JPS63101606A - Surface combustion burner head - Google Patents

Abstract

PURPOSE:To enable ball-like substances to be held while a certain degree of free movement is applied to the substances by a method wherein an upper half portion of each of the ball-like substances is held by a net-like member of which net size is smaller than an outer diameter of each of the ball-like substances, each of the ball-like substances is prevented from being dropped by lower layers of the ball-like substances and then a burner head having a desired shape is formed. CONSTITUTION:Ball-like substances 2 made of heat-resistant material are arranged in upper and lower three layers. The upper layer is held by a net-like member 3 made of stainless steel and the like. In case that an outer diameter of each of the ball-like substances 2 is phi3-phi5mm or so, a mesh size is set to be 4.5-5.5 mesh, thereby only the upper half part of each of the ball-like substances is projected out of the meshes. The lower portions of the ball-like substances 2 are held by applying a holding member 4 such as a punched plate and a metallic net and the like. When mixed gas is supplied to the lower portions of the ball-like substances, the mixed gas passes through clearances between the ball-like substances and then ignited. With this arrangement, the net-like member may not be damaged even if it is used for a long period of time, and the ball-like substance in the upper-most layer may be moved freely under a circumstance where a heating operation and a cooling operation are repeated and so cracks or breakage may be prevented from being generated in the ball-like substance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] This invention relates to an improvement in a burner head for a surface combustion burner.

[Prior Art] Conventionally, as a burner head for surface combustion, one in which a spherical material is molded into a certain shape using a suitable adhesive is generally used. However, since this type of burner head is a rigid monolithic structure, cracks almost always occur at the bonded portions of the surface layer on the combustion surface side due to repeated heating and cooling. If this happens, the spherical material will peel off and
The burner may fall off, impairing combustibility, or in severe cases, cracks may spread over the entire burner head, damaging it, making it impossible to maintain the initial performance.

[Objective and Summary of the Invention] In order to solve the above-mentioned problems, the present invention is to maintain a spherical material disposed at least in the uppermost layer of a burner head in a state in which it is given a necessary degree of freedom. It is made of a large number of spherical substances made of heat-resistant material for surface combustion.The upper half of each spherical substance is held, and each spherical substance in the top layer is held by the lower layer. The burner head is characterized by preventing the burner head from falling off and forming a burner head with a desired shape.

[Embodiments of the Invention] Preferred embodiments of the present invention will be described below with reference to the drawings. In this example, the substances are arranged in three layers, upper and lower,
All of them are provided with point contact to provide the desired thickness and profile.

-For example, the outer diameter of these spherical substances is φ3~φ5s1
It is ~φ5# to set the thickness within a range of about
l! In the case of a mesh size of 4.5 to 5.5 meshes, only the upper half of the spherical material can protrude from the mesh as shown in FIG. However, when three layers of spherical substances are arranged as described above, the lower surface of the spherical substance (2) a in the uppermost layer is supported by the upper surface of the spherical substance (2) b in the middle layer, and this is roughly Since the spherical substance (2) C in the lower layer supports it, if a shape-retaining member such as a punching plate or a wire mesh is applied to the lower side of the spherical substance (2), the spherical substance (2) The entire shape can be retained according to the shape of the shape retaining member. In this state, all the spherical substances are held by the net member (3) at the top layer and the shape retaining member (4) at the bottom layer, and the overall shape of the burner head can be arbitrarily defined.

In the figure, (9 is the burner head, (6) is the seal member for applying to the burner head (1) at the upper end of the burner duct, ■ is the burner holder, (8) is its set screw, (9) The overall shape of the burner head (1) thus obtained is cup-shaped in FIGS. 1 and 2, but the net-like member (3)
Of course, if the shape retaining member (4) is formed into a flat plate shape, the burner head combustion surface can be set flat.

In this invention, the net-like member (3) and the shape-retaining member (4)
It is preferable that all of the spherical substances to be placed between the two be filled freely so as to give a suitable degree of freedom, but it is not necessary to do so. For example, if the positional relationship between the spherical material (2) a and the net-like member (3) in the uppermost layer, which constitute the main part of the present invention, is maintained so as not to fall off or deviate, other lower layers Each of the spherical substances forming the can be adhesively fixed using a suitable adhesive.

