JP5924398B2 - Sealed contact device - Google Patents

Description

  The present invention relates to a sealed contact device, and more particularly, to an electromagnetic relay for a power load that can quickly eliminate a generated arc.

Conventionally, as a sealed contact device, for example, a movable shaft 44 that reciprocates in the axial direction based on excitation and demagnetization of a solenoid 20 reciprocates a contact carrying member 28 that has a pair of movable contacts 32 and 32 mounted thereon. Discloses a sealed electromagnetic relay that contacts and separates the movable contact 32 from the fixed contact 34 (see Patent Document 1).
In the sealed electromagnetic relay, a pair of permanent magnets 30 are arranged on the outer peripheral surface of the resin container 26 in order to attract an arc generated between the movable contact 32 and the fixed contact 34.

EP2218086B1 publication

  However, in the electromagnetic relay, when the arc generated between the movable contact 32 and the fixed contact 34 abuts on the inner peripheral surface of the container 26, the container 26 is damaged, and as a result, the permanent magnet 30 is affected by the arc. By heating and quenching, the magnetic characteristics of the permanent magnet 30 are deteriorated. For this reason, there has been a problem that it is impossible to maintain the disappearance of the arc efficiently for a long period of time.

  In view of the above-described problems, an object of the present invention is to provide a sealed contact device that can maintain a function of attracting a generated arc and quickly and surely disappearing for a long period of time.

In order to solve the above problems, a sealed contact device according to the present invention is configured to face a housing, a fixed contact and a movable contact arranged to face each other in the housing, and the fixed contact and the movable contact, respectively. A pair of permanent magnets arranged, and an arc generated between the fixed contact and the movable contact is attracted by a current flowing between the fixed contact and the movable contact and a magnetic force of the permanent magnet. An electromagnetic relay having a cross-section gate-shaped arc shielding member comprising a plate-like connecting body and arm portions formed at both ends of the connecting body at positions where the arc in the housing is attracted, with placing, of the edge of the coupling body and the arm of the arc shielding member, at least one of the edges, receiving at least one arc There as a structure in which a.

  According to the present invention, even when an arc is generated in an arbitrary direction, the arc can be eliminated by attracting it in a desired direction with an electric current and a magnetic force and applying it to the arc shield member. For this reason, deterioration of the magnetic characteristics of not only the housing but also the permanent magnet can be prevented, and the function of quickly and reliably disappearing the arc can be maintained for a long time.

  Further, according to the present invention, even if the direction in which the arc is generated is changed due to the change in current or magnetism, the arc comes into contact with any one arm portion of the arc shielding member and disappears.

According to the present invention , the arc-shaped shield member can be easily grasped by being formed into a gate-shaped cross section, and the mounting work in the internal space is facilitated.

Furthermore, according to the present invention, the arc can easily hit the arc receiving piece, and the arc can be more efficiently eliminated.

As an embodiment of the present invention, the upper rib may extend laterally from at least one of the upper edges of the pair of arms.
According to this embodiment, since the arc generated between the fixed contact and the movable contact hits the upper rib extending from the upper edge of the arm and disappears, the arc is difficult to leak out.

As another embodiment of the present invention, the outer ribs may be extended so as to approach each other from the outer edges of the pair of arms.
According to the present embodiment, it is possible to prevent the arc from hitting the permanent magnet without hindering the opening / closing operation of the fixed contact and the movable contact, and it is possible to prevent the deterioration of the magnetic characteristics of the permanent magnet.

As another embodiment of the present invention, a partition wall having a magnetic flux hole may be bridged between the outer edges of the pair of arms.
According to this embodiment, the arc can be effectively eliminated while securing the mechanical strength of the arc shielding member.

As a different embodiment of the present invention, a partition wall having a notch may be bridged between the outer edges of the pair of arms.
According to this embodiment, the arc can be effectively eliminated while securing the mechanical strength of the arc shielding member.

As another embodiment of the present invention, a partition wall having at least one slit may be bridged between the outer edges of the pair of arms.
According to this embodiment, there is an effect that the arc can be efficiently eliminated while ensuring the mechanical strength of the arc shielding member.

