JPS6017880Y2 - winding equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a winding device such as a discharge lamp ballast, and more particularly to a winding device equipped with a thermal protector that opens when the winding device overheats.

The thermal protector T includes two conductor pieces 2 and 3, one end of which forms input and output ends 1 and 1, respectively, as shown in FIG.
At each of the other ends, two contacts 2a, 3a are provided opposite each other.
is fixed, and one conductor piece 3 is made of bimetal B, so that during normal operation, both contacts are closed and the input/output terminal 1,
On the other hand, when the wire-wound equipment overheats, the bimetal B warps as shown by the broken line, opening between both contacts to cut off the current flow and prevent short-circuits between layers of the wire-wound equipment, fire, etc. It is intended to prevent

FIG. 2 shows another example of a thermal protector T, in which a bimetal B is provided close to one of the conductor pieces 3 and is shaped like a jump reversal spring and fixed at one end.
As shown by the broken line, the bimetal B is bent around the fixed end as a fulcrum, and the movable end B1 of the bimetal B pushes the conductor piece 3 to open the contact points.

However, in such a thermal protector T, since the conductor pieces 2 and 3 and the bimetal B are generally made of magnetic material, the magnetic field generated by the winding equipment has an influence, and the desired precise protection operation cannot be achieved. There is a possibility that the opening operation between the contacts cannot be obtained.

That is, as shown in FIG. 3, when a strong magnetic field H1 exists in the same direction as the opening and closing operation direction of the movable contact 3a, this magnetic field H□ causes the conductor pieces 2 and 3 of the thermal protector T to
Alternatively, an unexpected force is applied to the bimetal B at the initial stage of manufacture, and the thermal protector T does not open or close at the desired temperature, causing a malfunction.

On the other hand, as shown in Fig. 4, it is possible to incorporate a thermal protector T in the magnetic shielding case 4 to block the influence of the magnetic field H generated by the winding 5, but the structure becomes complicated and the cost increases. .

The present invention was devised in view of these drawbacks, and aims to prevent malfunctions of the thermal protector and provide accurate opening/closing operations with a simple configuration.

Figures 1 and 6 show an embodiment of the present invention, in which two contacts 2a and 3a facing each other are fixed to the tips of two conductor pieces 2 and 3 placed opposite each other, and one The conductor piece 3 is shaped with bimetal B, and these are formed into conductor pieces 2 and 3.
The thermal protector T is housed in a rectangular parallelepiped-shaped housing 6 having a surface parallel to the thermal protector T.
is fixed in close contact with the upper surface of the iron core 8 of the discharge lamp ballast 7, which is a wire-wound device.

In this embodiment, since the contact operating direction of the thermal protector T is perpendicular to the magnetic path l of the ballast winding 5,
The magnetic field H generated by the ballast 7 has no effect on the contact operating direction m, as shown by the arrow in FIG.

Note that if the operating direction of the contacts of the thermal protector is perpendicular to the magnetic path of the winding device, the conductor pieces 2 and 3 may be arranged so that a vertical magnetic field is applied to them, as shown by arrow H3 in Figure 3. Of course it's good.

As mentioned above, in the present invention, since the operating direction of the contacts of the thermal protector is perpendicular to the magnetic path of the winding, malfunction of the thermal protector can be prevented with a simple configuration, and the winding can be protected accurately. Ta.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic diagrams showing the structure of the thermal protector, Figure 3 is a schematic diagram showing the relationship between the contact operating direction and the magnetic field, Figure 4 is a perspective view of a conventional example, and Figure 5 is the main A perspective view showing an embodiment of the invention, and FIG. 6 is a partially cutaway perspective view of a thermal protector used in the same. 2.3...Conductor piece, 2a, 3a...Contact, B
... Bimetal, T ... Thermal protector, 5 ... Winding wire, 1 ... Magnetic path.

Claims (1)

[Scope of utility model registration request] It has a winding, two conductor pieces each having a fixed contact, and a bimetal for controlling opening/closing between the contacts, and at least one of the conductor piece and the bimetal is made of a magnetic material and opens when the temperature of the winding increases. A winding device having a thermal protector, characterized in that the thermal protector is arranged close to the winding so that the direction of the contact opening/closing operation is perpendicular to the magnetic path of the winding. .