JPH0434694B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resistance temperature sensor surface sensor in which a resistance wire element is enclosed in a space formed in a metal plate.

Conventionally, thermocouples have been mainly used as surface sensors to measure the surface temperature of objects. The reason for this was that it was difficult to manufacture small platinum resistive elements, and some were manufactured using resistors, but the response speed was fast because the resistors were placed between silicone rubber. Moreover, if the resistor is bent, the resistance value changes, making it difficult to handle.Furthermore, although there are resistors that are vapor-deposited on the ceramic surface, they chip easily, are sensitive to moisture, and have poor accuracy. This is because it has a bad and huge drawback.

By the way, even when using thermocouples,
The contact between the welded point in the sensor part and the surface to be measured is unstable, the sensor part is thin and is easily affected by the surrounding atmosphere, and it deteriorates over time compared to those using resistors. Because the sensor part is exposed, it has weak mechanical strength and can be easily damaged by being caught during handling.Furthermore, it requires the use of cold junctions or compensation wires, which can lead to measurement errors. It has disadvantages such as being easily generated.

This invention was made in order to eliminate the above-mentioned drawbacks. This invention will be explained below.

FIGS. 1a and 1b are a partially cutaway front view and a side sectional view taken along the line I-I, showing an embodiment of the present invention. In these figures, reference numeral 1 denotes a resistance temperature sensor surface sensor (hereinafter simply referred to as a sensor), which is configured as follows. For example, a resistance wire 3 such as platinum wire is continuously wound around a cylindrical winding core 2 made of glass or the like, and a small one consists of two platinum resistance wires 3 with a wire diameter of about 0.0025 mm. is wound around one of the two winding cores 2 from one end to the other at a predetermined interval, and the ends of both resistance wires 3 are welded to a predetermined resistance value to form a welded part. 4 to form one resistance wire element. A resistance wire 3 is similarly wound around the other winding core 2, and connected in series with the resistance wire 3 of the one winding core 2. 5 is the lead wire of the resistance wire 3, 6
is a disc-shaped metal plate made of steel, silver, stainless steel, etc., with a bottomed hole 8 formed in the thickness direction from the back side,
Further, the metal plate 6 is arranged so that the space 7 which is perpendicular to the thickness direction and communicates with the bottomed hole 8 forms a V-shape.
It is formed within the thickness of After inserting the two cores 2 into the space 7 through the bottomed holes 8, the space 7 is filled with an insulating material 9 such as inorganic or organic material, the cores 2 are fixed, and the sensor 1 of the present invention is formed. be done. 10
is a pillar conductor, to which a lead wire 5 is connected by appropriate means via a relay wire 11 such as a ribbon wire. Reference numeral 12 indicates a heat-resistant pipe made of a material such as fluororesin. Note that 10 to 12 are those used during use.

FIG. 2 is a side view showing an example of how the sensor 1 is used. In this figure, the heat-resistant pipe 12 is further replaced by a long pipe 13 made of phenolic resin.
A vinyl lead 14 is inserted inside the sensor 1, and the lead wire 5 of the sensor 1 shown in FIG. 1 is connected to each core wire of the vinyl lead 14, respectively.

In use, the pipe 13 is held in hand and the metal plate 6 of the sensor 1 is applied to the surface of the object to be measured, and the temperature is measured from the resistance value of the resistance wire 3 at that time.

Figures 3a and b and Figures 4a and b respectively show other embodiments of the invention, with each figure a being a partially cutaway plan view, and each figure b being a side sectional view taken along the - and - lines. be. In these figures, the same reference numerals as in FIG. 1 indicate the same parts.

In the embodiment shown in FIG. 3, a space 7 is formed linearly at the center of the metal plate 6, and two winding cores 2 having wires wound symmetrically with respect to the center are accommodated within this space 7. be. In this embodiment, the core 2 can be easily inserted.

The embodiment of FIG. 4 has two
The winding core 2 is accommodated in each space 7. In the case of this embodiment, since the length of one winding core 2 can be increased, the distribution ratio of the resistance wire 3 on the surface of the metal plate 6 is improved.
Since the response speed can be improved and the number of turns of the resistance wire 3 can be increased, a resistance wire element with high resistance can be obtained.

FIG. 5 shows still another embodiment of the present invention, in which the sensor 1 is attached to the heat-resistant pipe 12 by providing the heat-resistant pipe 12 at the center of the disc-shaped sensor 1 and perpendicular to its surface. It is.

Note that, as shown in FIG. 6, the extraction portion of the lead wire 5 does not necessarily have to be at the center of the sensor 1.

As explained above, the present invention provides a metal plate having high thermal conductivity with a bottomed hole in the thickness direction from the back side and a plurality of spaces communicating with the bottomed hole in a direction perpendicular to the thickness direction. On the other hand, each resistance wire element, in which platinum resistance wire is wound around a plurality of winding cores and connected in series, is housed in each space, and each space is filled with an insulator to form a sensor. Therefore, the structure is simple and the mechanical strength is strong, and since the resistance wire element is embedded in the metal plate, it can be constructed in an ultra-compact size, does not break during use, and the resistance wire element The contact area with the object to be measured through the metal plate is increased, and the sensitivity and accuracy to the object to be measured is much better than with conventional thermocouples, and the effect of ambient temperature is reduced. It has various advantages such as being free from damage, can be manufactured at low cost, and has a fast response speed.

[Brief explanation of drawings]

FIGS. 1a and 1b are a partially cutaway front view and a side sectional view taken along the - line of a sensor showing an embodiment of the present invention,
FIG. 2 is a side view showing an example of how the method shown in FIG. 1 is used;
Figures 3a, b and 4a, b respectively show other embodiments of the present invention, each figure a is a partially cutaway front view, and each figure b is a side sectional view taken along lines - and -. , FIG. 5, and FIG. 6 are perspective views showing still other embodiments of the present invention. In the figure, 1 is a sensor, 2 is a winding core, 3 is a resistance wire, 4
1 is a welded part, 5 is a lead wire, 6 is a metal plate, 7 is a space, 8 is a bottomed hole, 9 is an insulator, 10 is a support, 1
1 is a relay wire, and 12 is a heat-resistant pipe.

Claims (1)

[Claims] 1 A bottomed hole is formed in a metal plate with high thermal conductivity in the thickness direction from the back side, and a plurality of spaces are formed in a direction perpendicular to the thickness direction and communicate with the bottomed hole, and on the other hand, a plurality of Resistance wire elements having platinum resistance wire wound around a winding core and connected in series are housed in the space, and each space is filled with an insulator. surface sensor.