JPH048892B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switch mechanism using a reed switch.

[Conventional technology]

Conventionally, reed switches operate only when a predetermined magnetic force is applied, so when providing a holding circuit function, a complex electric circuit such as a self-holding circuit using an electromagnetic relay or a flip-flop circuit is added. In addition, a special reed switch is used to make the reed switch perform a contact operation and a contact b operation.

[Problem that the invention seeks to solve]

According to conventional reed switches, as mentioned above, when a reed switch is used to function as a holding circuit, a complicated electric circuit must be added, which makes the circuit complicated and increases costs. , Also, in order to make the A contact operation and the B contact operation with one reed switch,
There is a problem in that the type of reed switch must be changed.

In addition, since the sensitivity to magnetic force is not high, there is a problem that it does not respond to weak magnetic force.

[Means for solving problems]

This invention was made in view of the above problem, and in a switch mechanism configured to switch the contacts of a reed switch to [ON] or [OFF] using the magnetic force of a magnet, one side of the reed switch 2 is connected to the reed switch. One fixed magnet 1 is provided on the axial extension of the lead wire of the switch 2, and two opposing rotating magnets 3 are installed on the other side of the reed switch 2 at positions slightly deviated from the axial extension. . By this, the same poles of the two rotating magnets 3 and 4 are directed in the same direction, and the contact point of the reed switch 2 is turned [ON] by the combined magnetic field of the fixed magnet 1 and the two rotating magnets 3 and 4. By operating the rotary drive means 5 to the OFF side, the same poles of the two rotary magnets 3 and 4 are directed in a direction opposite to the direction described above, and the fixed magnet 1 and the two rotary magnets are rotated. A measure was taken to configure the contact point of the reed switch 2 to be turned [OFF] by the combined magnetic field of 3 and 4.

Further, the rotation drive means 5 may be an operating magnet 5 that magnetically acts on the rotation magnets 3 and 4.

[Effect]

In the switch mechanism using a reed switch according to the present invention, one fixed magnet 1 is provided on one side of the reed switch 2, and two rotating magnets 3 and 4 facing each other are placed on the other side of the reed switch 2 to create a mutual magnetic field. Due to their mutually influencing magnetic fields, the rotating magnets 3, 4 are oriented in the same direction and form a single combined magnet. The direction of the magnetic field of this combined magnet is stabilized either in the direction of the line connecting the two magnets 3 and 4 or in the opposite direction.

The magnetic field combined by the fixed magnet 1 and the two magnets 3 and 4 at the position of the reed switch 2 changes depending on the direction of the combined magnetic field of the magnets. In particular, depending on the magnitude of the magnetic field component in the direction of the lead wire of the reed switch 2 in the combined magnetic field, the contact of the reed switch 2 is switched to be [ON] or [OFF]. .

That is, if the direction of the magnet combined by the two magnets 3 and 4 and the direction of the fixed magnet 1 are as shown in FIG. 1, then at the position of the reed switch 2, Among the magnetic fields combined by the fixed magnet 1 and the two magnets 3 and 4, the magnetic field component in the direction of the lead wire of the reed switch 2 is canceled out and becomes small, and the contact point of the reed switch 2 Since it is not possible to turn on [ON], the contact point of this reed switch 2 is set to [OFF].

On the other hand, if the direction of the magnet combined by the two magnets 3 and 4 and the direction of the fixed magnet 1 are as shown in FIG. is arranged slightly offset from the extension line of the lead wire of the reed switch 2, so that the fixed magnet 1 and the two magnets 3 and 4 at the position of the reed switch 2 Among the combined magnetic fields, the magnetic field component in the direction of the lead wire of the reed switch 2 is slightly larger than in the above state, and the contact point of the reed switch 2 is turned [ON].

In this way, the contact point of this reed switch 2 is
Stable in either [ON] or [OFF] state.

Therefore, a rotary drive means 5 capable of rotating the rotary magnets 3 and 4 is provided, and as shown in FIG. When the magnet is moved from the state shown in FIG. 2 to the ON side shown in FIG. From there, the state is reversed to the direction shown in FIG. 3 via the state shown in FIG.

In the state shown in FIG. 3, the contact of the reed switch 2 is switched to [ON] as described above, and the device is stabilized in that state.

To switch the reed switch 2 to [OFF], operate the rotary drive means 5 from the state shown in FIG. 3 and move it through the state shown in FIG. 2 to the OFF side shown in FIG. 1. The orientation of the magnets combined by the two rotating magnets 3 and 4 is reversed from the state shown in FIG. 3 to the state shown in FIG. 2 to the direction shown in FIG. 1.

In the state shown in FIG. 1, the contact of the reed switch 2 is switched to [OFF] as described above, and the device is stabilized in that state.

