JPH1021810A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic relay whose contact pressure between a normally closed side movable contact and a normally closed side fixed contact is high by providing only the normally closed side movable contact separated from a fixed contact on a movable contact plate. SOLUTION: A normally closed side contact part is constituted by means of a movable contact 8b and a fixed contact 9b provided on a movable contact plate 8 and a fixed terminal 9 respectively. In such a state as the coil 2 of an electromagnet 20 not energized, the plunger 5 of the electromagnet 20 is maintained in its OFF state by means of the spring force of a return spring 11 and the movable contact 8b abuts the fixed contact 9b so as to keep a contact pressure spring 12 compressed. When the coil 2 is energized, a card 7 is driven in a direction to be away from the movable contact plate 8. The first projecting part 7a of the card 7 compresses the return spring 11 to abut the movable contact plate 8 and the contact pressure spring 12 suspended on the other side surface 8d of the movable contact plate 8 and an erected member 13 exerts its spring force on the plunger 5 of the electromagnet 20. Furthermore, when the card 7 is driven, the first projecting part 7a of the card 7 drives the movable contact plate 8 via the return spring 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay provided with a normally-closed movable contact whose contact portion is turned off when an electromagnet operates.

[0002]

2. Description of the Related Art FIGS. 22 and 23 show a first conventional example of this type of electromagnetic relay. This compound, the base A and a normally open side fixed terminal B which is disposed the normally open fixed contact B ₁ provided on the base A, the normally open movable approaching and moving away from the normally open fixed contact B ₁ normally open movable contact plate C the contact C ₁ is provided
When, a normally closed side fixed terminal D which is disposed on the base A with the normally closed side fixed contact D ₁ provided, the normally closed side movable contact E ₁ are provided approaching and moving away from the normally closed side fixed contact D ₁ Normally closed movable contact plate E,
A non-polar electromagnet (not shown) provided with a wound coil and provided with a card F in order to drive both movable contact plates C and E together with a normally open movable contact plate C is used as a contact. A normally-open contact spring G that urges in the contact direction, a normally-close contact spring H that urges the normally-closed movable contact plate E in the contact contact direction, and an normally-open movable contact plate E that is electromagnetized. A return spring J that urges in a direction opposite to the driving direction. Specifically, the normally open side and the normally closed side pressure spring G, H, a concave portion F ₁ of the inner wall and the normally open side and the normally closed side movable contact plate C provided in the card F, respectively compression suspended between E It is, normally open side and the normally closed side movable contact plate C, and held respectively by biased respectively towards the E to the inner wall of the recess F _1. Return spring J is compressed suspended between the wall portion A ₁ and the card F provided on the base A.

Next, the operation of the above device will be described below with reference to FIGS. 22 and 23. In FIG. 23, both contact pressure springs G,
The total F ₁ of the spring load due to H and return spring J shown by a solid line, and the suction force F ₂ of the electromagnet when exciting the coils indicated by broken lines. In the state where the coil of the electromagnet is not excited, as shown in FIG.
Normally open movable contact E ₁ of is separated from the normally open fixed contact B ₁ normally open side fixed terminal B opens. Further, the normally closed side movable contact E ₁ of the normally closed side movable contact plate E is normally closed side fixed is always closed side fixed contact D ₁ of the terminal D abuts, it is biased by the biasing force of the return spring J The normally-closed contact pressure spring H biases the normally-closed movable contact plate E to be urged in the contact contact direction. Therefore, as shown in FIG. 23, at the point A where the coil is not excited, the normally closed movable contact forming the so-called b contact
E ₁ and the normally-closed side fixed contact D ₁ has an initial contact pressure P _NC.

When the coil of the electromagnet is excited, the card F
Is driven by an electromagnet and moves in one direction as indicated by an arrow. Then, the normally-closed contact pressure spring H, which is compressed and suspended between the card F and the normally-closed movable contact plate E, expands.
The contact pressure P _NC gradually decreases from point A to point B as shown in FIG. Eventually the card F reaches the point B is driven directly in contact with the normally closed side movable contact plate E, since the normally closed side movable contact E ₁ is separable from the normally closed side fixed contact D _1, as shown in FIG. 23 In addition, the contact pressure P _NC disappears.

On the other hand, the normally open movable contact plate C continues to be driven into the card F through the normally open side pressure spring G, as shown in FIG. 23, the normally open movable contact C ₁ at point C is always from contact with the normally open fixed contact B ₁ the open side fixed terminal B displacement of the drive direction is restricted. Therefore, the contact pressure P _NO between the normally-open movable contact C ₁ and the normally-open fixed contact B ₁ , which constitutes the so-called a contact, is reduced by the compression of the normally-open contact spring G driven by the card F. gradually increases and, as shown in FIG. 23, the point D is a movable end point of the two movable contact plate C, E which is driven by the card F, total F attraction of larger electromagnet than the _first spring-loaded F as going ₂ keeps the state of the movable end point.

When the excitation of the coil of the electromagnet is stopped in this state, the card F is urged by the return spring J in the direction opposite to the one direction and returns to the original state.

As a second conventional example of this type of electromagnetic relay,
24 and 25 are shown. This member has the same configuration as that of the first conventional example except that a permanent magnet for forming a magnetic path is provided in the electromagnet, and is a member having substantially the same function as the first conventional example. Are given the same reference numerals.

