CN115089020A

CN115089020A - Heating control method and cooking machine

Info

Publication number: CN115089020A
Application number: CN202210763451.5A
Authority: CN
Inventors: 洪金文
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2022-09-23

Abstract

The invention provides a heating control method and a cooking machine, relating to the technical field of catering equipment, wherein the heating control method comprises the steps of covering a lunch box by using a sealing cover; heating the food in the meal box for X seconds; monitoring a first post-temperature outside the meal box after heating food in the meal box; if the first rear temperature is higher than or equal to a first preset temperature, continuing to heat the food in the meal box, and stopping heating after the duration of Y seconds; monitoring a second post temperature outside the meal box after heating food in the meal box; and if the second rear temperature is lower than or equal to the second preset temperature, separating the sealing cover and the lunch box. The method for automatically heating the food does not cause the situation that the food is not well cooked, and the lunch box is not easy to explode.

Description

Heating control method and cooking machine

Technical Field

The invention relates to the technical field of catering equipment, in particular to a heating control method and a cooking machine.

Background

The cooking machine is gradually popular in our daily life, and the problem of high labor cost of merchants is solved because the cooking machine does not need to be watched manually, and the cooking machine is operated for 24 hours and is convenient for consumers to purchase meals at any time. The food cooking machine generally uses high-temperature steam to heat and cook food, however, the high-temperature steam cannot adaptively control the heating of food, and the phenomenon that the food is not cooked or is excessively heated to explode a lunch box filled with food often occurs, which is a problem to be solved at present.

Disclosure of Invention

Accordingly, it is necessary to provide a heating control method and a cooking machine for solving the problem that the food is not cooked well or the lunch box containing the food is exploded due to overheating because the food is heated by the high-temperature steam of the cooking machine and cannot be controlled adaptively.

The invention provides a heating control method, which comprises the following steps:

covering the lunch box by using a sealing cover;

heating the food in the meal box for X seconds;

monitoring a first post temperature outside the meal box after heating food in the meal box;

if the first rear temperature is higher than or equal to a first preset temperature, continuing to heat the food in the meal box, and stopping heating after the duration of Y seconds;

monitoring a second post-temperature outside the meal box after heating food in the meal box;

and if the second rear temperature is lower than or equal to the second preset temperature, separating the sealing cover from the lunch box.

The heating control method can heat the food for X seconds first, and at least can ensure that the food is basically cooked. After X seconds of heating, monitoring of the first post-temperature after heating of the food is again commenced. If the first post-temperature is higher than or equal to the first preset temperature, the heating is stopped after the heating is continued for Y seconds, so as to ensure that the food is completely cooked. And then continuously monitoring the second rear temperature after heating the food, and if the second rear temperature is lower than or equal to the second preset temperature, separating the sealing cover and the lunch box to avoid sealing the lunch box which is separated from the lunch box in advance and easily causing the explosion of the lunch box. The method for automatically heating the food is not easy to cause the situation that the food is not well cooked, and the lunch box is not easy to explode.

In one embodiment, X is 30 and Y is 60.

In one embodiment, the first predetermined temperature is 98 ℃.

In one embodiment, the second predetermined temperature is 75 ℃ to 80 ℃.

In one embodiment, after the food in the box is stopped being heated, the food in the box is cooled at a third preset temperature for a first preset time.

In one embodiment, the third preset temperature is 1-5 ℃, and the first preset time is five-ten seconds.

In one embodiment, if the first rear temperature is lower than the second preset temperature, the food in the lunch box is continuously heated for A seconds; if the first rear temperature is higher than the second preset temperature and lower than the first preset temperature, continuing to heat the food in the lunch box for B seconds, wherein B is less than A.

The present invention also provides a food cooking machine comprising:

a controller for implementing the heating control method;

the steam engine is connected with the controller and used for heating food in the meal box at the first preset temperature;

the sealing cover is used for sealing the lunch box containing food;

the air inlet pipe is connected with the steamer and the sealing cover so that high-temperature steam output by the steamer is conveyed into the lunch box through the air inlet pipe;

the exhaust pipe is used for exhausting high-temperature steam after the food in the lunch box is heated;

the temperature monitor is arranged on the exhaust pipe, connected with the controller and used for monitoring the rear temperature discharged after the high-temperature steam heats the food.

