JP2008249205A - Gas kitchen range - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas kitchen range, effectively utilizing heat of discharged exhaust gas in discharging high-temperature exhaust gas generated in a combustion chamber through an exhaust gas duct. <P>SOLUTION: In this gas kitchen range, the combustion chamber 3 having a combustion gas burner 2 is disposed in a body casing 1, the exhaust gas duct 4 for discharging exhaust gas from the combustion chamber 3 is provided extending from the combustion chamber 3 to the outside of the body casing 1, and a heat ring 5 for blocking an upper end opening of the combustion chamber 3 in placing a cooking pot N on the range is provided on the upper end of the combustion chamber 3. The range is provided with a water supply pipe 9 for supplying water from a water source to the cooking pot N placed on the heat ring 5, and a part of the water supply pipe 9 is disposed as a heat exchange part 90 in the exhaust gas duct 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas low range (gas stove) in which a combustion gas such as city gas is burned and used as a heat source for cooking.

  Conventionally, a gas low range in which a combustion gas such as city gas is burned and used as a heat source for cooking is generally used. In this conventional gas low range, a combustion gas burner is provided in a main body casing, a virtues are provided above the combustion gas burner, and a cooking pan such as a small-sized pan is placed on the virtues to perform heating cooking.

  Gotoku is composed of a plurality of claws arranged at intervals in the circumferential direction. A cooking pan is placed on the upper surface of the claws, and the flame of the combustion gas burner is applied to the bottom of the pan and heated, and acts on the bottom of the pan. Hot exhaust gas is discharged from between the five virtue claws to the surroundings to heat the entire side of the cooking pan.

  In such a gas low range, the hot exhaust gas is discharged around the cooking pan. Therefore, if the gas low range is installed in close contact with the wall surface of the room or close to the wall surface, the exhaust gas having a high temperature on the wall surface. The gas low range could not be installed in close contact with or in close proximity to the wall surface because it could be damaged by heating.

Therefore, in order to prevent high-temperature exhaust gas from being discharged to the surroundings, there has been considered one in which a heat ring is provided instead of the above five virtues composed of a plurality of claws (see, for example, Patent Document 1). This is because a substantially annular heat ring is provided at the upper end of the substantially cylindrical combustion chamber side wall, and when the cooking pan is placed on the heat ring, the entire circumference of the heat ring and the bottom of the pan come into contact with each other. The opening is closed so that the exhaust gas is not discharged around the cooking pan. An exhaust port is formed at the rear part of the side wall of the combustion chamber, and an exhaust flue is connected to the exhaust port. Exhaust gas generated in the combustion chamber is exhausted through the exhaust flue. .
JP 7-318064 A

  By the way, in the conventional gas low range provided with such a heat ring, the high-temperature exhaust gas generated in the combustion chamber is discharged through the exhaust flue as described above. The exhaust gas exhausted through the exhaust gas is exhausted at a high temperature, the heat escapes and is not used effectively, and there is a lot of waste and the surroundings of the gas low range become high temperature.

  The present invention has been made in view of the above points, and an object of the present invention is to effectively use the heat of exhaust gas discharged when exhausting hot exhaust gas generated in a combustion chamber through an exhaust flue. The object is to provide a gas low range that can be used.

  In order to solve the above-mentioned problem, the invention according to claim 1 arranges a combustion chamber 3 having a combustion gas burner 2 in the main body casing 1 and combusts an exhaust flue 4 for discharging exhaust gas from the combustion chamber 3. Placed on the heat ring 5 in the gas low range provided at the upper end of the combustion chamber 3 provided from the chamber 3 to the outside of the main casing 1 and closing the upper end opening of the combustion chamber 3 when the cooking pan N is placed. The water supply pipe 9 for supplying water from the water source to the cooking pan N placed is provided, and the exhaust gas passing through the exhaust flue 4 or passing through the exhaust flue 4 is provided with a part of the water supply pipe 9 as a heat exchange unit 90. It is characterized by being arranged in the discharge opening 80 to be discharged.

