JPH0159722B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of coating a thermistor for anti-freezing with a soft vinyl chloride material as an insulator by a high frequency dielectric heating method.

The purpose of the present invention is to process the thermistor and the insulator so that there is no space between them, and to miniaturize the thermistor and the insulator.
The object of the present invention is to provide a method for coating a thermistor that is easy to attach to an object to be heat-insulated and has good heat conduction efficiency.

Conventionally, anti-freezing thermistors are products in which the thermistor is placed inside a flexible vinyl chloride tube and the cut end is crimped.As a result, air remains inside, resulting in a bulging shape, which makes it difficult to attach to the object to be insulated, and can lead to overfilling. Because the thermistor is placed in the air, there is a flaw that reduces the efficiency of heat transfer.

Therefore, the technical means of the present invention to overcome the difficulties of the conventional method and achieve the objective is to connect a circular contact terminal plate to each core end of a two-core cord, and to connect a circular contact terminal plate between the two. An uncoated thermistor that sandwiches a plate-shaped semiconductor is placed inside the lower die of a special high-frequency dielectric heating machine consisting of an upper die and a lower die, and a hexagonally pressed flexible vinyl chloride plate is placed on top of the uncoated thermistor. An uncoated thermistor is loaded, a plate of the same shape and quality is placed on the top surface, this is used as a heated object, an upper mold that also serves as a heating and pressurizing mold is fitted, and a high frequency voltage is applied from the electrodes of both molds to create a dielectric. The action causes internal heat generation and heats up.
The soft vinyl chloride plates on the top and bottom are melted, and the melted insulation is uniformly distributed over the uncoated thermistor in a mold that uses heat-resistant material to prevent the melt from flowing out and has a heat sink to avoid the harm of overheating. It is designed to be welded.

Embodiments of the present invention will be described below with reference to the drawings.

First of all, in Figures 1 and 2, Figure 1 shows the upper die 4 of the high-frequency dielectric heating machine, and Figure 2 shows the lower die 9 of the machine. It has a special mechanism that makes it possible. That is, the lower mold 9 in FIG. 2 has a brass bottom plate 14.
In order to prevent insulating material from flowing out on top, the introduction 2-core cord 1
A brass lower mold plate 13 is surrounded on three sides except for the 9 side by a lower mold preventer 16 made of Teflon material, and a lower mold heat shield made of Teflon material is placed in the center of this plate at the bottom to prevent overheating of the uncoated thermistor 21. A heated body recessed part 11 for loading a heated body and welding an insulator therein is provided in the part 10, and continuing to the left, an introduction 2 is provided.
A lower attached mold part 12 into which a core cord 19 is inserted is provided in series. The corresponding upper mold 4 in FIG. A brass upper plate 3 having a protruding pentagonal brass convex portion 3 to be joined to the plate 13 is provided, and this plate has a Teflon upper mold in the center to prevent overheating of the upper surface of the uncoated thermistor 21. It has a heated part 7, and is configured by fixing an upper mold preventer 8 made of Teflon material that is continuous to the left and fitted into the left step part 23 of the lower mold preventer 16. Next, Figures 3 to 5
In the figure, as shown in FIG.
The uncoated thermistor 21 is formed by interposing zero. Therefore, a fifth plate is placed on the brass lower mold plate 13 of the lower mold 9.
A bottom covering plate 22 made of soft vinyl chloride material pressed into a hexagonal shape as shown in the figure is placed, an uncoated thermistor 21 is loaded on top, and a same-shaped thermistor as shown in FIG. The upper surface covering plate 17 is placed on it and becomes a heated body. Next, the upper mold 4 with pressurizing force
is lowered to join the brass convex mold part 2 to the brass lower mold plate 13, and a high frequency voltage is applied from the lower mold electrode 15 and the upper mold electrode 1, respectively, to give a dielectric effect to the heated body and cause internal heat generation. The lower surface covering plate 22 and the upper surface covering plate 17 are melted by heating at 160 to 180°C. In this case, the lower mold preventer 16, which is made of Teflon material and surrounds the lower mold 9 on three sides, and the upper mold preventer 8, which is fixed to the left side of the upper mold 4, are fitted together and the molten insulating material flows out. In addition, the lower mold heated part 10 provided at the bottom of the heated member concave part 11 of the lower mold 9 made of Teflon material, and the upper mold heated part 7 provided in the center of the brass convex mold part 2 of the upper mold 4. Both are intended to avoid damage to the uncoated thermistor 21 due to overheating. In the mold formed by the lower mold 9 and upper mold 4 of the high-frequency dielectric heating machine thus configured, the lower covering plate 22 and the upper covering plate 17 are melted and uniformly welded to the uncoated thermistor 21. As a result of the coating process, a coated finished product 24 as shown in FIG. 6 was obtained.

According to the method of the present invention, residual air within the coating can be completely discharged, so the product can be made smaller, easier to attach to the object to be insulated, and has the advantage of providing a product with high heat conduction efficiency. There is.

[Brief explanation of drawings]

Figure 1 is a top perspective view of the high-frequency dielectric heating machine, Figure 2
The figure is a perspective view of the lower mold, and Figure 3 is a perspective view of the upper cover plate.
FIG. 4 is a perspective view of the uncoated thermistor, FIG. 5 is a perspective view of the lower surface covering plate, and FIG. 6 is a perspective view of the coated finished product. Explanation of symbols 1...Top mold electrode, 2...Brass convex mold part, 3...Brass top plate, 4...Top mold, 5...Elevating pressure plate, 6...Top attached mold part, 7...Top Mold heat sink, 8
...Upper die prevention body, 9...Lower die, 10...Lower die heat sink, 11...Heat target concave part, 12...Lower attached mold part, 13...Brass lower template plate, 14... Brass bottom plate, 1
5... Lower die electrode, 16... Lower die preventer, 17...
Top cover plate, 18...Contact terminal board, 19...Introduction 2-core cord, 20...Semiconductor, 21...Uncoated thermistor, 22...Bottom cover plate, 23...Left step portion, 24...Coating Finished product.

Claims (1)

[Claims] 1 A brass bottom plate 14 is surrounded on three sides by a heat-resistant lower mold preventer 16, and a heat-resistant lower mold heat sink 10 is placed at the bottom in the center.
Brass lower mold plate 13 having a concave portion 11 of the heated body
A five-sided lower mold 9 with a heat-resistant upper mold preventer 8 fixed on one side and a heat-resistant upper mold heated part 7 in the center of the other three sides protruding downward. A lower cover plate 22 is installed in the recessed part 11 of the high frequency dielectric heating machine, which is constructed by a brass upper plate 3 having a brass convex part 2 and an upper mold 4 having an elevating pressure plate 5 on the upper side. The uncoated thermistor 21 is loaded thereon, the upper coated plate 17 is placed, the upper mold 4 is fitted, and electricity is applied to convert the lower coated plate 22 and the upper coated plate 17 into uncoated thermistors in the mold. A coating processing method for a thermistor for anti-freezing, characterized by welding the anti-freezing thermistor to 21.