Drawing A and B are the whole perspective views which looked at the embodiment of the sealed contact device concerning the present invention from a different angle. It is front sectional drawing before operation | movement of the sealing contact apparatus shown in FIG. It is side surface sectional drawing before operation | movement of the sealing contact apparatus shown in FIG. FIG. A is a schematic perspective view for explaining a method of extinguishing an arc, and FIG. B is a partial plan sectional view of a sealed contact device. FIGS. A and B are a partial front sectional view and a partial side sectional view of a sealed contact device for explaining a method of extinguishing an arc. FIG. 1B is an exploded perspective view of the sealed contact device shown in FIG. 1A. It is a disassembled perspective view of the sealing contact apparatus shown in FIG. 1B. FIGS. A and B are perspective views of the metal cylindrical flange and the first yoke shown in FIG. FIGS. A and B are a perspective view and a partially enlarged sectional view of the metal cylindrical flange shown in FIG. 6 as seen from different angles. FIG. A is a perspective view of the arc shielding member shown in FIG. 1, and FIGS. B and C are perspective views of the arc shielding member according to the second and third embodiments. FIGS. A, B, and C are perspective views of arc shielding members according to fourth, fifth, and sixth embodiments. FIGS. A, B, and C are perspective views of arc shielding members according to seventh, eighth, and ninth embodiments.

An embodiment in which a sealed contact device according to the present invention is applied to a sealed electromagnetic relay will be described with reference to the accompanying drawings of FIGS.
The sealed electromagnetic relay according to the first embodiment includes a contact mechanism unit 30 in a housing formed by assembling a cover 20 to a case 10 as shown in FIGS. An electromagnet unit 50 that drives the contact mechanism unit 30 from outside the sealed space 43 is accommodated. The contact mechanism unit 30 is incorporated in a sealed space 43 including a ceramic plate 31, a metal cylindrical flange 32, a plate-shaped first yoke 37, and a bottomed cylindrical body 41.

  The case 10 is a substantially box-shaped resin molded product. The case 10 is provided with a mounting hole 11 into which a mounting bracket 11a is press-fitted in a lower corner portion of an outer side surface, and a bulge for drawing out a lead wire (not shown) at a corner portion of the side surface. A protruding portion 12 is formed, and a locking hole 13 is provided at the opening edge of the opposite side surface.

  The cover 20 has a planar shape capable of covering the opening of the case 10 and is provided with terminal holes 22 and 22 on both sides of a partition wall 21 projecting from the center of the upper surface thereof. Further, the cover 20 is provided with a protruding portion 23 on one side surface thereof that can prevent so-called fluttering of a lead wire (not shown) by being inserted into the bulging portion 12 of the case 10. Further, the cover 20 is provided with a locking claw 24 that can be locked in the locking hole 13 of the case 10 at the opening edge of the opposite side surface.

  The contact mechanism 30 is disposed in the sealed space 43 (see FIG. 2) formed by the ceramic plate 31, the metal cylindrical flange 32, the plate-shaped first yoke 37, and the bottomed cylindrical body 41 as described above. The magnet holder 35, the cylindrical fixed iron core 38, the movable iron core 42, the movable shaft 45, and the movable contact piece 48 are included.

  The ceramic plate 31 has a planar shape that can be brazed to an upper opening edge of a metal cylindrical flange 32 to be described later, is provided with a pair of terminal holes 31a, 31a, and is used in combination with an auxiliary plate 31c. The ceramic plate 31 has a metal layer (not shown) formed on the outer peripheral edge of the upper surface and the opening edge of the terminal hole 31a. Then, as shown in FIG. 6, the fixed contact terminal 33 having the fixed contact 33 a fixed to the lower end portion is brazed into the terminal hole 31 a of the ceramic plate 31.

As shown in FIG. 8, the metal cylindrical flange 32 welded and integrated with the outer peripheral edge of the upper surface of the ceramic plate 31 has a substantially cylindrical shape formed by pressing a metal plate. In particular, the metallic cylindrical flange 32 has an annular flange 32a extending laterally from a lower opening edge thereof, and a notch 32b is formed at a corner of the annular flange 32a. Further, as shown in FIG. 9, the metallic cylindrical flange 32 is formed by punching the annular protrusion 32c twice from the left and right along the lower surface of the annular flange 32a. The annular protrusion 32c may be formed by protruding processing.
And the said metal cylindrical flange 32 is integrated by resistance welding to the upper surface of the plate-shaped 1st yoke 37 mentioned later via the annular protrusion 32c provided in the said annular collar part 32a. However, since the annular protrusion 32c is formed at a position separated so as not to contact the notch, there is no possibility of poor welding during resistance welding.

