JP5953091B2 - Latching relay - Google Patents

Description

  The present invention relates to a latching relay suitable for a switch used in a watt-hour meter.

  A latching relay is a power-saving relay that requires power only during an opening / closing operation and does not require power to maintain an open state and a closed state. For example, a latching relay disclosed in Patent Document 1 includes an engagement member that includes a driver that rotates a leaf spring to which a movable contact is attached by the generation of magnetic force of an electromagnet. Engage with the spring to open and close.

  In addition, in Patent Document 2, in order to suppress contact bounce in a similar relay, the drive element has a leaf spring on the tip side from the position where the movable contact of the leaf spring is attached, in addition to the engagement member described above. It has the 2nd engaging member to hook.

  Further, unlike the above-mentioned type, Patent Document 3 discloses that the drive element operates as a seesaw by the magnetic force of an electromagnet, is integrated with the drive element and arranged on substantially the same plane, and the arm of the seesaw is located near the fulcrum of the drive element. A relay that opens and closes a movable contact and a fixed contact that is fixed to a pedestal surface that supports a seesaw type driver is disclosed.

  In addition, with the demand for downsizing of electrical equipment, downsizing is also required for the relay built in the equipment and controlling the opening and closing thereof. In general, an electromagnet is used to drive a relay. However, in order to reduce the size of a relay, it is necessary to reduce the size of an electromagnet that occupies a large volume, and it is necessary to open and close it for a predetermined distance with a small force. Become. The opening / closing operation requires a large driving force when welding occurs.

JP-A-4-33227 JP-A-6-103876 JP-A-10-214552

  However, as in the relay of Patent Document 1, when the opening and closing operation is performed by the driver engaging the leaf spring between the movable contact and the terminal, the force that pulls the welded portion closer to the contact side. Become stronger. However, the amount of deflection of the leaf spring for applying the contact pressure necessary to make the contact resistance not more than a predetermined value at the time of closing becomes small and adjustment becomes difficult. If the contact pressure of the latching relay is too small, contact resistance is caused. On the other hand, if the contact pressure is too large, the holding force in the open / close state is reduced. For this reason, if the contact pressure cannot be adjusted to an appropriate value, the contact resistance characteristics and the holding force vary and the stability is impaired.

  In patent document 2, in order to suppress the bounce that causes the occurrence of welding, a second engaging member that hooks the leaf spring on the tip side from the position where the movable contact of the leaf spring is attached is provided. However, even if bounce can be suppressed in a state where the number of times of opening and closing is small, the shape of the contact is deformed along with opening and closing, so that the frequency of bounce occurrence increases as the number of times of opening and closing increases. Therefore, a method for separating the welded portion is necessary.

  The relay of Patent Document 3 has a configuration in which a member integrated with a driving body is extended in a direction parallel to the leaf spring on the movable contact side of the leaf spring, and when the welding occurs, the extension portion contacts the leaf spring. By shortening the effective spring length of the leaf spring, the welding pull-out force is increased.

  However, in such a configuration, the distance between the fixed portion of the leaf spring and the leaf spring contact portion at the distal end of the extension portion is large, and the extension portion itself bends, so that the displacement of the driver that completes the welding removal is small. It becomes large and cannot be used for relays with a short driving distance.

  In addition to Patent Document 3, JP-A-6-111702 and JP-A-10-261356 describe similar relays, but these seesaw type relays have an interval between a driver armature and a leaf spring. Is not suitable for relays of 10A or more, which are narrow and cause significant arc discharge.

  An object of the present invention is to provide a latching relay that can improve the welding / detaching force without impairing the contact resistance characteristic and the opening / closing holding force, and can be applied to a current region of 10 A or more with a small driving force.

In order to solve the above-described problems, a latching relay according to the present invention includes an electromagnet having a coil and a yoke, a leaf spring, a movable contact attached near the tip of the leaf spring, and the movable contact. A fixed contact, a movable terminal connected to the leaf spring, a fixed terminal connected to the fixed contact, and the movable terminal and the movable contact are disposed between and sandwiched by the leaf spring. A mating engagement member, an armature that contacts and separates the yoke of the electromagnet, a permanent magnet disposed between the armatures, and the engagement member, the armature, and the permanent magnet are integrally rotated. axis is rotated by the action of the electromagnet in the center and a driving element for holding the armature by the magnetic force of the permanent magnet to the open state position and closed position, is formed integrally with the engaging member, said engaging To sandwich the leaf spring with the member Is location, the engagement member is more disposed to said movable contact side, and having an opening assisting member pushes the plate spring when opening the opening direction.