Next, the operation of this device will be described below with reference to FIGS. 24 and 25. In FIG. 25, both contact pressure springs G,
The total F ₁ of the spring load due to H and return spring J shown by a solid line, the suction force F ₂ of the electromagnet when exciting the coils indicated by broken lines, the suction force of the electromagnet when not energized the coil, i.e. the electromagnet the attraction force F ₃ of the permanent magnets is shown by one-dot chain line. In the state where the electromagnet coil is not excited, as shown in FIG.
Normally open movable contact C ₁ of is separated from the normally open fixed contact B ₁ normally open side fixed terminal B opens. Further, the normally closed side movable contact E ₁ of the normally closed side movable contact plate E is normally closed side fixed is always closed side fixed contact D ₁ of the terminal D abuts, it is biased by the biasing force of the return spring J The normally-closed contact pressure spring H biases the normally-closed movable contact plate E to be urged in the contact contact direction. Accordingly, as shown in FIG. 25, the point A in a state where the coil is not energized, between the normally closed side movable contact E ₁ and the normally closed side fixed contact D ₁ is an initial contact pressure P _NC I have.

When the coil of the electromagnet is excited in a specified direction, the card F is driven by the electromagnet and moves in one direction as indicated by an arrow. Then, since the normally closed side pressure spring H compressed suspended between the card F and the normally closed side movable contact plate E is extended, the contact pressure P _NC, as shown in FIG. 25, the point from point A B It becomes smaller gradually toward. Eventually the card F reaches the point B is driven directly in contact with the normally closed side movable contact plate E, since the normally closed side movable contact E ₁ is separable from the normally closed side fixed contact D _1, as shown in FIG. 25 In addition, the contact pressure P _NC disappears.

On the other hand, the normally open movable contact plate C continues to be driven into the card F through the normally open side pressure spring G, as shown in FIG. 25, the normally open movable contact C ₁ is always at point C from contact with the normally open fixed contact B ₁ the open side fixed terminal B displacement of the drive direction is restricted. Therefore, the normally open movable contact C ₁ and the normally open fixed contact B ₁
The contact pressure P _NO between the contact point C and the normally open contact pressure spring G driven by the card F gradually increases, and the movable end points of the movable contact plates C and E driven by the card F If you stop the excitation of the electromagnet coil in the state of point D is, as shown in FIG. 25, the sum F of the suction force F ₃ and the spring load of the large electromagnet of permanent magnets than the sum F ₁ of the spring load
The state of the movable end point is held by the holding force ΔF which is a difference from ₁ .

In this state, when the coil of the electromagnet is excited in the direction opposite to the specified direction, the card F is urged in the direction opposite to one direction by the return spring J in addition to the driving force of the electromagnet, and It returns to the state of.

[0012]

SUMMARY OF THE INVENTION The above-described first and second embodiments
Any of In the electromagnetic relay, as shown in FIGS. 23 and 25, the suction of the electromagnet when the coil is energized during normal close side movable contact E ₁ and the normally closed side fixed contact D ₁ is in contact with less force F _2, for the difference between the spring-loaded F ₁ is small, spring-loaded F ₁
It is impossible to increase the contact pressure P _NC between the normally closed side movable contact E ₁ and the normally closed side fixed contact D ₁ be adjusted. Therefore, the load switching capacity which is opened and closed by the normally closed side movable contact E ₁ and the normally closed side fixed contact D ₁ is reduced, for example, housing, as it has a normally on state to an off state only when an abnormality There is a problem that a target load switching capacity cannot be ensured when used for a distribution board for use.

The present invention has been made in view of the above points, and an object thereof is to provide an electromagnetic relay having a high contact pressure between a normally closed movable contact and a normally closed fixed contact. It is in.

[0014]

According to a first aspect of the present invention, there is provided a movable terminal provided with a fixed contact provided with a fixed contact and a movable contact provided with a movable contact which comes into contact with and separates from the fixed contact. A plate, an electromagnet for driving the movable contact plate in at least one direction, a contact pressure spring for biasing the movable contact plate in the contact contact direction, and a return spring for biasing the movable contact plate in the direction opposite to the one direction. Wherein the movable contact plate is driven by the electromagnet to abut on the fixed contact when the movable contact plate is driven by the electromagnet so that a movable end point when the movable contact plate is moved in one direction is held by the electromagnet. Only the normally-closed movable contact that is separated from the fixed contact, not the open-side movable contact, is provided.

According to a second aspect of the present invention, a fixed terminal provided with a fixed contact, a movable contact plate provided with a movable contact that comes into contact with and separated from the fixed contact, and the movable contact plate are driven in at least one direction. An electromagnet, a contact pressure spring that urges the movable contact plate in the contact direction, and a return spring that urges the movable contact plate in a direction opposite to the one direction. The movable contact plate is a normally closed movable contact that is driven by the electromagnet to be separated from the fixed contact or a normally open contact that contacts the fixed contact in an electromagnetic relay in which a movable end point when the movable contact moves in the direction is held by an electromagnet. One of the side movable contacts is provided, and the electromagnet can be arranged so that the driving direction is either in a direction away from or in the direction of approaching the movable contact plate.

According to a third aspect of the present invention, in any one of the first and second aspects, the fixed terminal comprises:
Each of the fixed contacts is provided with an even number of fixed contacts facing each other.

