JPH06341646A - Gas stove - Google Patents

Abstract

PURPOSE:To provide a gas stove with a greater heating effect wherein it is capable of increasing a combustion load while preventing back fire from being produced and a combustion plate from being rendered to thermal deterioration and wherein it is capable of providing higher thermal ray radiation intencity. CONSTITUTION:In a gas stove 100 which includes a housing 1 having an opened heat ray radiation port 101, a reflection plate 21 laid along the substantially entire surface of the internal surface of the housing 1, a combustion plate 3 mounted on the central portion of the reflection plate 21 provided between the housing 1 and the reflection plate 21, a premixing chamber 2 provided on the back surface of the combustion plate 3 for supplying premixed air of fuel gas and combustion air, and premixed air supply means 4 to the premixing chamber 2, the premixing chamber 2 is provided along substantially the entire surface of the internal surface of the housing 1 and the reflection plate 21 is employed as a wall plate of one of the premixing chamber 2 and is formed with a good heat conduction metal plate, and further supply pressure of the premixed air by the premixed air supply means 4 is set to be higher.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas stove in which a predetermined position is heated spotwise by being hung at a high position or placed horizontally.

[0002]

2. Description of the Related Art A hanging gas stove is connected to a hanging means such as a chain, and is generally stretched over the entire lower surface along a lower surface of the housing and a roof-like housing having an open bottom. And a reflector. A combustion plate mounting hole is formed in the center of the reflection plate, and the combustion plate is installed so that the combustion surface (lower surface) is exposed. Further, a premix chamber for supplying a premixture of fuel gas and combustion air to the back surface (upper surface) of the combustion plate is provided in the space between the housing and the reflection plate. A supply port for fuel gas and combustion air is provided at the end of the premix chamber, and the premix gas flows from the supply port to the back surface of the combustion plate. In addition, this hanging gas stove is sideways,
Or it may be installed diagonally and used for spot heating in the lateral or diagonally lower direction.

Conventionally, in a hanging gas stove, it has been considered that when the temperature of the premixed gas becomes high, a backfire in which the flame passes through the combustion plate and enters the premixing chamber is likely to occur, and the premixing chamber is thermally insulated. There is no idea that it is installed on the floor and heated positively. Further, when the temperature of the combustion surface of the combustion plate exceeds 1000 ° C., a flashback is likely to occur and the durability of the combustion plate is reduced, so that the combustion load (combustion amount per unit area) cannot be increased so much. As a result,
The radiation intensity of the heat rays cannot be increased so much, and the heating effect is small.

[0004]

When the inventor heats the premixing chamber in the hanging gas stove to raise the temperature of the premixed gas to a high temperature, the combustion amount per unit area of the combustion plate (combustion load) It has been found that the temperature of the combustion surface of the combustion plate can be maintained at about 1000 ° C. even if the value of () is increased. An object of the present invention is to provide a gas stove that can increase the combustion load while preventing the occurrence of flashback and the thermal deterioration of the combustion plate, increase the radiation intensity of the heat rays, and have a large heating effect based on the above findings.

[0005]

A gas stove according to the present invention is mounted on a housing having an open heat ray radiating port, a reflector extending along substantially the entire inner surface of the housing, and a central portion of the reflector. And a premixing chamber that is provided between the housing and the reflection plate and supplies a premixed mixture of fuel gas and combustion air to the back surface of the combustion plate, and to the premixing chamber. In the gas stove provided with the premixed gas supply means, the premixing chamber is provided along substantially the entire inner surface of the housing, and the reflecting plate is one wall plate of the premixing chamber and has good thermal conductivity. It is formed by a metal plate, and the supply pressure of the premixed gas by the premixed gas supply means is set high. Claim 2
In the above, a partition for separating the premix chamber and the combustion plate is provided, and the premix air supply means adjusts the supply amount of the premix air for each partition.

