JP2010086971A - Contact arrangement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contact arrangement for improving magnetic efficiency of an electromagnetic device. <P>SOLUTION: A shaft 14a of a coil bobbin 14 is structured of a large-diameter part 14b facing to an erection piece 15b in a peripheral direction, and a small-diameter part 14c facing to a movable iron core 8 and a fixed iron core 7 in the peripheral direction and having a smaller outer diameter than the large-diameter part 14b. Since the outer diameter of the shaft 14a is smaller than the conventional example in the small-diameter part 14c, a space for winding a coil 13 is increased so as to improve magnetic efficiency of the electromagnetic device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a contact device suitable for a power load relay, an electromagnetic switch or the like.

  FIG. 4 is a side sectional view showing a sealed contact device which is an example of a conventional contact device (see, for example, Patent Document 1). The sealed contact device includes a sealed contact portion A and a drive unit B.

  First, the sealing contact portion A will be described. A box-shaped sealed container 1 whose one surface is opened is formed of a heat-resistant material such as ceramic, and through holes 1a are provided at two locations at the bottom. The fixed terminals 2 and 2 partially inserted into the through holes 1a and 1a are formed in a substantially multi-stage bottomed cylindrical shape by, for example, a copper-based material, and the fixed contact 2a is fixed to one end portion on the bottom side. The flange 2b is provided at the other end on the opening side. The fixed terminal 2 is hermetically joined to the sealing container 1 by brazing or the like in the vicinity of the flange 2b with the other end protruding from the sealing container 1. Furthermore, a thread groove (not shown) is formed inward from the opening side of the fixed terminal 2.

  The movable contact 3 is formed, for example, in a flat plate shape by using a copper-based material or the like, and the movable contact 3a is fixed to both ends with a distance to and away from the fixed contact 2a. An insertion hole 3b is provided in the central portion of the movable contact 3, and one end 4a of the movable shaft 4 formed in an approximately round bar shape by an insulating material is inserted into the insertion hole 3b and caulked, whereby the movable shaft 4 is squeezed. A movable contact 3 is coupled. The movable contact 3 is elastically biased in a direction (upward in the drawing) in which the movable contact 3a contacts the fixed contact 2a by a contact pressure spring 6 described later. A male screw 4 c is cut at the other end 4 b of the movable shaft 4.

  The fixed iron core 7 is formed in a substantially cylindrical shape with a thin end portion 7a, and an insertion hole 7b through which the movable shaft 4 is inserted is provided in the axial direction. The fixed iron core 7 is inserted into an insertion hole 11a of a fixing plate 11 to be described later, and one end 7a is fixed, and a recess 7c having an inner diameter larger than the inner diameter of the insertion hole 7b is provided at the other end. . The movable iron core 8 formed in a substantially cylindrical shape is provided with an insertion hole 8a through which the movable shaft 4 is inserted in the axial direction. A female screw (not shown) for screwing the male screw 4c of the movable shaft 4 into the insertion hole 8a so that the connecting position of the movable shaft 4 and the movable iron core 8 is variable along the axial direction of the movable shaft 4. Is cut off. The movable iron core 8 has a face 8b facing the fixed iron core 7 at one end in the axial direction, and a recess 8c having an inner diameter larger than the inner diameter of the female screw at the other end. The movable iron core 8 is a sliding surface whose outer surface slides on the inner peripheral surface of the cap 10 described later.

  The return spring 9 elastically biases the movable iron core 8 in the opening direction of the fixed contact 2a and the movable contact 3a, and is a compression coil spring having an inner diameter slightly larger than the inner diameter of the insertion hole 7b of the fixed iron core 7. And is externally inserted into the movable shaft 4 inserted through the insertion hole 7 b of the fixed iron core 7, and one end thereof is fitted into the recess 7 c of the fixed iron core 7 and the position is regulated. The cap 10 is formed of a nonmagnetic material in a bottomed cylindrical shape, and houses the movable iron core 8 on the bottom side, and houses the fixed iron core 7 facing the facing surface 8b of the movable iron core 8 on the opening side.

