KR101856453B1 - High efficiency gas burner and gas rice cooker having the same - Google Patents

Abstract

The present invention relates to a cooker for heating a rice cooker supplied with a gas and a gas burner applied thereto, including a hollow mixing pipe (100) for increasing the cross-sectional area of the flow path from a throttle having a narrow flow path to an outlet and a burner head (200) as a hollow ring-shaped pipe having an upper flame hole and a side flame hole formed on an upper portion and having a swirl chamber (S) having a flow path cross-sectional area larger than that of the mixing pipe at a portion coupled with the outlet of the mixing pipe. Some of the introduced gas and air in the mixing pipe are mixed by decreasing the flow rate through the throttle while the rest are mixed by decreasing the flow rate in the swirl chamber (S) after entering the burner head so that the gas and air to be burned can be mixed more uniformly. In addition, it is possible to heat the lower surface of the rice cooker from the center to the outer periphery by generating flames on the upper and side portions, and reduce the burning rate, thereby improving thermal efficiency.

Description

[0001] The present invention relates to a high-efficiency gas burner and a gas cooker having the same,

The present invention relates to a gas burner for generating a flame by supplying gas and burning it together with air, and a cooking machine using the gas burner.

Cooking machine is a typical kitchen appliance that can cook rice in large quantities and is usually used in places where large numbers of people eat such as school cafeteria, military barracks, and group feeding center. The cooking machine is classified into an electric cooker and a gas cooker according to the heat source of rice, and a large number of gas cookers are used in which gas such as LPG or LNG is supplied.

Basically, the gas burner has a structure in which a straight pipe is connected to a donut-shaped pipe. When gas such as LPG or LNG is simultaneously introduced into the gas burner together with the air, it first passes through a straight tube, and then after passing through a donut-shaped tube, it is discharged to the outside. The gas burner depends on whether the mixing of air and gas can be appropriately performed, whether it can be appropriately discharged to the outside in the course of turning the donut-shaped tube, and the way of the burned flame is greatly influenced by the thermal efficiency performance .

Korean Patent No. 10-0841430 discloses a gas burner having a high-burning double burner head, in which two annular burner heads are formed inside and outside. Since the flame is generated in the upper and lower directions and the burner head is formed in the upper and lower directions, the burner head is arranged at the lower side of the rice cooker There is a limit to increase in proportion to the area.

Korean Patent No. 10-0495670 '' Commercial gas cooker burner '' has a structure in which a dike is formed in each of the outer ridge portion and the inner ridge portion in a disc-shaped burner head. This can heat both the bottom surface and the outer surface of the rice cooker in one burner head, but there is a limit in that the burner head is increased in proportion to the bottom surface area of the rice cooker in that the flame is generated in the vertical direction. Further, as the thickness of the burner head is constant and the distance from the part where the burner head and the mixing tube are connected is distant from each other, the intensity of the flame weakens, and the rice cooker is heated unevenly.

The present invention provides a gas burner capable of improving the mixing performance of gas and air to reduce the incombustibility and generating a flame in both the upward direction and the lateral direction of the burner head to uniformly heat the central periphery and the outer periphery of the rice cooker, have. The present invention is not limited to the above-described technical problems, and another technical problem may be derived from the following description.

A gas burner according to an aspect of the present invention is characterized in that a throttle is formed in which a gas and air are introduced through an inlet opened to a straight pipe whose inside is hollow and a channel is narrower than an inlet at a point remote from the inlet side, The cross-sectional area of the channel increases from the outlet to the outlet; And a ring-shaped tube having an inner space therein. The gas and air are supplied to the outlet of the mixing tube, and a swirl chamber having a larger cross-sectional area than the mixing tube is formed at a portion connected to the mixing tube And a burner head having a plurality of upper flame holes and a plurality of side flame holes, each of which generates a flame outwardly.

A part of the gas and air introduced into the inlet of the mixing tube flows through the throttle of the mixing tube and flows to the outlet of the mixing tube so that the mixing is performed while the flow rate is decreased due to the volume increase of the flow path, And the rest of the air introduced into the swirling chamber of the burner head through the mixing tube is mixed while the flow velocity is decreased due to the volume increase of the flow path.

