JP2014130770A - Contact device and electromagnetic relay mounting contact device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a contact device which allows for enhancement of assembling workability while minimizing reduction of operability of a drive shaft, and to obtain an electromagnetic relay mounting the contact device.SOLUTION: A contact device 1 includes a contact block 3 having a contact part 60 formed of a fixed contact 35a and a movable contact 29b, and a drive block 2 having a drive shaft 25, and driving a movable contact 29 so that the movable contact 29b comes into contact and out of contact with the fixed contact 35a. Furthermore, a partition wall 80 partitioning a space S1 in which the contact part 60 is arranged and a space S2 housing the drive shaft 25 of the drive block 2 is included. The partition wall 80 has a press part 81 being pressed by a presser part 49, and a wall 82 extending from the press part 81 and contractible in the extension direction.

Description

  The present invention relates to a contact device and an electromagnetic relay equipped with the contact device.

  Conventionally, as a contact device, a contact block having a fixed terminal provided with a fixed contact, a movable contact provided with a movable contact contacting and separating from the fixed contact, and a drive block having a drive shaft for driving the movable contact (For example, refer to Patent Document 1).

  In Patent Document 1, by providing an elastic cover that covers a gap formed between the drive shaft and the fixed iron core, the elastic cover can suppress the ingress of contact powder into the space in which the movable iron core is stored. ing.

  Thus, by suppressing the penetration of the contact powder into the space in which the movable iron core is housed, the operability of the drive shaft is prevented from deteriorating.

Japanese Patent Laying-Open No. 2005-038706

  However, in the above-described conventional technology, the elastic cover is formed so that one opening has a cylindrical shape larger than the other opening. The inner peripheral surface of the small opening is in elastic contact with the entire outer periphery of the drive shaft. In addition, an annular piece projects from the outer periphery of the large opening, and the annular piece is coupled to the joining member by an adhesive or the like. In such a structure of the above prior art, the work for inserting into the opening on the small side of the drive shaft, the work for bonding the annular piece, and the like are time-consuming, so the assemblability is not so high.

  Accordingly, an object of the present invention is to obtain a contact device that can improve the assembly workability while suppressing the operability of the drive shaft from being lowered, and an electromagnetic relay equipped with the contact device.

  A first feature of the present invention includes a contact block having a contact portion formed by a fixed contact and a movable contact contacting and separating from the fixed contact, and a drive shaft to which the movable contact having the movable contact is attached. A drive block that drives the movable contact so that the movable contact contacts and separates from the fixed contact, wherein the space in which the contact portion is disposed and the drive shaft of the drive block It is provided with a partition wall that partitions the space to be accommodated, and the partition wall includes a pressing portion that is pressed by the pressing portion, and a wall portion that extends from the pressing portion and can contract in the extending direction. And

  The gist of the second feature of the present invention is that at least the wall portion of the partition wall is formed of rubber.

  The gist of the third feature of the present invention is that at least the wall portion of the partition wall is made of metal.

  A fourth feature of the present invention is summarized as that at least the wall portion of the partition wall is formed of a molding material.

  The fifth feature of the present invention is summarized in that a thin portion is formed at the free end portion of the wall portion.

  The sixth feature of the present invention is summarized as that the thin portion is formed of a member different from the wall portion.

  According to a seventh feature of the present invention, the drive block includes a fixed iron core, iron core rubber is disposed between the fixed iron core and the pressing portion, and the partition wall includes the iron core. The gist is that it also serves as a core rubber.

  According to an eighth feature of the present invention, the partition wall is formed with a communicating portion that communicates a space in which the contact portion is disposed and a space in which the drive shaft of the drive block is accommodated in at least the wall portion. It is a summary.

  The ninth feature of the present invention is summarized in that the contact device is mounted on an electromagnetic relay.

  ADVANTAGE OF THE INVENTION According to this invention, the contact device which can improve assembly work property | operativity, suppressing the operativity of a drive shaft falling, and the electromagnetic relay carrying the said contact device can be obtained.

