JPH02287068A - Gas extracting device - Google Patents

Abstract

PURPOSE:To maintain the high efficiency of gas extraction by providing a pumping means for sucking a liquid thereinto an a gas-liquid separating means for separating non-condesable gas from the liquid in a liquid circulation pipeline system through which the liquid flows into a vessel again, and by causing an optimum suction eddy while keeping the depth of the liquid constant at a liquid outlet port. CONSTITUTION:The fixed amount of a liquid 9 is constantly supplied to a vessel body 1 through a liquid supply pipe 16, and the liquid 9 is sucked out by a pump 11 through a liquid outlet port 3 into a liquid suction pipe 5. In this case, a deep eddy 6 is caused at the portion of the outlet port 3, and non- condensable gas 8 is sucked into the pipe 5 due to the eddy 6 together with the liquid 9. The non-condensable gas 8 then flows into the pump 11 in the state of small bubbles 8b, and the mixed fluid 13 of the gas and the liquid passes through the pump 11 to enter a gas-liquid separator 12 wherein the non-condensable gas is separated from the fluid 13, compressed up to the level of an ambient air pressure and exhausted as extracted gas 8a. On the other hand, the liquid separated from the non-condensable gas is supplied to the vessel body 1 again in the state of the liquid 9 through the liquid supply pipe 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air bleed system, and particularly to a public air bleed system for improving the performance and reliability of non-condensable gas bleed in absorption chillers and other industrial machines. It is related to the device.

[Prior Art] As described in, for example, Japanese Utility Model Application Publication No. 61-71874, a conventional device has a solution outflow portion of an absorber liquid level holding plate provided below a group of heat transfer tubes of an absorber. A technique is disclosed in which a guide plate and a cylindrical body are provided so that the solution flows out in a vortex, and noncondensable gas is continuously extracted from the solution together with the solution.

Furthermore, for example, the device described in JP-A-54-14755.0 is based on the above-mentioned self-bleeding device, and by fixing the liquid level holding plate to the tube plate and shell, the liquid flow is improved. The height of the liquid level at the outlet is kept constant to ensure stable extraction of non-condensable gas.

[Problems to be Solved by the Invention] The device described in the above-mentioned Japanese Utility Model Application Publication No. 61-71874 extracts non-condensable gas along with the liquid from the liquid outlet from which the liquid (solution) was flowing out in the absorber. However, in order for this bleeder to demonstrate its bleed ability, the amount of liquid accumulated in the bleeder itself must be at an appropriate level, and the amount of liquid flowing into the bleeder must be adjusted to an appropriate level. It is necessary that the flow of liquid flowing out is equal to the amount of liquid flowing out, and that the amount of liquid is within a certain range. However, it has been difficult to stably maintain all of these conditions with conventional equipment.

Therefore, a liquid level maintaining device described in Japanese Patent Application Laid-open No. 147550/1983 was developed to maintain these conditions as stably as possible.

In order to maintain a constant liquid level from which non-condensable gas is sucked out, this device first fills a shelf with liquid and then allows the excess liquid to overflow from the edge to maintain a constant liquid level. By sucking out the liquid from the shelf, extraction is performed with non-condensable gas mixed into the liquid. It is true that air can be extracted with this method, but in order to keep the liquid level constant, excess liquid must be drained, which is wasteful.

Furthermore, in order to continue the entire cycle, the overflowing liquid must be combined with the liquid mixed with non-condensable gas and circulated again. A gap was created in the middle of the pipe where the liquid was flowing, and the liquid that overflowed directly through the gap was allowed to join the liquid flowing inside the pipe.

With this mechanism, the liquids can certainly merge, but the non-condensable gas is removed from the flowing liquid mixed with the non-condensable gas.
The overflowing liquid flows back through the gap created in the middle of the pipe, and the non-condensable gas eventually returns to its source, reducing the extraction capacity.

In addition, even though the diameter of the part that sucks out liquid 4 has a great effect on the extraction performance, it may not be the appropriate diameter and the air cannot be extracted, or even though the non-condensable gas has been sucked out, the flow path in the middle becomes wide and the flow rate is low. There was a problem in that the non-condensable gas was separated from the liquid and flowed back, or accumulated in the middle of the flow path, reducing the extraction capacity.

