JP4600499B2 - Contact device - Google Patents

Description

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

  Conventionally, a so-called normally-open contact device in which the contact is turned off in an initial state is known, and is disclosed in, for example, Patent Document 1. Hereinafter, a conventional example of this type of contact device will be described with reference to the drawings. In the following description, the vertical direction in FIG. 6A is defined as the vertical direction. In this conventional example, as shown in FIG. 6A, a pair of fixed terminals 11 having a fixed contact 11 a and a movable contact 20 having a movable contact portion 20 b contacting and separating from the fixed contact 11 a are provided in a sealing container 10. The contact block A is accommodated, and the drive block B is configured to drive the movable contact 20 so that the movable contact portion 20b contacts and separates from the fixed contact 11a.

  The sealing container 10 is formed in a box shape whose one surface is opened by a heat-resistant material such as ceramic, and through holes 10a are provided at two places on the upper bottom portion thereof. A part of the fixed terminal 11 formed in a substantially bottomed cylindrical shape with, for example, a copper-based material or the like is inserted into the through holes 10a. A fixed contact 11a is fixed to the lower end portion of the fixed terminal 11, and a flange portion 11b is provided at the upper end portion. The fixed terminal 11 is hermetically joined to the sealing container 10 by brazing or the like in the vicinity of the flange 11b with the upper end portion protruding from the sealing container 10. The fixed terminal 11 is formed with a thread groove 11c from the opening side toward the inside. An insertion hole 12a penetrating through the external terminal 12 for connection to an external electric circuit (not shown) is aligned with the screw groove 11c, and the fixing screw 13 is inserted into the insertion hole 12a and screwed into the screw groove 11c. Thus, the fixed terminal 11 and the external terminal 12 are joined.

  A movable contact 20 is disposed below the fixed terminal 11. The movable contact 20 is formed, for example, in a flat plate shape using a copper-based material or the like, and has an interval that makes contact with and separates from the fixed contact 11a. An insertion hole 20a is provided at the center of the movable contact 20, and the upper end of the movable shaft 21 is inserted through the insertion hole 20a. The movable contact 20 is elastically biased in a direction (upward) in which the movable contact portion 20b contacts the fixed contact 11a by a contact pressure spring 22 described later.

  A fixed iron core 30 is disposed on the upper portion of the movable shaft 21 so as to cover the entire circumference thereof. The fixed iron core 30 is formed in a substantially columnar shape, and an insertion hole 30a through which the movable shaft 21 is inserted is provided along the axial direction at the center of the cross section. The fixed iron core 30 is inserted into an insertion hole 34a of a fixed plate 34, which will be described later, and an upper end portion is fixed, and a lower end portion is disposed so as to face an upper end portion of a movable iron core 31, which will be described later. In addition, a recess 30b having an inner diameter larger than the inner diameter of the insertion hole 30a is provided at the lower end of the fixed iron core 30.

  A movable iron core 31 is disposed below the movable shaft 21 so as to cover the entire circumference. The movable iron core 31 is formed in a substantially columnar shape, and an insertion hole 31a through which the movable shaft 21 is inserted is provided along the axial direction at the approximate center of the cross section. The movable core 31 has an upper end facing the lower end of the fixed core 30, and a recess 31 b having an inner diameter larger than the inner diameter of the insertion hole 31 a is provided at the lower end. Further, the movable iron core 31 is a sliding surface whose outer peripheral surface slides on an inner peripheral surface of a bottomed cylindrical portion 33 described later.

  A return spring 32 is disposed in the recess 30 b of the fixed iron core 30. The return spring 32 elastically biases the movable iron core 31 in a direction in which the movable contact portion 20b is separated from the fixed contact 11a, and is composed of a compression coil spring having an inner diameter slightly smaller than the inner diameter of the recess 30b. The return spring 32 is extrapolated to the movable shaft 21 inserted through the insertion hole 30a of the fixed iron core 30, its lower end is fixed to the upper end of the movable iron core 31, and its upper end is fixed to the upper surface of the recess 30b. The The bottomed cylindrical part 33 is formed in a bottomed cylindrical shape with a nonmagnetic material, and houses the movable iron core 31 on the lower bottom part side, and houses the fixed iron core 30 facing the movable iron core 31 on the opening part side.

