JPS593473Y2 - temperature switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the improvement of a temperature switch, and an object of the present invention is to provide a temperature switch that has a fast thermal response speed and excellent durability.

Hereinafter, referring to the drawings, a case 1 is made of a non-magnetic metal such as aluminum, and its upper opening is covered with a heat receiving plate 2.

Reference numeral 3 is a temperature-sensitive ferrite molded from a disc-shaped magnetic material piece, which has a so-called magnetic transformation point that causes a remarkable temperature change at a certain temperature, and is disposed on the back surface of the heat receiving plate 2 and approximately at the center thereof. A recess 4 is integrally formed therein.

Reference numeral 5 denotes a fixed magnet arranged in an overlapping manner within the recess 4.

Reference numeral 6 denotes a movable magnet whose magnetic field direction is the same as that of the fixed magnet 5, and which moves up and down within the case 1.

Reference numeral 7 denotes a pressing rod vertically disposed on the lower surface of the moving magnet 6.

8 is a fixed contact piece, and 9 is a movable contact piece that is curved by the pressing rod 7.

Reference numeral 10 denotes a position regulating piece formed on the inner circumferential wall of the case 1, which holds the movable magnet 6 so that it can be magnetized again to the blow fly 1-3.

To explain the operation of such a configuration, first, the heat receiving plate 2 is brought into contact with a container containing an object to be measured.

Now, if the temperature of the object to be measured is low and below the magnetic transformation point of the temperature-sensitive ferrite 3, it becomes a ferromagnetic state, and the lines of magnetic force of the fixed magnet 5 are absorbed by the temperature-sensitive ferrite l-3. As a result, the moving magnet l-6 is attracted to the temperature-sensitive ferrite 3, and the movable contact piece 9 comes into contact with the fixed contact piece 8 to form an electrically closed circuit.

When the temperature of the object to be measured rises and reaches the magnetic transformation point of the temperature-sensitive ferrite 3, the temperature-sensitive ferrite 3 decreases in magnetic permeability, becomes a paramagnetic material, loses its function as a magnetic material, and The magnetic field lines of the puffer magnet 5 are restored, and at this time a magnetic field is formed in the same direction as the moving magnet 6, so that the moving magnet 6 is repelled by the fixed magnet 5 and falls downward, as shown in FIG. The movable contact pieces 9 are pushed apart by the pressing rod 7 to form an electrical open circuit.

At this time, the moving magnet l-6 is again moved to the
It is secured to the position regulating piece 10 so as to be held within the magnetizable range where it can be attracted to the magnet 3.

Since the present invention is constructed as described above, it is possible to open and close the contact piece by utilizing the sudden change in magnetic permeability of the temperature-sensitive Fugly I. , it has excellent reliability and can be downsized.

Since the fixed magnet is placed overlapping the central recess on the bottom surface of the temperature-sensitive ferrite, even if this magnet is small, it contributes to the lowering movement of the moving magnet, and the contact between the moving magnet and the temperature-sensitive ferrite is on the top and bottom surfaces. This has the effect that even if some lateral deviation occurs in the vertical movement of the moving magnet, the adsorption and separation operations will not be affected.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of the temperature switch of the present invention, and FIG. 2 is an explanatory diagram of its operation. 3...Temperature-sensitive ferrite, 5...Fixed magnet 1~. 6... Moving magnet, 8, 9... Contact piece, 10... Position regulating piece.

Claims (1)

[Scope of utility model registration request] A temperature-sensitive ferrite having a magnetic transformation point; a fixed magnet superimposed in a central recess on the lower surface of the temperature-sensitive ferrite;
a movable magnet that can freely approach and separate from the temperature-sensitive ferrite and whose magnetic field direction is the same as that of the fixed magnet; a contact piece that forms an opening and closing path by the movement of the movable magnet toward and away from the temperature-sensitive ferrite; A temperature switch consisting of a position regulating piece that holds warm ferrite within the magnetizable range.