CN212618495U - Heat exchange circulation system for commercial gas stove - Google Patents

Abstract

A heat exchange circulation system for a commercial gas cooker comprises a heat exchanger, a cooker plate, a water tank, a conversion preheater and an exhaust fan; the heat exchanger comprises an outer cylinder, an inner cylinder and a fire tube; the heat exchanger is divided into an upper chamber for containing circulating water and a lower chamber for leading out flame for preheating, and the upper chamber and the lower chamber are respectively connected with the water tank and the exhaust fan. The utility model can effectively improve the utilization efficiency of the gas and prevent heat waste by arranging the open-circuit exhaust system and the closed-circuit water circulation system; meanwhile, the temperature of the kitchen is reduced, and particularly, the working environment of the kitchen can be effectively improved in summer; in addition, waste heat generated by combustion of gas in a commercial gas stove can be effectively collected and then used for heating water and oil, waste materials are changed into valuable materials, and the hot water and the hot oil are continuously provided for a kitchen.

Description

Heat exchange circulation system for commercial gas stove

Technical Field

The utility model relates to a kitchen utensil technical field, concretely relates to commercial is heat exchange circulation system for gas stove.

Background

In modern society, as people increase in work pressure and living standard and need to be compensated, more and more people choose to go to restaurants and restaurants for daily dining and gathering of friends. In addition, compared with a household gas stove, the gas stove used in restaurants and restaurants has strong firepower, and is better in taste for the dish which is popular among Chinese people and fried with strong fire, so that more people who seek food can choose to go to the restaurants and restaurants for eating.

According to the cooking mode of Chinese people, in order to ensure the color, aroma and taste of dishes, when restaurants and restaurants fry the dishes in an explosion mode, the air inlet opening of the gas stove is generally adjusted to be the largest, at the moment, flame above the stove head of the gas stove can diffuse to the periphery along the bottom of the frying pan after being sprayed to the bottom of the frying pan, and the redundant flame diffusing to the periphery can reach the upper edge of the frying pan and is even higher. The biggest problem caused by the method is that the utilization rate of fuel gas is low, and great heat waste is caused. In addition, the temperature of the kitchen may be greatly increased, and the working environment of the kitchen may be seriously deteriorated particularly in summer.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to not enough among the prior art, designed one kind and provided a commercial heat exchange circulation system for gas-cooker, its aim at solves commercial gas-cooker gas low-usage and the serious problem of heat waste.

The specific contents are as follows:

a heat exchange circulation system for a commercial gas cooker comprises a heat exchanger, a cooker plate, a water tank, a conversion preheater and an exhaust fan;

the heat exchanger comprises an outer cylinder, an inner cylinder and a fire tube; the outer cylinder and the inner cylinder are both provided with openings at the upper part and the lower part; the inner cylinder is sleeved in the outer cylinder; the fire tubes are vertically arranged in an annular space between the outer wall of the inner barrel and the inner wall of the outer barrel; a distance is reserved between the fire tube and the bottom end of the annular space;

the heat exchanger also comprises an upper plug, a middle plug and a lower plug; the upper plug seals the space between the edge of the upper end of the fire tube and the inner wall of the outer barrel and the outer wall of the inner barrel, and the middle plug seals the annular space between the edge of the lower end of the fire tube and the inner wall of the outer barrel and the outer wall of the inner barrel to form an upper chamber; the lower plug seals an annular space between the inner wall of the outer cylinder and the outer wall of the inner cylinder at the bottom end of the heat exchanger to form a lower chamber, and the lower chamber is communicated with the fire tube;

the cooking plate is arranged at the top of the heat exchanger, is annular and covers the upper pipe orifice of the fire pipe; the inner side of the kitchen range is provided with a hole corresponding to the position of the fire tube and used as a fire hole for communicating the space between the fire tube and the inner cylinder;

the cooking range of the gas stove is arranged below the heat exchanger;

the outer wall of the upper cavity is connected with a water outlet pipe A and a water inlet pipe A; the water outlet pipe A and the water inlet pipe A are both connected with a water tank; a conversion preheater is arranged on a pipeline between the water tank and the water inlet pipe A;

the lower chamber is connected with an air outlet pipe on the outer wall of the outer barrel, and the air outlet pipe is connected with an exhaust fan.

