JPS6143054Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas burner, and more particularly to a glass suitable for glass processing.

A typical prior art is the original mixed gas burner shown in Utility Model Application No. 50-111728. In this original mixed gas burner, a flat plate-shaped porous material is attached to the upper end of a cylindrical body having an axis extending vertically, and a wire mesh is disposed at the lower part of the cylindrical body. A flame hole is formed in the center of the porous material.

In such prior art, in porous materials,
A wire mesh is required to rectify and eject the flammable mixture from around the flame hole. This wire mesh is provided as a single sheet, and rectification is insufficient. If a large number of wire meshes are provided, the pressure loss of the flammable air-fuel mixture will increase, making it difficult to obtain the desired flame length. Moreover, the pressure loss of the flammable mixture due to the wire mesh results in a reduction in the flow rate of the mixture from the flame hole. Therefore, it is not possible to obtain an appropriate flame for glass processing, etc. Further, in this prior art, the porous material is held between the upper end of the sheath surrounding the cylinder and the upper end of the cylinder. Therefore, it is desirable to reduce the number of parts.

An object of the present invention is to provide a gas burner that can produce a sharp flame suitable for glass processing and has a simplified configuration.

The present invention consists of a holding hole 4 that extends vertically and is formed in a cylindrical shape, and has a uniform inner diameter in the axial direction from the tip to the rear end, and a holding hole 4 that is larger in diameter than the holding hole 4 and has a uniform inner diameter in the axial direction. A cylindrical body 2 is formed concentrically with a gas chamber 5 having an inner diameter uniform in the direction, and a connecting cylindrical part 7 having an inner diameter smaller than that of the holding hole 4 protrudes downward at the rear end; The nozzle chip is housed in a nozzle chip made of heat-resistant sintered metal and has a uniform outer diameter in the axial direction, and has a gas distribution hole 8 formed concentrically, with the gas distribution hole 8 facing downward from the top. The jetting part 9 has a small diameter and the conical part 10 has a larger diameter downward from the jetting part 9. The boundary between the jetting part 9 and the conical part 10 is the boundary between the holding hole 4 and the gas chamber 5. Conforms to boundaries. Such nozzle tip 3
The upper end of the nozzle tip 3 is located below the upper end surface of the holding hole 4 of the cylinder 2, and the lower end of the nozzle tip 3 is spaced apart from the rear end of the cylinder 2 within the gas chamber 5. Open it up and find nozzle tip 3.
The outer periphery of is inserted into the holding hole 4 of the cylindrical body 2 and held,
This gas burner is characterized in that the inner diameter of the lower end of the conical part 10 of the gas flow hole 8 is selected to be approximately equal to the inner diameter of the connecting cylinder part 7.

Embodiments of the present invention will be described below with reference to the drawings. The drawings are cross-sectional views of one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the section line - in FIG. 1. This gas burner 1 basically consists of a cylindrical body 2 and a nozzle tip 3 fitted therein, and is used, for example, for glass processing.

The cylindrical body 2 is made of metal, for example, brass, and a holding hole 4 and a gas chamber 5 having a larger diameter than the holding hole 4 are formed concentrically in order from the tip (upper end in FIG. 1) to the rear end. be done. A connecting cylinder part 7 having an external thread 6 protrudes from the rear end of the cylinder body 2, and a connecting pipe for supplying gas fuel such as city gas and air is screwed into this connecting cylinder part 7. Ru.

The nozzle tip 3 is made of a heat-resistant sintered metal, such as stainless steel, and is formed into a cylindrical shape. Gas flow holes 8 are formed concentrically in the nozzle tip 3, and the gas flow holes 8 are
From the top to the bottom of the figure, small-diameter spout parts 9
and a conical part 10 whose diameter increases downward from the spouting part 9. The outer periphery of the nozzle tip 3 is selected to such an extent that it can be inserted into and held in the holding hole 4 of the cylindrical body 2, and the nozzle tip 3 faces the gas chamber 5 halfway along its axial direction, and is placed in the holding hole 4. Retained. Therefore, an annular gap 11 is formed between the outer peripheral surface of the nozzle tip 3 and the inner peripheral surface of the gas chamber 5 of the cylindrical body 2 in a portion corresponding to the conical portion 10.