According to a fourth aspect of the present invention, in any one of the first to third aspects, at least one of the contact pressure spring and the return spring comprises a leaf spring.

According to a fifth aspect of the present invention, in any one of the first to third aspects, the contact pressure spring and the return spring are both leaf springs, and the contact pressure spring and the return spring are provided. Are integrally formed.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the electromagnet is a bistable electromagnet provided with a permanent magnet, and the movable contact is connected to the fixed contact. An auxiliary contact portion that is opened and closed in response to the contact and separation is provided.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. This electromagnetic relay R is
Coil bobbin 1, Coil 2, Fixed iron core 3, Plunger guide 4, Plunger 5, Yoke 6, Card 7, Movable contact plate 8, Fixed terminal 9, Base 10, Return spring 11, Contact spring 12, Standing member 13 is provided.

The movable contact plate 8 and the fixed terminal 9
Movable contact 8b and fixed contact, which will be described
By 9b, a so-called b-contact, which is a normally closed contact portion, or a so-called a-contact, which is a normally open contact portion, can be formed. First, the case where the b contact is configured will be described.

The coil bobbin 1 is provided with flange portions 1c at both ends of a cylindrical winding drum portion 1b having a through hole 1a in the axial direction. The coil 2 is wound around the winding drum section 1b of the coil bobbin 1 in a state where the winding space is restricted between both end flange sections 1c. The fixed iron core 3 is inserted into one end opening side of the through hole 1a of the coil bobbin 1, and a surface facing the plunger 5 is a magnetic pole surface 3a.

The plunger guide 4 has a cylindrical shape having a through hole and a flange 4a at one end.
6, and is inserted into the other end opening side of the through hole 1a of the coil bobbin 1. Plunger 5
Is driven in response to the excitation of the coil 2 to attract and separate from the magnetic pole surface 3a of the fixed iron core 3 to drive the movable contact plate 8 in one direction. The plunger guide 4 is provided in the through hole of the plunger guide 4 to form 5a, more specifically, at the rear end side in one direction of the electromagnet 20 described later.

The yoke 6 includes a yoke main body 6a fixed to the U-shaped fixed iron core 3 and a magnetic path of a magnetic flux generated when the coil 2 is excited by being fixed to the yoke main body 6a, together with the yoke main body 6a. It consists of a lid 6b to be formed.

The above-described coil bobbin 1, coil
2, fixed iron core 3, plunger guide 4, plunger
The 5 and the yoke 6 constitute a non-polar electromagnet 20. The electromagnet 20 is positioned and fixed to the base 10.

The card 7 is formed in the shape of a round bar, one end of which is fixed to the side of the plunger 5 opposite to the magnetic pole surface 5a, and the other end of which has a first protruding portion 7a. The movable contact plate 8 is formed in a flat plate shape, and a card 7
Are provided at both ends of one surface 8a as movable contacts 8b that become normally-closed movable contacts 8c. Fixed terminal 9
Two pieces are provided so as to face each other, and are formed in an L shape by one piece and the other piece, respectively. Each fixed terminal 9 has one terminal screw 9a
Are disposed on the base 10 by screwing, and a fixed contact 9b is provided on the other side of the movable contact 8b so as to be in contact with or separated from the movable contact 8b. Specifically, the fixed contact 9b is a normally closed movable contact 8c.
The fixed contact 9c is a normally-closed fixed contact 9c that comes into contact with and separates from the contact.

The return spring 11 has a spring shape and is compressed and suspended between the first protruding portion 7a at the other end of the card 7 and one surface 8a of the movable contact plate 8. The contact pressure spring 12 has a spring shape and is compression-suspended between an upright member 13 erected on the base 10 and the other surface 8d of the movable contact plate 8.

Next, the operation of this embodiment will be described below with reference to FIGS. In FIG. 3, a total of F ₁ of the spring load of the contact pressure spring 12 and return spring 11 shown by the solid line, and the suction force F ₂ of the electromagnet 20 when the energizing coil 2 shown by a broken line. 3, the plunger 5 of the electromagnet 20 is held off by the spring force of the return spring 11 at the point A where the coil 2 of the electromagnet 20 is not excited. Therefore, the movable contact 8b of the movable contact plate 8
Is the fixed contact of the fixed terminal 9 as shown in FIGS.
9b, and the contact pressure spring 12 is compressed.

When the coil 2 of the electromagnet 20 is excited, the card 7 is driven by the plunger 5 of the electromagnet 20 in one direction, that is, in the direction away from the movable contact plate 8, and moves as indicated by the arrow. Then, the first protrusion of the card 7
7a compresses a return spring 11 which is compressed and suspended between the movable contact plate 8 and one surface 8a of the movable contact plate 8. When the return spring 11 is compressed to a minimum height, the movable contact plate 8 And a contact pressure spring 12 which is compressed and suspended between the other surface 8d of the movable contact plate 8 and the upright member 13, applies the spring force to the electromagnet 20.
To plunger 5.

When the card 7 is further driven, the first projecting portion 7a of the card 7 drives the movable contact plate 8 via the return spring 11 at the point B shown in FIG. In the state of this point B, the difference between the total F ₁ of the suction force F ₂ and the spring load of the electromagnet 20 when the coil 2 energized is increased. And the movable contact 8b
Is separated from the fixed contact 9b at a point C shown in FIG. That is, the contact pressure P _NC is as shown in FIG. Then, the point D is a movable end point, the suction force F ₂ of the large electromagnet 20 than the sum F ₁ of the spring load, the state of the movable end point is maintained.

