JPH0646529B2 - Switch with operation confirmation light - Google Patents

Description

The present invention relates to a switch with an operation confirmation light, which is used in an AC circuit and has an operation confirmation light that lights up when energized.

[Prior Art] Conventionally, as a switch with an operation confirmation lamp of this kind, an energization state is detected by a current transformer, and an operation confirmation lamp such as a light emitting diode connected to a secondary winding of the current transformer is blinked. What you have done is provided.

The current transformer used in such an operation confirmation light switch is generally formed by winding a primary winding and a secondary winding around an annular core formed of ferrite.

[Problems to be Solved by the Invention] By the way, since ferrite has a relatively small saturation magnetic flux density, the minimum current in the change range of current is large when the change width of the input current flowing in the primary winding is wide. If the number of turns of the primary winding is set so that the operation confirmation light is turned on, magnetic saturation occurs in the core by the maximum current in the change range. On the other hand, if the maximum current is dealt with, a predetermined output current cannot be obtained at the minimum current, and the operation confirmation lamp does not light up. Therefore, there is a problem that the variation width of the input current that can be passed through the primary winding cannot be made large, and as a result, the application of the switch is limited.

In order to improve the saturation magnetic flux density, there is a current sensor that uses permalloy for the core, but when using permalloy at high magnetic flux density, iron loss increases, so there is a problem of heat generation, and eventually the magnetic flux density becomes large. Cannot be done and the maximum current will be limited.

That is, the passing current to the contact is limited, and the application is limited.

An object of the present invention is to solve the above problems, and an object of the present invention is to provide a switch with an operation confirmation light in which the change width of the passing current to the contact can be wide so that the usage is not limited. Is.

[Means for Solving the Problems] In the present invention, in order to achieve the above object, a current transformer, an annular core, a primary winding wound around the core so as to be inserted into the core, and a secondary winding 2 are provided. Secondary winding, core, primary winding and 2
The secondary winding is composed of a primary winding, a secondary winding, and a synthetic resin covering that molds the connection between the lead wire and the lead wire, and the core is formed in a cylindrical shape at both ends in the axial direction. A bobbin made of a non-magnetic material with a disk-shaped flange, and a thin strip of amorphous magnetic material having a width that approximately matches the axial length of the bobbin are wound around the bobbin in multiple layers. The outermost layer is formed of a core body whose outer peripheral edge substantially matches the outer peripheral edge of the flange, and a bobbin and a synthetic resin coating layer which covers the core body and has a smooth outer peripheral shape of a cross section including the central axis of the bobbin. Is formed by a pair of halves having a shape in which a flange is provided at one end of a cylindrical cylinder shaft, and the two halves are joined by press fitting the cylinder shaft of one half body into the cylinder shaft of the other half body. Is there.

[Operation] According to the above configuration, since the core of the current transformer is formed of the non-magnetic bobbin and the strip of the amorphous magnetic material wound around the bobbin, when the ferrite core is used. By comparison, the saturation magnetic flux density can be increased, and the output current can be obtained with good linearity from the minimum current to the maximum current even if the change width of the input current is large. Further, the amorphous magnetic substance may have a lower saturation magnetic flux density than that of permalloy, but if iron loss is taken into consideration, it can be effectively used at a higher magnetic flux density than permalloy, and the maximum current Can be large.

In addition, since the bobbin and the core body are covered with the synthetic resin coating layer, the insulation characteristics can be improved, and moreover,
It is possible to prevent stress from being generated in the core body when winding the primary winding or the secondary winding, and to stabilize the magnetic characteristics.

