JPH0793126B2 - Insulation tube-encapsulated electric element and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric element encapsulated in an electric insulating tube and a method for manufacturing the electric element. More specifically, the present invention relates to an insulating tube-encapsulated electric element formed into a shape that easily abuts a structure having a curvature on the surface such as a fluorescent tube or a general piping, and a method for manufacturing the same.

[0002]

2. Description of the Related Art For example, a heat-retaining heater is used in a copying machine, a facsimile, a backlight of various instruments, or the like in order to stabilize the light quantity of an exposure fluorescent tube or the like even in a low temperature atmosphere.

FIG. 5 is a perspective view showing a state of a heat retaining heater attached to a fluorescent tube (not shown), and FIG. 6 is a perspective view showing an example of a temperature detector used in the heat retaining heater of FIG. Is. The heater for heat retention has a structure in which a cord-shaped heater 12 as a heater element is sandwiched between aluminum foils 11 having two adhesive layers. This heat-retaining heater is fixed to the surface of the fluorescent tube with a holder or a double-sided adhesive tape with a hole 13 formed in the center. Figure 6 shows the temperature detector
As shown in FIG. 3, the temperature detecting element 15 is arranged on the surface of the silicone rubber sponge 14. The temperature detecting element 15 is pressed against the fluorescent tube through the hole 13 of the heat retaining heater and fixed by a holder so that the temperature detecting element 15 faces the fluorescent tube. It

Besides, as the heat retaining heater, a heater as shown in FIG. 7 is used. FIG. 7 is an exploded perspective view of another heat retention heater. This warming heater is made of metal foil 1
6 is formed into a meandering pattern by punching or etching, and the polyester resin film 1
This is a so-called laminated heater in which 7, 17 are stacked and heated under pressure. FIG. 8 is a sectional view showing a fixing structure of a temperature detecting element of a fluorescent tube. As shown in FIG. 8, an egg-shaped temperature detecting element 18 is used to detect the temperature of the laminate heater, and is fixed to the surface of the laminate heater 19 with a tape or a heat shrink tube 20.

[0005]

All of the above-mentioned heaters for heat retention are sandwiched between two sheet-like members such as aluminum foil and polyester resin film, and the sheet-like members are accurately placed on both sides of the heater element. It is necessary to overlap and cut the misalignment of the mating surfaces (ends). Also, the laminated heater shown in FIG. 7 is cheaper and more economical than the heat-retaining heater (see FIG. 5) in which a cord-shaped heater is sandwiched by aluminum foil, but because it has rigidity, it adheres closely to the surface of the fluorescent tube. It has the drawback of being difficult to do. Further, the laminated heater can be formed into a curved surface so as to be in close contact with the surface of the fluorescent tube, but a new manufacturing process is required.

The temperature detection of the above-mentioned heater for heat retention depends on a slight heat sensitive portion of the temperature detection element, and in particular, FIG.
With the temperature sensor shown in, it is difficult to adjust the installation pressure, and if the pressing method against the fluorescent tube is not appropriate, the heat-sensitive part will shift, or if it is pressed too hard, the heat-sensitive part will slip into the sponge and the correct temperature It had the drawback that it could not be detected. The temperature sensing element shown in FIG. 8 has an oval outer shape,
Since the mounting surface is curved, a gap is created between the temperature detecting element and the mounting surface and the fixing tape or the fixing shrink tube, resulting in poor sensitivity. Further, since the egg-shaped temperature detecting element is mounted on the curved surface, the mounting workability is remarkably deteriorated, and the sensitivity tends to deviate from a fixed position during mounting or in use, resulting in variations in sensitivity.

The object of the present invention is to solve the above-mentioned drawbacks, such as a heater element which is low in product cost and has a small number of manufacturing steps and / or a temperature sensing element which can be mounted easily and can accurately detect temperature, and which can be economically formed and has a curvature. An object of the present invention is to provide an insulating tube-encapsulated electric element that can be easily attached to the surface of a structure and a method for manufacturing the same.