  By adopting such a configuration, it is possible to save energy and shorten the heating time by recovering and effectively using the exhaust heat of the exhaust gas.

  The invention according to claim 2 is the invention according to claim 1, wherein the air flow path cylinder portion 7 having the exhaust flue 4 inside is projected upward from the rear portion of the main body casing 1, and the air flow path cylinder portion A discharge opening 80 through which exhaust gas is discharged is disposed at the upper end of the air flow passage 7, and a water supply pipe 9 is disposed on the outer surface of the air flow path cylinder portion 7 so as to pass near the discharge opening 80. A portion passing through the vicinity of the discharge opening 80 is constituted by a heat transfer pipe 9a as a heat exchange section 90, and connecting portions of the heat transfer pipe 9a on the upstream side and downstream side of the water supply pipe 9 are connected by a universal joint 94. It is characterized by comprising.

  When heat cooking is performed by the combustion gas burner 2 without supplying water through the water supply pipe 9, if the heat exchanging unit 90 is located in the exhaust flue 4 through which the high-temperature exhaust gas passes, the heat exchanging unit 90 is heated. Since the target water is not flowing, the heat transfer tube 9a of the heat exchange section 90 may be damaged by the high-temperature exhaust gas. However, a universal joint 94 is provided before and after the heat transfer tube 9a so that the heat transfer tube 9a can be moved. Thus, the heat transfer tube 9a can be pulled out from the discharge opening 80 to prevent damage due to high-temperature exhaust gas.

  In the present invention, the heat exchange part of the water supply pipe is arranged in the exhaust flue through which the high-temperature exhaust gas passes, and the exhaust heat of the exhaust gas is recovered and effectively used, thereby achieving energy saving and heating. The time can be shortened.

  Hereinafter, the gas low range (gas stove) of this invention is demonstrated based on embodiment shown to drawing. 1 is a front view of the gas low range, FIG. 2 is a perspective view, FIG. 4A is a perspective view of the gas low range, FIG. 4B is a plan view of the gas low range, FIG. 5 is a side view of the same, and FIG. FIG. 7 is a perspective view of a state where the cooking pan is placed.

  As shown in FIGS. 1 to 7 and the like, the gas low range is provided with a combustion chamber 3 in which a combustion gas burner 2 is accommodated in a main casing 1 serving as an outer shell, and an exhaust flue described later at the rear end of the main casing 1. The main body is formed by projecting an air flow path cylinder portion 7 in which 4 is accommodated.

  The main body casing 1 is configured by joining a front plate part 11, side plate parts 12 on both sides, a back plate part 13 and a top plate part 14 into a rectangular box shape (but no bottom plate) by welding or the like. In addition, each plate portion is formed of a metal such as SUS (for example, SUS430). Further, leg portions 15 project from the lower end portions of the front plate portion 11, the side plate portion 12, and the back plate portion 13, and the front plate portion 11, the side plate portion 12, A lower end portion of the back plate portion 13 is disposed. In the present embodiment, the main body casing 1 is formed to have a width of 600 mm, a depth of 750 mm, a height of the leg portion 15 of 140 mm, and a height of 420 mm up to the top surface of the top plate portion 14. In this gas low range, the back plate portion 13 is installed in close contact with or along the wall surface of the room, and the front plate portion 11 side is the front and the back plate portion 13 side is the rear. And the one part or all part of the surface of the main body casing 1 is made into the double structure in which the air for cooling flows inside, and in this embodiment, the top-plate part 14 and the side-plate part 12 have a double structure. .

