JP7170508B2 - electromagnetic relay - Google Patents

Description

The present invention relates to electromagnetic relays.

In an electromagnetic relay, when a large current flows between abutting contacts, when the electromagnetic repulsive force generated in the direction of separating the contacts exceeds the contact force between the contacts, the contacts are separated, causing arc discharge. In Patent Document 1, an inclined surface formed on one of the first contact and the second contact divides the electromagnetic repulsive force acting between the first contact and the second contact, thereby reducing the electromagnetic repulsive force in the contact opening direction. It describes the configuration.

JP-A-2007-45583

However, Patent Document 1 is intended to reduce the electromagnetic repulsive force acting in the opening direction between the first contact and the second contact. It cannot be prevented. There is a strong demand for electromagnetic relays that can stably and reliably prevent contact opening due to electromagnetic repulsion.

One aspect of the present disclosure includes an electromagnet, a first electrode having a pair of movable contacts, and a second electrode having a pair of fixed contacts. and a contact mechanism for switching between a closed state in which the pair of fixed contacts are held and an open state in which the pair of movable contacts are separated from the pair of fixed contacts, wherein the first electrode and the second electrode A first current path passing between one of the movable contacts and one of the fixed contacts, and a second current path passing between the other of the movable contacts and the other of the fixed contacts and two current paths, wherein the first electrode and the second electrode are connected to the one movable contact and the one electrode when current flows through the first electrode path and the second electrode path. and a second electromagnetic repulsive force acting between the other movable contact and the other fixed contact are different from each other. It's a relay.

According to such a configuration, contact separation due to electromagnetic repulsion can be prevented with high stability and reliability.

1 is a perspective view of an electromagnetic relay according to this embodiment; FIG. 1 is a vertical cross-sectional view of an electromagnetic relay according to the present embodiment in a contact open state; FIG. 1 is a vertical cross-sectional view of an electromagnetic relay according to the present embodiment in a contact closed state; FIG. 4 shows the electromagnetic repulsive force acting on the contacts of the electromagnetic relay according to the embodiment; 4 is a diagram showing a state in which the counter electrode of Example 1 swings downward; FIG. 4 is a diagram showing a state in which the counter electrode of Example 1 swings upward; FIG. FIG. 11 is an enlarged vertical cross-sectional view of the contact portion according to Example 2 in the contact open state; FIG. 11 is an enlarged vertical cross-sectional view of the contact portion according to Example 2 in the contact closed state; FIG. 11 is an enlarged vertical cross-sectional view of a contact portion according to Example 3 in a contact open state; FIG. 11 is an enlarged vertical cross-sectional view of a contact portion according to Example 3 in a contact closed state; FIG. 11 is an enlarged vertical cross-sectional view of a contact portion according to Example 4 in a contact open state; FIG. 11 is an enlarged vertical cross-sectional view of a contact portion according to Example 4 in a contact closed state; FIG. 11 is an enlarged vertical cross-sectional view of a contact portion according to Example 5 in a contact open state; FIG. 11 is an enlarged vertical cross-sectional view of a contact portion according to Example 5 in a contact closed state; FIG. 11 is an enlarged vertical cross-sectional view of a contact portion according to Example 6 in a contact open state; FIG. 11 is an enlarged vertical cross-sectional view of a contact portion according to Example 6 in a contact closed state; FIG. 11 is an enlarged vertical cross-sectional view of a contact portion according to Example 7 in a contact open state; FIG. 11 is an enlarged vertical cross-sectional view of a contact portion according to Example 7 in a contact closed state; 19 is a partially enlarged view of the movable contact and fixed contact in FIG. 18; FIG. FIG. 11 is an enlarged vertical cross-sectional view of a contact portion according to Example 8 in a contact open state; FIG. 11 is an enlarged vertical cross-sectional view of a contact portion according to Example 8 in a contact closed state; FIG. 22 is a partially enlarged view of a movable contact and a fixed contact in FIG. 21; It is a perspective view of the electromagnetic relay of a comparative example. FIG. 5 is a vertical cross-sectional view of an electromagnetic relay of a comparative example in a contact open state; FIG. 5 is a vertical cross-sectional view of an electromagnetic relay of a comparative example in a contact closed state; The electromagnetic repulsive force acting on the contact portion of the electromagnetic relay of the comparative example is shown.

Next, embodiments of the present disclosure will be described with reference to the drawings. In the referenced drawings, similar components or functional parts are provided with similar reference numerals. In order to facilitate understanding, the scales of these drawings are appropriately changed. Moreover, the form shown in drawing is one example for implementing this invention, and this invention is not limited to the illustrated form.

