JP2505841Y2 - Surface temperature detector - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature detector used for detecting the surface temperature of fluorescent tubes, general piping, and structures having complicated shapes.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing an example of a surface type temperature detector conventionally used to control the surface temperature of an exposure fluorescent tube of a copying machine, and FIG. 5 is a conventional exposure fluorescent tube of a copying machine. FIG. 6 is a perspective view showing an example of the sheet heating element used in FIG. 6, and FIG. 6 is a perspective view showing an example of the surface temperature sensor used in the sheet heating element of FIG. In recent years, a surface type temperature detector has been widely used for controlling the surface temperature of an exposure fluorescent tube of a copying machine. In such a temperature detector, as shown in FIG. 4, a cord-shaped heater 10 and a temperature detecting element 11 are arranged between two aluminum foils 9 and 9 each having an adhesive layer. 9 were adhered to each other and fixed to the surface of the fluorescent tube by a holder or a double-sided adhesive tape. Here, 12, 12 are lead wires of the cord-shaped heater, 13,
Reference numeral 13 is a lead wire of the temperature detecting element.

Further, FIG. 5 shows another example, and similarly to the above, the cord-shaped heater 10 is arranged between the two aluminum foils 9 and 9 having the adhesive layers, and the aluminum foils 9 and 9 are bonded by hot pressing. To be done. The molded body is fixed to the surface of the fluorescent tube with a holder or a double-sided adhesive tape with a hole 14 formed in the center thereof. As shown in FIG. 6, the temperature detector has a temperature detecting element 16 arranged on the surface of a silicone rubber sponge 15 and is pressed against the fluorescent tube through the hole 14 of the aluminum foil so that the temperature detecting element 16 faces the fluorescent tube. It is fixed with a holder.

[0004]

[Problems to be solved by the invention] Temperature detection shown in FIG .
The vessel has a cord-shaped heater and a temperature detection element integrated
Structure is complicated because of the
But there is a drawback that both have to be replaced
It was This temperature detector also uses a cord heater and
A structure in which the degree detection element is held between two sheets of aluminum foil
Therefore, it is necessary to accurately overlap the sheet-shaped bodies.
In addition to the above, if there is a misalignment on the mating surface,
It is necessary to cut the misaligned part and it is inferior in workability
Met.

On the other hand, in the case of the temperature detector shown in FIG.
The cord-shaped heater and temperature sensing element are independent structures
Therefore, only one of them can be replaced.
Although it has the advantage of reducing the number of
Knowledge depends on a small amount of heat-sensitive part of the temperature sensing element.
Therefore, if the pressing method against the fluorescent tube is not appropriate, the heat-sensitive part will be displaced, and if pressed too strongly, the heat-sensitive part will slip into the sponge, and accurate temperature detection cannot be performed. Also, in the case of this temperature detector,
Hold a cord-shaped heater with two sheet materials such as Lumi foil.
Because it is a configuration, work to accurately overlap the planar objects
Is required and if the mating surfaces are misaligned
Is inferior in workability because it is necessary to cut the gap
It was a thing.

The present invention was made on the basis of such points.
The purpose is to form a structure independent of the heater, and it has excellent thermal response regardless of the mounting method .
It is to provide a temperature detector that can accurately detect temperature at low cost .

[0007]

In order to achieve the above object, the surface temperature sensor according to the present invention has a temperature sensing element arranged in a silicone rubber tube having excellent thermal conductivity and heat resistance.
The inner surfaces of the silicone rubber tubes
Adhesive with rubber, and the entire
It is characterized in that they are formed into substantially the same shape.