It is a perspective view which shows the electromagnetic relay concerning one Embodiment of this invention. It is a disassembled perspective view of the electromagnetic relay concerning one Embodiment of this invention. It is a disassembled perspective view which decomposes | disassembles and shows a part of contact apparatus concerning one Embodiment of this invention. It is a figure which shows the electromagnetic relay concerning one Embodiment of this invention, Comprising: (a) is a sectional side view, (b) is a sectional side view cut | disconnected in the direction orthogonal to Fig.4 (a). It is sectional drawing which expands and shows the contact part of the contact apparatus concerning one Embodiment of this invention. It is a perspective view which shows the shape of the dustproof part concerning one Embodiment of this invention. It is sectional drawing which expands and shows the state which the contact parts of the contact device concerning one Embodiment of this invention contact | abutted. It is sectional drawing which expands and shows the contact part of the contact apparatus concerning the 1st modification of one Embodiment of this invention. It is sectional drawing which shows the shape of the dustproof part concerning the 2nd modification of one Embodiment of this invention. It is sectional drawing which shows the shape of the dustproof part concerning the 3rd modification of one Embodiment of this invention. It is sectional drawing which expands and shows the contact part of the contact apparatus concerning the 4th modification of one Embodiment of this invention. It is sectional drawing which expands and shows the contact part of the contact apparatus concerning the 5th modification of one Embodiment of this invention. It is sectional drawing which expands and shows the contact part of the contact apparatus concerning the 6th modification of one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the upper, lower, left, and right in FIG.

  The electromagnetic relay 100 according to the present embodiment is a so-called normally open type in which the contact is turned off in the initial state, and as shown in FIGS. 1 to 3, the drive block 2 located at the bottom and the contact block located at the top 3 is integrally provided. The contact device 1 is housed in a hollow box type case 5. It is also possible to use a so-called normally closed electromagnetic relay that is contact-on in the initial state.

  The case 5 includes a substantially rectangular case base 7 and a case cover 9 that accommodates mounting components such as the drive unit 2 and the contact unit 3 disposed so as to cover the case base 7.

  The case base 7 is provided with a pair of slits 71 and 71 to which the pair of coil terminals 20 are respectively attached on the lower side in FIG. In addition, the case base 7 is provided with a pair of slits 72, 72 on which the terminal portions 10b, 10b of the pair of main terminals 10, 10 are mounted on the upper side in FIG. On the other hand, the case cover 9 is formed in a hollow box shape in which the case base 7 side is opened. The insertion hole 71 has substantially the same shape as that of the coil terminal 20, and the insertion hole 72 has substantially the same shape as that of the terminal portion 10 b of the main terminal 10.

  The drive block 2 includes a hollow cylindrical coil bobbin 11 around which the coil 13 is wound, and a pair of coil terminals 20 fixed to the coil bobbin 11 and connected to both ends of the coil 13.

  The coil bobbin 11 includes substantially circular flange portions 11c protruding in the circumferential direction at both upper and lower ends of the cylindrical portion, and a winding drum portion 11d around which the coil 13 is wound is formed between the upper and lower flange portions 11c. ing.

  The coil terminals 20 are formed in a flat plate shape using a conductive material such as copper, and the pair of coil terminals 20 are provided with relay terminals 20a. Each relay terminal 20a is soldered in a state in which lead wires at both ends of the coil 13 wound around the coil bobbin 11 are entangled.

  The drive block 2 is driven by energizing the coil 13 via the pair of coil terminals 20. Driving the drive block 2 in this way opens and closes a contact portion 60 composed of a fixed contact 35a and a movable contact 29b of the contact block 3 to be described later, thereby conducting and non-conducting between the pair of fixed terminal blocks 35. Can be switched.

  The drive block 2 includes a yoke 6 made of a magnetic material and surrounding the coil bobbin 11. In the present embodiment, the yoke 6 is composed of a rectangular yoke upper plate 21 that abuts on the upper end surface of the coil bobbin 11 and a rectangular yoke 19 that abuts on the lower end surface and side surfaces of the coil bobbin 11. , Open in the front-rear direction.

  The yoke 19 is disposed between the coil 13 and the case 5, and the yoke 19 includes a bottom wall 19a and a pair of side walls 19b and 19b rising from the periphery of the bottom wall 19a. In the present embodiment, the bottom wall 19a and the pair of side walls 19b, 19b are formed integrally by bending a single plate. An annular through hole 19c is formed in the bottom wall 19a of the yoke 19, and a bush 16 made of a magnetic material is attached to the through hole 19c. And the yoke upper board 21 mentioned above is arrange | positioned so that the coil 13 wound around the coil bobbin 11 may be covered in the front end side (upper end side) of a pair of side wall 19b of the yoke 19 and 19b.

  The drive block 2 is fixed inside the cylinder of the coil bobbin 11 and magnetized by the energized coil 13, and the fixed iron core 15 is opposed in the vertical direction (axial direction), and the cylinder of the coil bobbin 11. And a movable iron core 17 disposed therein. The fixed iron core 15 is formed in a substantially cylindrical shape, and a flange portion 15b is provided so as to protrude in the circumferential direction at the upper end of the protruding portion 15a in which the through hole 15c is formed.