The electromagnetic relay according to the embodiment of the present disclosure prevents contact opening due to electromagnetic repulsion acting in the contact opening direction with high reliability and stability when a large current flows between the contacts. First, the configuration of the electromagnetic relay of the comparative example will be described with reference to FIGS. 23-26.

FIG. 23 is a perspective view of an electromagnetic relay 30 of a comparative example. In FIG. 23, the cover 11 is shown transparently to show the internal configuration. FIG. 24 is a longitudinal sectional view of the electromagnetic relay 30 with the contacts open. FIG. 25 is a vertical cross-sectional view of the electromagnetic relay 30 with the contacts closed. FIG. 26 shows the electromagnetic repulsive force acting on the contact portion of the electromagnetic relay 30. As shown in FIG. In the following description, as shown in FIG. 23, the longitudinal direction of the base 9 is defined as the front-rear direction, and the left-right direction and the vertical direction are defined with reference to the front-rear direction.

The electromagnetic relay 30 shown in FIGS. 23-25 includes an electromagnet including a coil 4, an iron core 5 and a yoke 12, a movable portion including an armature 3, a hinge spring 10 and a card 6, and a movable electrode 7 each of which is an elastic member. and a contact portion including a fixed electrode 8 . The electromagnet is arranged at one end of the base 9 and the contact portion is arranged at the other end of the base 9 . A movable electrode 7 made of a conductive plate member is fixed at its lower end to a base 9 and has a movable contact 1 at its free end. The fixed electrode 8 is fixed at its lower end to the base 9 and has a fixed contact 2 at its free end. A projection 15 provided on the inner surface of the rear wall of the cover 11 contacts the fixed contact 2 to support the fixed contact 2 from behind.

The longitudinal sectional view of FIG. 24 shows a state in which the coil 4 is not energized and the contact portion is open (contact open). In this state, due to the restoring force of the hinge spring 10, the armature 3 is held at the contact open position swinging clockwise in FIG. When the coil 4 is energized from this state, the armature 3 is attracted to the iron core 5 and swings counterclockwise in FIG. Accordingly, the card 6 is pushed backward to push the movable electrode 7 toward the fixed electrode 8 side. As a result, the movable contact 1 comes into contact with the fixed contact 2 as shown in FIG. 25, and the contact portion is closed (contact closed).

It is assumed that a large current momentarily flows from the movable electrode 7 to the fixed electrode 8 due to external noise or the like while the contacts are closed. In this case, a current flows from the movable electrode 7 to the fixed electrode 8 through the movable contact 1 and the fixed contact 2 along the route indicated by the white arrow in FIG. As a result, an electromagnetic repulsive force (thick line arrow FA) exceeding the contact force between the movable contact 1 and the fixed contact 2 is generated in the direction of separating the movable contact 1 and the fixed contact 2 from each other. An arc discharge occurs at the moment when the movable contact 1 and the fixed contact 2 are separated from each other.

The electromagnetic relay according to the present embodiment is configured to prevent contact separation due to the generation of the electromagnetic repulsive force as described above. FIG. 1 is a perspective view of an electromagnetic relay 100 according to this embodiment. In addition, in FIG. 1, the cover 111 is shown transparently in order to show the internal configuration. FIG. 2 is a vertical cross-sectional view of the electromagnetic relay 100 with its contacts open. FIG. 3 is a vertical cross-sectional view of the electromagnetic relay 100 with the contacts closed. FIG. 4 shows the electromagnetic repulsion acting on the contact portion of the electromagnetic relay 100. As shown in FIG. For convenience of explanation, the longitudinal direction of the base 109 is defined as the front-rear direction as shown in FIG. 1, and the left-right direction and the vertical direction are defined as shown in FIG.

As shown in FIGS. 1-3, the electromagnetic relay 100 includes an electromagnet including a coil 104, an iron core 105 and a yoke 112; A contact portion including a movable electrode 107 and a fixed electrode 108, which are spring members. The electromagnet is arranged at one end of the base 109 and the contact portion is arranged at the other end of the base 109 . The movable electrode 107 has its lower end fixed to the base 109 and has a movable contact 101 at its free end. The movable contact 101 has a pair of movable contacts (first movable contact 101a and second movable contact 101b) which will be described later. The fixed electrode 108 has its lower end fixed to the base 109 and has a counter electrode 114 at its free end. A projection 115 provided on the cover 111 contacts the free end of the fixed electrode 108 to support the fixed electrode 108 from behind.

