KR100826711B1 - Burner system of heating cooker and heating cooker - Google Patents

Abstract

In the burner system of the heating cooking apparatus according to the present invention, the injection hole of the nozzle has a relationship (L) / length (D) of the injection hole of the injection hole is 0.9 ~ 1.1, in the mixing tube, the mixing tube The position of the neck bordering the contraction and extension according to the diameter of is characterized in that it lies in the middle zone when dividing the entire length of the mixing tube into thirds.

In the present invention, while the height of the burner port is reduced, a nozzle and a mixing tube are proposed in a predetermined shape and structure, so that a sufficient amount of air is introduced into the burner system, and the air and the gas can be smoothly mixed. . Therefore, high combustion efficiency can be obtained. In addition, although the heating cooking apparatus and the burner system are slimmer, there is an advantage that the apparatus is operated with the optimum operating reliability.

Description

Heating cooking appliance and burner system of the same}

1 is a perspective view of a heating cooker according to the present invention.

Figure 2 is an exploded perspective view of a heating cooking apparatus according to the present invention.

3 is a plan view of a heating cooker according to the present invention, showing a state in which the ceramic plate is removed.

4 is a cross-sectional view of the burner system according to the present invention, taken along the line II ′ of FIG. 1.

5 is a perspective view of the burner system of the present invention.

6 is a sectional view of a nozzle according to the present invention;

7 is a plot of the calorific value of the burner system compared to the length L of injection holes / diameter D of the injection holes.

8 is a plot of the air ratio of the burner system compared to the length (L) of the injection hole / diameter (D) of the injection hole.

9 is a cross-sectional view of the mixing tube in the burner system according to the present invention.

10 is a chart showing the amount of carbon monoxide generated in the combustion gas while changing the position of the neck.

11 is a sectional view of a nozzle according to a second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

15 nozzle 61 mixing tube 62 shrinkage

63: expansion portion 66: Thu 153: flow guide

156: discharge part

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker, and more particularly, to a heating cooker and a burner system of the cooking cooker capable of reducing the height of the heating cooker and obtaining high combustion efficiency and reducing air flow resistance.

Heat cooker is a device for cooking food by heating. In particular, the present invention relates to a gas cooktop in which heat generated in a gas combustion method is applied to food, and food is cooked by the heat. The cooktop is a device also referred to as a hot plate or a hob, and its use is increasing in recent years.

A burner system is applied to the cooktop operated by the gas combustion method. The burner system refers to a device that combusts combustion gas with air. In the burner system, the gas fuel is injected through a predetermined pipe, and the air is sucked into the burner port together by using a lower air pressure in the vicinity of the injected gas fuel. Then, the mixed gas introduced into the burner port is uniformly mixed in the burner port, and after being uniformly mixed, it is combusted, and heat generated by the burned air is transferred to the food in the manner of radiation and conduction. , The food is heated and cooked.

Conventional heating cooking apparatus is operated in such a way that the gas is discharged upward from the lower portion of the burner port in order to discharge smoothly after the mixed gas flows into the burner port. Therefore, there is a disadvantage that the height of the burner port is increased.

As the height of the burner pot increases, the height of the heating cooking apparatus also increases as a whole, so that the aesthetics of the user is lowered, material costs and logistics costs are high, and a lot of space is required for installation.

The present invention is proposed in the background described above, proposes a burner system of a heating cooker and a heating cooker to reduce the height of the burner port to improve the aesthetics of the user, and to reduce the manufacturing cost.

In addition, the maximum amount of air flows into the burner system together with the gas, thereby increasing the combustion efficiency of the gas to obtain a high calorific value, so that even if the burner system is slimmed, the heating cooking device and the heating cooker can obtain optimum operation reliability. Propose a burner system.

