Heat exchanger and using method thereof

Abstract

The invention discloses a heat exchanger and a using method thereof, and belongs to the technical field of heat exchangers, the heat exchanger comprises a heat exchanger body, the heat exchanger body comprises a tube pass and a shell pass, the shell pass is provided with a first water inlet and a first water outlet in a communicating manner, and the tube pass is provided with an air inlet and an air outlet in a communicating manner; the water supply tank is located below the heat exchanger body, a water pumping assembly is installed on the water supply tank and used for pumping water in the water supply tank into the shell pass, and a gas collecting assembly is arranged in the water supply tank and used for collecting gas with waste heat exhausted from the gas outlet. According to the heat exchanger, gas with heat output by the heat exchanger body can be collected by arranging the gas collecting assembly, heat in the gas collecting assembly can be absorbed by injecting water into the collecting box, and heat waste is reduced; according to the heat exchanger, water with substandard heat output by the heat exchanger body is injected into the collecting box again, and the water with substandard heat can be heated again.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat exchangers, and in particular relates to a heat exchanger and a method for using the same. Background Art

[0002] Heat exchangers are devices that transfer part of the heat of hot fluid to cold fluid, also known as heat exchangers. Heat exchangers play an important role in chemical, petroleum, power, food and many other industrial production. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators and reboilers, etc., and are widely used.

[0003] The water-gas heat exchanger inputs cold water and hot gas. The cold water absorbs the heat of the hot gas, which increases the output water temperature. However, the gas output from the water-gas heat exchanger may still contain a certain amount of heat. If it is directly discharged, it will cause energy waste. At the same time, the temperature of the output hot water is difficult to control. In order to solve the above problems, a heat exchanger and a method of using the same are provided.

[0004] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a device that can collect the hot gas output by the heat exchanger body by arranging a gas collecting component, absorb the heat in the gas collecting component by injecting water into the collecting box, increase the water temperature in the collecting box, and reduce the waste of heat.

[0006] To achieve the above-mentioned purpose, the present invention proposes a heat exchanger, including a heat exchanger body, the heat exchanger body including a tube side and a shell side, the shell side is connected to be provided with a first water inlet and a first water outlet, the tube side is connected to be provided with an air inlet and an air outlet, the heat exchanger also includes a water supply tank, the water supply tank is located below the heat exchanger body, a pumping assembly is installed on the water supply tank, the pumping assembly is used to pump water in the water supply tank into the shell side, an air collecting assembly is provided in the water supply tank, the air collecting assembly is used to collect the gas with waste heat discharged from the air outlet.

[0007] Temperature sensors are provided in the air outlet and the first water outlet.

[0008] Furthermore, the gas collecting assembly includes a plurality of gas collecting cylinders installed on the top plate of the water supply tank, the opening of the gas collecting cylinder is located outside the box body, the bottom of the gas collecting cylinder is located inside the box body, a piston is slidably provided inside the gas collecting cylinder, the bottom of the gas collecting cylinder is connected to a first air outlet pipe, a third solenoid valve is installed on the first air outlet pipe, a support frame is fixed to the gas collecting cylinder, a vertical electric push rod is fixed on the support frame, the electric push rod is located directly above the piston, a distance sensor is provided below the support frame for detecting the height of the piston, and the bottom of the gas collecting cylinder is connected to an air inlet pipe.

[0009] The gas collecting component also includes a second air outlet pipe connected to the air outlet, a fourth solenoid valve is installed on the second air outlet pipe, a third connecting pipe is connected to the air outlet, a fifth solenoid valve is installed on the third connecting pipe, a main pipe is connected to the third connecting pipe, the air inlet pipe is connected to the main pipe, and a sixth solenoid valve is installed on the air inlet pipe.

[0010] Furthermore, the first water outlet is connected to a water outlet pipe, a first solenoid valve is installed on the water supply pipe, the first water outlet is also connected to a first connecting pipe, the first connecting pipe is connected to the water supply tank, and a second solenoid valve is installed on the first connecting pipe.

[0011] Furthermore, the pumping assembly includes a water pump installed on one side of the water supply tank, the water pump is used to pump water from the water supply tank, and the water outlet on the water pump is installed with a second connecting pipe connected to the first water inlet.

[0012] Furthermore, the water supply tank includes a box body, in which a sixth partition is arranged, a vertical seventh partition is vertically arranged above one end of the sixth partition, the sixth partition is provided with a gap between one end of the seventh partition and the water supply tank, a gap is left between the upper end of the seventh partition and the water supply tank, and a second water inlet pipe is connected to the box body, and the second water inlet pipe is located above the sixth partition.

