JPS5852599Y2 - Temperature fuse installation device - Google Patents

Description

[Detailed description of the invention] This invention is a thermocouple circuit of a pilot safety device for the purpose of blocking the gas passage and preventing fire etc. in the event that the heat exchanger of a gas water heater etc. is damaged due to abnormal overheating, etc. The present invention relates to a temperature fuse attachment device that is a sensing element of an overheat prevention device built into a device.

Conventional thermal fuse installation devices for overheating prevention are shown in Figure 2.
The structure shown in Fig. 3 was used, but it was used in a place where the gap 3 between the heat exchanger 1 and the back plate 2 of a gas water heater as shown in Fig. 1 was extremely narrow. If there is a mounting device as shown in Fig. 3, the overall height 4 becomes high and it is not possible to obtain a sufficient insulation distance, which is a problem, so the mounting device as shown in Fig. 2 is often used. .

Its structure is generally such that a lead wire 7 connected to both ends 6 of a temperature fuse 5 is connected by a connecting terminal 8, covered with an insulating sleeve 9, and a U-shaped end 10 is used for heat exchange as shown in FIG. It is fixed using a cut-out piece 11 provided between the container 1 and the back plate 2 or a holding fitting (not shown), but in this case, the temperature fuse 5 is covered with an insulating sleeve 9, so the thermal response is low. Also, as a result of not fixing the temperature fuse 5, if mechanical stress such as tension or twisting is applied to the connection between the ends 6 of the temperature fuse 5 and the connection terminal 8 during handling operations such as molding or assembly, Disconnections, increased contact resistance at contacts within the temperature fuse, and contact with the heat exchanger were factors that led to unstable operation of the temperature fuse.

The present invention provides a temperature fuse mounting device that eliminates these drawbacks and improves heating response.

The details will be explained below based on the embodiments of the present invention.

In FIG. 4, reference numeral 12 denotes a board made of electrically insulating material, which has a T-shape in which a protrusion 13 for placing a temperature fuse and a seat for placing a conductive metal fitting 23 are integrally formed, and has a mounting notch 14 and a mounting hole 15. It is.

Two conductive metal fittings 23 are caulked and fixed to the board 12, and a temperature fuse 16 and a lead wire 17 in the illustrated form are attached to each end.
The temperature fuse 16 is held together with the protrusion 13 of the substrate 12 by a heat-resistant insulating ring 18 to prevent floating, thereby forming a thin temperature fuse holder.

The temperature fuse holder is attached to the gap 3 between the heat exchanger 1 and the back plate 2 shown in FIG. A cut-and-raised protrusion 20 and a mounting hole 21 are formed around it, and it is fixed with a mounting screw 22 or the like.

By adopting the above-described structure of the present invention, mechanical stresses such as tension and twisting are not applied to the temperature fuse connection part due to handling operations such as molding and assembly, so no abnormality occurs.

Furthermore, since there is no insulating sleeve covering the temperature fuse, and it can be installed exposed, it exhibits excellent responsiveness to heating and the like.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional side view of a general gas instantaneous water heater;
The figure is a perspective explanatory view of a conventional temperature fuse installation device, Figures 3a and 3) are front and side views of the same, and Figure 4 is a temperature fuse installation device of the present invention, with a being a front view and b being a side view. , C are main part explanatory diagrams. FIG. 5 is a sectional view of the main part. 1... Heat exchanger, 2... Back plate, 3...
... Gap, 4 ... Height, 5 ... Temperature fuse, 6 ... Both ends, 7 ... Lead wire, 8 ... ... Connection terminal, 9 ... Insulation sleeve, 10 ... End, 11 ... Cut-and-raised piece, 12 ... Board, 13 ... ...Protrusion seat, 14...Mounting notch, 15...Mounting hole, 16...Temperature fuse, 17...
...Lead wire, 18...Heat-resistant insulating ring, 19...
...Seat push, 20...Cut and raise protrusion, 2
1...Mounting hole, 22...Mounting screw,
23... Conductive metal fittings.

Claims (1)

[Scope of utility model registration request] In a temperature fuse installation device for an overheat prevention device that is installed in a place where the gap between the heat exchanger and the back plate is extremely narrow, such as in a gas instantaneous water heater, the temperature is set at both ends of a conductive metal fitting fixed to a T-shaped board. A temperature fuse mounting device in which a fuse and a lead wire are connected, the temperature fuse is held by a heat-resistant insulating ring, a thin temperature fuse holder is formed to prevent floating, and this is mounted on a back plate or the like.