  The top plate portion 14 has a double structure comprising an upper top plate 14a and a lower top plate 14b disposed with a gap below a substantially first half of the upper top plate 14a. A substantially circular opening 14c penetrating vertically is formed in a portion where the combustion chamber 3 is disposed. More specifically, as will be described later, the combustion chamber 3 is a space surrounded by a substantially cylindrical side wall 31, and the substantially cylindrical side wall 31 is located in the substantially circular opening 14 c at a substantially central portion of the upper top plate 14 a. It is arrange | positioned in the state penetrated by. The lower top plate 14 b is provided on the front side of the side wall 31 of the combustion chamber 3, and a portion between the upper top plate 14 a and the lower top plate 14 b in the front half of the top plate portion 14 cools the top plate portion 14. A space 62 is formed. Further, the space 63 in the main body casing 1 (except for the combustion space 30 and the cooling space 62 in the combustion chamber 3; the same applies hereinafter) and the top plate portion 14 are provided between the partition portion 14d and the side wall 31 of the combustion chamber 3. The communication passage 14e communicates with the upper atmosphere. Further, a front opening 14f for communicating the upper and lower spaces of the lower top plate 14b is formed at the front end portion of the lower top plate 14b, and the cooling space 62 on the upper side of the lower top plate 14b and the inner casing 1 on the lower side are formed. The space 63 communicates with the front opening 14f.

  The front plate portion 11 is provided with an operation portion 17 for igniting the combustion gas burner 2, adjusting the thermal power, and extinguishing the fire, and the user can operate the operation portion 17 from the front side of the main casing 1. Further, the front plate portion 11 is formed with an air intake hole 11a for taking air into the space 63 in the main body casing 1 from the outside of the main body casing 1, and visually confirms the combustion state of the combustion gas burner 2 in the combustion chamber 3. A viewing window 11b is opened. A viewing opening 35 is formed in a portion of the side wall 31 of the combustion chamber 3 corresponding to the viewing window 11b.

  The side plate portion 12 has a double structure consisting of an outer plate 12a and an inner plate 12b disposed inside the outer plate 12a via a gap, and between the outer plate 12a and the inner plate 12b. The gap serves as a ventilation path 61 through which cooling air passes, and an opening between the lower end of the outer plate 12a and the lower end of the inner plate 12b takes air from outside the main casing 1 as cooling air into the ventilation path 61. The intake 12d is for this purpose. The inner plate 12b has a through hole 12e formed in a portion corresponding to the cooling space 62 near the upper end of the front half, and has passed through the air passage 61 between the outer plate 12a and the inner plate 12b from below. Cooling air flows into the cooling space 62 from the through hole 12e. Further, the inner plate 12b has a lower through hole 12f formed below the portion where the through hole 12e is formed, and a part of the cooling air that has passed through the air passage 61 is formed in the main body from the lower through hole 12f. It flows into the space 63 in the casing 1.

  The back plate portion 13 has left and right end portions joined to the rear end portions of the both side plate portions 12, respectively. The front plate portion 11, both side plate portions 12, the back plate portion 13, and the top plate portion 14 as described above. The main casing 1 is constituted by the above. Moreover, in this embodiment, the juice receiver 16 is arrange | positioned between the leg parts 15 on the right and left sides of the lower end part of the main body casing 1. Further, an air flow path cylinder portion 7 in which the exhaust cylinder portion 40 is accommodated is protruded upward from the rear end portion of the top plate portion 14, and this will be described later.

  A combustion chamber 3 is disposed in the main body casing 1. In the combustion chamber 3, the inside surrounded by the side wall 31 becomes the combustion space 30. In this embodiment, the side wall 31 is made of a metal such as a substantially cylindrical SUS (for example, SUS430). The lower end of the side wall 31 of the combustion chamber 3 is opened to form a lower end opening 31a, and the combustion space 30 in the combustion chamber 3 communicates with the space 63 in the main casing 1 through the lower end opening 31a. Thus, secondary air when the combustion gas burner 2 burns flows into the combustion chamber 3 from the lower end opening 31a. In the present embodiment, a bottom plate 36 is provided at the lower end of the side wall 31, and a lower portion of the combustion gas burner 2 of the bottom plate 39 is opened to form a lower end opening 31a. A combustion gas burner 2 is disposed in the combustion chamber 3. In this embodiment, the combustion part 21 of the combustion gas burner 2 is disposed in the vicinity of the lower end of the combustion chamber 3 and the mixing tube 22 is below the combustion chamber 3 (that is, below the lower end of the side wall 31 of the combustion chamber 3). However, if at least the combustion section 21 is located in the combustion chamber 3 (that is, above the lower end of the side wall 31 of the combustion chamber 3), the exhaust gas generated in the combustion chamber 3 Since it is not discharged | emitted from the lower end opening 31a, it does not matter. Further, the main body casing 1 is provided so as to expose a pipe connection port 18 to which a downstream end of a gas supply pipe (not shown) made of a rubber hose or the like is exposed. 22 is connected by a gas supply pipe (not shown).