The swirling chamber inside the burner head is formed to be relatively longer than the left and right widths so that the air rising from the inside of the burner head and the air rising from the outside of the burner head are separated when the air located below the burner head rises Air rising from the inside of the burner head is supplied to the upper flame ball and air rising from the outside of the burner head in the lower portion of the burner head is supplied to the side flame Can be supplied to the ball.

The outer side of the burner head is formed into a convexly curved curved surface so that air rising from the outside of the burner head rises along the curvature outer side of the burner head and can be supplied to the side flame holes.

The burner head may have a flow path cross-sectional area that is relatively larger than a portion of the mixing tube that receives the gas and the air than the portion of the mixing tube that discharges the gas and the air.

A plurality of ribs in the form of a flat plate having a predetermined thickness are formed radially outward of the burner head and air rising on the outside of the burner head passes through between adjacent two ribs of the plurality of ribs, To the side flame holes.

Wherein the plurality of side flame holes comprises a plurality of relatively low first side flame holes and a plurality of relatively high second side flame holes, wherein at least one of the plurality of first side flame holes comprises a plurality Of the second side flame holes of the second side flame holes.

An intermediate flame hole may be additionally formed between the height of the upper side of the burner head where the first side flame holes are formed and the height of the second side flame holes.

Screw-shaped spiral protrusions each having a predetermined thickness are formed on the inner surface of the mixing tube so that the gas and the air introduced into the inlet of the mixing tube can be mixed with each other while rotating along the spiral projections.

According to another aspect of the present invention, there is provided a cooking machine comprising: a housing in which a cooking cavity in which a cylindrical rice cooker can be arranged is formed of at least one layer and a door capable of opening and closing is provided on each side; A gas burner provided on the bottom of the cooking cavity of the housing to heat the lower surface of the rice cooker; And a gas pipe opened and closed by a gas valve and connected to the gas burner to supply gas to the gas burner.

A throttle having a narrower flow path than the inlet is formed at a position distant from the inlet side of the mixing tube, and a cross-sectional area of the flow path increases as it goes from the throttle to the outlet side so that a part of the gas and air introduced into the inlet of the mixing tube passes through the throttle, The mixing can be performed while the flow rate is decreased due to the volume increase of the flow path. In addition, a swirl chamber having a larger flow path cross-sectional area than the mixing tube is formed at a portion where the burner head and the mixing tube are connected to each other, so that the gas and air remaining in the inlet of the mixing tube pass through the mixing tube, As the flow rate increases due to the volume increase of the flow path, the mixing can be performed. Therefore, the burned gas and the air are homogeneously mixed to reduce the burn-off rate, thereby increasing the overall thermal efficiency.

The swirl chamber inside the burner head is formed so that the upper and lower heights are relatively longer than the width of the left and right air so that the air located at the lower portion of the burner head can be divided into the inside and outside of the burner head and supplied to the upper flame hole and the side flame hole. Accordingly, the external air around the burner head is smoothly supplied to the flame to reduce the burn-off rate, thereby increasing the overall thermal efficiency.

 Further, since the outside of the burner head is formed into a convexly curved surface, air rising on the outside of the burner head can be smoothly supplied to the side flame holes without peeling off. Therefore, the unburned combustion rate can be reduced and the overall thermal efficiency can be improved.

The burner head has a relatively large flow cross-sectional area than the portion where the gas and air are introduced from the mixing tube into the mixing tube and discharges the gas and air so that the pressure and the pressure drop during the flow of gas and air in the burner head And the whole thermal power of the gas burner can be maintained uniformly.

A rib in the form of a flat plate having a certain thickness on the outside of the burner head is formed in a radial shape so that air rising on the outside of the burner head is supplied to the flame in a state where the flow rate is increased while passing between the two ribs, Can be increased. This can reduce the incombustibility of the flame and heat the rice cooker more efficiently.