Heat cooker of the present invention, the case; A plate covering an upper surface of the case; A burner system mounted below the plate; And an exhaust disposed at one side of the plate, the burner system comprising: a burner port providing a mixing space in which at least gas and air are uniformly mixed; A mixing tube for supplying the gas and air into the burner port; And a nozzle placed at a predetermined distance from the mixing tube unit, wherein the discharge portion of the nozzle has a reduced outer diameter at an end portion, and the injection hole of the nozzle has a length (L) of the injection hole. The diameter (D) has a relationship of 0.9 to 1.1, and in the mixing tube, the position of the neck barking the contraction and expansion portions in accordance with the diameter of the mixing tube is equal to three times the total length of the mixing tube. Heat cooker, placed in the zone.

The burner system of the present invention comprises: a burner port providing a mixing space in which at least gas and air are uniformly mixed; A mixing tube for supplying the gas and air into the burner port; and a nozzle placed at a predetermined distance from the mixing tube, wherein the mixing tube includes a contraction portion in which the diameter is contracted, and an expanded diameter. Characterized in that it consists of expansion tube.

The burner system according to the present invention comprises: a burner port providing a mixing space in which at least gas and air are uniformly mixed; A mixing tube for supplying the gas and air into the burner port; And a nozzle placed in a state where a predetermined distance is maintained with the mixing tube, and the injection hole of the nozzle satisfies a relationship of the length L of the injection hole / diameter of the injection hole 0.9 to 1.1, Increase the amount of air flowing into the mixing tube.

The burner system according to the present invention comprises: a burner port providing a mixing space in which at least gas and air are uniformly mixed; A mixing tube for supplying the gas and air into the burner port; And a nozzle placed in a state where a predetermined interval is maintained with the mixing tube, wherein the mixing tube includes: a contracting portion in which gas and air injected from the nozzle are sucked; An expansion portion is provided, through which the air sucked through the contraction portion is discharged, and the neck separating the contraction portion and the extension portion is placed in the center region when dividing the entire length of the mixing tube into three.

According to the present invention, while the burner system is slimmed down, the maximum amount of air is introduced into the burner system together with the gas, thereby increasing the combustion efficiency of the gas to obtain high calorific value, improving the aesthetics of the user, manufacturing and moving. And the overall cost for installation is reduced.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention.

<First Embodiment>

1 is a perspective view of a heating cooker according to the present invention, Figure 2 is an exploded perspective view of the heating cooker according to the present invention.

1 and 2, the heating cooking apparatus of the present invention protects the lower side of the main body to form the overall appearance of the lower portion of the heating cooking apparatus and the upper side is opened, and seated on the upper surface of the case The ceramic plate 1 and a top frame 3 covering the edge portion of the ceramic plate 1 are included. In addition, as an additional external configuration of the heating cooking apparatus, the exhaust grill 13 formed at the rear portion of the cooking appliance to exhaust the combustion gas and the ceramic grill 1 are formed at approximately the front part of the cooking appliance to turn on / off gas combustion. There is a switch 14 to control the off. The position and shape of the exhaust grill 13 and the switch 14 may vary in various structures and formats. However, the exhaust unit 13 and the switching unit for controlling on / off of gas combustion should be provided. It is natural.

The internal space defined by the case 2 and the ceramic plate 1 accommodates a plurality of components for the combustion, exhaust, and control of the cooking appliance. In detail, the internal structure is demonstrated.

First, three burner ports 4 are provided which allow sufficient mixing of the gas and air so that combustion can occur uniformly thereafter. A mixing tube unit 6 is disposed on the side of each burner port 4 to supply a mixed gas through the side of the burner port 4. Then, the nozzle unit 5 is placed in a state where a predetermined distance from the inlet of the mixing tube unit 6 is maintained, and gas is injected toward the inlet of the mixing tube unit 6. A nozzle (see 15 in FIG. 3) is placed in front of the nozzle unit 5 to inject gas at a high speed toward the mixing tube unit 6.

