JP3375374B2 - Degassing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degassing device, and more particularly to a degassing device that can be easily attached to a device or component for containing or transporting fluids to degas unwanted gases. Regarding

[0002]

2. Description of the Related Art Air venting and gas venting in various plants, equipment and parts have been performed conventionally, but the method is to install valves in advance where air and gas are expected to accumulate, When moving, the security personnel stood by and opened and closed the valve to remove air and gas.

A method is also known in which a channel is formed by using a gas-permeable, liquid-impermeable film, a depressurized atmosphere is formed on the outside of the channel, and a liquid is allowed to flow through the channel to perform deaeration. For example, JP-A-51-28261, JP-A-55-121806 and JP-A-58-62637). However, these methods require large-scale equipment and cannot achieve the object of the present invention.

[0004]

In air venting and gas venting in conventional plants and equipment as described above, the location of valves in various places of plants and equipment when maintenance personnel move or stop equipment such as plants. It was very inconvenient to visit each and open and close the valve.

In addition, not only water but also hot water of high temperature, oils and fats, and chemicals such as sulfuric acid and hydrochloric acid are used in various plants and equipment, and the pressure of liquid is high, so that the operator can operate the valve in a very dangerous state. Was forced to open and close. Therefore, an object of the present invention is to provide a safe degassing device which is used in a plant or an apparatus and which constantly vents air and gas and does not allow liquid to pass without opening and closing valves.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an end portion and a cylindrical breathable liquid which can be liquid-tightly attached to a device or a component for containing or transporting a fluid to be degassed. A degassing apparatus main body having a tubular portion for mounting an impermeable membrane, a void portion is provided from the end portion of the main body through the inside of the tubular body to the side surface of the tubular portion, and the tubular ventilation is provided. Permeable liquid impermeable membrane is liquid-tightly attached to the tubular portion so as to cover the opening of the cavity existing on the side surface of the tubular portion, and the tubular permeable liquid impermeable membrane is non-permeable. Multiple layers wound only with a film treated with crystalline fluoropolymer or a porous film impermeable to air-permeable liquid
( EN) A deaeration device comprising a membrane formed by converting the fluid into a gas, and selectively permeating gas from the fluid to the outside of the device through the tubular permeable liquid impermeable membrane.

One of the features of the present invention is to remove air or gas from the fluid in the plant or equipment by using the gas permeable liquid impermeable membrane. The breathable liquid impermeable membrane used in the present invention,
It has the property of being breathable and impermeable to liquids. As such a material, a known continuous porous body obtained from a synthetic resin can be used. When using a continuous porous body of a polyolefin resin such as polyethylene or polypropylene, it is preferable to apply a water repellent treatment with a fluorine type water repellent, a silicone type water repellent or the like. As the fluororesin porous material, polytetrafluoroethylene, tetrafluoroethylene / hexafluoropropylene copolymer, polyvinyl fluoride, polyvinylidene fluoride, or other porous material can be used. Among them, polytetrafluoroethylene is stretched. The resulting porous film has chemical resistance, heat resistance,
It has excellent pressure resistance and is preferable. The porous polytetrafluoroethylene film may be a fired product or a non-fired product.

The second feature of the present invention is that the breathable liquid impermeable membrane is used in a tubular shape. By making it cylindrical, it is possible to obtain a high-strength breathable liquid-impermeable membrane with a large area even though it is related to the following third feature, and the breathable liquid-impermeable membrane is effective even in a plant or a device under pressure. It can be used as a safe degassing device with a large area and high degassing efficiency. By the way, even if the breathable liquid-impermeable membrane is used in the form of a film or sheet, the object of the present invention cannot be achieved. Further, the tubular breathable liquid impermeable membrane of the present invention is a membrane or breathable liquid impermeable membrane treated with an amorphous fluoropolymer.
It is characterized in that it is composed of a membrane formed by winding a plurality of layers of a permeable porous membrane alone . By configuring the tubular breathable liquid impermeable membrane in this way, it is possible to further improve the pressure resistance or strength of the tubular breathable liquid impermeable membrane, and various plants and devices that require pressure resistance and strength. It is suitable for degassing applications such as.