A first side flame hole having a relatively low height and a second side flame hole having a relatively high height are formed outside the upper portion of the burner head and one first side flame hole is formed between the two second side flame holes, The gas and air in the flame can be discharged at relatively high speed through the first side flame hole having a height lower than that of the second side flame hole having a high height and can be heated with a strong thermal power to the outside of the rice cooker.

An intermediate flame hole is additionally formed between a height at which the first side flame hole is formed and a height at which the second side flame hole is formed in the upper outer side of the burner head so that the first side flame hole and the second side flame space The first side flame hole, the middle flame hole, and the second side flame hole are formed close to each other to generate a flame having one strong thermal power, so that the outer side of the rice cooker can be smoothly It can be heated.

Shaped screw projections having a predetermined thickness are formed on the inner surface of the mixing tube so that the gas and air introduced into the inlet of the mixing tube are mixed with each other while rotating along the spiral projections to improve the mixing performance of the mixing tube. Therefore, it is possible to improve the overall thermal efficiency by reducing the burn-off rate.

1 is a perspective view of the air conditioner according to an embodiment of the present invention.
2 is a perspective view of the gas burner applied to Fig.
3 is a cross-sectional view taken along line A-A 'of the gas burner shown in Fig.
4 is a cross-sectional view taken along line B-B 'of the gas burner shown in Fig.
5 is a top cross-sectional view of the gas burner shown in Fig.
Fig. 6 is a photograph of an actual use of a conventional gas burner and a gas burner according to the present embodiment.
7 is a perspective view of a gas burner according to another embodiment of the present invention.
8 is a cross-sectional view of C-C 'of the gas burner shown in FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted . Embodiments of the present invention relate to a gas burner that effectively heats a large rice cooker to increase thermal efficiency and uniformly heats the bottom surface of a rice cooker, and a cooker to which the same is applied. Hereinafter, such a gas burner is simply referred to as a "gas burner".

1 is a perspective view of the air conditioner according to an embodiment of the present invention. Referring to Fig. 1, the cooker according to the present embodiment is constituted by a housing 1, a gas burner 4, and a gas pipe 6. Specifically, the housing 1 has at least one layer in which a cylindrical rice cooker 2 can be placed, and a door 3 is provided at each side for opening and closing. Here, the gas burner 4 is provided on the bottom of the cooking cavity of the housing 1 to heat the lower surface of the rice cooker 2. A columnar support column 7 is provided at the lower end of the cooking cavity so as to pass through the center of the gas burner 4 to support the lower end of the rice cooker 2 in contact therewith. The gas pipe 6 is opened and closed by the gas valve 5 and is connected to the gas burner 4 to supply the gas to the gas burner 4. [ Specifically, the mixing pipe 100 of the gas burner 4 faces the side wall of the air conditioner, and is supplied with gas by a gas pipe 6 whose opening and closing is controlled by a solenoid type gas valve 5. The gas supply amount may be controlled through a separate control device. Here, the gas is typically a hydrocarbon-based combustion gas such as LPG and LNG.

Particularly, the gas burner 4 can heat the lower surface of the rice cooker 2 evenly in the state where the gas burner 4 has a smaller heating range than that of the conventional gas burner, and the mixing performance is improved to prevent or reduce the combustion, . Hereinafter, the gas burner 4 will be described in detail.

Fig. 2 is a perspective view of the gas burner 4 applied to Fig. 1, Fig. 3 is a cross-sectional view taken along the line A-A 'of the gas burner 4 shown in Fig. 1, 4 is a cross-sectional view taken along the line B-B 'in Fig. 1, and Fig. 5 is a plan sectional view of the gas burner 4 shown in Fig. 2-5, the gas burner 4 according to the present embodiment includes a mixing pipe 100 and a burner head 200 in the form of a donut, which is integrally coupled to an end of the mixing pipe 100.

The mixing pipe 100 is an empty pipe. The throttle 110 having a narrow flow path is formed at a point where gas and air flow through the opened inlet and is spaced apart from the inlet side. As the flow path from the throttle 110 to the outlet The cross-sectional area of the flow path increases. The gas is injected into the inlet of the mixing tube 100, and the air outside the mixing tube 100 flows together with the injection pressure of the gas.

