CN103438453A - Internal-injection burner for gas cooker - Google Patents

Abstract

The invention relates to an internal injection burner used in a gas cooker, which belongs to a domestic gas cooker, and solves the problems of large CO and NOx emissions of existing burners and the need to improve the combustion efficiency, so as to meet the national energy-saving and environmental protection standards. The invention includes a base, an injection pipe, a connecting ring, a furnace head, and a fume hood. The injection pipe is fixedly connected with the base. The inner wall has a plurality of fire holes evenly distributed along the circumference. The flame of the fire hole of the present invention is sprayed inward, which can make the flame heat the bottom of the pot intensively and improve the thermal efficiency; when the gas burns, an upward airflow is formed to play a suction function, and the secondary air can be supplemented from the center of the bottom of the gas burner, the combustion is sufficient, and the exhaust gas is discharged few. It can greatly improve the combustion efficiency, greatly reduce the emission of CO and NOx in the flue gas, and meet the national energy conservation and environmental protection standards.

Description

An internal jet burner for a gas cooker

technical field

The invention belongs to a household gas cooker, in particular to an internal spray burner used for a gas cooker.

Background technique

The combustion method of existing gas stoves is atmospheric open combustion, the flame is sprayed outwards, and the bottom of the pot cannot be heated intensively, and the residence time of the flue gas formed by combustion is not enough at the bottom of the pot. The amount of premixed air in atmospheric open combustion is generally theoretical air 60% of the required amount, a large amount of secondary air is required, resulting in a large amount of flue gas and low temperature of the flue gas, which affects heat transfer, so its thermal efficiency is low, and most of them do not exceed 55%; existing gas stoves need to increase power at the same time It is very difficult to improve thermal efficiency. The new national standard "Household Gas Cookers" requires that the thermal efficiency of desktop cookers should be ≥55%, and the thermal efficiency of embedded cookers should be ≥50%, which is nearly 5 percentage points higher than the original standard. Another important direction of my country's stove research and development. At the same time, the thermal efficiency in the national standard of gas stoves has been upgraded from a recommended clause (B) to a mandatory clause (A), which means that the energy-saving issue is severe and urgent.

Contents of the invention

The invention provides an internal-injection burner for a gas cooker, which solves the problems of large CO and NOx emissions and needs to improve the combustion efficiency of the existing burner, so as to meet the national energy-saving and environmental protection standards.

An internal jet burner for a gas cooker provided by the present invention includes a base, an injection pipe, a connecting ring, a burner head, and a smoke hood. The injection pipe is fixedly connected to the base, and the base And there is a connection ring, a burner and a smoke hood on the top, which is characterized in that:

The base is a cylinder with an annular hollow interlayer on the cylinder wall. The cylinder is partially cut by an inclined plane forming an acute angle with its axis. The injection pipe is fixedly connected with the base for gas injection;

The connecting ring is composed of an inner ring and an outer ring concentrically connected together, the width of the ring connecting part between the inner ring and the outer ring is adapted to the width of the hollow interlayer of the base, and the ring connecting part has uniformly distributed The bottom end of the inner ring has an integrated end cover for connecting with the base, the end cover has evenly distributed air intake holes, and the outer wall of the outer ring has a ring for connection skirt;

The burner head is composed of an inner cylinder and an outer cylinder concentrically connected at the top, an annular gas passage is formed between the inner cylinder and the outer cylinder, and the width of the annular gas passage is the same as the width of the annular connection part of the connecting ring Correspondingly, the inner cylinder has a plurality of fire holes evenly distributed along the circumference;

The fume hood is a rotating body with a right-angled trapezoidal section, the inner diameter of the bottom surface of the rotating body is the same as the diameter of the inner cylinder of the burner head, and the outer diameter of the bottom surface of the rotating body is the same as the diameter of the outer cylinder of the burner head;

The connecting ring is placed on the base, the inner ring and the outer ring of the connecting ring are sleeved on the cylinder wall of the base, and the annular connecting part is matched with the top end of the annular hollow interlayer;

The burner head is placed on the connecting ring, the annular gas channel matches the annular connecting part, and the evenly distributed ventilation holes on the annular connecting part are used to pass the gas from the annular hollow interlayer to the annular gas channel;

The fume hood is placed on the furnace head, and the two are directly matched and assembled.

As for the internal spray burner, the shape of the fire holes on the inner cylinder of the burner head can be rectangular, and the number can be 28-36.

For the internal injection burner, the flue gas hood can be a rotating body with a cavity to reduce its own weight.

