JPH03157105A - Gas transmissible membrane for liquid degasifier and its production - Google Patents

Abstract

PURPOSE:To facilitate attachment and detachment of the member and to eliminate the leakage of a liq. in mounting by providing an end mounting member having a through hole and which is engaged with the periphery of the ends of the plural gas transmissible tubes bundled with a bundling member and directly fixed by adhesion. CONSTITUTION:A liq. to be treated is passed through the tube, and the outside is evacuated to remove the gas dissolved in the liq. The ends of the plural plastic gas transmissible tubes 51 of the gas transmissible member 50 for removing the gas in the liq. are bundled with a bundling member 52. The end mounting member 56 having a through hole 53 is engaged with the periphery of the ends of the bundled tubes 51 and fixed by adhesion. As a result, the attachment and detachment of the member are facilitated, and the liq. is not leaked in mounting.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a gas permeable member used in a liquid deaerator for removing gases such as dissolved oxygen from liquids such as tap water, and a method for manufacturing the same. Tap water red water prevention device, etc.
Cooling water or air conditioning equipment for ship engines, gas compressors,
Equipment that removes dissolved oxygen from water used in boilers, combustion equipment, etc. to prevent oxidation of piping, etc. By removing dissolved oxygen from water used in the manufacturing process of foods, beverages, etc., it prevents oxidation of the products concerned. It can be used for devices that prevent

[Background technology]

In recent years, the gas permeability of polymer membranes has been utilized to remove dissolved gases from various liquids to eliminate inconveniences caused by dissolved gases. For example, in the case of solvents used in liquid chromatography, when a highly sensitive detector is used, even a very small amount of dissolved gas becomes noise, so it is necessary to remove the dissolved gas to a nearly complete state. Further, if there is gas dissolved in chemicals, oil, etc., their deterioration will be accelerated, so the dissolved gas must be removed in this case as well.

For this reason, conventionally, simple methods include boiling the liquid or degassing it by reducing the pressure. However, these methods cannot completely remove dissolved gases, so a more complete removal method is desired.

On the other hand, JP-A-57-165007, JP-A-59-216606 and JP-A-60-25514
According to the publication, an apparatus is disclosed that performs sufficient deaeration using a capillary tube made of a polymer, that is, a gas permeable tube.

According to these devices, a gas permeable tube made of synthetic resin is spirally wound many times, the wound tube is placed in a reduced pressure atmosphere, and a liquid is caused to flow through the tube. Deaeration is performed by removing gas dissolved in the liquid through a tube.

[Problem to be solved by the invention]

However, in the device described in the above publication, an extremely long tube is wound spirally many times;
The problem is that the tubes overlap each other, reducing contact with the reduced pressure atmosphere, resulting in poor degassing efficiency, and furthermore, the lower part of the stacked tubes collapses under their own weight, increasing liquid flow resistance. There is. Furthermore, this increase in flow resistance is also caused by the tube itself being extremely long, resulting in the problem that the pump for circulating the liquid within the tube becomes larger.

By the way, according to the inventor's experiments, the so-called red water, which is the red and cloudy state of tap water in buildings, etc., is caused by red and rusted pipes in the building.In order to prevent this red water, dissolved oxygen in the tap water must be removed. It turned out to be effective.

Therefore, if dissolved oxygen in tap water is removed, it is possible to effectively prevent red water from tap water, but even if an attempt is made to remove dissolved oxygen in tap water using the device described in the above publication, the above-mentioned problem will occur. Because the distribution resistance is large as in
The problem arises that it is not practical.

On the other hand, if we try to use short and thin synthetic resin gas permeable tubes, the number of tubes will be extremely large in order to ensure a certain flow rate, and even if multiple tubes are used together, The number of attachment points for each tube is considerable.

Moreover, since the tube may become clogged or damaged during use, it must be removable and must have a structure that prevents leakage of the liquid at the end of the tube. is required.

Therefore, the end structure of the gas permeable member including a plurality of gas permeable tubes is suitable for smooth attachment and detachment, and
It is desired that no liquid leakage occurs. There is also a need for a method that can easily manufacture a structure that satisfies the above requirements.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas permeable member for a liquid degassing device that can be easily attached and detached and does not cause liquid leakage when attached, and a method for manufacturing the same.