[0006]

According to the present invention, since the bottom wall of the premixing chamber is made of a metal having good thermal conductivity and is formed on the entire surface of the housing, the premixing chamber is heated most efficiently by the heat rays generated by the combustion plate. it can. As a result, the premixed gas in the premixing chamber is heated to have a low density and the internal pressure in the premixing chamber becomes high, so that the supply pressure of the premixed gas by the premixing gas supply means to the premixing chamber is set high. As a result, as evidenced by the measurement data shown in FIG. 4, the surface temperature of the combustion plate can be maintained at about 1000 ° C. even if the combustion load is increased. As a result, the combustion load on the combustion plate can be increased to about twice that of the conventional product, and the radiation intensity of heat rays can be increased, so that the spot heating effect is high. With the configuration according to the second aspect, it is possible to switch the heating capacity and adjust the combustion load, so that comfort can be improved.

[0007]

1 and 2 show a hanging gas stove 100 according to a first embodiment of the present invention. This hanging gas stove 100 has a substantially M-shaped cross section that expands downward at an angle of 30 degrees, and has a roof-shaped housing 1 whose lower end is a radiation port 101 that opens downward. Each of the housings 1 has a roof shape and is filled with a metal outer plate 11 and an inner plate 12 in which both edges 1A and 1B are connected and integrated, and between the outer plate 11 and the inner plate 12. And a heat resistant heat insulating material 13.
A premix chamber 2 for fuel gas and combustion air is provided on the lower (inner) surface of the housing 1 along substantially the entire surface.

The premix chamber 2 comprises an inner plate 12 of the housing.
And has a roof shape and is separated from the inner surface of the inner plate 12 by a gap 20 serving as the premix chamber 2, and both edges are both edges 1 of the housing 1.
It is formed by a bottom wall 21 connected to A and 1B in an airtight state, and side wall plates 22 and 23 that seal both sides of the gap 20 in an airtight state. The bottom wall 21 is a reflection plate whose lower surface is a reflection surface 24 for heat rays, and a rectangular hole 25 for mounting a combustion plate is formed at the center of the bottom wall 21. In this embodiment, a laminated plate (clad plate) of an aluminum layer 2A and a stainless layer 2B is used for the bottom wall 21, and the heat applied to the surface of the reflecting surface 24 is an aluminum layer having excellent thermal conductivity. 2A smoothly transmits the premixed air in the premixing chamber 2.

In the rectangular hole 25, a combustion plate 3 which is a rectangular heat-resistant ceramic plate 31 having a large number of small flame openings 32 formed in a lattice shape is fitted to form a planar crater. The lower surface of the combustion plate 3 is a combustion surface 33, and a protective wire mesh cover 34 is installed below the combustion surface 33. As shown in FIG. 1, a cylindrical body 41 forming an intake port for combustion air is inserted into both side lower end portions 221 and 222 of one side wall plate 22 which is in contact with the periphery of the premix chamber 2, and the cylindrical body 4 is inserted.
At the center of 1, a fuel gas injection nozzle 42 is coaxially mounted, and fuel gas and combustion air supply ports (premixed gas supply means) 4 and 4 are formed. Fuel gas is supplied to the injection nozzle 42 from the gas supply pipe 40 via a main valve 43, a safety valve 44, and a gas governor 45. Brackets 26 and 27 are provided at the center of the upper portions of the outer walls of the side wall plates 22 and 23, and hanging chains 28 and 29 are connected to the brackets 26 and 27, respectively.

In the hanging gas stove 100, the fuel gas and the combustion air supplied from the supply ports 4 and 4 which are the premixed gas supply means are premixed while being premixed.
It flows inside and reaches the upper surface (rear surface) of the combustion plate 3 and blows downward from the small flame port 32 and burns in the vicinity of the combustion surface 33. Most of the heat rays generated by the combustion in the combustion plate 3 are the reflection surface 24.
And is radiated downward. Part of the heat is absorbed by the bottom wall 21 of the premixing chamber 2 and the bottom wall 21 becomes high in temperature to heat the premixed gas in the gap 20. In the present invention, the bottom wall 21 is a laminated plate of the aluminum layer 2A and the stainless layer 2B having excellent heat conductivity, and the premixing chamber 2 is provided along substantially the entire surface of the housing 1 and has a large heat receiving area. Therefore, the heating of the premixed gas is performed most efficiently.