As shown in FIGS. 1-3, the fixed electrode 108 has a relatively thin proximal end 108b that is elastically deformable and a relatively thick distal end 108a that has higher rigidity than the proximal end 108b. have. A pair of fixed contact electrodes 102 and 103 arranged to face each other are connected to the tip 108a. A counter electrode 114 is composed of the tip 108 a and the fixed contact electrodes 102 and 103 . In the contact closed state of FIG. 3, the movable contact 101 is sandwiched between a pair of fixed contact electrodes 102 and 103 .

As shown in FIG. 4, the movable contact 101 has a first movable contact 101a protruding upward from a horizontal portion 107a at the upper end of the movable electrode 107, and a second movable contact 101b protruding downward. The fixed contact electrode 102 has a plate-like electrode 102b whose base end is connected to a tip 108a, and a fixed contact 102a formed so as to protrude downward at the tip of the electrode 102b. The fixed contact electrode 103 has a plate-like electrode 103b whose base end is connected to the tip 108a, and a fixed contact 103a formed so as to protrude upward at the tip of the electrode 103b.

The cross-sectional view of FIG. 2 shows a state in which the coil 104 is not energized and the contact portion is turned off (contact open). In this state, due to the restoring force of the hinge spring 110, the armature 113 is held at the contact open position in which the armature 113 swings clockwise in FIG. When the coil 104 is energized from this state, the armature 113 is attracted to the iron core 105 and swings counterclockwise in FIG. Accordingly, the card 106 is pushed toward the movable electrode 107 and moves, pushing the movable electrode 107 backward. As a result, the movable contact 101 enters and is sandwiched between the fixed contact electrodes 102 and 103, and the contact portion is turned on (contact closed). When the movable contact 101 is pushed between the fixed contact electrodes 102 and 103, the counter electrode 114 is supported from behind by the protrusion 115. As shown in FIG.

It is assumed that a large current flows from the movable electrode 107 to the fixed electrode 108 while the contacts are closed. The current flowing from the movable electrode 107 to the movable contact 101 flows into the fixed electrode 108 via the first movable contact _101a and the fixed contact 102a. 2, the current path P _B is divided into a current path P B indicated by an outline arrow in FIG. An electromagnetic repulsive force FL1 is generated between the first movable contact 101a and the fixed contact 102a by the current passing through the upper current path P _A , and the second movable contact 101b and the fixed contact 103a are generated by the current passing through the lower current path P _B . An electromagnetic repulsive force FL2 is generated between In this embodiment, the electromagnetic repulsive forces FL1 and FL2 are intentionally made different. A configuration example in which the electromagnetic repulsive force FL1 and the electromagnetic repulsive force FL2 are made different will be described later.

The operation of the contact portion when the electromagnetic repulsive force FL2 is configured to be greater than the electromagnetic repulsive force FL1 will be described. When electromagnetic repulsive forces FL1 and FL2 are generated as shown in FIG. Since the movable electrode 107 is an elastic member, when the movable contact 101 receives a large electromagnetic repulsive force FL2, the movable contact 101 tries to move upward. do not have. Even if the second movable contact 101b and the fixed contact 103a are separated by the electromagnetic repulsive force FL2, the first movable contact 101a pushed upward by the electromagnetic repulsive force FL2 stronger than the electromagnetic repulsive force FL1 is separated from the fixed contact 102a. Since they are in contact with each other, the contact is not separated.

If the electromagnetic repulsive force FL1 and the electromagnetic repulsive force FL2 have the same magnitude, the fixed contact electrode 102 and the fixed contact electrode 103 will be acted upon by the same magnitude of force in directions away from each other. , and the fixed contact electrode 103 are elastically deformed in directions away from each other, resulting in contact separation. In this regard, according to the present embodiment, since the electromagnetic repulsive force FL1 and the electromagnetic repulsive force FL2 are intentionally different in magnitude, it is possible to prevent contact separation from occurring as described above.

As described above, in the present embodiment, the movable contact 101 is sandwiched between the fixed contacts 102a and 103a. The electromagnetic repulsive force FL1 generated between the fixed contacts 102a can be intentionally made different from the electromagnetic repulsive force FL2 generated between the movable contact 101 and the fixed contact 103a. A configuration example for making the electromagnetic repulsive force FL1 and the electromagnetic repulsive force FL2 different will be described below as an example 1-8. Among the embodiments 1-8, the embodiment 1-6 differs in the magnitude of the current flowing through the current path P _A and the magnitude of the current flowing through the current path P _B , whereby the electromagnetic repulsive force FL1 and the electromagnetic repulsive force FL2 It is a configuration that makes the Embodiments 7-8 relate to a configuration in which the curvature of the contact surface of the contact is made different between the contact on the current path P _A side and the contact on the current path P _B side. Since the electromagnets and moving parts of Examples 1-8 have the configurations described in the above embodiments, the following description will focus on the contact parts.