  The fixed plate 34 is formed in a substantially rectangular shape by a magnetic metal material such as iron, and is connected to a yoke 42 described later to form a magnetic circuit together with the fixed core 30 and the movable core 31. As described above, the fixing plate 34 is provided with the insertion hole 34a through which the upper end of the fixed iron core 30 is fixed before being fixed, and the vicinity of the insertion hole 34a is hermetically joined to the bottomed cylindrical portion 33. . A contact pressure spring 22 made of a compression coil spring is disposed between the fixed plate 34 and the movable contact 20 in a state of being extrapolated to the movable shaft 21, and the movable contact portion 20b contacts the fixed contact 11a. The movable contact 20 is elastically biased in the direction (upward direction) to be performed.

  A joining member 35 is disposed between the sealing container 10 and the fixed plate 34. The joining member 35 is formed in a substantially cylindrical shape from a metal material, and the inner peripheral edge of the opening on the upper end side is located inside the inner peripheral surface of the sealing container 10. An upper end portion of the joining member 35 is hermetically joined to the opening end portion of the sealing container 10, and a lower end portion thereof is hermetically joined to the fixing plate 34. Further, the joining member 35 is bent along the entire circumference of the cylindrical portion, and the opening cross section on the lower end side is formed larger than the opening cross section on the upper end side. The joining member 35 is hermetically joined to the sealing container 10 and the fixed plate 34 described above, thereby forming an airtight space for accommodating the fixed contact 11a and the movable contact portion 20b, the fixed iron core 30 and the movable iron core 31. In addition, a gas mainly composed of hydrogen is hermetically sealed in this hermetic space.

  Next, the drive block B will be described. The drive block B includes a coil 41 formed by winding a coil winding around a coil bobbin 40 and a yoke 42 surrounding the coil 41. The yoke 42 is formed in a substantially U shape with a central piece and both opposing pieces, and a through hole 42a through which the bottomed cylindrical portion 33 is inserted is provided in the central piece. The yoke 42 forms a magnetic circuit together with the fixed iron core 30, the movable iron core 31, and the fixed plate 34.

  The operation of the above-described conventional example will be described below. Before the coil 41 is excited, the movable contact portion 20b faces the fixed contact 11a with a predetermined distance (contact gap). When the coil 41 is excited, the movable iron core 31 is attracted to and moved by the fixed iron core 30, so that the movable shaft 21 is driven as the movable iron core 31 moves, and the movable contact portion 20 b gradually reduces the contact gap. Eventually, it comes into contact with the fixed contact 11a. When the excitation of the coil 41 is cut off, the movable contact 20 is returned mainly by the urging force of the return spring 32 and displaced in the reverse direction, the movable contact portion 20b is separated from the fixed contact 11a, and the movable iron core 31 is also predetermined. It returns by the distance of and returns to the original state.

  Here, between the movable contact 20 and the fixed plate 34, there is an insulating member 37 that insulates the arc generated between the fixed contact 11 a and the movable contact portion 20 b and the joined portion between the sealing container 10 and the joining member 35. It is arranged. As shown in FIG. 6B, the insulating member 37 is formed in an approximately rectangular parallelepiped shape having an upper surface opened from an insulating material such as ceramic or synthetic resin, and the movable shaft 21 is inserted through the approximate center of the lower bottom portion. An insertion hole 37a is provided therethrough. A substantially rectangular flat plate-shaped flange portion 37 b that protrudes outward is integrally formed on the lower bottom portion of the insulating member 37. In addition, a pair of holding springs 38 formed by bending both ends downward is disposed below the insulating member 37, and the pressing spring 38 and the joining member 35 are pressed by the upward biasing force of the holding spring 38. The insulating member 37 is held by sandwiching the flange portion 37b therebetween.