[0008]

According to such a structure, a structure which is independent of the heater part and which is extremely well adapted to the temperature detecting surface can be formed, and the irrationality of the conventional temperature detector described above can be eliminated and the temperature detecting The outer skin that encloses the element has a high thermal conductivity, so it exerts the effect of collecting heat from a wide range, and since it does not deform like a sponge by pressing, it can eliminate the cause of mounting deviation, which is rational and accurate. The temperature can be detected. In addition, the outer skin that wraps the temperature sensing element
Because it is made of silicone rubber tube,
There is no need to stack two sheets of material, as in the past
There is no misalignment on the mating surface. For this reason,
Workability is improved because there is no need to cut the gap
It This makes it possible to provide an inexpensive temperature sensor.
It

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings. 1 is a perspective view showing an embodiment of a surface type temperature detector according to the present invention, FIG. 2 is a perspective view showing a manufacturing process of the surface type temperature detector according to the present invention, and FIG. 3 is a surface type temperature detector according to the present invention. FIG. 6 is a cross-sectional view showing the manufacturing process of. In FIG. 2, a liquid thermosetting silicone rubber 2 is sufficiently applied to the inner surface of a silicone rubber tube 1 having an inner diameter of 20 mm, a wall thickness of 0.4 mm, and a length of 30 mm and having high thermal conductivity.
Here, a silicone rubber tube 1 having high thermal conductivity
Alumina silica, zinc oxide, and a small amount of boron nitride are mixed with silicone rubber, and a tube with high heat conductivity is realized by extrusion molding.

Next, a diode type thermistor 4 as a temperature detecting element is attached to the ends 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 temperature detector 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 examine the temperature detection performance of this embodiment, the temperature detector shown in FIG. 1 was fixed on the surface of a φ32 mm aluminum tube whose temperature was precisely adjusted to 40.0 ° C. to detect the temperature, and the resistance of the thermistor was measured. After converting the value to temperature,
It was 39.6 ° C. On the other hand, when the temperature detector shown in FIG. 6 was used under the same measurement conditions, the thermistor used was a small one having a volume of about 1/10 that of the temperature detecting element 4 used in the present embodiment. , The detection temperature is 3
It was 8.5 ° C.

As is apparent from the above description, the temperature detector according to the present invention has a high thermal conductivity in the outer cover that encloses the temperature detection element, so that heat can be collected from a wide range and accurate temperature detection can be performed. 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. Further, if an aluminum foil is attached to the silicone rubber surface in contact with the fluorescent tube, more accurate temperature detection becomes possible. It has flexibility enough to be applied to a complicated structure.

[0014]

As described above, the temperature detector according to the present invention is independent of the heater part and can be well adapted to the temperature detecting surface, and the outer skin enclosing the temperature detecting element has a high thermal conductivity, so that it is wide. Demonstrate the action of collecting heat from the range, and
Since there is little deformation due to pressing, rational temperature detection is possible. In addition, there is only one outer shell that encloses the temperature sensing element.
As it is made of rubber tube,
Compared with the case where two sheet-like bodies are stacked and molded into the same shape
All in all, it excels in manufacturing workability. Therefore, for cheap products
It becomes possible to provide.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a surface temperature sensor according to the present invention.

FIG. 2 is a perspective view showing a manufacturing process of a surface temperature sensor according to the present invention.

FIG. 3 is a cross-sectional view showing a manufacturing process of the surface temperature sensor according to the present invention.

FIG. 4 is a perspective view showing an example of a surface type temperature detector conventionally used for controlling the surface temperature of an exposure fluorescent tube of a copying machine.

FIG. 5 is a perspective view showing an example of a sheet heating element conventionally used for an exposure fluorescent tube of a copying machine.

FIG. 6 is a perspective view showing an example of a surface temperature detector used in the planar heating element of FIG.

[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 Aluminum Foil 10 Corded Heater 11 Temperature Sensing Element 12 Corded Heater Lead Wire 13 Temperature Lead wire of sensing element 14 Hole 15 Silicone rubber sponge 16 Temperature sensing element

Claims (1)

(57) [Scope of utility model registration request] 1. A silicone rubber having excellent thermal conductivity and heat resistance.
A temperature sensing element is placed inside the
Bond the inner surfaces of the rubber tubes with silicone rubber
In addition, the whole was molded into the same shape as the temperature sensing surface.
A surface type temperature detector characterized in that