The connecting cylinder portion 7 projects below the cylinder body 2 . Further, as clearly shown in FIG. 1, the boundary between the ejection part 9 and the conical part 10 coincides with the boundary between the holding hole 4 and the gas chamber 5. The upper end of the nozzle tip 3 is located within the holding hole 4 of the cylinder 2 below the upper end surface thereof.
The lower end of the nozzle tip 3 is connected to the cylindrical body 2 in the gas chamber 5.
located above and spaced from the rear end of the The inner diameter of the lower end of the conical portion 10 of the gas flow hole 8 is selected to be approximately equal to the inner diameter of the connecting cylinder portion 7.

In the gas burner 1 configured in this way,
A portion of the gas fuel and air supplied to the gas chamber 5 flows through the gas flow hole 8 to form a main flame 12 at the center of the tip of the nozzle tip 3. On the other hand, the remaining fuel gas and air flow through the wall of the nozzle tip 3, as shown by the arrow 13, and are combusted at the tip surface 3a of the nozzle tip 3 to form a stable flame 14. Therefore, the main flame 12 is surrounded by the holding flame 14,
Good combustion can be achieved.

Note that the flow rates of the fuel gas and air that form the flame stabilization 14 are determined by (1) the density of the sintered metal constituting the nozzle tip 3, (2) the outer peripheral area of the nozzle tip 3 facing the gap 11, and (3) the area of the nozzle tip 3. It is determined by the area of the rear end surface 3b. Furthermore, the flow rates of the fuel gas and air that form the main flame 12 are determined by (4) the flow cross-sectional area of the ejection part 9. Therefore, each of the above conditions (1)
By changing (4), the sizes of the main flame 12 and the flame-holding flame 14 can be changed.

In this gas burner 1, it is also possible to use a mixed gas of fuel gas and oxygen in addition to a mixed gas of fuel gas and air.

The present gas burner 1 can be used not only for glass processing as described above, but also for a wide range of fields such as dental material processing and metal engraving.

As described above, according to the present invention, the following effects are achieved.

(a) Since the nozzle tip 3 is inserted into and held in the holding hole 4 of the cylinder 2, the structure is extremely simple.

(b) The boundary between the ejection part 9 and the conical part 10 of the nozzle tip 3 coincides with the boundary between the holding hole 4 and the gas chamber 5. That is, the small-diameter spout portion 9 is aligned with the position of the holding hole 4 . Therefore, even if the nozzle tip 3 is firmly fitted into the holding hole 4, the nozzle tip 3 will not be deformed, and the cylinder body 2 will not be deformed.
and the nozzle tip 3 can be firmly fixed to each other.

(c) The gas flow hole 8 of the nozzle tip 3 consists of a jetting part 9 having a small diameter from the top to the bottom, and a conical part 10 having a large diameter downward from the jetting part 9. The inner diameter of the lower end of this conical portion 10 is selected to be approximately equal to the inner diameter of the connecting cylinder portion 7. Therefore, the gas from the connecting cylinder part 7 is guided from the conical part 10 to the small-diameter ejection part 9. Therefore, the gas is ejected from the ejection portion 9 at a desired relatively high speed, and the gas is rectified.
It is therefore possible to achieve a sharp flame with the desired flame length.

(d) The lower end of the nozzle tip 3 is located above the rear end of the cylinder 2 within the gas chamber 5 at a distance. Further, there is a gap between the outer peripheral surface of the nozzle tip 3 and the inner peripheral surface of the gas chamber 5. Furthermore, a conical portion 10 is formed in the gas flow hole 8 . With these configurations, the gas from the connecting cylinder portion 7 reliably enters the nozzle tip 3 made of sintered metal, making it possible to form a stable flame 14 in a good combustion state.