Example 1
The movable electrode 107 according to the first embodiment has an acute angle CA between the horizontal portion 107a and the base portion 107b in the state shown in FIG. The shape and arrangement are set so that the angle CA between the bases 107b is approximately 90 degrees. As a result, when the movable contact 101 is sandwiched between the fixed contact electrodes 102 and 103 as shown in FIG. is larger than the contact force between the first movable contact 101a and the fixed contact 102a. Therefore, the contact resistance between the second movable contact 101b and the fixed contact 103a is smaller than the contact resistance between the first movable contact 101a and the fixed contact 102a. When a large current flows from the movable electrode 107 to the fixed electrode 108 in this state, as shown in FIG. It becomes larger than the electromagnetic repulsive force FL1 generated between the contacts 102a.

As shown in FIGS. 2-4, the electrodes 102b, 103b are formed thicker to have greater stiffness than the proximal end 108b. Further, as described above, the distal end 108a of the fixed electrode 108 is formed thicker so as to have higher rigidity than the proximal end 108b. Therefore, when the electromagnetic repulsive forces FL1 and FL2 are generated as described above, the resultant force of the downward restoring force from the horizontal portion 107a and the downward electromagnetic repulsive force FL2 acts on the fixed contact electrode 103 as indicated by the thick arrow in FIG. However, in the opposing electrode 114, the proximal end 108b is elastically deformed while the movable contact 101 is held therebetween. Therefore, as shown in FIG. 5, the counter electrode 114 swings counterclockwise with the position P supported by the projection 115 as a reference position.

Since the proximal end of the movable electrode 107 is fixed to the base 109, the contact force between the fixed contact 102a and the first movable contact 101a is increased to the fixed contact 103a and the second movable contact 103a as the counter electrode 114 swings counterclockwise. This exceeds the contact force between the contacts 101b, and the contact resistance between the fixed contact 102a and the first movable contact 101a becomes smaller than the contact resistance between the fixed contact 103a and the second movable contact 101b. In this case, as shown in FIG. 6, the electromagnetic repulsive force FL1 becomes larger than the electromagnetic repulsive force FL2, and the opposing electrode 114 swings clockwise with the position P as a reference. Thus, in the state of FIG. 6, the electromagnetic repulsive force FL1 becomes larger than the electromagnetic repulsive force FL2, and the movable contact 101 receives a strong downward force, but the lower fixed contact electrode 103 acts as a stopper to separate the contacts. does not occur.

While the large current is flowing, the opposing electrode 114 repeats the counterclockwise oscillating motion shown in FIG. 5 and the clockwise oscillating motion shown in FIG. 6 with the position P as a reference. Therefore, contact separation is prevented while a large current is flowing through the electromagnetic relay 100 .

Example 2
The electromagnetic relay according to the second embodiment has a configuration in which the movable contact 101 of the movable electrode 107 abuts against the fixed contacts 102a and 103a biased toward either the fixed contact electrode 102 side or the fixed contact electrode 103 side. FIG. 7 is an enlarged vertical cross-sectional view of the contact portion according to Example 2 in the contact open state. FIG. 8 is an enlarged vertical cross-sectional view of the contact portion according to the second embodiment in the contact closed state. FIG. 7 shows a configuration example in which the height of the movable electrode 107 from the base 109 is set so that the movable contact 101 is biased toward the fixed contact electrode 103 side.

When the electromagnet is turned on from the state of FIG. 7 and the movable contact 101 enters between the fixed contact electrodes 102 and 103 and is sandwiched between the fixed contact electrodes 102 and 103, as shown in FIG. The contact force between the second movable contact 101b and the fixed contact 103a becomes larger than the contact force between the first movable contact 101a and the fixed contact 102a. Therefore, the contact resistance between the second movable contact 101b and the fixed contact 103a is smaller than the contact resistance between the first movable contact 101a and the fixed contact 102a. When a large current flows from the movable electrode 107 to the fixed electrode 108 in this state, as shown in FIG. It becomes larger than the electromagnetic repulsive force FL1 generated between the contacts 102a. Since the constituent parts of the counter electrode 114 have higher rigidity than the base end 108b, when the downward electromagnetic repulsive force FL2 acts on the fixed contact electrode 103, the counter electrode 114 and the projection 115 are pushed together as in FIG. It swings downward with the contact position P as a reference value. After that, while the large current flows, the opposing electrode 114 repeats swinging with the position P as a reference, as described above.

As described above, according to the second embodiment, the electromagnetic repulsive force FL1 and the electromagnetic repulsive force FL2 when a large current flows through the electromagnetic relay are made different. Contact separation can be prevented.