[Embodiment 1] As shown in FIG. 4, a current transformer 10 is provided in a body 30.
And a contact mechanism section are built in, and an operation confirmation lamp 41 composed of a light emitting diode is connected to the current transformer 10 as shown in FIG. The body 30 is shown in FIG. 1 and FIG.
As shown in the figure, a body 31 and a cover 32 fitted on the body 31 are formed by being joined by an assembly frame 33.
The outer shape of the body 30 is set to a size corresponding to one implantable wiring device that can be detachably attached to a mounting frame standardized by the Japan Wiring Equipment Manufacturers Association. As shown in FIG. 3, a mounting claw 34 serving as a mounting portion for a synthetic resin mounting frame and a mounting hole 3 serving as a mounting portion for a metal mounting frame.
And 5 are formed on the assembly frame 33. A handle 36 is swingably held by the cover 32, and the handle 3
A printed circuit board 42 on which an operation confirmation lamp 41 is mounted is fixed to 6. The operation confirmation light 41 is exposed on the operation surface of the handle 36, a handle cover 37 is fitted on the operation surface, and the blinking state of the operation confirmation light 41 can be confirmed through the handle cover 37.

Terminals 40a and 40b are installed at both ends of the body 31, and each of the terminals 40a and 40b is formed in a substantially U-shape and is oriented toward the terminal plates 43a and 43b. Locking springs 44a and 44b having spring force
And a release button 45a, 45b that presses the lock springs 44a, 44b in a direction to pull them away from the terminal plates 43a, 43b by applying an external force. Therefore, by inserting an electric wire through the electric wire insertion holes 46a and 46b formed in the bottom surface of the body 31, the electric wire is sandwiched between the terminal plates 43a and 43b and the locking springs 44a and 44b to perform connection. The electric wire can be pulled out by pushing the release buttons 45a and 45b from the bottom surface of 31 with a driver or the like. The fixed contact 47 is provided on one of the terminal plates 43a, and the fixed contact 47
A movable contact 49 provided on a substantially U-shaped mover 48 opened upward is opposed to this. The lower surface of the mover 48 is swingably supported on a fulcrum 50a provided on the support terminal plate 50, and the moveable contact 49 separates from and contacts the fixed contact 47 as the mover 48 swings. A reversing spring 51 is held between the mover 48 and the handle 36, and the mover 48 swings with a dead point at which the reversing spring 51 is most compressed as the handle 36 swings. The mover 48 performs a so-called snap operation and instantaneously reverses.

By the way, the operation confirmation lamp 41 described above is used for the current transformer 10.
Is connected to the secondary winding 3. The current transformer 10 is the fourth
As shown in the figure, it is housed inside the body 31 on the side of the mover 48. One end of the primary winding 2 of the current transformer 10 is connected to the support terminal plate 50, and the other end is connected to the terminal plate 43b. Therefore, the circuit configuration shown in FIG. 5 is obtained, and when the movable contact 49 is inserted in the AC circuit.
Contact the fixed contact 47 and the contact r is closed, the operation confirmation lamp 41 is turned on, and when the contact r is opened, the operation confirmation lamp 41 is turned off. The off state can be confirmed by blinking the operation confirmation lamp 41.

By the way, as shown in FIG. 6, the core 1 of the current transformer 10 includes a bobbin 12 formed of a non-magnetic material in a tubular shape and provided with flanges 11 at both ends in the axial direction, and a thin wall of an amorphous magnetic material. It is formed by a core body 14 in which the strip 13 is wound around the bobbin 12 in multiple layers, and a synthetic resin coating layer 15 that covers the bobbin 12 and the core body 14.

The bobbin 12 may be integrally formed of synthetic resin or the like, but as shown in FIG. 7, it is preferable that the bobbin 12 is formed by joining a pair of halves 12a and 12b. That is, each half 12
The a and 12b are formed by processing a sheet metal of a non-magnetic material such as brass, and are formed in a shape having a flange 11 at one axial end of the cylindrical cylinder shafts 16a and 16b. The inner diameter of the cylinder shaft 16a of the one half body 12a is set to be substantially equal to the outer diameter of the cylinder shaft 16b of the other half body 12b, and by pressing the cylinder shaft 16b into the cylinder shaft 16a,
As shown in FIG. 7 (b), both halves 12a and 12b are joined to form the bobbin 12.