[Means to solve the problem]

The gas permeable member according to the present invention is a gas permeable member for a liquid degassing device that allows a liquid to be treated to flow inside and removes dissolved gas in the liquid to be treated by reducing the pressure outside. Synthetic resin gas permeable tubes, a binding member that binds the ends of these gas permeable tubes, and a plurality of gas permeable tubes that are fitted to the outer periphery of the ends of the bundled gas permeable tubes with this binding member and fixed with adhesive. and an end attachment member having a through hole.

In the gas permeable member of the present invention, the binding member is preferably a heat shrink tube.

A method for manufacturing a gas permeable member according to the present invention includes: binding the ends of a plurality of synthetic resin gas permeable tubes with a binding member, and then passing the bundled ends through a through hole of an end attachment member. and insert it with a predetermined amount protruding from the end mounting member,
Furthermore, after fixing by injecting an adhesive having elasticity after curing between the inner peripheral side of the end attachment member and the gas permeable tube side,
The present invention is characterized in that the end of the gas permeable tube protruding from the end fitting member is cut off.

[Effect]

In such a configuration, the plurality of gas permeable tubes are bound by a binding member such as a heat shrink tube, and
Since it is bonded to the end attachment member, there is no possibility of liquid leakage from the end. Moreover, since it is attached to the end plate or the like of the device using this end attachment member, it is easy to attach and detach.

Furthermore, when manufacturing the gas permeable member, the gas permeable tube bundled from the end attachment member was glued with a portion protruding, and then the protruding portion was cut, so there was no adhesive inside the tube. The gas permeable member can be manufactured quickly and appropriately.

[Example] Hereinafter, an example of a liquid deaerator to which a gas permeable member according to the present invention is applied will be described based on the drawings.

FIG. 1 shows the overall structure of a liquid deaerator 1 according to this embodiment. This liquid deaerator 1 includes a bottomed cylindrical gas permeable member storage container 1O. The lower part of the storage container 10 is supported by a plurality of legs 11, and a deaeration port 12 is opened at the bottom. A depressurizing means 18 consisting of a vacuum pump or the like is connected to this deaeration port 12, so that the inside of the storage container 10 can be depressurized.

Further, a plurality of viewing windows 13 are provided in the middle of the circumferential surface of the storage container 10 as necessary.

A flange 14 is provided on the outer periphery of the upper opening of the storage container 10.
is welded thereto, and a hollow lid body 20 is provided to close this opening.

As shown enlarged in FIGS. 2 to 4, the lid body 20 is
A mirror plate 21 having a generally elliptical cross section and a generally spherical shape as a whole; a partition plate 22 whose one end is hermetically welded to the inner surface of the mirror tf21 to partition the interior of the mirror plate 21 into two chambers;
2 are arranged so as to respectively close the substantially semicircular openings of the end plate 22 partitioned by 2, and the outer peripheries are hermetically welded to the openings of the end plate 21 and the side surfaces of the partition plate 22, respectively. end plates 23, and the storage container 1 is welded to the outer periphery of the end plate 21 at substantially the same plane position as these end plates 23.
0 and a flange 24 opposed to the flange 14.

Thereby, two chambers partitioned by the partition plate 22 are formed in the lid body 20, that is, a human wave chamber 25 and a liquid discharge chamber 26. In these human wave chambers 25, there is a pipe 2 on the inlet side of the liquid to be treated.
7 is connected to the liquid output chamber 26 and a liquid output pipe 28 to be treated. Further, a differential pressure gauge 29 is connected between the human wave chamber 25 and the liquid ejecting chamber 26, so that the pressure difference between the human wave chamber 25 and the liquid ejecting chamber 26 can be detected at all times.

As can be seen from FIGS. 3 and 4, each end plate 23 is formed with the same number of through holes 31, and
On the inner surface (upper surface) of the end plate 23, each of these through holes 31
Around the periphery, welding heat dissipation ribs 32, which are circumferential grooves, are formed at predetermined intervals.

A small diameter portion 41 of a stepped cylindrical nozzle 40 is inserted into each of the through holes 31, and these small diameter portions 41
The tips of the two are each airtightly fixed to the end plate 23 by welding. At this time, since the stubs 32 are formed around the through holes 31 of the ends vi23, the welding heat of each nozzle stub 4o is sufficiently radiated, and the thermal distortion caused by welding is reduced to the end plate 23.
It is made so that it does not survive.