[0013] Furthermore, a horizontal first partition is fixed in the shell side, a notch is provided at one end of the first partition away from the tube side, and the first water inlet and the first water outlet are respectively located on both sides of the first partition.

[0014] A vertical fourth partition is provided between the tube side and the shell side.

[0015] Furthermore, a horizontal fifth partition is arranged in the tube pass, the air inlet and the air outlet are respectively located on both sides of the fifth partition, and a plurality of U-shaped tubes are arranged in the heat exchanger body, the U-shaped tubes are fixed on the fourth partition, and both ends of the U-shaped tubes are respectively located on both sides of the fifth partition.

[0016] Furthermore, vertical second partitions are provided on both inner walls of the shell side, third partitions are fixed on both sides of the first partition, and the second partitions and the third partitions are staggered.

[0017] Further, the method of use is as follows:

[0018] The third solenoid valve is opened to control the opening of the first air outlet pipe, and the piston is pushed to move by starting the electric push rod to discharge the gas under the piston in the gas collecting cylinder, and then the third solenoid valve is closed.

[0019] Start the water pump to pump the water in the box into the shell, and at the same time let the hot air in from the air inlet, and the hot air will be output from the air outlet after passing through the U-shaped tube.

[0020] When the value detected by the temperature sensor in the first water outlet is lower than the preset value, the second solenoid valve is closed and the first solenoid valve is opened, so that the hot water in the heat exchanger body is discharged from the water outlet pipe; when the value detected by the temperature sensor in the first water outlet is higher than the preset value, the second solenoid valve is opened and the first solenoid valve is closed, so that the hot water that does not meet the water temperature standard enters the water supply tank.

[0021] When the value detected by the temperature sensor in the air outlet is lower than the preset value, the fifth solenoid valve is closed and the fourth solenoid valve is opened, so that the gas in the heat exchanger body is discharged from the second air outlet pipe. When the value detected by the temperature sensor in the air outlet is higher than the preset value, the fifth solenoid valve is opened and the fourth solenoid valve is closed, so that the hot gas enters the main pipe, and the corresponding sixth solenoid valve is opened, so that the gas in the main pipe flows into the corresponding gas collecting cylinder, thereby pushing the piston to rise. The rise of the piston is judged to be higher than the preset value by the detection distance of the distance sensor. When it reaches the preset value, the corresponding sixth solenoid valve is closed, and then other sixth solenoid valves are opened to inflate the corresponding gas collecting cylinder, and cold water is injected into the box through the second water inlet pipe. The cold water passes through all the gas collecting cylinders in turn and is discharged from the gap above the seventh partition to the bottom of the sixth partition. The cold water passes through the gas collecting cylinder, causing the piston inside it to drop. The distance detected by the distance sensor is used to judge the temperature of the gas. When the temperature reaches the preset value, the third solenoid valve is opened again, and the electric push rod is started to control the discharge of the gas in the gas collecting cylinder, waiting for gas collection again.

[0022] The heat exchanger and the use method thereof proposed by the present invention can bring the following beneficial effects:

[0023] 1. The heat exchanger of the present invention can collect the gas with heat output by the heat exchanger body by arranging a gas collecting component. By injecting water into the collecting box, the heat in the gas collecting component can be absorbed, the water temperature in the collecting box can be increased, and the waste of heat can be reduced;

[0024] 2. The heat exchanger of the present invention can reheat the water that does not meet the heat standard by injecting the water output by the heat exchanger body into the collection box again, so as to facilitate adjusting the water temperature output by the heat exchanger body according to needs;

[0025] 3. The heat exchanger of the present invention is provided with a distance sensor capable of detecting the height of the piston. On the one hand, it can determine the amount of gas according to the height of the piston when filling the gas into the gas collecting cylinder. On the other hand, it can determine the temperature of the gas in the gas collecting cylinder when cooling the gas collecting cylinder, thereby realizing multiple uses of one machine and saving equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 The figure is a schematic structural diagram of a heat exchanger of the present invention.

[0028] Figure 2 The figure is a schematic diagram of the cross-sectional structure of a heat exchanger of the present invention.

[0029] Figure 3 for Figure 2 Enlarged structural diagram at A in the middle.

[0030] Figure 4 for Figure 2 Enlarged structural diagram at B in the middle. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0032] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more schemes or examples in a suitable manner.

