JP2022124535A - Stirring device, methane fermentation tank, and liquid sealing type gas sealing device - Google Patents

Abstract

To provide a stirring device which has such a configuration that a structure supporting loads of a driving device and a rotation shaft does not need to be provided in a tank body, without applying the loads of the driving device and the rotation shaft to an upper wall (ceiling part) of the tank body.SOLUTION: A stirring device 1 includes a rotation shaft 5 provided on a stirring blade 4, a driving device 6, a sealing container 7 (liquid sealing type gas sealing device) for preventing leakage of gas in a tank body 2, and a trestle 8 supporting the driving device 6. The trestle 8 is installed so as to receive loads of the driving device 6 and the rotation shaft 5 on an upper surface 21a of a side wall 21 of the tank body 2 or a ground surface G.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a stirring device for stirring liquid in a tank such as a methane fermentation tank, a methane fermentation tank, and a liquid-sealed gas seal device.

Techniques of this type are disclosed in Patent Documents 1 and 2, for example. Patent Literature 1 describes an agitator for agitating the liquid in the digestion tank. This stirrer is composed of a rotating shaft to which an impeller is attached, a motor for rotating the rotating shaft, a sealed container, and the like. A mounting plate is installed so as to cover an opening formed in the upper wall surface of the digestion tank from above, and the mounting plate supports the load of the rotating shaft, the motor, the sealed container, and the like.

The agitator described in Patent Document 2 is an agitator for a digestion tank, and is composed of a vertical rotating shaft to which a screw is attached, a motor that drives the vertical rotating shaft, and an outer cylinder into which water is injected. be done. A pedestal is installed at the bottom inside the digestion tank, and the motor and the vertical rotation shaft are supported from the bottom of the digestion tank by the pedestal. The outer cylinder is installed on the upper surface of the upper wall of the tank body.

Japanese Patent No. 6719973 Japanese Utility Model Laid-Open No. 2-61500

The support structure of the stirrer (stirring device) described in Patent Documents 1 and 2 has the following problems. In the support structure described in Patent Document 1, the load of a stirrer such as a motor and a rotating shaft acts on the upper wall of the digestion tank. Therefore, for example, in the case of an existing old digestion tank, there are cases where a heavy stirrer cannot be installed due to the problem of the strength of the upper wall of the digestion tank, which may hinder replacement of the stirrer.

On the other hand, in the support structure described in Patent Document 2, the above problems do not occur. However, since the liquid in the digestion tank contains contaminants, the support structure described in Patent Document 2 has problems such as entanglement of the contaminants with the pedestal in the digestion tank. Therefore, the supporting structure of the stirrer described in Patent Document 2 cannot be said to be preferable.

An object of the present invention is to prevent the load of the driving device and the rotating shaft from being applied to the upper wall (ceiling portion) of the tank body and eliminate the need to provide a structure for supporting the load of the driving device and the rotating shaft in the tank body. An object of the present invention is to provide an agitator with a structure.

Further, in the sealed container described in Patent Document 1, the liquid level inside the container cannot be directly visually confirmed from the outside of the tank. A second object of the present invention is to provide a liquid-sealed gas seal device that allows the liquid level in the sealed container to be directly visually confirmed from the outside of the tank.

The present invention provides a rotating shaft inserted into a through hole provided in an upper wall of a tank body, the rotating shaft being provided with a stirring blade, and a driving device for rotating the rotating shaft, A driving device attached to the upper end of the shaft and a liquid-sealed gas seal device installed on the upper wall to prevent gas in the tank body from leaking out of the tank body through the through-hole. and a pedestal for supporting the driving device, the pedestal being installed so as to receive the load of the driving device and the rotating shaft on the upper surface of the side wall of the tank body or on the ground. is a stirring device comprising:

According to this configuration, the load of the driving device and the rotating shaft is received on the upper surface of the side wall of the tank body or on the ground. Therefore, the load of the driving device and the rotating shaft is not applied to the upper wall (ceiling portion) of the tank body. Further, since the load of the driving device and the rotating shaft is received by the upper surface of the side wall of the tank body or the ground, there is no need to provide a structure for supporting the load of the driving device and the rotating shaft in the tank body. According to the present invention, a new agitator can be applied to an existing tank having an old structure without having to worry about the strength of the upper wall of the tank body.