The burner frame 11 is placed above the burner port 4. The burner frame 11 supports the position of the burner port 4 and provides an exhaust passage of the combustion gas burned on the glowing plate 12.

At the rear of the burner frame 11, an exhaust unit 10 through which combustion gas is discharged to the outside, and an exhaust grill 13 placed above the exhaust unit 10 are disposed.

The glowing plate 12 is placed on the opened upper surface of the burner port 4, and the glowing plate 12 is heated by the high heat generated during combustion of the mixed gas. When the glowing plate 12 is heated, radiant energy of a frequency band corresponding to the physical properties of the glowing plate 12 is radiated. The radiation energy of the glowing plate 12 includes at least the frequency of the visible light band, the user can recognize that the heating cooking apparatus of the present invention is in operation by the visible light. Of course, it is natural that the food is heated by the glowing plate 12, and the food is naturally heated by the conductive heat of the ceramic plate 1.

The gas supply structure supplied to the nozzle unit 5 will be described.

Gas is supplied from the outside of the heating cooking apparatus to the inside through the main gas supply pipe 8, and the supply of the gas toward each burner system is controlled by the gas valve 7 controlled by the switch 14. After passing through the gas valve 7, the gas is supplied to each nozzle unit 5 through the individual gas supply pipe 9 and injected through the nozzle 15.

3 is a plan view of a heating cooker according to the present invention, showing a state in which the ceramic plate is removed.

Referring to FIG. 3, two burner ports 4 which are relatively large are placed on both sides of the case 2, and a burner port having a small size is provided between the two burner ports 4. Therefore, the tableware corresponding to the calorific value of the burner pot 4 is placed so that the corresponding tableware is heated.

In addition, the burner port having a small size placed in the center of the case 2 is supplied with a mixed gas from the front to the rear, and the mixing of the air and the gas is completely performed. After the mixed gas is burned on the glowing plate 12, the mixture gas is exhausted toward the exhaust portion rearward. On the other hand, with two relatively large burner ports 4 placed on both sides of the case 2, the gas is supplied and combusted forward from the rear of the heating cooking apparatus, and the mixed gas is mixed secondly inside the burner port. After combustion, the combustion gas is exhausted toward the rear of the burner port after being burned on the glowing plate 12.

This arrangement of the burner ports 4 is for realizing the arrangement of the optimal heating burner system.

The burner system of the heating cooking appliance according to the present invention has a configuration of a burner system in which a maximum amount of air is sucked together with a gas and a mixture of gas and air is promoted by lowering the height of the burner so that combustion efficiency is not lowered. Suggest. One feature of the present invention is that the shape of the nozzle 15 and the mixing tube 61 is improved.

4 is a cross-sectional view of the burner system according to the present invention, which is a cross-sectional view taken along the line II ′ of FIG. 1, and FIG. 5 is a perspective view of the burner system of the present invention.

4 and 5, a burner port 4 is provided above the case 2. The mixing pipe unit 6 is disposed at the side of the burner port 4. The nozzle unit 5 is disposed at a position adjacent to the inlet of the mixing tube unit 6 at a predetermined interval from the mixing tube unit 6.

In detail, the nozzle unit 5 has a configuration in which a plurality of nozzles 15 are fixed to the nozzle holder 16 and in a state in which the plurality of mixing tubes 61 are fixed to the mixing tube unit 6. The mixing pipe unit is fixed to the burner port 4 side as a whole. Therefore, the relative fixing of the plurality of mixing pipes 61 and the burner ports 4 can be conveniently performed.

The mixing pipe unit 6 is aligned with the opening 42 of the burner port 4. In addition, since the plurality of mixing tubes 61 and the openings 42 provided in the mixing tube unit 6 are provided in parallel with each other, the amount of air introduced together with the gas is maximum.

The operation of the burner system of the present invention will be described.