In one embodiment, the cooking machine further comprises a cooler, the cooler is connected with the controller and the air inlet pipe, and when the controller controls the steamer to stop delivering high-temperature steam, the cooler delivers cold air into the lunch box through the air inlet pipe so as to temporarily cool the lunch box.

In one embodiment, the cooking machine further comprises a recovery device, wherein the recovery device is connected with the exhaust pipe and is used for liquefying the high-temperature steam discharged by the exhaust pipe into water and recovering the water.

Drawings

FIG. 1 is a schematic view of the construction of the cooking apparatus of the present invention;

FIG. 2 is a schematic view of the structure of the air release device of the present invention;

FIG. 3 is a schematic view of the run-flat device of the present invention in an exploded configuration;

FIG. 4 is a schematic structural view of a heating rod according to the present invention;

FIG. 5 is a flow chart of a heating control method of the cooking device of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

100. a cooking machine;

1. a machine platform; 11. a first layer; 12. a second layer; 13. a third layer;

2. a cooking assembly; 21. an air inlet pipe; 22. a sealing cover; 221. a cover body; 222. a flange; 223. reinforcing ribs; 224. a seal ring; 225. a heating rod; 2251. an air outlet; 2252. an air intake passage; 23. an exhaust pipe; 24. a driving cylinder; 25. a buffer spring;

3. a control component;

4. a recovery assembly; 41. a transfer member; 411. a first end; 412. a second end; 413. a transit passage; 42. A water supply member; 421. a shower head; 43. a recovery tank; 44. a water pump; 441. a water supply pipe; 442. a delivery pipe;

5. a meal box.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is understood that the specific details described below are merely exemplary of some embodiments of the invention, and that the invention may be practiced in many other embodiments than as described herein. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1, the present invention provides a food cooking machine 100, wherein the food cooking machine 100 can independently control high-temperature steam to heat food, so as to ensure complete cooking of the food, prevent a lunch box containing the food from bursting, and improve the stability of smooth food serving. The food may be, but is not limited to, vermicelli, noodles, raw meat, or the like.

The cooking machine 100 comprises a machine table 1, a cooking assembly 2, a control assembly 3 and a recovery assembly 4, wherein the cooking assembly 2, the control assembly 3 and the recovery assembly 4 are all arranged on the machine table 1.

The machine 1 sequentially comprises a first layer 11, a second layer 12 and a third layer 13 from bottom to top, wherein the first layer 11 is a layer close to the ground, and the third layer 13 is a layer farthest from the ground. Both the second layer 12 and the third layer 13 can be used for mounting the stationary cooking assembly 2, the control assembly 3 and the recovery assembly 4.

A complete cooking system can be formed by a group of cooking assemblies 2, a control assembly 3 and a recovery assembly 4, and the food can be heated and cooked for a meal box 5 circularly. The machine table 1 is provided with two groups of cooking systems which are respectively arranged on the second layer 12 and the third layer 13, so that food can be heated and cooked for the two meal boxes 5 at the same time, and the cooking efficiency is improved.

The cooking assembly 2 comprises an air inlet pipe 21, a sealing cover 22, an air outlet pipe 23 and a steamer (not shown in the figure), wherein the sealing cover 22 is simultaneously connected with the air inlet pipe 21 and the air outlet pipe 23, and one end of the air inlet pipe 21, which is far away from the sealing cover 22, is communicated with the steamer.

The sealing cover 22 is used for sealing the meal box 5 containing food, and high-temperature steam output by the steam engine can be conveyed into the meal box 5 through the air inlet pipe 21 to heat the food in the meal box 5 so as to cook the food.

The sealing cover 22 is in a hat shape and is used for sealing the meal box 5 filled with food in the cooker 100 so that the food in the meal box 5 can be rapidly heated by the high-temperature steam.

