JPH0429235Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a thermocouple fixture whose joint portion is exposed without using a protective tube.

(Prior art) As a conventional thermocouple fixing device, a rectangular parallelepiped insulator has screw holes for fixing it to a substrate, and each tail end of the thermocouple is made of two types of metal wires whose tips are joined. It is known to have a through hole for insertion (see Japanese Utility Model Application Publication No. 148859/1983).

(Problems to be Solved by the Invention) However, in the conventional fixing device a, after each tail end side of the thermocouple b is inserted into the through hole, the thermocouple b is attached to a water heater, for example. In order to apply to combustion detection, when the heated joint c faces the exhaust opening e provided in the combustion cylinder d, which is the substrate, it is screwed to the mounting plate f fixed to the combustion cylinder d, and the screw This is undesirable because there is a risk that the clamping force applied during fastening may damage the fixture a, and this fixture a is also prone to cracking due to sink marks during manufacturing, and it is difficult to obtain accurate dimensions, which are disadvantageous. It was hot.

(Means for Solving the Problems) The present invention is an attempt to solve the above-mentioned disadvantages of the conventional fixing device, and consists of a rectangular metal plate provided with a through hole for fixing it to a substrate, and two opposing On the side,
A thermocouple consisting of two types of thick metal wires with their tips joined together is provided with a claw piece that holds each tail end side of the thermocouple, and a stand is provided on the other two opposing sides to maintain an appropriate distance between the two tail ends. It consists of separate pieces.

(Function) The present invention has the above-mentioned configuration, and this fixing tool clamps each tail end side of the thermocouple with its claw pieces, maintains the distance between the two tail end sides at an appropriate distance with its vertical pieces, and then For example, when a thermocouple is used to detect incomplete combustion in a water heater, and its heating part faces an exhaust opening provided in a combustion shell, it is installed directly on the combustion shell or on a mounting plate fixed to the combustion shell. Since it is made of a metal plate, there is no risk of damage even if force is applied during fixation, and since this fixture is manufactured by sheet metal processing, it will not crack. Moreover accurate dimensions are obtained.

(Example) Next, an example of the present invention will be described based on the drawings.

In Figures 1 and 2, 1 is a thermocouple, 2
It is made by joining relatively thick metal wires 2 and 3 of different types at their tips.

The thermocouple 1 has tail ends 1b, 1b of both metal wires 2, 3.
Lead wires are connected to each of them by brazing or the like, and both sides including these connecting portions are covered with a flexible insulating tube 5 such as a glass fiber tube, and are integrated via a fixture 6 made of sheet metal.

As shown in FIG.
Each side is provided with two claw pieces 6a, 6a, the other two opposing sides are each provided with a vertical piece 6b, and the two vertical pieces 6b, 6b are positioned between the two insulating tubes 5, 5. In this state, the four claw pieces 6a, 6a, 6a, 6a are wrapped around the tail ends of both metal wires 2, 3 inside both insulating tubes 5, 5 and both lead wires 4, 4, thereby removing the coating. The tail ends of both metal wires 2 and 3 and both lead wires 4,
4 are fixed and maintained at appropriate intervals.

Since this fixture 6 is fixed in a relatively high temperature atmosphere, the insulating tubes 5, 5 are used to protect the lead wires 4, 4 thermally and electrically.

FIG. 4 shows a case where the thermocouple device having the above-mentioned configuration is applied to the gas water heater 7, in which the joint portion 1a of the thermocouple 1 is inserted into the through hole 9 provided in the combustion barrel 8 of the gas water heater 7. The fixing device 6 is directly fixed to the combustion cylinder 8, which is a base plate, with a screw 11 through a through hole 10 in the center thereof.

In this case, since the fixing device 6 is made of a thin steel plate, it will not be damaged when it is fixed with the screws 11, and since the fixing device 6 is formed by sheet metal processing, there will be no cracks or dimensional defects during manufacturing. No errors occur.

In FIG. 4, 12 indicates a burner, and 13 indicates a water pipe.

In the above-mentioned embodiment, both sides of the metal wires 2, 3 and the lead wires 4, 4, including their connection parts, are covered with insulating tubes 5, 5, and the covered parts are connected to each other through the fixture 6. However, the tail end sides of both metal wires 2 and 3 or the tip sides of both lead wires 4 and 4 are connected to insulating tubes 5 and 5.
The coated portion may be integrated with a fixture 6.

(Effects of the invention) As described above, according to the present invention, since the fixing device is made of a metal plate, the fixing device is not damaged by the force applied when screwing it to the board, unlike the above-mentioned conventional device made of an insulator. In addition, since the fixture is manufactured by sheet metal processing, there is no damage such as cracks that occur when manufacturing the fixture itself, which is the case with conventional fixtures, and it has the effect of obtaining accurate dimensions. have Furthermore, the structure is simple and the effect can be obtained at low cost.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of the implementation of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a perspective view of the main parts thereof.
FIG. 4 is an explanatory diagram when the thermocouple device of FIG. 1 is applied to incomplete combustion detection in a gas water heater, and FIG. 5 is a side view of the conventional thermocouple device. 1... Thermocouple, 2, 3... Metal wire, 6... Fixture, 6a... Claw piece, 6b... Vertical piece.

Claims (1)

[Scope of utility model registration request] On one of two opposing sides of a rectangular metal plate provided with a through hole for fixing it to the substrate, a claw piece is attached to hold each tail end side of a thermocouple made of two types of thick metal wires whose tips are joined. A fixture for a thermocouple, which is provided at each side, and on the other two opposing sides, is provided with a standing piece for maintaining an appropriate distance between the two tail ends.