A disc-shaped air damper for adjusting the air flow rate is connected to the inlet of the mixing tube 100, and a gas pipe is inserted so that gas flows into the center of the air damper. The end of the gas pipe is formed with a nozzle through which gas is injected, the nozzle is located inside the mixing pipe 100, and the inflow amount of the gas can be controlled through a separate solenoid type gas valve. The air damper has a slit structure in which the degree of opening is determined while the two original plates having the through holes relatively rotate with each other. With this structure, high-pressure gas is injected from the center of the inlet of the mixing tube 100, and external air is introduced into the opening of the air damper due to the pressure and the kinetic energy.

In the mixing tube 100, a throttle 110 having a particularly narrow flow path is formed between the inlet and the outlet. The flow path of the mixing tube 100 narrows to the throttle 110 which is a predetermined distance from the inlet and gradually increases again as it goes from the throttle 110 to the outlet of the mixing tube 100. As a result, some of the gas and air introduced into the inlet of the mixing tube 100 flow through the throttle 110 of the mixing tube 100 to the outlet of the mixing tube 100, Mixing is achieved.

The burner head 200 is a ring-shaped tube with an empty interior. The burner head 200 is connected to the outlet of the mixing tube 100 and is supplied with gas and air. The outlet of the mixing tube 100 is integrally coupled to the burner head 200 in the form of a donut so that the fluid from the mixing tube 100 can be circulated clockwise or counter clockwise through the burner head 200 As shown in Fig. For example, the gas burner 4 may have an overall shape such as " 9 " when seen from the bottom. Accordingly, the mixed gas passing through the mixing tube 100 is discharged along the inner tube of the curved burner head 200 to the outside.

Particularly, in the burner head 200, a swirling chamber S having a larger flow passage cross-sectional area than the mixing pipe 100 is formed at a portion connected to the mixing pipe 100. The swirling chamber S is a space in which gas and air introduced from the mixing tube 100 are mixed with each other by inducing or forming a vortex while the flow velocity is reduced. The inner wall of the swirling chamber S may be formed in such a structure as to swell the volume gently with a curved surface continuous with the mixing tube 100 or to form a step with the boundary of the mixing tube 100 to swell the volume rapidly. Or a vortex for vortex formation in the swirling chamber (S).

Conventional gas burners have a structure in which a burner head having a donut shape, which is the same as a venturi type mixing tube, is combined, and gas and air have to be mixed only in the mixing tube. Basically, the inlet of the mixing tube is a structure in which air is introduced by the injection pressure of the gas, but it is difficult to mix them all in the mixing tube. If the length of the mixing tube is sufficient, the mixing performance can be further improved. However, since the size of the gas phase in which the gas burner is installed must also be increased, there is a limit in extending the mixing tube length. In addition, there is a method of increasing the sectional area difference between the throttle and the outlet of the mixing tube. However, since the outlet of the mixing tube is determined by the size of the burner head, the cross sectional area of the throttle must be reduced. This also has its limitations in terms of degradation. Therefore, the conventional gas burner has a problem that the thermal efficiency is lowered due to the incomplete combustion of the gas and the harmful products such as carbon monoxide are discharged.

In view of this point, in this embodiment, in order to mix the gas and air introduced into the mixing tube 100 into the burner head 200 in addition to the mixing tube 100, Thereby forming a seal (S). The remaining air and gas that are not mixed in the mixing pipe 100 among the air and gas flowing into the mixing pipe 100 flow into the swirling chamber S of the burner head 200 through the mixing pipe 100, The flow rate is decreased due to the increase of the volume, so that the homogeneity can be improved.

At the upper portion of the burner head 200, a plurality of upper flame holes 210 and a plurality of side flame holes 220, each of which generates a flame outwardly, are formed. Therefore, after the air and gas introduced from the mixing pipe 100 are mixed with each other, they are discharged through the upper flame hole 210 and the side flame hole 220, and the upper flame hole 210 and the side flame hole 220, The flame is generated by the ignition means provided adjacent to the outlet of the burner. Here, the ignition means is a known device for generating an instantaneous spark through the electric energy supplied from the outside, and a detailed description will be omitted below.