  The fixed plate 11 is formed in a rectangular shape from a magnetic metal material such as iron and is connected to a yoke 15 described later to form a magnetic circuit together with the fixed iron core 7 and the movable iron core 8. As described above, the fixing plate 11 is provided with the insertion hole 11a through which the one end 7a of the fixed iron core 7 is fixed, and the vicinity of the insertion hole 11a is hermetically joined to the cap 10. The joining member 12 is formed in a cylindrical shape with opening holes 12a at both ends by a metal material so that the inner peripheral edge of the opening hole 12a on one end side is located inside the inner surface of the sealing container 1. It has become. The joining member 12 is hermetically joined to the opening end of the sealing container 1 on one end side and hermetically joined to the fixed plate 11 on the other end side. Further, the joining member 12 is bent along the entire circumference of the cylindrical portion, and the opening cross section of the opening hole 12a is formed larger on the other end side than on the one end side. And this joining member 12 forms the airtight space for accommodating the stationary contact 2a and the movable contact 3a, the stationary iron core 7, and the movable iron core 8 by airtightly joining to the sealing container 1 and the stationary plate 11 mentioned above. In this hermetic space, a gas mainly composed of hydrogen is hermetically sealed with, for example, about 2 atm. A contact pressure spring 6 made of a compression coil spring is inserted between the fixed plate 11 and the movable contact 3 while being externally inserted into the movable shaft 4 to elastically bias the movable contact 3. .

  Next, the drive unit B will be described. This drive part B constitutes an electromagnet device together with the fixed iron core 7, the movable iron core 8 and the fixed plate 11. A coil 13 is formed by winding a coil winding around a cylindrical shaft portion 14 a of the coil bobbin 14. The yoke 15 is formed in a U-shape with a central piece and both opposing pieces so as to surround the coil 13, and a through hole 15 a is provided in the central piece, together with the fixed iron core 7, the movable iron core 8, and the fixed plate 11. Make a magnetic circuit. In the state where the yoke 15 is disposed, the body portion of the cap 10 described above is located between the yoke 15 and the movable iron core 8.

  The conventional sealed contact device configured as described above operates as follows. Before the excitation of the coil 13, the movable contact 3a faces the fixed contact 2a with a predetermined distance (contact gap). When the coil 13 is excited, the movable iron core 8 is attracted to the fixed iron core 7 and moved, whereby the movable shaft 4 screwed to the movable iron core 8 and later fixed by an adhesive is driven, and the movable contact 3a is Then, the contact gap is gradually reduced and eventually comes into contact with the fixed contact 2a. Thereafter, the spring load suddenly increases by the amount of the spring load of the contact pressure spring 6, and when the movable shaft 4 is further driven, the movable iron core 8 moves by the amount of overtravel, and the spring load further increases. The total of the contact gap and the overtravel amount is the stroke of the movable iron core 8.

  Further, when the excitation of the coil 13 is cut, the movable contact 3 is returned mainly by the urging force of the return spring 9 and displaced in reverse, the movable contact 3a is separated from the fixed contact 2a, and the movable iron core 8 is moved. Also return by a predetermined distance and return to the original state. Note that the arc generated between the contacts at the time of return is sufficiently stretched in the direction of both ends of the movable contact 3 by the magnetic field of the magnetic means (not shown) and extinguished.

JP-A-11-232986

  By the way, in the above-mentioned conventional example, a cylindrical rising piece 15b rising from the peripheral edge of the through hole 15a provided in the central piece of the yoke 15 into the through hole 15a is provided, and the movable iron core 8 and the yoke 15 are opposed to each other. By increasing the area by the rising piece 15b, the magnetic resistance between the two is reduced, and the magnetic efficiency of the electromagnet device is improved. However, since the rising piece 15b of the yoke 15 is interposed between the shaft portion 14a of the coil bobbin 14 and the movable iron core 8 and the cap 10, useless space between the cap 10 and the shaft portion 14a of the coil bobbin 14 ( Since the dead space (S) (see FIG. 4) is generated, the space for winding the coil winding of the coil bobbin 14 is reduced, and the magnetic efficiency of the electromagnet device is reduced by this reduction.

  This invention is made | formed in view of the said situation, The objective is to provide the contact apparatus which can improve the magnetic efficiency of an electromagnet apparatus.

