JP5562055B2 - AC electromagnetic relay - Google Patents

Description

  The present invention includes a coil bobbin around which a coil is wound, an iron core inserted into an insertion hole of the coil bobbin, an armature that is arranged to face the magnetic pole surface of the iron core and is attracted to the magnetic pole surface based on electromagnetic action, It is related with the electromagnetic relay for alternating current provided with.

  In the AC electromagnetic relay, a winding coil is fixed to the iron core head to generate magnetic fluxes having different phases. Thereby, the AC electromagnetic relay operates without rectifying the coil applied voltage. A conventional example of this type of AC electromagnetic relay is disclosed in Patent Document 1. In the first line to the twelfth line of paragraph number 0008 of Patent Document 1, a description explaining the configuration of the AC electromagnetic relay, that is, “in the AC electromagnetic relay, the longitudinal section of the main part is shown. As shown in Fig. 5 (a) and Fig. 5 (b) showing a perspective view of the main part, it is necessary to attach a copper ring-shaped bear coil 21 to the tip of the iron core 27. This bear coil 21 is a magnetic flux. Therefore, the AC iron core 27 is a cylindrical body having the same diameter that can be inserted into the insertion hole 4a of the coil bobbin 4, and a mounting groove 27a in the short direction is formed at the tip of the cylindrical body. It has a shape recessed along the longitudinal direction from the contact surface 27b at the front end, and the bear coil 21 is inserted into the front end portion of the iron core 27 protruding from the insertion hole 4a by fitting means to the mounting groove 27a. There is.

Japanese Patent Laid-Open No. 08-250004

  However, in the AC electromagnetic relay, a mounting groove for fixing the coiling coil is formed on the magnetic pole surface of the iron core head, so that there is a problem that the magnetic pole area becomes smaller than that of the DC electromagnetic relay. . Further, there is a problem that the winding space is narrowed by the amount of the winding coil fixed to the iron core head, and the number of windings is reduced. If the area of the magnetic pole is reduced or the number of windings is reduced, the magnetic attractive force decreases, and the spring force of the spring that urges the armature away from the magnetic pole surface of the iron core and the magnetism of the iron core that receives electromagnetic action There is a concern that the matching with the attractive force is lost and the magnetic relay does not function as an AC electromagnetic relay. In order to increase the magnetic attractive force, it is necessary to increase the power consumption applied to the AC electromagnetic relay.

  The present invention provides an AC electromagnetic relay capable of increasing and stabilizing a magnetic attractive force.

In order to achieve the above object, an AC electromagnetic relay according to claim 1 generates a magnetic flux having a phase different from that of a coil bobbin around which a coil is wound and an iron core inserted into an insertion hole of the coil bobbin. An annular scraping coil fixed to a mounting groove formed at the tip of the iron core, and an armature disposed opposite to the magnetic pole surface of the iron core and attracted to the magnetic pole surface based on electromagnetic action In the AC electromagnetic relay, the iron core includes a body portion that is a portion inserted into the insertion hole of the coil bobbin, and a head portion that is exposed outside the insertion hole of the coil bobbin and to which the scraping coil is fixed. The coil bobbin has a tip wall from which the head of the iron core protrudes, and the tip wall has a shape corresponding to the outer shape of the scraping coil. And said cocoon Ri recess for receiving the coil is formed.

  According to a second aspect of the present invention, in the AC electromagnetic relay according to the first aspect, the iron core has a stepped columnar shape, and the outer diameter of the head is larger than the outer diameter of the trunk. .

  According to a third aspect of the present invention, in the AC electromagnetic relay according to the first or second aspect, a depth dimension of the mounting groove is formed larger than a height dimension of the head portion of the iron core.

  A fourth aspect of the present invention is the AC electromagnetic relay according to any one of the first to third aspects, wherein a depth dimension of the mounting groove is smaller than a height dimension of the head portion of the iron core. Formed.

  According to the AC electromagnetic relay according to the present invention, the area of the iron core magnetic pole surface can be increased while securing the winding space of the coil, so that the magnetic attractive force can be increased and stabilized.