  The magnet holder 35 housed in the metal cylindrical flange 32 is made of a heat-resistant insulating material having a box shape, and has pocket grooves 35a that can hold the permanent magnets 36 on the opposite outer side surfaces thereof. is there. Further, the magnet holder 35 is provided with an annular cradle 35c (see FIG. 2) at the center of the bottom thereof, and a cylindrical insulating portion 35b is projected downward from the center of the annular cradle 35c. Even if the arc is generated and the high voltage is generated in the path of the metal cylindrical flange 32, the plate-shaped first yoke 37, and the cylindrical fixed iron core 38, the cylindrical insulating portion 35b is connected to the cylindrical fixed iron core 38. Insulating the movable shaft 45 prevents welding and integration of both. Further, a positioning plate 26 disposed so as to face the inside of the magnet holder 35 is disposed so as to abut on the movable contact piece 48, and the movable contact piece 48 is prevented from rotating and positioned. A pair of rubber plates 27 is disposed between the magnet holder 35 and the first yoke 37, and when the fixed contact 33a and the movable contact 48a are separated from each other, the gap between the magnet holder 35 and the annular flange 45a. Shock that occurs is buffered.

  In addition, an arc shield member 61 according to the first embodiment of the present invention is disposed inside the magnet holder 35. The arc shielding member 61 is made of, for example, a metal such as stainless steel, and has a substantially U-shaped cross section as shown in FIG. 10A.

  That is, as shown in FIG. 10A, the arc shield member 61 includes a plate-like connecting body 62 and arm portions 63 formed by bending both ends of the connecting body 62 upward. A positioning tongue piece (arc receiving piece) 64 cut and raised upward is formed on each of the opposing edges of the coupling body 62. The arm portion 63 has an inner rib (arc receiving piece) 65 formed by bending both side edge portions toward the connecting body 62 and an outer rib (arc receiving piece) 66. A space for allowing the magnetic flux of the permanent magnet 36 to pass is formed between the pair of outer ribs 66, 66. As shown in FIG. 2, the arc shield member 61 has the connecting body 62 placed on the bottom wall of the magnet holder 35 and the arm portion 63 on the opposite side wall of the magnet holder 35 as shown in FIG. 4B. Fixed.

  As shown in FIG. 6, the plate-shaped first yoke 37 has a planar shape that can be fitted to the opening edge of the case 10. 37b is provided. Further, as shown in FIG. 8B, positioning protrusions 37c are provided on both sides of the caulking hole 37b. The plate-shaped first yoke 37 has an upper end portion of the cylindrical fixed iron core 38 that is caulked and fixed to the caulking hole 37b, and an annular protrusion 32c provided on the annular flange portion 32a of the metal cylindrical flange 32. Are integrated by resistance welding.

  As shown in FIG. 2, the cylindrical fixed iron core 38 is slidably inserted into its through-hole through the cylindrical insulating portion 35b of the magnet holder 35 so that the movable shaft 45 provided with the annular flange 45a is slidable. It is. The movable shaft 45 has a return spring 39 inserted therein, and a movable iron core 42 fixed to the lower end thereof by welding.

  The bottomed cylindrical body 41 that houses the movable iron core 42 is hermetically joined to the lower surface edge portion of the caulking hole 37b provided in the plate-shaped first yoke 37 at the opening edge portion. The sealed space 43 is formed by sucking and sealing the internal air from the gas vent pipe 34.

  As shown in FIG. 2, the movable shaft 45 engages a plate-shaped receiving member 46 with an annular flange 45a provided at an intermediate portion thereof, and prevents the inserted contact spring 47 and movable contact piece 48 from falling off. A retaining ring 49 is fixed to the upper end of the ring. And the movable contact 48a provided in the upper surface both ends of the said movable contact piece 48 is facing the fixed contact 33a of the fixed contact terminal 33 arrange | positioned in the said metal cylindrical flange 32 so that contact / separation is possible.

