JP2006196362A - Latch type relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a latch type relay which prevents stay of arc generated by cut-off of the electric line and performs extinction of the arc promptly by making act on the arc a magnetic flux of self-induction magnetic field by an electric current which flows until the arc is extinguished in the relay. <P>SOLUTION: A part of the magnetic flux generated in a yoke 2 is added to the magnetic flux of a magnet, and is led to the control contact 4 side, and the arc generated between a movable contact 42 and a fixed contact 41 is extended and extinguished. The fixed contact 41 is installed at a first fixed terminal T1 having a screen shape main body T1A, and the movable contact 42 is installed on a plate spring 8 which is depressed by receiving action of an operating member 3 in order to contact the fixed contact 41. The upper end of the plate spring 8 is connected to a second fixed terminal T2 and the second fixed terminal extends to the upper part and has a first electric line formation part T2A in parallel to the longitudinal direction of the plate spring 8, and the gap B between the first electric line formation part T2A and the screen shape main body T1A of the first fixed terminal T1 is made smaller than the gap A between the plate spring 8 and the screen shape main body T1A of the first fixed terminal T1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is an improvement of a latch-type relay configured to extinguish arc discharge generated at a control contact by magnetism.

  Conventionally, in a relay that opens and closes an electric circuit, a potential difference between a fixed contact that forms a control contact and a movable contact is rapidly caused by an inductive component included in the electric circuit that is interrupted at the moment when the control contact is opened from the closed state. And the insulation in the air is broken, and arc discharge occurs there.

  As can be seen from the fact that this arc discharge has been put into practical use with, for example, an arc electric discharge machine, the metal in the discharge portion is melted and evaporated by heat generation, so that the control contact of the relay is damaged every time it is opened. It becomes exhausted and the performance cannot be maintained. Such deterioration of the control contact due to arc discharge becomes severe when the interrupted current is a direct current or a high current.

  A technique for extending the life of the relay in response to such deterioration of the control contact due to the arc current is disclosed in the following patent documents.

  That is, in Patent Document 1, a magnet is inserted in the middle of a magnetic circuit, magnetic side paths are provided at both ends of the magnet, and the direction of current flowing through a control contact disposed in the magnetic side path is determined by the surrounding magnetic field. A keep relay (latch type relay) that is orthogonal to the direction is disclosed, and in this configuration, the arc of the arc discharge that occurs when the control contact is opened is magnetized and greatly bent and lengthened. As a result of the increase in the voltage required for the arc discharge, the arc discharge quickly disappears.

  However, in the above configuration, although the arc discharge duration is shortened by the magnetic arc extinguishing action, the arc generated by the arc discharge does not move from the control contact to another place, so that the control contact is prevented from being consumed. The effect is not enough.

  Patent Document 2 discloses a switch having a configuration in which a magnetic material is provided only in the latter of the movable contact and the fixed contact of the control contact. In this configuration, the arc generated by the arc discharge moves in response to the magnetic field generated by the current of the movable contact, so that the consumption of the control contact is reduced.

However, in the above configuration, the arc moves to the tip of the movable contact and then stops there, causing intensive damage to that portion.
Japanese Utility Model Publication No. 51-63144 JP-A-61-222014

  In order to solve the above problem, the present invention effectively uses the magnetic flux generated from the energizing coil that drives the relay to move the arc generated when the electric circuit is interrupted from the control contact. A latch-type relay that generates a self-induced magnetic field by the current that flows until the arc is extinguished and acts on the arc by the resulting magnetic flux to prevent the arc from staying and to extinguish the arc quickly. The purpose is to provide.