It is a disassembled perspective view which shows one Embodiment of the electromagnetic relay for alternating currents of this invention. FIG. 2 is an assembly diagram of the AC electromagnetic relay shown in FIG. 1. It is sectional drawing which shows the iron core inserted in the coil bobbin. It is a perspective view which shows the state which the iron core and the coiling coil isolate | separated. It is a perspective view which shows the state in which the iron core was inserted in the coil bobbin. It is a figure which shows the graph which compared the magnetic attraction force of the iron core with a large magnetic pole area, and the iron core with a small magnetic pole area. It is a figure which shows the modification of an iron core. It is sectional drawing which shows the state by which the iron core shown in FIG. 7 was inserted in the coil bobbin. It is a figure which shows the other modification of an iron core. FIG. 10 is a cross-sectional view illustrating a state where the iron core illustrated in FIG. 9 is inserted into a coil bobbin.

Hereinafter, an embodiment of an AC electromagnetic relay of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the AC electromagnetic relay 1 is disposed so as to face the base block 30, the electromagnet block 2 fixed to the base block 30, and the magnetic pole surface 9 a of the iron core 9 of the electromagnet block 2. The armature 18 that is attracted to the magnetic pole surface 9a based on the electromagnetic action, the pair of spring pieces 31 and 32 that are arranged on the other end side of the electromagnet block 2 and constitutes a normally open contact, and one end connected to the armature 18 The other end is connected to one movable spring piece 31 and moves in a straight line in the longitudinal direction of the electromagnet block 2 in conjunction with the armature 18 to open and close the contacts 31a and 32a of the pair of spring pieces 31 and 32. 35.

  The base block 30 includes a flat base 36 and a housing 37 that houses an electromagnet, and is integrally injection-molded with an electrically insulating resin material. The housing 37 is formed integrally with the base 36 leaving a space behind the base 36, and has a peripheral wall 37a that defines an accommodation space for accommodating the electromagnet block 2, and an opening 37b that communicates with the accommodation space on the front side. ing. On the back side of the housing space, there is a wall portion that separates the pair of spring pieces 31 and 32 from the electromagnet block 2 housed in the housing space. On the inner surface of the peripheral wall 37a, there are provided a plurality of locking portions (not shown) for locking the electromagnet block 2 inserted from the opening 37b so as not to come out. In the space behind the base 36, through grooves 36a and 36b that penetrate in the thickness direction at predetermined positions are formed, and tabs formed at the lower ends of the pair of spring pieces 31 and 32 in the through grooves 36a and 36b. Shaped terminals 33 and 34 are press-fitted so that the tip portions protrude from the back surface of the base 36, and the pair of spring pieces 31 and 32 are fixed in a state where they stand upright with respect to the plate surface of the base 36 (FIG. 2). reference).

  The pair of spring pieces 31 and 32 are leaf springs punched out into a predetermined shape from a conductive substrate such as phosphor bronze for a spring by pressing, and one spring piece 31 is a movable side spring piece having a movable contact 31a. The other spring piece 32 is a fixed side spring piece having a fixed contact 32a. The pair of spring pieces 31 and 32 are arranged opposite to each other in the space behind the base block 30 on the opposite side of the armature 18 via a predetermined gap so that the movable contact 31a and the fixed contact 32a are in electrical contact. (See FIG. 2). That is, the pair of spring pieces 31 and 32 constitutes a normally open contact, and the movable contact 31a and the fixed contact 32a are closed by pressing the movable spring piece 31 against the card 35 moving in conjunction with the armature 18. To do. The card 35 and the movable spring piece 31 are coupled by the pair of claws 38 of the card 35 engaging with the hole 39 of the spring piece 31 (see FIG. 2).

  The armature 18 is made of, for example, magnetic steel, and is opposed to the magnetic pole surface 9a of the iron core 9 at a constant interval. The armature 18 has a protrusion 18 a that protrudes substantially at the center of the plate surface and engages with a hole 17 b formed in the vertical portion 17 a of the support spring 16, so that the vertical portion 17 a of the L-shaped support spring 16 It is held together. The tip 18 b of the armature 18 engages with the hole 41 of the card 35. The card 35 has an opening 42 and can slide without interfering with the coil 3.