A third feature of the present invention is that the breathable liquid-impermeable membrane has a tubular shape, so that when it is attached to the tubular portion of the main body, it can be attached at both ends of the tubular membrane. In particular, it is possible to adopt a method in which the breathable liquid-impermeable membrane is caulked from above with a metal ring through an O-ring formed of natural rubber or synthetic rubber. Enables liquid-tight mounting that excels in changes. By the way, it was found that even if the breathable liquid impermeable membrane is simply crimped or pressed from above, it will change over time and easily leak due to internal or external pressure.

[0010] Generally, the pressure is often used in plant and equipment such as ^{0~1kg / cm 2, 0~10kg / cm} 2, 10~
The air-permeable liquid impermeable membrane that withstands such a pressure is 20 kg / cm ² or the like, and the film thickness of the porous polytetrafluoroethylene can be changed to deal with it. 2000 μm, porous pore size 0.01 to 5 μm,
Porous polytetrafluoroethylene having a porosity in the range of 30 to 90% can be preferably used, and the pressure resistance range in this case is in the range of 0 to 20 kg / cm ² .

In the present invention, in order to improve the pressure resistance of the breathable liquid-impermeable membrane, this membrane can be further treated with an amorphous fluoropolymer. As the amorphous fluoropolymer, 60 to 90% of perfluoro-2,2-
Dimethyl-1,3-dioxole, 10-40 mol%
Amorphous copolymers of tetrafluoroethylene of ## STR3 ## and optionally small amounts of other monomers are preferred. Examples of this amorphous copolymer include “Teflon AF1600” (a product containing about 65 mol% of dioxole units) and “Teflon AF2400” (a product containing about 85 mol% of dioxole units) manufactured by DuPont.

Such an amorphous fluoropolymer is used as a solvent, for example, perfluoro (2-butyltetrahydrofuran) [“Fluorinert FC-7” manufactured by Sumitomo 3M Ltd.].
5) ”, and the resulting solution is used as a treatment liquid for the gas permeable liquid impermeable membrane. This solution needs to be diluted to leave the membrane breathable, typically 0.0
A concentration of 1 to 5.0% by weight is preferred.

The method for treating the gas-permeable liquid-impermeable membrane with this solution is not particularly limited, and it can be treated by coating, impregnation, spraying or the like. The treated material is air dried or heat treated to evaporate the solvent. Tubular breathable liquid impermeable membrane,
In particular, as a method for producing a tubular porous polytetrafluoroethylene film, a method of extruding into a tubular shape, a method of rolling a film into a tubular shape to form a tube, or a method of combining these may be adopted. it can. From the viewpoint of strength, a product in which at least a film is combined is preferable. It is considered that the extruded tube is limited to uniaxial stretching, but the film can be biaxially stretched, so that the strength has no directionality.

[0014]

[Operation] It has a simple structure that is integrated with the metal fittings and is easy to install, and since it is possible to vent air or gas without allowing liquid to pass through at all times without artificial opening / closing of the valve, the labor of the operator is greatly reduced. Can be reduced and the safety is improved.

[0015]

EXAMPLE FIG. 1 shows a cross section of a deaerator according to an example of the present invention. The device body 1 is made of stainless steel (for example, SUS30
In 4), it includes an end portion 2 having means (tapered thread groove) 3 for attaching to a plant or an apparatus and the like, and a tubular portion 4 for mounting a tubular gas-permeable liquid impermeable membrane 5. The device body 1 is not limited to stainless steel, and various materials such as metal and ceramics can be used, but stainless steel is preferable from the viewpoint of rigidity, corrosion resistance and the like. It is needless to say that the attaching means 3 of the end portion 2 is not limited to the thread groove as long as it can be attached to the plant or the device in a liquid-tight manner.

Inside the apparatus main body 1, there is a void portion 6 extending from the end portion 2 to the side surface of the tubular portion 4 on which the tubular air-permeable liquid impermeable membrane 5 is mounted. The inner diameter (dimension) of the void 6 may be large enough to allow a fluid to be degassed, such as a plant or a device, particularly a gas, to freely flow without resistance. The structure of the void 6 does not have to be a single hole as shown in FIG. 1, and may be, for example, a bidirectional structure having an inlet and an outlet.