The gas injected from the nozzle 15 flows into the mixing pipe 61 at a high speed. At this time, since the gas passing through the inlet of the mixing tube 61 is high speed, the adjacent space of the inlet of the mixing tube 61 becomes low pressure by Bernoulli theorem. Therefore, the outside air is also introduced into the mixing tube 61, and the fluid passing through the mixing tube 61 becomes a mixed gas of gas and air. The mixed gas passing through the mixing tube 61 is introduced into the internal space of the burner port 4 through the opening 42 and then mixed secondarily and burned on the glowing plate 12. The heat of combustion of the mixed gas heats the glowing plate 12 to make the glowing plate red, and radiant heat is generated in the glowing plate 12.

Here, the hole is innumerable in the heat plate 12, the mixed gas passes through and is burned, the combustion gas is guided to the exhaust section 10 along the exhaust flow path (111). The exhaust passage 111 may be defined as a space between the lower portion of the ceramic plate 1 and the upper portion of the burner frame 11.

As will be described, the mixing pipe 61 of the present invention is placed on the side of the burner port 4 to supply gas and air through the side of the burner port 4. The mixing pipe 61 is formed in a direction facing the burner port from the same side of the burner port 4 in a state where a plurality of the mixing pipes 61 are fixed to the mixing pipe unit 6. Therefore, even if the height of the burner port 4 is low, sufficient gas and air can be sucked in and combustion efficiency can be improved.

At this time, since the burner port 4 has a low height for slimming the cooking apparatus itself, a shape of the nozzle 15 and a shape of the mixing tube 61 are required.

In detail, a plurality of nozzles and mixing tubes are provided so that a large amount of gas and air should be introduced through the upper and lower intervals of the slimmed burner port 4. In addition, a large amount of air should be introduced by the moment of the gas together with the gas injected from the nozzle 15 so that a large amount of air may be introduced together with the gas. In addition, the mixing pipe through which the gas injected from the nozzle passes must not act as a resistance to the gas injected from the nozzle 15 and the air introduced together by the gas.

Hereinafter, the burner system of the present invention proposed to suit the above requirements will be described in detail.

6 is a cross-sectional view of the nozzle according to the present invention.

Referring to FIG. 6, the nozzle 15 has a tubular shape as a whole, and a fixing part 151 fixed to the nozzle holder 16 is provided at a rear portion thereof, and an outer surface of the fixing part 151 is provided. Threads are formed in the nozzle holder 16 so as to be rotated and inserted. In front of the fixing part 151, a stopper 152 for determining the insertion depth of the nozzle 15 is provided, followed by a discharge part 156 of the nozzle.

The discharge portion 156 is configured such that the front end portion thereof is condensed to increase the pressure of the gas, and the injection hole 155 is formed at the tip thereof.

The body diameter W1 of the discharge portion 156 is 5 millimeters, which is smaller than that of the conventional 7 millimeters, in order to be suitable for a burner port of low height. The tip diameter W2 of the discharge part 156 is 4 millimeters. As such, the body diameter W1 of the discharge part 156 is larger than the end diameter W2 of the discharge part 156 to smoothly flow the air flowing forward along the outer surface of the discharge part 156. It is to guide. In other words, it can be understood that the outer surface of the discharge end of the discharge unit 156 is chamfered.

In detail, the gas is injected at a high speed through the injection hole 156, and air follows the injection streamline of the injected gas. In other words, the air reaching the outer surface of the injected gas stream is caused to flow with the gas under no slip conditions. It may be understood that the moment of the gas streamline is applied to the surrounding air.

In order to smoothly follow the air to the gas streamline, it is preferable to allow the air to flow along the flow direction of the gas streamline. Therefore, in order to allow air to flow from the rear of the discharge portion 156 to the front, the end diameter of the discharge portion 156 is made smaller than the body diameter of the discharge portion, and the portion therebetween is the discharge portion. Provided is a flow guide 153 in which the diameter of 156 is gradually reduced toward the tip.