The present invention has been made in order to solve the problems in the prior art described above, and when extracting air using the suction force of a liquid vortex, the depth of the liquid at the liquid outlet is kept constant and the optimal suction is achieved. The first objective of this invention is to provide an air extraction device that can generate a vortex and maintain high extraction efficiency.

A second object of the present invention is to provide an air extraction device in which the sucked out non-condensable gas does not flow back and return to its original state.

[Means for Solving the Problems] In order to achieve the first object of item 2, the configuration of the first invention related to the bleeder of the present invention is to provide a container containing the non-condensable gas and liquid to be bleed. A bleeder is equipped with a liquid outlet at the top of the container, and sucks out noncondensable gas along with the liquid by causing the liquid to flow out from the outlet in a vortex. A liquid circulation piping system for introducing liquid into the liquid circulation piping system is provided, and the liquid circulation piping system includes pump means for sucking the liquid and gas-liquid separation means for separating non-condensable gas.

More specifically, the hole diameter of the liquid outlet is set to a Froude number that should generate a deep vortex at the outlet when the liquid flows out.

In addition, the pipes of the liquid circulation piping system are set to have a flow rate such that the non-condensable gas sucked out together with the liquid from the liquid outflow 1 into the pipes flows while maintaining fine bubbles.

Furthermore, in order to achieve the second object of F.2, the configuration of the second invention related to the gas extraction device of the present invention is such that a liquid outlet is provided in the lower part of the container containing the non-condensable gas and liquid to be extracted. Prepare,
In an extraction device that sucks out noncondensable gas along with the liquid by causing the liquid to flow out of the outlet in a vortex, the liquid circulation piping system is connected to the liquid outflow (=1) of the container and causes the liquid to flow into the container again. and a pump means for sucking liquid into the liquid circulation piping system, and a gas-liquid separation means for separating non-condensable gas, and a liquid storage container connected to the container through a communication port of the gas phase part, and A backflow prevention means is provided for communicating the liquid reservoir container with the pipe line of the liquid outflow section 11F in the liquid circulation piping system.

The most basic configuration of the backflow prevention means includes a U-shaped communication pipe.

In addition, the technical means for achieving the above object 1] will be described in more detail below in accordance with the idea of developing the present invention.

In other words, by applying the principle that when sucking out liquid, a vortex that forms at the liquid outlet of a container draws in the surrounding gas, it is possible to bleed air by sucking out non-condensable gas from the outlet along with the liquid.

At that time, a vortex that efficiently sucks out the surrounding gas cannot be generated unless the liquid flow rate and the liquid depth at the outlet are under certain conditions, especially when the liquid depth at the liquid outlet is the deepest. It is important to keep this depth at a suitable value as this will affect the generation of vortices.

Therefore, a separate liquid reservoir is installed below the bottom where the liquid outlet is located, and when the amount of liquid fluctuates, this variation can be adjusted by putting liquid in and out of the deep reservoir container. The liquid depth at The liquid can be taken out and put into the liquid reservoir by connecting the flow path through which the liquid drawn out from the liquid outlet and mixed with non-condensable gas flows.

When the amount of liquid decreases and the flow rate from the liquid outflow 1 becomes insufficient, the liquid is naturally replenished from the liquid reservoir into the channel.

When the liquid volume increases and the flow rate from liquid outflow (-1) increases, the excess liquid naturally flows from the flow path to the liquid reservoir and is temporarily stored.When there is no fluctuation in the liquid volume, There is no flow of liquid into or out of the liquid storage container, and the amount of liquid in the liquid storage container does not change.However, if the flow path through which liquid containing non-condensable gas flows and the liquid storage container are simply connected with a pipe, etc., the liquid that has been sucked out will The condensed gas flows back toward the first reservoir through the pipes of this joint, and finally returns from the reservoir to the place where it was originally extracted.Therefore, once a part of this joint is It was decided to provide a T-shaped and J-shaped flow path so that the flow would flow from 1 to 1 and then turn back to -1-.