The liquid-ring type gas seal device has a double-tube cylinder-shaped seal container capable of storing a liquid, which is installed on the upper wall, and a cylindrical shaft-sealed inner cylinder inserted into the seal container from above. It is preferable that the upper end portion is fixed to the side surface of the rotating shaft.

According to this configuration, the seal container constituting the liquid ring type gas seal device is installed on the upper wall of the tank body, and the shaft seal cylinder is fixed to the rotating shaft. The driving device can be separated from the rotating shaft while maintaining the sealing function of the sealed gas seal device. In other words, without opening the tank main body, the driving device can be removed from the stirring device and maintenance work of the driving device can be performed.

Further, it is preferable that a liquid supply nozzle for supplying liquid into the sealed container is provided on the outer surface of the sealed container.

With this configuration, it is easy to supply the liquid into the sealed container. That is, the maintainability of the liquid ring type gas seal device is high.

Moreover, it is preferable that a liquid level gauge for measuring the liquid level in the sealed container is attached to the outer surface of the sealed container.

According to this configuration, it is possible to constantly grasp the liquid level in the sealed container.

Further, a sealed container mounting frame for installing the sealed container is attached to the upper surface of the upper wall, and the bottom portion of the sealed container is inserted into an installation hole formed in the sealed container mounting frame. It is preferable that the seal container is installed on the upper wall via the seal container mounting frame.

According to this configuration, the degree of freedom in setting the diameter and vertical length of the sealed container is increased, and a compact liquid-sealed gas seal device can be obtained. Alternatively, by increasing the amount of liquid stored in the sealed container, it is possible to reduce the frequency of liquid replenishment. Furthermore, since the degree of freedom in setting is high, it is also possible to create a pressure resistance specification that has a margin for the pressure inside the tank body and its pressure fluctuations.

Moreover, this invention is also a methane fermentation tank provided with the said stirring apparatus. According to the methane fermentation tank, the load of the driving device and the rotating shaft of the stirring device is not applied to the upper wall (ceiling portion) of the tank body, so even a heavy stirring device can be applied, and the degree of freedom in selecting the stirring device is increased.

The present invention also provides a liquid ring type gas seal installed on the upper wall of a tank body for preventing gas in the tank body from leaking out of the tank body through a through hole provided in the upper wall. Also a device. The liquid ring type gas seal device includes a double-tube cylinder-shaped seal container capable of storing liquid, which is installed on the upper wall, and is inserted into the outer cylinder constituting the seal container and the seal container from above. It is possible to visually check the space between the cylindrical member that constitutes the cylindrical shaft envelope. According to the liquid ring type gas seal device, the liquid level in the sealed container can be directly visually confirmed from the outside of the tank.

According to the agitator of the present invention, the load of the driving device and the rotating shaft is not applied to the upper wall (ceiling portion) of the tank body, and the structure supporting the load of the driving device and the rotating shaft is provided in the tank body. It is possible to provide an agitator with a configuration that does not require it.

Further, according to the liquid ring type gas seal device of the present invention, the liquid level in the sealed container can be directly visually confirmed from the outside of the tank.

1 is a side cross-sectional view of a methane fermentation tank equipped with a stirring device according to one embodiment of the present invention; FIG. FIG. 2 is a detailed view of part A in FIG. 1;

EMBODIMENT OF THE INVENTION Hereinafter, it demonstrates, referring drawings for the form for implementing this invention.

FIG. 1 is a side sectional view of a methane fermentation tank equipped with a stirring device 1 according to one embodiment of the present invention. 2 is a detailed view of the A portion of FIG. 1. FIG.

A methane fermentation tank is a tank for anaerobic fermentation treatment of organic waste such as sewage sludge and food waste. In the following description, an example in which the stirring device 1 according to one embodiment of the present invention is applied to a methane fermentation tank, ie, a digestion tank 100 for anaerobic fermentation of sewage sludge will be described. The stirring device of the present invention can also be applied to tanks other than the digestion tank 100 (methane fermentation tank).

As shown in FIG. 1, the digestion tank 100 (methane fermentation tank) is, for example, a concrete tank. In addition, it is good also as a digestion tank (methane fermentation tank) made from a steel plate. That is, the stirring device of the present invention can also be applied to a methane fermentation tank made of steel plate. The digestion tank 100 includes a stirring device 1, a heating device (not shown), a sludge collection pipe 3, and the like.