  In the combustion chamber 3, a seed fire burner 23 is disposed in the vicinity of the combustion part 21 of the combustion gas burner 2. The seed fire burner 23 is provided with a heat sensitive part composed of a thermocouple or the like. When the operation part 17 is operated to perform an ignition operation, the seed fire burner 23 is ignited by the piezoelectric spark, and the heat sensitive part is sufficiently heated. When a temperature higher than a predetermined temperature is sensed, the gas supply path to the combustion gas burner 2 is opened to supply gas, and the combustion gas burner 2 is ignited to start combustion. Further, when the flame disappears, a temperature higher than a predetermined temperature is not detected by the heat sensitive part, the gas supply path is closed, and combustion is stopped.

  A heat ring 5 is provided at the upper end of the side wall 31 of the combustion chamber 3. The heat ring 5 is made of metal such as SUS (for example, SUS 304), and the upper surface is a flat surface. A cooking pot is placed on this surface, and the horizontal direction of the heat ring 5 is shown in FIG. Is longer than the width (thickness) of the side wall 31 of the combustion chamber 3, and an arc-shaped misalignment prevention plate 51 protruding from the lower surface of the heat ring 5 is brought into contact with the inner surface of the side wall 31 of the combustion chamber 3 to heat. Positioning with respect to the side wall 31 of the ring 5 is performed. Thereby, the heat ring 5 will be in the state protruded inward and outward of the thickness direction of the side wall 31, and the protrusion length to the inner side will be 5-10 mm. The portion provided with the heat ring 5 at the upper end of the side wall 31 of the combustion chamber 3 is located on the upper side of the top plate part 14 (upper side of the upper top plate 14 a), and the cooking pan was placed on the heat ring 5. Sometimes the bottom of the pan does not contact the top plate portion 14. When the cooking pan is placed on the heat ring 5, the upper end opening 31b of the side wall 31 of the combustion chamber 3 is closed by the cooking pan.

  In this embodiment, a heat shield plate 33 is disposed along the inner peripheral surface of the front portion of the side wall 31 of the combustion chamber 3. The side wall 31 of the combustion chamber 3 is heated by the radiation of the flame of the combustion gas burner 2 provided inside the combustion chamber 3 and becomes high temperature. In particular, the front portion of the side wall 31 of the combustion chamber 3 becomes high temperature, so that the top plate portion The first half of the top plate 14 becomes hot, and the first half of the top plate 14 is easy for the user to touch, so that the user may accidentally touch and burn, or the top plate located when the user cooks Since the temperature (air temperature) in front of the portion 14 becomes high, a heat shield plate 33 is provided to prevent this.

  The heat shield plate 33 is formed of a metal such as SUS and has a substantially plate shape with a thickness of 2 to 3 mm. The front surface of the side wall 31 of the combustion chamber 3 in a plan view (180 to 220 degrees as a central angle). The upper and lower sides are formed in a length extending from the heat ring 5 at the upper end of the side wall 31 to the lower end of the side wall 31. The heat shield plate 33 is fixed by welding or the like to a portion protruding from the inner peripheral surface of the side wall 31 to the inside of the side wall 31 of the heat ring 5 through a gap 34 of 5 to 10 mm. Y in FIG. 4 indicates a welded portion. Increasing the distance from the inner peripheral surface of the side wall 31 of the heat shield plate 33 increases the width of the gap 34 and improves the air permeability and the cooling performance by the air flow. However, the distance from the inner peripheral surface of the side wall 31 is 10 mm or more. Then, the heat shield plate 33 is positioned on the inner side of the inner edge of the heat ring 5, and the area of the opening in the heat ring 5 is reduced, and the cooking pan N placed on the heat ring 5 is reduced. This is not preferable because the effective area for heating the bottom surface becomes narrow and the heating efficiency decreases.