In this case, even if the non-condensable gas becomes bubbles and tries to go to the liquid storage container, there is a downward flow path on the way, so the non-condensable gas cannot flow downward due to the difference in specific gravity and will not flow into the liquid storage container. The inflow of non-condensable gas can be prevented, and all the non-condensable gas sucked out from the liquid outlet can be extracted.

[Operation] The operation of the technical means described in -h will be explained with reference to the most general second invention.

A vortex is generated at the liquid outlet of the container, and the surrounding gas is pulled in together with the liquid by the suction force of this vortex. This allows any low pressure non-condensable gas to be extracted.

In order to generate this vortex, the depth of the liquid flowing out must be maintained at a certain value, but by providing a separate liquid storage container, if the liquid increases, the excess liquid can be placed in the liquid storage container. It works to release the liquid so that the depth of the liquid at the liquid outlet does not increase, and when the liquid becomes insufficient, the liquid in the liquid reservoir is released to prevent the depth of the liquid at the liquid outlet from decreasing. Operate.

The liquid flows into and out of this liquid storage container using a U-shaped flow path that flows downward at -degrees and then turns upwards, so that the non-condensable gas sucked in at -degrees also has a light specific gravity. This prevents the liquid from flowing back toward the reservoir, thus preventing the efficiency of extraction from decreasing.

Furthermore, in order to generate a deep vortex that efficiently sucks in surrounding air at the liquid outlet, such as in a multilayer structure, the diameter of the liquid outlet must match the amount of liquid being sucked in.

The diameter of the liquid outlet should be set so that the Froude number is 0 for the amount of liquid sucked.
．． Since the value is set to 3 to 0.7, it is possible to generate a vortex that can most efficiently suck in the non-condensable gas.

Furthermore, even if the non-condensable gas is sucked out together with the liquid, there is a risk that the non-condensable gas will collect in the flow path and flow back. To prevent this, the cross-sectional area of the flow path is set so that the flow velocity is 0.3 m/sec or more, so the non-condensable gas remains as fine bubbles without condensing, and the downward flow Even if there is a passage, the non-condensable gas does not flow backwards and flows together with the fluid, so the extraction capacity is not reduced.

[Embodiments] Each embodiment of the present invention will be described below with reference to FIGS. 1 to 5. The embodiments shown in FIGS. 1 to 3 correspond to the embodiment of the second invention.

FIG. 1 is a longitudinal sectional view of an air extraction device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a can body containing a non-condensable gas 8 and a liquid 9 to be extracted. The can body 1 is a part corresponding to an absorber in, for example, an absorption refrigerator. Reference numeral 2 denotes a liquid tank related to a liquid reservoir connected to the can body 1 through a communication hole 7 in the gas phase section. 3 is a liquid outlet provided at the lower part of the can body 1; 4 is a U-shaped communication pipe relating to a backflow prevention means that communicates the liquid tank 2 with a pipe line at the lower part of the liquid outlet;
Reference numeral 5 denotes a liquid suction pipe constituting a liquid circulation piping system, and this liquid suction pipe 5 is connected to the lower part of the liquid outlet 3 of the can body 1. Reference numeral 11 denotes a pump connected to the liquid suction pipe 5 provided with a liquid ring pipe system; 1 and 2 denote gas-liquid separators related to gas-liquid separation means for separating non-condensable gas; Vessel 1
2 also serves as a bleed gas discharge device. 16 is a liquid supply pipe that constitutes a liquid circulation piping system.

A more detailed configuration and operation of the air extraction device shown in FIG. 1 will be explained below.

A constant amount of liquid 19 is always supplied to the can body 1 from a liquid supply pipe 16. At the bottom of the can body 1, there is provided a liquid outflow [13] with a diameter such that the Froude number is O6; 3 to 0.7 with respect to the flow rate of the supplied liquid i. is this liquid outflow [13 to liquid suction pipe 5, pump 11
is sucked out by being driven. Liquid outlet 3
Since the diameter of the hole and the flow rate match, a deep vortex 6 is generated at the liquid outlet 3. Therefore, the non-condensable gas 8 is sucked into the liquid suction pipe 5 along with the liquid 9 by this vortex 6. The liquid suction pipe 5 is installed with a cross section that allows the mixed fluid Jco 3 of the liquid 9 and the non-condensable gas 8 to flow at 0.3 FT1/S or more, so the pump 11 is in a state of small bubbles as shown in 8b.
flows into. Mixed fluid 13 passes through pump 11 and enters gas-liquid separator 12 . Here, the mixed fluid 13 separates non-condensable gas, compresses it to atmospheric pressure, and exhausts it as bleed gas 8a.

