JPS6025428A - Non-contacting type temperature sensor - Google Patents

Abstract

PURPOSE:To improve the accuracy of temp. control by supporting a temp. sensing element by a heat resistant means which closes hermetically the opening of a hood and providing a pressure regulating hole to at least a part of the hood. CONSTITUTION:A box-shaped hood 6 having a U-shaped section is constituted of a heat resistant plastic, etc. and a heat resistant tape 7 is stuck to the opening thereof so as to close hermetically said opening and in a way as not to deflect. A temp. sensing element 3 such as, for example, a thermistor or the like is placed on the tape 7 so as to be positioned at the center of the opening and further a heat resistant tape 8 having a tacky part is stuck on one surface thereof. A pressure regulating hole 9 having about 0.1mm. diameter is opened in a part of the hood 6 so that the deflection of the tapes 7 and 8 is obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application) The present invention relates to a non-contact temperature sensor used in a temperature control device or the like.

(Prior Art) Conventionally, temperature sensors for temperature control devices include a type that contacts a heating element and a non-contact type.

FIG. 1 is a schematic explanatory diagram of a conventional non-contact type temperature sensor. 1 is a heating element, and the heating roll 2 is heated by the heating element 1. Reference numeral 3 denotes a temperature sensing element that detects the temperature of the heating roll 2, and is provided at a location away from the heating openings 2. A hood 4 made of heat-resistant plastic or the like is provided on the opposite side of the temperature sensing element 3 from the heating roll 2.

The conventional non-contact type temperature sensor having such a configuration has a drawback that the accuracy or sensitivity changes significantly due to air turbulence around the temperature sensing element 3, etc. In addition, there are drawbacks such as a longer response time to temperature changes of the heating element 1.
.

On the other hand, the conventional temperature sensor that comes into contact with the heating element'
This has the disadvantage that since the temperature sensor moves against the heating element, wear occurs due to friction between the two.

(Objective) The object of the present invention is to eliminate the drawbacks of the prior art described above, to reduce the change in sensitivity of the temperature sensing element due to air turbulence around the humidity sensing element, and to reduce the response time to temperature changes of the heating element. Provides a short non-contact temperature sensor.

(IIIA Essential) A feature of the present invention is that the temperature sensing element is supported by a heat-resistant means that seals the opening of the hood, and that a pressure adjustment hole is provided in at least a portion of the foot.

(Example) The present invention will be explained below using examples. FIG. 2 shows a schematic explanatory diagram of an embodiment of the present invention. 43 in the figure, 1
, 2 are a heating element and a heating roll C, respectively, and a non-contact temperature sensing element 5 according to this embodiment is provided apart from the heating roll 2.

Next, the structure of the non-contact type moisture sensing element 5 will be explained in detail with reference to FIG. The box-shaped hood 6, which has an opening-shaped cross section, is made of heat-resistant plastic or the like, and is molded so that the opening thereof is approximately 1 CIIl square.

This opening is filled with lC to seal the internuclear region.
1. A heat-resistant tape 7 is pasted (=J) so as not to bend. As the heat-resistant tape 7, for example, a polyimide adhesive tape or the like is suitable.

On the heat-resistant tape 7, a temperature sensing element 3, such as a 1-no-mister, is placed at the center of the opening,
Furthermore, a heat-resistant tape 8 with an adhesive part on one side is pasted on the temperature-sensitive element 3 so that the adhesive part is flush with the heat-resistant tape 8 (=J
[] Can be done. Thereby, the temperature sensing element 3 is fixed at the center of the opening of the hood 6.

A pressure adjustment hole 9 with a diameter of 0.1 mm is provided in a part of the box-shaped hood 6. This pressure adjustment hole 9 prevents the air in the hood G from expanding or contracting due to the heating or cooling of the heating roll 2, thereby preventing the heat-resistant tapes 7 and 8 from becoming deflected.