  In order to achieve the above object, in claim 1, when a current-carrying coil is wound, and a yoke with a built-in magnet and a current-carrying switch to the current-carrying coil are attracted and released to one end of the yoke, An operating piece that moves between an open position and a closed position; and a control contact that opens and closes a current by moving a movable contact that receives the movement of the operating piece to and from a fixed contact. When the control contact is opened and the current is interrupted, a part of the magnetic flux generated in the yoke by the energizing coil is guided to the control contact side, whereby the movable contact and the fixed contact are A latch-type relay in which an arc generated between them is extended to a side end of a leaf spring to extinguish the arc, wherein the fixed contact is provided on a first fixed terminal having a partition-shaped main body, and is movable Since the contact is in contact with the fixed contact, the operation The upper end of the leaf spring is connected to the second fixed terminal, the second fixed terminal extends upward, and the leaf spring of the leaf spring is A first electric circuit forming part that forms an electric circuit parallel to the longitudinal direction, and a gap between the first electric circuit forming part and the screen-like main body part of the first fixed terminal; The fixed terminal is formed so as to be smaller than a gap between the fixed terminal and the screen-like main body.

  According to a second aspect of the present invention, the second fixed terminal has a structure in which a second electric circuit forming portion that is substantially orthogonal to the first electric circuit forming portion is further extended below the first electric circuit forming portion. According to claim 3, the screen-like main body portion of the first fixed terminal is gradually formed such that the gap formed in the portion facing the first electric circuit forming portion of the second fixed terminal is directed upward. We propose a latch-type relay that is narrow and narrow.

  According to a fourth aspect of the present invention, the operating piece is formed in a shape having an extending portion that protrudes toward the control contact side, so that when the control contact is separated, the composite magnetic flux generated by the energizing coil and the magnet is provided. A part of this is leaked to the control contact side through the extending portion.

In the fifth and sixth aspects, the formation of the second fixed terminal is specified.
That is, in the fifth aspect, the second fixed terminal is formed in an inverted L shape by extending the arm portion on top of one columnar portion, and the upper end of the leaf spring is fixed to the arm portion. The latch type relay in which this one columnar portion constitutes the first electric circuit forming portion is proposed, and in claim 6, the second fixed terminal has a horizontal portion at the upper portion of the two columnar portions. A latch-type relay is proposed that is formed in a connected arch shape, the upper end of a leaf spring is fixed to a horizontal part, and one of the two columnar parts constitutes a first electric circuit forming part.

According to the latch type relay of the present invention described in claims 1 to 6, when the control contact is opened, the magnetic flux generated by energization of the energizing coil is merged with the magnetic flux generated by the magnet for latching to the control contact side. Thus, by increasing the magnetic flux density intersecting with the arc generated at the control contact, the arc is moved to the side end of the leaf spring, and further jumped into the gap between the first fixed terminal and the second fixed terminal. Arc energy is attenuated while moving.
Then, the arc induced in the gap between the first fixed terminal and the second fixed terminal forms the first electric circuit of the second fixed terminal by the current flowing through the second fixed terminal until the arc is extinguished. Since the magnetic flux generated in the part acts, the arc moves upward between the first and second fixed terminals.
Therefore, the problem that the arc stays in a specific part and the specific part is consumed intensively is solved.

  In particular, in the second aspect, the second fixed terminal has a structure in which a second electric circuit forming portion that is substantially orthogonal to the first electric circuit forming portion is further extended below the first electric circuit forming portion. Inside the orthogonal part, magnetic fluxes generated by the currents flowing through the first and second electric circuit forming parts are applied in the same direction, and the movement of the arc is further promoted.

  According to a third aspect of the present invention, in the screen-like main body portion of the first fixed terminal, the gap formed in the portion facing the first electric circuit forming portion of the second fixed terminal is gradually narrowed toward the upper side. Since it is formed in a thin shape, the stretched arc increases in electric field strength, moves upward, and can extinguish rapidly by reducing the arc energy.

  Further, in claim 4, a magnetic circuit is formed by superimposing the magnetic flux generated in the energizing coil on the magnetic flux of the magnet and guiding it as a leakage magnetic flux on the control contact side by the operating piece which is a basic component of the relay. The relay structure can be simplified.

1A to 1C are schematic cross-sectional views showing the structure when the present invention is applied to a latching relay. Here, (a) is a schematic sectional view when the relay is viewed from above, (b) is a schematic sectional view when the relay is viewed from the front, and (c) is a schematic sectional view when the relay is viewed from the side. FIG.
Further, XX, YY, and ZZ indicate cutting lines when viewed from the side, above, and front, respectively.