The heat exchange circulation system comprises an open-circuit exhaust system and a closed-circuit water circulation system. In the open-circuit exhaust system, the small holes on the inner side of the stove plate are communicated with the chamber on the lower part of the stove plate, the chamber on the lower part of the stove plate is communicated with the upper ends of the fire tubes on the upper part of the heat exchanger, the lower ends of all the fire tubes are communicated with the lower chamber of the heat exchanger, and the air outlet pipe of the lower chamber of the heat exchanger is communicated with the exhaust fan. In the closed-circuit water circulation system, a water outlet pipe A of the heat exchanger is connected with a water inlet pipe B of the water tank, the water outlet pipe B of the water tank is connected with a water inlet pipe A of the conversion preheater, a water outlet pipe C of the conversion preheater is connected with a water inlet pipe C of the heat exchanger, and all connecting pipelines are made of 304 stainless steel. In addition, in the closed water circulation system, purified water is introduced into the water tank through the faucet, so that the water level in the water tank is kept at a position slightly higher than the water inlet pipe of the water tank.

In practical use, the mixed gas sprayed from the cooking range is burnt in the heat exchanger to form high-temperature and violent flame, and the flame is vertically sprayed to the bottom of the frying pan for cooking. Due to the influence of the radian of the bottom of the wok, the flame far away from the center of the bottom of the wok can be sprayed to the periphery along the curved surface of the wok, the heating effect of the high-temperature fierce fire on the wok is greatly reduced, but the heating effect on the surrounding air is very large. In this case, the open-circuit exhaust system is used to introduce the high-temperature airflow jetted from the bottom of the frying pan to the periphery into the fire tube of the heat exchanger through the small holes of the cooking plate, and then the high-temperature airflow is collected in the lower cavity of the heat exchanger and exhausted by the exhaust fan. Meanwhile, as the cavity at the upper part of the heat exchanger is filled with water, when high-temperature airflow flows from top to bottom along the fire tubes which are uniformly distributed, the water in the cavity can be rapidly heated, so that the heated water in the cavity can flow from bottom to top, and then the water in the closed-circuit water circulation system is pushed to maintain a flowing state, and finally the water in the water tank and the cavity of the conversion preheater is maintained at about 90 ℃.

The hot water in the water tank is mainly used as follows: (1) when cooking, water is often added into the frying pan, and hot water in the water tank is used, so that the temperature loss of the frying pan can be greatly reduced, and the aims of reducing the cooking time and reducing the gas consumption are fulfilled; (2) the cleaning agent is used for cleaning some tableware which is difficult to clean and has large greasy dirt; (3) the temperature in winter is low, and before dishes are contained, the tableware is preheated by using the hot water in the water tank, so that the cooling speed of the dishes on a table can be reduced, and the color, the smell and the taste of the dishes in the tableware can be kept for a longer time.

The hot water, when flowing in the closed water circulation system, causes the conversion preheater temperature to rise. The preheating converter is filled with cooking edible oil, and the hot oil in the preheating converter is used, so that the temperature loss of the frying pan can be reduced, the gas consumption is reduced, and the purpose of saving gas is achieved.

Further, in order to avoid excessive absorption of heat of the main flame in the inner cylinder of the heat exchanger by water in the heat exchanger and improve the heating efficiency of the main flame in the inner cylinder of the heat exchanger on the frying pan, the inner wall of the inner cylinder is coated with refractory mortar; refractory mortar can be coated on the gaps between the inner wall of the inner cylinder and the stove plate and the stove head.

Furthermore, when the stove plate is installed, the sealing rock wool is stuffed in a gap where the stove plate is contacted with the outer cylinder, so that air with lower external temperature can be prevented from entering a fire tube of the heat exchanger along the gap between the outer cylinder of the heat exchanger and the stove plate, and the heat exchange efficiency of the heat exchanger is reduced.

Furthermore, 19 ~ 24 firetubes, the equipartition is in the annular space between inner tube and urceolus.

Further, the water outlet pipe A is arranged on the upper part of the outer wall of the upper cavity; the water inlet pipe A is arranged at the lower part of the outer wall of the upper chamber.

Further, the water tank is of a double-layer heat-preservation structure, and is preferably made of food-grade 304 stainless steel.

Further, the heat exchanger is made of stainless steel, preferably food grade 304 stainless steel.

Further, the exhaust fan is a commercially available axial flow fan with a speed regulation function.