Referring to fig. 3, the sealing cover 22 includes a cover 221, a flange 222, a rib 223, a sealing ring 224, and a heating bar 225, the flange 222 is disposed along a circumferential edge of the cover 221, the rib 223 connects the cover 221 and the flange 222 to reinforce the flange 222, and the flange 222 is not easily deformed when the sealing cover 22 presses down the lunch box 5.

The sealing ring 224 is sleeved on the flange 222, and the sealing ring 224 is used for sealing the lunch box 5, so that high-temperature steam in the lunch box 5 is prevented from leaking out to influence the heating efficiency.

Referring to fig. 4, a heating rod 225 is disposed in the sealing cover 22, the heating rod 225 is connected to the sealing cover 22, and the heating rod 225 communicates with the air inlet tube 21. A plurality of air outlet holes 2251 are formed in the portion of the heating rod 225 extending into the lunch box 5, an air inlet channel 2252 is formed in the heating rod 225, the air outlet holes 2251 are all communicated with the air inlet channel 2252, and the air inlet channel 2252 is communicated with the air inlet pipe 21. The high-temperature steam delivered from the inlet pipe 21 can be discharged into the lunch box 5 sealed by the sealing cover 22 through the inlet passage 2252 and the outlet hole 2251 in sequence.

The plurality of air outlet holes 2251 are spaced along the side of the heating rod 225, and the heating rod 225 can be inserted into the lunch box 5 and sufficiently contact with the food in the lunch box 5. The high temperature steam can be delivered from the plurality of air outlet holes 2251 to sufficiently heat the food in the lunch box 5, the heating efficiency is high, and the food is easily cooked.

The cooking assembly 2 further comprises a cooler (not shown in the figures) which communicates with the inlet conduit 21 via a pipe. When the steam engine stops outputting high-temperature steam in the lunch box 5, the cooler can convey a small amount of cold air in the lunch box 5 through the air inlet pipe 21 to properly cool the food in the lunch box 5, the user can eat immediately after taking the meal, the user does not need to wait for cooling the food for a long time because the temperature of the food is too high, and the user has a good experience feeling when having a meal.

Referring to fig. 3, the cooking assembly 2 further includes a driving cylinder 24 and a buffer spring 25, the driving cylinder 24 is disposed on the machine platform 1, and the buffer spring 25 is connected to the driving cylinder 24 and the sealing cover 22. The driving cylinder 24 drives the sealing cover 22 to press down and seal the lunch box 5 containing food, and in the process, the buffer spring 25 is compressed to accumulate elastic force. The deformation of the lunch box 5 by the rigid force of the sealing cover 22 can be prevented by the buffer action of the buffer spring 25.

The control assembly 3 includes a control terminal (not shown), a controller (not shown) and a temperature monitor 31, and the control terminal and the temperature monitor 31 are electrically connected with the controller.

The control terminal may be an electronic device, such as a mobile phone or a remote controller, or an operation panel disposed on the machine. The controller can be understood as a common control circuit board, and the temperature monitor 31 is disposed at the exhaust pipe 23 and near the sealing cover 22. The temperature monitor 31 is used for monitoring the temperature of the high-temperature steam passing through the exhaust duct 23 after heating the food in the lunch box 5, wherein the high-temperature steam is the high-temperature steam exhausted from the lunch box 5 after heating the food.

Before the steamer heats, the temperature monitor 31 is turned to off state, and then the steamer is started to input high temperature steam to the lunch box 5 for heating. After X seconds of heating, the temperature monitor 31 is turned on to start monitoring the temperature, which is defined as the first post-temperature. X is 20-40 and can be set according to the food to be heated.

The controller is also electrically connected to the steamer, when the first rear temperature monitored by the temperature monitor 31 is higher than or equal to the first preset temperature of the temperature monitor 31, the temperature monitor 31 generates a first sensing signal and transmits the first sensing signal to the controller, and the controller controls the steamer to continue heating for Y seconds and then immediately stops outputting high-temperature steam for heating in the lunch box 5, so as to ensure that the food in the lunch box 5 is completely cooked. Wherein Y is 50-70, Y in this embodiment is 60, the specific value of X can be set by oneself, and for some foods which are difficult to cook, Y can be set to be larger properly.