  Furthermore, in this embodiment, the drive block 2 includes a plunger cap 14 made of a magnetic material and formed in a bottomed cylindrical shape with an upper surface opened between the fixed iron core 15 and the movable iron core 17 and the coil bobbin 11. I have. In the present embodiment, a plunger cap 14 is disposed in a through hole 11 a formed at the center of the coil bobbin 11. At this time, an annular seat surface 11b is formed on the upper side of the coil bobbin 11, and the flange portion 14a of the plunger cap 14 is placed on the seat surface 11b. And the protrusion part 14b of the plunger cap 14 is fitted by the through-hole 11a. Further, the fixed iron core 15 and the movable iron core 17 are accommodated in a plunger cap 14 provided inside the cylinder of the coil bobbin 11. The fixed iron core 15 is disposed on the opening side of the plunger cap 14.

  Further, the fixed iron core 15 and the movable iron core 17 are each formed in a columnar shape whose outer diameter is substantially the same as the inner diameter of the plunger cap 14, and the movable iron core 17 slides inside the cylinder of the plunger cap 14. It has become. The moving range of the movable iron core 17 is set between an initial position away from the fixed iron core 15 and a contact position where the movable iron core 15 contacts the fixed iron core 15. Further, between the fixed iron core 15 and the movable iron core 17, a return spring 23 made of a coil spring and energizing the movable iron core 17 in a direction to return it to the initial position is interposed. The movable iron core 17 is urged by the return spring 23 in a direction away from the fixed iron core 15 (upper side in FIG. 4). In the present embodiment, the through hole 15c of the fixed iron core 15 is provided with a protrusion 15d that protrudes toward the center side to reduce the hole diameter, and the lower surface 15f of the protrusion 15d is a return spring. 23 spring receiving portions.

  Further, an insertion hole 21 a through which the fixed iron core 15 is inserted is provided in the center portion of the yoke upper plate 21. When inserting the fixed iron core 15, the cylindrical portion 15 b of the fixed iron core 15 is inserted from the upper surface side of the yoke upper plate 21. At this time, a concave portion 21b having substantially the same diameter as the flange portion 15b of the fixed iron core 15 is provided at the approximate center of the upper surface of the yoke upper plate 21, and the flange portion 15b of the fixed iron core 15 is fitted into the concave portion 21b. The stopper is made.

  Further, a pressing plate 49 made of metal is provided on the upper surface side of the yoke upper plate 21, and left and right end portions are fixed to the upper surface of the yoke upper plate 21. And the convex part of the center of the pressing board 49 is provided so that the space which accommodates the flange part 15b of the fixed iron core 15 which protruded from the upper surface of the yoke upper board 21 may be formed. Furthermore, in this embodiment, an iron core rubber 18 made of a material having rubber elasticity (for example, synthetic rubber) is provided (arranged) between the fixed iron core 15 and the pressing plate 49, and the fixed iron core 15 is arranged. Is not directly transmitted to the holding plate 49. The iron core rubber 18 is formed in a disc shape, and an insertion hole 18a through which a shaft (driving shaft) 25 (described later) is inserted is provided at the center. Furthermore, in this embodiment, the iron core rubber 18 is fitted to the fixed iron core 15 so as to wrap the flange portion 15b.

  In addition, a dust-proof wall (partition wall) 80 is provided between the iron core rubber 18 and the pressing plate 49 for suppressing contact powder from entering the space in which the movable iron core 17 is stored. The dust barrier wall (partition wall) 80 includes a flange portion (pressing portion) 81 and a peripheral wall portion (wall portion) 82 extending so as to rise from the flange portion 81, and a shaft described later is provided at the center portion. An insertion hole 80a through which the (drive shaft) 25 is inserted is provided.

  A flange portion 14 a protruding in the circumferential direction is formed on the opening side of the plunger cap 14, and the flange portion 14 a is fixed around the insertion hole 21 a on the lower surface of the yoke upper plate 21. And the lower end bottom part of the plunger cap 14 is penetrated by the bush 16 with which the through-hole 19c of the bottom wall 19a was mounted | worn. At this time, the movable iron core 17 housed in the lower portion of the plunger cap 14 is magnetically joined to the peripheral portion of the bush 16.