The utility model has the advantages as follows:

the utility model can effectively improve the utilization efficiency of the gas and prevent heat waste by arranging the open-circuit exhaust system and the closed-circuit water circulation system; meanwhile, the temperature of the kitchen is reduced, and particularly, the working environment of the kitchen can be effectively improved in summer; in addition, waste heat generated by combustion of gas in a commercial gas stove can be effectively collected and then used for heating water and oil, waste materials are changed into valuable materials, and the hot water and the hot oil are continuously provided for a kitchen.

Drawings

Fig. 1 is a schematic view of a heat exchange cycle system according to embodiment 1 of the present invention;

FIG. 2 is an assembled cross-sectional view of a heat exchanger according to the present invention;

FIG. 3 is an exploded view of a heat exchanger according to the present invention;

in the figure: 1-1, an outer cylinder; 1-2, inner cylinder; 1-3, fire tubes; 1-4, an upper plug; 1-5, a middle plug; 1-6, lower plug; 1-7, an upper chamber; 1-8, a lower chamber; 1-9 parts of a water outlet pipe A; 1-10 parts of water inlet pipe A; 1-11 parts of an air outlet pipe; 1-12, refractory mortar; 2. a cooking plate; 3. a water tank; 3-1, a water inlet pipe B; 3-2, a water outlet pipe B; 4. a conversion preheater; 4-1, a water inlet pipe C; 4-2, a water outlet pipe C; 5. an exhaust fan; 6. A cooking range; 7. sealing the rock wool; 8. a frying pan;

in fig. 1, a solid line with arrows represents the flow direction of water; the dashed line with arrows indicates the direction of the air flow.

Detailed Description

The principles and features of the present invention are described below in conjunction with examples, which are set forth only to illustrate the present invention and are not intended to limit the scope of the present invention.

Example 1

A heat exchange circulation system for a commercial gas cooker comprises a heat exchanger, a cooker plate 2, a water tank 3, a conversion preheater 4 and an exhaust fan 5;

the heat exchanger comprises an outer cylinder 1-1, an inner cylinder 1-2 and a fire tube 1-3;

the outer cylinder 1-1 is formed by welding stainless steel plate wound rolls, the height is 210mm, the wall thickness is 1.5mm, the outer diameter is 380mm, holes with the diameter of 30mm are drilled at positions 25mm and 100-120 mm away from the lower end and 40-50 mm away from the upper end of the side surface of the outer cylinder, and the holes are respectively used for installing an air outlet pipe 1-11, a water inlet pipe A1-10 and a water outlet pipe A1-9;

the lengths of the water inlet pipe A1-10 and the water outlet pipe A1-9 are both 150mm, and the water inlet pipe A1-10 and the water outlet pipe A1-9 are cut by stainless steel pipes with the thickness of 2mm and the diameter of 30 mm; the water inlet pipe A1-10 is arranged at a position 100-120 mm away from the lower end of the side surface of the outer barrel, and the water outlet pipe A1-9 is arranged at a position 40-50 mm away from the upper end of the side surface of the outer barrel;

the length of the air outlet pipe 1-11 is 150mm, the air outlet pipe is formed by cutting a stainless steel pipe with the thickness of 2mm and the diameter of 30mm, and the air outlet pipe is arranged at a position 25mm away from the lower end of the side surface of the outer cylinder;

the inner cylinder 1-2 is formed by welding stainless steel plate winding drums, the height is 210mm, the wall thickness is 1.5mm, and the outer diameter is 360 mm;

the height of the fire tubes 1-3 is 150mm, the fire tubes are cut by stainless steel tubes with the wall thickness of 1.5mm and the diameter of 12mm, and the number of the fire tubes is 19-24;

the heat exchanger also comprises an upper plug 1-4, a middle plug 1-5 and a lower plug 1-6;

the upper plugs 1-4, the middle plugs 1-5 and the lower plugs 1-6 are all cut by stainless steel plates with the thickness of 1.5mm, the outer diameters of all the plugs are 377mm, and the inner diameters of all the plugs are 360 mm;

the upper plugs 1-4 and the middle plugs 1-5 are uniformly distributed with 19-24 holes with the diameter of 12 mm. The upper plug 1-4 is positioned at the uppermost end of the heat exchanger and is welded with the upper ends of the outer cylinder, the inner cylinder and the fire tube; the middle plug 1-5 is positioned at the position 60mm away from the bottom end of the heat exchanger and is welded with the lower ends of the outer cylinder 1-1, the inner cylinder 1-2 and the fire tube 1-3.