On the other hand, the liquid from which the non-condensable gas has been separated is again supplied to the can body 1 in the form of liquid 9 through the liquid supply pipe 1G.

Although it is possible to carry out a gas extraction operation in this way, the liquid amount generally fluctuates greatly and tends to disrupt this extraction operation. Therefore, the liquid tank 2 is installed below the can body 1, and the bottom of the liquid tank 2 and the liquid suction pipe 5 are connected by a U-shaped communication pipe 4.

Normally, when there is no fluctuation in the liquid volume, there is no liquid going in or out of the liquid tank 2, that is, the liquid in the U-shaped communication pipe 4 is
It does not flow in either direction a or 17b and remains stationary. Therefore, even if the mixed fluid 13 containing the non-condensable gas sucked from the liquid outflow 13 flows inside the liquid suction pipe 5,
Because of the downward flow path 4a of the U-shaped communication pipe 4, it is completely impossible for the non-condensable gas bubbles 8b to flow back into the liquid tank 2 due to the specific gravity. Therefore, liquid outlet 3
All the non-condensable gas sucked out from the gas-liquid separator 12 is discharged to the atmosphere via the pump 11.

At this time, there is no flow of liquid into or out of the liquid tank 2, so there is no change in the amount of liquid 1O in the liquid tank 2.

When the total flow rate increases, excess liquid from the liquid suction pipe 5 flows through the communication pipe 4 in the direction of arrow 17.1 and flows into the liquid tank 2, during which time it is sucked into the liquid outflow 1'l:3. Since there is a large amount of liquid, the optimum vortex 6 cannot be created, which reduces the extraction capacity. However, all the excess liquid enters the liquid tank 2, and as mentioned above, the liquid does not flow in and out of the two-liquid tank 2, resulting in an optimal vortex 6. It becomes a bleed operation.

On the other hand, when the total liquid volume decreases, the liquid 10 flows from the liquid tank 2 to the liquid suction pipe 5 to compensate for the insufficient liquid volume. Then, as described above again, the liquid no longer flows in and out of the liquid tank 2, resulting in optimal air extraction operation.

Note that when the total amount of liquid increases, some non-condensable gas bubbles may flow into the liquid tank 2 when the liquid flows from the liquid suction pipe 5 into the liquid tank 2. However, this is temporary and normally the amount of liquid does not change significantly, so the liquid tank 2
There is not much inflow or outflow of liquid. Moreover, when the liquid flows into the liquid tank 2, it must flow downward once at the part 4a, so the non-condensable gas, which has a lower specific gravity than the liquid, floats up and cannot flow downward, and as a result, the non-condensable gas Does not flow into liquid tank 2.

According to this embodiment, the following effects can be obtained.

1) Since air can be extracted using the suction force of the vortex, it is possible to extract air up to the saturation pressure of the liquid, and if a liquid with a low saturation pressure is selected, air can be extracted at any lower pressure.

2) Since the diameter of the liquid outlet 3 of the can body 1 is set so that the Froude number is 0.3 to 0.7 with respect to the liquid outlet, a vortex is created to efficiently suck in the non-condensable gas. can be generated and the extraction efficiency can be improved.

3) Since the cross section of the flow path is set so that the flow velocity of the liquid containing non-condensable gas flowing through the suction pipe 5 is 0.3 m/sea or more, it is possible to prevent the back flow of non-condensable gas and increase the extraction efficiency. Can be maintained.

4) Since the U-shaped communication pipe 4 is provided between the liquid tank 2 and the suction pipe 5, the suctioned non-condensable gas does not flow back and return to its original state, so the extraction efficiency does not decrease.