For the bobbin 12 formed as described above, the eighth
As shown in FIGS. 9 and 9, a thin strip 13 of amorphous magnetic material is wound. The width of the strip 13 is set to be substantially equal to the distance between the flanges 11 of the bobbin 12, and the winding start end is fixed to the bobbin 1 by a start end fixing tape 17 made of a heat-resistant adhesive tape such as a polyimide film tape.
Fixed to 2. Further, after winding the strip 13 into the number of layers, the end portion of the winding end is fixed by the terminal fixing tape 18 of the heat resistant adhesive tape. By using the starting end fixing tape 17, the bobbin 12 and the strip 13 are brought into close contact with each other, and the strip 1
It is possible to prevent the bobbin 12 from being lifted up by the bending stress of No. 3. Further, by using the end fixing tape 18, it is possible to prevent the winding end from being turned up. As a result, the core body 1 formed by the strips 13
The space factor of 4 increases. 1 strip on bobbin 12
After winding 3, the product is annealed in a magnetic field (390 ° C. for 2 hours).
As a result, the internal stress of the strip 13 which is an amorphous magnetic material is removed. Further, since the bobbin 12 is formed of a non-magnetic metal and the heat-resistant adhesive tape is used for fixing the strip 13, there is no problem in heat resistance during annealing. As described above, since the non-magnetic material is used for the bobbin 12, the magnetic characteristics of the core 1 are determined by the magnetic characteristics of the core body 14, and since the core body 14 is an amorphous magnetic material, the saturation magnetic flux density Also, the magnetic permeability is large and the iron loss is small.

The bobbin 12 and the core body 14 are covered with a synthetic resin coating layer 15 over the entire circumference. Coating layer 1
5 is several tens to several hundreds μm of synthetic resin such as polyamide
It is formed by a powder body having a particle size of. As a result of using the powder body of the synthetic resin, the resin does not penetrate between the layers of the strip 13 and the magnetic characteristics are not deteriorated. In addition, since the core body 14 is formed by winding the strip 13 around the metal bobbin 12 as described above, it is possible to prevent stress from being generated in the strip 13 when the coating layer 15 is formed, and the coating layer 15 is formed. It is possible to prevent the change in the magnetic characteristics of the core body 14 due to the molding of 15. Here, the coating layer 15
The outer peripheral surface of is formed to be a smooth curve that does not form an edge in a cross section including the central axis of the bobbin 12.

As shown in FIG. 10, the primary winding 2 and the secondary winding 3 are wound around the core 1 formed as described above so as to be inserted into the center hole of the core 1. Primary winding 2 is secondary winding 3
It has a diameter about 10 times larger than that of the above and is wound for several turns. Since the coating layer 15 is formed here, no stress is generated in the core body 14 when the primary winding 2 and the secondary winding 3 are wound. In addition, since the coating layer 15 has no edge as described above, the primary winding 2 and the secondary winding 3 are not damaged, and the insulating property with respect to the bobbin 12 and the core body 14 is maintained. . By the way, as shown in FIG. 6 (f), the coating layer 15 is provided with projections 15a on both end surfaces in the axial direction of the core 1, and each projection 15a is formed on the end surface of the core 1. Holding groove 15 along
The end portion of the secondary winding 3 in which b is formed is inserted into the holding groove 15b and, as shown in FIG. 6 (a), is coated on the coating layer 15 by the hot melt adhesive 21. It is fixed. Further, a lead wire 4 having an insulating coating is connected to the secondary winding 3. The lead wire 4 has a core wire made of a braided wire, and the end connected to the secondary winding 3 is flattened as shown in FIG. The disengagement is prevented. Further, as shown in FIG. 6 (d), a holding recess 22 is formed at the tip portion, and the end of the secondary winding 3 is overlapped with the holding recess 22 so that the secondary winding 3
And the lead wire 4 are welded together. After the connection between the secondary winding 3 and the lead wire 4 is completed, this joint portion is fixed to the coating layer 15 by the hot-melt adhesive 23. In this way, by fixing the coupling portion between the secondary winding 3 and the lead wire 4 to the coating layer 15, the secondary winding 3
The insulation distance between both ends of the
Can be prevented from acting on the secondary winding 3, and disconnection of the relatively thin secondary winding 3 can be prevented.