When the excitation of the coil 2 of the electromagnet 20 is stopped in this state, the card 7 is returned to the return spring 11 and the contact pressure spring.
It is urged in the opposite direction by 12 to return to the original state.

Next, the case where the a contact is formed will be described. Only the differences from the case where the b-contact is configured will be described. In order for the a contact to be configured, the electromagnet 20
The plunger 5 is positioned and fixed to the base 10 so that the driving direction of the plunger 5 approaches the movable contact plate 8.

More specifically, the fixed iron core 3 is provided with a through hole 3b at the center thereof along the axial direction of the coil bobbin 1. One end of the card 7 is fixed to the magnetic pole surface 5 a side of the plunger 5, and penetrates through the through hole 3 b of the fixed iron core 3. This card 7 has a second protruding part
7b is provided. The movable contact 8b of the movable contact plate 8 is a normally-open movable contact 8e. The return spring 11 is
Is compression-suspended between the first projecting portion 7a at the other end and the base 10. The contact pressure spring 12 is compression-suspended between the second projecting portion 7b in the middle of the card 7 and the other surface 8d of the movable contact plate 8.

Next, the operation of this embodiment will be described below with reference to FIGS. In FIG. 6, as in the case where the b-contact is configured, the total F ₁ of the spring load of the contact pressure spring 12 and return spring 11 shown by the solid line, the suction force of the electromagnet 20 when the energizing coil 2 F ₂ is indicated by a broken line. In the state of point A where the coil 2 of the electromagnet 20 is not excited, the plunger 5 of the electromagnet 20 is kept off by the spring force of the return spring 11. Therefore, the movable contact 8b of the movable contact plate 8 is separated from the fixed contact 9b of the fixed terminal 9, which is the normally open fixed contact 9d, as shown in FIGS.

When the coil 2 of the electromagnet 20 is excited, the card 7 is driven by the plunger 5 of the electromagnet 20 in one direction, that is, in the direction approaching the movable contact plate 8, and moves as indicated by the arrow. Then, the return spring 11, which has been compressed and suspended between the first protruding portion 7a of the card 7 and the base 10, comes to be compressed, and at a point B, the movable contact plate 8 Movable contact 8b is fixed terminal 9 fixed contact 9b
Abut. The contact pressure P _{NO at} this time depends on the spring force of the contact pressure spring 12.

When the card 7 is further driven, the second projecting portion 7b of the card 7 presses the contact pressure spring 12 to further compress it, so that the contact pressure P _NC by the contact pressure spring 12 becomes As shown in FIG. 6, it gradually increases from point C to point D.
Then, at the point D which is the movable end point, the total spring load F ₁
The attraction force F ₂ of the large electromagnet 20 than, the state of the movable end point is maintained.

When the excitation of the coil 2 of the electromagnet 20 is stopped in this state, the card 7 is returned to the return spring 11 and the contact pressure spring.
It is urged in the opposite direction by 12 to return to the original state.

In such an electromagnetic relay R, when the movable contact plate 8 is provided with a movable contact 8b as a normally closed movable contact 8c, the normally closed movable contact 8c is driven by the electromagnet 20. Attraction force F of the electromagnet 20 when the coil 2 is excited by moving
Movable position difference is larger between ₂ and the total F ₁ of the spring load, by designing such that contact and separation always closed side fixed contact 9c, the normally closed side and the movable contact 8c with the normally closed side fixed contact 9c it is possible to increase the contact pressure P _NC. Moreover, the movable contact plate 8
The movable contact 8b is provided as the normally open side movable contact 8e, and the electromagnet 20 is disposed so that the driving direction approaches the movable contact plate 8. It can also be used as an electromagnetic relay R provided with the side movable contact 8e.

Further, the fixed contact 9b of the two fixed terminals 9 provided in opposition to each other is moved toward and away from the movable contact 8b, so that the contact contact / separation operation can be more balanced.

Next, a second embodiment of the present invention will be described below with reference to FIGS. FIGS. 7 and 8 show a configuration in which the b-contact is configured, and FIG. 9 shows a configuration in which the a-contact is configured. Members having substantially the same functions as those of the first embodiment are denoted by the same reference numerals, and only different points are described. In the first embodiment, the return spring 11
Although it has a spring shape, in the present embodiment, it has a leaf spring shape.

More specifically, the return spring 11 is compression-suspended between the base 10 and the first protrusion 7a of the card 7. The contact pressure spring 12 is compressed and suspended between a second projecting portion 7b provided on the card 7 and the other surface 8d of the movable contact plate 8.

In such an electromagnetic relay R, in addition to the effect of the first embodiment, the return spring 11 has a leaf spring shape.
The electromagnetic relay R itself can be reduced in size.

Further, since the return spring 11 is in the form of a leaf spring, there is no fear of buckling when the card 7 is driven by the plunger 5.

Next, a third embodiment of the present invention will be described with reference to FIGS.
This will be described below based on No. 11. FIGS. 10 and 11 show a structure in which the b-contact is formed. Members having substantially the same functions as those of the first embodiment are denoted by the same reference numerals, and only different points are described. In the first embodiment, each of the return spring 11 and the contact pressure spring 12 has a spring shape, but in the present embodiment, each has a leaf spring shape.