Thus, even when the movable contact portion 20b is removed from the fixed contact 11a, the arc generated by the insulating member 37 does not contact the joint portion between the sealing container 10 and the joint member 35. It is possible to prevent the gas hermetically sealed from being broken and leaking.
Japanese Patent Laid-Open No. 10-326530

  However, in the conventional example, since the pressing spring 38 is required to hold the insulating member 37, there is a problem in that the number of parts increases by the amount of the pressing spring 38 and the manufacturing cost increases.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a contact device that can reduce the number of parts required to hold an insulating member and reduce the manufacturing cost.

  In order to achieve the above object, a contact block comprising: a fixed terminal having a fixed contact portion; and a movable contact having a movable contact portion contacting and separating from the fixed contact portion in a sealed container. A movable shaft fixed to one end of the movable contact, 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 iron core, and both iron cores Drive block that generates a magnetic attraction force to move the movable iron core in the direction of contact with the fixed iron core, a return spring that urges the movable iron core in a direction in which the movable contact portion separates from the fixed contact portion, and the movable contact portion is fixed A contact pressure spring that urges the movable contact in a direction to contact the contact portion, a bottomed cylindrical portion that houses both iron cores, and a metal material that is hermetically bonded to the bottomed cylindrical portion by fixing the fixed core. 1 is joined to the sealing member and the first joining member. A second joining member made of a metal material that forms an airtight space for accommodating both contact portions and both iron cores, and a joining portion between the arc and the sealed container and the second joining member generated between both contact portions; An insulating member that insulates, and the insulating member is disposed between the movable contact and the first joining member. The contact pressure spring has one end abutting on the movable contact and the other end insulated. The return spring is disposed in a compressed state between the movable contact and the insulating member in contact with the member. The return spring has one end in contact with the movable iron core and the other end in contact with the insulating member, and the movable iron core and the insulating member. And the return spring has a higher spring coefficient than the contact pressure spring.

  According to a second aspect of the present invention, in the first aspect of the invention, the insulating member is provided with a dustproof rubber that covers at least the insertion hole through which the movable shaft is inserted, and the other end of the contact pressure spring is a dustproof rubber. It is characterized in that it is fixed to an insulating member with a pinch in between.

  In the invention of claim 3, in the invention of claim 1 or 2, the bottomed tube portion is provided with a cap that covers the opening of one end portion thereof and fixes the fixed iron core between the bottomed tube portion and is insulated. The member is provided with either one of a positioning convex portion and a positioning concave portion that are fitted to each other, and the first joining member or the cap is provided with either the positioning convex portion or the positioning concave portion. .

  The invention of claim 4 is characterized in that, in the invention of claim 3, a plurality of positioning protrusions and positioning recesses are provided.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the first joining member and the cap are each provided with one or more positioning convex portions, and the insulating member is positioned corresponding to each positioning convex portion. A concave portion is provided.

  The invention of claim 6 is the invention of any one of claims 1 to 5, wherein the insulating member is provided over the circumferential direction of the other end of the contact pressure spring, and the other end of the contact pressure spring is provided. A rib for positioning is provided.

  The invention according to claim 7 is the invention according to any one of claims 1 to 5, wherein the contact pressure spring is a coil spring, and the insulating member is provided along the inside of the other end of the contact pressure spring. And a rib for positioning the other end of the contact pressure spring.

  The invention of claim 8 is characterized in that, in the invention of claim 6 or 7, the rib is formed with a taper for drawing the other end of the contact pressure spring.

  According to the invention of claim 1, since the return spring has a higher spring coefficient than the contact pressure spring, the movable contact is biased in the direction toward the insulating member, and the insulating member is held by the biasing force of the contact pressure spring. Therefore, the holding spring for holding the insulating member is not required as in the prior art, and therefore the number of parts required to hold the insulating member can be reduced and the manufacturing cost can be reduced.