The upper flame hole 210 is a hole penetrating the upper surface of the burner head 200 in the vertical direction, and the direction of the flame is directed to the upper portion of the burner head 200. The side flame holes 220 are formed with through holes spaced along the upper outer periphery of the burner head 200 at regular intervals. Here, the side flame holes 220 may be formed at different heights of adjacent two side flame holes 220 as shown in FIG.

The plurality of side flame holes 220 includes a plurality of relatively low first side flame holes 221 and a plurality of relatively high second side flame holes 222. Thus, the gas and air in the burner head 200 are discharged at relatively high speed through the first side flame holes 221, which are lower in height than the second side flame holes 222 having a high height, It can be heated by fire power. In particular, at least one of the plurality of first side flame holes 221 is formed between adjacent two second side flame holes 222 of the plurality of second side flame holes 222 to form one first side flame hole 222 221) have the same effect on the adjacent two second side flame holes (222).

The cooking machine used for large-scale rice cooking such as a meal restaurant or a restaurant uses a large sized rice cooker, which requires a strong thermal power to heat the rice cooker. The gas burner basically has a ring shape. In the conventional gas burner, only the upper flame ball is formed, and in order to heat the outer portion of the rice cooker, the size thereof is also increased in proportion to the rice cooker. However, as the gas burner becomes larger, the central portion of the rice cooker does not reach the flame to heat the rice cooker. In view of this point, the present embodiment can uniformly heat the rice cooker from the center of the rice cooker to the outside of the rice cooker by allowing the thermal power to be generated upwardly and side-by-side on the burner head 200 at the same time.

As shown in FIGS. 2-5, two upper flame holes 210 may be formed adjacent to each other, and a square flute 211 may be formed in each 120-degree interval without the upper flame hole 210. The rectangular projections 211 serve as passages for communicating the air on the outside and the inside of the burner head 200 and can supply the unburned air to the side flame holes 220 inside the burner head 200.

The swirling chamber S in the burner head 200 is formed to have a relatively longer height h than the width W so that the air located in the lower portion of the burner head 200 is heated from the inside of the burner head 200 The rising air Ai is separated from the air Ao rising from the outside of the burner head 200 and the air Ai rising from the inside of the burner head 200 located below the burner head 200, And the air Ao rising from the outside of the burner head 200 located at the lower portion of the burner head 200 is supplied to the side flame holes 220. [

The thermal efficiency of the burner head has a great influence depending on whether or not the outside air of the burner head can be smoothly supplied by the flame. The conventional burner head does not need to take into consideration the shape of the burner head especially since a flame is generated only on either the top or the side. In addition, there is a conventional burner head having a bent or angled portion on the outer surface of the burner head, which may lead to peeling of air and difficulty in smoothly supplying oxygen to the flame.

The height H of the upper and lower portions of the swirling chamber S is set to be longer than the width W of the swirling chamber S in the shape of the swirling chamber S in the burner head 200, So that the air is supplied to the upper flame hole 210 and the side flame hole 220, respectively. In this case, air (Ao) rising from the outside of the burner head (200) rides on the curved outer side of the burner head (200) And can be smoothly supplied to the side flame holes 220.

The gas and air flowing into the burner head 200 through the mixing tube 100 are mixed with each other and flow along the burner head 200. At this time, since the gas flows to the upper flame hole 210 and the side flame holes 220, the pressure gradually decreases as the gas flows along the burner head 200. The conventional gas burner has a phenomenon that the flow area of the burner head is constant and the intensity of the flame ejected from the flame hole of the burner head is uneven. The rice cooker placed on the top of the gas burner causes the base plate to be heated unevenly Respectively.