  In the present invention, since the opening assisting member is provided at a position near the movable contact in addition to the engaging member, the contact pressure can be easily adjusted, the welding pull-out force can be improved, and the open / closed state can be maintained. It is possible to provide a latching relay that is excellent in stability of force and contact resistance value and excellent in open / close life characteristics.

In addition, since the opening assisting member and the engaging member are integrally formed and the opening assisting member is arranged so as to sandwich the leaf spring with the engaging member , the mutual positional relationship can be accurately determined, If the contact cannot be instantaneously opened due to slight welding, the movable contact spring bends toward the opening assisting member and the two contact each other. be able to.

It is the front view and side view of the latching relay which concern on Example 1. FIG. (A) The figure which shows the closing state of the latching relay which concerns on Example 1, (b) is the figure which shows the opening state of the latching relay which concerns on Example 1, (c) is the Example in which slight welding generate | occur | produced FIG. 3 is a diagram showing a contact opening operation by a contact opening assisting member of the latching relay according to FIG. It is the front and side view of the conventional latching relay of the comparative example 1. It is a figure which shows the opening operation by the engaging member of the comparative example 1 in which slight welding generate | occur | produced. It is the front and side view of the latching relay of the comparative example 2. It is a figure which shows the relationship between the welding tripping force of a latching relay of Example 1 and Comparative Example 1, and a driver element rotation angle. It is a figure which shows the relationship between the deflection amount which the engaging member of Example 1 and Comparative Example 2 gives to a leaf | plate spring, and contact pressure. It is a figure which shows the relationship between the deflection amount which the engagement member of Example 1 and Comparative Example 2 gives to a leaf | plate spring, and contact resistance. It is the front view and side view of the latching relay of Example 2. It is the front view and side view of a latching relay of Example 3.

  Hereinafter, a latching relay according to an embodiment of the present invention will be described in detail with reference to the drawings.

  1 is a front view (FIG. 1 (a)) and a side view (FIG. 1 (b)) of a main circuit portion of a latching relay according to a first embodiment of the present invention and a drive portion engaged therewith.

  The latching relay shown in FIG. 1 includes an electromagnet 1 having a coil 1 a and a yoke 1 b made of a magnetic material, a leaf spring 2, a movable contact 3 attached in the vicinity of the tip of the leaf spring 2, and a contact with and separation from the movable contact 3. The fixed contact 4 to be moved, the movable contact 5 connected to the movable contact 3 and the leaf spring 2, the fixed contact 6 connected to the fixed contact 4, and the position between the movable contact 5 and the movable contact 3. The engaging members 7a and 7b engaged with the leaf spring 2 by hooking or sandwiching them, the armature 8 contacting and separating from the yoke 1b of the electromagnet 1, and the permanent magnet 9 disposed between the armatures 8 are engaged. The members 7a and 7b, the armature 8 and the permanent magnet 9 are integrated and rotated around the rotation shaft 10a by the action of the electromagnet 1, and the armature 8 is moved to the open and closed positions by the magnetic force of the permanent magnet 9. It is formed integrally with the holding element 10 to be held and the engaging members 7a and 7b. Engaging member 7a, it is arranged between the fixed contact and the movable contact 3 of the movable contact 3 side 4 from 7b, and an opening assisting member 11 to press the plate spring 2 in the opening direction during opening.

  The plate spring 2 is, for example, 25 mm from the plate spring fixed end 2a to the plate spring tip. The plate spring 2 has a movable contact 3 attached at a position 21 mm from the plate spring fixed end 2a. The leaf spring 2 is inserted into a slit between the engagement member 7a and the engagement member 7b at a position 16 mm from the leaf spring fixed end 2a.

  Further, the opening assisting member 11 is disposed at a position closer to the movable contact 3 by 2 mm than the engaging members 7a and 7b. The distance between the contacts at the time of opening is 1 mm. As shown in FIG. 2A, in the closed state, the engaging member 7a deflects the leaf spring 2 in the closing direction to apply a contact pressure to the movable contact 3.

