JP3289213B2 - Resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistor particularly suitable for use as a heater.

[0002]

2. Description of the Related Art Conventionally, an antifreeze heater has been used to heat a water pipe of a water heater installed outdoors. That is, as shown in FIG. 6, antifreeze heaters 220 are attached to a plurality of locations of the water pipe 200 of the water heater by the fixture 240, and when the outside air temperature or the temperature of the water pipe 200 becomes lower than a predetermined value, the freeze prevention is performed. An electric current is supplied to the heater 220 to generate heat, thereby preventing the water in the water pipe 200 from freezing.

Here, the anti-freezing heater 220 is placed in a heat-resistant case 221 made of ceramic or the like having an open upper surface.
A columnar fixed winding resistor (not shown) for heat generation is housed, and the periphery thereof is filled with heat-resistant silicon cement 223 and sealed. The bottom surface of the heat-resistant case 221 is recessed so as to come in contact with the water pipe 200 as much as possible.

[0004]

However, the conventional anti-freezing heater 220 has the following problems. Since the structure is such that the cylindrical fixed resistor is housed in the heat-resistant case 221, the dimension in the height direction cannot be reduced, and the thickness cannot be reduced.

[0005] The efficiency of heat transfer from the winding fixed resistor to the water pipe is poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a resistor which can be made thinner and which, when used as a heater, has good heat transfer efficiency to an object to be heated such as a water pipe. Is to do.

In order to solve the above problems, the present invention provides a resistor
A resistance wire is wound around a glass fiber bundle core material.
Formed into a flat shape to bend in the width direction,
Attach metal terminals to both ends of the core material, concave by bending
To the outer peripheral surface of the object to be heated.
And the side opposite to the side to be attached to the object to be heated
It was configured by attaching a heat insulating mat. Also, the present invention provides a method in which a resistor is provided around a core material bundled with glass fibers.
Into a flat shape so that it is curved in the width direction
Formed with metal terminals attached to both ends of the core material
Is stored in the recess of the heat-resistant case with the top open.
The heat case is substantially adhered to the bottom surface of the concave portion, and the concave portion is
The inside was sealed with a filler.

[0008]

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

[First Embodiment] FIG. 1 shows a freeze prevention heater 3 constituted by a resistor according to a first embodiment of the present invention.
FIG. As shown in the figure, the anti-freezing heater 30 is configured by covering the periphery of a flat heater 10 with a heat-resistant insulating sheet (heat-resistant insulating member) 35. Hereinafter, each component will be described.

The heater 10 has a resistance wire 1 around a core 11.
3 is wound, and the entirety of which is provided with metal terminals 15 at both ends is formed so as to be flat and curved in a substantially arcuate shape in the width direction.
It is configured by strongly holding and fixing the electric wires of the lead wires 19, 19 between the core material 11 and the core member 11.

Here, in order to manufacture the anti-freezing heater 30, first, as shown in FIG. 2 (a), a resistance wire 13 is attached to a long core material 11 made of a glass yarn (a bundle of glass fibers). Wind up.

Next, the core material 11 is impregnated with silicon rubber.

Next, the core material 11 is passed through the upper and lower rollers 81 and 83 shown in FIG. The core material 11 is curved, and the impregnated silicon rubber is cured by firing the core material 11 after being curved to maintain the curved shape. Next, the heater 10 is continuously cut to the length of the heater 10.

The metal terminals 15, 15 made of a thin metal plate shown in FIG.
The wires 9 and 19 are clamped and fixed in a state of being sandwiched. Thus, the heater 10 is completed. As the lead wire 19, for example, a silicon rubber glass braided heat-resistant electric wire is used.

Then, as shown in FIG. 1, the entire outer periphery of the heater 10 is wound and covered with a heat-resistant insulating sheet 35 and attached.

As the heat-resistant insulating sheet 35, for example, a glass braided sheet coated on both sides with silicon rubber is used.

FIG. 3 is a side sectional view showing an example of use of the freeze prevention heater 30 completed as described above. As shown in the figure, the anti-freezing heater 30 is attached to a water pipe 200 of a water heater installed outdoors, for example, by a mounting bracket 40 such that the lower surface of the anti-freezing heater 30 is substantially in close contact with the outer peripheral surface of the water pipe 200. .