[0036] The embodiment of the present invention provides a heat exchanger, including a heat exchanger body 1, such as Figure 1 As shown, the heat exchanger body 1 includes a tube side 12 and a shell side 11 , the shell side 11 is connected with a first water inlet 17 and a first water outlet 18 , and the tube side 12 is connected with an air inlet 15 and an air outlet 16 .

[0037] The heat exchanger also includes a water supply tank 2, which is located below the heat exchanger body 1. A pumping assembly 4 is installed on the water supply tank 2, and the pumping assembly 4 is used to pump water in the water supply tank 2 into the shell side 11. An air collecting assembly 3 is provided in the water supply tank 2, and the air collecting assembly 3 is used to collect the gas with waste heat discharged from the outlet 16.

[0038] The first water outlet 18 is connected to a water outlet pipe 112 , and a first solenoid valve 113 is installed on the water supply pipe 112 . The first water outlet 18 is also connected to a first connecting pipe 114 , which is connected to the water supply tank 2 , and a second solenoid valve 115 is installed on the first connecting pipe 114 .

[0039] The pumping assembly 4 includes a water pump 41 installed on one side of the water supply tank 2 . The water pump 41 is used to pump water from the water supply tank 2 . A second connecting pipe 42 connected to the first water inlet 17 is installed at the water outlet of the water pump 41 .

[0040] A horizontal first baffle 19 is fixed in the shell side 11. Figure 2 As shown, a notch is provided at one end of the first partition plate 19 away from the tube side 12 , and the first water inlet 17 and the first water outlet 18 are respectively located on both sides of the first partition plate 19 .

[0041] A vertical fourth partition 13 is provided between the tube side 12 and the shell side 11, vertical second partitions 111 are provided on both inner walls of the shell side 11, third partitions are fixed on both sides of the first partition 19, and the second partitions 111 and the third partitions are staggered.

[0042] A horizontal fifth partition 14 is arranged in the tube pass 12, and the air inlet 15 and the air outlet 16 are respectively located on both sides of the fifth partition 14, and a plurality of U-shaped tubes 110 are arranged in the heat exchanger body 1, and the U-shaped tubes 110 are fixed on the fourth partition 13, and the two ends of the U-shaped tubes 110 are respectively located on both sides of the fifth partition 14.

[0043] The water supply tank 2 includes a box body 21, a sixth partition 22 is arranged in the box body 21, a vertical seventh partition 23 is vertically arranged above one end of the sixth partition 22, a gap is left between the end of the sixth partition 22 provided with the seventh partition 23 and the water supply tank 2, and a gap is left between the upper end of the seventh partition 23 and the water supply tank 2, and a second water inlet pipe 24 is connected to the box body 21, such as Figure 3 As shown, the second water inlet pipe is located above the sixth partition plate 22.

[0044] The gas collecting assembly 3 includes a plurality of gas collecting cylinders 31 installed on the top plate of the water supply tank 2, the opening of the gas collecting cylinder 31 is located outside the box body 21, the bottom of the gas collecting cylinder 31 is located inside the box body 21, a piston 32 is slidably provided inside the gas collecting cylinder 31, the bottom of the gas collecting cylinder 31 is connected to a first air outlet pipe 33, a third solenoid valve 34 is installed on the first air outlet pipe 33, a support frame 35 is fixed to the gas collecting cylinder 31, a vertical electric push rod 36 is fixed to the support frame 35, the electric push rod 36 is located directly above the piston 32, a distance sensor 37 is provided below the support frame 35 for detecting the height of the piston 32, the distance sensor 37 is electrically connected to a preset control system, and the bottom of the gas collecting cylinder 31 is connected to an air inlet pipe 313.

[0045] The gas collecting assembly 3 also includes a second air outlet pipe 38 connected to the air outlet 16, on which a fourth solenoid valve 39 is installed, a third connecting pipe 310 is connected to the air outlet 16, on which a fifth solenoid valve 311 is installed, a main pipe 312 is connected to the third connecting pipe 310, an air inlet pipe 313 is connected to the main pipe 312, and a sixth solenoid valve 314 is installed on the air inlet pipe 313.

[0046] Temperature sensors are provided in the air outlet 16 and the first water outlet 18 .

[0047] A method for using a heat exchanger, the method of using is as follows:

[0048] The third solenoid valve 34 is opened to control the first gas outlet pipe 33 to open, and the piston 32 is pushed to move by starting the electric push rod 36 to discharge the gas below the piston in the gas collecting cylinder 31, and then the third solenoid valve 34 is closed.

[0049] The water pump 41 is started to pump the water in the box body 21 into the shell side 11 , and at the same time, hot air is introduced from the air inlet 15 , and the hot air passes through the U-shaped tube 110 and is output from the air outlet 16 .

