KR101829727B1 - Nano bubble generator - Google Patents

Abstract

The present invention relates to a nano bubble generating device, and more particularly, to a nano bubble generating device that generates bubbles of very small particles of 10 μm or less using a micro bubble generator, The nano bubbles are emitted from each of the region and the remote region and the gas introduced from the outside is lowered through heat exchange so that the temperature of the region where the nano bubble is emitted can be lowered.

Description

NANO BUBBLE GENERATOR [0002]

The present invention relates to a nano bubble generating device, and more particularly, to a nano bubble generating device that generates bubbles of very small particles of 10 μm or less using a micro bubble generator, The nano bubbles are emitted from each of the region and the remote region and the gas introduced from the outside is lowered through heat exchange so that the temperature of the region where the nano bubble is emitted can be lowered.

Generally, a micro bubble is a bubble having a diameter of 50 탆 or less, a micro-nano bubble is 300 nm to 3 탆, and a nano bubble is a micro-bubble having a diameter of 100 nm or less.

Here, 'micro bubble' is a very fine bubble of 1 / 100th of a millimeter to 1/1000th of a millimeter, that is, 50 .mu.m or less, and occurs when water and air are vigorously rotated. The microbubble rises to the surface at a very slow rate of 0.1 cm / sec. In addition, 'nano bubbles' refers to very small bubbles of less than 10 μm produced by using only water and air coming out through a specially manufactured micro bubble generator. At this time, the bubble refers to a bubble, that is, a gas pocket present in the liquid.

Such nano bubbles are currently used in many fields from hot spring bathing to cancer diagnosis in Japan. The development of microbubble generation technology was developed in Japan by Professor Daisai of Tokuyama High School in 1995, the first in the world. Professor Daisai has focused his attention on various aspects such as applying microbubbles to oyster farms affected by red tide in 1998 and accomplishing great achievements.

These nano bubbles have different characteristics from ordinary bubbles in the following three aspects.

First, ordinary bubbles with a size or diameter of several millimeters or more in the liquid float up on the surface of the liquid at the same time as they are produced. The reason that the bubble floats up is because the buoyancy of the bubble is larger than the resistance of the liquid. On the other hand, nano bubbles stay in the liquid for a long time. This is because the buoyant force of the nano bubble is so small that it can not overcome the resistance of the liquid.

Second, when the nano bubble stays in the liquid for a long time, the gas inside the nano bubble gradually dissolves into the liquid through the surface and gradually becomes smaller in size. Furthermore, when the gas in the nano bubble has a high solubility in the liquid, the bubble itself may completely dissolve and disappear.

Third, the smaller the bubble size, the larger the ratio of the surface area to the volume, so that the gas inside the nano bubble dissolves into the liquid and the efficiency becomes higher.

These three characteristics of the nano bubble enable various applications. In the case of water treatment, it is possible to shorten the treatment time by increasing the water quality by effectively injecting air into the water. In the case of sewage treatment, for example, Effective injection of strong gas into the sewage opens a way to effectively decompose and remove various odor substances dissolved in sewage.

BACKGROUND ART [0002] Techniques related to the conventional micro-bubble generator include a method of collision through high-pressure injection, a method of passing through a fine mesh, and a micro-bubble generator using a rapid expansion tube using an orifice tube. Related arts have an advantage in that fine bubbles are generated through a very simple structure. However, the micro bubbles are large in size, so that they float easily due to buoyancy, and the size of the particles is unstable.

For example, a conventional micro-bubble generating device has a tubular portion in which a suction port and a discharge port are connected in a straight line. The tubular portion has a large suction port, narrowed gradually, narrowest in the middle and gradually widened, Diameter pipe for supplying compressed air is connected to the intermediate portion of the suction port of the tubular portion so as to be flowable and further includes an air compressor for supplying compressed air and a pump for compressing and supplying water, There is.

The conventional micro bubble generator having such a structure is advantageous in that the air bubble in the water is compressed and then suddenly diffused, so that it is split into a very small size to generate micro bubbles. However, the size of the fine bubbles produced by this method is much smaller than the nano size, which is much more than a few micrometers, and the homogeneity of the large bubbles is as small as several millimeters.