The agitating device 1 is for agitating sludge (organic waste, fermented liquid) introduced into the tank body 2 of the digestion tank 100 . In this embodiment, the agitator is configured to agitate sludge (fermented liquid) with three stages of agitating blades 4 that rotate in the horizontal direction. The stirring blade 4 may be an impeller (blade) as in the present embodiment, or may be a screw. Moreover, both impeller-type stirring blades and screw-type stirring blades may be provided.

A heating device (not shown) is for heating the sludge (fermented liquid) introduced into the tank body 2, and is composed of a heater (heat exchanger), a boiler, and the like. The warmer is supplied with hot water from a hot water source such as a boiler.

The sludge (organic waste) introduced into the tank main body 2 is heated by the heating device and stirred by the stirring device 1 . Digestion gas generated by anaerobic fermentation of sludge is allowed to exit from the tank body 2. - 特許庁Digestion gas (biogas) is a gas containing about 60% by volume methane and about 40% by volume carbon dioxide.

The digestion tank 100 has a temperature of about 20° C. and a retention time of about 30 to 60 days for low-temperature fermentation, a temperature of about 37° C. and a retention time of about 20 to 30 days for mesophilic fermentation, and a temperature of about 55° C. for high-temperature fermentation. It is operated with a residence time of 7 to 20 days. The temperature of the fermented liquid in the tank body 2 is kept uniform by stirring the fermented liquid with the stirring device 1 . Deposits (not shown) deposited on the bottom of the tank body 2 are drawn out of the tank body 2 at appropriate times by a withdrawal pump (not shown). The sediment may be sludge containing a lot of sand or sludge with high viscosity.

The configuration of the stirring device 1 of this embodiment is as follows.

The stirring device 1 includes a rotating shaft 5 to which a plurality of stirring blades 4 are attached, a driving device 6 that rotationally drives the rotating shaft 5, and a gas (digestion gas in this embodiment) in the tank body 2 to the outside of the tank body 2. A seal container 7 (liquid ring type gas seal device) for preventing leakage and a base 8 for supporting the driving device 6 are provided.

A through hole 9a is provided in an upper wall 9 forming a ceiling of the tank body 2, and the rotating shaft 5 is inserted into the through hole 9a. Agitation blades 4 for agitating the sludge (fermented liquid) are attached to the lower portion and the middle portion of the rotating shaft 5 .

The driving device 6 has a motor 22 (electric motor), a speed reducer 10 , and a drive shaft 11 connected to the rotating shaft 5 . Rotation of the motor 22 is decelerated by the speed reducer 10 and transmitted to the drive shaft 11 . Rotation of the motor 22 is decelerated by the reduction gear 10, so that the rotational force of the motor 22 transmitted to the drive shaft 11 is increased. A flange 11a is attached to the lower end of the drive shaft 11 (the end opposite to the reduction gear 10 side). On the other hand, a flange 5a is attached to the upper end of the rotary shaft 5. As shown in FIG. The driving shaft 11 of the driving device 6 is connected to the upper end portion of the rotating shaft 5 by connecting the flange 11 a and the flange 5 a with a bolt or the like.

As shown in FIG. 1, the pedestal 8 that supports the drive device 6 is, for example, a gate-shaped pedestal, and includes a pedestal main body 8a extending in the horizontal direction and a pedestal main body 8a provided at the end of the pedestal main body 8a and extending in the vertical direction. leg portion 8b. The gantry main body portion 8a is arranged above the tank main body 2, and the lower ends of the leg portions 8b are installed on the ground G, for example. In this embodiment, a concrete foundation 23 is provided on the ground G, and the lower ends of the legs 8b are fixed onto the concrete foundation 23. As shown in FIG. That is, the lower ends of the legs 8b are placed on the ground G through the concrete foundation 23. As shown in FIG. The gantry body portion 8a and the leg portion 8b have, for example, a truss structure, and are composed of a plurality of pillars, beams, and reinforcing members. In addition, in FIG. 1, illustration of the left side portion of the mount 8 is partially omitted. The lower end of the leg on the left side of the pedestal 8 (not shown) is installed on the ground G, for example, similarly to the leg 8b on the right side.

Here, if there is an object of sufficient strength (for example, a sturdy building) on the ground G, the lower ends of the legs 8b may be placed on that object. Further, instead of the ground G, the lower ends of the legs 8b may be installed on the upper surface 21a of the side wall 21 of the tank body 2 . This is because the side wall 21 of the tank body 2 has a sufficient supporting force against a vertical load.