Since the premixed gas in the premixing chamber 2 is in direct contact with the bottom wall 21, it is heated (preheated) to a high temperature and expanded (density is reduced), and the internal pressure in the premixing chamber 2 is high. Become. Therefore, in order to supply the premixed air into the premixing chamber 2, the pressure of the fuel gas blown out from the injection nozzle 42 and the combustion air sucked into the jet flow of the fuel gas by the ejector effect are both high pressure. There is a need to. In this invention, the supply port 4
In order to set a high supply pressure of the premixed gas due to, the gas pressure mainly injected from the injection nozzle 42 is maintained at a high level as shown in FIG. It blows out at a high speed from the small flame port 32 of the combustion plate. The preheated premixed gas has a high combustion speed, and flame lift is unlikely to occur even if it is blown out at a high speed. Therefore, the combustion load can be increased, and the radiant intensity of the heat rays can be increased due to the increase in the calorific value. This increase in radiation intensity improves the spot heating effect.

FIG. 3 shows a second embodiment. In this embodiment, a partition wall 5 is formed in the middle of the premixing chamber 2, and premixed gas supply means 4A, 4B for supplying the premixed gas to the partitions 20A, 20B of the premixing chamber partitioned by the partition wall 5. Gas governors or governor-equipped proportional valves 45A and 45B having a function of adjusting the supply amount of the fuel gas are attached to the gas pipes 40A and 40B connected to each of the above. With this configuration, the gas is burned in only one or both of the compartments 20A and 20B, the heating capacity is switched stepwise by adjusting the combustion amount, and a gas governor or a proportional valve with a governor is used to control a temperature not shown. The sensor can continuously and widely control the heating load according to the heating load, and can adjust the spot heating position. The partition walls 5 may be formed so as to be biased to one side of the premix chamber 25, or a plurality of partition walls 5 may be provided. In this case, the supply port (premixed gas supply means) 4
Of course, it is necessary for each division.

In the present invention, the housing, the reflecting surface,
The shape of the combustion plate may be any desired shape such as a circle, an ellipse or a polygon. Further, in the embodiment shown in FIG. 1, the heat insulating material 13 is arranged in the housing 1 to improve the preheating efficiency of the premixed air. However, the heat insulating material is also attached to the inner surface of the inner plate 12 so that the preheating efficiency is improved. May be further improved. Also, the bottom wall 2
If 1 is a metal having a high reflectivity of heat rays, it may be a plate or a clad plate made of another metal having good heat conductivity such as copper. Further, in the first embodiment shown in FIG. 1, only one of the cylinder 41 and the fuel gas injection nozzle 42 may be provided.

FIG. 4 shows a hanging gas stove 100 of the present invention shown in FIG. 1 and a conventional hanging gas stove 200.
6 is a graph showing the measurement data of the relationship between the combustion load (input amount), the gas pressure injected from the injection nozzle 42, and the combustion surface temperature in FIG. The hanging gas stove 100 of the present invention can maintain the temperature rise of the combustion surface at about 1000 ° C. even in high load (high input) combustion, and the radiant intensity at the time of high input is about 2 times that of the conventional hanging gas stove 200. It has been proven that it can be doubled.

[Brief description of drawings]

FIG. 1 is a perspective view of a hanging gas stove of the present invention.

FIG. 2 is an enlarged perspective view of a main part of FIG.

FIG. 3 is a perspective view of a hanging gas stove according to another embodiment.

FIG. 4 is a graph showing the combustion surface temperature of the hanging gas stove of the present invention.

[Explanation of symbols]

100 Suspended gas stove 1 Housing 2 Premixing chamber 3 Combustion plate 4 Fuel gas and combustion air supply port (premixed gas supply means) 5 Partition wall 21 Bottom wall (reflection plate)

Claims (2)

[Claims] 1. A housing having an open heat ray radiating port, a reflector extending along substantially the entire inner surface of the housing, a combustion plate attached to the center of the reflector, the housing and the reflector. A gas provided between the plate and a premixing chamber for supplying a premixed mixture of fuel gas and combustion air to the back surface of the combustion plate, and a premixed gas supply means for supplying the premixed chamber to the gas. In the stove, the premix chamber is provided along substantially the entire inner surface of the housing, the reflecting plate is one of the wall plates of the premix chamber, and is formed of a good heat conductive metal plate. A gas stove characterized in that the supply pressure of the premixed gas by means is set high. 2. The partition wall for partitioning the premixing chamber and the combustion plate according to claim 1, wherein the premixed gas supply means adjusts the supply amount of the premixed gas for each partition. And gas stove.