JPS6338817A - Gas combustion device - Google Patents

Abstract

PURPOSE:To eliminate the generation of abnormal sounds or the heating of a blower under the state of a pilot flame, by a method wherein the amount of air, discharged to the outside through a main air pipeline, and the amount of air, supplied into a mixer through a branch air pipeline, are regulated respectively. CONSTITUTION:When a main regulating valve 22 is closed gradually, the amount of pressure air, discharged to the outside of the title device through an opening 20a, is reduced and the pressure air is supplied into a mixer 4 through a branch air pipeline 21 in corresponding to the reduced amount of the pressure air discharged to the outside. Most of the pressure air is discharged to the outside through the opening 20a when the main regulating valve 22 of the main air pipeline 20 is opened fully, however, the small amount of the pressure air is supplied into the mixer 4 through the branch air pipeline 21, therefore, the pilot flame state of a main burner 5 is maintained even when the main regulating valve 22 is fully opened and the pressure air, discharged out of a blower, is discharged to the outside through the opening 20a. Accordingly, the delivery load of the blower becomes constant regardless of the states of strong fire or weak fire and abnormal sounds will never be generated under the state of the pilot flame.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a gas combustion device that mixes gaseous fuel with air and burns the mixture through a burner.

(Prior Art) Conventionally, there is a gas combustion apparatus as shown in FIG. 3, for example.

In FIG. 3, a conventional gas combustion apparatus G includes a fuel supply pipe 2 capable of supplying gaseous fuel, an air pipe 3 capable of supplying pressurized air, this fuel supply pipe 2 and air Conduit 3
a mixer 4 that is connected to the mixer 4 and that mixes gas fuel and air to generate a mixed gas of a predetermined mixing ratio; and a main burner 5 that is read by the mixer 4 and receives the mixed gas supplied from the mixer 4 and generates a combustion flame. It is mainly composed of.

The outer end of the fuel supply pipe 2 is connected to a gas valve such as city gas, and the other end is connected to the mixer 4. The solenoid gas valve 8° zero governor 7 and orifice 13 are installed on the upstream side, and the zero-gen gas valve 8 is a hook that can cut off the gas flow, and the solenoid gas valve 8 is electrically opened and closed to prevent the fuel from flowing. It is possible to control the flow of fuel gas flowing in the supply pipe 2, and also to
It is turned ON and OFF in conjunction with 9. Further, the zero governor 7 automatically adjusts the pressure state on the downstream side of the orifice 13 and maintains good flow of gas fuel flowing through the fuel supply pipe 2.

On the other hand, a blower 9 is connected to the tip of the air pipe 3, and the blower 9 can supply pressurized air into the air pipe 3. In addition, an air amount adjustment valve 10 is disposed in the air pipe line 3, and this air amount adjustment valve 1
0, the flow rate of the pressurized air flowing through the air pipe line 3 was incorrectly adjusted.The bypass pipe line 3a is branched from the upstream side of this air volume adjustment valve 10, and the bypass pipe line 3a is not used for this air volume adjustment. It is arranged in the air pipe line 3 in parallel with the valve 10, and an orifice 11 is installed inside the air pipe line 3. In the figure, 12 is an orifice.

In the conventional gas combustion apparatus G configured as described above, the blower 9 starts operating when the external starting swig is turned on, and at the same time, the electromagnetic gas valve 7 is turned on. Therefore, pressurized air is supplied into the air pipe line 3 by the operation of the blower 9, and the supplied pressurized air is supplied to the mixer 4 through the orifice 12 with its flow rate adjusted by the air amount control valve 10. . At the same time, inside this mixer 4 is a magnetic gas valve 8. zero governor 7
, gas fuel is supplied from the fuel supply pipe 2 through the orifice 13. In the mixer 4, the gas fuel is mixed at a predetermined ratio with respect to the flow rate of the supplied pressurized air, and a mixed gas having a constant mixing ratio is generated. The generated mixed gas is supplied to the main burner 5 through the mixed gas pipe 14 and burned there. The flame of the main burner 5 is adjusted by adjusting the air amount adjustment valve 10, and as the air amount adjustment valve 10 is gradually closed, the amount of pressurized air flowing through the air pipe 3 is reduced. Accordingly, the amount of gas fuel supplied into the mixer 4 also decreases, and the amount of mixed gas supplied to the main burner 5 decreases, resulting in a low flame. In order to leave a pilot flame in the main burner 5 when the air amount adjustment valve 10 is fully closed, the bypass pipe 3a is completely formed, and when the air amount adjustment valve 10 is fully closed, the heat supplied from the blower 9 is removed. Pressurized air is supplied to the mixer 4 through the bypass line 3a. Therefore, due to the presence of the bypass pipe 3a, the air amount control valve 10
Even when the main burner 5 is fully closed, the ignition state of the main burner 5 continues.