Therefore, by welding each nozzle 4o before the end plate 23 is welded to the end plate 21 and the partition plate 23, the end plate 23 does not bend or the like, and the end plate 23 and the end plate 21, etc. The welding of the nozzle stub 41 is not affected by the welding of the nozzle stub 41. Therefore, the end plate 23 and the end plate 21 etc. can be well welded, and sufficient airtightness can be maintained.

As can be seen from FIG. 5, each of the nozzles 40 has a male threaded portion 43 formed on the outer periphery of its large diameter portion 42, and an O'J ring 44 is attached to the inner periphery.

In FIG. 5, an end portion of a gas permeable member 50 is detachably attached to each nozzle stub 40. The gas permeable member 50 includes a plurality of gas permeable tubes 51 made of synthetic resin that are impermeable to liquid and permeable to gas, for example, 100 to 200 gas permeable tubes 51, and these gas permeable tubes 5.
1, and a through hole 53 into which the heat shrink tube 52 is inserted, and a large diameter hole 54 for injecting adhesive. Adhesive hole 5 for communicating between the
5, and a heat-shrinkable material filled between the outer end of each tube 51 and inside the large diameter hole 54 of the end attachment member 56, and on the side of each tube 51 and the gas permeable tube 51. An adhesive 57 that airtightly bonds between the tube 52 and the inner circumference of the end attachment member 56, and an adhesive 57 that is screwed into the male threaded portion 43 of the nozzle stub 40 and attaches the collar 58 of the end attachment member 56 to the nozzle stub. 40 and a cap nut 59 that is press-fixed.

At this time, both ends of each gas permeable member 50 are attached to the end plate 23 so that one end communicates with the human wave chamber 25 of the lid body 20 and the other end communicates with the liquid discharge chamber 26. Thereby, the gas permeable member 50 made of the gas permeable tube 51 is suspended in a substantially U-shape within the gas permeable member storage container IO.

The gas permeable tube 51 has, for example, an outer diameter of 0.5 to 10+ nm and an inner diameter of 0.2 to 8 mm, preferably an outer diameter of 1 to 5 mm and an inner diameter of 0.3 to 4.5 m.
+n silicone resin tube is preferred. The adhesive 57 is preferably an adhesive that has elasticity after curing, such as RTV silicone rubber.

FIGS. 6(A) to 6(D) show a method of manufacturing the end portion of the gas permeable member 50 used in the above embodiment.

In FIG. 6(A), a predetermined number of gas permeable tubes 5
A heat shrinkable tube 52 as a binding member is fitted onto the end of the gas permeable tube 5I with an adhesive 57 applied thereto, and the end of the gas permeable tube 5I is bundled into a substantially cylindrical shape by heating. . At this time, the number of gas permeable tubes 51 is set so that the outer diameter of the heat-shrinkable tube 52 in the contracted state is slightly smaller than the inner diameter 53 of the end attachment member.

The end of the gas permeable tube 51 fitted with the heat shrink tube 52 is inserted into the through hole 5 of the end fitting member 56 so that the end protrudes by a predetermined amount, as shown in FIG. 6(B).
It is inserted through 3.

Next, as shown in FIG. 6(C), adhesive 57 is injected into the large diameter hole 54 for adhesive injection of the end attachment member 56, and the heat shrinkable tube 52 and the end attachment member 56 are bonded together. Fixed. At this time, the end mounting member 56 has adhesive holes 5.
5, the adhesive 57 is sufficiently filled.

After the adhesive 57 has hardened, the gas permeable tube 51 protruding from the end attachment member 56 is cut off by the cutter 61 together with the heat shrinkable tube 52, as shown in FIG. 6(D). The edge processing is completed.

Next, the operation of this embodiment will be explained.

In FIG. 1, the pressure reducing means I8 is operated to reduce the pressure inside the gas permeable member storage container 10, and the liquid to be treated is supplied from the liquid to be treated inlet pipe 27 into the reservoir chamber 25 of the lid body 20 at a predetermined pressure. supply The liquid to be treated that has been supplied into the human storage chamber 25 passes through each nozzle 40 and flows into each gas permeable member 50, and further passes through the liquid outlet chamber 26 of the lid body 20 and comes out of the liquid to be treated. It flows out from the side pipe 28.

When flowing through the gas permeable member 50, the pressure inside the storage container 10 is reduced as described above, so that each gas permeable member 5
Dissolved gas from the liquid passing through the gas permeable tube 51 passes through the membrane of the tube 51 and is extracted into the storage container 10, and the liquid to be treated is degassed.