  According to the second aspect of the present invention, the dust-proof rubber prevents foreign matter such as consumable powder generated by the contact and separation between the fixed contact portion and the movable contact portion from entering the inside of the apparatus through the insertion hole of the insulating member. Can be disposed without providing a separate member for holding.

  According to the invention of claim 3, since the insulating member is positioned on the first bonding member or cap by the positioning convex portion and the positioning concave portion respectively provided on the insulating member and the first bonding member or cap, the device The insulating member can be easily disposed at the time of assembly.

  According to the fourth and fifth aspects of the present invention, since the insulating member can be positioned while preventing the rotation of the insulating member by the plurality of positioning convex portions and the positioning concave portion, it is necessary to arrange the insulating member while adjusting the displacement due to the rotation of the insulating member. Therefore, the assembly process can be simplified and the manufacturing cost can be reduced.

  According to the sixth and seventh aspects of the invention, since the other end of the contact pressure spring can be positioned on the insulating member, the contact pressure spring can be easily attached to the insulating member.

  According to the eighth aspect of the present invention, the other end portion of the contact pressure spring is guided and positioned by the taper, so that the contact pressure spring can be more easily attached to the insulating member.

  Hereinafter, embodiments of a contact device according to the present invention will be described with reference to the drawings. However, since the basic configuration of this embodiment is the same as that of the conventional example, common portions are denoted by the same reference numerals and description thereof is omitted. In the following description, the top and bottom in FIG.

  In this embodiment, as shown in FIG. 1 (a), a pair of fixed terminals 11 having a fixed contact 11a as a fixed contact portion and a movable contact 20 having a movable contact portion 20b contacting and separating from the fixed contact 11a are provided. The contact block A housed in the sealing container 10, the movable shaft 21 to which the movable contact 20 is fixed at the upper end, the movable iron core 31 fixed to the lower end of the movable shaft 21, and the movable shaft 21 are extrapolated. The fixed iron core 30 that faces the movable iron core 31, the drive block B that generates a magnetic attraction force between the two iron cores to move the movable iron core 31 in the direction of contact with the fixed iron core 30, and the movable contact portion 20b from the fixed contact 11a. A return spring 32 that urges the movable iron core 31 in the direction of separation, a contact pressure spring 22 that urges the movable contact portion 20b in a direction to abut against the fixed contact 11a, and a bottomed cylindrical portion 33 that houses both iron cores. , Fixed iron core 30 A fixed plate 34 that is a first joining member made of a metal material that is attached and hermetically joined to the bottomed cylindrical portion 33, and a fixed contact 11 a and a movable contact portion 20 b that are hermetically joined to the sealing container 10 and the fixed plate 34. And a joining member 35 which is a second joining member made of a metal material forming an airtight space for accommodating both iron cores, an arc generated between the fixed contact 11a and the movable contact portion 20b, and the sealing container 10 and the joining member. And an insulating member 37 that insulates the joint portion with the member 35.

  In this embodiment, the fixed contact 11a made of a contact material fixed to the lower end portion of the fixed terminal 11 is the fixed contact portion. However, the lower end portion of the fixed terminal 11 is fixed to the fixed contact without providing the fixed contact 11a. It does not matter as part. Further, in this embodiment, the portion of the movable contact 20 where the fixed contact 11a contacts and separates is the movable contact portion 20b, but a movable contact (not shown) made of a contact material is fixed to the portion, The movable contact may be a movable contact portion.

  A flange portion 30c protruding in the radial direction is integrally formed at the upper end portion of the fixed iron core 30, and silicon rubber or the like that absorbs vibration generated when the movable iron core 31 hits the fixed iron core 30 or the like. A shock absorber 5 made of an elastic material is attached. In addition, a substantially rectangular plate-shaped cap 36 is disposed on the upper side of the shock absorber 5, that is, on the upper end opening side of the bottomed cylindrical portion 33. As shown in FIG. 1B, the cap 36 is formed into a flat bottomed rectangular tube by processing a plate-shaped metal member, and a movable shaft is inserted into an insertion hole 36a provided in the center of the bottom plate. The fixed iron core 30 is fixed to the bottomed cylindrical portion 33 by being joined to the upper surface of the fixing plate 34 in a state in which 21 is inserted, and the fixed iron core 30 is prevented from coming off. Further, the portion of the cap 36 that is not joined to the fixing plate 34 protrudes upward from the portion that is joined to the fixing plate 34, and the portion protruding upward fits with a positioning recess 37c described later. It is part 36b.