  The horizontal portion 17 c of the support spring 16 is fixed to the lower side of the yoke 12. The vertical portion 17a of the support spring 16 is elastically displaceable in a direction in which the vertical portion 17a and the horizontal portion 17c intersect with each other with respect to the magnetic pole surface 9a of the iron core 9 with a fulcrum as a fulcrum. For this reason, when the iron core 9 is magnetized, the armature 18 is attracted by the magnetic force, the support spring 16 is elastically displaced, and the armature 18 is attracted to the magnetic pole surface 9 a of the iron core 9. When the iron core 9 is demagnetized, the armature 18 is separated from the magnetic pole surface 9a together with the vertical portion 17a of the support spring 16 by the elastic restoring force of the support spring 16, and the support spring 16 is elastically returned to the original position. That is, the intersecting portion of the vertical portion 17a and the horizontal portion 17c of the L-shaped support spring 16 functions as a portion corresponding to a hinge, and the armature 18 is moved from the magnetic pole surface 9a of the iron core 9 by its own spring action. Elastic force can be applied in the direction of leaving. The armature 18 is supported by such a support spring 16 so that it can swing back and forth with a portion corresponding to the hinge of the support spring 16 as a fulcrum. In this embodiment, the plate-like armature 18 is held by the vertical portion 17a of the L-shaped support spring 16, but the armature is L-shaped and one end of the armature is connected to the armature. It can also be elastically supported by a coil spring, and the form of the armature is not limited to this embodiment.

  As shown in FIGS. 3 and 4, the electromagnet block 2 includes a coil bobbin 6 having an insulating property, an iron core 9 having a magnetic pole surface 9 a at the tip thereof inserted into the insertion hole 6 a of the coil bobbin 6, and multiplexed around the iron core 9. A coil 3 wound around the core 9, a yoke 12 magnetically coupled to the base end of the iron core 9, and a mounting groove 9b formed on the magnetic pole surface 9a at the tip of the iron core 9 in order to generate magnetic fluxes having different phases. And a coil terminal 4 (see FIGS. 1 and 2) having one end connected to the coil 3 and the other end connected to an external power source (not shown).

  The coil bobbin 6 is assembled together with the base block 30. The coil bobbin 6 includes a cylindrical portion 7 around which the exciting coil 3 is wound, an insertion hole 6a into which the iron core 9 is inserted, and a cylindrical portion 7 at the proximal end and the distal end of the cylindrical portion 7 respectively. A flange-like base end wall 7a and a distal end wall 7b that are provided around the periphery and restrict the winding space of the coil 3, and a pair of guide walls that are provided following the distal end wall 7b and guide the swing of the armature 18 8a and 8b. The distance between the pair of guide walls 8a and 8b facing each other is slightly larger than the width of the armature 18 (FIG. 4).

  The yoke 12 increases the magnetic flux density, and is fixed to the coil bobbin 6 by caulking, for example. The yoke 12 is an L-shaped member made of, for example, magnetic steel, and the vertically standing wall portion 13a is disposed to face the proximal end wall 7a on the rear side of the coil bobbin 6, and the horizontal wall portion 13b. Is arranged in parallel with the iron core 9 below the coil bobbin 6. A hole 14 a (see FIG. 1) formed in the vertical wall 13 a of the yoke 12 engages with the tip of the iron core 9. The front end of the horizontal wall portion 13 b of the yoke 12 extends to the vicinity of the front end of the iron core 9. That is, the entire length of the yoke 12 is formed to be approximately the same as or longer than the iron core 9, and the magnetic flux of the magnetized iron core 9 is prevented from leaking to the outside, thereby increasing the magnetic flux density. ing. The front end portion of the horizontal wall portion 13b of the yoke 12 is disposed to face the end portion of the support spring 16 (see FIG. 1) that supports the armature 18.