The first predetermined temperature may be 95-99 deg.c, and in one embodiment, the first predetermined temperature is 98 deg.c. When the food is heated, most of the heat of the high-temperature steam is absorbed by the food and the cold water in the lunch box 5 needs to absorb heat to boil, so the temperature of the residual steam just before the discharge from the exhaust pipe 23 is not too high, and the first post-temperature detected by the temperature detector 31 is far from the first preset temperature. When the food is almost cooked, the temperature of the residual steam discharged from the exhaust pipe 23 gradually increases until it exceeds 98 ℃, and the temperature monitor 31 generates a first sensing signal when the food in the lunch box 5 is almost cooked.

Foretell cooler electric connection is in the controller, and when controller control steam engine stop work, the controller is controlled the cooler immediately and is begun work, to carrying air conditioning in the cutlery box 5 to suitably cool down food, the user need not to wait for food cooling, can eat, has improved the experience sense that the user had a meal.

Note that the cold air sent from the cooler is also sent to the lunch box 5 through the air outlet 2251 of the heating rod 225. Since the air outlet 2251 is completely submerged below the level of the soup in the lunch box 5, the cold air will not be directly exhausted from the exhaust pipe 23 to affect the monitoring of the temperature monitor 31.

The cooler conveys cold air into the lunch box 5 at a third preset temperature, the third preset temperature is 1-5 ℃, the specific temperature of the third preset temperature can be adjusted according to the required time length for cooling food, for example, for some food which needs to be cooled for a long time, the third preset temperature can be properly adjusted to be low.

After the heating of the lunch box 5 is stopped, the temperature monitor 31 continues to monitor the post temperature, and the post temperature monitored again is defined as the second post temperature.

When the second rear temperature monitored by the temperature monitor 31 is lower than or equal to the second preset temperature of the temperature monitor 31, the temperature monitor 31 generates a second sensing signal and transmits the second sensing signal to the controller, and the controller controls the sealing cover 22 to open, so as to prevent the sealing cover 22 from being opened in advance to easily cause the soup in the lunch box 5 to overflow or the lunch box to explode.

The temperature of the high-temperature steam output by the steam engine is 220-350 ℃, the second preset temperature is 75-80 ℃, and in one embodiment, the temperature of the high-temperature steam output by the steam engine is 280 ℃ and the second preset temperature is 78 ℃. It is understood that in other embodiments, the specific ranges of the high temperature steam temperature and the second preset temperature may be appropriately adjusted according to the actual heated food objects. For example, the high-temperature steam temperature may be appropriately increased and the second preset temperature may be appropriately decreased for food that is difficult to cook, such as raw meat, so that the cooking time may be shortened. For the foods such as noodles and vermicelli which are easy to cook, the temperature of the high-temperature steam can be properly reduced, the second preset temperature can be properly increased, and the situation that the lunch box 5 is easy to explode due to overheating can be avoided.

The recovery unit 4 serves to recover residual high-temperature steam discharged from the exhaust pipe 23.

Referring to fig. 2, the recycling assembly 4 includes a transfer member 41, a water supply member 42, a recycling tank 43 and a water pump 44, wherein the transfer member 41 is connected to the water supply member 42, the water pump 44 is connected to the recycling tank 43 and the water supply member 42, and the transfer member 41 is communicated with the recycling tank 43.

The exhaust pipe 23 is connected to the sealing cover 22, and when the sealing cover 22 seals the lunch box 5, the exhaust pipe 23 can be communicated with the lunch box 5, so that after the high-temperature steam heats the food in the lunch box 5, the high-temperature steam can be exhausted to the transfer part 41 through the exhaust pipe 23.

The transfer member 41 includes a first end 411 and a second end 412 along the length extension direction, wherein the first end 411 is open, and the second end 412 is used for connecting the water supply member 42. The relay member 41 is provided with a relay passage 413, and the relay passage 413 is communicated with the exhaust pipe 23 to receive the high-temperature steam from the exhaust pipe 23. The first end 411 of the relay member 41 faces the recycling tank 43, and the high-temperature steam can flow into the recycling tank 43 through the first end 411 to be recycled after being cooled to form water in the relay passage 413.