(e) In this way, the present invention does not require the wire mesh etc. mentioned in connection with the prior art mentioned above, which also simplifies the construction and reduces the lifespan of the wire mesh due to high temperatures. The problem of having a short period of time and thus requiring replacement and complicated maintenance is solved by the present invention. Furthermore, the present invention does not require the prior art to provide multiple wire meshes for rectification, and therefore not only does maintenance become simpler as described above, but the present invention also reduces pressure loss. This makes it possible to obtain the optimal flame for the desired glass processing.

(f) As mentioned above, the boundary between the ejection part 9 and the conical part 10 of the nozzle tip 3 coincides with the boundary between the holding hole 4 and the gas chamber 5. Such a configuration serves to prevent a reduction in flashback caused by flame propagation to the mixed gas in the gas chamber 5 by making the ejection part 9 long to a certain extent. Further, after the mixed gas flow has been sufficiently rectified in the conical part 10, the thickness of the flame is determined in the ejection part 9. Therefore, if a stable flame is to be obtained, a combination of the jet section 9 and the conical section 10 is required.

(g) The outer diameter of the nozzle tip 3 is uniform in the vertical axial direction of FIG. 1, and the inner diameter of the gas chamber 5 is also uniform in the axial direction. Therefore, there is a gap between the outer circumferential surface of the nozzle tip 3 and the inner circumferential surface of the gas chamber 5. Let me explain the function of this gap. To obtain flames with different flame lengths using a single burner, there are two methods: changing the mixing ratio of gas fuel and air or oxygen, and changing the pressure or amount of the mixed gas while keeping the mixing ratio constant. There are two ways to do this, and in either method, the internal pressure of the burner changes. In the burner according to the invention,
Changes in burner internal pressure tend to occur more frequently in the main flame. Therefore, by providing a gap as described above, it is possible to maintain flame stability to an optimal size for the main flame. The space of the gas chamber 5 prevents the mixed gas from directly flowing into the ejection part 9. In other words, it has the role of a cushion, and the same mixed gas pressure is applied to the main flame and the holding flame. This is an important effect of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along the cutting plane line - in FIG. 1. 1... Gas burner, 2... Cylindrical body, 3... Nozzle chip, 4... Holding hole, 8... Gas distribution hole.

Claims (1)

[Claims for Utility Model Registration] A holding hole 4 that extends vertically, is formed in a cylindrical shape, and has an inner diameter that is uniform in the axial direction from the tip end to the rear end, and a holding hole 4 that has a diameter larger than the holding hole 4. A cylinder body 2 is formed concentrically with a gas chamber 5 having a uniform inner diameter in the axial direction, and a connecting cylinder part 7 having an inner diameter smaller than that of the holding hole 4 protrudes downward from the rear end. , a nozzle tip housed in a cylinder 2, made of heat-resistant sintered metal, and having a uniform outer diameter in the axial direction, with a gas flow hole 8 formed concentrically;
The gas distribution hole 8 is made up of, in order from above to below, a small-diameter ejection part 9 and a conical part 10 that becomes larger in diameter downward from the ejection part 9.
The boundary with 0 coincides with the boundary between the holding hole 4 and the gas chamber 5. The nozzle tip 3 includes such a nozzle tip 3, the upper end of the nozzle tip 3 is located below the upper end surface of the holding hole 4 of the cylinder 2, and the lower end of the nozzle chip 3 is located behind the cylinder 2 in the gas chamber 5. The outer periphery of the nozzle tip 3 is inserted and held in the holding hole 4 of the cylinder body 2, and the inner diameter of the lower end of the conical part 10 of the gas distribution hole 8 is the inner diameter of the connecting cylinder part 7. A gas burner characterized by being selected almost equally.