Then, both lead wires 19, 19 (see FIG. 1)
If a predetermined voltage is applied in between, the heat generated in the resistance wire 13 is transmitted to the entire wide contact surface of the water pipe 200, and the water inside is heated to prevent its freezing.

The inventor of the present application conducted a performance comparison test between the above-described anti-freezing heater 30 and the anti-freezing heater 220 shown in FIG. That is, in this test, as shown in FIG. 4, a water pipe 200 made of copper pipe (outer diameter 16 mm, pipe thickness 1 m)
m, 1 m in length) is filled with water (water is kept still), and the anti-freezing heater 30 (or 22
0) is attached and energized for 25 minutes.
(Or 220) at point A 100 mm away from the center,
The temperature rise value (temperature rise value from the ambient temperature) at point B 50 mm away was measured. The results were as follows.

[Results] Applied power Point A Point B Conventional anti-freezing heater 220 15 W 22 deg 19 deg Anti-freezing heater 30 of this embodiment 30 9.5 W 23 deg 20 deg

As is clear from the above test results, points A,
B, the electric power applied to the anti-freezing heater to obtain the same temperature increase temperature is the same as the anti-freezing heater 30 of the present embodiment.
Has been found to be about 37% smaller than the conventional antifreeze heater 220.

That is, it has been found that the heat conduction efficiency from the anti-freezing heater 30 to the water pipe 200 is good and energy saving can be achieved.

The water pipe 20 of the anti-freezing heater 30
If a heat insulating mat 41 as shown by a dotted line in FIG. 3 is attached to the surface opposite to the side attached to the cover 0 so as to cover the entire surface, heat radiation from the upper surface of the antifreeze heater 30 to the air can be prevented. The water is cut off and the heat can be effectively used as heat for heating the water pipe 200. The heat insulating mat 41 is formed of a flexible soft plate such as glass wool or foamed silicon.

When the heat insulating mat 41 is attached, the following effects are further obtained. That is, the freeze prevention heater 3
Even if the surface temperature when baking 0 is set to a predetermined low temperature so as not to damage other electric parts such as the surrounding cords or cause a fire, the heat insulating mat 41 is attached. If it does, even if the freeze prevention heater 30
Even if the heat generating member itself generates heat at or above the predetermined low temperature, the surface of the heat insulating mat 41 can be kept at or below the predetermined low temperature. From this point, the water pipe 200 can be effectively heated.

[Second Embodiment] FIG. 5 shows an antifreezing heater 5 constituted by a resistor according to a second embodiment of the present invention.
FIG. 2 (a) is a partial plan view, FIG. 2 (b) is a partial front view, FIG. 2 (c) is a side sectional view, FIG. 2 (d) is a side view, FIG. 7E is a side sectional view showing a modification of the freeze prevention heater. As shown in FIGS. 3A to 3D, the anti-freezing heater 50 has the same flat shape as the heater 10 shown in FIG.
Is housed in a concave portion 62 of a heat-resistant case 60 made of ceramic or the like having an open upper surface, and the periphery thereof is filled and sealed with a filler 65 made of heat-resistant silicon cement.

Here, the lower surface 61 of the heat-resistant case 60 is recessed in a substantially arc shape so as to come in contact with the water pipe 200 as much as possible, but at the same time, the bottom surface 63 of the recess 62 is also formed in a substantially arc shape like the recess. Have been.

In manufacturing the anti-freezing heater 50, the heater 10 is first housed in a heat-resistant case 60. At this time, since the heater 10 is formed in a substantially arc shape, the heater 10 can be brought into substantially close contact with the bottom surface 63 of the concave portion 62. When the filler 65 is filled and sealed from above and solidified, the anti-freezing heater 50 is completed.

The anti-freeze heater 50 is used by being attached to a lower surface 61 of the water-supply pipe 200 by metal fittings (not shown) as shown by a dotted line in FIG.

In this embodiment, the heat-resistant case 60 is used. However, since the heater 10 housed therein is flat, the height of the heat-resistant case 60 can be reduced as compared with the conventional example shown in FIG. And the thickness can be reduced.