  An insertion hole 30a through which the movable shaft 21 is inserted is provided along the axial direction at substantially the center of the cross section of the fixed iron core 30, and a return spring 32 is disposed in the insertion hole 30a so as to be externally inserted into the movable shaft 21. Is done. The lower end of the return spring 32 abuts on the upper end surface of the movable core 31, and the upper end abuts on the lower bottom of the cap 36 through the insertion hole 5 a penetrating the shock absorber 5 and the movable iron core 31. By being disposed in a compressed state between the cap 36 and the cap 36, the movable iron core 31 is urged downward, that is, in a direction away from the fixed iron core 30. At the same time, the movable shaft 21 connected to the movable iron core 31 is also biased downward.

  The insulating member 37 is formed in a substantially rectangular parallelepiped shape whose upper surface is opened from an insulating material such as ceramic or synthetic resin, and an insertion hole 37a having a substantially circular cross section through which the movable shaft 21 is inserted penetrates substantially the center of the lower bottom portion. It is installed. In addition, a positioning recess 37c is provided on the lower surface of the insulating member 37 and is surrounded by a peripheral wall having a substantially rectangular cross section protruding downward.

  Further, as shown in FIG. 3B, a rib for positioning the lower end portion of the contact pressure spring 22 is provided on the inner bottom portion of the insulating member 37 over the circumferential direction of the lower end portion of the contact pressure spring 22. 37d is provided, and the lower end portion of the contact pressure spring 22 contacts the inside of the rib 37d. Here, the contact pressure spring 22 has its upper end abutted against the movable contact 21 and is disposed in a compressed state between the movable contact 21 and the insulating member 37. In this embodiment, the return spring 32 is in contact with the contact pressure spring 22. Since the spring coefficient is higher than that of the pressure spring 22, the movable contact 21 connected to the movable shaft 21 is urged downward. Thus, the contact pressure spring 22 urges the movable contact 20 in the upward direction, that is, in the direction in which the movable contact portion 20b contacts the fixed contact 11a, and urges the insulating member 37 downward.

  A dustproof rubber 39 is disposed inside the rib 37d. As shown in FIG. 3A, the dust-proof rubber 39 includes a bottomed cylindrical tube portion 39b through which an insertion hole 39a through which the movable shaft 21 is inserted, and a radial direction from the lower end edge of the tube portion 39b. Consumable powder produced by the contact and separation of the fixed contact 11a and the movable contact 20b, and the peripheral wall 39d protruding upward from the outer periphery of the flange 39c. And the like to prevent the foreign material such as the insulating member 37, the cap 36, the shock absorber 5 and the fixed iron core 30 from entering the movable iron core 31 through the insertion holes 37a, 36a, 5a, 30a. As shown in FIG. 3B, the dust-proof rubber 39 is positioned at the lower end portion of the contact pressure spring 22 between the cylindrical portion 39b and the peripheral wall portion 39d on the upper surface of the flange portion 39c. In the same manner as above, the contact pressure spring 22 biases it downward.

  Thus, the insulating member 37 is fitted between the positioning convex portion 36b of the cap 36 in the positioning concave portion 37c, so that the insulating member 37 is interposed between the lower end portion of the contact pressure spring 22 and the upper end portion of the return spring 32 via the cap 36. It is held and held by the downward biasing force of the contact pressure spring 22. Therefore, the pressing spring 38 for holding the insulating member 37 as in the conventional example is not required, and the number of parts required to hold the insulating member 37 can be reduced, thereby reducing the manufacturing cost. Further, since the dustproof rubber 39 is also held by the downward biasing force of the contact pressure spring 22 like the insulating member 37, the dustproof rubber 39 can be disposed without using another holding member.