In this way, the liquid to be treated continues to be degassed, but if impurities such as slime (scale) contained in the liquid to be treated clog the gas permeation hole of the gas permeation tube 51 and cause clogging, Since the pressure difference between the chamber 25 and the liquid output chamber 26 becomes large, this pressure difference is detected by the differential pressure gauge 29, and if it becomes larger than a predetermined pressure difference, the operation of the liquid deaerator l is stopped, The lid 20 is removed and the gas permeable members 50 attached to each nozzle 40 of the lid 20 are replaced.

Thereafter, the liquid to be treated is degassed again in the same manner as described above.

In addition, if a break occurs in a part of the gas permeable member 50, the pressure difference between the human wave chamber 25 and the liquid discharge chamber 26 disappears.
In this case as well, the operation of the liquid deaerator 1 is stopped, and the broken gas permeable member 50 is replaced.

According to this embodiment as described above, there are the following effects.

That is, since a large number of gas permeable tubes 51 are used as the gas permeable member 50, dissolved gas can be sufficiently degassed from the liquid to be treated. At this time, the gas permeable member 5
0 hangs down from the end plate 23 of the lid 20 in a U-shape, so that the gas permeable tube 5 constituting each gas permeable member 50
1 do not overlap with each other, the pressure around them is sufficiently reduced, and the deaeration effect can be more fully achieved.

Further, since each gas permeable member 50 is U-shaped, it can be placed in a reduced pressure atmosphere for a sufficient length within the storage container 10, and sufficient degassing can be performed from this point as well.
The length dimension of 0 may be approximately half of the total length of the gas permeable member 50, and the height of the liquid degassing device 1 can also be reduced. Further, each gas permeable member 50 can be easily replaced by simply unscrewing the cap nut 59 and the nozzle stub 40, so that the gas degassing tube 51 can be quickly replaced in case of clogging or damage. can. Further, since the nozzle stub 40 is centrally arranged in one place, that is, on the end plate 23 of the lid body 30, the replacement process can be easily performed from this point as well.

Furthermore, since the gas permeable tubes 51 constituting each gas permeable member 50 are once bundled together with a heat shrink tube 52 as a binding member and inserted into the through hole 53 of the end attachment member 56, the inner diameter of the through hole 53 is - Gas permeable tube 5 in the cup
1 can be inserted, improving space efficiency. Moreover, since the binding member is the heat shrinkable tube 52, the binding work is easy.

Furthermore, since an adhesive 57 having elasticity after curing is used between the end attachment member 56 and the heat shrinkable tube 52,
Breakage at the end of the gas permeable tube 51 can be effectively prevented. In addition, the end mounting member 56 has adhesive holes 55.
is provided, the adhesive 57 can be sufficiently injected into the trapezoidal hole 54 for adhesive injection of the end attachment member 56.

Furthermore, in manufacturing the gas permeable member 50, the bundled gas permeable tubes 51 are fixed with an adhesive 57 with a portion protruding from the end attachment member 56, and then cut. Enter the tube 51 and remove the tube 5.
1 is not obstructed, and the cut end can also be formed in a plane perpendicular to the axis, making it easy to attach to the nozzle stand 40.

FIG. 7 shows an application example in which the liquid deaerator 1 of the above embodiment is applied to a tap water red water prevention device.

In FIG. 7, the liquid deaerator 1 is located in a building 2.
located on the floor. A large underground water tank 4 for storing tap water from a water main 3 is provided in the basement of this building 2. This underground water storage tank 4 is connected to one end of a rising pipe 6 that carries a water pump 5 midway, and the other end of this rising pipe 6 is connected to a small rooftop water storage tank 7. A distribution pipe 8 for supplying water to various parts of the building 2 is connected to the rooftop water storage tank 7 .

A liquid deaerator 1 according to this embodiment is connected to the rising pipe 6 midway. Therefore, the side of the rising pipe 6 that is connected to the human wave chamber 25 of the lid body 20, that is, the side of the water pump 5, is used as the liquid inlet pipe 27, and on the other hand, the side that is connected to the human wave chamber 25 of the lid body 20 is connected to the liquid output chamber 26 of the lid body 20. The side, that is, the rooftop water storage tank 7 side is the treated liquid outlet pipe 28.

The pressure reducing device 18 connected to the liquid deaerator 1 uses a water ring type vacuum pump.