  A discharge port 32 for discharging exhaust gas generated in the combustion chamber 3 is formed in the rear part of the side wall 31 of the combustion chamber 3, and an exhaust pipe whose inside becomes the exhaust flue 4 is formed in the discharge port 32. The front end of the part 40 is connected. The exhaust cylinder part 40 is accommodated in the air flow path cylinder part 7 protruding upward from the top plate part 14, and the air flow path cylinder part 7 and the exhaust cylinder part 40 will be described below.

  The air flow path cylinder portion 7 has a substantially rectangular tube shape protruding upward from the vicinity of the rear end portion of the top plate portion 14 (upper top plate 14a), and the air flow path cylinder portion 7 of the upper top plate 14a protrudes. The open portion is open, and the space 63 in the main body casing 1 on the lower side of the upper top plate 14 a communicates with the space in the upper air flow path cylinder portion 7 through the communication port 70. In the present embodiment, a lower opening 71 is formed at the lower end of the rear end surface of the air flow path cylinder portion 7 so that the space in the air flow path cylinder portion 7 communicates with the atmosphere. When cooling air is flowing through the space, air further flows in from the lower opening 71. In addition, an opening 72a is formed in the center of the top surface 72 of the air flow path cylinder portion 7 through which the exhaust cylinder portion 40 of the exhaust flue 4 and the drift portion 8 described later are inserted, and slits 72b are formed on both sides thereof. Therefore, the inside of the air flow path cylinder portion 7 communicates with the atmosphere. Further, the back surface of the air flow path cylinder portion 7 is formed by a double plate 73 composed of an outer plate 73a and an inner plate 73b, and the opening at the lower end and the opening at the upper end in the double plate 73 are air (cooling air). And an air flow path 65 between them. Reference numeral 74 in the drawing denotes a presser claw of the exhaust cylinder part 40 that protrudes from the air flow path cylinder part 7.

  The exhaust cylinder part 40 extends from the side wall 31 of the combustion chamber 3 to the vicinity of the horizontal cylinder part 41 protruding substantially horizontally toward the rear of the space 63 in the main body casing 1 and the back plate part 13 of the horizontal cylinder part 41. And a vertical tube portion 42 having a substantially rectangular tube shape protruding upward from the rear end portion. The upper part of the vertical cylinder part 42 from the top plate part 14 is accommodated in the air channel cylinder part 7, and the upper end opening 43 of the vertical cylinder part 42 described in detail later is the upper end of the air channel cylinder part 7. It is located near the slit 72b and communicates with the atmosphere. That is, the space in the combustion chamber 3 and the atmosphere communicate with each other through the space in the exhaust cylinder portion 40, and the space in the air flow path cylinder portion 7 (except for the space in the exhaust cylinder portion 40, A space 63 in the main casing 1 and the atmosphere communicate with each other by a cooling flow path 64) which will be described later. Further, a heat insulating material 44 made of a gypsum board or a glass wool molding material is provided on the outer surface of the exhaust tube portion 40.

  Thus, the surface of the portion of the exhaust flue 4 located outside the main body casing 1 has a double structure in which the outside is the air flow path cylinder portion 7 and the inside is the exhaust cylinder portion 40 through a gap of about 10 mm, that is, The inner flow path (that is, the flow path in the exhaust cylinder portion 40) becomes the exhaust flue 4, and the outer flow path (that is, the flow path outside the exhaust cylinder portion 40 and inside the air flow path cylinder portion 7). Is a cooling flow path 64 through which cooling air flows, and high-temperature exhaust gas that has flowed through the exhaust flue 4 is discharged from a discharge opening 80 of a drift portion 8 to be described later. Moreover, although mentioned later, the heat exchange part 90 of the water supply pipe | tube 9 of this invention is arrange | positioned at the discharge opening 80. FIG.