More specifically, the card 7 is provided at the other end thereof with a third projecting portion 7c which can be brought into direct contact with the movable contact plate 8 when driven by the plunger 5. Return spring 11
Has a base end portion fixed to the base 10 and a front end portion provided in a third protruding portion 7c provided at an intermediate portion of the card 7.
Is in contact with The return spring 11 applies a spring force to the fourth protruding portion 7d of the card 7 to return the plunger 5 to a state before the coil 2 is excited. The contact pressure spring 12
Its base end is fixed to the base 10 and its front end is fixed to the other surface 8d of the movable contact plate 8. The contact pressure spring 12 has a spring force to secure a contact pressure _PNC between the movable contact 8b and the fixed contact 9b before the coil 2 is excited.

In this electromagnetic relay R, in addition to the effects of the first embodiment, since both the return spring 11 and the contact pressure spring 12 are plate springs, the first embodiment using a spring spring is used. The electromagnetic relay R itself can be made smaller than in the form.

Since the return spring 11 and the contact pressure spring 12 are both leaf springs, the card
There is no danger of buckling when driving 7.

Also, since the card 7 has its third projecting portion 7c directly abutting on the movable contact plate 8 without any intervening members,
The positional accuracy between the card 7 and the movable contact plate 8 increases,
The contact contact / separation state between the fixed contact 9b and the movable contact 8b is better than in the first embodiment.

The return spring 11 applies its spring force directly to the card 7 instead of the movable contact plate 8, so that the contact pressure _PNC at the time of return hardly decreases.

The contact pressure spring 12 is rotatable about a base end portion fixed to the base 10, so that a contact portion between the movable contact 8b and the fixed contact 9b is displaced, that is, a so-called rolling operation. The welding between the movable contact 8b and the fixed contact 9b due to the arc can be removed.

Further, when a short circuit accident occurs in a load (not shown) connected to the present electromagnetic relay R, the short circuit current is interrupted by a breaker (not shown) until the short circuit current is interrupted. Even when a short-circuit current flows, the leaf spring-like contact pressure spring 12, which is generally formed to have a small cross-sectional area due to having a flexible spring force, is not an electric path through which the short-circuit current flows. There is no.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.
13 will be described below. FIGS. 12 and 13 show a structure in which the b-contact is configured. Members having substantially the same functions as those of the third embodiment are denoted by the same reference numerals, and only different points are described. In the third embodiment, the return spring 11 is a separate member from the contact pressure spring 12, but is integrally formed in the present embodiment.

More specifically, the return spring 11 is formed in a substantially U-shaped cross section by a central piece and both opposing pieces, and a hole is formed in the central piece.
11a is provided. The return spring 11 is fixed to the base 10 by press-fitting and holding a hole 11a in a projection 10a provided on the base 10.

In this electromagnetic relay R, in addition to the effect of the third embodiment, the number of parts can be reduced by integrally forming the contact pressure spring 12 and the return spring 11.

Next, a fifth embodiment of the present invention will be described with reference to FIGS.
This will be described below based on No. 21. FIGS. 14 to 16 show a structure in which the b contact is formed. Members having substantially the same functions as those of the first embodiment are denoted by the same reference numerals, and only different points are described. In the first embodiment, the electromagnet 20 is of a non-polar type.
It is a polar-type bistable electromagnet provided with 14, and further provided with an auxiliary contact portion 15 which is opened and closed in response to the movable contact 8b coming into and out of contact with the fixed contact 9b. In addition,
The auxiliary contact portion 15 has a so-called c-contact configuration in which both a normally open contact portion 15a and a normally closed contact portion 15b are provided.

More specifically, the auxiliary contact portion 15 includes a normally open auxiliary fixed terminal 15d provided with a normally open auxiliary fixed contact 15c, and a normally closed auxiliary fixed terminal 15 provided with a normally closed auxiliary fixed contact 15e.
f, an auxiliary leaf spring 15j provided with normally open and normally closed movable contacts 15g and 15h, respectively, and a support terminal 15k for supporting the auxiliary leaf spring 15j.

More specifically, a movable shaft 5b provided on the magnetic pole surface 5a side of the plunger 5 allows the auxiliary leaf spring 15j to penetrate through a through hole 3b provided in the fixed iron core 3, and one direction thereof. When driven in the opposite direction, the normally-open auxiliary fixed contact 15c that forms the normally-open contact 15a and the normally-movable contact 15g that make up the normally-open movable contact 15g come and go, and the normally-closed contact that forms the normally-closed contact 15b. The side auxiliary fixed contact 15e and the normally closed movable contact 15h come into contact with and separate from each other.

Next, the operation when this structure constitutes the b contact will be described below with reference to FIGS. In FIG. 16, the total F ₁ of the spring load of the contact pressure spring 12 and return spring 11 and the auxiliary plate spring 15j shown by solid lines,
The attraction force F ₂ of the electromagnet 20 when the energizing coil 2 indicated by broken lines, the electromagnet 20 when not energized the coil 2
Suction force of, that shows the attraction force F ₃ of the permanent magnet 14 by one-dot chain line. In FIG. 16, in the state of point A where the coil 2 of the electromagnet 20 is not excited, the movable contact 8b of the movable contact plate 8 comes into contact with the fixed contact 9b of the fixed terminal 9 as shown in FIGS. ing.