Meanwhile, among other examples of the conventional minute bubble generator, a method of generating minute bubbles using a high-speed rotary plate by using a motor has been disclosed in Korean Patent Nos. KR 10-1125851, KR 10-1137050, and KR 10-1146040, However, this is merely a matter of generating minute bubbles. Even if the diameter of the bubbles is small, it is more than several micrometers larger than the nano size, and the distribution is also large There is a problem that the efficiency of dissolving the gas in the liquid is low because the homogeneity is greatly reduced to the extent of several millimeters.

The conventional microbubbles or microbubbles or nano bubbles are also applied to a field for removing harmful algae. In this case, since the part where the bubble is injected is injected into the water without spraying directly to the place where the algae are located, There is a problem in that the direct action is not performed on the water, and when the water temperature is high, the oxygen saturation is low and the harmful algae removal efficiency is low.

The present invention has been made in view of the above problems of the prior art, and it is an object of the present invention to provide a nano bubble generating device and a method of manufacturing a nano bubble generating device by generating bubbles of very small particles of 10 탆 or less using a micro bubble generator, It is another object of the present invention to provide a nano bubble generating device capable of reducing the temperature of a region where nano bubbles are emitted by reducing the temperature of the gas introduced from the outside through heat exchange, have.

In order to achieve the above object, the present invention provides a nano bubble generator (100) for generating nano bubbles by introducing a gas and a fluid into an impeller-type aeration device, And generates pressure and velocity on the flow path of the gas and the fluid to generate the nano bubbles by splitting or blasting the introduced gas and the fluid, while generating the thrust (thrust) A first bubble generator 110 for radially discharging the generated nano bubbles directly from the main body of the nano bubble generator 100 and a second bubble generator 110 for generating a pressure change again on the discharge path, And a second bubble generator 120 for discharging the second bubble generator 120 with a relatively strong pressure to a long distance.

The present invention further includes a cooling unit 160 for lowering the temperature of the gas through heat exchange on the path through which the gas or the fluid flows or the path through which the gas and the fluid flow.

According to the present invention, the first bubble generator 110 and the second bubble generator 120 are provided on the same axis as the rotation axis of the driving unit M, The generated bubbles are radiated directly from the main body of the nano bubble generator 100. The second bubble generator 120 induces a pressure change again on the discharge path of the nano bubble, The nano bubbles can be generated and discharged at a distance greater than that of the generator 110 by a relatively strong pressure so that the utilization and efficiency of the nano bubble can be increased.

As described above, the present invention in which the utilization and efficiency of nano bubbles are increased is described as an embodiment of the present invention in which noxious birds are spread, lakes, marshes, ponds, rivers, cooling towers, irrigation channels, farms, sewage treatment plants, The nano bubbles generated by the first bubble generator 110 can be radiated directly from the main body of the nano bubble generator 100 so that the nano bubbles can be radiated directly or indirectly to the harmful birds. The nano bubbles are allowed to act directly on the portion adjacent to the harmful alga and the nano bubbles act on the entire region where the harmful algae are diffused by releasing the nano bubbles from the long distance, The effect of increasing the removal efficiency is obtained.

In addition, the present invention uses the cooling unit 160 to lower the temperature of the gas and / or the fluid through heat exchange on the path through which the gas or the fluid is supplied or with the gas and the fluid, By lowering the temperature, the water temperature in the entire region where the nano bubbles are emitted is reduced, thereby increasing the oxygen saturation, thereby enhancing the removal efficiency of harmful algae.

1 is a perspective view showing a configuration according to an embodiment of the present invention;
FIG. 2 is an exploded perspective view showing the first and second bubble generation units in more detail according to an embodiment of the present invention; FIG.
FIG. 3 is an exploded perspective view illustrating the entire structure according to an embodiment of the present invention in more detail; FIG.
4 is a cross-sectional view illustrating in detail a configuration according to an embodiment of the present invention.
FIG. 5 is a state diagram illustrating the state and operation of applying the present invention to a region (for example, a lake) where a harmful algae is diffused.
6 is a partial structural view showing an example in which a cooling unit is applied to the present invention;
7 is a partial cross-sectional view showing an example of a discharge means of the second bubble generator in the present invention.
8 is a cross-sectional view showing another example of the present invention.

The present invention will now be described with reference to the accompanying drawings.