[0050] When the value detected by the temperature sensor in the first water outlet 18 is lower than the preset value, the second solenoid valve 115 is closed and the first solenoid valve 113 is opened, so that the hot water in the heat exchanger body 1 is discharged from the water outlet pipe 112; when the value detected by the temperature sensor in the first water outlet 18 is higher than the preset value, the second solenoid valve 115 is opened and the first solenoid valve 113 is closed, so that the hot water with substandard water temperature enters the water supply tank 2, so as to facilitate subsequent heating.

[0051] When the value detected by the temperature sensor in the air outlet 16 is lower than the preset value, the fifth solenoid valve 311 is closed and the fourth solenoid valve 39 is opened, so that the gas in the heat exchanger body 1 is discharged from the second air outlet pipe 38. When the value detected by the temperature sensor in the air outlet 16 is higher than the preset value, the fifth solenoid valve 311 is opened, the fourth solenoid valve 39 is closed, so that the hot gas enters the main pipe 312, and the corresponding sixth solenoid valve 314 is opened, so that the gas in the main pipe 312 flows into the corresponding gas collecting cylinder 31, thereby pushing the piston 32 to rise. The detection distance of the distance sensor 37 determines that the rise of the piston 32 is higher than the preset value. When it reaches the preset value, the corresponding sixth solenoid valve 314 is closed, and then Then, open the other sixth solenoid valve 314 to inflate the corresponding gas collecting cylinder 31, and inject cold water into the box body 21 through the second water inlet pipe 24. The cold water passes through all the gas collecting cylinders 31 in turn and is discharged from the gap above the seventh partition 23 to the bottom of the sixth partition 22. The cold water passes through the gas collecting cylinder 31 to cool the gas therein. At the same time, the water flowing through the gas collecting cylinder 31 will be heated. The pressure below the piston in the gas collecting cylinder 31 decreases, and the piston 32 moves down. The distance detected by the distance sensor 37 is used to judge the temperature of the gas. When the temperature reaches the preset value, open the third solenoid valve 34 again, start the electric push rod 36, control the gas in the gas collecting cylinder 31 to discharge, and wait for gas collection again.

[0052] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0053] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A heat exchanger, comprising a heat exchanger body (1), the heat exchanger body (1) comprising a tube side (12) and a shell side (11), the shell side (11) being connected with a first water inlet (17) and a first water outlet (18), and the tube side (12) being connected with an air inlet (15) and an air outlet (16), characterized in that: The heat exchanger further comprises a water supply tank (2), the water supply tank (2) being located below the heat exchanger body (1), a water pumping assembly (4) being installed on the water supply tank (2), the water pumping assembly (4) being used to pump water in the water supply tank (2) into the shell side (11), a gas collecting assembly (3) being provided in the water supply tank (2), the gas collecting assembly (3) being used to collect gas with residual heat discharged from the gas outlet (16); Temperature sensors are provided in the air outlet (16) and the first water outlet (18).

2. A heat exchanger according to claim 1, characterized in that: The gas collecting assembly (3) comprises a plurality of gas collecting cylinders (31) mounted on the top plate of the water supply box (2), the opening of the gas collecting cylinder (31) is located outside the box body (21), the bottom of the gas collecting cylinder (31) is located inside the box body (21), a piston (32) is slidably arranged inside the gas collecting cylinder (31), the bottom of the gas collecting cylinder (31) is connected to a first gas outlet pipe (33), a third solenoid valve (34) is installed on the first gas outlet pipe (33), a support frame (35) is fixed on the gas collecting cylinder (31), a vertical electric push rod (36) is fixed on the support frame (35), the electric push rod (36) is located directly above the piston (32), a distance sensor (37) for detecting the height of the piston (32) is located below the support frame (35), and an air inlet pipe (313) is connected to the bottom of the gas collecting cylinder (31); The gas collecting assembly (3) further comprises a second gas outlet pipe (38) connected to the gas outlet (16), a fourth solenoid valve (39) being installed on the second gas outlet pipe, a third connecting pipe (310) being connected to the gas outlet (16), a fifth solenoid valve (311) being installed on the third connecting pipe (310), a main pipe (312) being connected to the third connecting pipe (310), an air inlet pipe (313) being connected to the main pipe (312), and a sixth solenoid valve (314) being installed on the air inlet pipe (313).

3. A heat exchanger according to claim 2, characterized in that: The first water outlet (18) is connected to a water outlet pipe (112), a first solenoid valve (113) is installed on the water delivery pipe (112), the first water outlet (18) is also connected to a first connecting pipe (114), the first connecting pipe (114) is connected to the water supply tank (2), and a second solenoid valve (115) is installed on the first connecting pipe (114).