  In order to achieve the above-described object, the present invention provides a fixed terminal provided with a fixed contact, a movable contact provided with a movable contact that contacts and separates from the fixed contact, and a rod-like movable that is fixed to one end side. A magnetic core between the fixed iron core and the movable iron core, a movable iron core fixed to the other end of the movable shaft, a fixed iron core that is extrapolated to the movable shaft and faces the movable contactor, and the movable iron core. An electromagnet device comprising: an electromagnet device that generates and moves the movable iron core in a direction that contacts the fixed iron core; and a return spring that is interposed between the movable iron core and the fixed iron core and elastically biases the movable iron core in a direction away from the fixed iron core. Is a coiled bobbin into which a movable shaft, a fixed iron core, and a movable iron core are inserted into a cylindrical shaft part, a coil wound around the shaft part of the coil bobbin, a coil and a coil bobbin inside, and a shaft part of the coil bobbin. Through hole communicating with the hole In a contact device having a yoke provided at the center of the bottom surface, and a rising piece rising from the periphery of the through hole in the shaft portion is provided on the yoke, the axial portion of the coil bobbin is opposed to the rising piece in the circumferential direction. And a small-diameter portion facing the movable iron core and the fixed iron core in the circumferential direction and having a smaller outer diameter than the large-diameter portion.

  According to the first aspect of the present invention, the coil bobbin has a large-diameter portion that faces the rising piece in the circumferential direction and a small-diameter portion that faces the movable iron core and the fixed core in the circumferential direction and has a smaller outer diameter than the large-diameter portion. Since the shaft portion is configured, there is no dead space due to the thickness of the rising piece between the fixed iron core and the movable iron core and the shaft portion of the coil bobbin, so the space for winding the coil winding is increased and the electromagnet device There is an effect that the magnetic efficiency can be improved.

It is side surface sectional drawing which shows Embodiment 1 of this invention. It is side surface sectional drawing which shows a reference example. It is side surface sectional drawing which shows the other structure in the same as the above. It is side surface sectional drawing which shows a prior art example.

  Hereinafter, embodiments of the present invention will be described in detail. However, since the basic configuration of the embodiment of the present invention is the same as that of the conventional example, the same components are denoted by the same reference numerals and description thereof is omitted.

(Reference example)
FIG. 2 is a side sectional view showing a reference example. The movable iron core 8 has a large-diameter portion 8d facing the fixed iron core 7 along the moving direction (vertical direction in FIG. 2), and is opposed to the rising piece 15b in a direction orthogonal to the moving direction and is larger than the large-diameter portion 8d. It is comprised by the small diameter part 8e with a small outer diameter. The outer diameter of the large-diameter portion 8d is substantially the same as the outer diameter of the fixed iron core 7, and the facing area between the movable iron core 8 and the fixed iron core 7 is the same as in the conventional example.

  The cap 10 has a large inner diameter portion 10a having an inner diameter slightly larger than the outer diameter of the large diameter portion 8d of the fixed iron core 7 and the movable iron core 8, and an inner diameter slightly larger than the outer diameter of the small diameter portion 8e of the movable iron core 8. In addition, a small inner diameter portion 10b having an outer diameter smaller than that of the large inner diameter portion 10a is connected in the moving direction (axial direction) of the movable iron core 8.

  Thus, since the rising piece 15b of the yoke 15 is arranged around the small inner diameter portion 10b of the cap 10, the dead space S generated between the cap 10 and the shaft portion 14a of the coil bobbin 14 in the conventional example. Thus, the cap 10 and the shaft portion 14a of the coil bobbin 14 can be brought into close contact with each other. As a result, the outer diameter of the shaft portion 14a of the coil bobbin 14 becomes smaller than that of the conventional example, and the space for winding the coil 13 can be increased to improve the magnetic efficiency of the electromagnet device. Further, the shaft portion 14a of the coil bobbin 14 around which the coil 13 is wound has an advantage that the material cost can be reduced because the magnetic efficiency can be increased and the number of turns of the coil 13 can be reduced by reducing the outer diameter as much as possible. . Furthermore, since the movable core 8 is composed of the large-diameter portion 8d and the small-diameter portion 8e, the movable core 8 can be reduced in weight as compared with the conventional example, and as a result, the movable core 8 is generated when it hits the fixed core 7. It is also possible to reduce the operation sound by suppressing vibration (impact). In addition, since the moving speed of the movable iron core 8 is increased by weight reduction, it is possible to shorten the operation time of the sealed contact device.