After the primary winding 2 and the secondary winding 3 are wound around the core 1, they are molded with a synthetic resin coating 5 as shown in FIG. By molding the core 1, the primary winding 2, and the secondary winding 3 with the cover 5 in this manner, disconnection of the root of the lead wire 4 can be prevented, and an impact from the outside can prevent an external impact.
Therefore, the magnetic characteristics of the core body 14 can be prevented from being affected. An ultraviolet curable resin is used as the cover 5. Therefore, the time required for processing is shortened,
This shortens the molding cycle and improves productivity.
Further, since heating is not required for molding, the magnetic characteristics of the core body 14 are not affected.

By using the current transformer 10 having the above-described configuration, it is possible to increase the variation width of the current flowing through the primary winding 2, and it is possible to reduce the restrictions on the intended use.

[Embodiment 2] In the above-mentioned embodiment, the contact was constituted by one circuit and one contact.
In this embodiment, the contacts are one circuit and two contacts. That is, as shown in FIG. 12 and FIG. 13, the terminal plate 43a in the first embodiment is divided into two, and the terminal plates 43a ₁ and 4 are
3a _2, and the mover 48 is disposed between the fixed contacts 47 ₁ and 47 ₂ provided on both terminal plates 43a ₁ and 43a ₂ , respectively. Both fixed contacts 4 are attached to the mover 48.
7 _1, 47 movable contacts 49 _1, respectively ₂ to the corresponding, 49 ₂ are provided, one of the movable contacts 49 _1, 49 ₂
Are in contact with the corresponding fixed contacts 47 ₁ and 47 ₂ .

The current transformer 10 has a support terminal plate 5 at the bottom of the body 31.
It is arranged below 0, and as shown in FIG.
One end of the next winding 2 is connected to the support terminal board 50, and the other end is connected to the terminal board 43b. An operation confirmation lamp 41 is connected between both ends of the secondary winding 3. As described above,
As shown in FIG. 15, a circuit configuration in which the current transformer 10 is connected to the common contact of the contacts r of the two contacts of one circuit can be obtained, and a three-way switch with an operation confirmation lamp can be obtained.

[Embodiment 3] In this embodiment, the two circuits are configured as so-called four-way switches that can be selected from a state in which both circuits are connected to the same circuit and a state in which they are connected to other circuits. As shown in FIGS. 16 and 17, the body 3
0 is set to the size of two wiring devices that can be mounted on the mounting frame standardized by the Japanese Wiring Device Manufacturers Association. Terminal board 43a and terminal board 43b in the first embodiment
Are divided into two parts, and terminal plates 43a ₁ , 43a ₂ , 4
3b _1, 43 b ₂ is formed, the fixed contacts 47a _1, 47a ₂ are provided on the terminal plate 43a _1, 43a _2. In addition, the fixed terminal plate 52 is opposed to the terminal plates 43a ₁ and 43a _2.
1 , 52 ₂ are provided, and each fixed terminal plate 52 ₁ , 52 ₂
Are provided with fixed contacts 47b ₁ and 47b ₂ , respectively. Fixed contacts 47a ₁ , 47b ₁ , 47 facing each other
Movable elements 48 ₁ and 48 ₂ are arranged between a ₂ and 47 b ₂ , respectively. The terminal plate 43a ₁ is connected to the fixed terminal plate 52 ₂ , and the terminal plate 43a ₂ is connected to the fixed terminal plate 52 ₁ . The movers 48 ₁ and 48 ₂ are swingably arranged on the support terminal plates 50 ₁ and 50 ₂ , respectively.