As shown in FIG. 2, the housing 12 of the driving device 6 covering the driving shaft 11 is placed on the stirrer connection frame 13 and fixed with bolts or the like. The stirrer connection frame 13 is fixed to the upper surface of the frame body 8a by welding or the like. The stirrer connection frame 13 is composed of beams, reinforcing materials, and the like.

Since the rotating shaft 5 to which the plurality of stirring blades 4 are attached is suspended by the driving shaft 11 of the driving device 6, the load of the driving device 6 and the rotating shaft 5 is applied to the stirrer connection frame 13 and the frame 8. It is received on the ground G via the gantry main body 8a and the legs 8b. Therefore, the load of the driving device 6 and the rotating shaft 5 is not applied to the upper wall 9 (ceiling portion) of the tank body 2 . Further, since the load of the driving device 6 and the rotating shaft 5 is received by the ground G, it is not necessary to provide a structure for supporting the load of the driving device 6 and the rotating shaft 5 inside the tank body 2 . According to the above-described support structure of the driving device 6, the new stirring device 1 can be applied to an existing tank having an old structure without particularly worrying about the strength of the upper wall 9 of the tank body 2.

In addition, when the lower end of the leg portion 8b is installed on the upper surface 21a of the side wall 21 of the tank body 2, the load of the drive device 6 and the rotating shaft 5 will be It is received on the upper surface 21a of the side wall 21 of the tank body 2 via the legs 8a and 8b. Also in this case, the load of the driving device 6 and the rotating shaft 5 is not applied to the upper wall 9 (ceiling portion) of the tank body 2 . Further, since the load of the driving device 6 and the rotating shaft 5 is received by the upper surface 21a of the side wall 21 of the tank body 2, it is not necessary to provide a structure for supporting the load of the driving device 6 and the rotating shaft 5 inside the tank body 2. do not have.

Next, the seal container 7 (liquid ring type gas seal device) will be described. The seal container 7 is for preventing the gas in the tank body 2 from leaking out of the tank body 2 from the through hole 9a through which the rotating shaft 5 is inserted, and has a double tubular shape capable of storing liquid. It is said that As shown in FIG. 2 , the sealed container 7 has a cylindrical outer cylinder 15 and a cylindrical inner cylinder 16 smaller in diameter than the outer cylinder 15 . The lower end of the outer cylinder 15 and the lower end of the inner cylinder 16 are connected by a ring-shaped bottom plate 17 that serves as the bottom of the sealed container 7 . The liquid L stored in the sealed container 7 is water, antifreeze, or the like.

A liquid supply nozzle 18 for supplying the liquid L into the sealed container 7 is provided on the lower portion of the outer surface of the outer cylinder 15 . A pipe, a hose, and the like are connected to the liquid supply nozzle 18 . A liquid level gauge 19 for measuring the liquid level in the sealed container 7 is attached to the lower portion of the outer surface of the outer cylinder 15 . Furthermore, an overflow nozzle 27 is attached to the upper portion of the outer surface of the outer cylinder 15 . A pipe, a hose, and the like are connected to the overflow nozzle 27 . A ring-shaped flange member 20 for positioning and installing the sealed container 7 is attached to the lower end portion of the outer surface of the outer cylinder 15 . By providing the liquid supply nozzle 18 on the outer surface of the outer cylinder 15 , the liquid L can be easily supplied into the sealed container 7 . By providing a liquid level meter 19 on the outer surface of the outer cylinder 15, the liquid level in the sealed container 7 can be constantly grasped. Further, by providing the overflow nozzle 27 on the outer surface of the outer cylinder 15, the pressure inside the tank body 2 causes the upper space between the outer cylinder 15 of the seal container 7 and the cylindrical member 25 of the shaft-sealed cylinder 24 to be described later. Therefore, it is possible to prevent the liquid L in the sealed container 7 from overflowing to the outside of the container.

Here, the tank main body 2 is provided with a seal container mounting base 14 for installing the seal container 7 on the upper wall 9 so as to cover the through hole 9a provided in the upper wall 9 of the tank main body 2. mounted on the top. An installation hole 14a is formed in the mount 14 for installing the seal container. The mount 14 for installing the sealed container is made of a steel plate, reinforcing material, etc., and prevents the gas in the tank main body 2 from leaking from other than the opening of the installation hole 14a.