A tubular breathable liquid impermeable membrane 5 is mounted around the tubular portion 4 of the apparatus main body 1. In this embodiment, O is provided between the tubular breathable liquid impermeable membrane 5 and the tubular portion 4. Using ring 7,
A metal ring 8 is used on the outer side of the tubular breathable liquid impermeable membrane 5 corresponding to this, and the metal breathable ring 5 is caulked to seal the tubular breathable liquid impermeable membrane 5 to the tubular portion 4. Attach to. At this time, the O-ring 7 receiver of the tubular portion 4 is formed in a structure and height such that the O-ring 7 is not deformed more than necessary even by caulking. With such a structure, even if the tubular permeable liquid impermeable membrane 5 changes with time, the elasticity of the O-ring 7 prevents the liquid from leaking. If the O-ring 7 is made of a product such as silicone or fluorine-containing rubber, it can have excellent chemical resistance. Further, the method of mounting the tubular breathable liquid impermeable membrane 5 is not limited to caulking, but may be a tightening method such as a tightening method. It is preferable in that a stable product can be produced.

When the tubular breathable liquid impermeable membrane 5 is attached, a gap 9 is formed between the tubular breathable liquid impermeable membrane 5 and the outer peripheral surface of the tubular portion 4 of the apparatus body 1. In this way, the cylindrical air-permeable liquid impermeable membrane 5 is brought into contact with the internal fluid in the largest possible area to enhance the degassing efficiency. The tubular breathable liquid impermeable membrane 5 has, for example, an unfired stretched polytetrafluoroethylene film having a thickness of 30 μm, a porosity of 70%, and a maximum pore diameter of 0.30 μm on the surface of a metal pipe (mandrel). A plurality of rolls are rolled up to 0.5 mm and fired (heat lock), and then taken out from the metal pipe to obtain a porous polytetrafluoroethylene tube having a length of 45 mm and an inner diameter of 14 mmφ. This porous polytetrafluoroethylene tube is attached to the stainless steel tubular portion 4 of the apparatus main body 1 as described above.

The porous polytetrafluoroethylene tube thus obtained usually has a water resistance of 4.5 kg /
cm ² or more, puncture resistance 20 kg / cm ² or more. In addition,
The maximum pore size of the porous polytetrafluoroethylene membrane is 0.
When the thickness is 2 μm, the film thickness is 60 μm, the porosity is 75%, and the water pressure resistance is 4
kg / cm ² and rupture resistance of 4.8 kg / cm ² , and when the maximum film thickness is 0.2 μm, the porosity is 50%, and the film thickness is 30 μm, the water pressure resistance is 2 mm. 10 kg / cm ² ,
The puncture resistance was 50 kg / cm ² or more.

When these porous polytetrafluoroethylene tubes were caulked with O-rings and mounted as described above, no liquid leak was observed in any case. Next, when a mixture of air and water was put into the deaerator manufactured in this way and tested by pressurizing at 10 kg / cm ² , the air permeated instantly and water did not leak even after 50 hours. It was confirmed that it can be used in the same way. In addition, when hot water of 80 ° C. was added and the pressure was increased to 10 kg / cm ² , a test was conducted, but a slight amount of water vapor was transmitted, but there was no leakage of hot water.

A method of manufacturing a porous polytetrafluoroethylene tube will be described with reference to FIGS. FIG. 2 shows a state in which a porous polytetrafluoroethylene film 11 is wound to produce a tube. The porous polytetrafluoroethylene film is fused by winding it in a roll and then heating it.

FIG. 3 shows an extruded porous polytetrafluoroethylene tube 12, and a porous polytetrafluoroethylene film 13 wound on the tube 12.
A method of firing will be described. In FIG. 4, a porous polytetrafluoroethylene film 14 is wound around an extrusion-molded porous polytetrafluoroethylene tube 12, and this porous polytetrafluoroethylene film 14 is in the form of a tape. An embodiment of manufacturing a composite tube by spirally winding around 12 is shown.