  As shown in FIG. 2, the electromagnet portion 50 press-fits and fixes coil terminals 53 and 54 to a flange 52 a of a spool 52 around which the coil 51 is wound, and the coil 51 via the coil terminals 53 and 54. Are connected to lead wires (not shown). The bottomed cylindrical body 41 is inserted into the through hole 52 b of the spool 52 and fitted into the fitting hole 56 a of the second yoke 56. Next, the electromagnets are engaged by engaging the upper ends of both side portions 57, 57 of the second yoke 56 with both ends of the plate-like first yoke 37 and fixing them by means such as caulking, press-fitting or welding. The part 50 and the contact mechanism part 30 are integrated.

Next, the operation of the sealed electromagnetic relay having the above-described configuration will be described.
First, as shown in FIG. 2, when no voltage is applied to the coil 51, the movable iron core 42 is urged downward by the spring force of the return spring 39, and the movable shaft 45 is pushed downward. The movable contact piece 48 is pulled downward. At this time, the annular flange 45a of the movable shaft 45 is engaged with the annular cradle 35c of the magnet holder 35, and the movable contact 48a is separated from the fixed contact 33a. It is not in contact with the bottom.

  Next, when a voltage is applied to the coil 51 to excite it, the movable iron core 42 is attracted to the cylindrical fixed iron core 38, and the movable shaft 45 slides upward against the spring force of the return spring 39. Even after the movable contact 48a contacts the fixed contact 33a, the movable shaft 45 is pushed up against the spring force of the return spring 39 and the contact spring 47, and the upper end of the movable shaft 45 is the shaft hole of the movable contact piece 48. It protrudes from 48b, and the movable iron core 42 is adsorbed to the cylindrical fixed iron core 38.

  When the application of the voltage to the coil 51 is stopped and the excitation is released, the movable iron core 42 is separated from the cylindrical fixed iron core 38 based on the spring force of the contact spring 47 and the return spring 39. Therefore, after the movable shaft 45 slides downward and the movable contact 48a is separated from the fixed contact 33a, the annular flange 45a of the movable shaft 45 engages with the annular cradle 35c of the magnet holder 35, and the original Return to the state.

At this time, an arc may occur between the high voltage fixed contact 33a and the movable contact 48a. This arc is attracted according to Fleming's left-hand rule by the current flowing between the fixed contact 33a and the movable contact 48a and the magnetic force generated horizontally between the opposing permanent magnets 36 in FIG. 4A. The
For example, a current (black arrow) flows from the movable contact 48a toward the fixed contact 33a (from the lower side to the upper side of the paper), and the magnetic force (long and thin white arrow) of the permanent magnet 36 is perpendicular to the current (paper surface). Is applied to the direction perpendicular to the current and magnetic force (from the back side to the front side of the paper) based on Fleming's left-hand rule.
In general, the direction of the magnetic force is curved in an arc as the distance from the central axis of the opposing permanent magnet 36 increases. Further, due to the current and the magnetic force, a current also flows in the attracted arc, and the direction in which the arc current flows is curved to move from the movable contact 48a toward the fixed contact 33a. Considering these factors, the arc generated between the fixed contact 33a and the movable contact 48a is attracted to approach the permanent magnet 36 as the distance from the contact increases.
Therefore, the arm portion 63 of the arc shielding member 61 is installed in the direction in which the arc is first attracted (direction perpendicular to the current and magnetic force), and the generated arc is further attracted (permanent magnet 36). The outer rib 66 is provided so as to cover a part of the permanent magnet 36 in a direction (approaching the center of the permanent magnet 36) (however, a space is provided so as not to cover the central axis of the permanent magnet 36). For this reason, even when the direction of the current flowing between the fixed contact 33a and the movable contact 48a is switched, the arc attracted by the magnetic force generated in the horizontal direction between the opposing permanent magnets 36 is prevented from being shielded by the arc. It can be eliminated by hitting the member 61.
Further, since the arc shielding member 61 prevents the arc from directly hitting the magnet holder 35, the permanent magnet 36 can be prevented from being deteriorated due to the breakage of the magnet holder 35.