First, as shown in FIGS. 1 to 4, a nano bubble generator 100 according to the present invention includes a nano bubble generator 100 for generating a nano bubble by flowing a gas and a fluid into an impeller- And generates a thrust force while interlocking and rotating in a state of being independently coaxial with the rotation axis L of the driving unit M. While generating a thrust force, the pressure and the velocity change on the flow path of the gas and the fluid are generated, A first bubble generator 110 for generating nano bubbles by mixing and exploding the gas and the fluid to generate nano bubbles, and radially discharging the generated nano bubbles directly from the main body of the nano bubble generator 100; And a second bubble generator 120 for generating a pressure change and discharging the bubble generator 110 at a relatively higher pressure than that of the first bubble generator 110.

Here, the driving unit M of the present invention may be a motor in which only the rotating shaft L is exposed at one side in a state of being drawn into the housing 130.

The driving unit M is connected to an external power supply unit (a power supply unit for switching and supplying a commercial power supply to the operation power supply) and supplied with power, and is also provided with control means , A liquid crystal display window, a microprocessor incorporating an operation-related program (not shown), and the like).

The driving unit M is connected to a power supply unit (a battery (rechargeable battery), a power supply circuit) provided in the housing 130 and operates by receiving power. , A liquid crystal display window, a microprocessor incorporating an operation-related program (not shown), and the like).

At this time, the motor serving as the driving unit M rotates at 3600 rpm, and may be accelerated 1.5 times through an accelerator (for example, an array of gear groups). (The amount and fineness of the nano- )

At this time, the housing 130 may be waterproofed through airtightness means such as packing, and the operation panel and the liquid crystal display window of the control means may be exposed to the outside in a state of being waterproof (waterproof film or blocking cap) Lt; / RTI >

In the meantime, the first bubble generator 110 of the present invention includes a protector 111 formed of an annular body fixed to a flange provided at one end (rotation axis direction) of the housing 130, and having a long hole in its outer diameter; The impeller 1 (112) is fixed to an intermediate portion of the rotating shaft (L) in a state of being accommodated in the protection hole (111), generates thrust through rotation, generates a nano bubble by mixing and blasting the inflowing gas and the fluid, ). ≪ / RTI >

The protector 111 is formed with flanges at both ends to provide a fixing part between the housing 130 and the second bubble generator 120. The protrusion 111 has a rectangular shape with a plurality of long slots ) May be provided.

In addition, the impeller 1 (112) comprises a rotating body 1 (112a) having a single open-end housing shape having micropores (112b) formed on its outer diameter and fixed to the rotating shaft (L); And a plurality of crescent-shaped blades 112c extending from a central portion of the rotating body 1 112a to which the rotation axis L is fixed to come in contact with the inner diameter.

At this time, the blade 112c may be a block body having a height increasing from the central portion of the rotating body 112a toward the inner diameter, and may be integrated with the inner surface of the housing through welding or bolt fixing.

The second bubble generator 120 of the present invention is a dual annular body fixed to one end of the protector 111 constituting the first bubble generator 110, A housing 121 provided with an inlet path through which the gas and the fluid flow into the generating section 110, and a space for accommodating the impeller 2 122 at the other end; And is fixed to the tip of a rotating shaft L passing through the center of one side of the housing 121 in the state of being housed in the housing 121. Thrust is generated through rotation to divide the flowing gas and the fluid, An impeller 2 122 for generating and discharging the impeller 2; One end of the housing 121 is fixed to the housing space of the impeller 2 122 and the other end of the housing 121 extends in the direction in which the driving unit M is located to provide a path for releasing the nano- And a discharge pipe 123 for discharging the water.

The housing 121 has a plurality of fluid inflow holes 121a for introducing fluid and gas into the first bubble generator 110 and one end of an outer cylinder having at least one gas inlet 121b, L, the outer rim portion of the bent portion is fixed to the flange of the protective member 111, the other end of the outer rim is bent in the center direction and then bent again in parallel with the outer diameter And the end portion of the inner cylinder may be bent again to the central portion so as not to contact with the rotation axis L. [

The impeller 2 122 includes a disk-shaped rotating body 122a having a shaft fixing protrusion 122b protruded to fix a rotation axis L to a central portion of one side surface thereof; And a plurality of crescent-shaped blades 122c extending from the central portion provided with the shaft fixing protrusions 122b to the inner diameter.