When the present invention works, the fuel is sprayed into the injection pipe by the nozzle of the external equipment, and a part of the air (primary air) is injected under a certain pressure into the annular hollow interlayer of the base from the injection pipe, and the annular hollow interlayer passes through the connecting ring. The evenly distributed air holes and the annular gas channel of the burner jointly form a gas mixing chamber, and the secondary air can be supplemented by the air inlet on the connecting ring end cover on the upper part of the base. A premixed mixture of fuel and air is ejected inward through the fire holes in the burner. (Primary air refers to the air that enters the combustion tube together with the fuel and is ejected from the nozzle due to the ejection effect of the nozzle, and the secondary air refers to the air supplemented from the surrounding air during the combustion process).

The flame of the existing gas stove is sprayed outwards, and the bottom of the pot cannot be heated intensively, and the residence time of the flue gas formed by combustion is not enough at the bottom of the pot, resulting in low efficiency and wasting energy. The air mixing chamber of the present invention can organize a good aerodynamic field and realize rapid and uniform mixing of gas and air. The internal spray structure can make the flame heat the bottom of the pot intensively and improve thermal efficiency; the smoke hood can make the combustion smoke Stay on the bottom of the pot and the wall of the pot for a long enough time, so that more heat of the flue gas can be used to heat the whole pot body, better use of the heat generated by combustion, and due to the effect of the flue gas, the pot is separated from the external air Both heat conduction and heat convection are reduced, greatly improving efficiency. And because the secondary air enters from the bottom of the burner, an upward airflow is formed when the gas is burned, and the suction function can be used to supplement the secondary air, so that the combustion is complete and the exhaust gas emission is small. The experimental results show that the heat absorption efficiency of the pot surface reaches 65%, the CO emission is below 100ppm, the NOx emission is below 100ppm, and the CO and NOx emissions are far below the national energy conservation and environmental protection requirements.

Description of drawings

Fig. 1 is the three-dimensional schematic diagram of the present invention;

Fig. 2 is a top view of the present invention;

Fig. 3 is a three-dimensional schematic diagram of the combination of the base and the injection tube;

Fig. 4 is a top perspective schematic diagram of the connecting ring;

Fig. 5 is a three-dimensional schematic diagram of the connecting ring viewed from above;

Figure 6 is a sectional view of the connecting ring

Fig. 7 is a three-dimensional schematic view of the burner head;

Fig. 8 is a sectional view of the furnace head;

Fig. 9 is a three-dimensional schematic diagram of a fume hood;

Fig. 10 is a cross-sectional view of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 and 2, the embodiment of the present invention includes a base 4, an injection tube 5, a connecting ring 3, a burner head 1, and a smoke hood 2, and the injection tube 5 is fixedly connected with the base 4, and the base A connecting ring 3, a burner 1 and a fume hood 2 are arranged on the seat 4 from bottom to top;

As shown in Figure 3, the base 4 is a cylinder with an annular hollow interlayer 4-1 on the cylinder wall, the cylinder is cut by a bevel that forms an acute angle with its axis, and the bottom end of the annular hollow interlayer 4-1 Closed, the annular hollow interlayer is used for passing in gas, and the injection pipe 5 is fixedly connected with the base 4 for passing in gas;

As shown in Fig. 4, Fig. 5, and Fig. 6, the connecting ring 3 is composed of an inner ring 3-1 and an outer ring 3-2 concentrically connected together, and the inner ring 3-1 and the outer ring 3-2 The width of the annular connection part 3-3 between is adapted to the width of the hollow interlayer of the base, the annular connection part 3-3 has evenly distributed ventilation holes 3-3A, and the bottom end of the inner ring 3-1 has an integral The end cap 3-4 is used to connect with the base 4, and the end cap 3-4 has uniformly distributed air inlet holes 3-4A, and the outer wall of the outer ring 3-2 has an annular ring for connection Skirt 3-5;

As shown in Fig. 7 and Fig. 8, the furnace head 1 is composed of an inner cylinder 1-1 and an outer cylinder 1-2 concentrically connected at the top to form an integral body, and the inner cylinder 1-1 and the outer cylinder 1- 2 to form an annular gas channel 1-3, the width of the annular gas channel 1-3 is adapted to the width of the annular connection part 3-3 of the connecting ring, and the inner cylinder 1-1 has multiple holes evenly distributed along the circumference 1 fire hole 1-1A;

As shown in Figure 9, the flue gas hood 2 is a rotating body with a right-angled trapezoidal section, the inner diameter of the bottom surface of the rotating body is the same as the diameter of the inner cylinder 1-1 of the furnace head, and the outer diameter of the bottom surface of the rotating body is the same as that of the furnace head inner cylinder 1-1. The diameters of the outer cylinders 1-2 are the same;