  The latching relay R is configured on the insulating base 1 and has a block body covered with an insulating case 5 as a whole.

  The insulating base 1 is made of a thick and highly insulating resin, and has a through hole 11 and a recess 12. A yoke 2 having an “U” -shaped cross section having an open end is inserted into and fixed to the through hole 11, and the leg portion of the first fixed terminal T 1 is located below the insulating base 1. T1B, the leg portion T2B of the second fixed terminal T2, and the pair of coil energizing terminals T3 and T4 are projected.

  Reference numeral 14 denotes a vertically long groove formed in the insulating base 1. The arc generated when the movable contact 42 is separated from the fixed contact 41 is stretched by acting as a leakage magnetic flux, which will be described later. 2 when it jumps between the main body portions T1A and T2A of the fixed terminal, the metal vapor or carbon powder generated in the vicinity thereof is dropped into the insulating base 1 and the first and second fixed terminals T1, The short circuit of T2 is prevented.

  The yoke 2 is made of, for example, pure iron or a semi-hard magnetic material. A bobbin 7 around which a current-carrying coil 6 is wound is attached to one side of a “U” -shaped main body having an open end, and the other side is attached. As shown in FIG. 1 (b), the permanent magnet 9 is embedded with the magnetic poles facing it, and at its upper end, two protrusions 21 and 21 for swingably supporting the operating piece 3 as an actuator are supported. Is forming.

  The operating piece 3 is a plate material made of a magnetic material, like the yoke 2, and is sucked into or released from the opening end of the yoke 2, and a first free end 31 which will be described later. An intermediate portion with the second free end 32 that applies a pressing force to the control contact 4 is bent to form a “<” shape, and in the vicinity of the bent portion 33, the two protrusions 21 of the yoke 2, Cutout portions 35, 35 into which 21 is inserted are formed, and the operating piece 3 is supported by the cutout portions 35, 35 so as to be swingable in contact with the yoke 2.

  Further, the second free end 32 side of the operating piece 3 is covered with a card 34 made of an insulating material such as a resin. The card 34 includes a protrusion 36 protruding toward the control contact 4 side, and a leaf spring. The latching | locking part 37 for latching and pulling 8 is provided.

  The control contact 4 includes a fixed contact 41 provided on a screen-like body portion T1A of the first fixed terminal T1 formed of a non-magnetic material such as copper and having a good conductivity, and a first fixed terminal. The second fixed terminal T2 made of the same material as T1 is composed of a movable contact 42 provided on the plate spring 8 having an upper end riveted 81. As the material of the fixed contact 41 and the movable contact 42, Ag / Cu, AgCdO / Cu, AgNi / Cu, AgSnO2 / Cu alloy, etc. can be used. It is higher, and the later one has better weldability.

  In the control contact 4, the leaf spring 8 is curved by receiving the pressure of the protrusion 36 formed on the card 34 of the operating piece 3, so that the movable contact 42 comes into contact with the fixed contact 41. A current is passed between the fixed terminal T1 and the second fixed terminal T2.

  That is, the protrusion 36 presses the leaf spring 8 to bring the movable contact 42 into contact with the fixed contact 41 when the free end 31 of the operating piece 3 is attracted by the opening end of the yoke 2 and moves to the closed position. If the energization to the energizing coil 6 is switched and the free end 31 of the operating piece 3 is released from the open end of the yoke 2 and moves to the open position, the pressure on the leaf spring 8 is released accordingly. The movable contact 42 is separated from the fixed contact 41 by the elastic force of the leaf spring 8.

  When the operating piece 3 moves to the open position, the leaf spring 8 is pulled by the locking portion 37 provided on the card 34, so that even when the fixed contact 41 and the movable contact 42 are about to be welded, the movable contact 42 is provided. Can be forcibly separated from the fixed contact 41 to prevent welding.

  The first fixed terminal T1 includes a screen-like main body portion T1A, and a gap B formed in a portion facing the columnar portion T2A of the second fixed terminal T2 is smaller than the gap A with the leaf spring 8. (See FIGS. 1B and 1C).