  The iron core 9 is made of, for example, magnetic steel, has a cylindrical shape, and is fixedly received in the cylindrical portion 7 of the coil bobbin 6. The iron core 9 has a head portion 10 exposed from the end portion of the coil bobbin 6, and a magnetic pole surface 9 a is formed on the front end surface of the head portion 10. The magnetic pole surface 9a is attracted and attracted by the electromagnetic force with the armature 18 disposed opposite to the magnetic pole surface 9a. FIG. 5 shows a state in which the magnetic pole surface 9a of the iron core 9 and the armature 18 are arranged to face each other. The coil 3 is tightly wound with a required length portion of a conductor wire on the outer surface of the cylindrical portion 30 between the base end wall 7 a and the tip wall 7 b of the coil bobbin 6.

  The shape of the iron core 9 is not limited to the shape of the present embodiment, but can be a stepped columnar shape. Other shapes may be a stepped prism shape or a stepped saddle shape. The head part 10 and the body part 11 of the iron core 9 do not have to have the same shape. The body part 11 has a columnar shape and the head part 10 has a prism shape, or conversely, the body part 11 has a prism shape. 10 may be a cylindrical shape. When the trunk portion 11 has a cylindrical shape and the head portion 10 has a prismatic shape, the magnetic pole area of the iron core 9 can be relatively increased, the trunk portion 11 has a prismatic shape, and the head portion 10 has a cylindrical shape. In this case, the magnetic flux of the iron core 9 can be relatively increased. In order to form the head portion 10 of the iron core 9 to be thicker than the body portion 11, it is possible to use header processing that is crushed while hitting the head portion 10. As another method, the head portion 10 can be formed by bending the iron core 9 at a substantially right angle at the tip end side. The body portion 11 is formed to have a dimension that can secure a winding space of the coil 3 and maintain a desired magnetic flux density, and the head portion 10 can have a large magnetic pole area as much as possible in design. Formed. It is preferable that the height of the head 10 is approximately the same as or larger than the width of the scraping coil. Here, the magnetic pole area of the head 10 means a flat area formed on the end face of the head 10 and attracted to the armature 18.

  FIG. 6 shows a graph comparing the magnetic attractive force between the iron core 9 having a large magnetic pole area and the iron core 9 having a small magnetic pole area. The vertical axis of the graph shows force (spring force or magnetic attraction force), and the horizontal axis of the graph shows the distance d between the magnetic pole surface 9a of the iron core and the armature 18. The spring force is weakened as the armature 18 is separated from the magnetic pole surface 9 a of the iron core 9. In the iron core 9 having a small magnetic pole area, the magnetic attractive force is weaker than the spring force on the side where the armature 18 is separated from the magnetic pole surface 9a of the iron core 9. This means that the armature 18 is not attracted to the magnetic pole surface 9 a of the iron core 9 even when a current is passed through the coil 3 to excite the iron core 9. In the iron core 9 having a large magnetic pole area, the magnetic attractive force does not become weaker than the spring force. Therefore, the armature 18 is attracted to the magnetic pole surface 9a of the iron core 9 by electromagnetic action, and functions as the AC electromagnetic relay 1. . In the AC electromagnetic relay 1, in order to fix the scraping coil 15 to the iron core 9, the mounting groove 9 b that engages with the hole 15 a of the scraping coil 15 is formed in the iron core 9. By making the head portion 10 of the head 9 thicker than the body portion 11, the decrease in the magnetic pole area can be compensated for, and the magnetic attractive force can be increased to stably operate the AC electromagnetic relay 1. .

  As shown in FIG. 3 and the like, the coiling coil 15 is a so-called copper ring, and is fixed by caulking by engaging a hole 15a with a mounting groove 9b formed in the magnetic pole surface 9a at the tip of the iron core 9. The coiling coil 15 creates magnetic fluxes having different phases and prevents the magnetic attractive force that periodically changes with time from becoming smaller than the spring force of the relay spring that urges the armature 18. That is, the armature 18 is prevented from attaching or leaving the magnetic pole surface 9a of the iron core 9. Thereby, operation | movement of the electromagnetic relay 1 with an alternating current power supply is guaranteed. In the DC electromagnetic relay, the coiling coil 15 is unnecessary because a constant magnetic attractive force can be obtained by the DC power source.

