JPH0221702Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a radiation-enhanced heating stove, and more specifically, it promotes the generation of radiant heat during the combustion of various fuels, thereby promoting convective heat transfer and the aforementioned accelerated heating stove. This invention relates to a "stove" that can significantly increase thermal efficiency for heated objects through a synergistic effect with radiant heat transfer.

Problems to be solved by conventional technology and ideas In heating devices for heated objects, such as gas stoves,
Generally, high-temperature combustion gas ignited in a burner comes into contact with the bottom surface of an object to be heated (for example, a pot), and the object to be heated is mainly heated by convective heat transfer of the combustion gas. However, the combustion gas only comes into contact with the bottom of the heated object for a short time, and has a relatively high temperature (approximately 350℃).
It escapes upward while retaining its thermal energy. For this reason, the heat utilization efficiency of conventional gas stoves is
It was extremely low. In addition, as a result of the high temperature combustion gas that can be effectively used as heat flowing upward, there are also drawbacks such as an increase in the environmental temperature around the gas stove.

Purpose of the invention In view of the above-mentioned problems inherent in the conventional heating stove for heated objects, the present invention
This was devised to solve this problem in a suitable manner, and the fuel supplied to the combustion zone of the stove is combusted in the presence of sufficient oxygen by supplying preheated air to increase combustion efficiency and to achieve high temperature. The combustion gas is passed through a radiant plate made of an air-permeable solid known as a solid-state heat transfer conversion element to convert the sensible heat of the combustion gas into solid-state radiant heat, resulting in a synergistic effect between the convective heat transfer and the promoted radiant heat transfer. The purpose is to improve the thermal efficiency of the heating device and to suppress the temperature rise in the surrounding environment as much as possible.

Means for Solving the Problems In order to overcome the above problems and achieve the intended purpose, the radiation-enhanced heating stove according to the present invention has a cylindrical drop formed approximately in the center of the stove body. The combustion tube is inserted into the cylinder to stand upright, and the board made of breathable solid material is curved into a dish shape.
a radiant plate disposed horizontally inside the combustion tube and having a concave surface facing upward; and a radiant plate located inside the combustion tube and below the radiation plate and extending in a curved manner into a desired shape. a fuel supply pipe and an air supply pipe separated into; an air supply nozzle arranged annularly inside the combustion cylinder and above the radiation plate and communicating with the air supply pipe; an air supply nozzle inside the combustion cylinder and above the radiation plate; a combustion burner disposed concentrically right above the air supply nozzle and connected to the fuel supply pipe; and a combustion burner placed on the top of the combustion tube and arranged inside the combustion tube to connect the radiant plate and the combustion burner. It is comprised of a heat-resistant heat transmitting plate that covers the combustion heating zone defined between the burners from above and on which the object to be heated is placed; The present invention is characterized in that the fluid is configured to perform heat exchange with the combustion gas in the combustion burner and to supply the fluid in a preheated state to the combustion burner and the air supply nozzle, respectively.

In the present invention, a so-called "breathable solid" is used as the material of the radiant plate, so an outline of this breathable solid will be explained in advance. Here, the term "breathable solid" refers to a solid having an appropriate thickness that is made of a heat-resistant material such as metal or ceramics and formed into a net shape, honeycomb shape, fiber shape, porous shape, etc. to give it breathability. This air-permeable solid is considered to be composed of a large number of fine wires or fine grains, and its substantial surface area is extremely large. Since the radiation emission ability of a solid is sufficiently higher than that of a gas, when the combustion gas is passed through the air-permeable solid, the sensible heat of the combustion gas comes into contact with the solid, which has an extremely large surface area, resulting in highly efficient heat exchange. is carried out, generating a large amount of solid-state radiant heat. A solid heat transfer element having such characteristics is referred to as a "breathable solid". This breathable solid is
It has the characteristic that even if heat is removed by heat exchange downstream of the combustion gas, it has almost no effect on the upstream side.