In addition, since the liquid tank 2 is provided, the depth of the liquid at the liquid outflow 1" 3 can be kept constant even if the liquid area changes, so the optimal suction vortex can always be generated and the extraction efficiency can be maintained at a high level. can.

Next, FIG. 2 is a longitudinal sectional view of an air extraction device according to another embodiment of the present invention. In the figure, the same reference numerals as in FIG. 1 are the same parts as in the previous embodiment, so the explanation thereof will be omitted.

In the embodiment shown in FIG. 2, the U-shaped communication pipe 4 shown in FIG. 1 is replaced with a backflow prevention mechanism 14 having a double pipe structure. In other words, the pipe line 2a connected to the bottom of the liquid tank 2 and the flow path connected to the liquid suction pipe 5], 4a have a double pipe configuration, and the pipe line 2a is inserted into the flow path 14a. The configuration is as follows.

According to the embodiment shown in FIG. 2, the same effects as the previous embodiment shown in FIG. 1 are expected.

It goes without saying that this backflow prevention mechanism may be constructed in a similar shape by making a case of a curved plate or the like instead of a pipe.

Next, FIG. 3 is a longitudinal sectional view of an air extraction device according to still another embodiment of the present invention. In the figure, the parts with the same reference numerals as No. 114 are the same parts as in the previous embodiment, so the explanation thereof will be omitted.

In the embodiment shown in FIG. 3, the liquid tank 2A is placed at the bottom of the can body 1.
The T-shaped and J-shaped communication pipe 4 shown in FIG. 1 is formed as a three-fold backflow prevention mechanism 15, and the entire structure is integrated and miniaturized.

In FIG. 3, 7A is a communication pipe that communicates the gas phase between the can body 1 and the liquid tank 2A. In addition, the triple pipe section connects the pipe body flow path 5a communicating with the liquid suction pipe 5 to the liquid suction pipe 5.
Tube flow paths 1.5b are provided around the liquid suction pipe 5 and connected to the liquid tank 2A so as to cover the tube flow path 15a, and are arranged concentrically with respect to the central axis of the liquid suction pipe 5. .

The embodiment shown in FIG. 3 is expected to have the same effects as the embodiment shown in FIG. 1, and also has an advantage unique to this embodiment in that the apparatus can be made compact.

Each of the embodiments shown in FIGS. 1 to 3 above is an embodiment of the second invention of the air bleed device of the present invention. This will be explained with reference to FIG.

FIG. 4 is a longitudinal sectional view of an air extraction device for a suction refrigerator according to an application example of the present invention.

In FIG. 4, 21 is an absorber which is a can containing the non-condensable gas 8 to be extracted and the solution 18, and 23 is the absorber 2.
The solution outlet [1, 25 provided at the lower part of the absorber 1 is a solution suction vibrator that constitutes a solution circulation piping system, and this solution suction vibe 25 is connected to the solution outlet 023'F section of the absorber 21. 26 is a solution supply pipe constituting the solution circulation piping system, 27 is a non-condensable gas extraction pipe, 28 is a concentrated solution supply pipe, 29a, 29b are absorption heat exchanger tubes installed in the absorber 21, and 30 is a It is a refrigerant vapor duct.

31 is a solution suction pipe 25 provided in the solution circulation piping system.
A pump 32 connected to is a gas-liquid separator related to gas-liquid separation means for separating non-condensable gas.

A more detailed configuration and operation of the extraction device of the absorption refrigerator shown in FIG. 4 will be explained.

Refrigerant vapor enters the absorber 2J through a refrigerant vapor duct 30 connected from an evaporator (not shown). The concentrated solution (absorbing liquid) supplied from the regenerator (not shown) through the concentrated solution supply pipe 28 acts to absorb the refrigerant vapor dispersed in the absorption heat transfer tube 29a.

After the absorption action is completed, the absorber 21. The solution accumulated at the bottom is pumped into the solution suction vibe 25 from the solution outflow L123. At this time, the mixed fluid 13 flows into the pump 31 through the solution suction vibe 25 while creating a deep vortex 6 and drawing in the surrounding non-condensable gas. The solution discharged from the pump 31 enters the gas-liquid separator 32. The mixed fluid 13 separates the non-condensable gas 7 and extracts the bleed gas 8 through the non-condensable gas discharge pipe 27. ．． Exhaust as 1. Alternatively, the non-condensable gas can be sent to the regenerator (not shown) side to enable extraction.