The lower plug 1-6 is positioned at the lowest end of the heat exchanger and is welded with the lower ends of the outer cylinder 1-1 and the inner cylinder 1-2.

The closed cavity between the upper plug 1-4 and the middle plug 1-5 is called as an upper cavity 1-7 and is used for water flow to pass through;

the closed cavity between the middle plug 1-5 and the lower plug 1-6 is called as a lower cavity 1-8 and is communicated with the fire tube 1-3 for air flow to pass through;

the cooking stove 2 is made of cast iron, is arranged at the top of the heat exchanger and covers the upper pipe orifices of the fire tubes 1-3; 19-24 fire holes are formed in the inner side of the cooking stove 2 corresponding to the positions of the fire tubes 1-3;

coating refractory mortar 1-12 on the inner wall of the inner cylinder; refractory mortar 1-12 is coated on the gap between the inner wall of the inner cylinder 1-1 and the cooking stove 2 and the cooking range 6;

sealing rock wool 7 is stuffed in a gap where the stove plate 2 is contacted with the outer cylinder 1-1;

the cooking range 6 of the gas stove is arranged below the heat exchanger;

a water outlet pipe A1-9 of the conversion preheater is connected with a water inlet pipe B3-1 of the water tank 3, a water outlet pipe B3-2 of the water tank 3 is connected with a water inlet pipe C4-1 of the conversion preheater 4, and a water outlet pipe C4-2 of the conversion preheater 4 is connected with a water inlet pipe A1-10 of the heat exchanger;

an air outlet pipe 1-11 of the conversion preheater is connected with an exhaust fan 5.

In practical use, the mixed gas from the cooking range 6 is burnt in the heat exchanger to form high-temperature and violent flame, which is vertically sprayed to the bottom of the frying pan 8 for cooking. Due to the influence of the radian of the bottom of the frying pan 8, the flame far away from the center of the bottom of the frying pan 8 can be sprayed to the periphery along the curved surface of the frying pan, the heating effect of the high-temperature fierce fire on the frying pan 8 is greatly reduced, but the heating effect on the surrounding air is very large. In this case, the open-circuit exhaust system is used to introduce the high-temperature airflow jetted from the bottom of the frying pan 8 to the periphery into the fire tubes 1-3 of the heat exchanger through the small holes of the cooking plate 2, and then the high-temperature airflow is collected in the lower cavity 1-8 of the heat exchanger and exhausted by the exhaust fan 5. Meanwhile, as the upper cavity 1-7 of the heat exchanger is filled with water, when high-temperature airflow flows from top to bottom along the evenly distributed fire tubes 1-3, the water in the cavity can be rapidly heated, so that the heated water in the upper cavity 1-7 flows from bottom to top, the water in the closed water circulation system is pushed to maintain a flowing state, and finally the water in the water tank 3 and the upper cavity 1-7 of the conversion preheater is maintained at about 90 ℃.

Experimental example 1

Experiment using the heat exchange cycle system for commercial gas cookers in example 1

And opening the gas stove, adjusting the opening of gas and the rotating speed of the exhaust fan to adjust the height of flame sprayed to the frying pan by the stove to be optimal, standing to cool all parts of the gas stove to room temperature, and then starting testing. During testing, 3L of water is injected into the wok, water is slowly injected into the water tank to remove air in the water circulation system, and the water injection is stopped when the water level is slightly higher than the water inlet pipe of the water tank, so that the total water volume in the water circulation system is 14L; 2L of peanut oil was added to the preheat changer. The temperature of the water in the frying pan and the water tank and the temperature of the oil in the preheating converter are both measured by a thermometer and are both 17 ℃. And (4) opening the gas stove and timing, and closing the gas stove and stopping timing when the water in the wok begins to boil. As shown in Table 1, the water in the pan boiled for 176s, the water temperature in the water tank reached 29 deg.C, the oil temperature in the preheat converter increased to 21 deg.C, and the gas usage was 0.102 kG.

Experimental example 2

On the basis of example 1, the water in the pan was poured off, 3L of water was taken from the water tank and poured into the pan, and then 3L of water at 17 ℃ was replenished into the water tank, with the other conditions being unchanged. The temperature of the water in the wok measured by the thermometer was 29 ℃, the temperature of the water in the water tank was 25 ℃, and the temperature of the oil in the preheating converter was 21 ℃. And (4) opening the gas stove and timing, and closing the gas stove and stopping timing when the water in the wok begins to boil. As shown in Table 1, after the water in the 151s frying pan is boiled, the water temperature in the water tank reaches 37 ℃, the oil temperature in the preheating converter is increased to 25 ℃, and the gas consumption in the process is 0.087 kG.