The radiant heat emission state of the breathable solid S will be explained with reference to the schematic diagram shown in FIG. Breathable solid S
has a thickness X in the flow direction of the combustion gas G, so when the combustion gas G passes through the solid S, convective heat transfer takes place within that layer, producing a temperature gradient shown by a curve C. _{In each layer x 1 ...}
However, within this solid radiant heat, y ₄ , y ₅ and
z ₁ and z ₂ are shielded and attenuated according to the thickness of the breathable solid S in the front-rear direction, and as a result, most of the radiant heat R is emitted to the upstream side Y of the combustion gas G.

Embodiments Next, preferred embodiments of the radiation-enhanced heating stove according to the present invention will be described below with reference to the accompanying drawings. FIG. 2 shows a partially cutaway longitudinal section of the radiation-enhanced heating stove according to the present invention. In this embodiment, a gas stove is assumed, but the stove is not limited to this. An oil stove or the like that burns the oil with a burner can also be suitably used.

In the accompanying drawings, reference numeral 10 indicates a stove body, and a large diameter cylindrical droplet 12 is formed approximately in the center of the stove body 10. Further, a combustion tube 14 made of a thick heat-resistant metal is inserted concentrically into the droplet 12 and is seated upright on the bottom 16 thereof. A large number of slit-shaped exhaust holes 18 are bored on the outer periphery of the lower part of the combustion tube 14, and the outer diameter of the combustion tube 14 is set to be sufficiently smaller than the inner diameter of the cylindrical droplet 12. An annular gap 20 of a predetermined size shown in FIG. 2 is formed between the combustion tube 14 (this annular gap 20 functions as an escape path for exhaust gas as described later). The inner central portion of the cylinder 14 serves as a combustion heating zone for the supplied fuel gas as will be described later, and an inverted flange-shaped annular member 2 is provided on the outer periphery of the top of the combustion cylinder 14.
4 is attached.

In the combustion heating zone (indicated by reference symbol CZ) of the combustion tube 14, a radiant plate 26 made of the air permeable solid curved into a dish shape is arranged and fixed with its concave surface facing upward. There is. Various means can be used as appropriate for this fixing method, but in this embodiment, as shown in FIG. 2, it is placed on a spiral air supply pipe (described later).
As a specific example of the "breathable solid" constituting the radiant plate 26, four sheets of 16-mesh stainless wire mesh with a wire diameter of 0.6 mm were laminated and polymerized, and this was used by forming it into a curved dish shape. Good results were obtained.

A fuel supply burner is arranged above the radiation plate 26. In the case of this embodiment, this fuel supply burner has a composite structure of the air supply pipe 28 and the fuel supply pipe 44, but it may be a single fuel supply pipe or a single fuel/air mixture supply pipe as necessary. . In this embodiment, the air supply pipe 28 made of a heat-resistant metal has one end connected to the air inlet 30 of the gas stove 10, and a main body extending horizontally into the combustion tube 14. After that, it rises vertically for some distance at the center of the bottom of the combustion tube 14, and below the radiant plate 26, as shown in FIG.
It is spirally wound radially outward from the center. The air supply pipe 28 is connected to the combustion tube 14.
At the final winding portion closest to the inner wall of the radiator, it rises vertically again as shown by reference numeral 32, and is led out above the radiator plate through the notch 34 of the radiator plate 26, where the annular air supply nozzle 36. This air supply nozzle 36 has an appropriate number of slit-shaped air supply holes 38 bored in its inner peripheral portion, so that air is forcibly supplied from an air blowing source (not shown).

Further, above the air supply nozzle 36, a combustion burner 40 formed in an annular shape having the same diameter is concentrically arranged, and this combustion burner 40 has a large number of fuel blowing holes 42 bored in its inner circumference. , one end thereof is connected to a fuel supply pipe 44. in this case,
As shown in FIG. 2, the fuel supply pipe 44 is arranged in a spiral manner below the radiant plate 26, and is configured to preheat the fuel fed through the pipe. That is, the fuel supply pipe 44 is connected to the hose connection port 46 of the stove 10, and after the main body faces horizontally inside the combustion tube 14, it is radially outwardly located below the spiral part of the air supply pipe 28. It is wound in a spiral from the front to the center.
Next, as shown by reference numeral 48 in FIG. 2, the fuel supply pipe 44 is vertically raised, and then the radiant plate
6, where the combustion burner 4
Connected to 0.