Incidentally, in FIG. 3, reference numeral 15 is a casing forming a combustion appliance, and a combustion chamber S is formed inside the casing, and the main burner 5 is installed within this combustion chamber S. Further, a trivet 16 is installed around the lower opening of the casing 15, and a pot 17 for Chinese food is placed on the trivet 16.
etc. can be placed therein to cook food inside the pot 17.

(Problems to be Solved by the Invention) In the conventional gas combustion device G configured as described above, the air amount control valve 10 is fully closed by the bypass pipe 3a provided in the air pipe 3. At times, the main burner 5 continues to be in the pilot state, but at that time the blower 9 is rotating at a constant speed, so a constant amount of pressurized air is always being discharged from the blower 9. While the pressurized air passes through the narrow/J% orifice 11 in the bypass pipe 3 and reaches the mixer 4, the pressurized air is forced to pass through the pipe because the pipe is narrow. There is a problem in that a high-pitched abnormal sound is emitted due to this, and the abnormal sound scatters as noise in the surrounding area.

Further, along with the generation of this abnormal noise, an abnormal load is generated on the discharge side of the blower 9, which causes the blower 9 to overheat.

To solve these problems, air volume adjustment valve 1
It would be good to control the discharge function of blower 9 in conjunction with the blower 9 when the engine approaches the fully open state, but controlling the motor of blower 9 is usually not done because it is expensive. However, the problems mentioned above still exist.

(Means for Solving the Problems) The present invention has been devised in view of the above-mentioned conventional problems, and when adjusting the heat power of the main burner, there is no need to apply any load to the blower even in a low flame state. The purpose is to provide a gas combustion device that does not require a gas combustion system, and its gist is to provide a fuel supply pipe that supplies gaseous fuel, an air pipe that is connected to a blower that supplies combustion air, and a fuel supply pipe that supplies combustion air. A gas combustion apparatus comprising a mixer connected to a fuel supply pipe and mixing fuel and air at a predetermined mixing ratio, and a burner connected to the mixer, the air pipe having a blower at one end. A main air conduit having an opening at the other end and a control valve for adjusting air flow inside, and a branch that branches from the upstream side of the control valve of the main air conduit and is connected to the mixer. supplying the air into the mixer through the branch air pipe by adjusting the control valve of the main air pipe to adjust the amount of air released to the outside from the opening of the main air pipe. It is configured to adjust the amount of air that is supplied.

(Function) The air pipe line that supplies combustion air to the mixer is composed of a main air pipe line and a branch air pipe line, and one end of the main air line is equipped with a blower, and the other end is provided with an opening. By installing a control valve for adjusting the air flow rate between the blower and the opening, the pressurized air generated by the blower passes through this main air pipe and exits from the opening at the outer end. The amount released is regulated by adjusting the control valve. Further, the branch air pipe is branched from the upstream side of the control valve of the main air pipe, and the other end is connected to the mixer, and the amount of pressurized air flowing through the main air pipe is adjusted by adjusting the control valve. By this, the amount of pressurized air supplied into this branch air pipe is adjusted. That is, when the control valve is in the open state, most of the pressurized air generated by the blower is released to the outside from the opening of the main air pipe, but as the control valve is gradually closed, the pressurized air is released from the opening. The amount of pressurized air released is reduced,
Pressurized air is supplied into the branched air line accordingly, and the pressurized air is supplied to the mixer. When the control valve is fully open, pressurized air is not released from the opening of the main air line, so almost all of the pressurized air is supplied into the mixer through the branch air line. In other words, the burner is in a high flame state.