There are various methods other than adjusting the height of the movable contact 101 from the base 109 to bias the movable contact 101 toward either the fixed contact electrode 102 side or the fixed contact electrode 103 side. As an example, the height of the first movable contact 101a relative to the horizontal portion 107a of the movable electrode 107 may be different from the height of the second movable contact 101b relative to the horizontal portion 107a. In this case, the movable electrode 107 can be formed so that the horizontal portion 107a is positioned at the vertical center of the fixed contact 102a and the fixed contact 103a.

Example 3
The electromagnetic relay according to the third embodiment has a configuration in which the thicknesses of electrodes 102b and 103b of fixed contact electrodes 102 and 103 are made different. FIG. 9 is an enlarged vertical cross-sectional view of the contact portion according to Example 3 in the contact open state. FIG. 10 is an enlarged vertical cross-sectional view of the contact portion according to Example 3 in the contact closed state. FIG. 9 shows a configuration example in which the thickness d3 of the electrode 103b is made larger than the thickness d2 of the electrode 102b.

Since electrode 103b is thicker than electrode 102b, electrode 103b has higher rigidity than electrode 102b. Therefore, when the electromagnet is turned on from the state of FIG. 9 and the movable contact 101 enters between the fixed contact electrodes 102 and 103 and is sandwiched between the fixed contact electrodes 102 and 103, the contact between the second movable contact 101b and the fixed contact 103a The force becomes larger than the contact force between the first movable contact 101a and the fixed contact 102a. In this case, the contact resistance between the second movable contact 101b and the fixed contact 103a is smaller than the contact resistance between the first movable contact 101a and the fixed contact 102a. When a large current flows from the movable electrode 107 to the fixed electrode 108 in this state, as shown in FIG. It becomes larger than the electromagnetic repulsive force FL1 generated between the contacts 102a. Since the constituent parts of the counter electrode 114 have higher rigidity than the base end 108b, when the downward electromagnetic repulsive force FL2 acts on the fixed contact electrode 103, the counter electrode 114 is brought into contact with the protrusion 115 as in FIG. It swings downward with position P as a reference. After that, while the large current flows, the opposing electrode 114 repeats swinging with the position P as a reference, as described above.

As described above, according to the third embodiment, the electromagnetic repulsive force FL1 and the electromagnetic repulsive force FL2 when a large current flows through the electromagnetic relay are made different. Contact separation can be prevented.

Although the electrode 103b is thicker than the electrode 102b in the configuration examples shown in FIGS. 9 and 10, the electrode 102b may be thicker than the electrode 103b.

Example 4
The electromagnetic relay according to the fourth embodiment has a configuration in which one of fixed contact electrodes 102 and 103 is inclined with respect to a direction perpendicular to fixed electrode 108 (connection surface). The other of the fixed contact electrodes 102 and 103 is vertically fixed to the fixed electrode 108 . FIG. 11 is an enlarged vertical cross-sectional view of the contact portion according to Example 4 in the contact open state. FIG. 12 is an enlarged vertical cross-sectional view of the contact portion according to Example 4 in the contact closed state. FIG. 11 shows a configuration example in which the fixed contact electrode 103 is tilted upward with respect to the direction perpendicular to the fixed electrode 108 .

Since the fixed contact electrode 103 is inclined upward with respect to the direction perpendicular to the fixed electrode 108, the fixed contact electrode 103 is elastically deformed when the movable contact 101 is sandwiched between the fixed contact electrodes 102 and 103. becomes larger. In this case, the contact force between the second movable contact 101b and the fixed contact 103a is greater than the contact force between the first movable contact 101a and the fixed contact 102a. Therefore, the contact resistance between the second movable contact 101b and the fixed contact 103a is smaller than the contact resistance between the first movable contact 101a and the fixed contact 102a. When a large current flows from the movable electrode 107 to the fixed electrode 108 in this state, as shown in FIG. It becomes larger than the electromagnetic repulsive force FL1 generated between the contacts 102a. Since the constituent parts of the counter electrode 114 have higher rigidity than the base end 108b, when the downward electromagnetic repulsive force FL2 acts on the fixed contact electrode 103, the counter electrode 114 shifts the contact position P with the projection 115 as in FIG. Swing downward as a reference. After that, while the large current flows, the counter electrode 114 repeats swinging with the position P as a reference, as described above.

Thus, according to the fourth embodiment, since the electromagnetic repulsive force FL1 and the electromagnetic repulsive force FL2 when a large current flows through the electromagnetic relay are made different, according to the operating principle described above with reference to FIGS. Contact separation can be prevented.