  A drift portion 8 is provided at the upper end portion of the air flow path cylinder portion 7. The drifting portion 8 flows through the exhaust cylinder portion 40 and is discharged above the upper end opening 43, and flows through the cooling passage 64 of the air passage cylinder portion 7 and is discharged above the slit 72b. The upper end is bent diagonally forward and upward so that the high-temperature exhaust gas discharged upwards drifts forward so that the cooling air that flows will not flow toward the rear wall and heat the wall. Therefore, in this embodiment, the upper inclined portion 81 at the upper end is inclined so as to form an angle of 30 to 60 degrees from the horizontal direction.

  In addition, a deflection unit 45 is provided at the upper end of the exhaust tube unit 40. As shown in FIGS. 5 and 6, the deflecting portion 45 directs the flow of high-temperature exhaust gas that flows through the exhaust tube portion 40 and is discharged from the upper end opening 43 to the front. The deflection unit 45 has an upper swash plate 45a that is obliquely 30 to 60 degrees above the front (45 degrees in the present embodiment) and an inner 30 to 60 degrees (45 degrees in the present embodiment) that is obliquely forward. The flow that hits the upper swash plate 45a changes its direction diagonally upward from the front, and the flow that hits the side swash plate 45b changes its direction diagonally inward from the front so as to leave the wall. Flowing.

  The deflection portion 45 is provided at the upper end portion of the exhaust cylinder portion 40, and the exhaust cylinder portion 40 and the deflection portion 45 form the exhaust flue 4 serving as an exhaust gas flow path. The deflection part 45 is covered with the air flow path cylinder part 7 and the drift part 8, and the space between them is a cooling air flow path.

  Next, the water supply pipe 9 will be described with reference to FIGS. The water supply pipe 9 is a pipe for supplying water from a water source (not shown) such as a water supply to the cooking pan N placed on the heat ring 5. Are arranged vertically along the outer surface of the side. The lower end portion (upstream end portion) of the water supply pipe 9 is disposed in the vicinity of the lower end portion of the gas low range, and pipes and hoses from the water supply are connected thereto. A movable currant 91 is connected to the upper end (downstream end) of the water supply pipe 9, and the spout at the tip of the currant 91 is positioned above the cooking pan N placed on the heat ring 5. Water can be poured into the cooking pan N.

  And the lower part (upstream side) part of the currant 91 of the water supply pipe 9 is used as the heat exchange part 90. The heat exchanging unit 90 includes a part of the water supply pipe 9 as a pipe as a heat exchanger, and can be disposed in the exhaust flue 4 or at the outlet of the exhaust flue 4 so that the exhaust flue 4 can be disposed. It recovers the heat of the hot exhaust gas exhausted through. In this embodiment, the heat exchange part 90 is a part near the discharge opening 80 at the upper end of the gas low range in the vertical direction, and this part of the pipe is formed by a φ8 copper heat transfer tube 9a and the discharge opening. The heat transfer pipe 9a is arranged so that there are six paths in the exhaust gas flow path (exhaust flue 4) in 80, but the heat transfer pipe 9a as a movable part and the heat exchange part 90 of the water supply pipe 9 A universal joint 94 is provided between the pipes 9b of the fixing parts on both sides (that is, the upstream side and the downstream side), and the fixing part 75 is fixed to a fixing piece 75 fixed so as to protrude from the outer surface of the air flow path cylinder part 7. The pipe 9b is fixed so that the heat transfer tube 9a of the heat exchanging portion 90 is rotatable in the horizontal direction, and the heat transfer tube 9a is disposed in the exhaust gas flow path in the discharge opening 80 (inserted state). The heat transfer tube 9a is connected to the discharge opening 80. And a state (referred to as extended state) where the exhaust gas does not hit out can be selected freely. Moreover, the cover plate 93 which covers the part exposed ahead from the discharge opening 80 of the heat exchanger tube 9a in the insertion state of the heat exchanger tube 9a is provided. The heat exchanging unit 90 can be prevented from interfering with the cooking pan N by allowing the heat exchanging unit 90 to be rotated by 90 ° or more from the insertion state in the pulled out state.

