JPS6130024Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a highly efficient heat transfer suitable for heating the workpiece before, during, and after welding of pressure vessels and general structures, that is, for preheating and postheating of the workpiece. It concerns a preheating burner of the form.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a conventional air-gas mixing type preheating burner will be described with reference to FIG. 1 and FIG. 2. Air introduced from air conduit 1 passes through air valve 2, while flammable gas such as propane or propylene is introduced from gas conduit 3 and passes through gas valve 4. The respective gases pass through the mixed gas conduit 5 and are introduced into the mixed gas chamber in the crater body 9 while being mixed, and are combusted through the crater 7 to become a flame 8 and preheat the object 11 to be heated.

Blowout prevention plate 1 attached to the crater body 9
0 serves to prevent wind from blowing into the crater 7 to prevent the flame 8 from disappearing due to the wind blowing the crater 7. The distance between the blow-out prevention plate 10 and the object to be heated 11 is normally set to about 100, so that the high-temperature part of the flame 8 hits the object to be heated 11, and so that sufficient air can be supplied from the atmosphere. Installed from 50mm to 200mm.

However, because the distance between the blowout prevention plate 10 and the object to be heated 11 is large, most of the length of the flame 8 is exposed to the atmosphere, and a large amount of heat is wasted into the atmosphere. Ta. For this reason, there was a drawback that the efficiency of heat transfer from the burner to the object to be heated 11 was as low as about 50% or less.

Therefore, in the air-gas mixture preheating burner, a combustion chamber forming plate is installed on the crater side of the crater body to form a combustion chamber with sufficient space for combustion between the heated object and the heated object, thereby improving heat transfer to the heated object. It is conceivable to increase the efficiency of However, in order to maintain a constant gap between the object to be heated and the combustion chamber forming plate, measurement must be performed each time the burner is moved, which is very time-consuming. There is a problem that the burner may be damaged or fall over.

The purpose of this invention is to easily maintain a certain gap between the object to be heated and the combustion chamber forming plate, and also to prevent the burner from being damaged or tipped over due to contact with the object to be heated. It is something.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

Air introduced from air conduit 1 passes through air valve 2, while flammable gas such as propane or propylene is introduced from gas conduit 3 and passes through gas valve 4. As a result, each gas passes through the mixed gas conduit 5 while being mixed, is introduced into the mixed gas chamber 6 in the crater body 9, passes through the crater 7, and becomes a flame 8. Here, the crater body 9, the combustion chamber forming plate pedestal 12 attached to it, and the combustion chamber forming plate 1
3 and the object to be heated 11 form one combustion chamber, thereby increasing the efficiency of heat transfer from the burner to the object to be heated 11.

In this embodiment, a roller holder 14 for maintaining a gap 15 is provided at the tip of the combustion chamber forming plate 13, thereby making it easy to set the burner on the object to be heated 11. The rollers 15 are adapted to roll due to frictional resistance with the object to be heated 11, and even if movement occurs between the two, the movement is smooth without damaging the object to be heated 11. In addition, if the roller holder 14 is made adjustable with a screw or the like on the combustion chamber forming plate 13, the gap between the roller holder 14 and the object to be heated 11 can be adjusted.

Furthermore, by providing a buffer spring 16 serving as a buffer mechanism between the combustion chamber forming plate 13 and the combustion chamber forming plate pedestal 12, contact pressure due to rotation, movement, etc. of the heated object 11 can be alleviated. Can be done.

According to the present invention, a certain gap can be maintained between the burner and the object to be heated, making it easy to set the burner to the object to be heated. Since it has a force-reducing function, it has the effect of preventing burner damage and overturning.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional air-gas mixing type preheating burner, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is an embodiment of a high-efficiency heat transfer type preheating burner according to the present invention. Front view, Figure 4 is B-B in Figure 3
FIG. 1...Air conduit, 2...Air valve, 3...
...Gas pipe, 4... Gas valve, 5... Mixed gas pipe, 6... Mixed gas chamber, 7... Crater, 8...
Flame, 9... Crater body, 11... Heated object, 12...
... Combustion chamber forming plate pedestal, 13... Combustion chamber forming plate, 1
4...Roller holder, 15...Roller, 16...Buffer spring.

Claims (1)

[Scope of utility model registration request] A combustion chamber forming plate holder is attached to the crater body, a combustion chamber forming plate that forms a combustion chamber with the object to be heated is attached to the combustion forming plate holder, and the combustion chamber forming plate holder and the combustion chamber forming plate are attached. A highly efficient heat transfer type preheating burner, characterized in that a buffer spring is provided between the combustion chamber forming plate, and a part is provided at the tip of the combustion chamber forming plate to maintain a gap by contacting the object to be heated.