JPH0480286B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to burner chips used in boilers, etc., in which carbide tubes are inserted inside a plurality of injection holes in the burner chip body in order to particularly improve wear resistance. The present invention relates to a burner chip having a structured injection hole.

Generally speaking, burner chips for burning heavy oil used in boilers etc. are manufactured in one piece using high speed steel etc., as durability is not a particular issue.
Those that have been hardened are used. However, mixtures of heavy oil and coal, or mixtures of coal and water, etc.
In burner chips that use solid fuel as a part of the fuel and inject and burn it, there is a problem in that the nozzle holes etc. are significantly worn and the durability is reduced. For this reason, in order to improve the wear resistance of the nozzle hole and its surroundings, burner chips have appeared in which the nozzle hole portion is made of a tube made of a carbide material with excellent wear resistance, such as ceramics. However, since carbide materials such as ceramics generally have a smaller coefficient of thermal expansion than the burner chip itself, and are hard and brittle,
There are difficulties in its installation method. In other words, if the tube that makes up the nozzle hole and the burner tip body are completely joined together, the tube will crack due to the generation of thermal stress due to the difference in thermal expansion, and if the two are not properly attached, it may cause problems during use or maintenance. Not only may the tube fall off from the burner tip body during use, but also the tube may vibrate during use, which may even cause cracking.

The present invention provides a burner chip having a mounting structure capable of reliably preventing the tube from falling off without causing cracks in the cemented carbide tube made of ceramic or the like constituting the nozzle hole. It is something to do.

That is, the present invention provides a burner chip in which a tube made of superhard material such as ceramics is inserted into the injection hole, and a similar stepped hole is provided at both ends of the tube opposite to a stepped hole with a different diameter provided on the fuel inlet side of the burner chip. After making a notch and inserting the tube into the burner chip body from the fuel injection side,
By fitting a ring material between the cut portion of the tube and the burner tip body and joining the ring material to the burner tip body, the relative relationship between the tube and the burner tip body is reliably maintained, and This prevents the occurrence of thermal stress due to differences in thermal expansion and reliably prevents the tube from cracking during repeated use.

An embodiment of the present invention will be described below.

FIG. 1 shows the structure of a burner chip main body in one embodiment according to the present invention, in which 1 is the burner chip main body, 2 is a fuel mixing chamber, and 3 is a plurality of holes into which tubes constituting nozzle holes are inserted. , 3a is the hole 3
This is a stepped hole provided on the fuel inlet side. FIG. 2 shows a tube 4 made of a superhard material such as ceramics that constitutes the nozzle hole of a burner tip, and has cut portions 4a and 4b provided at both ends thereof.

Figure 3 shows the burner tip body 1 and the burner tip 2 in Figure 1.
Fitted between tubes 4 constituting the nozzle hole in the figure,
This is a ring material 5 that is joined to the burner chip body 1. Up to FIG. 3, the shapes of the constituent parts of the burner tip of one embodiment of the present invention are shown, but in FIG.
This figure shows the assembly status of the above component parts.

In Figure 4, 1 is the burner tip body, 2
indicates the fuel mixing chamber. The tube 4 is inserted into a stepped hole 3a provided in the burner tip body 1 constituting a guide for the tube 4 made of carbide, and the notch 4a at the tip is fitted into the stepped hole 3a. There is a third groove between the notch 4b at the other tip and the burner tip body.
The ring 5 shown in the figure is fitted, and the ring 5 and the burner chip body 1 are completely joined by brazing, welding, or the like. FIG. 5 is an enlarged view of the part in FIG. 4 showing an example of a joining situation, and in this case, a situation where the parts are joined by welding 6 is shown. This welding may be performed continuously over the entire circumference of the ring 5, but considering the role of simply preventing the tube 4 from coming off, it is sufficient to perform the welding intermittently at several locations by spot welding. On the other hand, joining by brazing is also a good method for increasing productivity.

As described above, the present invention provides a highly durable burner chip in which the injection hole is made of a tube made of a highly wear-resistant carbide material, such as ceramics, which is different from the burner chip main body, and the mounting structure of the tube, which is hard and brittle, is improved. According to the present invention, since the ring and the burner chip body are not directly joined, the tube does not crack due to thermal stress caused by a difference in thermal expansion, and There is no need to worry about the tube falling off. Moreover, since the present invention has an extremely simple structure, it is extremely effective in terms of cost and productivity.

[Brief explanation of drawings]

FIG. 1: A sectional view showing the structure of a burner tip main body according to an embodiment of the present invention. 1: Burner tip main body, 2: Fuel mixing chamber, 3: Mounting hole of the tube constituting the nozzle hole, 3a: Stepped hole provided in the mounting hole of the tube. FIG. 2: A cross-sectional view of a tube constituting a nozzle hole according to an embodiment of the present invention. 4: Tube body, 4
a, 4b: Notches at both ends of the tube. FIG. 3...A sectional view of the ring 5. FIG. 4: A sectional view showing the overall structure of a burner chip according to an embodiment of the present invention. 1: burner tip body, 2: fuel mixing chamber, 3a: stepped hole provided in the tube mounting hole, 4: tube body forming the nozzle hole, 4a: cut at the tip of the tube to be fitted with the stepped hole 3a Department,
4b: Notch at the tip of the tube to be fitted with the ring 5; 5: ring to be joined to the burner tip body 1; Fig. 5...An enlarged view of the part in Fig. 4. 1: Burner tip body, 4: Tube body, 5: Ring, 6:
welded part.

Claims (1)

[Claims] 1 In a burner chip with a structure in which a carbide tube is inserted inside a plurality of injection holes provided in the burner chip body, stepped holes with different diameters are provided on the fuel inlet side of the burner chip body, and After making a notch at one end of the tube of the material and inserting the tube into the tip body, a ring material is fitted between the notch provided at the other end of the tube and the tip body, and the ring material is inserted into the tip body. A burner chip characterized by joining a body of the chip and a body of the chip.