11 and 12, the fixed contact electrode 103 is inclined upward with respect to the direction perpendicular to the fixed electrode 108, but the fixed contact electrode 102 is inclined in the direction perpendicular to the fixed electrode 108. It may also be configured to be inclined downward.

Example 5
The electromagnetic relay according to the fifth embodiment has a configuration in which the length from one fixed end to the free end of fixed contact electrodes 102 and 103 is made different from the other. The fixed contact electrodes 102 and 103 are fixed to the fixed electrode 108 in a so-called cantilever state, and the fixed contact electrode having a shorter length has higher rigidity. FIG. 13 is an enlarged vertical cross-sectional view of the contact portion according to Example 5 in the contact open state. FIG. 14 is an enlarged vertical cross-sectional view of the contact portion according to Example 5 in the contact closed state. FIG. 13 shows a configuration example in which the fixed contact electrode 103 is shorter than the fixed contact electrode 102. As shown in FIG.

Since the fixed contact electrode 103 is shorter than the fixed contact electrode 102, when the movable contact 101 enters between the fixed contact electrodes 102 and 103 and is sandwiched between the fixed contact electrodes 102 and 103, the distance between the second movable contact 101b and the fixed contact 103a is reduced. is larger than the contact force between the first movable contact 101a and the fixed contact 102a. Therefore, the contact resistance between the second movable contact 101b and the fixed contact 103a is smaller than the contact resistance between the first movable contact 101a and the fixed contact 102a. When a large current flows from the movable electrode 107 to the fixed electrode 108 in this state, as shown in FIG. It becomes larger than the electromagnetic repulsive force FL1 generated between the contacts 102a. Since the constituent parts of the counter electrode 114 have higher rigidity than the base end 108b, when the downward electromagnetic repulsive force FL2 acts on the fixed contact electrode 103, the counter electrode 114 moves to the contact position with the projection 115 as in FIG. It swings downward with P as a reference. After that, while the large current flows, the opposing electrode 114 repeats swinging with the position P as a reference, as described above.

As described above, according to the fifth embodiment, the electromagnetic repulsive force FL1 and the electromagnetic repulsive force FL2 when a large current flows through the electromagnetic relay are made different. Contact separation can be prevented.

13 and 14, the fixed contact electrode 103 is made shorter than the fixed contact electrode 102, but the fixed contact electrode 102 may be made shorter than the fixed contact electrode 103. FIG.

Example 6
The electromagnetic relay according to the sixth embodiment has a configuration in which the fixed contact electrodes 102 and the fixed contact electrodes 103 have different resistances. FIG. 15 is an enlarged vertical cross-sectional view of the contact portion according to Example 6 in the contact open state. FIG. 16 is an enlarged vertical cross-sectional view of the contact portion according to Example 6 in the contact closed state. Here, an example in which the conductor resistance of the fixed contact electrode 102 is made larger than the conductor resistance of the fixed contact electrode 103 will be described.

Since the conductor resistance of the fixed contact electrode 102 is greater than the conductor resistance of the fixed contact electrode 103, when a large current flows from the movable electrode 107 to the fixed electrode 103, the current flowing between the second movable contact 101b and the fixed contact 103a will increase. becomes larger than the current flowing between the first movable contact 101a and the fixed contact 102a. Thereby, as shown in FIG. 16, the electromagnetic repulsive force FL2 generated between the second movable contact 101b and the fixed contact 103a becomes larger than the electromagnetic repulsive force FL1 generated between the first movable contact 101a and the fixed contact 102a. Since each constituent part of the counter electrode 114 has higher rigidity than the base end 108b, when the downward electromagnetic repulsive force FL2 acts on the fixed contact electrode 103, the counter electrode 114 and the projection 115 are pushed in the same manner as in FIG. It swings downward with the contact position P as a reference. After that, while the large current flows, the counter electrode 114 repeats swinging with the position P as a reference, as described above.

As described above, according to the sixth embodiment, the electromagnetic repulsive force FL1 and the electromagnetic repulsive force FL2 are different when a large current flows through the electromagnetic relay. Contact separation can be prevented.

Methods for differentiating the conductor resistance between the fixed contact electrodes 102 and 103 include a method for differentiating the conductor resistance between the electrodes 102b and 103b and a method for differentiating the conductor resistance between the fixed contacts 102a and 103a. In the above description, an example in which the conductor resistance of the fixed contact electrode 102 is greater than the conductor resistance of the fixed contact electrode 103 has been described, but the conductor resistance of the fixed contact electrode 103 may be greater than the conductor resistance of the fixed contact electrode 102. .