[0008]

In order to achieve the above-mentioned object, an insulation tube-encapsulated electric element according to the present invention has a temperature sensing element and / or a heater element as electric elements arranged in an extruded insulation tube, It is characterized in that the inner surfaces of the insulating tube except the part where the element is located are brought into close contact with each other. In addition, the manufacturing method is characterized in that after the electric element is placed in the extruded insulating tube, the inner surfaces of the insulating tube except for the portion where the electric element is located are brought into close contact with each other by heating under pressure with a hot press.

[0009]

According to this structure, the electric element is covered with the insulating tube, and the inner surfaces of the insulating tube except for the portion where the electric element is located are brought into close contact with each other by hot pressing to form a flat surface or a temperature sensing surface and / or Alternatively, since it is formed into a curved surface having a curvature that is substantially equal to the mounting surface of the heated surface, it is particularly easy to mount on a mounting surface having a curvature and the thermal conductivity between the electric element and the mounting surface is increased, and the electric element detects temperature. When it is an element, the responsiveness can be enhanced, and when the electric element is a heater element, the thermal efficiency can be enhanced. Further, the insulating tube-encapsulated electric element of the present invention has a shape very similar to that of a laminated heater, but since an extruded tube is used as an insulating encapsulating material instead of a laminate film, the product cost is low.

According to the above-described manufacturing method, the manufacturing work is simple and the manufacturing process is small, and even a curved surface is not required to have a special manufacturing process. Furthermore, since an extruded insulation tube is used as an insulator that encloses the electric element, unlike the case where the electric element is arranged between two sheets, the work of precisely stacking the sheets is not necessary, There is no deviation. Therefore, there is no need to cut the end portion, and the workability in manufacturing is excellent.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of an insulation tube-encapsulated electric element according to the present invention, FIG. 2 is a perspective view showing a manufacturing process of the insulation tube-encapsulated electric element according to the present invention, and FIG. It is sectional drawing which shows the manufacturing process of a package electric element. In FIG. 2, the inner diameter is 20 mm and the wall thickness is 0.
Liquid thermosetting silicone rubber 2 is sufficiently applied to the inner surface of a silicone rubber tube 1 having a high thermal conductivity of 4 mm and a length of 30 mm. Here, the silicone rubber tube 1 having high thermal conductivity is obtained by blending silicone rubber with alumina silica, zinc oxide, a small amount of boron nitride, etc., and by extrusion molding, a tube with high thermal conductivity is realized.

Next, a diode type thermistor 4 as a temperature detecting element is attached to the tips of the lead wires 3 and 3 by caulking terminals 5 and 5.
The subassemblies connected by means of are arranged in the tube 1 at approximately the center. As shown in FIG. 3, such an intermediate body 6 is placed in molds 7 and 7 having the same diameter as that of a fluorescent tube of φ32 mm, the silicone rubber tube 1 is folded by hot pressing, and the inner surfaces facing each other are thermoset. When the volatile silicone rubber 2 is vulcanized, it is adhered to form the insulating tube-encapsulated electric element shown in FIG.

Here, the molding surface of the molds 7, 7 has a thickness of 3 m.
m silicone rubber sponges 8 and 8 are installed,
This prevents damage to the thermistor due to pressure during molding. Also, the bonding conditions are a temperature of 120 ° C, a time of 30 minutes, and a pressure of 1 kg.
f / cm ² . The reference numerals in FIG. 1 are the same as those shown in FIGS.

In order to investigate the temperature detection performance of this example, the temperature was detected by fixing the insulating tube-encapsulated electric element shown in FIG. 1 to the surface of a φ32 mm aluminum tube whose temperature was precisely adjusted to 40.0 ° C. When the resistance value of the thermistor was converted into temperature, it was 39.6 ° C. On the other hand, when measured with the temperature detector shown in FIG. 6 under the same measurement conditions, the detected temperature was 38.5 ° C.

As is clear from the above description, in the insulating tube-encapsulated electric element of this embodiment, the outer wrapping for enclosing the temperature detecting element has a high thermal conductivity and is formed in a curved shape.
It collects heat from a wide range and enables accurate temperature detection. In this embodiment, the example in which the thermistor is used as the temperature detecting element has been described, but a thermocouple may be used.