  With this configuration, when the coil 13 is energized, the opposed surface of the fixed iron core 15 to the movable iron core 17 and the peripheral portion of the bush 16 on the bottom wall 19a have different polarities as a pair of magnetic pole portions. Thus, the movable iron core 17 is attracted to the fixed iron core 15 and moved to the contact position. On the other hand, when energization of the coil 13 is stopped, the movable iron core 17 is returned to the initial position by the return spring 23. The return spring 23 is inserted into the insertion hole 15 c of the fixed iron core 15, and the upper end is in contact with the lower surface 15 f of the protrusion 15 d and the lower surface is in contact with the upper surface of the movable iron core 17. Furthermore, in the present embodiment, a damper rubber 12 made of a material having rubber elasticity and having a diameter substantially the same as the outer diameter of the movable iron core 17 is provided at the bottom of the plunger cap 14.

  Further, a contact block 3 that opens and closes a contact in response to energization of the coil 13 is provided above the drive block 2.

  The contact block 3 includes a base 41 formed in a box shape whose lower surface is opened by a heat resistant material. The base 41 is provided with two insertion holes 41 a at the bottom, and a pair of fixed terminals 35 are inserted through the insertion holes 41 a with the lower flange 32 interposed therebetween. The fixed terminal 35 is formed in a cylindrical shape by a conductive material such as a copper-based material. A fixed contact 35a is formed at the lower end surface of the fixed terminal 35, a flange portion 35b protruding in the circumferential direction is formed at the upper end portion, and a convex portion 35c is provided at the center of the flange portion 35b. . The upper surface of the lower flange 32 and the flange portion 35 b of the fixed terminal 35 are hermetically joined by a silver solder 34, and the lower surface of the lower flange 32 and the upper surface of the base 41 are hermetically joined by a silver solder 36.

  The fixed terminal 35 is attached with a pair of main terminals 10 and 10 connected to an external load or the like. The main terminals 10 and 10 are formed in a flat plate shape using a conductive material, and an intermediate portion in the front-rear direction is bent in a step shape. The front terminals of the main terminals 10 and 10 are formed with insertion holes 10a and 10a through which the convex portions 35c of the fixed terminal 35 are inserted, and the convex portions 35c through which the insertion holes 10a and 10a are inserted are subjected to spin caulking. The main terminals 10 and 10 are fixed to the fixed terminal 35.

  Further, a movable contact 29 is disposed in the base 41 so as to straddle between the pair of fixed contacts 35a, and the movable contact 29b is provided at a position facing the fixed contact 35a on the upper surface of the movable contact 29, respectively. It has been. An insertion hole 29 a through which one end of the shaft 25 that connects the movable contact 29 to the movable iron core 17 is inserted is provided at the center of the movable contact 29.

  The shaft 25 is made of a non-magnetic material, and is formed in a circumferential direction on a shaft body portion 25b having a round bar shape that is long in the moving direction (vertical direction) of the movable iron core 17 and a portion protruding upward from the movable contact 29. And a flange portion 25a formed so as to protrude.

  Furthermore, an insulating plate 37 is formed between the movable contact 29 and the pressing plate 49 by an insulating material and is formed so as to cover the pressing plate 49, and a contact pressure formed by a coil spring through which the shaft 25 is inserted. And a spring 33. An insertion hole 37 a through which the shaft 25 is inserted is provided at the center of the insulating plate 37, and the movable contact 29 is biased upward by the contact pressure spring 33.

  Here, when the movable iron core 17 is in the initial position, the movable contact 29b and the fixed contact 35a are separated from each other, and when the movable iron core 17 is in the contact position, the movable contact 29b and the fixed contact 35a are in contact with each other. As described above, the positional relationship between the movable iron core 17 and the movable contact 29 is set. That is, when the coil 13 is not energized, the contact device 3 is turned off to insulate the fixed terminals 35 from each other, and when the coil 13 is energized, the contact block 3 is turned on to The fixed terminals 35 are electrically connected. The contact pressure between the movable contact 29b and the fixed contact 35a is secured by the contact pressure spring 33.

  By the way, when a current flows while the movable contact 29b of the movable contact 29 is in contact with the fixed contacts 35a and 35a, an electromagnetic repulsive force acts between the fixed contacts 35a and 35a and the movable contact 29 due to this current. To do. When an electromagnetic repulsive force acts between the fixed contacts 35a, 35a and the movable contact 29, the contact pressure decreases, the contact resistance increases, the Joule heat increases rapidly, or the contacts are separated to cause arc heat. May occur. For this reason, the movable contact 29b and the fixed contact 35a may be welded.

  Therefore, in this embodiment, the yoke 50 is provided so as to surround the movable contact 29. Specifically, movable contact is made between an upper yoke (first yoke) 51 disposed on the upper side of the movable contact 29 and a lower yoke (second yoke) 52 surrounding the lower side and the side of the movable contact 29. A yoke 50 surrounding the upper and lower surfaces and side surfaces of the child 29 is formed. In this way, the upper yoke 51 and the lower yoke 52 surround the movable contact 29 so that a magnetic circuit is formed between the upper yoke 51 and the lower yoke 52.