  In particular, since the arc shield member 61 has the inner rib 65 and the outer rib 66 on both side edges of the arm portion 63, the generated arc can be enclosed and the arc can be effectively eliminated. .

  Further, the arc shield member 61 is formed in a cross-sectional gate shape, and a coupling body (base portion) 62 is placed on the bottom surface in the magnet holder 35 in the sealed space 43 (magnet holder 35). For this reason, compared with the case where it forms in simple plate shape, it becomes easy to hold | grip the shield member 61 for arc, and the workability | operativity of attachment to the sealed space 43 (magnet holder 35) improves. Moreover, the mounting property of the arc shield member 61 in the sealed space 43 can be secured without hindering the opening / closing operation of the fixed contact 33a and the movable contact 48a.

  Further, the arm portion 63 of the arc shield member 61 is disposed on both sides of the fixed contact 33 a and the movable contact 48 a and along the opposing surface of the permanent magnet 36. For this reason, even if the direction of electric current or magnetic flux changes and the direction of arc generation changes, the arc can be applied to one of the arm portions 63 and disappear.

  Since the arc shielding member 61 is made of metal, it has a high ability to efficiently cool and eliminate the arc hitting the arc shielding member 61.

(Second Embodiment)
FIG. 10B shows an arc shielding member 61 according to the second embodiment of the present invention.
The arc shield member 61 according to the second embodiment is formed with an inner rib 65 larger than the inner rib of the first embodiment on the arm portion 63 thereof. As a result, when the generated arc enters the arm portion 63, the arc can be more reliably enclosed and eliminated. Others are the same as those in the first embodiment described above, and the same parts are denoted by the same reference numerals and description thereof is omitted.

(Third embodiment)
FIG. 10C shows an arc shielding member 61 according to the third embodiment of the present invention.
The difference from the first embodiment is that an upper rib 67 extending from the upper end portion of the arm portion 63 is bent toward the connecting body 62 side.
According to the present embodiment, when the generated arc enters the arm portion 63, the arc can be reliably enclosed and effectively lost. Others are the same as those in the first embodiment described above, and the same parts are denoted by the same reference numerals and description thereof is omitted.

(Fourth embodiment)
FIG. 11A shows an arc shielding member 61 according to a fourth embodiment of the present invention.
The difference from the first embodiment is that a partition wall 68 is formed so as to span the pair of arm portions 63, 63, and a magnetic flux hole 68 a is provided so that magnetic flux can pass through the partition wall 68.
According to the present embodiment, there is an advantage that the arc shield member 61 that has high mechanical strength and does not reliably blow the arc to the permanent magnet side can be obtained. Others are the same as those in the first embodiment described above, and the same parts are denoted by the same reference numerals and description thereof is omitted.

(5th and 6th embodiment)
11B and 11C show arc shielding members 61 according to fifth and sixth embodiments of the present invention.
The arc shield member 61 according to the fifth embodiment is provided with an inner rib 65 at the inner edge of the arm 63 and a partition wall 68 having a magnetic flux hole 68a at the outer edge. . Further, the arc shield member 61 according to the sixth embodiment is provided with an inner rib 65 reaching the connecting body 62 at the inner edge portion of the arm portion 63, and a magnetic flux hole 68 a at the outer edge portion. A partition wall 68 is provided. Each of the fifth and sixth embodiments has an advantage that the mechanical strength is high and the arc is not reliably blown to the permanent magnet side. Others are the same as those in the first embodiment described above, and the same parts are denoted by the same reference numerals and description thereof is omitted.

(Seventh embodiment)
FIG. 12A shows an arc shielding member 61 according to a seventh embodiment of the present invention.
The arc shield member 61 according to the seventh embodiment has inner ribs 65 and 65 formed on the inner edges of the arms 63 and 63, respectively, and is cut on the outer edges of the arms 63 and 63. This is a case where the partition wall 68 provided with the notch 68b is bridged.
According to the seventh embodiment, it is possible to obtain the arc shield member 61 having high mechanical strength, capable of eliminating the arc, and having a high material yield. Others are the same as those in the first embodiment described above, and the same parts are denoted by the same reference numerals and description thereof is omitted.