  Further, since the rib 37d is provided on the inner bottom portion of the insulating member 37, the lower end portion of the contact pressure spring 22 can be positioned on the insulation member 37, and the contact pressure spring 22 can be easily attached to the insulation member 37. . Here, as shown in FIG. 3C, a taper 37e for drawing the lower end of the contact pressure spring 22 into the rib 37d may be formed. In this case, since the lower end portion of the contact pressure spring 22 is guided and positioned by the taper 37e, the contact pressure spring 22 can be attached to the insulating member 37 more easily.

  Incidentally, the rib 37d may be provided along the inner peripheral surface of the lower end portion of the contact pressure spring 22, as shown in FIGS. 5 (c) and 5 (d). Even in this case, the lower end portion of the contact pressure spring 22 can be positioned on the insulating member 37 as described above, and the contact pressure spring 22 can be easily attached to the insulating member 37. The effects of the rib 37d and the taper 37e can be achieved even when the dustproof rubber 39 is not provided as shown in FIGS. 4 (a) and 4 (b) and FIGS. 5 (a) and 5 (b). Needless to say, you can.

  By the way, in the conventional example, the side surface of the insulating member 37 and the flange portion 37b are brought into contact with the inner surface of the sealing container 10 and the inner surface of the bonding member 35, thereby positioning in the vertical direction and the rotational direction about the vertical direction. It was. For this reason, when the insulating member 37 is attached, it is necessary to perform the attaching operation while adjusting the deviation in the vertical direction and the rotational direction. On the other hand, in the present embodiment, the insulating member 37 can be positioned in the vertical direction simply by fitting the positioning concave portion 37c and the positioning convex portion 36b, and the cap 36 has a substantially rectangular flat plate shape. Positioning can be performed while preventing the member 37 from rotating. Accordingly, it is not necessary to arrange the insulating member 37 while adjusting the shift caused by the rotation of the insulating member 37, and the assembly process can be simplified and the manufacturing cost can be reduced.

  When the cap 36 has a substantially disk shape, as shown in FIG. 2A, a substantially rectangular flat plate-like positioning convex portion 34b protruding upward is fixed by a method such as driving out from the lower surface of the fixing plate 34. Positioning can be performed in the same manner as described above by forming on the upper surface of the plate 34 and fitting the positioning convex portion 34b and the positioning concave portion 37c. Further, as shown in FIG. 2B, a pair of substantially cylindrical positioning projections 36b are provided on the upper surface of the substantially disc-shaped cap 36, and a pair of positioning recesses 37c corresponding to these positioning projections 36b are provided. You may provide in the lower bottom part of the insulating member 37. FIG. Also in this case, positioning in the rotational direction can be performed by the pair of positioning convex portions 36b.

  Further, as shown in FIG. 2 (c), the substantially disk-shaped cap 36 itself is used as a positioning convex portion 36b, and a substantially cylindrical positioning convex portion 34b protruding upward is formed on the upper surface of the fixing plate 34. A pair of positioning recesses 37 c corresponding to these positioning protrusions 36 b may be provided on the lower bottom of the insulating member 37. Also in this case, positioning in the rotational direction can be performed by the pair of positioning convex portions 36b. In the above description, the positioning concave portion 37c is provided in the insulating member 37, and the positioning convex portions 34b and 36b are provided in the fixing plate 34 and the cap 36. However, the positioning convex portion is provided in the insulating member 37, and the positioning concave portions are provided in the fixing plate 34 and the cap 36. You may comprise as follows.

