6b extending above the vertical piece 6a,
The length of the vertical piece 6a in the lateral direction is approximately the same as the length of the insertion hole 4c of the fixing member 4, and a hole 6c for passing the iron core 1 is bored in the center thereof.

Further, the second yoke piece 7 includes a vertical piece 7a,
It consists of a horizontal piece 7b whose length is approximately the same as that of the bobbin 2, and the horizontal length of the vertical piece 7a is the same as that of the fixing member 4.
The length of the engagement groove 4d is equal to the length of the engagement groove 4d, and a long hole-shaped window hole 7c is provided on the vertical side of the horizontal piece 7b, and small window holes 7b and 7e are provided on both sides of the horizontal piece 7b near the tip. Furthermore, a recess 7f for supporting the movable armature is provided at the tip of the horizontal piece 7b.

The movable armature 8 consists of a horizontal piece 8c, which has a pusher 8b made of an insulating material fixed to the upper surface of its tip, and a vertical piece 8d. A projecting piece 8e is provided which is engaged and supported in the recess 7f of the horizontal piece 7b of the second yoke piece 7.

The electromagnetic block A is constructed by assembling the above-mentioned iron core 1, non-magnetic material 1b, bobbin 2, magnet 5, first yoke piece 6, second yoke piece 7, and movable armature 8. Ru. Assembly is performed centering on the bobbin 2, and begins by inserting the vertical piece 6a of the first yoke piece 6 into the insertion hole 4c of the fixing member 4 fixed to one end of the bobbin 2. At this initial stage, the hole 6c of the vertical piece 6a matches the hollow hole of the bobbin 2 and the insertion hole 4a of the fixing member 4, but the first yoke piece 6 is not fixed. on the other hand,
One magnetic pole face (N pole face) of the magnet 5 is magnetically attached to the surface of the flange 1a of the iron core 1, and the insertion holes 4a and the holes 6c are inserted from the non-magnetic material 1b attached to the tip of the iron core 1. If you pass the whole thing through the hollow hole of bobbin 2,
At the same time as the magnet 5 is stored in the storage portion 4b, the yoke piece 6 is attracted and fixed to the iron core 1 by its magnetic force. That is, in this state, the magnet 5 and the iron core 1, and the iron core 1 and the first yoke 6 are magnetically attached to each other, so that the horizontal movement of the yoke 6 is restricted by the insertion hole 4c. This prevents iron core 1 from coming out,
Furthermore, the yoke piece 6 is also fixed. In other words, each of these elements is temporarily fixed at a fixed position by the magnet 5.

After temporarily fixing the iron core 1 and the first yoke piece 6 as described above, the vertical piece 7a of the second yoke piece 7 is then fixed.
is engaged with the engagement groove 4d. Then, the bent piece 6b of the first yoke piece 6 is connected to the window hole 7c of the second yoke piece 7.
is inserted so that its tip faces the bobbin 2, the upper surface of the horizontal piece 7b of the second yoke piece 7, and the vertical piece 7a and the other magnetic pole face (S pole face) of the magnet 5.
is magnetically attached, and the above-mentioned temporary fixing becomes completely fixed. Note that the horizontal length of the vertical piece 7a is the groove 4d.
Since the length of the groove 4d is equal to the length of the second yoke 7, the second yoke 7 is engaged and fixed to the fixing member 4, whereas the iron core 1 and the first yoke 6 are not completely fixed. This is achieved by the vertical piece 7a of the second yoke piece 7 fixed as described above completely blocking the movement of the iron core 1 in the horizontal direction. Therefore, in order to achieve a completely fixed state, the other magnetic pole face (S pole face) of the magnet 5 when the iron core 1 etc. is temporarily fixed.
Needless to say, there must be no gap between the vertical piece 7a and the inner surface (magnetized surface) of the vertical piece 7a.