(Eighth embodiment)
FIG. 12B shows an arc shielding member 61 according to the eighth embodiment of the present invention.
The arc shield member 61 according to the eighth embodiment is formed with inner ribs 65, 65 at the inner edges of the arms 63, 63, respectively, and is partitioned at the outer edges of the arms 63, 63. A wall 68 is bridged. The partition wall 68 is provided with a plurality of slits 68c extending sideways.
According to the present embodiment, the magnetic flux of the permanent magnet can pass through the plurality of slits 68c provided in the partition wall 68, the arc can be reliably prevented from being stretched, and the arc can be reliably lost. Others are the same as those in the first embodiment described above, and the same parts are denoted by the same reference numerals and description thereof is omitted.

(Ninth embodiment)
FIG. 12C shows an arc shielding member 61 according to the ninth embodiment of the present invention.
The arc shield member 61 according to the ninth embodiment is formed with inner ribs 65, 65 on the inner edges of the arms 63, 63, respectively, and is partitioned on the outer edges of the arms 63, 63. A wall 69 is bridged. The partition wall 69 has a lower end edge away from the connecting body 62 and a magnetic flux hole 69a so that positioning tongues 64 and 64 can be formed on both side edges of the connecting body 62, respectively. .
According to the present embodiment, it is possible to obtain the arc shield member 61 that is easy to position and secures high mechanical strength while ensuring mechanical strength. Others are the same as those in the first embodiment described above, and the same parts are denoted by the same reference numerals and description thereof is omitted.

The distance between the outer ribs 66, 66, the width dimension of the magnetic flux holes 68a, 69a, the width dimension of the notch 68b, and the width dimension of the slit 68c are preferably at least equal to or larger than the contact diameter. . This is for facilitating the passage of the magnetic flux that induces the arc and ensuring a desired attractive force.
Further, the height dimension of the magnetic flux holes 68a and 69a and the height dimension of the slit 68c are preferably at least the distance between the contacts. Even if the height dimension of one slit 68c is smaller than the distance between the contacts, the sum of the height dimensions of the plurality of slits 68c may be equal to or greater than the distance between the contacts. This is for facilitating the passage of the magnetic flux that induces the arc and ensuring a desired attractive force.

  Of course, the sealed contact device according to the present invention is not limited to the above-described sealed electromagnetic relay but may be applied to other electromagnetic switches.

10 Case (housing)
20 Cover (housing)
32 Metal cylindrical flange 32a Annular flange 32b Notch 32c Annular projection 33a Fixed contact 36 Permanent magnet 37 Plated first yoke 37a Elastic plate 37b Caulking hole 37c Positioning projection 43 Sealing space 48a Movable contact 61 Arc shield member 62 Connected body (base)
63 arms 64 tongue (arc receiving piece)
65 Inner rib (arc receiving piece)
66 Outer rib (arc receiving piece)
67 Upper rib (arc receiving piece)
68 Partition wall (arc receiving piece)
68a Magnetic flux hole 68b Notch 68c Slit 69 Partition wall (arc receiving piece)
69a Magnetic flux hole

Claims (6)

A housing, a fixed contact and a movable contact arranged to face each other in the housing, and a pair of permanent magnets arranged to face the fixed contact and the movable contact, respectively.
An electromagnetic relay that induces an arc generated between the fixed contact and the movable contact by a current flowing between the fixed contact and the movable contact and a magnetic force of the permanent magnet,
In the position where the arc in the housing is attracted, a cross-sectional gate-shaped arc shielding member consisting of a plate-like coupling body and arm portions formed at both ends of the coupling body, respectively ,
A sealed contact device , wherein at least one arc receiving piece is provided on at least one of the connecting member of the arc shielding member and the edge of the arm . 2. The sealed contact device according to claim 1 , wherein an upper rib extends laterally from at least one of the upper edge portions of the pair of arm portions. 3. The sealed contact device according to claim 1 , wherein outer ribs extend so as to approach each other from outer edges of the pair of arms. The sealed contact device according to claim 1 , wherein a partition wall having a magnetic flux hole is bridged between outer edges of the pair of arms. 3. The sealed contact device according to claim 1 , wherein a partition wall having a notch portion is bridged between outer edges of the pair of arms. The sealed contact device according to claim 1, wherein a partition wall having at least one slit is bridged between outer edges of the pair of arms.

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