In consideration of this point, the burner head 200 according to the present embodiment has a relatively large flow cross-sectional area than the portion where gas and air are introduced into the mixing pipe 100 from the mixing pipe 100, The pressure drop which is lowered in the process of the gas and air getting on the burner head 200 can be compensated by the volume reduction. For example, the flow path of the burner head 200 can be narrowed in a clockwise or counterclockwise direction along a ring-shaped pipe of the burner head 200 at a portion connected to the mixing pipe 100, As shown in FIGS. 2-5, the cross section may be the same from the inlet of the burner head 200 to a certain point, and the cross section may decrease from any point to the outlet. The point at which the flow path begins to narrow can be an experimentally determined position in which the flame is found to be abruptly weakened when the flow path of the burner head 200 is uniform. Accordingly, even if the mixed gas is discharged from the inlet to the outlet of the burner head 200, the flow rate and pressure are maintained due to the reduction of the flow passage area itself, so that the thermal power of the burner head 200 can be made uniform as a whole.

Korean Patent No. 10-0841430 discloses a gas burner having a high-burning double burner head, in which two annular burner heads are formed inside and outside. Since the flame is generated in the upper and lower directions and the burner head is formed in the upper and lower directions, the burner head is arranged at the lower side of the rice cooker There is a limit to increase in proportion to the area. Korean Patent No. 10-0495670 '' Commercial gas cooker burner '' has a structure in which a dike is formed in each of an outer ridge and an inner ridge of a disc-shaped burner head. This can heat both the bottom surface and the outer surface of the rice cooker in one burner head, but there is a limit in that the burner head is increased in proportion to the bottom surface area of the rice cooker in that the flame is generated in the vertical direction. Further, as the thickness of the burner head is constant and the distance from the part where the burner head and the mixing tube are connected is distant from each other, the intensity of the flame weakens, and the rice cooker is heated unevenly.

This embodiment differs from the prior art in that a swirling chamber S having a wider volume than the mixing tube 100 is formed inside the burner head 200 so that the uncombined gas and air in the mixing tube 100 So that the thermal efficiency is increased as compared with the prior art. In addition, the present embodiment can simultaneously generate flames in the upward direction and the lateral direction, and can heat up to a wider range than in the past, thereby enabling miniaturization, so that the entire heating can be performed from the central portion to the outer portion of the rice cooker bottom surface.

Fig. 6 is a photograph of an actual use of a conventional gas burner and a gas burner according to the present embodiment. Fig. 6 (a) is a conventional gas burner, and Fig. 6 (b) is a gas burner according to the present embodiment. The following table is experimental data comparing the thermal efficiency between the conventional gas burner and the gas burner of this embodiment. The cooking time and the consumption of gas per hour consumed until the completion of the cooking were measured based on the rice cookers of 20, 30, 40, and 50 persons commonly used in a general restaurant. As a result of the experiment, it was confirmed that the cooking time can be shortened by about 2 to 3 minutes as a whole and that the heat efficiency is increased by about 20% or more.

Comparative Example Example Cooking time 50 Players About 34 minutes About 35 minutes For 40 people About 34 minutes About 33 minutes 30 Players Approximately 32 minutes About 30 minutes 20 Players About 31 minutes Approximately 28 minutes Gas consumption 26.2 kW (22, 530 kcal / h) 33.7 kW (29, 000 kcal / h)

Conventional gas burners have a structure in which a venturi type mixing tube is coupled to a ring-shaped burner head having a constant cross-sectional area of a flow path, and the mixed gas flows into a sieve burner head in which gas and air are not sufficiently mixed. On the other hand, the present embodiment can be mixed in the swirling chamber S inside the burner head 200 even if there is gas and air which are not mixed in the mixing tube, thereby generating a homogeneous mixed gas as a whole. In addition, since the side flame holes are formed in addition to the top flame holes, air rising on the outside of the burner head can be easily supplied to the flame, thereby reducing the unburned combustion. As a result, The cooking time can be shortened and the heat efficiency can be increased by about 20% or more.

