JPH0718167U - Overheat prevention device - Google Patents

Abstract

(57) [Abstract] [Purpose] Installation structure of overheat prevention device for gas combustion appliances,
It is about improving the position. [Structure] A joint portion 13 of a body plate 11 of a combustion cylinder 1 forming a combustion chamber of a water heater or the like is located substantially in front of the body plate 11
The cutting device 5 is fixed via a mounting base 4 at a position substantially facing the seaming portion 13 in a state in which the water supply pipe 2 wound around is sandwiched.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a mounting structure of an overheat prevention device such as a water heater.

[0002]

[Prior art]

 A conventional example of the overheat prevention device will be described with reference to FIGS. The cutting device 5 of the overheat preventive device is clamped by the holding claw 403 at the tip of the mounting piece 40 bent in a crank shape, and the cutting device 5 is placed between the rear case 6 and the combustion cylinder 10. It is inserted and installed. The cutter 5 is fastened from the front with a screw 7 to a mounting base 62 attached to the side plate 61 of the rear case 6, and is screwed from the front opening side of the rear case 6. At that time, You are forced to work in a cramped position. In the case of FIG. 5, the base end of the mounting piece 40 is exposed to the outside of the rear case 6, and screws are fixed from the lateral direction of the rear case 6, so that the mounting piece 40 has many bent parts and is complicated. Its shape is difficult to make.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional one, it is extremely difficult to fix the tip end of the mounting piece 40 so as to face the back of the combustion cylinder 1, and it is difficult to hold the mounting piece 40 when screwing. I was forced to take a posture. In the overheat prevention device in the above-mentioned conventional example, since the mounting piece 40 needs to be formed in a long crank shape with many bent portions, it is difficult to secure toughness. In addition, it is difficult to confirm the mounting position of the cutting device 5 with the combustion tube 10 inserted, and the removal of the cutting device must be done in an unnatural posture, which is very difficult for the removal work. It is difficult.

Further, since the positional relationship between the cutting device and the joint portion of the body of the combustion cylinder is not specified, gas leakage from the joint portion of the combustion cylinder may not always be detected accurately. It was

[0005]

[Means for Solving the Problems]

 The overheat prevention device according to the present invention is an overheat prevention device having a cutting device 5 that melts and breaks due to an excessive temperature rise of a combustion cylinder 1 mounted in a rear case 6 or an excessive temperature rise due to leakage gas. That is, the seaming portion 13 of the body plate 11 of the combustion cylinder 1 is located in the front, and the cutting device 5 is attached to face the seaming portion 13. The overheat protector of the second invention is constructed such that the cutting device 5 is attached to a mounting base 4 fixed to the water supply pipe 2 wound around the combustion tube 1 with the water supply pipe 2 sandwiched therebetween. It is a thing.

[0006]

[Action]

 The cutting device 5 of the overheat protector device can be easily attached from the front side, and the leakage of combustion gas from the joint portion 13 of the combustion cylinder 1 is reliably detected and combustion is stopped. Also, for those that are sandwiched between water supply pipes, they can be attached and removed by one push and pull operation.

[0007]

【Example】

 A case where an embodiment of the present invention is applied to a water heater will be described with reference to FIGS. Reference numeral 1 denotes a combustion tube that forms a combustion chamber. A fin-tube type heat exchanger 3 is installed above the combustion tube 1, and a gas burner (not shown) that heats the heat exchanger 3 is installed below the combustion tube 1. By the combustion heating of the burner, the water supplied from the water supply pipe 2 is heated to a high temperature. Reference numeral 11 is a body plate bent into a box of a certain size, and at the center of the front surface, one side edge and the other side edge are overlapped with each other without being separated from each other and joined together. The part 13 is formed. After that, the seamed portion 13 is brazed to maintain airtightness in the portion. The reference numeral 5 designates a disconnecting device, in which a thermal fuse that melts at a temperature of 200 ° C. or before is enclosed in an insulating case, and the water supply pipe 2 is sandwiched between the leg pieces 41 of the mounting body 4 and the mounting body 4 Are fixed, and the cutting device 5 is fixed by being sandwiched by the claw pieces 42 formed at the tip ends of the leg pieces 41 of the mounting body 4. In addition, the cutting device 5 is positioned so as to face the seaming portion 13. Thus, it can be confirmed visually that the cutting device 5 is located on the joint portion 13 of the body plate 11. Further, 51 is a lead wire of the cutting device 5, and the cutting wire 5 is interveningly connected by the lead wire 51 to the energizing circuit of a solenoid valve for gas supply (not shown).

As is clear from the above configuration, when the water heater 1 is repeatedly used and the combustion cylinder 1 is repeatedly subjected to thermal stress, the thermal stress causes a crack to occur promptly in the stress collecting portion in the joint portion 13. , The burner is exposed to the combustion gas leaking from the crack, the temperature rises excessively, the cutting device 5 melts down, the energization circuit of the solenoid valve for gas supply (not shown) is cut off, and the combustion of the burner is stopped immediately. Being kept safe. Although the mounting body 4 is mounted and fixed to the water supply pipe 2 in the above embodiment, the mounting body 4 may be fixed to the body plate 11 by means of screws or the like.

[0009]

[Effect of device]

 According to the overheat prevention device of the present invention, a cutting device can be attached to and detached from the water heater without breaking the posture from the front. It is extremely easy to attach and detach, and it is possible to remove the installation work from an unnatural posture as in the past. Is effective. Also, since the cutting device is located opposite the seam of the shell plate, it is installed near the earliest crack in the shell plate, and it is possible to accurately detect a gas leakage accident and improve safety. It is a valid one.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a main part of the embodiment shown in FIG.

FIG. 3 is a schematic exploded perspective view showing a conventional embodiment.

FIG. 4 is an enlarged perspective view showing a main part of the embodiment shown in FIG.

FIG. 5 is a schematic exploded perspective view showing another conventional embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion tube 2 Water supply pipe 4 Attachment piece 5 Cutting device 6 Rear case 11 Body plate 13 Seam section

Claims (2)

[Scope of utility model registration request] 1. An overheat prevention device having a cutting device (5) that melts and breaks due to an excessive temperature rise of a combustion cylinder (1) mounted and fixed in a rear case (6) or an excessive temperature rise due to a leak gas. The overheat prevention device in which the seaming portion 13 of the body plate 11 is positioned in front, and the cutting device 5 is attached so as to face the seaming portion 13. 2. An overheat preventive device in which the cutting device 5 is attached to a water supply pipe 2 wound around a combustion cylinder 1 while being attached and fixed to a mounting base 4 with the water supply pipe 2 sandwiched therebetween.