In this way, this reed switch 2 can be operated by operating the rotation drive means 5.
It can be switched to either [ON] or [OFF],
It is stable in that state.

Furthermore, when an operating magnet 5 is used as the rotational driving means, the magnetic field of the operating magnet 5 causes the reed switch 2 to move as shown in FIG.
During the transition period when the contact point is switched, the contact state is kept [ON], so bouncing of the contact point is prevented.

〔Example〕

Below, the principle of a switch mechanism using a reed switch according to the present invention will be explained based on FIGS. 1, 2, and 3.

In FIGS. 1, 2, and 3, two rotary magnets are rotatably provided, and a stationary magnet 1 has, for example, an N pole fixed opposite to a reed switch 2. Among the rotating magnets, the one closer to the reed switch 2 is used as a switching magnet 3, and the other one is used as a holding and stabilizing magnet 4.

Here, when the operation magnet 5, which is an external magnet serving as a rotational drive means, is not close to each other, that is, when it is stable, the different poles of the two magnets are always facing each other. Since the switching magnet 3 is installed slightly offset from the extension line of the fixed magnet 1 and the reed switch 2, when the switching magnet 3 is stable as described above, one of the magnetic poles of the switching magnet 3 is close to the reed switch 2. ing. For example, if the N pole of the switching magnet 3 is close to the reed switch 2, the lines of magnetic force at the N pole of the fixed magnet 1 and the lines of magnetic force at the N pole of the switching magnet 3 repel within the reed switch 2, causing the reed switch to close. 2 becomes [OFF]. For example, if the S pole of the switching magnet 3 is close to the reed switch 2, the lines of magnetic force of the fixed magnet 1 and the switching magnet 3 may
The directions of the lines of magnetic force match and the reed switch 2 is turned [ON].

The above-mentioned state of the reed switch 2 is stably maintained against external disturbances by attracting the different polarities of the switching magnet 3 and the holding and stabilizing magnet 4 to each other.

When reed switch 2 is in the [OFF] state (first
), the N pole of the operation magnet 5, which has a sufficiently strong magnetic force compared to the three magnets mentioned above, is held by the stable magnet 4.
When approached from the side, the S poles of the stable switching magnet 3 and the stable holding magnet 4 are attracted to the N pole of the operating magnet 5, and are rotated as the operating magnet 5 moves. 5 approaches the switching magnet 3 (Fig. 2), the N poles of the operating magnet 5 and the switching magnet 3 both face the direction of the reed switch 2, so the reed switch resists the magnetic force of the fixed magnet 1. Turn 2 [ON]. After that, when the operating magnet 5 passes close to the switching magnet 3 (Fig. 3), the switching magnet 3 is rotated more than 90 degrees, so when the operating magnet 5 is separated, the switching magnet The magnet 3 and the stable holding magnet 4 are rotated 180 degrees from the stable holding state shown in FIG. 2, and the south pole of the switching magnet 3 is closer to the reed switch 2 than the south pole of the reed switching magnet 3. Therefore, within the reed switch 2, the lines of magnetic force of the fixed magnet 1 and the lines of magnetic force of the switching magnet 3 match, and the reed switch 2 is turned [ON].
This state will be maintained. At this time, the reed switch 2 operates as an a contact switch.

Continuing from this state, when the operating magnet 5 passes close to the close holding and stabilizing magnet 4 from the switching magnet 3 side, the reed switch 2 changes from [ON] to [OFF], and when the operating magnet 5 leaves, That state is maintained.

Next, when the reed switch 2 is [ON] and in a stable holding state, when the S pole of the operating magnet 5 approaches from the stable holding magnet 4 side, the switching magnet 3 and the stable holding magnet 4 are connected to the operating magnet 5. When the operating magnet 5 passes close to the switching magnet 3, the switching magnet 3 and the stable holding magnet 4 are rotated 180 degrees from the stable holding state, and the switching magnet Since the N pole of net 3 approaches reed switch 2, reed switch 2
becomes [OFF] and maintains that state. At this time, the reed switch 2 operates as a b contact switch.

When in a stable holding state, the different polarities of the switching magnet 3 and the stabilizing holding magnet 4 attract each other, so the magnet is stable and less susceptible to disturbances such as vibrations, making it difficult to malfunction.

Further, even when the magnetic force from the operating magnet 5 is weak, the switching magnet 3 and the stable holding magnet 4 relay the magnetic force of the operating magnet 5, so the sensitivity of the switch mechanism using the reed switch is good.

Furthermore, the reed switch 2 can also be operated by mechanically rotating the holding and stabilizing magnet 4 with an operating lever serving as a rotational drive means, so the reed switch mechanism can be operated even without the operating magnet 5. Applicable to limit switches.

Further, by adjusting the installation interval between the switching magnet 3 and the holding and stabilizing magnet 4, the sensitivity of the switch mechanism by the reed switch can be adjusted.