Technical features of the shape of the discharge part 156 may be understood by looking at the arrows indicating the flow of air shown in FIG. 6. When the end portions of the discharge portions 156 have the same diameter and the discharge portions are provided in a wide plane, a hypothetical comparative example in which air descends downward toward the injection hole along the ends of the discharge portions 156 is recalled. It will be fully understood that the flow of surface air, ie the flow of air along the streamline of gas, becomes difficult.

In addition, the size of the injection hole 155 is preferably provided with a length (L) and a diameter (D) similar to each other. This is to find the position where the gas flow injected from the injection port 155 transitions from laminar flow to turbulent flow, so that the turbulent transition takes place early in order to obtain more air inflow effect, and to promote the mixing of gas and air. It is for. This is because the longer the length of the injection hole 155, the longer the gas flow is injected in the laminar flow state, the shorter the shorter the shorter the gas flow transitions to the turbulent state. Of course, if the mixing of the gas and air is promoted it will be easily guessed that the combustion performance of the gas is improved by that much.

In order to examine the adequacy of the diameter of the injection hole 155 described above, the present inventors change the length (L) of the injection hole / diameter (D) of the injection hole, while generating heat and air ratio (gas inflow amount) of the heating cooker. Inflow of air to Of course, the above state was performed while maintaining various conditions such as the distance between the discharge port of the injection hole and the mixing tube.

7 is a plot of the calorific value of the burner system compared to the length L of injection holes / diameter D of the injection holes. Referring to FIG. 7, it can be seen that the heat generation amount is large when the length L of the injection hole / diameter D of the injection hole is 1, which shows the same aspect even if the diameter of the nozzle is changed.

8 is a plot of the air ratio of the burner system compared to the length L of the injection hole / diameter D of the injection hole. Referring to FIG. 8, it can be seen that the air ratio is the largest when the length L of the injection hole / diameter D of the injection hole is 1. This means that a rapid transition from laminar flow to turbulent flow results in a large amount of air. However, if the length of the injection hole is too short, the distance between the injection hole 155 and the inlet of the mixing tube becomes too narrow, so that a sufficient inflow interval of air cannot be obtained, so that the length of the injection hole cannot be too short.

In consideration of such a relationship, the injection hole of the present invention is such that the length L of the injection hole / diameter D of the injection hole has a relationship of 0.9 to 1.1. Methane was used as the gas fuel.

In the above, the shape of the nozzle capable of exhibiting the optimum effect has been proposed, and in the following, the shape of the mixing tube in which the gas injected by the nozzle and the air introduced together along the gas are specifically proposed.

9 is a cross-sectional view of the mixing tube in the burner system according to the present invention.

Referring to FIG. 9, the mixing tube of the present invention has a contraction portion 62 for allowing air to be smoothly guided into the mixing tube together with the gas flowing from the nozzle, and further expands and contracts at the contraction portion 62. An extension 63 for smoothly mixing gas and air passing through the portion 62 and a neck 66 provided at the boundary between the contraction portion 62 and the expansion portion 63 are included.

The contraction portion 62 may be referred to as a nozzle, and the expansion portion 63 may be referred to as a diffuser. The present inventors examined where the position of the neck 66 should be placed relative to the length of the entire contraction portion 62. In carrying out the review, the following points were considered as preconditions:

First, a low pressure (eg, 180 mmAq) gas may be injected from the nozzle when the heating cooker is operated at a low stage. In addition, a gas of high pressure (for example, 200 mmAq) may be injected, which is a case where the heating cooker is operated at a high stage. Since it is not possible to change the shape of the mixing tube according to the operating state of the heating cooking apparatus, the present inventors have proposed the shape of the mixing tube that can be optimally used in both cases described above.

In addition, if the position of the contraction portion 62 is too short, the inflow of air is reduced, and if the expansion portion 63 is too short, the turbulent flow is not smooth and the air is not mixed so that combustion is not smooth and the generation of carbon monoxide increases and exhausts. There is a disadvantage that the performance is degraded.