It is a figure which shows embodiment of the contact apparatus which concerns on this invention, (a) is sectional drawing, (b) is a perspective view which shows the attachment method of an insulating member. (A)-(c) is a perspective view which shows the other attachment method of the insulating member same as the above. It is explanatory drawing of the rubber | gum for dustproof same as the above, (a) is a perspective view, (b) is principal part sectional drawing at the time of arrange | positioning dustproof rubber, (c) forms a taper in the rib of (b) It is principal part sectional drawing at the time of doing. It is a figure which shows the case where the rubber | gum for dustproof same as the above is remove | excluded, (a) is principal part sectional drawing, (b) is principal part sectional drawing at the time of forming a taper in the rib of (a). It is a figure which shows the case where a rib is provided inside the contact pressure spring same as the above, (a), (b) is a sectional view of the main part when dust-proof rubber is removed, and (c), (d) are for dust-proof. It is principal part sectional drawing at the time of arrange | positioning rubber | gum. It is a figure which shows the conventional contact apparatus, (a) is sectional drawing, (b) is a perspective view of an insulating member and a pressing spring.

Explanation of symbols

10 Sealing container 11 Fixed terminal 11a Fixed contact (fixed contact)
DESCRIPTION OF SYMBOLS 20 Movable contact 20b Movable contact part 21 Movable shaft 22 Contact pressure spring 30 Fixed iron core 31 Movable iron core 32 Return spring 33 Bottomed cylinder part 34 Fixed plate (1st joining member)
35 Joining member (second joining member)
37 Insulating material A Contact block B Drive block

Claims (8)

  A fixed terminal having a fixed contact portion; a contact block having a movable contact having a movable contact portion contacting and separating from the fixed contact portion in a sealed container; and a movable shaft on which the movable contact is fixed to one end side; , 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 iron core, and a direction in which the movable iron core hits the fixed iron core by generating a magnetic attractive force between the two iron cores A drive block to be moved, a return spring that urges the movable iron core in a direction in which the movable contact portion is separated from the fixed contact portion, and a contact that urges the movable contact in a direction in which the movable contact portion abuts the fixed contact portion. A pressure spring, a bottomed cylindrical portion that houses both iron cores, a first joining member made of a metal material that is fixedly fixed to the bottomed cylindrical portion and is hermetically joined to the bottomed cylindrical portion, a sealing container, and a first joining member Airtight space for accommodating both contact parts and both iron cores. A second joining member made of a metal material to be formed; and an insulating member that insulates a joining portion between the arc and the sealed container and the second joining member that are generated between the two contact portions. The contact pressure spring is disposed between the child and the first joining member, and one end of the contact spring abuts on the movable contact and the other end abuts on the insulating member and between the movable contact and the insulating member. The return spring is disposed in a compressed state. One end of the return spring is in contact with the movable iron core, the other end is in contact with the insulating member, and the return spring is disposed in a compressed state between the movable iron core and the insulating member. A contact device having a higher spring coefficient than a pressure spring.   The insulating member is provided with a dustproof rubber that covers at least the insertion hole through which the movable shaft is inserted, and the other end of the contact pressure spring is fixed to the insulating member with the dustproof rubber interposed therebetween. The contact device according to claim 1.   The bottomed cylinder part is provided with a cap for covering the opening at one end thereof and fixing the fixed iron core to and from the bottomed cylinder part, and the insulating member includes a positioning convex part and a positioning concave part that are fitted to each other. 3. The contact device according to claim 1, wherein either one of the positioning projections and the positioning recess is provided on the first joining member or the cap.   The contact device according to claim 3, wherein a plurality of the positioning convex portions and the positioning concave portions are provided.   5. The first joining member and the cap are each provided with one or more positioning convex portions, and the insulating member is provided with a positioning concave portion corresponding to each positioning convex portion. The contact device described.   6. The insulating member according to claim 1, wherein a rib is provided in the circumferential direction of the other end portion of the contact pressure spring to position the other end portion of the contact pressure spring. The contact device according to any one of the above.   The contact pressure spring is a coil spring, and the insulating member is provided with a rib provided along the inner side of the other end of the contact pressure spring to position the other end of the contact pressure spring. 6. The contact device according to claim 1, wherein the contact device is characterized in that: 8. The contact device according to claim 6, wherein the rib is formed with a taper for drawing the other end of the contact pressure spring.

Images