The bottom portion of the seal container 7 is inserted into the installation hole 14a until the flange member 20 contacts the upper surface of the mount 14 for installation of the seal container. In this state, the flange member 20 is fixed to the seal container mounting base 14 with bolts or the like. In this embodiment, the seal container 7 is thus installed on the upper wall 9 of the tank body 2 via the mount 14 for installing the seal container.

A cylindrical shaft-sealing tube 24 is inserted into the sealed container 7 from above. As shown in FIG. 2, the shaft-enveloping cylinder 24 is fixed to a cylindrical member 25 having a diameter larger than that of the inner cylinder 16 that constitutes the sealed container 7 and smaller than that of the outer cylinder 15, and an upper end of the cylindrical member 25. and a lid member 26 . A hole 26a is formed in the central portion of the cover member 26, and the rotating shaft 5 is inserted into this hole 26a. The rotating shaft 5 and the cover member 26 are fixed by welding or the like at the hole 26a portion. As a result, the upper end of the shaft envelope 24 is fixed to the side surface of the rotary shaft 5 . The space between the outer cylinder 15 that constitutes the sealed container 7 and the tubular member 25 that constitutes the shaft-sealed inner cylinder 24 can be visually observed from above the sealed container 7 .

The gas in the tank body 2 tries to leak out of the tank body 2 from the through hole 9a provided in the upper wall 9 through which the rotating shaft 5 penetrates, but is sealed by the liquid L stored in the seal container 7. Therefore, there is no leakage to the outside of the tank body 2. Since the pressure inside the tank body 2 (pressure in the gas phase) is higher than the outside pressure (atmospheric pressure), as shown in FIG. A level difference occurs. Since the sealed container 7 is installed on the upper wall 9 of the tank body 2 , it is stationary.

Since the space between the outer cylinder 15 that constitutes the sealed container 7 and the cylindrical member 25 that constitutes the inner shaft envelope 24 is visible from above the sealed container 7, the operator can see the outer cylinder 15 and the cylindrical member. 25 can be directly visually confirmed from the outside of the tank main body 2 . The liquid level between the outer cylinder 15 and the cylindrical member 25 is the liquid level inside the sealed container 7 . Since the liquid level in the sealed container 7 can be directly visually confirmed from the outside of the ink main body 2, the operator can see that the liquid L is accumulated in the sealed container 7 and the through hole 9a is sealed with the liquid L. can be easily and reliably confirmed.

According to the stirrer 1 of the present embodiment, as described above, the load of the driving device 6 and the rotating shaft 5 is not applied to the upper wall 9 (ceiling portion) of the tank body 2, so that the new stirrer 1 can be installed in an existing tank with an old structure. is easy to apply. In addition to the effects described above, the following effects can be obtained according to the stirring device 1 of the present embodiment.

When removing the driving device 6 from the stirring device 1 for maintenance, for example, the operator removes only the driving device 6 while maintaining the sealing function of the sealing container 7, in other words, without opening the tank body 2. be able to. A method of removing the driving device 6 from the stirring device 1 is, for example, as follows.

After the operation of the stirring device 1 is stopped, the upper end of the rotary shaft 5 is connected to the frame body 8a so that the load of the rotary shaft 5 can be directly supported by the frame 8. FIG. After that, the connection between the flange 11a of the drive shaft 11 and the flange 5a of the rotary shaft 5 is released, and the connection between the housing 12 of the drive device 6 and the stirrer connection stand 13 is released. Then, the free driving device 6 is lifted using a crane or the like, and the driving device 6 is moved. When the driving device 6 is lifted, the rotary shaft 5 is suspended by the gantry body 8a. At this time, the shaft-enveloping cylinder 24 fixed to the rotary shaft 5 may move slightly, but maintains substantially that position (the state in which it is inserted into the seal container 7 from above). Therefore, even after the driving device 6 is moved for maintenance, the sealing function of the sealing container 7 by the liquid L can be maintained. If the sealing function of the sealed container 7 is maintained, the digestion gas, which is a combustible gas, will not leak from the tank body 2 .