As shown in FIG. 6, the gas burner installed in the conventional cooking machine is formed such that the flame having the upper and lower through-going directions is ignited while the gas is emitted and the flame direction is generally directed upward as shown in FIG. 6 (a). Since the local heating is performed on the lower surface of the rice cooker, the size of the gas burner must be increased to heat the outer portion of the rice cooker. As a result, the central portion of the gas burner, i.e., there was. This was caused by the problem of the rice in the central portion of the rice cooker being used as the three-layered rice or the steamed rice. In order to compensate for this problem, a structure in which the gas burner was installed as a concentric circle was developed. However, It takes a lot of space in the half period, installation and maintenance are not easy, and the manufacturing cost of the gas burner is increased.

On the other hand, in the gas burner according to the present embodiment, as shown in FIG. 6 (b), sparks are formed both upwardly and side-by-side of the gas burner. This is because even if the donut diameter of the gas burner is small, the flame spreads to the outer portion of the rice cooker, so that the lower surface of the rice cooker can be uniformly heated. Further, the gas burner can be downsized and the inflow of outside air is facilitated, so that the thermal efficiency can be increased.

FIG. 7 is a perspective view of a gas burner according to another embodiment of the present invention, and FIG. 8 is a cross-sectional view of C-C 'of the gas burner shown in FIG. 7-8, the gas burner according to the present embodiment includes a mixing pipe 100 and an annular burner head 200 integrally coupled to an end of the mixing pipe 100. In particular, the burner head 200 A plurality of ribs 230 formed in a plate shape on the outer surface of the mixing tube 100 are formed in a radial shape and an intermediate flame hole 223 is additionally formed, Respectively. The basic structure of the mixing tube 100 and the burner head 200 is the same as the above description of the embodiment shown in Figs. 2-5, and therefore the following description focuses on the constitution that differs from the embodiment of Figs. 2-5 .

In this embodiment, a plurality of ribs 230 in the form of a flat plate having a certain thickness may be radially formed on the outer side of the burner head 200. As a result, the air rising on the outside of the burner head 200 is supplied to the side flame holes 220 while the flow rate of the air passes between the adjacent two ribs 230 among the plurality of ribs 230. The present embodiment is similar to the embodiment shown in FIGS. 1-4 except that the external air flows into the side flame hole 220 of the burner head 200 through the outer surface of the burner head 200, The side flame width of the side flame holes 220 is increased as the width of the side flame holes 220 becomes closer to the side flame holes 220 of the burner head 200. As a result, That is, the rib 230 serves as a guide so that external air is concentrated on the side flame holes 220. As a result, this embodiment can increase the thermal power of the side flame holes 220 so that the lower surface of the rice cooker which is placed on top of the gas burner 4 can be heated more widely.

In this embodiment, an intermediate flame hole 223 is further formed between the height of the upper side of the burner head 200 where the first side flame hole 221 is formed and the height of the second side flame hole 222 . The intermediate flame hole 223 is a through hole formed between the first side flame hole 221 and the second side flame hole 222, which are different in height in the embodiment shown in Figs. 2-5. Due to the height difference between the first side flame holes 221 and the second side flame holes 222, relatively high pressure gas and air are discharged into the first side flame holes 221, and relatively low pressure gas and air Is discharged to the second side flame hole 222. [ This may cause a difference in the strength of firepower caused by the pressure difference, resulting in vibration or noise. The intermediate flame hole 223 is additionally formed between the first side flame hole 221 and the second side flame hole 222 to reduce the difference in the thermal power and to attenuate vibration or noise. The formation of the intermediate flame hole 223 allows the first side flame hole 221 and the second side flame hole 222 to be located very close to each other to form one strong flame, It can be heated smoothly. The position of the intermediate flame hole 223 may be located at the center point of the triangle formed by one first side flame hole 221 and two second side flame holes 222 as shown in FIG. .

In this embodiment, a screw-shaped spiral protrusion 120 having a predetermined thickness may be formed on the inner surface of the mixing tube 100. The spiral protrusion 120 is a guide protruding at a predetermined height in the form of a screw on the inner surface of the mixing tube 100. The gas and air introduced into the mixing tube 100 are rotated around the spiral protrusion 120, . The spiral protrusion 120 may be formed to flow air in a clockwise or counterclockwise direction from the throttle 110 of the mixing tube 100 toward the outlet. By forming the spiral protrusion 120 inside the pipe-shaped mixing pipe 100, mixing performance of gas and air can be improved and incomplete combustion can be prevented, so that the thermal efficiency can be finally increased.