FIG. 5 shows an example in which the deaerator of the present invention is attached to a piping system. In FIG. 5, 21 is piping, 22, 23, 24
Is a valve and 25 is a deaerator of the present invention. When the liquid containing gas flows in the pipe 21 and passes through the deaerator 25, only the gas permeates from the deaerator 25 through the branch pipe 26 and is deaerated. As described above, when the deaerator of the present invention is installed in a plant, a device, or the like, a liquid containing air or gas flows in the pipe to generate sound, as in the case of a conventional deaerator (valve). In addition, there is no problem that the liquid is not smoothly supplied due to the impediment of the accurate detection of the flow rate or the irregularity of the flow rate, and the liquid can be smoothly supplied.

[0024]

According to the deaeration device of the present invention, deaeration can be performed with a simple device without artificial opening / closing operation of the valve, and the operating and maintenance costs can be greatly reduced, and the safety can be improved. There is an effect that the improvement of the property is remarkable and that the fluid can be smoothly supplied.

[Brief description of drawings]

FIG. 1 is a sectional view of a deaerator of an embodiment.

FIG. 2 is a diagram explaining the production of a porous polytetrafluoroethylene tube.

FIG. 3 is a diagram for explaining the production of a porous polytetrafluoroethylene tube.

FIG. 4 is a diagram for explaining the production of a porous polytetrafluoroethylene tube.

FIG. 5 is a diagram showing a state in which a deaerator is installed in a piping system.

[Explanation of symbols]

1 ... Deaerator 2 ... end 3 ... Taper thread groove 4 ... Cylindrical part 5 ... Cylindrical breathable liquid impermeable membrane 6 ... void 7 ... O-ring 8 ... Metal ring 9 ... void 11 ... Porous polytetrafluoroethylene film 12 ... Porous polytetrafluoroethylene tube 13 ... Porous polytetrafluoroethylene film 14 ... Porous polytetrafluoroethylene tape 21 ... Piping 22, 23, 24 ... Valve 26 ... Branch pipe

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-2-283542 (JP, A) JP-A-2-273503 (JP, A) JP-A 64-88542 (JP, A) JP-A 60- 82107 (JP, A) JP-A-2-2802 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B01D 19/00-19/04

Claims (4)

(57) [Claims] 1. A degasser having an end portion that can be mounted in a liquid-tight manner on a device or a component that contains or transports a fluid to be degassed, and a tubular portion for mounting a tubular breathable liquid impermeable membrane. The apparatus main body is provided with a void portion that extends from the end of the main body through the inside of the cylinder to the side surface of the tubular portion, and the tubular breathable liquid impermeable membrane is present on the side surface of the tubular portion. Liquid-tightly attached to the tubular portion so as to cover the opening of the void, and the tubular ventilation
Liquid impermeable membrane treated with amorphous fluoropolymer
A degassing device comprising a membrane, and thus selectively permeating gas from the fluid to the outside of the device through the tubular gas-permeable liquid impermeable membrane. 2. A degasser having an end portion that can be mounted in a liquid-tight manner on a device or a component that stores or transports a fluid to be degassed, and a tubular portion for mounting a tubular breathable liquid impermeable membrane. The apparatus main body is provided with a void portion that extends from the end of the main body through the inside of the cylinder to the side surface of the tubular portion, and the tubular breathable liquid impermeable membrane is present on the side surface of the tubular portion. The tubular breathable liquid is liquid-tightly attached to the tubular portion so as to cover the opening of the void.
The body impermeable membrane consists of only a breathable liquid impermeable porous membrane wound in multiple layers.
A degassing device comprising a membrane integrally formed once , so that gas can be selectively permeated from the fluid to the outside of the device through the tubular permeable liquid impermeable membrane. 3. O-rings are provided at both outer ends of the tubular portion.
Place the tubular breathable so as to cover the outside of the tubular part
A liquid impermeable membrane is placed, and the tubular breathable liquid impermeable membrane and
And crimping the metal ring from the outside of the O-ring
From the tubular breathable liquid impermeable membrane to the tubular portion
The deaerator according to claim 1 or 2, which is liquid-tightly mounted . 4. The tubular breathable liquid impermeable membrane is a porous porous membrane.
It consists of litetrafluoroethylene, Claim 1, 2 or 3
The deaerator described.