When the coil 2 of the electromagnet 20 is excited in the designated direction, the card is moved by the electromagnet 20 in one direction, that is, the movable contact plate.
8 and moves to a point B where the first projecting portion 7a comes into contact with the movable contact plate 8, as shown in FIG. In the state of this point B, the electromagnet when the coil 2 is excited in the specified direction
The difference between the total F ₁ of the suction force F ₂ and the spring load 20 is large. Then, the movable contact 8b is separated from the fixed contact 9b at a point C shown in FIG. That is, the contact pressure P _NC is as shown in FIG.
It becomes as shown in. Then, when the excitation of the coil 2 of the electromagnet 20 is stopped in the state of the point D which is the movable end point of the movable contact plate 8 driven by the card 7, as shown in FIG. the ₃ and holding force which is the difference between total F ₁ of the spring load [Delta] F, the state of the movable end point is maintained.

When the coil 2 of the electromagnet 20 is excited in the direction opposite to the specified direction in this state, the card 7
In addition to the driving force of 20, the return spring 11 and the contact pressure spring 12 urge in the opposite direction to one direction to return to the original state.

Next, the operation when this structure constitutes the a contact will be described below with reference to FIG. In FIG. 17, as in the case where the b contact is formed, the sum F of the spring loads by the contact pressure spring 12, the return spring 11, and the auxiliary leaf spring 15j is obtained.
₁ is indicated by a solid line, and the electromagnet when coil 2 is excited
The attraction force F ₂ of 20 indicated by broken lines, and the suction force F ₃ of the electromagnet 20 when not energized coil 2 shown by a broken line. In the state of the point A where the coil 2 of the electromagnet 20 is not excited, the movable contact 8b of the movable contact plate 8 is separated from the fixed contact 9b of the fixed terminal 9.

When the coil 2 of the electromagnet 20 is excited in the designated direction, the card 7 is driven by the electromagnet 20 in one direction, that is, in the direction approaching the movable contact plate 8, and then the card 7 is moved to the point B as in the first embodiment. Then, the movable contact 8b of the movable contact plate 8 comes into contact with the fixed contact 9b of the fixed terminal 9 with the contact pressure P _NO .

When the card 7 is further driven, as in the first embodiment, the contact pressure P _NC by the contact pressure spring 12 gradually increases from the point C to the point D as shown in FIG. Then, at the point D which is the movable end point, and when the excitation of the coil 2 of the electromagnet 20 is stopped in the state of the point D which is the movable end point of the movable contact plate 8 driven by the card 7, as shown in FIG. the holding force ΔF which is the difference between total F ₁ of the suction force F ₂ and the spring load of the permanent magnet 14 of the electromagnet 20, the state of the movable end point is maintained.

When the coil 2 of the electromagnet 20 is excited in the direction opposite to the specified direction in this state, the card 7
In addition to the driving force of 20, the return spring 11 and the contact pressure spring 12 urge in the opposite direction to one direction to return to the original state.

Next, a case where the present electromagnetic relay R is used as a remote control relay will be described. As shown in FIGS. 18 and 21, the electromagnetic relay R has a remote control transformer T and a remote control switch S connected between the other end of the coil 2 and the support terminal 15k of the auxiliary contact portion 15, and is normally open. Diodes 16 and 17 between the side auxiliary fixed terminal 15d and the normally closed auxiliary fixed terminal 15f and the coil 2.
Are respectively connected. For details, normally closed auxiliary fixing terminal
15f is connected in series to the cathode of the diode 17, the normally open auxiliary fixed terminal 15d is connected in series to the anode of the diode 16, and the anode of the diode 17 and the diode
16 cathodes are connected in series to one end of coil 2.

The remote control switch S is
Operation switch S ₁ , capacitor S ₂ , light emitting diode S ₃ ,
S ₄ , SCRS ₅ , S ₆ , and transistor S ₇ are provided.

Next, the operation of the electromagnetic relay R will be described in detail with reference to FIGS. 18 to 21 together with the operation of each element of the remote control switch S.

[0068] Operation switch S ₁ of the remote control switch S is, as shown in FIG. 18, when between the common terminal S ₈ the normally closed side terminal S ₉ is in the ON state, the fixed contacts 9b of the electromagnetic relay R And the movable contact 8b is in an off state. In this state, the auxiliary contact unit 15 is normally closed side contact portion 15b is in the ON state, a current i ₁ flows in the arrow Shimesuru so by the solid line, is lit light emitting diodes S ₃ that the current i ₁ flows The off state between the fixed contact 9b and the movable contact 8b of the present electromagnetic relay R is shown. This current i ₁ flows from the gate of the SCRS ₅ to the cathode, becomes the gate current of the SCRS ₅ , and further flows from the normally closed contact portion 15 b of the auxiliary contact portion 15 to the coil 2 via the diode 17. The current i ₂ flows through the arrows Shimesuru so by broken lines, the capacitor S ₂ is charged.