At this time, the rotating body 2 (122a) may be made concave toward the center portion, and the blade (122c) may be a block body formed to be inclined along a concave inclined surface.

In addition, the discharge pipe 123 may be connected to a multi-stage pipe body having a smaller diameter, and a pressure change may be applied to a nano bubble discharged from a portion where the multi-stage pipe body is connected.

In the meantime, the present invention is characterized in that the second bubble generator 120 includes a partition wall 141 formed with a through hole 141a at the center fixed to a rim of the enclosure 121; The dome portion is provided with a plurality of fluid inflow holes 142a and at least one gas inflow port 142b for introducing fluid and gas into the second bubble generating portion 120, And a tip end closing part 140 including a car body 142 fixed to the partition wall 141. [

According to the present invention, the supply of gas to the first and second bubble generators 110 and 120 is performed by a gas inlet pipe 151 connected to a suction end of the intake means F for forcedly sucking outside air. A gas discharge pipe 1 152 extending in the direction of the impeller 1 112 in the first bubble generator 110 in a state connected to the exhaust end of the intake unit F; And a gas discharge pipe 2 153 extending in the direction of the impeller 2 122 in the second bubble generator 120 in a state connected to the exhaust end of the intake means F .

In order to explain the operation of the present invention constructed as described above, as shown in FIG. 5 of the accompanying drawings, a state in which a harmful algae is installed in a resort is described as follows.

The present invention is installed to float or swim in a lake, a marsh, a pond, a river, a cooling tower, an irrigation water, a farm, a sewage treatment plant, a drinking water reservoir, a swimming pool, And the driving unit M is connected to a power supply unit (a power supply unit for converting and supplying a commercial power supply to an operation power supply) provided outside and operates by being supplied with power, It is preferable to operate while being controlled by a separately provided control means (an operation panel, a liquid crystal display window, and a microprocessor incorporating an operation-related program (not shown)).

When the main power switch of the control means is turned on, electric power is supplied to the electrical components of the apparatus, so that the motor serving as the driving unit M rotates and the first, The impellers 1 and 2 (112 and 122) of the two bubble generating units 110 and 120 are rotated and power is also applied to the intake means F to suck the outside air.

The outside air forcedly sucked by the suction means F flows into the impeller 1 112 side of the first bubble generator 110 through the gas discharge pipe 1 152 and flows into the gas discharge pipe 2 (122) of the second bubble generator (120) through the first bubble generator (153).

At this time, the gas discharge pipe 1 (152) passes through a through hole (one end side of the outer tube of the housing 121 is bent and extends so as not to contact with the rotation axis L) Since the impeller 1 112 is located close to the front of the nut portion fixed to the rotation axis L, in a process of being discharged while being accelerated in a narrow gap between the tip portion of the gas discharge pipe 1 152 and the nut in the process of discharging the gas It produces pressure and velocity changes and at the same time cleaves or explodes and mixes with the fluid to create a fine bubble.

The gas discharge pipe 2 153 is provided with a gas inlet 142b (for example, a fixing nipple) fixed to the through hole of the carbody 142 constituting the tip end closing part 140 and a through hole (Not shown in the drawings) of the gas discharge pipe 2 (153) in the process of discharging the gas through the through hole (141a, 141a, the through hole not in contact with the rotation axis L) and located close to the tip end portion of the shaft fixing projection 122b of the impeller 2 It accelerates in a narrow gap between the tip end and the shaft fixing protrusion 122b, and causes a pressure and a velocity change in the process of discharging, and at the same time, splits or explodes and mixes with the fluid to generate a fine bubble.

The fine bubbles are micro bubbles having a size of 1/100 to 1/1000 mm, that is, bubbles of 50 μm or less.

At the same time, since the impeller 1 112 of the first bubble generator 110 rotates, the fluid, that is, the water of the lake, is sucked into the fluid inflow hole 121a of the housing 121 and flows between the outer cylinder and the inner cylinder Through which the outer cylinder body is folded and extended so as not to contact with the rotation axis L, is accelerated and mixed with the gas in the process of passing through the narrow aperture.

At the same time, the impeller 2 122 of the second bubble generator 120 rotates, so that fluid, that is, water in the lake is sucked into the fluid inlet hole 142a of the drum 142, Through the narrow through hole 141a while being accelerated and mixed with the gas.