Next, an embodiment in which the reed switch mechanism according to the present invention is applied to a liquid level switch will be described with reference to FIG.

A liquid level switch 6 using a switch mechanism using a reed switch according to the present invention is fixed to the outer surface of a tank 7 made of a non-magnetic material, and has a built-in operating magnet 8 for operating the liquid level switch 6 using the reed switch. A float 9 is floating on the liquid level on the inner surface of the tank 7.

The liquid level switch 6 using the reed switch is composed of a fixed magnet 1, a reed switch 2, a switching magnet 3, and a stable holding magnet 4. The N pole of the fixed magnet 1 faces the reed switch 2, and the The N pole of the operating magnet 8 is set so as to face the liquid level switch 6 operated by the reed switch.

When the liquid level is at the L1 level, the reed switch 2 is turned [ON] due to the influence of the operating magnet 8 of the float 9, and when the liquid level rises above the L1 level (L2), the reed switch 2 is turned [ON]. The liquid level is maintained as it is, and the full water indicator light 11 of the liquid level display device 10 is turned on.

Next, when the liquid level falls and passes the level of L1 (L3), the reed switch 2 is turned OFF, and the full water indicator light 11 of the liquid level display device 10
is turned off.

When the liquid level rises again and passes the level of L1 (L2), the reed switch 2 is turned [ON] and the full water indicator light 11 of the liquid level display device 10 is lit again.

In addition, when the liquid level is sufficiently higher or lower than the level of L1, the operating magnet 8 is separated, so the switching magnet 3 and the holding and stabilizing magnet 4 attract each other, and the state at that time is maintained. Since the reed switch 2 is stable, the contacts of the reed switch 2 are not affected by slight vibrations and operate stably.

Furthermore, since the liquid level switch 6 using the reed switch according to the present invention is highly sensitive, the magnetic force from the operating magnet 8 may weaken due to deterioration of the operating magnet 8, or the magnetic force from the operating magnet 8 may be attenuated due to the thickness or material of the tank 7. The liquid level switch 6 operates stably even if

Furthermore, since it uses a reed switch,
It is easy to maintain and can be used safely even in hazardous atmospheres containing flammable gases.

〔effect〕

The switch mechanism using the reed switch according to the present invention can hold the contact without an electric circuit such as a relay, and can also function as an a contact or a b contact with the same switch, so the reed switch can perform the above-mentioned advanced functions. The switch mechanism has a simple structure and can be made at low cost.

In addition, when operating the switch mechanism using the reed switch according to the present invention using an external operation magnet, the two rotating magnets relay the magnetic field of the external magnet and transmit it to the reed switch, making it highly sensitive to magnetic force. This has the effect of stabilizing the operation even when the magnetic force from the operating magnet is weak.

Further, the switch mechanism using the reed switch according to the present invention has the effect of preventing malfunctions because the operation of the reed switch is stabilized by the mutual influence of the switching magnet and the holding and stabilizing magnet.

[Brief explanation of drawings]

1, 2, and 3 are explanatory diagrams of a switch mechanism using a reed switch according to the present invention, and FIG.
The figure is an explanatory diagram of an embodiment of a liquid level switch using a switch mechanism using a reed switch according to the present invention. 1... Fixed magnet, 2... Reed switch, 3... Switching magnet (rotating magnet), 4... Holding stable magnet (rotating magnet), 5, 8... Operating magnet, 7... Tank.

Claims (1)

[Claims] 1. In a switch mechanism configured to switch the contact point of a reed switch [ON] or [OFF] by the magnetic force of a magnet, an axial line extension of the lead wire of the reed switch 2 is provided on one side of the reed switch 2. One fixed magnet 1 is provided on the line, and on the other side of the reed switch 2, two opposing rotating magnets 3 and 4 are placed in mutual magnetic fields at positions slightly deviated from the axial extension line. By providing a rotary drive means 5 that is positioned and rotatably arranged and capable of rotating the rotary magnets 3 and 4, by operating the rotary drive means 5 to the on side, the two rotary magnets are rotated. The fixed magnets 1 and 2 are connected with the same poles of magnets 3 and 4 facing in the same direction.
The contact point of the reed switch 2 is switched to [ON] by the combined magnetic field of the rotating magnets 3 and 4,
By operating the rotary drive means 5 to the OFF side, the same poles of the two rotary magnets 3 and 4 are directed in the opposite direction, and the fixed magnet 1 and the two rotary magnets 3, A switch mechanism using a reed switch configured to switch the contact of the reed switch 2 to [OFF] by the combined magnetic field of the reed switch 2. 2. The reed switch switch mechanism according to claim 1, wherein the rotational drive means 5 is an operating magnet 5 that magnetically acts on the rotational magnets 3 and 4.