  On the other hand, the second fixed terminal T2 is formed in an inverted L shape by extending the arm portion T2C in the lateral direction above the one columnar portion T2A. The upper end is fixed, and the columnar portion T2A functions as an electric circuit forming portion for flowing a current to be opened and closed by the relay R.

In the latch type relay R according to the present invention, the extending portion 38 is projected toward the control contact 4 side in the middle of the second free end 32 side of the operating piece 3, so that the energizing coil 6, magnet 9 is leaked to the control contact 4 side.
For this reason, after the arc extension described later is performed with this composite magnetic flux, it acts as a leakage magnetic flux between the second free end 32 and the yoke 2 and attracts the second free end 32 to the yoke 2. To do.

  With such a configuration, in the latching relay R, one side of the first free end 31 and the second free end 32 of the operating piece 3 according to switching of energization to the energizing coil 6 when opening and closing the electric circuit. Can be reciprocated between the open position and the closed position by releasing the other side at the same time as the yoke 2 is sucked. The movement between the closed position and the closed position and the stationary holding operation will be described with reference to the drawings.

  2A and 2B are cross-sectional views for explaining the basic operation of the latch relay R. FIG.

  In the latch type relay R, as described above, the operating piece 3 is reciprocated between the open position and the closed position by switching the energization to the energizing coil 6, but in FIG. FIG. 2B shows a state where the operating piece 3 is in the open position.

  2A, when the operating piece 3 is in the closed position, the protrusion 36 provided on the card 34 covering the operating piece 3 strongly presses the plate spring 8, and is fixed to the plate spring 8. The movable contact 42 and the fixed contact 41 provided on the first fixed terminal T1 are in contact with each other, but the protrusion 36 is also receiving the restoring force of the leaf spring 8, so that this restoring force is activated. It is transmitted to the piece 3 and acts to separate the first free end 31 from the open end of the yoke 2.

  In this state, the magnetic flux ΦM (shown by a solid line) generated from the magnet 9 is generated when the first free end 31 of the operating piece 3 is formed in close contact with the open end of the yoke 2 and the operating piece. 3 and the right loop path forming a large gap between the second free end 32 and the yoke 2 circulates, but the right loop path has a large magnetic resistance due to the gap. , Much of the magnetic flux passes through the left loop path.

Therefore, if the energization of the energizing coil 6 is interrupted, the magnetic force that attracts the open end of the first free end 31 of the operating piece 3 to the yoke 2 overcomes the elastic force of the leaf spring 8, and the operating piece 3 Is held stationary in the closed position.
In this state, when a current is passed through the energizing coil 6, the magnetic flux Φm (shown by a broken line) generated from the energizing coil 6 circulates in the left loop path and the right loop path. Then, the magnetic flux ΦM generated from the magnet 9 and the magnetic flux Φm generated from the energizing coil 6 cancel each other because their directions are opposite to each other. As a result, the first free end 31 of the operating piece 3 is the yoke. 2 is pulled away from the opening end of 2, and the operating piece 3 moves to the open position.

  However, at this time, around the gap between the second free end 32 of the operating piece 3 and the yoke 2, the magnetic flux Φm generated by the energizing coil 6 has the same direction as the magnetic flux ΦM generated from the magnet 9. Therefore, the magnetic flux generated from the magnet 9 is added, and as a result, the second free end 32 of the working piece 3 is attracted to the yoke 2, and this state is maintained from the magnet 9 even after the energization of the energizing coil 6 is cut off. It is held by the generated magnetic flux ΦM (latched in the open position).

  On the other hand, when the operating piece 3 is in the open position, the protrusion 36 provided on the card 34 covering the operating piece 3 does not press the leaf spring 8, and as shown in FIG. The movable contact 42 fixed to the leaf spring 8 and the fixed contact 41 provided on the first energization terminal T1 are separated by the elastic force of the leaf spring 8.

  In this state, the magnetic flux ΦM generated from the magnet 9 is a left loop path having the first free end 31 of the working piece 3 and the open end of the yoke 2, the second free end 32 of the working piece 3, Although it circulates by dividing into a right loop path having a small gap between the yoke 2 and the left loop path has a larger magnetic resistance, most of the magnetic flux passes through the right loop path.