The connection position of the exhaust pipe 23 and the relay member 41 is located between the first end 411 and the second end 412 and near the second end 412, so that the high-temperature steam can stay in the relay passage 413 for a longer time, and can be cooled more sufficiently, thereby forming steam or water.

The water supply member 42 is disposed at the second end 412 of the transfer member 41, the water supply member 42 is used for connecting a water source and spraying water to the transfer passage 413 so as to cool the high-temperature steam in the transfer passage 413, so that the high-temperature steam is liquefied into steam or water, and the water falls into the recovery tank 43 through gravity.

The recycling tank 43 is a hollow box with an opening facing the first end 411 of the transferring member 41, and the first end 411 may or may not extend into the recycling tank 43. In this embodiment, the first end 411 of the transferring member 41 does not extend into the recycling tank 43, and is disposed near the opening of the recycling tank 43, so as to prevent the water in the transferring passage 413 from spilling out of the recycling tank 43, and prevent the excessive water in the recycling tank 43 from flooding the first end 411 of the transferring member 41.

The water supply member 42 includes a shower head 421, the shower head 421 is disposed at a position of the transfer passage 413 near the second end 412, and the position of the shower head 421 is higher than the connection position of the exhaust pipe 23 and the transfer member 41. The shower head 421 can provide a wider water spraying area, so that high-temperature steam can be fully contacted with cold water, and the temperature can be rapidly reduced and liquefied.

One end of the water pump 44 is connected to the water supply member 42 through a water supply pipe 441, and the other end of the water pump 44 is connected to the recovery tank 43 through a water suction pipe 442. The water pump 44 can drive the water in the recovery tank 43 to the water supply member 42, and the water is sprayed to the transit passage 413 through the water supply member 42, so as to cool and liquefy the high-temperature steam in the transit passage 413. The water in the recovery tank 43 can be recycled, so that water resources are saved, and the water supply member 42 is not required to be connected with a water supply faucet, so that the use is convenient.

The invention also provides a heating control method, which is applied to the cooking machine, and the heating control method is used for controlling the cooking machine to heat food, so that the food is completely cooked, the situation that the lunch box 5 containing the food is exploded is not easy to occur, and the smooth dining stability of the food is improved.

The heating control method comprises the following steps:

s1: an operator controls the control terminal, the controller is triggered through the control terminal, the controller controls the driving cylinder 24 to drive the sealing cover 22 to press downwards, the lunch box 5 is covered on the sealing cover, and the temperature monitor 31 is controlled to be in a closed state;

s2: starting the steamer, inputting high-temperature steam into the lunch box 5 through the air inlet pipe, and heating the food in the lunch box 5 for X seconds at high temperature, wherein X is 20-40.

S3: the temperature monitor 31 is controlled to be in an open state, and the monitoring of the temperature of the high-temperature steam passing through the exhaust pipe 23 is started, which is the first post temperature.

When the first rear temperature is greater than or equal to the first preset temperature of the temperature monitor 31, the temperature monitor 31 generates a first sensing signal and transmits the first sensing signal to the controller, and the controller controls the steam engine to continue heating for Y seconds and then immediately stops heating. Wherein Y is 50-70 and the first preset temperature is 98 ℃.

S4: the lunch box 5 is gradually cooled and the temperature monitor 31 continues to monitor the temperature of the high temperature steam passing through the discharge pipe, which is the second post temperature.

When the second rear temperature is lower than the second preset temperature of the temperature monitor 31, the temperature monitor 31 generates a second sensing signal and transmits the second sensing signal to the controller, the controller controls the driving cylinder 24 to drive the sealing cover 22 to rise, the sealing cover 22 is separated from the lunch box 5, and the food in the lunch box 5 is completely heated.