As shown in Figure 10, the connecting ring 3 is placed on the base 4, the inner ring 3-1 and the outer ring 3-2 of the connecting ring are sleeved on the cylinder wall of the base 4, and the ring connecting part 3-3 Cooperate with the top of the annular hollow interlayer 4-1;

The burner head 1 is placed on the connecting ring 3, the annular gas channel 1-3 is matched with the annular connecting part 3-3, and the evenly distributed ventilation holes 3-3A on the annular connecting part 3-3 are used to pass through the The annular hollow interlayer 4-1 passes gas to the annular gas channel 1-3;

The fume hood 2 is placed on the furnace head 1, and the two are directly matched and assembled.

In this embodiment, the burner head is about 3 cm high, and the shape of the fire hole on the inner cylinder of the burner head is rectangular, with a length of about 5.5 mm and a width of about 3.5 mm. The upper end of the burner hole is about 1 mm away from the top of the burner head, and the number of fire holes is 28 to 36.

The fume hood is a rotating body with a cavity, about 2.5cm high, to reduce its own weight.

The location of each fire hole determines the degree of concentration of firepower and the state of combustion. If the fuel is different and the power of the gas stove is different, the conditions and positions of the formation of CO and NOx are different, and the size parameters of a single fire hole are different. By adjusting the size of the rectangular fire hole and the size of the cylindrical channel, the fuel can be made in a suitable position. Regional combustion is not only conducive to complete combustion, but also can inhibit the formation of NOx, so as to achieve efficient and clean combustion.

Claims (3)

1. An internal jet burner for a gas cooker, comprising a base (4), an injection pipe (5), a connecting ring (3), a burner (1), a smoke hood (2), an injection The pipe (5) is firmly connected with the base (4), and the base is provided with a connecting ring, a burner and a fume hood from bottom to top, and is characterized in that: The base (4) is a cylinder with an annular hollow interlayer (4-1) on the cylinder wall, the cylinder is partially cut by a bevel that forms an acute angle with its axis, and the bottom end of the annular hollow interlayer (4-1) Closed, the annular hollow interlayer is used to feed gas, and the injection pipe (5) is fixedly connected to the base (4) for feeding gas; The connecting ring (3) is composed of an inner ring (3-1) and an outer ring (3-2) connected concentrically, and the inner ring (3-1) and the outer ring (3-2) The width of the annular connection part (3-3) is adapted to the width of the hollow interlayer of the base, the annular connection part (3-3) has uniform air holes (3-3A), and the inner ring (3-3A) 1) The bottom end has an integral end cover (3-4), which is used to connect with the base (4), and the end cover (3-4) has evenly distributed air inlet holes (3-4A), and the The outer wall of the outer ring (3-2) has an annular skirt (3-5) for connection; The furnace head (1) is composed of an inner cylinder (1-1) and an outer cylinder (1-2) concentrically connected at the top, and the inner cylinder (1-1) and the outer cylinder (1- 2) An annular gas passage (1-3) is formed between them, the width of the annular gas passage (1-3) is adapted to the width of the annular connection part (3-3) of the connecting ring, and the inner cylinder (1-1 ) has a plurality of fire holes (1-1A) uniformly distributed along the circumference; The fume hood (2) is a rotating body with a right-angled trapezoidal section, the inner diameter of the bottom surface of the rotating body is the same as the diameter of the inner cylinder (1-1) of the burner head, and the outer diameter of the bottom surface of the rotating body is the same as the outer circle of the burner head. The diameter of cylinder (1-2) is identical; The connecting ring (3) is placed on the base (4), the inner ring (3-1) and the outer ring (3-2) of the connecting ring are sleeved on the cylinder wall of the base (4), and the annular connection The part (3-3) cooperates with the top end of the annular hollow interlayer (4-1); The burner head (1) is placed on the connecting ring (3), the annular gas channel (1-3) matches the annular connecting part (3-3), and the uniformly distributed The vent hole (3-3A) is used to pass gas from the annular hollow interlayer (4-1) to the annular gas channel (1-3); The fume hood (2) is placed on the furnace head (1), and the two are directly matched and assembled. 2. The internal injection burner as claimed in claim 1, characterized in that: The shape of the fire holes (1-1A) on the inner cylinder (1-1) of the furnace head is rectangular, and the number is 28-36. 3. The internal injection burner as claimed in claim 1 or 2, characterized in that: The fume hood (2) is a rotating body with a cavity to reduce its own weight.

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