Experimental example 3

On the basis of example 2, the water in the pan was poured off, 3L of water was taken from the water tank and poured into the pan, and then 3L of water at 17 ℃ was replenished into the water tank, with the other conditions being unchanged. The temperature of the water in the wok measured by the thermometer is 37 ℃, the temperature of the water in the water tank is 32 ℃, and the temperature of the oil in the preheating converter is 25 ℃. And (4) opening the gas stove and timing, and closing the gas stove and stopping timing when the water in the wok begins to boil. As shown in Table 1, the water in the pan boiled for 134s, the water temperature in the water tank reached 43 deg.C, the oil temperature in the preheat converter increased to 29 deg.C, and the gas consumption in this process was 0.077 kG.

Experimental example 4

On the basis of example 3, the water in the pan was poured off, 3L of water was taken from the water tank and poured into the pan, and then 3L of water at 17 ℃ was replenished into the water tank, with the other conditions being unchanged. The temperature of the water in the wok measured by the thermometer was 43 ℃, the temperature of the water in the water tank was 37 ℃, and the temperature of the oil in the preheating converter was 29 ℃. And (4) opening the gas stove and timing, and closing the gas stove and stopping timing when the water in the wok begins to boil. As shown in Table 1, when the water in the frying pan is boiled for 121s, the water temperature in the water tank reaches 48 ℃, the oil temperature in the preheating converter rises to 34 ℃, and the gas consumption in the process is 0.070 kG.

TABLE 1

Experimental example 5

And opening the gas stove, adjusting the opening of gas and the rotating speed of the exhaust fan to adjust the height of flame sprayed to the frying pan by the stove to be optimal, standing to cool all parts of the gas stove to room temperature, and then starting testing. During testing, 3L of water is injected into the wok, water is slowly injected into the water tank to remove air in the water circulation system, and the water injection is stopped when the water level is slightly higher than the water inlet pipe of the water tank, so that the total water volume in the water circulation system is 14L; 2L of peanut oil was added to the preheat changer. The temperature of the water in the frying pan and the water tank and the temperature of the oil in the preheating converter are both measured by a thermometer and are both 17 ℃. And opening the gas stove to continuously work until the water inlet pipe in the water tank flows out of the water tank and no hot water exists, spraying water vapor, and closing the gas stove. As shown in Table 2, the process lasts 1200s, the water in the frying pan is already boiling, the water temperature in the water tank reaches 92 ℃, the oil temperature in the preheating converter is increased to 51 ℃, and the gas dosage in the process is 0.683 kG.

TABLE 2

Experimental example 6

On the basis of example 5, the water in the pan was poured off, 3L of water was taken from the water tank and poured into the pan, and then 3L of water having a temperature of 17 ℃ was replenished into the water tank, with the other conditions being unchanged. The temperature of the water in the wok measured by the thermometer was 92 ℃, the temperature of the water in the water tank was 81 ℃, and the temperature of the oil in the preheating converter was 51 ℃. And (4) opening the gas stove and timing, and closing the gas stove and stopping timing when the water in the wok begins to boil. As shown in Table 1, after the water in the frying pan is boiled for 29s, the water temperature in the water tank reaches 89 ℃, the oil temperature in the preheating converter rises to 52 ℃, and the gas consumption in the process is only 0.017 kG.

TABLE 3

Comparative example

3L of water is injected into the frying pan, and the temperature of the water in the frying pan is measured to be 17 ℃ by a thermometer. And (3) opening the gas stove and timing, when the water in the wok begins to boil, closing the gas stove and stopping timing, and testing the gas consumption to finish the test of the comparative example 1. Then, the water boiled in the pan was poured off, and the above-described operation was repeated to complete the tests of comparative example 2, comparative example 3, and comparative example 4 in this order. As shown in table 4, in comparative example 1, since the temperatures of the pan of the burner of the gas range and the wok were low in the initial state, the water in the wok was boiled after 172s, and the amount of gas used in this process was 0.101 kG. In comparative examples 2, 3 and 4, since the temperatures of the burner, the cooktop and the pan of the gas range and the wok were all raised to be high, the water in the wok was boiled for about 164 to 165 seconds, and the amount of gas used in this process was 0.097 kG. After that, even if more comparative examples are added, the boiling time of water in the wok and the amount of fuel gas are kept unchanged.