In such a configuration, in order to degas the dissolved oxygen in the tap water and prevent the occurrence of red rust in the pipes 6 and 8 in the building 2 and the rooftop water storage tank 7, the pressure reducing means 18 is driven and the water supply pump is also activated. 5 is driven to supply tap water previously stored in the underground water tank 4 to the liquid deaerator 1. In this liquid deaerator 1, as explained in the above embodiment, while degassing the dissolved gas, that is, dissolved oxygen, dissolved in the tap water, the tap water without dissolved oxygen is removed from the outlet pipe of the riser pipe 6. Water is sent to the 28 side.

For this reason, tap water without dissolved oxygen is supplied to the upright pipe 6, rooftop water storage tank 7, and distribution pipe 8, preventing them from rusting (therefore, red water is supplied to the distribution pipe 8). It is not discharged from.

According to this application example as described above, red water in the tap water can be effectively prevented, and in particular, there is an effect that the rising pipe 6 leading to the rooftop water storage tank 7 will not be rusted.

Further, in this application example, each effect described in the above embodiment can be achieved as is.

It should be noted that the present invention is not limited to the above-mentioned embodiments and application examples, and the present invention includes modifications and improvements within the range that can achieve the purpose of the present invention.

For example, the liquid deaerator 1 of the present invention is not limited to a red water prevention device for tap water as in the above-mentioned application example, but can also be used for deaeration of all kinds of liquids, such as an oxygen removal device from water used for various equipment or food and beverages. It can be used as a device. but,
Considering the scale of the device, the practical effect as a device for preventing red water in tap water is extremely large.

Furthermore, the binding member of the gas permeable member 50 is not limited to the heat shrinkable tube 52, and may be made of only adhesive or a material such as a string. This has the advantage of making the bonding work easier.

Furthermore, the structure for attaching to the end plate 23 is not limited to the above-mentioned embodiment, and may be a structure such as pin fixing, band fixing, etc. In short, it is sufficient as long as it is detachable.

Further, the method for manufacturing the gas permeable member 50 is not limited to the above-mentioned embodiment, and other methods may be used, but the method as in the above-mentioned embodiment provides the above-mentioned effects.

〔Effect of the invention〕

According to the present invention as described above, it is possible to provide a gas permeable member suitable for application to a liquid deaerator and a method for manufacturing the same.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention,
Figure 1 is a sectional view of the entire device, Figure 2 is an enlarged sectional view of the lid, Figure 3 is a sectional view of the lid alone along line ■-III in Figure 4, and Figure 4 is a sectional view of the lid. 3 is a bottom view, FIG. 5 is an enlarged sectional view showing the mounting structure between the nozzle stand and the gas permeable member, FIG. 6 is an explanatory view showing the method for manufacturing the end of the gas permeable member, and FIG. 7 is the above-described method. FIG. 2 is a schematic cross-sectional view showing an application example in which the example is applied to a red water prevention device. ■...Liquid deaerator, lO...Gas permeable member storage container, 18...Pressure reduction means, 20...Lid, 40...
Nozzle stand, 50... Gas permeable member, 51... Gas permeable tube, 52... Heat shrinkable tube as a binding member,
53... Through hole, 54... Large diameter hole for adhesive injection,
55... Adhesive hole, 56... End mounting member, 5
7... Adhesive, 59... Bag nut, 61... Cutter.

Claims (3)

[Claims] (1) A gas permeable member for a liquid degassing device that allows a liquid to be treated to flow inside and removes dissolved gas in the liquid by reducing the pressure outside, the gas permeable member being made of a plurality of synthetic resins. A tube, a binding member for binding the ends of these gas permeable tubes, and an end having a through hole that is fitted to the outer periphery of the ends of the plurality of gas permeable tubes bound by the binding member and fixed by adhesive. 1. A gas permeable member for a liquid deaerator, characterized in that the gas permeable member includes a mounting member. (2) The gas permeable member for a liquid degassing device according to claim 1, wherein the binding member is made of a heat-shrinkable tube. (3) After binding the ends of multiple synthetic resin gas permeable tubes with a binding member, pass the bundled ends through the through hole of the end mounting member, and insert a predetermined amount from the end mounting member. After inserting the protruding part through the end fitting member and injecting an adhesive that has elasticity after curing between the inner peripheral side of the end fitting member and the gas permeable tube side, the part protruding from the end fitting member is fixed. A method of manufacturing a gas permeable member for a liquid deaerator, the method comprising cutting an end of a gas permeable tube.