With this configuration, the combustion heating zone CZ is provided between the radiation plate 26 and the fuel supply burner to promote radiation of the combustion gas to the upstream side when the combustion gas of the burner passes through the radiation plate. is formed. As shown in FIG. 2, this combustion heating zone CZ is covered and closed with a heat transmitting plate 50 made of a heat-resistant material such as quartz glass or mica. This prevents the high temperature combustion gas in the zone CZ from wastefully escaping from above the zone to the outside, and all of it passes through the radiant plate 26 and is effectively heat exchanged. In this case, a circular trivet or roaster 52 that supports the weight of the object to be heated such as the pot 22
It is preferable to provide this in order to protect the heat transmitting plate 50.

The piping system connected to the fuel supply burner and arranged close to the combustion gas downstream side of the radiation plate 26 (that is, the opposite side of the combustion heating zone CZ) has a spirally wound shape as described above. In addition to doing
It is also possible to use another shape that provides a sufficiently large contact area with the combustion gas, such as a square-wound shape or a meandering shape.

Effects of the Embodiment Next, the actual use of the radiation-enhanced heating stove according to the embodiment described above will be explained. The pot 22 as an object to be heated is placed on the roaster 52 disposed at the top of the combustion tube 14, and the fuel supply burner is ignited. That is, in this embodiment of the closed type, when air is forcibly supplied from the air supply nozzle 36 and fuel gas is blown out from the combustion burner 40 and ignited, high-temperature combustion gas is obtained in the combustion zone CZ. This combustion gas suitably heats the pot 22 through the heat transmission plate 50 mainly by radiant heat transfer, and after passing downward through the radiant plate 26 made of a breathable solid, the combustion gas is formed at the lower part of the combustion tube 14. It escapes as exhaust gas through the exhaust hole 18.

When the combustion gas passes through the radiant plate 26, the sensible heat of the combustion gas comes into contact with a solid having an extremely large surface area, resulting in highly efficient heat exchange, and the radiant plate 26 Emits a large amount of radiant heat. Moreover, as explained in the schematic diagram of FIG. 1, most of the large amount of radiant heat emitted by the radiant plate 26 is emitted to the upstream side of the combustion gas (that is, the combustion zone CZ side in the case of the present invention). Therefore, the pot 22 is additionally heated by this radiant heat transfer, achieving extremely high thermal efficiency.

Furthermore, the combustion gas that has passed through the radiation plate 26 is deprived of sensible heat, resulting in a temperature drop of about 50 to 100 degrees Celsius, and becomes comparatively low-temperature (approximately 250 degrees Celsius) exhaust gas. 20 to the outside. Therefore, even by using this gas stove, the temperature rise in the surrounding environment can be effectively suppressed. In this case, even if a large diameter pot 22 is used,
In order to prevent the bottom from blocking the annular gap 20, the level of the top surface 54 of the stove body 10 is set to be lower than the bottom surface level of the pot 22, as shown in FIG. is preferred.
Further, due to this, the combustion gas dissipated from the annular gap rises and comes into contact with the pot 22 again to heat it, thereby achieving effective heat utilization.

In the case of the illustrated embodiment, the combustion waste gas escapes upward from the annular gap 20 and is dissipated into the room.
If the annular gap 20 is sealed, an outdoor exhaust pipe (not shown) is connected to the annular gap 20, and the combustion waste gas is forcibly discharged outdoors by an exhaust fan,
The indoor air is completely uncontaminated and is extremely suitable. Furthermore, when the combustion waste gas is swept by a fan in this manner, there is no need to connect the above-mentioned blowing source to the air supply pipe 28 side.