In order to improve this problem, the inventors have conducted various experiments to find out the relative position of the mixing tube 61 on which the neck 66 is placed.

Specifically, the position where the neck 66 is placed is preferably placed in an equally divided area in the middle when dividing the entire length of the mixing tube into three. More preferably, in the heat cooker of the present invention, since the injection port of the nozzle and the inlet port of the mixing tube are close to each other in order to achieve the miniaturization of the burner system, the position of the neck 66 is the sixth length of the mixing tube. When dividing, it is preferable to place in the third zone from the inlet side of the mixing tube. By suggesting the position where the neck 66 is placed in this way, it is possible to obtain a high combustion efficiency without the heating cooking equipment is operated at a low stage or a high stage, or a decrease in the efficiency thereof.

10 is a chart showing the amount of carbon monoxide generated in the combustion gas while changing the position of the neck.

Referring to FIG. 10, the case where the position of the neck 66 is located in a third quarter close to the inlet of the mixing tube is referred to as case 1, and the case where the position of the neck 66 is located at the center of the mixing tube is referred to as case 2. When the neck 66 is placed in a third quarter near the outlet of the mixing tube, the case 3 is the lowest carbon monoxide of about 18 ppm when the neck 66 is placed at the center of the mixing tube. It can be seen that.

Such a small amount of carbon monoxide is generated not only because a large amount of air flows smoothly, but also because the mixing of air and gas is faithfully performed, and a combustion reaction may occur uniformly later.

According to the above table, the adequacy of the inventor's idea can be seen as verified.

Second Embodiment

11 is a cross-sectional view of the nozzle according to the second embodiment of the present invention. The nozzle according to the second embodiment of the present invention is characterized in that the shape of the discharge portion is different, and other parts are the same as the original embodiment. Therefore, for the parts that do not have specific explanation, the description is used as it is.

Referring to FIG. 11, the nozzle 17 smoothly rounds the outer surface of the discharge part 156 to smoothly flow the air that flows together by the moment of the gas when the injection hole 155 gas is injected. The paper includes a round guide 154.

Since the round-shaped flow guide 154 does not change rapidly in the diameter of the discharge portion 156 and is smoothly rounded along the flow direction of air, the air following the gas flow follows the gas injection direction. There is an advantage that can be smoothly introduced.

In another case, even if the inlet side of the flow guide 153 is not rounded and the outlet side is rounded, the flow of air directly following the gas flow can be smoothly guided. By doing in this way, the manufacturing cost of a nozzle can be reduced and loss of inflow air can be made small or little.

The shape of the nozzle and the mixing tube as described above is preferably applied when gas is injected toward the inside of the burner port from the side of the burner port 4 in order to reduce the height of the heating cooking apparatus. As shown. However, the burner system of the present invention is also applied to other equipment other than the heating cooking equipment, and it is natural that many advantages can be obtained in terms of combustion efficiency and size of the equipment.

In addition, the mixing pipe has been described as a limited number is installed, but is not limited to this, it is natural that the idea of the present invention can be applied that a single mixing pipe and a nozzle is installed. However, in the case where a plurality of nozzles and a mixing tube are installed, the burner can generate a high calorific value by inflow of sufficient gas and air even when the inner height of the burner is low as 19.5 mm.

The spirit of the present invention is not limited to the accompanying embodiments, and those skilled in the art who understand the spirit of the present invention can easily suggest other embodiments falling within the scope of the same idea by adding, changing, deleting, and adding components. The present invention may be variously proposed by partially merging the above-described various embodiments, but this is also included in the spirit of the present invention.

In the present invention, while the height of the burner port is reduced, a nozzle and a mixing tube are proposed in a predetermined shape and structure, so that a sufficient amount of air is introduced into the burner system, and the air and the gas can be smoothly mixed. . Therefore, high combustion efficiency can be obtained.