As described above, the fine bubbles generated in the first bubble generator 110 are mixed with the fluid by the thrust of the impeller 1 112, and the fine bubbles generated in the first bubble generator 110, Bubbles are generated while being repeatedly subjected to pressure and speed changes while being split or exploded, and are discharged to the vicinity of the main body of the nano bubble generator 100.

As described above, in the process of mixing the fine bubbles generated by the second bubble generator 120 with the fluid by the thrust of the impeller 2 122, the fine bubbles are discharged from the discharge tube 123 Bubbles are generated while being cleaved or exploded while being repeatedly caused to undergo pressure and velocity changes repeatedly, and are strongly discharged to the rear of the nano bubble generating device 100.

The nano bubbles are ultrafine bubbles that can not be confirmed by eyes of 5 占 퐉 (micrometer, or micron, 1 占 퐉 = 0.001 mm) or less.

In other words, in the first and second bubble generators 110 and 120 of the nano bubble generator 100 of the present invention, air and water introduced due to the rotation of the ampere and the pressure of the discharge path, By forming a vortex in the water containing air, a large specific gravity is pushed outward by the centrifugal force and the air with a small specific gravity is pushed to the inner side to move.

As the water and the air move in this way, water collides with the fine particles while colliding with the water. In this crushing process, a pressure drop (negative pressure) region is generated, and air collides with the inflow of such air, Thereby maximizing the dissolution rate, thereby increasing the amount of dissolved oxygen in the lake itself and thereby improving the quality of the lake by proliferating (activating) aerobic bacteria (bacteria that cause self-purification).

The nano bubble generator 100 may further include a coil for electrically applying power to the interior of the first and second bubble generators 110 and 120 of the nano bubble generator 100 It is also preferable that water is passed through the nano bubble generator 100 when the power is applied, thereby allowing the water to pass through the magnetic field to have an activity.

In the above description, the term "having activity" means that hydroxyl ion (OH-) is generated in water to have anionic surface-active property, thereby facilitating sterilization due to an electric field effect with a surfactant, Thereby improving the purification efficiency of the sediments.

The present invention may further include a cooling unit 160 for lowering the temperature of the gas through heat exchange on the gas supply unit 150, for example, the gas inlet pipe 151, as shown in FIG.

The cooling unit 160 may be a refrigerant circulation type cooling water single unit including a compressor in which a refrigerant circulates in an outer tube, and a gas inlet pipe 151 is provided in a zigzag manner and a Peltier device is stacked on both sides thereof. Of cooling water.

In this case, the gas to be sucked is made low in temperature and introduced into the first and second bubble generators 110 and 120 to increase oxygen saturation during mixing with the fluid, while the temperature of the nano bubbles to be discharged or discharged To lower the surrounding water temperature and thereby to inhibit the diffusion of harmful algae (which can not propagate at lower temperatures).

7 (a) and 7 (b), the discharge tube 123 has a plurality of tubular bodies 123 'and 123' 'having different diameters, which are multistage-coupled in a slidable state, , And the elastic body (S) may be inserted between the engagement ends.

This increases the power of the driving unit M to increase the discharge or discharge intensity of the nano bubbles so that pressure is applied to the tip end of the small tube body 123 "inserted into one end of the large tube body 123 ' The elastic body S located between one end of the tube body 123 'having a large diameter is contracted and the tube body 123' 'having a small diameter is drawn out to extend the length thereof, so that the nano bubble can be discharged farther do.

The present invention is characterized in that the second bubble generator 120 is excluded so that the partition wall 141 which is the end finishing portion 140, the car body 142 and the gas discharge pipe 2 153 ) May be combined.

In this case, it is possible to provide a low-cost device with a reduced size and efficiency of the nano bubble generator 100, so that the consumer can select the product as needed.

The first bubble generator 110 and the second bubble generator 120 are independently provided on the same axis as the rotation axis of the driving unit M so that the first bubble generator 110 generates The second bubble generator 120 generates the first bubble generator 110 by inducing the pressure change again on the discharge path of the nano bubble. The first bubble generator 110 discharges the nano bubbles radially from the main body of the nano bubble generator 100, The nano bubbles are generated and discharged at a relatively higher pressure, thereby increasing the usability and efficiency of the nano bubble.