On the other hand, the solution from which the non-condensable gas has been separated is supplied to the solution supply pipe 2.
6 is supplied to the absorber 21 again.

The absorption action of the refrigerant vapor dispersed in the absorption heat transfer tube 29b is performed.

In this device, the solution is sucked in from the absorber 21 and the non-condensable gas is drawn in at the solution outflow [:] 23. By setting the hole diameter so that 1. A deep vortex 6 is created when the solution is sucked in, and the non-condensable gas 8 is drawn into this vortex 6 so that it can be extracted efficiently.

The solution containing non-condensable gas due to the vortex, that is, the mixed fluid 13, flows through the solution suction pipe 2 at a flow rate of 0.2 m/see.
By setting the flow path cross section so that it flows through Bombco 31.5, the non-condensable gas does not separate and flow backward. The gas can be sent to the gas-liquid separator 32 to ensure that air is extracted.

Next, as an application example of the second invention, an example of an air extraction device for an absorption refrigerator will be described with reference to FIG. 5.

FIG. 5 is a sectional view of an air extraction device for an absorption refrigerator according to another application example of the present invention. In the figure, parts with the same reference numerals as those in FIG. 4 are equivalent parts, so their explanation will be omitted. The apparatus shown in FIG. 5 corresponds to the embodiment shown in FIG. 1 applied to an absorption refrigerator.

In FIG. 5, 22 indicates communication between the absorber 21 and the gas phase part [
A solution tank 24 related to a liquid storage container connected via a .

Further, the gas-liquid separator 32A has a double cylindrical structure which has better separation performance than the gas-liquid separator 32 shown in FIG. 4.

The solution tank 22 is stored in the solution tank 22 when the concentration of the solution (absorbing liquid) changes due to load fluctuations of the absorption chiller or changes in the temperature of the cooling water, and when the volume of the entire solution changes, for example, when the volume of the solution decreases, The solution 20 previously stored in the solution tank 22 is sent to the solution suction pipe 25 through the communication pipe 24 to supplement the circulation amount of the solution, and the solution outflow [1
The liquid level height at 23 is kept constant to ensure efficient air extraction at all times. On the other hand, when the concentration of the solution becomes thinner and the total volume of the solution increases, the solution suction vibrator 25
The solution sucked into the solution tank 2 passes through the communication pipe 24.
Enter 2. As a result, the liquid level height at the solution outflow 1-] 23 can be made constant, and the Froude number can be maintained at an optimum level, so that efficient air extraction is possible.

Since the communication pipe 24 has a U-shape, in the part 24a, the non-condensable gas flows from the solution suction vibe 25 to the solution tank 22.
Since there is no backflow to the lower pressure side, the air can be extracted from the low pressure side more efficiently.

In addition to the above-mentioned embodiments, although not shown or described here, for example, by providing a flow rate adjustment valve in the solution supply pipe of the solution circulation piping system of an absorption refrigerator, the solution outlet of the absorber can be adjusted. It is also possible to secure the flow rate in the solution tank, and it is particularly effective to adjust the flow using a control valve in a device that does not have a solution tank.

[Effects of the Invention] As described in detail below, according to the present invention, when extracting air using the suction force of the liquid vortex, the depth of the liquid at the liquid outlet is kept constant and the optimal level is achieved. It is possible to provide an air extraction device that can generate a suction vortex and maintain high extraction efficiency.