The spherical substances that have been bonded and fixed to each other in this way can be used to perform the function of a so-called flame arrester. It may be used instead of layering.

FIG. 3 is an enlarged view of the main parts of the structure of the present invention, and the figure shows the mesh member (3) and the spherical material in the uppermost layer.
2) Shows the mutual positional relationship with a.

As is clear from this, when the diameter of the spherical material is d, it is desirable that the position of the net member relative to the spherical material be such that 1/2d>h+t. Here, h represents the height of the protrusion of the spherical material from the net-like member, and t represents the wire diameter of the net-like member. In the figure, when a mixed gas (fuel gas + combustion air) is supplied from the upstream side of the spherical materials as indicated by arrow (11), this mixed gas passes through the gaps between the spherical materials,
The spherical substances in the uppermost layer flow out and burn, and they gather to form a flame of a size corresponding to the effective diameter of the burner head.

In this case, the mixture that has exited the spherical material in the top layer is located upstream (retreating) from the combustion surface in the positional relationship described above, so it is not affected by the adverse effects of heat from the flame. I never receive it. Experimentally, as shown in FIG. 4, the thermal influence on the net-like member at this time is significantly reduced as it retreats from the combustion surface, that is, from the top surface of the spherical material in the uppermost layer, toward the upstream side. 2~ from the top surface of the spherical substance in the top layer
At the position 3 all retracted, it is only exposed to a temperature of about 200°C. Furthermore, on the upstream side, there is no effect of radiant heat from the flame, so the temperature further drops.

For this reason, the net-like member holding down the spherical material in the top layer will not be damaged even after long-term use, and the spherical material in the top layer itself will not be damaged even in environments where heating and cooling are repeated. It can move freely and avoid cracks and damage.

[Effects of the Invention] Since the present invention provides a burner head having the above-described structure, the following advantages can be obtained in use.

By keeping the spherical material in the top layer free, it is not only possible to move freely even after repeated heating and cooling, thereby avoiding cracks or damage to the core, but also to prevent the spherical material itself from forming a net-like member. Since it is held by a shape-retaining member and does not cause peeling or falling, durability can be significantly improved compared to conventional burner heads. Furthermore, regarding the durability of the net-like member, by maintaining the above-described positional relationship, it is possible to use it for a long period of time without being heated to high temperatures.

Furthermore, the net-like member has the effect of stirring the mixed gas flowing out from the spherical material interlayer, and can improve combustibility and flame stability. In addition, various burner head shapes can be provided by freely selecting the shape of the mesh member and shape-retaining member, reducing production costs and eliminating the need to use expensive heat-resistant adhesives. Economic benefits such as

In addition, in the burner head of the present invention, the freedom of movement of the spherical material makes it difficult for dirt to accumulate, and even if a clog occurs, it is easy to pressure wash and clean, making it easy to maintain. .

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing one embodiment of the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is a schematic side view showing the main parts of the invention, and Fig. 4 is the top layer. This is a graph showing the temperature gradient before and after a spherical material. (1) Burner head (2) Spherical material (3) Net member (4) Shape retaining member Patent applicant Miura Kogyo Co., Ltd. Figure 1 Figure 2 Figure 4

Claims (4)

[Claims] (1) In the structure of the surface combustion burner head (1) formed of a large number of spherical substances (2) made of a heat-resistant material, the mesh size is made somewhat smaller than the outer diameter of the spherical substances. The net-like member (3) holds the upper half of each spherical substance arranged in the top layer, and the lower layers prevent each spherical substance in the top layer from falling off, forming the desired shape. A burner head for surface combustion characterized by forming a burner head. (2) A shape retaining member (4) such as a punching plate is provided below the spherical substance in the lowest layer, and the spherical substance is filled between this shape retaining member and the net member disposed in the top layer. A burner head for surface combustion according to claim 1, wherein a burner head having a desired shape is formed by doing so. (3) A burner head for surface combustion according to claim 1, characterized in that the entire burner head shape is formed by adhesively fixing the spherical substances other than the top layer with a suitable adhesive. . (4) The spherical material is arranged in three layers, the upper surface of the spherical material in the middle layer supports the lower surface of the spherical material in the uppermost layer, and the shape-retaining member is used to support the spherical material in the middle layer and the lower layer. A burner head for surface combustion according to claim 1, characterized in that a spherical material is supported entirely.