In the state where the above assembly is completed, the first yoke piece 6 and the second yoke piece 7 are magnetized by the magnet 5. When the horizontal piece 8c is engaged with the recess 7f of the first yoke piece 7 and supported on the horizontal piece 7b, the tip of the horizontal piece 8c is attracted to the tip of the first yoke piece 6, and the support is maintained in a stable state. Ru. In this case, the tip of the iron core 1 is also magnetized, but since the non-magnetic material 1b is attached to this tip, the magnet 5
The second yoke piece 7 and the movable armature 8 with the magnetomotive force source
The resistance of the magnetic circuit consisting of the vertical piece 8d and the iron core 1 increases, and the attraction force generated on the vertical piece 8d cannot be greater than the attraction force generated at the tip of the horizontal piece 8c. The non-magnetic material attached to the tip of the iron core 1 is not attracted. To explain the configuration in more detail, the movable armature 8 has a letter-like shape, but its bending angle is slightly larger than 90 degrees, and the length of the horizontal piece 8c is such that the protruding piece 8e is in the recessed part. Pusher 8b is engaged with 7f.
is made long enough to reach the window hole 7c, and the vertical piece 8d is
The length of is the same and its inner surface is made of non-magnetic material 1b.
The length is opposite to the surface of the For this reason,
As mentioned above, the second yoke piece 7 and the horizontal piece 8c of the movable armature 8 are stronger than the magnetic circuit in which the second yoke piece 7, the vertical piece 8d of the movable armature 8, and the iron core 1 form a magnetic path. , and the first yoke piece 6 as a magnetic path, the magnetic resistance can be reduced at least because there is no intervening non-magnetic material. The part is the first yoke piece 6
It will stick to the tip and be stably supported.
In other words, when the coil is not energized,
The tip of the horizontal piece 8c of the movable armature is attracted to the tip of the first yoke piece 6.

The electromagnetic block A is assembled as described above. In addition to this electromagnetic block A, a contact block and a case are required to construct a small relay.

An outline of this contact block and case will be explained with reference to FIG. The contact terminals 13, 14 and the normally open contact terminals 15, 16 are integrally molded and fixed to the insulating stands 17, 18, and the contact part 1 has a step at the top.
3a, 15a and 14a, 16a, one end of which is fixed to the upper end of the coil terminals 9, 11 and 10, 12, and which is elastically biased downward. 19a, 20
a, its contact portions 13a, 15a and 14a,
It is formed interposed in the stepped portion of 16a. The contact blocks B and C are arranged and assembled on both sides of the electromagnetic block A, and after assembly, the upper surface of the pusher 8b of the movable armature 8 becomes the lower surface of the movable contact pieces 19 and 20 of each contact block. It is placed in a position opposite to the In this embodiment, grooves 17a, 18a are horizontally provided in the upper end of the inner surface of each block in the longitudinal direction, as shown in the figure, and grooves 17a, 18a are provided laterally in the longitudinal direction.
There is a protrusion 17b on the lower surface side at the upper part of approximately the center of 18a.
Tongue pieces 17c, 18c having 18b are provided protrudingly, and one horizontal edge of the second yoke piece 7 is aligned with the grooves 17a, 1.
8a, and with both ends of the insulating stands 17, 18 in contact with the collar 3 of the bobbin 2 and the fixing member 4, the tongue pieces 17c, 18
Since the contact blocks B and C are assembled by fitting and engaging the protrusions 17b and 18b of the second yoke 7 into the small window holes 7d and 7e of the second yoke piece 7, it is easy to attach the contact blocks B and C to the electromagnetic block A. It also eliminates the need for screws, etc.

The case is composed of a container-shaped base 21 and a lid 22, and the lid 22 is engaged after the electromagnetic block A and contact blocks B and C are housed in the base 21. In this case as well, since the engagement is performed by the recesses 22a and 22b provided on the lid 22 and the protrusions 21a and 21b provided on the base 21, there is no need to separately prepare an engagement means. .

Next, referring to FIG. 2, the operation of the small relay according to this embodiment will be explained.

As mentioned above, under normal conditions, the above-mentioned The tip of the horizontal piece 8c is the first yoke piece 6
It is adsorbed to the tip of the. Considering the magnetization polarity of the main parts in this normal state, when the magnet 5 has the polarity shown in the figure, the tip of the first yoke 6 is the N pole, and the tip of the horizontal piece 7b of the second yoke 7 is The tip is the S pole, and the tip of the iron core 1 is the N pole, and the horizontal piece 8 of the movable armature 8
The tip of the vertical piece 8d is magnetized to the S pole, and the tip of the vertical piece 8d is magnetized to the S pole.