A method of re-installing the driving device 6 is, for example, as follows. The driving device 6 for which maintenance has been completed is placed on the stirrer connection frame 13 using a crane or the like. Then, while aligning the axis of the drive shaft 11 and the axis of the rotary shaft 5, the housing 12 of the drive device 6 is fixed to the stirrer connection frame 13, and the flange 11a of the drive shaft 11 and the flange 5a of the rotary shaft 5 are mounted. concatenate with At this time, the upper end portion of the rotating shaft 5 is removed from the gantry body portion 8a.

Further, in the stirring device 1 of this embodiment, the sealed container 7 is exposed above the tank body 2 . Therefore, the operator can easily perform maintenance work for the sealed container 7 .

Further, in this embodiment, the seal container mounting base 14 is provided, and the seal container 7 is sealed while the bottom portion of the seal container 7 is inserted into the mounting hole 14 a formed in the seal container mounting base 14 . It is installed on the upper wall 9 of the tank main body 2 via the container installation stand 14 .

According to this, when the tank main body 2 already has the through hole 9a, the diameter of the sealed container 7 can be set without being particularly restricted by the size of the through hole 9a. The degree of freedom in setting the diameter of the seal container 7 is high, and a compact liquid-sealed gas seal device can be obtained.

The above embodiment can be modified as follows.

The mount 14 for installing the seal container may be omitted. That is, the sealed container 7 may be directly installed on the upper wall 9 of the tank body 2 . In this case, for example, the sealed container 7 having a size matching the diameter of the through hole 9a provided in the upper wall 9 of the tank body 2 is installed.

The agitator connection mount 13 may be omitted. In this case, the housing 12 of the driving device 6 is directly attached to the upper surface of the gantry body portion 8a.

The liquid supply nozzle 18 may be omitted and the liquid L may be supplied into the sealed container 7 from the upper space between the outer cylinder 15 of the sealed container 7 and the cylindrical member 25 of the shaft-sealed cylinder 24 .

The liquid level gauge 19 may be omitted. Also, the overflow nozzle 27 may be omitted.

In addition, it is of course possible to make various modifications within the range that a person skilled in the art can assume.

1: Stirring device 2: Tank body 4: Stirring blade 5: Rotating shaft 6: Driving device 7: Seal container (liquid ring type gas seal device)
8: Base 14: Mounting base 14a for installing seal container: Mounting hole 18: Liquid supply nozzle 19: Liquid level gauge 24: Shaft sealing cylinder 100: Digestion tank (methane fermentation tank)

Claims (7)

a rotating shaft inserted into a through hole provided in the upper wall of the tank body, the rotating shaft being provided with a stirring blade;
a driving device for rotationally driving the rotating shaft, the driving device being attached to an upper end portion of the rotating shaft;
a liquid-sealed gas seal device installed on the upper wall, the liquid-sealed gas seal device for preventing gas in the tank body from leaking out of the tank body through the through-hole;
a pedestal for supporting the driving device, the pedestal being installed so as to receive the load of the driving device and the rotating shaft on the upper surface of the side wall of the tank body or on the ground;
A stirring device. The stirring device according to claim 1,
The liquid ring type gas seal device is
Having a double-tube cylinder-shaped sealed container capable of storing liquid, which is installed on the upper wall,
The upper end of a cylindrical shaft-enveloping cylinder that is inserted into the sealed container from above is fixed to the side surface of the rotating shaft,
Stirrer. The stirring device according to claim 2,
A liquid supply nozzle for supplying liquid into the sealed container is provided on the outer surface of the sealed container,
Stirrer. The stirring device according to claim 2 or 3,
A liquid level gauge for measuring the liquid level in the sealed container is attached to the outer surface of the sealed container,
Stirrer. In the stirring device according to any one of claims 2 to 4,
A base for installing the sealed container for installing the sealed container is attached to the upper surface of the upper wall,
The sealed container is installed on the top wall via the sealed container installation base in a state in which the bottom portion of the sealed container is inserted into an installation hole formed in the sealed container installation base.
Stirrer. A methane fermentation tank comprising the stirring device according to any one of claims 1 to 5. A liquid ring type gas seal device installed on the upper wall of a tank body for preventing gas in the tank body from leaking out of the tank body through a through hole provided in the upper wall,
A double-tube cylinder-shaped sealed container capable of storing liquid is installed on the upper wall,
A space between an outer cylinder that constitutes the sealed container and a cylindrical member that constitutes a cylindrical shaft-enclosed cylinder that is inserted into the sealed container from above is visible.
Liquid seal type gas seal device.

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