  Therefore, if the energization of the energizing coil 6 is interrupted at this time, the magnetic force for attracting the first free end 31 of the operating piece 3 to the opening end of the yoke 2 causes the second free end 32 of the operating piece 3 to be attracted. Since it is smaller than the magnetic force attracted to the yoke 2, the second free end 32 of the operating piece 3 is attracted to the yoke 2, and the operating piece 3 is held stationary in the open position.

  In this state, when the energizing coil 6 is energized in the opposite direction, the magnetic flux Φm generated by the energizing coil 6 circulates in the left loop path and the right loop path, but in the left loop path, Since the magnetic flux ΦM generated from the magnet 9 and the magnetic flux Φm generated from the energizing coil 6 are added in the same direction, the first free end 31 of the operating piece 3 is attracted to the opening end of the yoke 2. As a result, the operating piece 3 is moved to the closed position. However, if the first free end 31 of the operating piece 3 is attracted to the open end of the yoke 2, the energization of the energizing coil 6 is cut off thereafter. Even so, this state is maintained by the magnetic flux generated by the magnet 9 (latched in the closed position).

  By the way, at the moment when the fixed contact 41 and the movable contact 42 are separated from the state of FIG. 2A, the potential difference between the two rapidly rises due to the inductive component of the circuit. Arc discharge occurs, and the arc current generated in this case is mainly composed of charged particles such as thermoelectrons emitted from the fixed contact 41 and the movable contact 42 and evaporated metal vapor as heat is generated. The fixed contact 41 and the movable contact 42 are consumed.

  However, in this latch type relay R, the middle of the working piece 3 on the second free end 32 side is formed as an extended portion 38 and protrudes toward the control contact 4 side. When the control contact 4 is opened, the magnetic flux ΦM generated from the magnet 9 and the magnetic flux Φm generated from the energizing coil 6 merge and pass through the fixed contact 41 and the movable contact 42. It acts so as to extend the arc perpendicular to the arc generated.

  The direction of arc extension at that time is determined by the direction of the current that the latching relay R opens and closes. In this embodiment, in particular, the current flows from the second fixed terminal T2 side to the first fixed terminal T1 side. Therefore, the arc is stretched in the direction of the columnar portion T2A between the body portion T2A of the first fixed terminal and the leaf spring 8, and moves to the side end of the leaf spring 8, but thereafter As described below, is induced between the first and second fixed terminals T1 and T2, and is further moved by self-induced magnetic flux.

  FIG. 3 is a schematic partial cross-sectional view of the control contact 4 of the latching relay R shown in FIG. 1. The screen-shaped main body T1A of the first fixed terminal T1 and the electric circuit forming portion T2A of the second fixed terminal T2 Only the leaf spring 8 is shown, and other elements are omitted from the drawing.

  The state shown in FIG. 3 is a state immediately after the electric circuit is closed and the control contact 4 through which the current is passed is controlled from the closed state to the open state. At this time, the magnetic flux ΦM generated from the magnet 9 and the energizing coil 6 are generated. The magnetic flux Φm substantially merges in the direction of the center line of the leaf spring 8 and is orthogonal to the arc, and the arc current flows from the movable contact 42 side toward the fixed contact 41 side.

  At the moment when the fixed contact 41 and the movable contact 42 are separated, the vector of the velocity of the charged particles forming the arc and the vectors of the surrounding magnetic fluxes ΦM and Φm cross each other, so that the Lorentz force acting on the charged particles The vector acts as a counterclockwise circular orbit as an outer product of the velocity vector of the charged particle (assuming positive charge) and the vector of the magnetic flux according to Fleming's left-hand rule.