Now, if the coil is energized in this state and the direction of the magnetic flux generated in the iron core 1 is made the same as the direction of the magnetic flux of the magnet 5, the tip of the bent piece 6b of the first yoke piece 6 will be
The large magnetic force generated within the iron core 1 changes it to the south pole. On the other hand, the magnetization state of the movable armature 8 is such that the tip of the horizontal piece 8c is the S pole and the vertical piece 8d is the S pole.
Since the tip is also located at the S pole, a repulsive force acts on the tip of the horizontal piece 8c, and a large suction force acts on the vertical piece 8d. As a result, the movable armature 8 rotates in the direction of arrow P around its supported bent portion, and the vertical piece 8d is attracted to the surface of the non-magnetic material 1b, causing the pusher 8b to rotate as a movable armature. 19 and 20 upward against its elastic force. Therefore, the movable contact pieces 19, 20 are separated from the contact portions 13a, 14a,
Instead, it comes into contact with the contact portions 15a and 16a. The contact portion is switched in this way, but when the current to the coil is stopped, the magnet 5 is again placed at the tip of the horizontal piece 8c of the movable armature 8.
The suction force is applied, and the movable contact pieces 19, 20
Due to the elastic action of , the armature 8 rotates in the direction opposite to the arrow P and returns to its original state.

That is, when the coil is energized, the contact portions 15a,
16a closes and stops energizing, the contact portion 13
The operation of closing a and 14a is performed.

As is clear from the above explanation of the operation, normally the contacts 13a and 14a are held closed by the action of the magnet 5, but when the coil is energized, the magnetic force of the electromagnet Furthermore, contact switching is performed by the magnetic force added to the magnetic force of the magnet 5. Therefore, it is not necessary to bear all the force necessary for switching the contacts by the current flowing through the coil 1, and the ampere turns can be reduced by the magnetic force of the magnet 5. Therefore, the wire diameter of the coil or current flow can be made smaller than when the magnet 5 is not used, and as a result, it is possible to design a relay with high sensitivity characteristics without increasing the overall size. .

In the above embodiment, the nonmagnetic material 1b is attached to the tip of the iron core 1, but it may be attached to the inner surface of the vertical piece 8d of the movable armature 8. Furthermore, the magnetic pole face of the magnet 5 may be reversed from the arrangement shown in FIG. 2, and in that case, by reversing the direction of the current flowing to the coil, exactly the same operation as above can be performed. .

As described above, according to the present invention, a highly sensitive compact relay can be obtained by using only one small magnet. In addition, by removing the non-magnetic material, the magnetic resistance of that part can be significantly reduced, creating a so-called self-holding relay that maintains its attraction even when the current is turned off. This has the advantage of being of practical value in terms of application, in that the way the relay is used can be changed as needed.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a small relay according to an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of a main part of the relay. DESCRIPTION OF SYMBOLS 1... Iron core, 1a... Flam part, 1b... Non-magnetic material, 2... Bobbin, 5... Magnet, 6... First yoke piece, 7... Second yoke piece, 7c... Window Hole, 8...
...Movable armature, 19,20...Movable armature.

Claims (1)

[Claims] 1. A bobbin around which a coil is wound, an iron core having a flange formed at one end and inserted into the bobbin, a magnet with one magnetic pole surface magnetically attached to the flange, and a magnet that engages with the flange of the iron core and has a tip end. has a first yoke piece facing the top of the bobbin, a vertical piece magnetically attached to the other magnetic pole surface of the magnet, and a window hole through which the first yoke piece is inserted, and the length is approximately the same as the bobbin. a second yoke consisting of the same horizontal piece, a bent portion supported at the tip of the second yoke, one end facing the other end of the iron core, and the other end facing the tip of the first yoke. It has a movable armature that faces the movable armature, and a movable contact piece that opens and closes a contact according to the rotational movement of the movable armature, and the movable armature rotates in response to when the coil is energized and when it is not energized. A small relay characterized in that a non-magnetic material is interposed between the movable armature and the other end of the iron core, or a portion facing the tip of the first yoke so that the position can be specified.