Further, since the heater 10 substantially contacts the bottom surface 63 of the concave portion 62, the entire bottom surface 63 can be heated, and the water pipe 200 can be heated more effectively than the conventional example.

As a modification of the freeze prevention heater 50 according to this embodiment, as shown in FIG. 5E, the heater 10 is housed in a concave portion 62 of a heat-resistant case 60, and a filler 65 is filled around the recess. A heat insulating mat 67 may be attached to the upper surface of the sealing material 65 so as to cover the sealing material. With this configuration, the same effect as that of the heat insulating mat 41 of the first embodiment is obtained.

[0032]

In the above embodiment, the water pipe is used as the heated pipe. However, the present invention is not limited to this, and any object to be heated can be used as long as it requires heating. Is also good. The shape of the object to be heated is not limited to a circle, and may be another shape such as a polygon. The heater 10 can be used alone.

In the above embodiment, the heater 10, the anti-freezing heater 30, and the anti-freezing heater 50 are used to prevent freezing. However, these heaters may be used as heaters for purposes other than anti-freezing. Further, in the above embodiment, an example in which the present invention is used as a heater is shown, but it may be used as a simple resistor. In this case, the effect of efficiently heating the object to be heated does not matter, but the effect of reducing the thickness of the resistor is produced.

[0035]

As described in detail above, the present invention has the following excellent effects. Since it is a resistor with a structure in which a resistance wire is wound around the core material,
Despite being a sheet-type resistor, the resistance value can be set freely and widely in a very easy manner by changing the number of turns of the resistance wire and the thickness of the resistance wire.

The thickness and weight of the resistor can be reduced.

When this resistor is used as a heater, the efficiency of heat transfer to the object to be heated is good. Therefore, the object to be heated can be more effectively heated with the same power consumption. When the object to be heated is heated at the same temperature, power consumption can be reduced and power saving can be achieved.

When this resistor is used as a heater, the object to be heated can be heated effectively, so that the object to be heated can be heated over a wide area by one heater, and therefore, the entire object to be heated having a long or large area can be heated. The number of heaters to be installed when heating the heater can be reduced, so that not only the cost can be reduced but also the mounting operation can be simplified.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a freeze prevention heater 30 formed by a resistor according to a first embodiment of the present invention.

FIGS. 2A and 2B are diagrams illustrating a manufacturing process of the heater 10. FIGS.

FIG. 3 is a side sectional view showing an example of use of the freeze prevention heater 30;

FIG. 4 is a diagram showing a method of a performance comparison test between the antifreezing heater 30 and a conventional example.

5A and 5B are views showing a freeze prevention heater 50 constituted by a resistor according to a second embodiment of the present invention, wherein FIG. 5A is a partially cutaway plan view, and FIG. FIG. 1C is a side sectional view, FIG. 2D is a side view, and FIG.
FIG. 7 is a side sectional view showing a modification of the freeze prevention heater.

FIG. 6 is a perspective view showing a usage example of a conventional anti-freezing heater 220.

[Description of Signs] 10 Heater (resistor) 11 Core material 13 Resistance wire 15 Metal terminal 19 Lead wire 30 Freezing prevention heater (resistor) 35 Heat resistant insulating sheet (heat resistant insulating member) 41 Heat insulation mat 50 Freezing prevention heater (resistance) 60) Heat-resistant case 62 Concave portion 63 Bottom surface 65 Filler 200 Water pipe (object to be heated)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05B 3/64 H05B 3/20 H05B 3/22-3/34 H05B 3/06

Claims (2)

(57) [Claims] 1. A resistance wire is provided around a core material bundled with glass fibers.
Into a flat shape so that it is curved in the width direction
Form, attach metal terminals to both ends of the core material, and make it curved
Therefore, the depressed portion should be substantially adhered to the outer peripheral surface of the object to be heated.
To the object to be heated.
A heat-insulating mat attached to the opposite surface
Armor. 2. A resistance wire around a core material bundled with glass fibers.
Into a flat shape so that it is curved in the width direction
Formed with metal terminals attached to both ends of the core material
Is stored in the recess of the heat-resistant case with the top open.
The heat case is substantially adhered to the bottom surface of the concave portion, and the concave portion is
A resistor, the inside of which is sealed with a filler.