As described above, the present invention in which the utilization and efficiency of nano bubbles are increased is described as an embodiment of the present invention in which noxious birds are spread, lakes, marshes, ponds, rivers, cooling towers, irrigation channels, farms, sewage treatment plants, The nano bubbles generated by the first bubble generator 110 can be radiated directly from the main body of the nano bubble generator 100 so that the nano bubbles can be radiated directly or indirectly to the harmful birds. The nano bubbles are allowed to act directly on the portion adjacent to the harmful alga and the nano bubbles act on the entire region where the harmful algae are diffused by releasing the nano bubbles from the long distance, Thereby increasing the efficiency of removal.

In addition, the present invention uses the cooling unit 160 to lower the temperature of the gas and / or the fluid through heat exchange on the path through which the gas or the fluid is supplied or with the gas and the fluid, By lowering the temperature, the temperature of the entire nano bubble emission region is reduced to increase oxygen saturation, thereby increasing the removal efficiency of harmful algae.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

In addition, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims.

Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

100: nano bubble generator 110, 120: first and second bubble generator
111: Protector 112, 122: Impeller 1, 2
121: Enclosure 123: Discharge tube
130: Housing 140:
150: gas supply unit 160: cooling unit

Claims (7)

A nano bubble generating apparatus (100) for generating a nano bubble by introducing a gas and a fluid into an aeration apparatus,
A first bubble generator (not shown) for generating nano bubbles while interlocking with the rotation axis L of the driving unit M independently in a state of being coaxial with the rotation axis L of the driving unit M and radially discharging the nano bubbles directly from the main body of the nano bubble generator 100 And a second bubble generator 120 for inducing the pressure change again on the discharge path and discharging the bubble generator 110 at a relatively higher pressure than the first bubble generator 110. [
The first bubble generator 110 includes a protector 111 formed of an annular body fixed to a flange provided at one end of the housing 130 and having a long hole formed in its outer diameter. The impeller 1 (112) is fixed to an intermediate portion of the rotating shaft (L) in a state of being accommodated in the protection hole (111), generates thrust through rotation, generates a nano bubble by mixing and blasting the inflowing gas and the fluid, ), ≪ / RTI >
The second bubble generator 120 is a double annular body fixed to one end of the protector 111 constituting the first bubble generator 110. The second bubble generator 120 includes a first bubble generator 110, A housing (121) provided with an inflow path through which the gas and the fluid flow, and a housing space for accommodating the impeller (122) at the other end; And is fixed to the tip of a rotating shaft L passing through the center of one side of the housing 121 in the state of being housed in the housing 121. Thrust is generated through rotation to divide the flowing gas and the fluid, An impeller 2 122 for generating and discharging the impeller 2; One end of the housing 121 is fixed to the housing space of the impeller 2 122 and the other end of the housing 121 extends in the direction in which the driving unit M is located to provide a path for releasing the nano- And a discharge tube (123)
Wherein the nano bubble generating device comprises:
delete delete The method according to claim 1,
A partition wall 141 formed with a through hole 141a at the center fixed to a rim of the enclosure 121 of the second bubble generator 120; The dome portion is provided with a plurality of fluid inflow holes 142a and at least one gas inflow port 142b for introducing fluid and gas into the second bubble generating portion 120, And a tip end finishing unit 140 including a main body 142 fixed to the partition wall 141. The nano bubble generating apparatus according to claim 1,
The method according to claim 1,
The supply of gas to the first and second bubble generators 110 and 120 includes a gas inlet pipe 151 connected to a suction end of the intake means F for forcedly sucking outside air; A gas discharge pipe 1 152 extending in the direction of the impeller 1 112 in the first bubble generator 110 in a state connected to the exhaust end of the intake unit F; And a gas discharge pipe 2 153 extending in the direction of the impeller 2 122 in the second bubble generator 120 in a state connected to the exhaust end of the intake means F, Wherein the nano bubble generating device comprises:
The method according to claim 1,
And a cooling unit (160) for reducing the temperature of the gas through heat exchange is further provided at a portion where the gas is supplied.
The method according to claim 1,
Wherein the discharge tube (123) is configured to multistage a plurality of tubes (123 ') and (123'') having different diameters in a slidable manner, wherein an elastic body (S) is inserted between the tube ends.

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