Next, by operating the operation switch S _1, as shown in FIG. 19, the moment of the on-state between the common terminal S ₈ and the normally-open terminal S _10, is charged in the capacitor S ₂ It was to charge the discharge, the current i ₃ flowing through the arrows Shimesuru so by the dashed line, the light emitting diode S ₃ which is the current i ₃ flowing lights. Since this current i ₃ has a gate current of the current i ₁ in the same manner as SCRS _5, by between a common terminal S ₈ and the normally-open terminal S ₁₀ in the ON state, the current i ₄ is a solid line S as shown by the arrow
It flows from the anode of CRS ₅ to the cathode. When the coil 2 is excited by the current i ₄ and the electromagnet 20 operates, the space between the fixed contact 9b and the movable contact 8b is turned on,
The opening and closing of the load circuit L is controlled. Thereafter, the contact portion that turns on the auxiliary contact portion 15 is switched to the normally open contact portion 15.
a turns on, but the forward direction of the diode 16 connected to the normally open auxiliary fixing terminal 15d of the normally open contact 15a
Since the direction of flow of i ₄ is opposite, the current i ₄ stops flowing and 2 is not excited. Operation switch S ₁ described above
After the operation, common between terminal S ₈ and the normally closed side terminal S ₉ is in the ON state, as shown in FIG. 20, current i ₅ flows through the arrow Shimesuru so by the solid line. That is, after the current i ₅ flows through the coil 2, the diode 16 outputs the normally open contact portion 15 a of the auxiliary contact portion 15.
The flow, the base current of Totanjisuta S ₇ further flows from the emitter of Totanjisuta S ₇ to the base. The light emitting diode S ₄ is turned to the current i ₅ flows indicates the on state of the fixed contacts 9b and the movable contact 8b of the electromagnetic relay R.
Also, the current i ₆ flows as indicated by the dashed arrow and the capacitor
S ₂ is charged.

Next, by operating the operation switch S _1, as shown in FIG. 21, the moment of the on-state between the common terminal S ₈ and the normally-open terminal S _10, is charged in the capacitor S ₂ and electric charge is discharged, current i ₇ flows through the arrows Shimesuru so by broken lines, light-emitting diodes S ₄ this current i ₇ flows is turned on. This current i ₇
Arrow, because they become the base current of similarly transistor S ₇ a current i _5, by between a common terminal S ₈ and the normally-open terminal S ₁₀ in the ON state, a current i ₈ is a dashed line so to Shimesuru, flows from the emitter of the transistor S ₇ to the collector. This current i ₈ further flows from the gate of SCRS ₆ to the cathode to become the gate current of SCRS ₆ , so that current i ₉ flows from the anode to the cathode of SCRS ₆ ,
A coil 2 is excited by the current i _9, by the electromagnet 20 is operated, between the fixed contact 9b and the movable contact 8b is turned off, the load circuit L is on-off controlled. After that, the contact portion that turns on the auxiliary contact portion 15 is switched, and the normally closed contact portion 15b is turned on, but the diode connected to the normally closed auxiliary fixed terminal 15f of the normally closed contact portion 15b. Since the forward direction of 17 is opposite to the direction of current i ₉ ,
Coil 2 is no longer exciting current i ₉ is no longer flows.

In the electromagnetic relay R, in addition to the effect of the first embodiment, the auxiliary contact portion 15 that opens and closes in response to contact and separation between the movable contact 8b and the fixed contact 9b is provided. The application as the relay R is widened, and as described above, it can be used as a remote control relay.

In each of the first to fourth embodiments, the electromagnet 20 can be arranged so that the driving direction is either the direction away from the movable contact plate 8 or the direction approaching it. When only the b-contact is configured, it is not necessary to be able to arrange in this way.

In each of the first to fourth embodiments, when the driving direction of the electromagnet 20 is in the direction approaching the movable contact plate 8, the a contact is formed and the driving direction is in the direction away from the movable contact plate 8. When the b contact is formed, for example, by changing the shape of the card 7, when the driving direction of the electromagnet 20 becomes a direction away from the movable contact plate 8, the a contact is formed and the driving direction is movable. The same effect can be obtained even if the b-contact is formed when approaching the contact plate 8.

In each of the first to fifth embodiments, two fixed terminals 9 are provided facing each other. However, when the contact contact / separation operation is well balanced, one fixed terminal 9 may be provided. Good.

In the second embodiment, the return spring 11 is formed in a leaf spring shape. However, the electromagnetic relay R itself can be downsized even if the contact pressure spring 12 is formed in a leaf spring shape. .

[0076]

According to the first aspect of the present invention, the movable contact plate is provided with only the normally closed movable contact unlike the first and second conventional examples. By being moved by being driven by an electromagnet and being designed to be brought into contact with and separated from the normally closed fixed contact at a movable position where the difference between the attractive force of the electromagnet and the spring load at the time of coil excitation becomes large,
The contact pressure with the normally closed fixed contact can be increased.

According to a second aspect of the present invention, when a normally-closed movable contact is provided on a movable contact plate, the normally-closed movable contact is moved by being driven by the electromagnet to move the electromagnet when the coil is excited. The contact pressure between the normally-closed movable contact and the normally-closed fixed contact is increased by designing the movable contact where the difference between the suction force and the spring load is large so that the contact is separated from the normally-closed fixed contact. be able to. Moreover, the normally open movable contact is provided on the movable contact plate instead of the normally closed movable contact, and the arrangement of the electromagnets is changed so that the driving direction is closer to the movable contact plate or away from the movable contact plate. By doing so, it can be used as an electromagnetic relay provided with a normally open movable contact without changing other components.

According to a third aspect of the present invention, in addition to the effects of the first or second aspect, an even number of fixed contacts of the even number of fixed terminals facing each other are respectively connected to and separated from the movable contacts. Thereby, the balance of the contact contact / separation operation can be improved.