  By providing the upper yoke 51 and the lower yoke 52, when an electric current flows when the movable contact 29b and the fixed contacts 35a and 35a are in contact with each other, the upper yoke 51 and the lower yoke 52 are mutually connected based on the electric current. A magnetic force to be attracted is generated. Thus, the magnetic force attracting | sucking mutually generate | occur | produces, and the upper yoke 51 and the lower yoke 52 will mutually attract | suck. When the upper yoke 51 and the lower yoke 52 are attracted to each other, the movable contact 29 is pressed against the fixed contact 35a, and the operation of the movable contact 29 to be separated from the fixed contact 35a is restricted. In this way, by restricting the movement of the movable contact 29 from the fixed contact 35a, the movable contact 29b is attracted to the fixed contact 35a without repelling the fixed contact 35a. Is suppressed. As a result, contact welding due to arc generation can be suppressed.

  In the present embodiment, the upper yoke 51 is formed in a substantially rectangular plate shape, and the lower yoke 52 is substantially composed of a bottom wall portion 52a and side wall portions 52b formed so as to rise from both ends of the bottom wall portion 52a. It is formed in a U shape. At this time, as shown in FIG. 4A, the upper end surface of the side wall 52b of the lower yoke 52 is preferably brought into contact with the lower surface of the upper yoke 51. May not be brought into contact with the lower surface of the upper yoke 51.

  In the present embodiment, the movable contact 29 is urged upward by the contact pressure spring 33 via the lower yoke 52. Specifically, the contact pressure spring 33 has an upper end in contact with the lower surface of the lower yoke 52 and a lower end in contact with the upper surface 15e of the protrusion 15d. Thus, in the present embodiment, the upper surface 15 e of the protrusion 15 d is a spring receiving portion of the contact pressure spring 33.

  Further, the upper yoke 51, the lower yoke 52, and the pressing plate 49 are respectively formed with an insertion hole 51a, an insertion hole 52c, and an insertion hole 49a into which the shaft 25 is inserted.

  The movable contact 29 is attached to one end of the shaft 25 as follows.

  First, the movable iron core 17, the return spring 23, the yoke upper plate 21, the fixed iron core 15, the iron core rubber 18, the dust-proof wall (partition wall) 80, the pressing plate 49, the insulating plate 37, and the contact pressure spring 33 from the lower side. The lower yoke 52, the movable contact 29, and the upper yoke 51 are arranged in this order. At this time, the return spring 23 is inserted into the through hole 15c of the fixed iron core 15 in which the protrusion 15a is fitted into the through hole 21a of the yoke upper plate 21 and the through hole 14c of the plunger cap 14.

  Then, the main body portion 25b of the shaft 25 is inserted through the through holes 51a, 29a, 52c, 37a, 49a, 80a, 18a, 15c, 21a, the contact pressure spring 33, and the return spring 23 from the upper side of the upper yoke 51, The movable iron core 17 is connected by being inserted into the insertion hole 17a. In this embodiment, the shaft 25 is connected to the movable iron core 17 by crushing the tip and riveting as shown in FIG. Note that the shaft 25 may be connected to the movable iron core 17 by forming a thread groove on the other end of the shaft 25 and screwing it to the movable iron core 17.

  Thus, the movable contact 29 is attached to one end of the shaft 25. In the present embodiment, an annular seat surface 51b is formed on the upper side of the upper yoke 51, and the flange 25a of the shaft 25 is housed in the seat surface 51b, thereby suppressing upward projection of the shaft 25. However, the shaft 25 is prevented from coming off. The shaft 25 may be fixed to the upper yoke 51 by laser welding or the like.

  Further, the insertion hole 15 c provided in the fixed iron core 15 is set to have an inner diameter larger than the outer diameter of the shaft 25 so that at least the shaft 25 does not contact the fixed iron core 15. With this configuration, the movable contact 29 moves in the vertical direction in conjunction with the movement of the movable iron core 17.

  Further, in the present embodiment, in order to suppress an arc generated between the movable contact 29b and the fixed contact 35a when the movable contact 29b is separated from the fixed contact 35a, gas is sealed in the base 41. Yes. As such a gas, it is possible to use a mixed gas mainly composed of hydrogen gas, which is most excellent in heat conduction in a temperature region where an arc is generated. In order to seal this gas, in this embodiment, the upper flange 40 which covers the clearance gap between the base 41 and the yoke upper board 21 is provided.