TABLE 4

As can be seen from the above 6 experimental examples and 4 comparative examples, when restaurants and restaurants are in normal business everyday, the frequency of using their commercial gas stoves is very high, and the heat exchange circulation system of the utility model is installed on the traditional commercial gas stoves, and its significant advantages lie in that: (1) waste heat generated by combustion of gas in a commercial gas stove can be effectively collected and used for heating water and oil, so that waste is changed into valuable, and the hot water and hot oil are continuously provided for a kitchen; (2) the fuel gas consumption can be obviously reduced, and effective energy conservation is realized; (3) can obviously reduce the temperature of the kitchen and improve the working environment. Can achieve multiple purposes.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (8)

1. A heat exchange circulating system for a commercial gas stove is characterized by comprising a heat exchanger, a stove plate (2), a water tank (3), a conversion preheater (4) and an exhaust fan (5);

the heat exchanger comprises an outer cylinder (1-1), an inner cylinder (1-2) and a fire tube (1-3); the outer cylinder (1-1) and the inner cylinder (1-2) are both provided with an upper opening and a lower opening; the inner cylinder (1-2) is sleeved in the outer cylinder (1-1); the fire tubes (1-3) are vertically arranged in an annular space between the inner cylinder (1-2) and the outer cylinder (1-1); the fire tubes (1-3) are spaced from the bottom end of the annular space;

the heat exchanger also comprises an upper plug (1-4), a middle plug (1-5) and a lower plug (1-6); the upper plug seals the space between the edge of the upper end of the fire tube (1-3) and the outer cylinder (1-1) and the inner cylinder (1-2), and the middle plug (1-5) seals the space between the edge of the lower end of the fire tube (1-3) and the outer cylinder (1-1) and the inner cylinder (1-2) to form an upper chamber (1-7); the lower plug (1-6) seals an annular space between the outer cylinder (1-1) and the inner cylinder (1-2) at the bottom end of the heat exchanger to form a lower chamber (1-8);

the cooking plate (2) is arranged at the top of the heat exchanger and covers the upper end pipe orifice of the fire pipe (1-3); the inner side of the cooking plate (2) is provided with a hole corresponding to the position of the fire tube (1-3);

a cooking range (6) of the gas stove is arranged below the heat exchanger;

the outer wall of the upper cavity (1-7) is connected with a water outlet pipe A (1-9) and a water inlet pipe A (1-10); the water outlet pipe A (1-9) and the water inlet pipe A (1-10) are both connected with the water tank (3); a conversion preheater (4) is arranged on a pipeline between the water tank (3) and the water inlet pipe A (1-10);

the lower chamber (1-8) is connected with an air outlet pipe (1-11) on the outer wall of the outer cylinder (1-1), and the air outlet pipe (1-11) is connected with an exhaust fan (5).

2. The heat exchange cycle system for commercial gas cookers, according to claim 1, wherein the inner wall of the inner cylinder (1-2) is coated with refractory mortar (1-12).

3. The heat exchange cycle system for commercial gas cookers according to claim 2, wherein the refractory mortar (1-12) is applied to the gaps between the inner wall of the inner cylinder (1-2) and the cooktop (6) and the cooktop (2).

4. The heat exchange cycle system for the commercial gas cooker as set forth in claim 1, wherein the sealing rock wool (7) is inserted into a gap where the cooktop (2) is in contact with the outer tub (1-1).

5. The heat exchange cycle system for commercial gas cookers according to claim 1, wherein the number of fire tubes (1-3) is 19-24, which are uniformly distributed in the annular space between the inner cylinder (1-2) and the outer cylinder (1-1).

6. The heat exchange cycle system for commercial gas cookers according to claim 1, wherein the outlet pipe a (1-9) is provided at an upper portion of the upper chamber (1-7); the water inlet pipe A (1-10) is arranged at the lower part of the upper chamber (1-7).

7. The heat exchange cycle system for commercial gas cookers according to claim 1, wherein the water tank (3) has a double-layered heat insulating structure.

8. The heat exchange cycle system of the commercial gas cooker as set forth in claim 1, wherein said heat exchanger is made of stainless steel.

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