The invention according to claim 4 has the effect of any one of claims 1 to 3. By making at least one of the contact pressure spring and the return spring a leaf spring, the electromagnetic relay itself can be made smaller than when a spring-like spring is used.

According to the fifth aspect of the present invention, the number of parts can be reduced by integrally forming the contact pressure spring and the return spring in addition to the effects of any one of the first to third aspects.

According to a sixth aspect of the present invention, in addition to the effects of any one of the first to fifth aspects, an auxiliary contact portion which opens and closes in response to contact and separation between the movable contact and the fixed contact is provided. Thus, the application as an electromagnetic relay is widened, and for example, it can be used as a remote control relay.

[Brief description of the drawings]

FIG. 1 is a plan sectional view when a first embodiment of the present invention is a b-contact type.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an explanatory diagram of a relationship between a spring load and an attraction force of an electromagnet when the above is a b-contact type.

FIG. 4 is a plan cross-sectional view when the above-mentioned device is used as an a-contact type.

FIG. 5 is a sectional view taken along line XX of FIG. 4;

FIG. 6 is an explanatory diagram of a relationship between a spring load and an attraction force of an electromagnet when the above-mentioned device is a contact type.

FIG. 7 is a plan cross-sectional view when a second embodiment of the present invention is a b-contact type.

FIG. 8 is a cross-sectional plan view when the above-described device is used as an a-contact type.

FIG. 9 is a sectional view taken along line XX of FIG. 9;

FIG. 10 is a plan cross-sectional view when a third embodiment of the present invention is a b-contact type.

FIG. 11 is a sectional view taken along line XX of FIG. 10;

FIG. 12 is a plan cross-sectional view when a fifth embodiment of the present invention is a b-contact type.

FIG. 13 is a sectional view taken along line XX of FIG.

FIG. 14 is a plan cross-sectional view when a sixth embodiment of the present invention is a b-contact type.

FIG. 15 is a sectional view taken along line XX of FIG. 14;

FIG. 16 is an explanatory diagram of a relationship between a spring load and an attraction force of an electromagnet when the above-described device is a contact type.

FIG. 17 is an explanatory diagram of a relationship between a spring load and an attraction force of an electromagnet when the above is a b-contact type.

FIG. 18 is an explanatory diagram of the operation when the above is used as a b-contact specification for a remote control relay.

FIG. 19 is an operation explanatory diagram following FIG. 16 of the above.

20 is an operation explanatory diagram following FIG. 17 of the above.

FIG. 21 is an operation explanatory diagram following FIG. 18 of the above.

FIG. 22 is a plan sectional view of the first conventional example.

FIG. 23 is an explanatory diagram of a relationship between a spring load and an attractive force of an electromagnet of the above.

FIG. 24 is a plan sectional view of a second conventional example.

FIG. 25 is an explanatory diagram of a relationship between a spring load and an attraction force of an electromagnet of the above.

[Explanation of symbols]

 8 Movable contact plate 8b Movable contact 8c Normally closed movable contact 8e Normally open movable contact 9 Fixed terminal 9b Fixed contact 11 Return spring 12 Contact pressure spring 15 Auxiliary contact 20 Electromagnet

Claims (6)

[Claims] 1. A fixed terminal provided with a fixed contact, a movable contact plate provided with a movable contact that comes into contact with and separated from the fixed contact, an electromagnet that drives the movable contact plate in at least one direction, and a movable contact plate. A contact pressure spring that urges in the contact direction, and a return spring that urges the movable contact plate in a direction opposite to one direction,
A movable contact plate is an electromagnetic relay in which a movable end point when driven and moved in one direction is held by an electromagnet, wherein the movable contact plate is driven by the electromagnet and is in contact with the fixed contact. An electromagnetic relay, wherein only a normally-closed movable contact which is separated from the fixed contact is provided. 2. A fixed terminal provided with a fixed contact, a movable contact plate provided with a movable contact that comes into contact with and separated from the fixed contact, an electromagnet driving the movable contact plate in at least one direction, and a movable contact plate. A contact pressure spring that urges in the contact direction, and a return spring that urges the movable contact plate in a direction opposite to one direction,
A movable contact plate is an electromagnetic relay in which a movable end point when driven and moved in one direction is held by an electromagnet, wherein the movable contact plate is driven by the electromagnet and is separated from the fixed contact. Alternatively, one of the normally-open movable contacts abutting on the fixed contact is provided, and the electromagnet is disposed such that the driving direction is either a direction away from the movable contact plate or a direction approaching the movable contact plate. An electromagnetic relay characterized by being made possible. 3. The electromagnetic relay according to claim 1, wherein an even number of the fixed terminals are provided so as to face each other with the fixed contacts. 4. The electromagnetic relay according to claim 1, wherein at least one of the contact pressure spring and the return spring comprises a leaf spring. 5. The electromagnetic device according to claim 1, wherein each of the contact pressure spring and the return spring is formed of a leaf spring, and the contact pressure spring and the return spring are integrally formed. relay. 6. The electromagnet according to claim 1, wherein the electromagnet is a bistable electromagnet provided with a permanent magnet, and has an auxiliary contact portion which is opened and closed in response to the movable contact coming into and out of contact with the fixed contact. The electromagnetic relay according to any one of claims 1 to 5, wherein