JPS5915000Y2 - switch mechanism - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a switch mechanism that detects the presence or absence of a magnetic substance and an increase in the magnetic substance or ambient temperature with a single switch.

In the past, this type of temperature detection generally utilized the curvature of a bimetal due to temperature changes, or used different switch mechanisms or circuits, such as temperature-sensitive reed switches.

Additionally, various magnetic sensors have been used to detect magnetic substances.

For this reason, there are problems in that it requires a large structural space and is also expensive.

This invention was made in order to solve the above-mentioned problem, and forms a reed switch having a contact portion in which at least two magnetic lead pieces are partially overlapped. A permanent magnet having magnetic poles in the direction of the reed axis of the reed switch is disposed near the contact portion of the reed switch, and temperature-sensitive magnetic bodies having the same Curie temperature are arranged adjacent to both magnetic poles of the permanent magnet. When a magnetic body from the outside comes close to the two temperature-sensitive magnetic bodies, the contact of the reed switch becomes open, and in this state, the surrounding temperature rises and the temperature-sensitive magnetic body It has a simple structure and can detect the presence or absence of a magnetic material, as well as the temperature of the magnetic material or the ambient temperature, with a single reed switch configured so that the contact closes when the temperature exceeds the magnetic transformation point. The object of the present invention is to provide an inexpensive switch mechanism that is suitable for mass production.

Hereinafter, the configuration of this invention will be specifically explained based on the illustrated embodiments.

1 to 4 are longitudinal cross-sectional views and side views showing various aspects of the embodiment of this invention, in which reference numeral 1 indicates two magnetic lead pieces 1a and 1b sealed in a glass tube or the like. It is a node switch.

A permanent magnet 2 is disposed near the contact portion of the reed switch 1 and has a magnetic pole along the node axis direction.

3 and 4 are temperature-sensitive magnetic bodies having the same Curie temperature, and are arranged in parallel adjacent to the magnetic poles N and S of the permanent magnet 2, respectively.

At this time, the magnetic transformation points of the temperature-sensitive magnetic bodies 3 and 4 are lower than that of the permanent magnet 2 and are the same or almost equal.

FIG. 5 shows that in order to improve the heat collection efficiency and facilitate installation of the embodiments shown in FIGS. 1 to 4 above, heat collection fins 5 are provided to protect the sealed portion of the reed switch. The figure also shows an embodiment in which holders 7 and 8 for guiding lead wires 9 and 10 are attached.

The operating principle of the magnetic material and temperature detection switch mechanism (hereinafter referred to as detection switch mechanism) constructed as described above will be explained with reference to FIG.

In Fig. 6A, there is no magnetic material 6 in the vicinity of the detection switch mechanism.
This is a state diagram in which the temperature of the temperature-sensitive magnetic bodies 3 and 4 is lower than the magnetic transformation point, and in this case, the permanent magnet 2, the temperature-sensitive magnetic body 3, each lead piece 1a, lb, and the temperature-sensitive magnetic body 4 constitute a magnetic circuit. As such, the main magnetic flux passes through each of the lead pieces 1a and lb, and the contacts become closed.

6 is a state in which the temperature of the temperature-sensitive magnetic bodies 3 and 4 is lower than the magnetic transformation point, and the magnetic body 6 is in a state where the detection switch mechanism 04
Indicates close proximity.

At this time, the permanent magnet 3, the adjacent magnetic body 6, and the temperature-sensitive magnetic body 4 constitute a magnetic circuit, and each lead piece 1a, l
The magnetic flux passing through b will be drastically reduced, and the contact will be in an open state.

Next, when the magnetic body 6 is close to the detection switch mechanism, the temperature of the magnetic body 6 increases, and the temperature of the temperature-sensitive magnetic body 4 rises due to heat conduction or due to an increase in ambient temperature, exceeding the magnetic transformation point. The situation when this occurs will be explained with reference to FIG.

At this time, the temperature-sensitive magnetic material 4 loses its ferromagnetism, so the permanent magnet 2
Then, each lead piece 1a, lb forms a magnetic circuit, and the contacts are in a closed state.

In this way, the contact is in the open state only when the magnetic body 6 is close to the detection switch mechanism and the temperature of the temperature-sensitive magnetic body 4 is lower than the magnetic transformation point, and otherwise the contact is in the closed state. .

The magnetic properties of the temperature-sensitive magnetic material 4 are reproducible, based on the principle described above, regardless of whether the temperature rises or falls, or whether the magnetic material 6 is close to or away from the detection switch mechanism. This allows stable contact operation to be reproduced.

As detailed above, according to this invention, the detection switch mechanism can easily detect the presence or absence of a magnetic substance and detect temperature with a single mechanism that has a simple structure, is compact, and can be mass-produced at low cost. For example, in a cooking device using high-frequency electromagnetic induction, it is practical for use in checking the presence or absence of magnetic silver and detecting when the pot runs out of water and the temperature rises abnormally.

[Brief explanation of drawings]

1 to 4 are longitudinal cross-sectional views and side views showing various aspects of the embodiment of this invention, FIG. 5 is a perspective view of one embodiment showing the specific structure of the above embodiment, and FIG. 6 A9 and C are explanatory diagrams of the operating principle in the embodiment of this invention. 1... Reed switch, la, lb... Magnetic lead piece, 2... Permanent magnet, 3... Temperature-sensitive magnetic material, 4...
・Temperature-sensitive magnetic material, 5... Heat collecting fin, 6... Magnetic material,
7, 8...Holder 9,10...Lead wire.

Claims (1)

[Scope of utility model registration request] A reed switch having a contact portion is formed by partially overlapping two magnetic reed pieces, and a permanent magnet having a fine pole is arranged in the axial direction of the reed piece near the contact portion of the reed switch, A Chiang Wen magnetic material is arranged in parallel around the outer periphery of the reed switch so as to have a magnetic transformation point lower than that of the permanent magnet and also the same or approximately the same, and to be coupled to a magnetic sail at both magnetic poles of the permanent magnet, respectively; When a magnetic material from the outside comes close to the two temperature-sensitive magnetic materials, the contacts of the reed switch become open, and in this state, the surrounding temperature rises and the temperature of the temperature-sensitive magnetic materials exceeds the magnetic transformation point. A switch mechanism characterized in that a contact is configured to be in a closed state when .