In addition, although the heating cooking apparatus and the burner system are slimmer, there is an advantage that the apparatus is operated with the optimum operating reliability.

Claims (20)

case; A plate covering an upper surface of the case; A burner system mounted below the plate; And It includes an exhaust disposed on one side of the plate, The burner system, A burner port providing a mixing space in which at least gas and air are uniformly mixed; A mixing tube for supplying the gas and air into the burner port; And A nozzle placed in a state where a predetermined distance from the mixing tube unit is included, The discharge diameter of the nozzle is reduced in the outer diameter of the end portion, The injection hole of the nozzle has a relationship (L) / diameter (D) of the injection hole of 0.9 to 1.1, In the mixing tube, the position of the neck bordering the contraction and expansion portions according to the diameter of the mixing tube is placed in the middle region when dividing the entire length of the mixing tube into thirds, Heat cooker. The method of claim 1, At least two mixing tubes and nozzles are installed in the burner pot. The method of claim 2, The mixing tube is a heating cooker for supplying gas and air into the burner port from the side of the burner port. The method of claim 1, And an outer surface diameter of the discharge portion of the nozzle is gradually reduced. The method of claim 1, And the nozzle is fixed to a nozzle holder in which a plurality of nozzles are placed together. A burner port providing a mixing space in which at least gas and air are uniformly mixed; Mixing pipe for supplying the gas and air into the burner port; And It includes a nozzle which is placed in a state where a predetermined distance is maintained with the mixing tube, The mixing tube is a burner system consisting of a contraction portion is contracted in diameter, and the expansion tube is expanded in diameter. The method of claim 6, And the diameter of the discharge portion decreases from 5 millimeters to 4 millimeters. The method of claim 6, The outer diameter of the discharge portion of the nozzle is chamfered burner system. The method of claim 6, Burner system wherein the flow guide is provided in a round shape as a whole. The method of claim 6, The mixing tube is in the form of a plurality of mixing tube unit is fixed together, the burner system fixed to the side of the burner port. The method of claim 6, And a neck portion delimiting the constriction and expansion of the mixing tube is placed in the middle region when dividing the entire length of the mixing tube into thirds. A burner port providing a mixing space in which at least gas and air are uniformly mixed; A mixing tube for supplying the gas and air into the burner port; And It includes a nozzle which is placed in a state where a predetermined distance is maintained with the mixing tube, The injection hole of the nozzle has a length (L) / diameter of the injection hole (D) of the burner system to satisfy the relationship of 0.9 to 1.1, to increase the amount of air flowing into the mixing pipe. The method of claim 12, Burner system that the outer peripheral surface of the injection hole is contracted toward the front. The method of claim 12, The length (L) of the injection hole / diameter (D) of the injection hole is 1.0 burner system. The method of claim 12, And a plurality of nozzles are fixed to a single nozzle holder. A burner port providing a mixing space in which at least gas and air are uniformly mixed; A mixing tube for supplying the gas and air into the burner port; And It includes a nozzle which is placed in a state where a predetermined distance is maintained with the mixing tube, The mixing pipe may include a contraction part on which a gas and air injected from the nozzle are sucked; An expansion part for discharging the air sucked through the contraction portion is included, A burner system in which the neck separating the contraction and the extension is placed in the middle section when dividing the entire length of the mixing tube into thirds. The method of claim 16, And the neck is placed in a third zone from the front when dividing the entire length of the mixing tube. The method of claim 16, A plurality of the mixing pipe is provided, the mixing pipe unit in a state in which the plurality of mixing pipe is fixed, the mixing pipe unit is a burner system is fixed to the burner port as a whole. The method of claim 16, The burner system is placed on one side of the burner port, the plurality of mixing tubes provided in the same state. The method of claim 19, The plurality of mixing tubes are placed in the same direction facing the burner port.

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