In an embodiment, after the step S3 is finished, the food in the lunch box 5 is cooled by the third preset temperature and lasts for the first preset time, so that the food in the lunch box 5 can be cooled quickly after being cooked, the eating time and the eating time of the consumer are greatly reduced, and the eating experience of the consumer is greatly improved.

The third preset temperature is 1-5 ℃, and the first preset time is five-ten seconds. The third preset temperature of the embodiment is 2 ℃, the first preset time is seven seconds, specific parameters of the third preset temperature and the first preset time can be set according to actual food, the third preset temperature can be set to be lower for some food which needs to be cooled for a long time, and the first preset time is set to be longer.

After the steam engine of the present invention passes through step S2, the first post temperature monitored by the temperature monitor 31 will usually be greater than the first preset temperature. There are sometimes accidents, however, such as for some foods that are difficult to cook, even after step S2 is completed, the first post temperature may be in a lower state.

When the first rear temperature is lower than the second preset temperature, the food in the lunch box 5 is continuously heated for A seconds, and the heating temperature of the steamer is increased to Q. And if the first post temperature is still lower than the first preset temperature after the heating is continuously performed for A seconds, continuing to cyclically perform the heating for A seconds until the first post temperature is not lower than the first preset temperature.

If the first rear temperature is higher than the second preset temperature and lower than the first preset temperature, the food in the lunch box is continuously heated for B seconds, and the heating temperature of the steam engine is increased to R. And if the first post temperature is still lower than the first preset temperature after the heating is continuously performed for B seconds, continuing to cyclically heat for B seconds until the first post temperature is not lower than the first preset temperature.

When the first post temperature is lower than the second preset temperature, the continuous heating time is longer, and the first post temperature can reach the first preset temperature earlier. Q is greater than R, when the first rear temperature is lower than the second preset temperature, higher heating temperature needs to be provided, and the first rear temperature can reach the first preset temperature earlier.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, substitutions and alterations can be made without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be subject to the claims.

Claims

1. A heating control method, characterized by comprising:

covering the lunch box by using a sealing cover;

heating the food in the meal box for X seconds;

monitoring a first post-temperature outside the meal box after heating food in the meal box;

monitoring a second post temperature outside the meal box after heating food in the meal box;

and if the second rear temperature is lower than or equal to the second preset temperature, separating the sealing cover and the lunch box.

2. The heating control method according to claim 1, wherein X is 30 and Y is 60.

3. The heating control method according to claim 2, characterized in that the first preset temperature is 98 ℃.

4. The heating control method according to claim 1, wherein the second preset temperature is 75 ℃ to 80 ℃.

5. The heating control method according to claim 1, wherein after the heating of the food in the box is stopped, the food in the box is cooled at a third preset temperature for a first preset time.

6. The heating control method according to claim 5, characterized in that the third preset temperature is 1 ℃ to 5 ℃ and the first preset time is five seconds to ten seconds.

7. The heating control method of claim 1, wherein if the first post-temperature is lower than the second pre-set temperature, the heating of the food in the lunch box is continued for a second; if the first rear temperature is higher than the second preset temperature and lower than the first preset temperature, continuing to heat the food in the lunch box for B seconds, wherein B is less than A.

8. A cooking machine, characterized in that it comprises:

a controller for implementing the heating control method according to any one of claims 1 to 7;

the steamer is connected with the controller and is used for heating food in the lunch box at a high temperature;

the sealing cover is used for sealing and covering the lunch box containing food;

the air inlet pipe is connected with the steam engine and the sealing cover so that high-temperature steam output by the steam engine is conveyed into the meal box through the air inlet pipe;

the exhaust pipe is communicated with the lunch box and used for exhausting high-temperature steam after the food in the lunch box is heated;

9. The cooking machine of claim 8, further comprising a cooler, wherein the cooler is connected to the controller and the air inlet pipe, and when the controller controls the steamer to stop delivering high-temperature steam, the cooler delivers cold air to the inside of the lunch box through the air inlet pipe to temporarily cool the inside of the lunch box.

10. The cooker of claim 8, further comprising a recycling device connected to the exhaust pipe for liquefying and recycling the high temperature steam discharged from the exhaust pipe into water.