  By the way, in this reference example, when the coil 13 is not excited (when off), the end surface (the lower surface in FIG. 2) of the large-diameter portion 8d of the movable iron core 8 is the bottom surface (the upper surface in FIG. 2) of the large-diameter portion 10a. The movement range of the movable iron core 8 is regulated by contacting the movable iron core 8. Further, as shown in FIG. 3, when the coil 13 is not excited, the end surface (the lower surface in FIG. 3) of the small diameter portion 8e of the movable iron core 8 is brought into contact with the bottom portion (the bottom surface of the small inner diameter portion 10b) of the cap 10. The movement range of the iron core 8 may be regulated, and the operation of the sealed contact device can be stabilized by regulating the movement range of the movable iron core 8 in this way. However, when the end surface of the large-diameter portion 8d of the movable iron core 8 is in contact with the bottom surface of the large-diameter portion 10a of the cap 10 as described above, the movement range of the movable iron core 8 is restricted by the bottom portion of the cap 10. Compared to the above, there is an advantage that the area of the portion (the bottom surface of the large inner diameter portion 10a) with which the movable iron core 8 abuts at the time of OFF is reduced and the rigidity of the portion is increased, so that the operation noise at the time of OFF can be reduced.

  In this reference example, as an example of the contact device, a sealed contact device including a sealing container that houses and seals a fixed contact and a movable contact has been described as an example. The contact device is not limited to the sealed contact device as described above, and the fixed contact and the movable contact may not be hermetically sealed. This also applies to Embodiment 1 described later.

(Embodiment 1)
FIG. 1 is a side sectional view showing Embodiment 1 of the present invention. The movable iron core 8 and the cap 10 are the same as those in the conventional example. Instead, the large-diameter portion 14b facing the rising piece 15b in the circumferential direction (left and right direction in FIG. 1), and the movable iron core 8 and the fixed iron core in the circumferential direction. A shaft portion 14a of the coil bobbin 14 is constituted by a small-diameter portion 14c opposite to the large-diameter portion 14 and having an outer diameter smaller than that of the large-diameter portion 14b.

  Thus, since the rising piece 15b of the yoke 15 is disposed in the space between the cap 10 and the large diameter portion 14b of the coil bobbin 14, in the conventional example, it is between the cap 10 and the shaft portion 14a of the coil bobbin 14. The generated dead space S is eliminated, and the cap 10 and the shaft portion 14a of the coil bobbin 14 can be brought into close contact with each other. As a result, the outer diameter of the shaft portion 14a of the coil bobbin 14 becomes smaller than that of the conventional example in the small diameter portion 14c, and the space for winding the coil 13 can be increased to improve the magnetic efficiency of the electromagnet device.

7 Fixed iron core 8 Movable iron core 13 Coil 14 Coil bobbin 14a Shaft portion 14b Large diameter portion 14c Small diameter portion 15b Rising piece

Claims (1)

  A fixed terminal provided with a fixed contact, a movable contact provided with a movable contact contacting and separating from the fixed contact, a rod-shaped movable shaft on which the movable contact is fixed on one end side, and a fixed contact on the other end side of the movable shaft The movable iron core, the fixed contact core that is externally attached to the movable shaft and facing the movable iron core, and a magnetic attraction force is generated between the fixed iron core and the movable iron core so that the movable iron core moves in a direction that hits the fixed iron core. And a return spring that is inserted between the movable iron core and the fixed iron core and elastically biases the movable iron core away from the fixed iron core. The electromagnet device has a movable shaft and a fixed shaft in a cylindrical shaft portion. A coil bobbin through which the iron core and the movable iron core are inserted, a coil wound around the shaft portion of the coil bobbin, and a through hole that houses the coil and the coil bobbin inside and communicates with the hole of the shaft portion of the coil bobbin are provided in the center of the bottom surface. With a yoke In the contact device in which the rising piece rising from the peripheral edge of the through hole into the shaft portion is provided on the yoke, the shaft portion of the coil bobbin has a large diameter portion facing the rising piece in the circumferential direction, and a movable core and fixed in the circumferential direction. A contact device comprising a small-diameter portion facing the iron core and having an outer diameter smaller than that of the large-diameter portion.

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