By adjusting the control valve of the main air line in this way, the amount of pressurized air released to the outside from the opening of the main air line can be adjusted, and by adjusting the amount of released air, the amount of pressurized air released into the branch air line can be adjusted. Since the amount of pressurized air that flows is adjusted, the blower only needs to continue discharging a constant amount of pressurized air, and since there are no obstacles on the discharge side, the blower operates without receiving any discharge resistance, which prevents the blower from overheating. Never. Furthermore, since the pressurized air is discharged to the outside from the opening of the main air pipe when the burner is in a low flame state, abnormal noises do not occur when the burner is in a low flame state, unlike the conventional burner.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a schematic configuration diagram of the gas combustion apparatus of this example. In the figure, the same members as those in the conventional structure in FIG. 3 will be described with the same reference numerals. That is, the gas combustion apparatus GK shown in FIG. 1 has almost the same members as the conventional one, including the fuel supply pipe 2 and the main part in the pipe 2, the electromagnetic gas valve 8, the zero governor 7, the orifice 13, etc. All the cocks are the same as conventional ones, and the mixer 4 and main burner 5 are also the same.

In this example, the air conduit has a configuration different from that of the conventional one. That is, the air pipe line in the gas combustion apparatus GK of this example is composed of two pipe lines, one of which is connected to the blower.
The other end is a main air line 20 connected to the mixer 4, and the other side is a branch air line 21 connected to the mixer 4.

A blower 9 is connected to the tip of the main air line 20, and pressurized air is supplied from the blower 9 to the main air line 20.
supplied within. The other end of the main air pipe line 20 is an opening 20a, which connects the blower 9 and the opening 2.
A main control valve 22 is disposed between Oa. The main control valve 22 is a butterfly-type valve, and can be adjusted manually or electrically to adjust the amount of pressurized air flowing through the main air pipe 20, and releases the pressurized air to the outside from the opening 20a. The amount of pressurized air can be adjusted. Also, this main control valve 2
2, there is an auxiliary pipe line 23 branched from the main air pipe line 20, and this auxiliary pipe line 23 has an auxiliary valve 2.
4 is placed. Further, on the upstream side of this auxiliary pipe line 23, the branch air pipe line 21 is branched approximately at right angles to the main air pipe line 20.

Therefore, when the blower 9 is turned on, the pressurized air generated by the blower flows through the main air pipe 20, and when the main control valve 22 is in the open state, most of the pressurized air flows outside through the opening 20a. The release can be discussed. Main control valve 2
2 gradually closes, the amount of pressurized air discharged to the outside from the opening 20a decreases, and the pressurized air is supplied into the branch air pipe 21 and to the mixer 4 accordingly.

That is, when the main control valve 22 is fully open, the pressurized air released from the opening 20a to the outside becomes zero, and most of the pressurized air generated from the blower 9 passes through the branch air pipe line 21 to the mixer. 4. That is, in this state, the flame of the main burner 5 reaches its maximum and becomes a strong flame state. By gradually opening the main control valve 22 and releasing pressurized air to the outside from the opening 20a, the flame of the main burner 5 gradually shifts to a low flame state.

The auxiliary valve 24 is for releasing a part of the pressurized air to the outside in order to maintain the high flame state of the main burner 5 at a constant value when the main control valve 22 is fully closed, for example. For example, when a cooker to which the gas combustion device GK of this embodiment is attached is moved from a 50 Hz area to a 60 Hz area, the heat power for the high flame state can be set. That is, the auxiliary valve 24 is a valve used to set the firepower at the time of installation.

In the gas combustion device GK of this example, the main air pipe 2
When the main control valve 22 of No. 0 is fully opened, most of the pressurized air is released to the outside from the opening 20a, but a small amount of pressurized air is supplied into the mixer 4 via the branch air pipe line 21. Even when the main control valve 22 is fully opened, the pilot flame state of the main burner 5 is maintained. The setting of the firepower in such a pilot flame state can also be adjusted and set by the auxiliary valve 24.