In addition, an electric field between the first fixed terminal T1, the second fixed terminal T2, and the leaf spring 8 acts on the charged particles constituting the arc simultaneously with the Lorentz force. Therefore, under such conditions, the arc generated between the fixed contact 41 and the movable contact 42 (a) is extended in the right direction in the drawing, that is, toward the columnar portion T2A of the second fixed terminal T2. , (B), and after moving to the side end (c) of the first fixed terminal T1 between the partition body portion T1A and the leaf spring 8, the partition body portion T1A of the first fixed terminal T1 Jump to the columnar portion T2A of the second fixed terminal T2 and move to (d).
Here, the movement from (c) to (d) is more than the gap A between the screen-like body portion T1A of the first fixed terminal T1 and the leaf spring 8, and the screen-like body portion T1A of the first fixed terminal T1. This is because the gap B between the first fixed terminal T2 and the columnar portion T2A of the second fixed terminal T2 is reduced.

  FIG. 4 is a diagram in which the first fixed terminal T1 and the second fixed terminal T2 are extracted from FIG. 1C in order to explain the principle of moving the arc by the self-inducing magnetic flux. Elements are given the same reference symbols and are not described.

  In FIG. 4, when the arc is at (d), the current I of the electric circuit to be interrupted still flows through the path of the columnar portion T2A of the second fixed terminal T2, the arc, and the main body portion T2A of the first fixed terminal T1. Thus, a right-handed magnetic flux ΦI is generated around the columnar portion T2A serving as the first electric circuit forming portion.

  Since this magnetic field ΦI causes Lorentz force to act on the charged particles forming the arc of (d) in the same manner as described above, the arc is connected to the screen-shaped main body T1A of the first fixed terminal T1 and the second Along the gap with the columnar portion T2A of the fixed terminal T2, it moves to the upper (e), and further moves upward. In the process, the arc energy is attenuated, and the first fixed terminal T1, The voltage required for maintaining the discharge is insufficient due to reduction of the potential difference between the two fixed terminals T2, bending of the arc discharge due to magnetism, and increase in resistance of the path due to stretching (extinguishing action). Is completely blocked.

  Therefore, in the present invention having such a configuration, as described above, the arc stretched by the action of the leakage magnetic flux causes the screen-like main body portion T2A and the second fixed terminal T2 of the first fixed terminal T1. After moving to the side end of the columnar portion T2A or the leaf spring 8, the stagnation there is effectively prevented from being consumed intensively due to heat generation, and the life of the latch relay R is increased. Let

FIG. 5 shows a modification of the first fixed terminal T1.
For the sake of simplicity, only the first fixed terminal T1, the second fixed terminal T2, and the leaf spring 8 are shown, but the other components not shown are the same as those in the previous embodiment, so the description will be given. Omitted.
In this example, the screen-like main body portion T1A of the first fixed terminal T1 is tapered so that the gap formed in the portion facing the columnar portion T2A of the second fixed terminal T2 gradually becomes narrower as it goes upward. Since the arc is formed in a shape, the arc moves upward as a strong electric field while being affected by the self-induced magnetic flux as described above, thereby further facilitating arc extinction.

FIG. 6 is a diagram showing another shape of the second fixed terminal T2. For the sake of simplicity, only the first fixed terminal T1, the second fixed terminal T2, and the leaf spring 8 are shown, but the other components not shown are the same as those in the previous embodiment, so the description will be given. Omitted.
In this example, the second fixed terminal T2 extends from the lower part of the columnar part T2A serving as the first electric circuit forming part to the columnar part T2D serving as the second electric circuit forming part in the lateral direction, and is formed on the columnar part T2A. It is made to be substantially orthogonal. In the figure, ΦI ′ indicates a magnetic flux generated by the current of the columnar portion T2D.

According to this structure, inside the orthogonal portion of the columnar portions T2A and T2D, the magnetic flux ΦI generated in the first electric circuit forming portion T2A by the above-described self-induced magnetic flux and the magnetic flux ΦI generated in the second electric circuit forming portion T2D. Since ′ is superimposed in the same direction and acts additively on the arc, the upward movement of the arc is further promoted.
The point that the arc moves from (d) to (e), the energy is attenuated and finally disappears is the same as in the previous embodiment.

  FIG. 7 is a view showing still another formation of the second fixed terminal T2. For the sake of simplicity, only the first fixed terminal T1, the second fixed terminal T2, and the leaf spring 8 are shown, but the other components not shown are the same as those in the previous embodiment, so the description will be given. Omitted.