  Specifically, the base 41 has a top wall 41b in which a pair of through-holes 41a are arranged side by side, and a rectangular tube-like wall portion 41c that rises from the periphery of the top wall 41b. It is formed in a hollow box shape in which the contact 29 side) is opened. And the base 41 is being fixed to the yoke upper board 21 via the upper flange 40 in the state which accommodated the movable contactor 29 inside the wall part 41c from the open lower side.

  In the present embodiment, the opening peripheral edge of the lower surface of the base 41 and the upper surface of the upper flange 40 are hermetically joined by the silver solder 38, and the lower surface of the upper flange 40 and the upper surface of the yoke upper plate 21 are hermetically joined by arc welding or the like. doing. Further, the lower surface of the yoke upper plate 21 and the flange portion 14a of the plunger cap 14 are hermetically joined by arc welding or the like. By doing so, a sealed space S in which a gas is sealed in the base 41 is formed.

  Furthermore, in parallel with the arc suppression method using gas, in this embodiment, arc suppression using a capsule yoke is also performed. The capsule yoke includes a magnetic member 30 and a pair of permanent magnets 31. The magnetic member 30 is formed in a substantially U shape by a magnetic material such as iron. The magnetic member 30 is integrally formed with a pair of side pieces 30a that oppose each other and a connecting piece 30b that connects the base end portions of both side pieces 30a.

  The permanent magnet 31 is attached to the both side pieces 30a of the magnetic member 30 so as to face the both side pieces 30a, respectively, and the permanent magnet 31 substantially contacts the base 41 with the moving direction of the movable contact 29a to the fixed contact 35a. Giving a direct magnetic field. As a result, the arc is stretched in a direction orthogonal to the moving direction of the movable contact 29 and is cooled by the gas sealed in the base 41, the arc voltage rapidly increases, and the arc voltage reduces the voltage between the contacts. When it exceeds, the arc is cut off. That is, in the electromagnetic relay 100 of this embodiment, an arc countermeasure is taken by magnetic blow by the capsule yoke and cooling by the gas sealed in the base 41. By doing so, the arc can be interrupted in a short time, and consumption of the fixed contact 35a and the movable contact 29b can be reduced.

  By the way, in the electromagnetic relay 100 of this embodiment, since the movable iron core 17 is guided in the movement direction (up-down direction) by the plunger cap 14, the position in the plane orthogonal to the movement direction is regulated. Therefore, the position of the shaft 25 connected to the movable iron core 17 in the plane orthogonal to the moving direction of the movable iron core 17 is also restricted. Furthermore, in this embodiment, the position of the shaft 25 in the plane orthogonal to the moving direction of the movable iron core 17 is also regulated by inserting the shaft 25 into the insertion hole 15 c in the fixed iron core 15. That is, the insertion hole 15 c of the fixed iron core 15 is formed so that the inner diameter of the portion where the protrusion 15 d is formed is approximately the same as the outer diameter of the shaft 25. That is, the diameter of the shaft 25 is set so as to move up and down while restricting the movement of the shaft 25 in the front and rear and right and left directions.

  With this configuration, the inclination of the shaft 25 with respect to the moving direction of the movable iron core 17 is restricted at the two locations of the plunger cap 14 and the protrusion 15 d of the fixed iron core 15. Therefore, even if the shaft 25 is inclined with respect to the moving direction of the movable iron core 17, the position of the shaft 25 in the plane perpendicular to the moving direction of the movable iron core 17 is the lower end of the movable iron core 17 and the fixed iron core 15. Therefore, the inclination of the shaft 25 is restricted. As a result, straightness of the shaft 25 is ensured, and the shaft 25 can be prevented from tilting.

  Here, in the present embodiment, the dust-proof wall (partition wall) 80 divides the sealing space S into the space S1 in which the contact portion 60 is disposed and the space in which the shaft 25 of the drive block 2 is accommodated (the shaft 25 and the drive block). 2 is formed so as to be partitioned.

  Specifically, the dust-proof wall (partition wall) 80 includes a flange portion (pressing portion) 81 pressed by a pressing plate (pressing portion) 49 and a peripheral wall portion (wall portion) extending so as to rise from the flange portion 81. 82). In the present embodiment, the flange portion (pressing portion) 81 is fixed by being pressed toward the fixed iron core 15 (more specifically, the iron core rubber 18) by the pressing plate (pressing portion) 49. It is fixed to the iron core 15 (drive block 2).