Example 7
Embodiment 7 is a configuration example in which the curvature of the contact surface 102ax of the fixed contact 102a with the movable contact 101 and the curvature of the contact surface 103ax of the fixed contact a103 with the movable contact 101 are different. FIG. 17 is an enlarged vertical cross-sectional view of the contact portion according to Example 7 in the contact open state. FIG. 18 is an enlarged vertical cross-sectional view of the contact portion according to Example 7 in the contact closed state. Here, a configuration example in which the curvature of the contact surface 102ax is larger than the curvature of the contact surface 103ax will be described.

Assume that a large current flows from the movable electrode 107 to the fixed electrode 108 while the movable contact 101 is sandwiched between the fixed contact electrodes 102 and 103 as shown in FIG. In this case, since there is no difference between the contact force between the fixed contact 102a and the movable electrode 101 and the contact force between the fixed contact 103a and the movable electrode 101, from the movable electrode 107 through the first movable contact 101a and the fixed contact electrode 102 The magnitude of the current _{IA flowing} into the fixed electrode 108 from the movable electrode 107 and the current IB flowing from the movable electrode 107 through the second movable contact 101b and the fixed contact electrode 103 into the fixed electrode 108 is the same.

19A and 19B are partially enlarged views of portions between the first movable contact 101a and the fixed contact 102a and between the second movable contact 101b and the fixed contact 103a in FIG. In FIG. 19, the current flowing through the first movable contact 101a and the current flowing through the fixed contact 102a at the contact position between the first movable contact 101a and the fixed contact 102a are indicated by I _A1 and I _A2 , respectively. Further, the current flowing through the second movable contact 101b and the current flowing through the fixed contact 103a at the contact position between the second movable contact 101b and the fixed contact 103a are indicated as I _B1 and I _B2 , respectively. As shown in FIG. 19, the curvature of contact surface 102ax is greater than the curvature of contact surface 103ax, so angle A1 between currents I _A1 and I _A2 is greater than angle A2 between currents I _B1 and I _B2 . The electromagnetic repulsive force acting between currents flowing in opposite directions decreases as the angle between the currents increases. Therefore, in the configuration example illustrated in FIGS. 17-19, the electromagnetic repulsive force FL2 is greater than the electromagnetic repulsive force FL1. Since each component of the counter electrode 114 has higher rigidity than the base end 108b, when the downward electromagnetic repulsive force FL2 acts on the fixed contact electrode 103, the counter electrode 114 moves downward with respect to the contact position P with the protrusion 115. swing. After that, while the large current flows, the counter electrode 114 repeats swinging with the position P as a reference, as described above.

Thus, according to the seventh embodiment, the upper electromagnetic repulsive force FL1 and the lower electromagnetic repulsive force FL2 are different when a large current flows through the electromagnetic relay. It is possible to prevent contact separation from occurring by the operating principle described above.

Although FIGS. 17-19 show configuration examples in which the curvature of the contact surface 102ax is greater than the curvature of the contact surface 103ax, the curvature of the contact surface 103ax may be greater than the curvature of the contact surface 102ax.

Example 8
Example 8 is a configuration example in which the curvature of the surface of the first movable contact 101a and the curvature of the surface of the second movable contact 101b are made different. FIG. 20 is an enlarged longitudinal sectional view of the contact portion according to the eighth embodiment in the contact open state. FIG. 21 is an enlarged vertical cross-sectional view of the contact portion according to Example 8 in the contact closed state. Here, a configuration example in which the curvature of the first movable contact 101a is made larger than the curvature of the second movable contact 101b will be described.

Assume that a large current flows from the movable electrode 107 to the fixed electrode 108 while the movable contact 101 is sandwiched between the fixed contact electrodes 102 and 103 as shown in FIG. In this case, since there is no difference between the contact force between the fixed contact 102a and the movable electrode 101 and the contact force between the fixed contact 103a and the movable electrode 101, from the movable electrode 107 through the first movable contact 101a and the fixed contact electrode 102 The magnitude of the current _{IA flowing} into the fixed electrode 108 from the movable electrode 107 and the current IB flowing from the movable electrode 107 through the second movable contact 101b and the fixed contact electrode 103 into the fixed electrode 108 is the same.