Further, it is possible to provide an air extraction device in which the non-condensable gas sucked out does not flow back and return to its original state.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an air bleed device according to one embodiment of the present invention, FIG. 2 is a longitudinal sectional view of an air bleed device according to another embodiment of the present invention, and FIG. FIG. 4 is a vertical cross-sectional view of an air bleed device according to another embodiment of the present invention, FIG. 4 is a vertical cross-sectional view of an air bleed device of an absorption chiller according to an example of application of the present invention, and FIG. It is a sectional view of the extraction device of the absorption refrigerator concerning this. 1...Can body, 2,2A...Liquid tank, 3...Liquid outlet, 4...Communication pipe, 5...Liquid suction pipe, 6...
・Vortex, 7...Communication port, 8...Noncondensable gas, 11...
Pump, 12... Gas-liquid separator, 14. 15... Backflow prevention mechanism, 16... Liquid supply pipe, 21... Absorber, 2
2...Solution tank, 23...Solution outlet, 24...
Communication pipe, 25...solution suction pipe, 26...solution supply pipe, 31...pump, 32.32A...gas-liquid separator.

Claims (1)

[Claims] 1. A liquid outlet is provided at the bottom of the container containing the non-condensable gas and liquid to be extracted, and the liquid flows out from the outlet while creating a vortex, so that the non-condensable gas and the liquid can be extracted. The extraction device for sucking out the liquid is provided with a liquid circulation piping system that communicates with the liquid outlet of the container and causes the liquid to flow into the container again, a pump means that sucks the liquid into the liquid circulation piping system, and an air bleed system that separates the non-condensable gas. An air extraction device characterized by comprising a liquid separation means. 2. In an air bleed device that includes a liquid outlet at the bottom of a container containing the non-condensable gas and liquid to be extracted, and sucks out the non-condensable gas along with the liquid so that the liquid flows out from the outlet while creating a vortex, A liquid circulation piping system is provided that communicates with the liquid outlet of the container and causes the liquid to flow into the container again, and includes a pump means for sucking the liquid into the liquid circulation piping system, and a gas-liquid separation means for separating noncondensable gas. and a liquid reservoir connected to the container through a communication port in the gas phase section, and a backflow prevention means for communicating the liquid reservoir with a pipe line below the liquid outlet in the liquid circulation piping system. An air extraction device characterized by: 3. The air extraction device according to claim 1, wherein the hole diameter of the liquid outlet is set to a Froude number that should generate a deep vortex at the outlet when the liquid flows out. 4. A claim characterized in that the pipe line of the liquid circulation piping system is set to a flow passage cross section such that the non-condensable gas sucked out together with the liquid from the liquid outlet into the pipe line flows at a flow rate while maintaining fine bubbles. Item 1. The air extraction device according to item 1. 5. The air bleed device according to claim 2, further comprising a U-shaped communication pipe as a backflow prevention means for communicating the liquid reservoir and the pipe below the liquid outlet. 6. As a backflow prevention means for communicating the liquid reservoir container and the pipe line at the bottom of the liquid outlet, a multi-channel configuration is used in which the pipe line connected to the liquid reservoir container and the channel connected to the pipe line at the bottom of the liquid outlet are connected. The air extraction device according to claim 2, characterized in that: 7. In an absorption refrigerator consisting of an evaporator, condenser, absorber, regenerator, and a piping system that functionally connects these, a solution outlet is provided at the bottom of the absorber, and the solution flows from this outlet into a vortex. In an extraction device for an absorption refrigerator that sucks out non-condensable gas along with a solution so that the gas is generated and flows out, a solution circulation piping system is provided which communicates with the solution outlet of the absorber and causes the solution to flow into the absorber again. 1. An air extraction device for an absorption refrigerator, characterized by comprising a pump means for sucking a solution into a solution circulation piping system, and a gas-liquid separation means for separating non-condensable gas. 8. In an absorption refrigerator consisting of an evaporator, condenser, absorber, regenerator, and a piping system that functionally connects these, a solution outlet is provided at the bottom of the absorber, and the solution flows from this outlet into a vortex. In an extraction device for an absorption refrigerator that sucks out noncondensable gas along with a solution so that it is generated and flows out, a solution circulation piping system is provided that communicates with the solution outlet of the absorber and causes the solution to flow into the absorber again. It is equipped with a pump means for sucking the solution into the solution circulation piping system, and a gas-liquid separation means for separating non-condensable gas, and a liquid reservoir connected to the absorber through a communication port in the gas phase part, and A bleeder for an absorption refrigerator, comprising a U-shaped pipe that communicates between a reservoir and a pipe below a solution outlet in the solution circulation piping system.