Next, the operation of the AC electromagnetic relay 1 will be described.
First, when the coil 3 is energized, a magnetic attractive force is generated between the magnetic pole surface 9a of the iron core 9 and the armature 18 due to electromagnetic action, and the armature 18 swings and contacts with the magnetic pole surface 9a of the iron core 9. The armature 18 contacts. By swinging the armature 18, the card 35 also moves in conjunction with it, the movable spring piece 31 is pushed by the card 35 and moves toward the fixed spring piece 32, and the contact between the pair of spring pieces 31, 32. 31a and 32a contact | abut. When the coil 3 is de-energized, the armature 18 is returned to the initial position by the spring force of the support spring 16, whereby the card 35 is also returned to the original position, and the contacts of the pair of spring pieces 31, 32. 31a and 32a are separated.

  Next, FIGS. 7 to 10 show modified examples of the iron core 9 used in the AC electromagnetic relay 1. 7 shows a form in which the mounting groove 21b is formed deeper than the boundary between the head portion 22 and the body portion 23, and FIG. 9 shows that the mounting groove 24b is formed shallower than the boundary between the head portion 25 and the body portion 26. The form being shown is shown. That is, in FIG. 7, the depth dimension of the mounting groove 21b is formed larger than the height dimension of the head 22 and in FIG. 9, the depth dimension of the mounting groove 24b is formed smaller than the height dimension of the head 25. 8 and 10 show a state where the iron cores 21 and 24 are inserted into the coil bobbins 6, respectively. Unlike the DC electromagnetic relay, the AC electromagnetic relay 1 needs to fix a scraping coil to the iron core. The mounting grooves 21b and 24b necessary for fixing the scraping coil 15 to the iron cores 21 and 24 are formed by machining, and after cutting and burrs are removed cleanly, the scraping coil 15 is fixed. . This is because if chips or burrs remain in the vicinity of the mounting grooves 21b and 24b, the magnetic attractive force may be reduced due to interference between the chips and the magnetic force lines. In the present invention, since steps are formed between the head portions 22 and 25 of the iron cores 21 and 24 and the body portions 23 and 26, it is difficult to remove chips and burrs. , 24b is made shallower or deeper than the boundary between the heads 22 and 25 and the body parts 23 and 26, so that chips and burrs can be easily removed, and the thick iron cores 21 and 24 of the heads 22 and 25 can be removed. Processing becomes easy.

  As mentioned above, although one Embodiment of the electromagnetic relay for alternating current was described, this invention is not restrict | limited to disclosed embodiment, The change and improvement of embodiment are accept | permitted.

1 AC electromagnetic relay 2 Electromagnetic block 3 Coil 6 Coil bobbin 9, 21, 24 Iron core 10, 22, 25 Head 9b, 21b, 24b Mounting groove 15 Stripping coil 18 Armature 30 Base block 36 Base 37 Housing

Claims (4)

A coil bobbin around which a coil is wound, an iron core inserted into an insertion hole of the coil bobbin, and an annular scraping coil fixed to a mounting groove formed at the tip of the iron core to generate magnetic fluxes having different phases In an AC electromagnetic relay provided with an armature disposed opposite to the magnetic pole surface of the iron core and attracted to the magnetic pole surface based on electromagnetic action,
The iron core has a body portion which is a portion inserted into the insertion hole of the coil bobbin, and a head portion which is exposed to the outside of the insertion hole of the coil bobbin and to which the scraping coil is fixed. Formed thicker than the trunk ,
The coil bobbin has a tip wall from which the head of the iron core protrudes, and a recess is formed on the tip wall to have a shape corresponding to the outer shape of the scraping coil and receive the scraping coil. Electromagnetic relay for AC. The core forms the stepped cylindrical, the outer diameter of the head is formed larger than the outer diameter of the body portion, the electromagnetic relay AC according to claim 1. The depth of the mounting groove is formed larger than the height of the head of the iron core, the electromagnetic relay AC according to claim 1 or 2. The depth of the mounting groove is formed smaller than the height of the head of the iron core, the electromagnetic relay AC according to claim 1 or 2.

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