FIG. 22 is a partially enlarged view of the first movable contact 101a and fixed contact 102a, and the second movable contact 101b and fixed contact 103a in FIG. In FIG. 22, the current flowing through the first movable contact 101a and the current flowing through the fixed contact 102a at the contact position between the first movable contact 101a and the fixed contact 102a are indicated by I _A1 and I _A2 , respectively. Further, in FIG. 22, the current flowing through the second movable contact 101b and the current flowing through the fixed contact 103a at the contact position between the second movable contact 101b and the fixed contact 103a are indicated by I _B1 and I _B2 , respectively. As shown in FIG. 22, since the curvature of the first movable contact 101a is larger than the curvature of the second movable contact 101b, the angle A3 between the currents I _A1 and I _A2 is greater than the angle A4 between the currents I _B1 and I _B2 . is also big. The electromagnetic repulsive force acting between currents flowing in opposite directions decreases as the angle between the currents increases. Therefore, in the configuration example illustrated in FIGS. 20-22, the electromagnetic repulsive force FL2 is greater than the electromagnetic repulsive force FL1. Each component of counter electrode 114 has a higher stiffness than proximal end 108b. Therefore, in this case, when downward electromagnetic repulsive force FL2 acts on fixed contact electrode 103, counter electrode 114 swings downward with reference to contact position P with projection 115, as in FIG. After that, while the large current flows, the opposing electrode 114 repeats swinging with the position P as a reference, as described above.

As described above, according to the eighth embodiment, the upper electromagnetic repulsive force FL1 and the lower electromagnetic repulsive force FL2 are different when a large current flows through the electromagnetic relay. It is possible to prevent contact separation from occurring by the operating principle described above.

Although the curvature of the first movable contact 101a is larger than the curvature of the second movable contact 101b in FIGS. 20-22, the curvature of the second movable contact 101b may be larger than the curvature of the first movable contact 101a. .

Considering that the electromagnetic repulsive force is a force acting between currents flowing in opposite directions, the electromagnetic repulsive force can be considered to be proportional to the product of parallel components of the currents. Therefore, in the configuration of the embodiment 1-8, the current flowing through the first movable contact 101a and the current flowing through the fixed contact 102a in the contact portion between the first movable contact 101a and the fixed contact 102a are parallel and opposite to each other. The first value is the product of the components of the directions. When the product of the directional components is the second value, it can also be expressed as a configuration in which the first value and the second value are different.

Although the present invention has been described using exemplary embodiments, those skilled in the art can make modifications to the above-described embodiments and various other modifications, omissions, and modifications without departing from the scope of the present invention. It will be appreciated that additions can be made.

The configuration for differentiating the electromagnetic repulsive forces FL1 and FL2 described in the above-described embodiment and Example 1-8 includes a pair of movable contacts and a pair of fixed contacts in addition to the electromagnetic relay illustrated in FIGS. It can be applied to various types of electromagnetic relays configured to be clamped.

Reference Signs List 1, 101 movable contact 2, 102a, 103a fixed contact 3, 113 armature 4, 104 coil 5, 105 iron core 6, 106 card 7, 107 movable electrode 8, 108 fixed electrode 9, 109 base 15, 115 projection 30, 100 Electromagnetic relay 101 movable contact 101a first movable contact 101b second movable contact 102, 103 fixed contact electrodes 102a, 103a fixed contacts 102b, 103b electrode 107a horizontal portion 108a tip 108b base end 114 counter electrode

Claims (5)

an electromagnet;
A closing mechanism comprising a first electrode having a pair of movable contacts and a second electrode having a pair of fixed contacts, wherein the pair of movable contacts are sandwiched between the pair of fixed contacts as the electromagnet is operated. a contact mechanism for switching between a state and an open state in which the pair of movable contacts are separated from the pair of fixed contacts;
As a path of current flowing between the first electrode and the second electrode, a first current path passing between one of the movable contacts and one of the fixed contacts, and a current path between the other movable contact and the other and a second current path passing between the fixed contacts,
The first electrode and the second electrode act between the one movable contact and the one fixed contact when current flows through the first current path and the second current path. A first electromagnetic repulsive force and a second electromagnetic repulsive force acting between the other movable contact and the other fixed contact are formed to be different;
electromagnetic relay. The product of the current flowing through the one movable contact and the current flowing through the one fixed contact in the contact portion between the one movable contact and the one fixed contact in the directions opposite to each other and parallel to each other is the first with the value of
The product of the current flowing in the other movable contact and the current flowing in the other fixed contact in the contact portion between the other movable contact and the other fixed contact in the directions opposite to and parallel to each other is the second when the value of
wherein the first value and the second value are different;
The electromagnetic relay according to claim 1. 3. The electromagnetic relay according to claim 1, wherein the amount of current flowing through said first current path and the amount of current flowing through said second current path are different. The first electrode is formed so that a restoring force due to elastic deformation when the pair of movable contacts are sandwiched between the pair of fixed contacts acts on the other fixed contact. 4. The electromagnetic relay according to any one of items 3. The electromagnetic relay according to any one of claims 1 to 3, wherein the second electrode has an elastically deformable base end and a tip end having the pair of fixed contacts.

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