JPH0438162Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a gas cooking stove.

(Prior Art) Conventionally, gas cooking stoves heat containers such as pots from the bottom using high-temperature fire from the mouth of a burner.

(Problem to be solved by the invention) However, in the conventional gas cooking stove, the effective utilization rate of chemical sensible heat from gas combustion is low, and combustion exhaust gas is dissipated into the room, so there is a risk of gas poisoning. Moreover, there is a problem in that there is a risk of explosion in the case of incomplete combustion.

The present invention aims to provide a gas cooking stove with good thermal efficiency and no risk of gas poisoning or explosion.

(Means for Solving the Problems) In order to achieve the above object, the cooking gas stove of the present invention is provided with a ring-shaped burner on the outside of the burner provided on the side wall, and an exhaust gas port on the center bottom. a combustion chamber made of a fire-resistant material; one end connected to the exhaust gas port and an exhaust gas passage extending outdoors; and one end connected to a gas header surrounding the combustion chamber and having the burner therein;
An air pipe line is provided concentrically around the exhaust gas passage so that the other end is connected to a discharge pipe having a fan that is driven in conjunction with the burner, and the air is passed through an eductor branching from the discharge pipe. and an exhaust gas suction means having a nozzle facing the exhaust gas passage.

(Function) In the gas cooking stove configured as described above, since the burner is provided outside the nozzle provided on the side wall of the combustion chamber, the side wall of the combustion chamber is heated by the flame. Here, heat is transferred to the container through heat transfer exchange with solid radiation. Further, the exhaust gas is forcibly discharged outdoors from the exhaust gas passage by the eductor, while the combustion air is preheated by the exhaust gas in the exhaust gas passage and is supplied from the gas header into the combustion chamber.

(Example) Next, the present invention will be explained with reference to drawings which are examples.

FIG. 1 shows a first embodiment, in which 1 is a stove body made of a fire-resistant material such as ceramics, which surrounds a bottomed combustion chamber 2 with an open upper part in the center and a side wall 3 of this combustion chamber 2. It consists of a gas header 7 provided so as to In the lower part of the side wall 3, there are provided a plurality of vents 4 which are spread out at approximately equal intervals, and in the bottom part 5, an exhaust gas port 6 is provided. 8, and one end communicates with an exhaust gas passage 9 leading to outdoors B.

Note that 10 is a chimney connected to the exhaust gas passage 9.

Further, an air passage 11 having one end reaching the opening 8 is arranged around the exhaust gas passage 9, and a discharge pipe 13 of a fan 12 is connected to this air passage 11, and a branch of this discharge pipe 13 is connected. A pipe 13a is connected to an eductor 14 projecting into the chimney 10.

Reference numeral 16 denotes a ring-shaped burner, which is disposed within the gas head 7 and outside the crater section 4, and includes a gas ring 17 and a gas line 19 having a gas outlet (not shown) corresponding to the crater section 4. It consists of a cock 18 connected to the. And Kotoku 1
8 is opened, the fan 12 rotates accordingly.

In addition, 20 is a radiation medium, 21 is a pedestal, and A is indoors.

In the above configuration, when the cock 18 is opened, the fan 12 rotates according to the degree of opening of the cock 18, and the fuel gas flows from the gas outlet of the gas ring 17 into the combustion chamber 2.
Combustion air is sucked in from around the crater portion 4 and ejected while being mixed.

Therefore, when ignited at the nozzle 4, the flame heats the side wall 3 of the combustion chamber 2, and the solid radiant heat heats the radiant medium 20 above, thereby heating the container C. Note that the radiant medium 20 may be omitted and the container C may be placed directly on the combustion chamber 2.

On the other hand, the eductor 1 is driven by the fan 12.
Air is ejected from the air nozzle 15 of No. 4, and this air ejection action causes the exhaust gas in the combustion chamber 2 to reach the chimney 1.
0 to the outdoors B, while the discharge pipe 13
The combustion air from the exhaust gas passage 9 is preheated by high-temperature exhaust gas passing through the exhaust gas passage 9, and is then supplied to the gas header 7 for combustion.

FIG. 2 shows a safety circuit diagram when a safety circuit for detecting abnormal conditions of the cooking gas stove is added.

That is, a flame detection sensor 22 and a temperature sensor 23 are provided in the plurality of stove bodies 1, and a gas sensor 24 is provided in the exhaust gas passage 9, and when the gas is set in the cooker 18, the air control valve 26 is activated by a signal from the gas valve unit 25. is opened, and an amount of air corresponding to the amount of gas flow and liquid is supplied.

Note that, as the number of stoves in use increases, the number of rotations of the fan 12 increases accordingly.

Then, while the stove is in use, the flame detection sensor 22
outputs a misfire signal, or if the unburned gas sensor 24 detects an unburned gas concentration higher than the reference value,
A shutoff valve (not shown) built into the gas valve unit 25 is activated to stop the gas supply to the stove, and at the same time, the air flow control valve 26 of the stove is fully opened for a certain period of time. The rotational speed of the fan 12 is also maximized, and the unburned gas is immediately released outdoors. Additionally, an indicator light notifies the user of the abnormal condition.

In this case, the air flow control valve 26 of the stove in normal operation is controlled to an appropriate opening degree by feedback of the output of the VVVF.

Furthermore, if the user leaves the stove in a combustion state, the inside of the combustion chamber 2 will overheat, but this state will be detected by the temperature sensor 23, and at the same time, the gas cutoff valve will be forcibly closed, and at the same time the minimum gas flow rate (not shown) will be set. The bypass is opened and combustion continues at minimum firepower. Even in this case, the indicator light notifies the user of the abnormal condition.

In any of the above cases, if the user fully closes the cock 18, it will be reset so that it can be re-ignited.

(Effects of the invention) As is clear from the above explanation, according to the invention, thermal efficiency is improved because chemical sensible heat from gas combustion is transferred to solid radiation by the side wall of the combustion chamber and transferred to the container. . Further, since the exhaust gas in the combustion chamber is forcibly exhausted outdoors, the exhaust gas is not released indoors, which is sanitary, and there is no risk of gas poisoning or gas explosion indoors.

Furthermore, since the combustion air is preheated by the exhaust gas, it is possible to reduce gas consumption.

[Brief explanation of drawings]

FIG. 1 is an explanatory sectional view of a gas cooking stove of the present invention, and FIG. 2 is a safety circuit diagram thereof. 1... Stove body, 2... Combustion chamber, 3... Side wall, 4... Crater, 6... Exhaust gas port, 7... Header, 9... Exhaust gas passage, 11... Air passage, 12
... Fan, 13 ... Discharge pipe, 14 ... Eductor, 15 ... Air nozzle, 16 ... Ring-shaped burner, 17 ... Gas ring, 18 ... Kotoku, 19
...Gas line, A...Indoor, B...Outdoor, C...
…container.

Claims (1)

[Scope of utility model registration request] a combustion chamber made of a fireproof material, including a ring-shaped burner on the outside of a crater provided on a side wall, and an exhaust gas port at the center bottom; an exhaust gas passage connected to the exhaust gas port at one end and extending outdoors; around the exhaust gas passage so that one end is connected to a gas header provided surrounding the combustion chamber so as to have the burner therein, and the other end is connected to a discharge pipe having a fan that is driven in conjunction with the burner. A cooking gas stove comprising an air pipe concentrically provided in the air pipe, and an exhaust gas suction means having an air nozzle facing the exhaust gas passage via an eductor branching from the discharge pipe.