In the insulated tube-encapsulated electric element of this embodiment, since the temperature detecting element is covered with a silicone rubber tube having excellent flexibility and the outer shape is formed into a curved surface, the temperature sensing element is formed on the surface of the aluminum tube. It is easy to install and has excellent workability in installation compared to conventional temperature detectors.

In the previous example, a temperature detecting element was used as an electric element covered with an insulating tube, but when an etching heater element is used as shown in FIG. 4, a heat retaining heater with excellent thermal efficiency is obtained. FIG. 4 is a perspective view showing another embodiment of the electric element according to the present invention, and reference numeral 9 is a metal foil and 10 is a silicone rubber tube. It is also possible to arrange the temperature detecting element and the heater element in the same tube.

[0018]

As described above, since the insulating tube-encapsulated electric element of the present invention is formed in a flat shape or a curved shape, it can be brought into surface contact with a curved surface such as a fluorescent tube. As shown in the example, when the electric element is a temperature detecting element, the response is excellent and the sensitivity error due to the mounting method is extremely small. When the electric element is a heater element, the mounting surface can be efficiently heated. The manufacturing method is a simple method of molding by hot pressing, and is superior in manufacturing workability and mass productivity as compared with a method of laminating sheets to form the same shape.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an insulating tube-encapsulated electric element according to the present invention.

FIG. 2 is a perspective view showing a manufacturing process of an insulating tube-encapsulated electric element according to the present invention.

FIG. 3 is a cross-sectional view showing a process of manufacturing an insulating tube-encapsulated electric element according to the present invention.

FIG. 4 is a perspective view showing another embodiment of the insulating tube-encapsulated electric element according to the present invention.

FIG. 5 is a perspective view showing a state of a heat retaining heater attached to a fluorescent tube (not shown).

6 is a perspective view showing an example of a temperature detector used in the heat retention heater of FIG.

FIG. 7 is an exploded perspective view of another heater for heat retention.

FIG. 8 is a sectional view showing a fixing structure of a temperature detecting element of a fluorescent tube.

[Explanation of symbols]

1 Silicone Rubber Tube 2 Thermosetting Silicone Rubber 3 Lead Wire 4 Diode Type Thermistor 5 Caulking Terminal 6 Intermediate 7 Mold 8 Silicone Rubber Sponge 9 Metal Foil 10 Silicone Rubber Tube 11 Aluminum Foil 12 Cord Heater 13 Hole 14 Silicone Rubber Sponge 15 Temperature Sensing Element 16 Metal Foil 17 Polyester Resin Film 18 Temperature Sensing Element 19 Laminate Heater 20 Heat Shrink Tube

Claims (4)

[Claims] 1. An insulating tube encapsulating electric element in which an electric element is arranged in an insulating tube, wherein inner surfaces of the insulating tube excluding a portion where the electric element is located are in close contact with each other. Electric element. 2. A method of manufacturing an insulating tube-encapsulated electric element, comprising: placing an electric element in an insulating tube; placing the electric element in the insulating tube; A method for manufacturing an insulating tube-encapsulated electric element, which comprises closely contacting the inner surfaces of the insulating tube except for the positioned portion. 3. An insulation tube-encapsulated electric element comprising an electric element arranged in an insulation tube, wherein an electrically conductive material is provided in a silicone rubber extruded insulation tube having an excellent thermal conductivity, the inner surface of which is coated with thermosetting silicone rubber. A temperature sensing element and / or a heater element is arranged as an element, and the inner surfaces of the insulating tube except the portion where the electric element is located are brought into close contact with each other to form a curved surface as a whole. . 4. A method for producing an insulation tube-encapsulated electric element, comprising an electric element arranged in an insulation tube, wherein a thermosetting silicone rubber is applied to the inner surface of the extruded insulation tube of silicone rubber. After disposing the temperature sensing element and / or the heater element as an electric element,
Inner surfaces of insulating tubes excluding the portion where the electric element is located, which are heated under pressure by a heat press machine including a die having substantially the same curvature on the mounting surface of the temperature detection surface and / or the heating surface. Is adhered, and the whole is formed into a curved surface shape.