By the way, two current transformers 10 ₁ and 10 ₂ are provided, and they are disposed on the side of the contact. As shown in FIG. 18, one ends of the primary windings 2 of the current transformers 10 ₁ and 10 ₂ are connected to the terminal plates 43b ₁ and 43b ₂ , respectively, and the other ends thereof are supported terminal plates 50 ₁ and 50 ₂ , respectively. Connected to ₂ . Also,
As shown in FIG. 19, the secondary windings 3 of the current transformers 10 ₁ and 10 ₂ are commonly connected and connected to both ends of the operation confirmation lamp 41. By this connection, as shown in FIG.
Thus, a circuit configuration having a four-way switching contact r capable of switching the circuit between so-called straight and cross is obtained.

FIG. 21 shows a pilot lamp that can be attached to the mounting frame, and the current transformer 10, the operation confirmation lamp 41, and the terminal portion 40 are installed in the body 30. That is,
Since the terminal portions 40a and 40b similar to those of the first embodiment are installed in the body 30, the primary winding 2 of the current transformer 10 is inserted between the both terminal portions 40a and 40b. Further, the operation confirmation lamp 41 is provided on the secondary winding 3 of the current transformer 10.
Are connected to form a circuit configuration as shown in FIG.
A translucent cover 38 is provided at a portion of the body 30 corresponding to the operation confirmation lamp 41, and the terminal portions 40a and 40b are provided.
When alternating current is energized in the meantime, the operation confirmation lamp 41 is turned on and the blinking of the operation confirmation lamp 41 can be confirmed through the translucent cover 38.

[Advantages of the Invention] As described above, according to the present invention, the current transformer includes the annular core, the primary winding and the secondary winding wound around the core so as to be inserted into the core, the core and the primary winding. The secondary winding and the secondary winding are composed of a primary winding, and a synthetic resin coating that molds the connection between the secondary winding and the lead wire. The core is formed into a cylindrical shape and the shaft is formed. A bobbin made of a non-magnetic material having disc-shaped flanges at both ends in the direction, and a plurality of thin-walled strips of an amorphous magnetic material having a width substantially matching the axial length of the bobbin are provided on the bobbin. A core body formed by winding layers, the outermost layer of which is substantially aligned with the outer peripheral edge of the flange, and a coating layer of a synthetic resin, which covers the bobbin and the core body and has a smooth outer peripheral shape of a cross section including the central axis of the bobbin. And a bobbin with a flange on one end of a cylindrical cylinder shaft. And the cylinder shaft of one half body is press-fitted into the cylinder shaft of the other half body to connect the two half bodies, and the core of the current transformer is composed of a non-magnetic bobbin and a bobbin. Since it is formed with a strip of amorphous magnetic material wound around, the saturation magnetic flux density can be made larger compared to the case where a ferrite core is used, and even if the change width of the input current is large, it can be minimized. The output current can be obtained with good linearity from the current to the maximum current. Further, the amorphous magnetic substance may have a lower saturation magnetic flux density than that of permalloy, but if iron loss is taken into consideration, it can be effectively used at a higher magnetic flux density than permalloy, and the maximum current There is an advantage that can be taken large.

Further, since the bobbin and the core body are covered with the synthetic resin coating layer, the insulating property can be improved, and
It is possible to prevent stress from being generated in the core body when winding the secondary winding or the secondary winding, and to stabilize the magnetic characteristics. Moreover, since the coating layer has a smooth outer peripheral shape of the cross section including the central axis of the bobbin,
This has an advantage that the primary winding and the secondary winding are less likely to be broken when the primary winding and the secondary winding are wound around the core.

As a result, the magnitude of the electric current that can be passed through the contacts is not limited by the performance of the current transformer, and the limitation of the usage is reduced. Further, in forming a bobbin having flanges on both ends of a cylinder, half halves each having a flange on one end of a cylindrical cylinder shaft are connected to each other. Has the advantage of facilitating manufacturing by using a half shape that can be easily made, and the covering body is formed so as to cover the connection portion between the primary winding and the secondary winding and the lead wire. Therefore, there is an advantage that it is possible to prevent disconnection at the root portion of the lead wire having a relatively small strength.