  Moreover, the peripheral wall part (wall part) 82 is formed so that it can shrink | contract in an axial direction (extension direction). The free end portion 82 a of the peripheral wall portion (wall portion) 82 is in contact with the lower surface of the lower yoke 52 over the entire periphery. In the present embodiment, the free end portion 82a is caused to follow the movement of a moving body (movable contactor, yoke, etc.) that moves with the shaft 25, and the moving body is kept in contact with the free end portion 82a. It can be moved as it is. That is, the peripheral wall portion (wall portion) 82 is elastically deformed with the movement of the moving body (movable contactor, yoke, etc.).

  Such a dustproof wall (partition wall) 80 can be obtained by forming at least the peripheral wall portion (wall portion) 82 with rubber. Thus, if it forms with rubber | gum, it will become possible to fix using the elastic force of rubber | gum, and it will become possible to improve a design freedom.

  Moreover, the above-mentioned dust-proof wall (partition wall) 80 can be obtained also by forming at least the surrounding wall part (wall part) 82 with a metal. If it carries out like this, heat-resistant temperature can be made high and it becomes possible to extend a use temperature range.

  Further, at least the peripheral wall portion (wall portion) 82 may be formed of a molding material such as resin. If it carries out like this, it will become possible to improve the shape freedom degree of the dust-proof wall (partition wall) 80, and it can improve a design freedom degree.

  Next, the operation of the contact device 1 having such a configuration will be described.

  First, when the coil 13 is not energized, the elastic force of the return spring 23 overcomes the elastic force of the contact pressure spring 33, the movable iron core 17 moves away from the fixed iron core 15, and the movable contact 29b is moved. FIGS. 4A and 4B are separated from the fixed contact 35a. At this time, as shown in FIG. 5, the peripheral wall portion (wall portion) 82 of the dust-proof wall (partition wall) 80 is curved (elastically deformed) so that the free end portion 82 a comes into contact with the lower surface of the lower yoke 52. Become.

  When the coil 13 is energized from this OFF state, the movable iron core 17 moves closer to the fixed iron core 15 by being attracted to the fixed iron core 15 against the elastic force of the return spring 23 by electromagnetic force. Along with the movement of the movable iron core 17 to the upper side (the fixed iron core 15 side), the upper yoke 51, the movable contact 29 and the lower yoke 52 attached to the shaft 25 and the shaft 25 are moved upward (the fixed contact 35a side). ) As a result, the movable contact 29b of the movable contact 29 comes into contact with the fixed contact 35a of the fixed terminal 35, and these contacts are electrically connected to each other, and the contact device 1 is turned on. At this time, as shown in FIG. 7, the peripheral wall portion (wall portion) 82 of the dust-proof wall (partition wall) 80 is in a substantially straight state, and the free end portion 82a comes into contact with the lower surface of the lower yoke 52. Since the free end portion 82a follows the movement of the moving body (movable contactor, yoke, etc.), the moving body (movable contactor, yoke, etc.) moves while the free end portion 82a is in contact therewith. It will be. By doing so, it becomes possible to suppress the intrusion of the contact powder into the space S2. As a result, it is possible to suppress the movement of the shaft (drive shaft) 25 from being hindered by the penetration of the contact powder into the space S2.

  As described above, in the present embodiment, the flange portion (pressing portion) 81 pressed by the pressing plate (pressing portion) 49 and the flange portion 81 extend to be contractible in the axial direction (extending direction). The peripheral wall portion (wall portion) 82 constitutes a dust-proof wall (partition wall) 80 that partitions the space S1 in which the contact portion 60 is disposed and the space S2 in which the shaft (drive shaft) 25 of the drive block 2 is accommodated. ing. By doing so, it is not necessary to press-fit the shaft (drive shaft) 25 into the insertion hole 80a of the dust-proof wall (partition wall) 80, and assembling workability can be improved.

  In addition, the shape of the peripheral wall part (wall part) 82 of the dust-proof wall (partition wall) 80 can also be formed in a bellows shape as shown in FIG. Although FIG. 8 illustrates an example in which the iron core rubber 18 is not used, the iron core rubber 18 may be used as in the above embodiment. Moreover, it is possible not to use the iron core rubber 18 in the said embodiment.

  Even with this configuration, the same operations and effects as the above-described embodiment can be achieved.

  Further, as shown in FIG. 9, a thin portion 82 b may be formed on the free end portion 82 a of the peripheral wall portion (wall portion) 82.

  Even with this configuration, the same operations and effects as the above-described embodiment can be achieved. Moreover, by making the free end portion 82a thin, it is possible to improve the adhesion to the moving body, and to further enhance the dustproof effect.

  As shown in FIG. 10, the thin portion 82 b may be formed of a member different from the peripheral wall portion (wall portion) 82. That is, by providing the thin wall portion 82b and the peripheral wall portion (wall portion) 82 separately or by using different materials, the thin wall portion 82b and the peripheral wall portion (wall portion) 82 are separate members. It may be configured.