The gas combustion apparatus GK of this example has a combustion curve shown in FIG. That is, it is a graph representing the strength of the flame of the burner 5 with respect to the opening degree of the main control valve 22, and in this example, the main control valve 22 is gradually tightened from the fully open state. As a result, the flame of the burner 5 gradually shifts to a strong flame, and the transition curve becomes approximately proportional to the opening/closing angle of the main control valve 22, and conversely, the main control valve 22 is gradually opened in the opening direction. Sometimes a similar curve occurs.

That is, in the conventional device, the control valve 10 is
When opening the main control valve 22 slightly, the flame suddenly becomes high, making it extremely difficult to fine-tune the flame to a low flame.However, in the gas combustion device GK of this example, the opening/closing angle of the main control valve 22 and the intensity of the burner flame are proportional. This has the effect of particularly improving the adjustment of firepower in low-heat conditions. or,
There is no need for a bypass line like in the past, and the pressurized air discharged from the blower 9 is discharged to the outside from the opening 20a even in the pilot flame state, so the discharge load of the blower can be reduced to high or low heat. It remains constant regardless of the situation, and no abnormal noise occurs in the pilot fire state.

Furthermore, in this example device, the main air pipe line 20 and the main control valve 22 can be placed at a position independent of the fuel supply line 2, so that the air line 3
This eliminates the problem that the fuel supply pipe 2 is concentrated on the front panel side of the cooker, which increases the piping cost, and the air pipe is separated from the fuel supply pipe 2, making it easier to cook. It also has the effect of reducing the manufacturing cost of the entire vessel.

Furthermore, the pressurized air discharged to the outside from the opening 20a of the main air conduit 20 in the pilot state can be used for various other purposes. That is, the released pressurized air is used for air raying of the hot water in the pot 17,
It is possible to improve the heating state of hot water, and the released pressurized air can be ejected in the shape of the deck of the cooker and used for cooling the cooker. It is also possible to provide pressurized air for cooling workers by blowing it onto the air. It can also be used for ventilation in the cooking room.

(Effects of the Invention) The gas combustion device of the present invention includes a fuel supply pipe for supplying gaseous fuel, an air pipe connected to a blower for supplying combustion air, the air pipe and the fuel supply pipe. In a gas combustion apparatus, the air pipe is connected to a blower at one end and has a blower at the other end. a main air conduit having an opening formed in the section and a control valve for adjusting air flow disposed therein, and a branch conduit branching from the upstream side of the control valve of the main air conduit and connected to the mixer. By adjusting the control valve of the main air pipe to adjust the amount of air released to the outside from the opening of the main air pipe, the air is supplied into the mixer through the branch air pipe. By adjusting the amount of air, no abnormal noise is generated in the pilot flame state, and no heating of the blower occurs, unlike in the prior art. Furthermore, it has the effect that the pressurized air discharged to the outside can be used for other purposes.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of the gas combustion device of the present invention, Fig. 2 is a combustion curve diagram comparing the opening degree of the control valve and the strength of the burner flame in the gas combustion device of Fig. 1, and Fig. 3 is a diagram of the conventional gas combustion device. FIG. 2 is a configuration diagram of a gas combustion device. GK...Gas combustion device 2...Fuel supply pipe 4.
...Mixer 5...Main burner 8...
- Electromagnetic gas valve 9... Blower 20... Main air pipe line 20a... Opening 21... Branch air pipe line 22... Main control valve 23... Auxiliary pipe line 2
4...Auxiliary valve

Claims (1)

[Claims] a fuel supply pipe that supplies gaseous fuel; an air pipe that is connected to a blower that supplies combustion air; In the gas combustion apparatus, the air pipe is equipped with a blower at one end, an opening at the other end, and a control valve for adjusting the air flow rate inside the air pipe. a main air pipe line, and a branch pipe line that branches from the upstream side of the control valve of the main air pipe line and connects to the mixer,
The amount of air supplied into the mixer through the branch air pipe is adjusted by adjusting the control valve of the main air pipe to adjust the amount of air released to the outside from the opening of the main air pipe. A gas combustion device characterized by being configured as follows.