4. A heat exchanger according to claim 3, characterized in that: The water pumping assembly (4) comprises a water pump (41) installed on one side of the water supply tank (2), the water pump (41) being used to pump water from the water supply tank (2), and a second connecting pipe (42) connected to the first water inlet (17) being installed at the water outlet of the water pump (41).

5. A heat exchanger according to claim 4, characterized in that: The water supply box (2) comprises a box body (21), a sixth partition (22) is arranged inside the box body (21), a vertical seventh partition (23) is vertically arranged above one end of the sixth partition (22), a gap is left between the end of the sixth partition (22) provided with the seventh partition (23) and the water supply box (2), a gap is left between the upper end of the seventh partition (23) and the water supply box (2), and a second water inlet pipe (24) is connected to the box body (21), and the second water inlet pipe is located above the sixth partition (22).

6. A heat exchanger according to claim 5, characterized in that: A horizontal first baffle (19) is fixed in the shell side (11), a notch is provided at one end of the first baffle (19) away from the tube side (12), and a first water inlet (17) and a first water outlet (18) are respectively located on both sides of the first baffle (19); A vertical fourth partition plate (13) is provided between the tube side (12) and the shell side (11).

7. A heat exchanger according to claim 6, characterized in that: A fifth horizontal partition (14) is arranged in the tube side (12), and an air inlet (15) and an air outlet (16) are respectively located on both sides of the fifth partition (14). A plurality of U-shaped tubes (110) are arranged in the heat exchanger body (1), and the U-shaped tubes (110) are fixed on the fourth partition (13), and two ends of the U-shaped tubes (110) are respectively located on both sides of the fifth partition (14).

8. A heat exchanger according to claim 7, characterized in that: The inner walls on both sides of the shell side (11) are provided with vertical second partitions (111), and third partitions are fixed on both sides of the first partition (19), and the second partitions (111) and the third partitions are arranged in an alternating manner.

9. The method for using a heat exchanger according to claim 8, characterized in that: The method of use is as follows: The third solenoid valve (34) is opened to control the first gas outlet pipe (33) to open, and the piston (32) is pushed to move by starting the electric push rod (36) to discharge the gas below the piston in the gas collecting cylinder (31), and then the third solenoid valve (34) is closed; The water pump (41) is started to pump water in the housing (21) into the shell side (11), and hot air is introduced from the air inlet (15). The hot air passes through the U-shaped tube (110) and is discharged from the air outlet (16); When the value detected by the temperature sensor in the first water outlet (18) is lower than a preset value, the second solenoid valve (115) is closed and the first solenoid valve (113) is opened, so that the hot water in the heat exchanger body (1) is discharged from the water outlet pipe (112); when the value detected by the temperature sensor in the first water outlet (18) is higher than the preset value, the second solenoid valve (115) is opened and the first solenoid valve (113) is closed, so that the hot water that does not meet the water temperature standard enters the water supply tank (2); When the value detected by the temperature sensor in the air outlet (16) is lower than a preset value, the fifth solenoid valve (311) is closed and the fourth solenoid valve (39) is opened, so that the gas in the heat exchanger body (1) is discharged from the second air outlet pipe (38); when the value detected by the temperature sensor in the air outlet (16) is higher than a preset value, the fifth solenoid valve (311) is opened and the fourth solenoid valve (39) is closed, so that the hot gas enters the main pipe (312); the corresponding sixth solenoid valve (314) is opened, so that the gas in the main pipe (312) flows into the corresponding gas collecting cylinder (31), thereby pushing the piston (32) up. The rise of the piston (32) is judged to be higher than the detection distance of the distance sensor (37). When the value reaches When the preset value is reached, the corresponding sixth solenoid valve (314) is closed, and then other sixth solenoid valves (314) are opened to inflate the corresponding gas collecting cylinder (31), and cold water is injected into the box body (21) through the second water inlet pipe (24). The cold water passes through all the gas collecting cylinders (31) in turn and is discharged from the gap above the seventh partition (23) to the bottom of the sixth partition (22). The cold water passes through the gas collecting cylinder (31) so that the piston (32) therein descends, and the temperature of the gas is judged by the distance detected by the distance sensor (37). When the temperature reaches the preset value, the third solenoid valve (34) is opened again, and the electric push rod (36) is started to control the gas in the gas collecting cylinder (31) to be discharged, and wait for gas to be collected again.

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