  As a result of measuring the contact resistance in the initial state of 10 latching relays of the same shape, it was confirmed that the contact resistance was less than the maximum permissible value. As for the holding force in the open / closed state, as a result of investigating with a spring impact hammer, it was confirmed that the open / closed state could be held even when all the members gave a predetermined impact.

  On the other hand, as shown in FIG. 2 (b), in the open state, the engaging portion 7 b pushes the leaf spring 2 in the opening direction, so that the movable contact 3 is instantaneously opened from the fixed contact 4.

  However, even when the movable contact 3 and the fixed contact 2 cannot be instantaneously opened due to slight welding, the leaf spring 2 is deformed to the opening assisting member 11 by bending the leaf spring 2 as shown in FIG. In order to make contact, the opening assisting member 11 pushes the leaf spring 2 and pulls the welded portion to open the contact. Although this latching relay was opened and closed 10,000 times under the condition of 200V-60A, the occurrence of switching problems due to welding has never occurred.

  Further, in order to give the opening assisting member 11 the above function, the engaging portion 7b and the opening assisting member 11 are arranged so that the positions of the surfaces on the leaf spring side are substantially the same. The positional relationship in the direction perpendicular to the leaf spring surface of the opening assisting member 11 and the engaging member 7b for realizing the functions is the fixed position of the movable contact 3, the contact position, and the engaging member 7a with the driver 10. It is determined by the mutual relationship between the positions of 7b.

  Further, since the engaging members 7a and 7b and the opening assisting member 11 are integrally formed, the mutual positional relationship can be accurately determined.

(Comparative Example 1)
3 is a front view and a side view of a conventional latching relay of Comparative Example 1. FIG. In Comparative Example 1, there is no opening assisting member 11 as shown in Example 1, and other configurations are the same as those in Example 1.

  As a result of measuring the contact resistance in the initial state of 10 latching relays of the same shape, it was confirmed that the total number was less than the maximum allowable value. In addition, as with the first embodiment, the open / close holding force was able to hold the open / closed state even when all of them gave a predetermined impact.

  However, this latching relay was similarly opened and closed 10,000 times under the condition of 200V-60A. However, even if the driver 10 moves to the open position when slight welding occurs at the contacts, As shown, the movable contact 3 and the fixed contact 2 are in a welded state. That is, the welded portion cannot be removed, the first opening / closing failure occurs at the 7457th time, and then 14 failures by the 10,000th time.

(Comparative Example 2)
5 is a front and side view of the latching relay of Comparative Example 2. FIG. That is, in Comparative Example 2 shown in FIG. 5, the engaging members 7a and 7b of the conventional latching relay of Comparative Example 1 are moved toward the movable contact 3, and the engaging member 7b is positioned at the position of the opening assisting member 11 of Example 1. Moved so as to match.

  As in Example 1, there was no failure due to welding after opening and closing 10,000 times, but as a result of measuring the contact resistance in the initial state of 10 latching relays of the same shape, 2 were more than the maximum allowable value. More than the contact resistance. In addition, another one of them was reversed in the open / closed state by a predetermined impact of the spring impact hammer.

  Next, the operation of the latching relay according to the first embodiment configured as described above will be described. In the relays of the type of Example 1 and Comparative Examples 1 and 2, when the movable contact 3 is welded, as shown in FIG. 6, the spring force corresponding to the driving amount (driving element rotation angle) of the driving element 10 ( The movable contact 3 can be pulled off with a welding pull-off force.

  However, since the driving amount of the driver 10 is determined by the distance between the contacts, the spring force for loosening / removing is a value corresponding to the driving amount determined by the distance between the contacts. For this reason, there is a risk that the force required for tripping a relatively large scale of welding that occurs with a certain probability exceeds this maximum welding tripping force and an open / close failure occurs.

  The dotted line shown in FIG. 6 indicates the welding tear-off force of Comparative Example 1 that does not use the opening assisting member 11. In the latching relay of the first embodiment, the opening assisting member 11 is provided at a position near the movable contact, and the welding pull-out force can be increased up to 1.5 times that of the first comparative example as shown by the solid line in FIG. The risk of welding defects can be reduced.