  Even with this configuration, the same operations and effects as the above-described embodiment can be achieved. Moreover, by making the free end portion 82a thin, it is possible to improve the adhesion to the moving body, and to further enhance the dustproof effect. Furthermore, if it forms with a member different from the surrounding wall part (wall part) 82, it will become possible to improve the shape freedom degree of the dust-proof wall (partition wall) 80, and it can improve a dust-proof effect more. Become.

  Moreover, as shown in FIG. 11, it is also possible to make the dust-proof wall (partition wall) 80 also have the function of an iron core rubber so as to serve as the iron core rubber.

  Even with this configuration, the same operations and effects as the above-described embodiment can be achieved. Further, by integrating the dust-proof wall (partition wall) 80 and the iron core rubber, the number of parts can be reduced, and the assembly workability can be further improved.

  In addition, as shown in FIG. 12, a space S <b> 1 in which the contact portion 60 is disposed and a space S <b> 2 in which the drive shaft 25 of the drive block 2 is accommodated in at least the peripheral wall (wall) 82 of the dust-proof wall (partition wall) 80. You may make it form the communication part 82c which communicates. In FIG. 12, a dust-proof wall (partition wall) 80 in a mesh shape is used for dust-proofing. Although FIG. 12 also illustrates an example in which the iron core rubber 18 is not used, the iron core rubber 18 may be used as in the above embodiment.

  Even with this configuration, the same operations and effects as the above-described embodiment can be achieved. Moreover, since the gas can be moved between the space S1 and the space S2 by forming the communication portion 82c, the resistance acting on the movable iron core 17 is increased by air damping when the contact is opened and closed. Can be suppressed.

  Further, as shown in FIG. 13, the flange portion (pressing portion) 81 is pressed toward the moving body by a pressing plate (pressing portion) 49A, and the free end portion 82a of the peripheral wall portion (wall portion) 82 is pressed against the pressing plate 49 (drive block). You may make it contact | abut to the member of 2 side. Although FIG. 13 also illustrates an example in which the iron core rubber 18 is not used, the iron core rubber 18 may be used as in the above embodiment.

  Even with this configuration, the same operations and effects as the above-described embodiment can be achieved.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made.

  For example, in the above embodiment, the movable contact 29 is surrounded by the upper yoke 51 and the lower yoke 52, but only one of the upper yoke 51 and the lower yoke 52 is provided. Also good. It is also possible not to provide the yoke itself.

  Moreover, the structure shown in the said embodiment and its modification can be combined suitably.

  In addition, movable contacts, fixed terminals, and other detailed specifications (shape, size, layout, etc.) can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Contact apparatus 2 Drive block 3 Contact block 15 Fixed iron core 18 Iron core rubber 25 Shaft (drive shaft)
29 Movable contact 29b Movable contact 35a Fixed contact 60 Contact part 80 Dust barrier (partition wall)
81 Flange (Pressing part)
82 Perimeter wall (wall)
82a Free end 100 Electromagnetic relay

Claims (9)

A contact block having a contact portion formed by a fixed contact and a movable contact contacting and separating from the fixed contact; a drive shaft to which a movable contact having the movable contact is attached; and the movable contact is attached to the fixed contact A drive block that drives the movable contact so as to come in contact with and away from, and a contact device comprising:
A partition wall that partitions a space in which the contact portion is disposed and a space in which the drive shaft of the drive block is accommodated;
The said partition wall has a press part pressed by the pressing part, and a wall part extended from the said press part and shrinkable in the extending direction, The contact device characterized by the above-mentioned.   The contact device according to claim 1, wherein at least the wall portion of the partition wall is formed of rubber.   The contact device according to claim 1, wherein at least the wall portion of the partition wall is made of metal.   The contact device according to claim 1, wherein at least the wall portion of the partition wall is formed of a molding material.   The contact device according to claim 1, wherein a thin wall portion is formed at a free end portion of the wall portion.   The contact device according to claim 5, wherein the thin portion is formed of a member different from the wall portion. The drive block includes a fixed iron core, and an iron core rubber is disposed between the fixed iron core and the pressing portion.
The contact device according to claim 1, wherein the partition wall also serves as the iron core rubber.   2. The partition wall according to claim 1, wherein at least the wall portion includes a communication portion that communicates a space in which the contact portion is disposed and a space in which the drive shaft of the drive block is accommodated. The contact device according to any one of 1 to 7.   An electromagnetic relay, wherein the contact device according to any one of claims 1 to 8 is mounted.

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