JP2511874Y2 - Resistance temperature detector for high temperature - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a high temperature resistance temperature detector with high accuracy, good stability even at high temperature, and excellent in productivity.

[Conventional technology]

3 (a) to 3 (c) show an example of a conventional resistance temperature detector for high temperature, and FIG. 3 (a) is a front view and FIG. 3 (b).
Is a side view, and FIG. 3 (c) is a rear view. In these figures, 1 is a long bobbin made of a material such as alumina, 2 is an insulator made of an insulating material such as ceramic, and 3 is a platinum resistance wire, for example, a wire diameter of about 0.025 mm and a predetermined resistance. It is set to a length that has a value. 4 is the platinum resistance wire 3
For the platinum resistance wire 3 formed in plural numbers in the longitudinal direction of the bobbin 1 because 5 is a lead wire, 6 is a lead wire, 6 is a lead wire inserted in the insulator 2, and 7 is the platinum resistance wire 3 inserted therein. Through holes, 8 is a through hole for the lead wire 5 formed in the longitudinal direction of the bobbin 1 for inserting the lead wire 5, and 9 is a through hole for the lead wire through which the lead wire 6 is inserted. , 10 are end faces of the bobbin 1.

At the time of manufacture, the platinum resistance wire 3 is cut into a predetermined length, formed like a hairpin, inserted through one of the through holes 7 for the platinum resistance wire 3, and the platinum resistance wire 3 coming out from the other side.
Each platinum end is welded in series outside the bobbin 1 so as to form one wire, and one platinum resistance wire 3 is formed. Further, the lead wire 5 is inserted into the through hole 8 for the lead wire 5, and one end thereof is connected to the platinum resistance wire 3 by welding. On the other hand, the lead wire 6 is inserted into the through hole 9 for the lead wire 6 of the insulator 2, and one end thereof is connected to the lead wire 5.

[Problems to be solved by the device]

By the way, the above-mentioned conventional resistance thermometer for high temperature uses the bobbin 1
The outer diameter is around 1 to 4 mm and the number of through holes 7 for platinum resistance wire 3 is 1
Since many holes with 0 to 50 holes are used, there are four turning points.
And the number of welded parts increases. For this reason, the platinum resistance wire 3 expands more as the temperature rises, while the bobbin 1 expands less, causing an accident in which the platinum resistance wire 3 loosens and comes into contact with each other due to vibration or impact.

Also, regardless of whether the lead wire 6 is loosened due to the weight or twist of the insulator 2 regardless of whether the temperature is high or low, an accident occurs in which the lead wire 5 comes into contact with the platinum resistance wire 3.

Also, a through hole 7 for the platinum resistance wire 3 and a through hole 8 for the lead wire 5
Since and are on the same plane with respect to each end face 10 of the bobbin 1, when the platinum resistance wire 3 is pushed by the insulator 2, the platinum resistance wire 3 is crushed and the resistance value changes or is broken. There was a problem.

The present invention has been made to solve the above problems, and prevents the platinum resistance wires from contacting each other or the platinum resistance wire and the lead wire by preventing the contact between the platinum resistance wires by providing protrusions on both end surfaces of the bobbin. The purpose is to obtain a resistance temperature detector for high temperature.

[Means for solving the problem]

The high temperature resistance temperature detector according to the present invention has both end faces of the bobbin as end faces for the platinum resistance wire, and the end faces for the platinum resistance wire are provided with protrusions each having an end face for the lead wire. It is a thing.

[Action]

In this invention, by forming the protrusions on both end faces of the bobbin, even if the platinum resistance wires expand and loosen, the platinum resistance wires or the platinum resistance wire and the lead wire are prevented from being twisted and brought into contact with each other. be able to.

〔Example〕

1 (a) to 1 (c) show an embodiment of the present invention, wherein FIG. 1 (a) is a front view, FIG. 1 (b) is a side view,
FIG. 1 (c) is a rear view. In these figures, the same reference numerals as in FIG. 3 indicate the same parts, 11 is a bobbin, 12 is an end face for the platinum resistance wire 3 in which the through hole 7 for the platinum resistance wire 3 is formed, and 13 is the platinum. A projecting portion provided on the end surface 12 for the resistance wire 3 is an end surface for the output wire 5 in which the through hole 8 for the output wire 5 is formed in the projecting portion 13.

Since the end surface 12 for the platinum resistance wire 3 and the end surface 14 for the lead wire 5 are not flush with each other in the resistance temperature detector for high temperature configured as described above, the platinum resistance wire 3 sags even at high temperatures. As a result, the platinum resistance wires 3 do not come into contact with each other or the platinum resistance wire 3 and the lead wire 5 do not come into contact with each other.

Further, even if the insulator 2 is twisted, the platinum resistance wire 3 and the lead wire 5 do not come into contact with each other.

2 (a) and 2 (b) show another embodiment of the present invention. FIG. 2 (a) is a front view and FIG. 2 (b) is a side view. In these figures, the same reference numerals as those in FIG. 1 indicate the same parts, and 15 indicates the platinum resistance of the inner circumference when the platinum resistance wire 3 is long and the through holes 7 for the platinum resistance wire 3 are doubled. A projection portion formed by projecting a portion of the through hole 7 for the wire 3 from the end face 12 of the platinum resistance wire 3 on the outer periphery, and 16 is a platinum resistance in which the through hole 7 for the platinum resistance wire 3 is formed on the projection portion 15. This is an end face for the wire 3, and this end face 16 is provided with a protrusion 13 as in FIG.

The operation and effect of FIG. 2 are the same as those of FIG.

[Effect of device]

As described above, according to the present invention, since both end faces of the bobbin are end faces for the platinum resistance wire, and the end faces for the platinum resistance wire are provided with the protrusions respectively forming the end faces for the lead wire, Since the platinum resistance wires or the platinum resistance wire and the lead wire loosen due to expansion and contact due to twisting or the like can be prevented, there is an advantage that the quality can be improved.

[Brief description of drawings]

1 (a) to 1 (c) show an embodiment of the present invention. FIG. 1 (a) is a front view, FIG. 1 (b) is a side view, and FIG. 1 (c) is a rear view. 2 (a) and 2 (b) show another embodiment of the present invention. FIG. 2 (a) is a front view, FIG. 2 (b) is a side view, and FIG. 3 (a). )-(C) show an example of a conventional platinum resistance thermometer, FIG. 3 (a) is a front view, FIG. 3 (b) is a side view, and FIG. 3 (c) is a rear view. is there. In the figure, 2 is an insulator, 3 is a platinum resistance wire, 4 is a turning point, 5 is a lead wire, 6 is a lead wire, 7 is a through hole for a platinum resistance wire, 8 is a through hole for a lead wire, 9 Is a through hole for lead wire, 11 is a bobbin,
12 is an end face for the platinum resistance wire, 13 is a protrusion, and 14 is an end face for the lead wire.

Claims (1)

(57) [Scope of utility model registration request] 1. A long bobbin made of an insulating material is formed with a plurality of through holes for a platinum resistance wire and through holes for a lead wire in the longitudinal direction, and the platinum resistance wire is provided in these through holes. And the lead wire are individually inserted, and the platinum resistance wires inserted in the through holes for the platinum resistance wire are connected in series outside the bobbin to form one platinum resistance wire. Forming a line,
In the resistance temperature detector for high temperature in which the lead wires are connected to both ends of the one platinum resistance wire, both end surfaces of the bobbin serve as end surfaces for the platinum resistance wire, and these platinum resistance wires are used. A resistance temperature detector for high temperature, characterized in that each of the end faces for use is provided with a protrusion having the end face for the lead wire.