  In the example shown in this figure, the second fixed terminal T2 is formed in an arch shape in which the upper portions of the two columnar portions T2A and T2A are connected by the horizontal portion T2C, and the horizontal portion T2C includes a leaf spring. The upper end 8A of 8 is fixed, and one of the two columnar portions T2A and T2A constitutes a first electric circuit forming portion.

  According to such a configuration, the other of the two columnar portions T2A and T2A does not form an electric circuit, and therefore does not contribute to the movement of the arc. However, since the mechanical strength of the second fixed terminal T2 is improved by such an arch shape, even if the columnar portion T2A on the side that becomes the electric circuit forming portion is consumed by the arc, the entire second fixed terminal T2 There is an advantage that a proper strength is maintained.

(A)-(c) is a schematic sectional drawing of the latch type relay with which this invention was implemented. (A), (b) is a figure explaining the basic operation | movement of the latch type relay by this invention. FIG. 3 is a schematic cross-sectional view of a control contact portion for explaining an arc stretching principle. These are figures which show the 1st fixed terminal and the 2nd fixed terminal which make the principal part of this invention. These are figures which show another shape of the 1st fixed terminal. These are figures which show another shape of the 2nd fixed terminal. These are figures which show another shape of the 2nd fixed terminal.

Explanation of symbols

2 yoke 3 actuating piece 4 control contact 6 energizing coil 8 leaf spring 8A top end of leaf spring 9 magnet 32 second free end 38 extension portion 41 fixed contact 42 movable contact R latch relay T1 first fixed terminal T1A partition Main body part T2 second fixed terminal T2A first electric circuit forming part T2C arm part, horizontal part T2D second electric circuit forming part A, B gap

Claims (6)

An operation that moves between an open position and a closed position when it is attracted to and released from one end of the yoke by winding the current coil and incorporating a magnet and switching the current to the current coil. And a control contact that opens and closes the current by moving the movable contact that receives the movement of the operating piece to and from the fixed contact, moves the operating piece to the open position, opens the control contact, and Is interrupted by guiding a part of the magnetic flux generated in the yoke by the energizing coil to the control contact side as a leakage magnetic flux superimposed on the magnetic flux of the magnet. A latch relay that extends the arc generated during the period to the side end of the leaf spring and extinguishes the arc.
The fixed contact is provided on a first fixed terminal having a screen-like main body, and the movable contact is provided on a leaf spring that is pressed by the movement of the operating piece to contact the fixed contact. And the upper end of the leaf spring is connected to the second fixed terminal,
The second fixed terminal has a first electric circuit forming part that extends upward and forms an electric circuit parallel to the longitudinal direction of the leaf spring, and the first electric circuit forming part and the first fixed terminal A latch-type relay characterized in that a gap between the screen-like main body portion is formed to be smaller than a gap between the leaf spring and the screen-like main body portion of the first fixed terminal. In claim 1,
The latch type relay in which the second fixed terminal has a structure in which a second electric circuit forming portion that is substantially orthogonal to the first electric circuit forming portion is further extended below the first electric circuit forming portion. In claim 1 or 2,
The screen-like main body portion of the first fixed terminal has a tapered shape so that a gap formed in a portion of the second fixed terminal facing the first electric circuit forming portion is gradually narrowed toward the upper side. Latch-type relay formed on. In Claims 1-3,
The operating piece has an extending portion that protrudes toward the control contact side, and has a shape that causes a part of the combined magnetic flux generated by the energizing coil and the magnet to leak to the control contact side through the extending portion. Latching relay. In any one of Claims 1-4,
The second fixed terminal is formed in an inverted L shape by extending an arm part on top of one columnar part, and the upper end of the leaf spring is fixed to the arm part. A latch-type relay in which the columnar portion constitutes the first electric circuit forming portion. In any one of Claims 1-4,
The second fixed terminal is formed in an arch shape in which upper portions of two columnar portions are connected by a horizontal portion, and the upper ends of the leaf springs are fixed to the horizontal portion, and the two columnar portions are A latch-type relay, one of which constitutes the first electric circuit forming unit.

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