The present invention has been described above with reference to preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

1 ... housing 2 ... rice cooker
3 ... door 4 ... gas burner
5 ... gas valve 6 ... gas pipe
7 ... bearing column
100 ... Mixing pipe 110 ... Throttle part
120 ... spiral projection
200 ... Burner head S ... Swirl chamber
210 ... upper flame ball 211 ... square flap
220 ... side flame ball 221 ... first side flame ball
222 ... 2nd side flame ball 223 ... middle flame ball
230 ... rib

Claims (9)

A throttle 110 having a narrower flow path than the inlet is formed at a point where gas and air are introduced through the opened inlet and is spaced apart from the inlet side, and as it goes from the throttle 110 to the outlet side A mixing pipe (100) in which the cross-sectional area of the flow path is increased; And
The mixing tube 100 is connected to the outlet of the mixing tube 100 and is supplied with the gas and air and is connected to the mixing tube 100. The mixing tube 100 is connected to an outlet of the mixing tube 100, A swirling chamber S having a cross-sectional area is formed, and a plurality of upper flame holes 210 and a plurality of side flame holes 220, each of which generates a flame outwardly, Head 200,
Part of the gas and air introduced into the inlet of the mixing pipe 100 flows into the outlet of the mixing pipe 100 through the throttle 110 of the mixing pipe 100, The mixing is carried out,
The gas introduced into the inlet of the mixing pipe 100 and the rest of the air flow into the swirling chamber S of the burner head 200 through the mixing pipe 100, Mixing is performed while decreasing,
The swirling chamber S in the burner head 200 is formed to have a relatively longer height h than a width W of the burner head 200. When the air located below the burner head 200 rises, (Ai) rising from the inside of the burner head (200) and air (Ao) rising from the outside of the burner head (200)
Air Ai rising from the inside of the burner head 200 in the air located below the burner head 200 is supplied to the upper flame hole 210 and air The air Ao rising from the outside of the burner head 200 is supplied to the side flame holes 220,
The outer side of the burner head 200 is formed into a convexly curved surface so that the air Ao rising from the outside of the burner head 200 rises along the curvature outer side of the burner head 200, Is supplied to the ball 220,
The mixing tube 100 is formed with screw-shaped spiral projections 120 having a predetermined thickness on the inner surface of the mixing tube 100. The gas and the air introduced into the inlet of the mixing tube 100 pass through the spiral projections 120 ) Of the gas burner. delete delete The method according to claim 1,
The burner head 200 includes a gas burner 200 having a relatively large flow cross-sectional area than a portion of the mixing tube 100 through which the gas and the air are introduced into the mixing tube 100, . The method according to claim 1,
A plurality of ribs 230 in the form of a flat plate having a predetermined thickness are radially formed on the outer side of the burner head 200. Air rising on the outside of the burner head 200 flows through the plurality of ribs 230) is supplied to the side flame holes (220) while passing through between adjacent two ribs (230). The method according to claim 1,
The plurality of side flame holes 220 include a plurality of relatively low first side flame holes 221 and a plurality of relatively high second side flame holes 222,
Wherein at least one of the plurality of first side flame holes (221) is formed between adjacent two second side flame holes (222) of the plurality of second side flame holes (222). The method according to claim 6,
An intermediate flame hole 223 is additionally formed between the height of the upper side of the burner head 200 at which the first side flame hole 221 is formed and the height at which the second side flame hole 222 is formed. delete A housing 1 in which a rice cooking cavity 2 in which a columnar rice cooker 2 can be placed is formed in at least one layer and a door capable of opening and closing is provided on each side;
A gas burner (4) provided on the bottom of the cooking cavity of the housing (1) to heat the lower surface of the rice cooker (2); And
And a gas pipe (6) opened and closed by a gas valve (5) and connected to the gas burner (4) to supply gas to the gas burner (4).

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