FIG. 4 shows a graph for comparing the accuracy of the non-contact temperature sensor according to this embodiment with a conventional non-contact temperature sensor. In the figure, the vertical axis shows temperature, the horizontal axis shows time, the dotted line 10 shows the temperature of the surface of the heating 1'' when temperature is controlled using a conventional non-contact humidity sensor, and the solid line 11
shows the temperature of the heating roll surface when temperature control is performed using the non-contact temperature sensor according to this embodiment.

In addition, To is the set temperature, O'' to seconds is the period when the heat generating fho1 is energized to start generating heat, and the temperature is controlled to the set temperature To. This shows the period during which the temperature was controlled to the set temperature To by sending an air volume of

As is clear from the period of Q<(<t. in FIG. 1) Only °C fluctuation was observed. Also, a I+'t' and b in the figure
As is clear from the comparison, the conventional device takes a longer time to detect a temperature change on the heating roll surface and enter temperature control than the device of this embodiment. Therefore, the purchase of this embodiment is
It can be said that the response time to temperature changes is shorter than that of conventional devices.

In addition, a fourth
As is clear from the period t>to in the figure, in the conventional apparatus, the temperature of the heating roll was T'o -1-12°C. On the other hand, in the device of this embodiment, l'o -) 4'
C, it was possible to control thirst much more accurately than when using conventional equipment.

As mentioned above, the reason why the apparatus of this embodiment is able to control temperature with higher accuracy than the conventional apparatus is considered to be due to the following reasons. That is, in this embodiment, at least the side of the temperature rollers 1 and 3 that does not face the heating roll is covered by the hood 6, so that the movement of air can be stopped. On the other hand, in the -c1 conventional device, as is clear from FIG. 1, the air around the temperature sensor 3 is constantly moving, so the temperature picked up by the temperature sensor 3 becomes unstable.

Generally, within an apparatus in which heating rolls and the like are installed, air movement cannot be ignored due to the surrounding environment or temperature differences between parts within the machine, even if no particular air is being sent. For this reason, it is considered that there is a difference in accuracy at time Q<t<to in FIG. 4. Furthermore, when a constant amount of air is sent, the difference in accuracy increases.

d3. In the above embodiment, the temperature sensor 3 is supported by the heat-resistant tape 7.8, but the present invention is not limited to this, and a heat-resistant plate may be used. Further, both a heat-resistant plate and a heat-resistant tape may be used. Furthermore, the shape of the hood 6 is not limited to a box shape;
Other shapes such as J3/V shape may also be used.

(Effects) According to the present invention, one side of the temperature range is covered with a hood to prevent air movement, so that ) Fi! The accuracy of one-time control can be improved. Furthermore, the response time to temperature changes of the heating element can be reduced.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a conventional device, Fig. 2 is a schematic explanatory diagram of an embodiment of the present invention, Fig. 3 is a sectional view of a non-contact quality sensor according to an embodiment of the present invention, and Fig. 4 The figure is a graph showing the humidity of the heating roll when the temperature is controlled using the conventional temperature sensor and the temperature sensor of this embodiment. 3... Temperature sensor 1, 5... Non-contact temperature sensor,
6...Hood, 7.8...Heat-resistant tape, 9...Pressure adjustment hole Patent attorney Michito Hiraki and 1 other person

Claims (3)

[Claims] (1) A hood having a frontage on at least one side or a part thereof, a temperature sensing element supported by the frontage of the hood,
A means for supporting the temperature sensing element in the opening and sealing the opening, and a means for at least a portion of the hood.
A non-contact temperature sensor characterized by having a pressure adjustment hole. (2) The non-contact temperature sensor according to item 1 of the patent, wherein the means for sealing the opening is a heat-resistant plate or a heat-resistant plate. (3) The non-contact type temperature sensor according to claim 1, wherein the temperature sensing element is supported between heat-resistant plates, between heat-resistant tapes, or between a heat-resistant plate and a heat-resistant tape.