[Brief description of drawings]

FIG. 1 is a sectional view showing Embodiment 1 of the present invention, FIG. 2 is a side view of the same as above, FIG. 3 is a plan view of the same as above, FIG. 4 is a plan view with the cover above open, and FIG. Circuit diagram of the above, FIG. 6 (a)
(F) is a cross-sectional view showing a current transformer used in the same as above, a vertical cross-sectional view, an enlarged cross-sectional view of a main part, a side view taken along line XX in (a), and (Y) in (a). -Y line sectional view, the same figure (a)
Middle ZZ line sectional view, FIG. 7 (a) (b) is an exploded perspective view showing a bobbin used in the current transformer, respectively, a perspective view after assembly,
8 to 11 are process diagrams showing respective steps of the same manufacturing process, FIG. 12 is a sectional view showing a second embodiment of the present invention, FIG. 13 is a plan view showing the same cover open, and FIG. FIG. 15 is a side view of an essential part of the same, FIG. 15 is a circuit diagram of the same, FIG. 16 is a cross-sectional view showing a third embodiment of the present invention, FIG. 17 is a plan view of the same cover opened, and FIG. 19 is a perspective view of an essential part of the same.
FIG. 20 is a perspective view of an essential part of the above, FIG. 20 is a circuit diagram of the above, and FIG.
FIG. 1 is a sectional view showing a pilot lamp using a current transformer, and FIG. 22 is a circuit diagram of the same. 1 ... Core, 2 ... Primary winding, 3 ... Secondary winding, 4 ... Lead wire, 5 ... Cover, 11 ... Flange, 12 ... Bobbin, 12
a, 12b ... Half body, 13 ... Strip, 14 ... Core body, 15
... Coating layer, 16a, 16b ... Cylindrical shaft, 43a, 4
3b ... Terminal board, 47 ... Fixed contact, 48 ... Mover, 49 ...
Movable contact.

Claims (4)

[Claims] 1. A contact inserted into an AC circuit, a current transformer connected so that an AC current flows through a primary winding when the AC circuit is energized, and an AC circuit connected to a secondary winding of the current transformer. In an operation confirmation light switch including an operation confirmation lamp that lights up when electricity is applied to the current transformer, the current transformer includes an annular core, a primary winding wound around the core so as to be inserted into the core, and a secondary winding. The core is composed of a secondary winding, a core, a primary winding, and a secondary winding, and a synthetic resin covering that molds the primary winding and the connection between the secondary winding and the lead wire. , A bobbin made of a non-magnetic material having a cylindrical shape and having disk-shaped flanges at both ends in the axial direction, and a thin wall of an amorphous magnetic material having a width substantially matching the axial length of the bobbin. The outermost layer is formed by winding a plurality of strips around a bobbin, and the outermost layer is formed on the outer peripheral edge of the flange. The bobbin is provided with a flange on one end of the cylindrical cylinder axis, which consists of a core body and a bobbin and a synthetic resin coating layer that covers the core body and has a smooth outer peripheral shape of the cross section including the central axis of the bobbin. A switch with an operation confirmation light, which is formed by a pair of halves having a different shape, and is joined by press-fitting the cylinder shaft of one half body into the cylinder shaft of the other half body. . 2. The switch with an operation confirmation light according to claim 1, wherein the contact is one circuit and one contact, and the primary winding of the current transformer is inserted in series with the contact. 3. The switch with an operation confirmation light according to claim 1, wherein the contacts are two contacts of one circuit, and one end of a primary winding of the current transformer is connected to a common contact. 4. The contact has a four-path configuration for selecting a state in which two circuits are connected to the same circuit and a state in which they are connected to each other, and a pair of current transformers are provided and each circuit is provided with each current. The primary winding of the transformer is inserted,
An operation confirmation light switch according to claim 1, wherein an operation confirmation light is commonly connected to the secondary windings of the respective current transformers.