Note that, as described above, although the combustion gas after passing through the radiant plate 26 is accompanied by a temperature drop, it still has considerable thermal energy. Furthermore, since radiant heat is emitted below the radiant plate 26, which is the downstream side of the combustion gas, even if the amount is not large (see Fig. 1), the radiant heat is spirally wound below the radiant plate 26. The environment around the arranged air supply pipe 28 becomes quite high temperature. Therefore, the air fed through the air supply pipe 28 is sufficiently preheated and supplied to the combustion zone CZ, which can contribute to improving combustion efficiency. Similarly, when the fuel supply pipe 44 is arranged in a winding manner below the radiant plate 26, the fuel is preheated and the combustion efficiency is improved (this effect is particularly noticeable when the fuel is a liquid type).

Effects of the Invention As explained above, according to the radiation-enhanced heating stove according to the present invention, the combustion gas from the combustion burner passes through the heat transmission plate with excellent heat permeability, and is transferred to the heat transmission plate. The placed object to be heated, such as a pot, is heated mainly by radiant heat transfer. Furthermore, the high-temperature combustion gas passes through a radiant plate made of a breathable solid, and the sensible heat is converted into a large amount of solid radiant heat in the radiant plate. As explained with reference to the schematic diagram in Fig. 1, most of this solid radiant heat is injected to the combustion heating zone side, which is the upstream side of the combustion gas, so the object to be heated is injected to the combustion heating zone side. Further heating is achieved by the transfer of solid-state radiant heat.

In addition, the combustion heating zone defined inside the combustion tube and between the radiant plate and the combustion burner is covered from above with a heat-resistant heat transmitting plate, so that high-temperature combustion gas is It is confined within the zone and is prevented from escaping to the outside. Therefore, most of the high-temperature combustion gas comes into contact with the radiant plate made of a breathable solid, converting sensible heat into a large amount of solid radiant heat, and effectively utilizing energy.

Furthermore, since the air and fuel supplied to the combustion zone are preheated by heat exchange with the combustion gas that has passed through the radiant plate, combustion efficiency is improved. In addition, since the exhaust gas after combustion has sensible heat taken away and has a relatively low temperature, it has many beneficial effects, such as being able to appropriately suppress a rise in the temperature of the surrounding environment.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the radiant heat emission state of a breathable solid, Fig. 2 is a partially cutaway longitudinal cross-sectional view of the radiation-enhanced heating stove according to the present invention, Fig. 3 is a cross-sectional view taken along the - line in Fig. 2, Figure 4 is a sectional view taken along the - line in Figure 2;
The figure is a partially cutaway perspective view of the device shown in FIG. 2, and FIG. 6 is a partially cutaway vertical sectional view of another embodiment of the present invention. 26...Radiation plate, 28...Air supply pipe, 36...
... Air supply nozzle, 40 ... Combustion burner, 44
...Fuel supply pipe, 50...Heat transmission plate.

Claims (1)

[Claims for Utility Model Registration] A combustion tube 1 that stands upright and is concentrically inserted into a cylindrical drop 12 formed approximately at the center of the stove body 10.
4. A board made of breathable solid is curved into a dish shape.
A radiant plate 26 is arranged horizontally inside the combustion tube 14 and has a concave surface facing upward; Extending, mutually separated fuel supply pipe 44 and air supply pipe 2
8, an air supply nozzle 36 disposed annularly inside the combustion tube 14 and above the radiation plate 26 and communicating with the air supply pipe 28; and an air supply nozzle 36 inside the combustion tube 14 and above the radiation plate 26; A combustion burner 40 is disposed concentrically right above the combustion tube 36 and is connected to the fuel supply pipe 44; It consists of a heat-resistant heat transmitting plate 50 that covers the combustion heating zone CZ defined between the combustion burners 40 from above and on which the object to be heated is placed, and the fuel supply pipe 44 and The fluid in the air supply pipe 28 and the combustion gas in the combustion burner 40 exchange heat, and the fluid is supplied in a preheated state to the combustion burner 40 and the air supply nozzle 36, respectively. A radiation-enhanced heating stove featuring the following.