  Further, in Comparative Example 2, when the engaging members 7a and 7b are simply moved closer to the movable contact side, the change in the contact pressure with respect to the change in the deflection amount of the leaf spring 2 at the time of closing is performed as shown in FIG. Compared to Example 1.

  Since the contact pressure needs to be a certain ratio or less with respect to the magnetic force of the permanent magnet 9 from the viewpoint of securing the holding force at the time of opening and closing, the maximum allowable value of the deflection amount is smaller in Comparative Example 2. . On the other hand, since the contact resistance needs to be a predetermined value or less, the minimum allowable value of the deflection is determined as shown in FIG. 8, but the allowable range of the deflection is as shown in FIG. It becomes narrower than Example 1.

  Therefore, as in the first embodiment, the engaging members 7a and 7b that deflect the leaf spring 3 at the time of closing are positioned away from the movable contact 3, and apart from this, opening is performed at a position close to the movable contact 3. By providing the auxiliary member 11, the allowable range of deflection can be widened.

  Thus, according to the latching relay of Example 1, since the opening assisting member 11 is provided at a position near the movable contact 3 separately from the engaging members 7a and 7b, the contact pressure can be easily adjusted. It is possible to provide a latching relay that can improve the welding pull-off force, has excellent holding force in the open / closed state and stability of the contact resistance value, and has excellent open / close life characteristics.

  Further, since the opening assisting member 11 and the engaging members 7a and 7b are integrally formed, the mutual positional relationship can be accurately determined, and if the contact cannot be instantaneously opened by slight welding, the movable contact Since 3 is bent toward the opening assisting member 11 and both come into contact with each other, the opening assisting member 11 can push out the movable contact 3 to increase the welding pull-off force.

  FIG. 9 is a front view and a side view of the latching relay of the second embodiment. In the first embodiment, the leaf spring 2 is sandwiched between the engaging member 7a and the engaging member 7b and engaged with the driver 10. However, in the second embodiment shown in FIG. 9, the engaging member 7a and the opening are engaged. The leaf spring 2 is hooked by the auxiliary member 11 and engaged with the driver 10.

  In the latching relay of the second embodiment, the opening assisting member 11 is provided at a position closer to the movable contact 3 by 2 mm than the engaging member 7a. As this distance is increased, the welding pull-out force can be increased. .

  FIG. 10 is a front view and a side view of the latching relay of the third embodiment. As shown in FIG. 10, the configuration of the latching relay of the first embodiment is characterized in that a braided conductor 12 is additionally provided in parallel with the leaf spring 2. Both ends of the braided conductor 12 are attached to both ends of the leaf spring 2.

  By providing the braided conductor 12 together with the energization path other than the leaf spring 2, the leaf spring 2 can be made thinner and the contact pressure can be easily adjusted.

  In addition, this invention is not limited to the latching relay of Example 1-3. In the latching relays of the first to third embodiments, the driver element 10 has a triangular shape. However, for example, the driver element 10 may be formed in a substantially L shape.

1 electromagnet 1a coil 1b yoke 2 leaf spring 2a leaf spring fixed end 3 movable contact 4 fixed contact 5 movable side terminal 6 fixed side terminal 7 engagement member 7a upper engagement member 7b lower engagement member 8 armature 9 permanent magnet 10 drive Child 10a Driver rotating shaft 11 Opening auxiliary member 12 Braided conductor

Claims (2)

An electromagnet having a coil and a yoke;
Leaf springs,
A movable contact attached near the tip of the leaf spring;
A fixed contact contacting and moving away from the movable contact;
A movable terminal connected to the leaf spring;
A fixed terminal connected to the fixed contact;
An engaging member that is disposed between the movable terminal and the movable contact and engages with the leaf spring interposed therebetween;
An armature that contacts and separates the yoke of the electromagnet;
A permanent magnet disposed between the armatures;
The engaging member, the armature, and the permanent magnet are integrated and rotated about the rotation axis by the action of the electromagnet, and the armature is held in the open position and the closed position by the magnetic force of the permanent magnet. A driving element to
It is formed integrally with the engaging member, and is disposed so as to sandwich the leaf spring with the engaging member, and is disposed on the movable contact side with respect to the engaging member. An opening assisting member to be pressed;
A latching relay comprising:   2. The latching relay according to claim 1, further comprising a braided conductor provided in parallel with the leaf spring and having both end portions attached to both end portions of the leaf spring.

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