  In the above-described gas low range, the cooking pan N is placed on the heat ring 5 and the combustion gas burner 2 is combusted with the heat exchanging portion 90 of the water supply pipe 9 in the inserted state. Prior to this, it is desirable to put a little water in the cooking pan N to prevent empty cooking. When combustion in the combustion gas burner 2 is started, the currant 91 is opened to supply water, and heat exchange in the heat exchanging unit 90 is performed.

  In this embodiment, when water is supplied at a cooking pan N of 70 liters (at least 50 liters are necessary for business use) and the water supply speed is 6 liters / minute, the water temperature at the end of the water supply is the heat exchanger. Compared to the case where heat exchange by 90 was not performed, the temperature increased by 5 ° C. If the heating time is 1 hour, the output of the combustion gas burner 2 is 18000 kcal / h, and the thermal efficiency is 30.6%, the amount of water heated by the combustion of the combustion gas burner 2 is 5508 kcal / h, of which the heat exchange unit 90 collects it. The amount of heat is 70 kg × 5 ° C. × 1 Kcal / Kg = 350 kcal when the specific heat of water is 1 Kcal / Kg, and about 6% of the 5508 kcal is recovered.

  Thereby, by collecting and effectively using the exhaust heat of the exhaust gas, energy saving can be achieved and the heating time can be shortened.

  When water (hot water) is not supplied to the cooking pan N or when a predetermined amount of water has accumulated in the cooking pan N, the empty heat transfer pipe 9a is exhausted by placing the heat exchange unit 90 in a drawn state. It is possible to prevent the hot exhaust gas passing through the road 4 from being overheated and damaged.

It is a front view of one embodiment of the present invention. It is a perspective view of the principal part (heat exchange part of a water supply pipe) of the present invention. One Embodiment of the gas low range of this invention is shown, (a) is a top view, (b) is a principal part top view. It is a figure of the principal part (combustion chamber) for demonstrating this invention, (a) is front sectional drawing, (b) is a top view. It is a side view same as the above. It is a whole perspective view same as the above. It is a whole perspective view of the state which loaded the pot in the same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body casing 2 Combustion gas burner 3 Combustion chamber 4 Exhaust flue 40 Exhaust cylinder part 5 Heating ring 7 Air flow path cylinder part 80 Discharge opening 9 Water supply pipe 9a Heat transfer pipe 9b Fixed part piping 91 Currant 93 Cover plate N Cooking pan

Claims (2)

  A combustion chamber provided with a combustion gas burner is disposed in the main body casing, and an exhaust flue for exhausting exhaust gas from the combustion chamber is provided from the combustion chamber to the outside of the main body casing, and when the cooking pan is placed, In a gas low range where a heat ring that closes the upper end opening is provided at the upper end of the combustion chamber, a water supply pipe for supplying water from a water source to a cooking pan placed on the heat ring is provided, and a part of the water supply pipe is heated. A gas low range characterized in that the gas low range is arranged as an exchange part in a discharge opening through which exhaust gas is discharged in or through the exhaust flue.   An air flow path cylinder having an exhaust flue inside projects upward from the rear part of the main body casing, and a discharge opening is disposed at the upper end of the air flow path cylinder, and is formed on the outer surface of the air flow path cylinder. A water supply pipe is disposed so as to pass through the vicinity of the discharge opening, and a portion passing through the vicinity of the discharge opening of the water supply pipe is constituted by a heat transfer pipe as a heat exchange section, and the water supply pipes on the upstream side and the downstream side of the heat transfer pipe The gas low range according to claim 1, wherein the connecting portion is connected by a universal joint.

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