JP3398824B2 - 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 an object thereof is to connect a vacuum chamber and a liquid delivery pipe via a degassing element so that the degassing element is free to rotate in a connection port of the vacuum chamber. An object of the present invention is to provide a deaerator having excellent sealing properties and tube durability, which does not cause positional displacement.

[0002]

BACKGROUND OF THE INVENTION With the creation of highly sensitive detectors in various analytical instruments such as liquid chromatography,
High-purity analytical reagents are also required. For example, in the case of a solvent used for liquid chromatography, as the sensitivity of the detector increases, even minute air bubbles (dissolved gas) will appear as noise, so the dissolved gas in the solvent can be almost completely removed. If not removed, highly accurate analysis results cannot be obtained. In addition, when dissolved gas is contained in liquid such as chemicals, printing ink, oil, etc., the liquid itself deteriorates and deteriorates in many cases, which is not desirable, and the degassing state of dissolved gas in liquid is analyzed. It is a factor that determines the quality of the result.

[0003]

2. Description of the Related Art As a degassing device for degassing a dissolved gas in a liquid, for example, a tube bundle b in which a large number of long gas-permeable synthetic resin tubes a are bundled, as shown in FIG. An example is a degassing element D composed of a tubular fitting piece c made of polytetrafluoroethylene that is joined to the end of the tube bundle b via a heat-fusible fluororesin powder. Such a degassing element D is used by being disposed inside a vacuum chamber F connected to a vacuum pump E as shown in FIG. That is, the liquid to be degassed was made to flow through the tube a by the liquid feed pump G, and the dissolved gas in the liquid was removed via the tube wall.

Here, when disposing the deaerating element D inside the vacuum chamber F, for example, a cylindrical adapter H as shown in FIG. 6 has been used. This adapter H
Is formed with a pipe connector portion i to which a pipe for feeding the liquid to be degassed is connected to the outer peripheral surface, and a fitting portion j to which the fitting piece c of the degassing element is fitted to the inner wall of the tip end portion. In addition, a flange portion k and a screw portion y for fitting a nut are formed in the middle thereof, and the degassing element D is fitted in the system of the vacuum chamber F as shown in the drawing to fix the screw portion y. It was used by fixing with nut Z.

However, the adapter H shown in FIG.
When the tube a is connected to the vacuum chamber F by using, the length of the tube a disposed in the vacuum chamber F is increased because the holdup amount of the processing liquid is increased or the adapter H is too large. There is a drawback that it becomes shorter and the effective film area cannot be made large. Therefore, in light of this situation, a fluororesin adapter m as shown in FIG. 7 has been created. This fluororesin adapter m is formed of a tubular body portion p and a flange portion q formed at the tip thereof as shown in the figure, and a pipe connector portion r and a screw portion s are provided on the outer peripheral surface of the body portion p. Was formed.

FIG. 8 is a partially enlarged view of a deaerator O using the fluororesin adapter m, and FIG. 9 is a sectional view of the deaerator O. As shown in the figure, this deaerator O is a tube bundle 1 in which fluororesin tubes are joined and integrated.
A tubular fluororesin adapter m is fitted to the end of the tube bundle 1 via a heat-fusible fluororesin powder to form a degassing element N. The degassing element N is attached to the vacuum chamber F with a nut. It was constructed by fixing via z.

[0007]

However, in the deaerator O shown in FIGS. 8 to 9, the adapter m is fixed to the vacuum chamber F via the nut z and then the pipe connector portion of the adapter m is fixed. When connecting the liquid transfer pipe to r, the adapter m idles inside the connection port F-1 of the vacuum chamber F, which makes handling very difficult and obtains a good sealing property. There was a problem of not being. That is, when connecting the liquid delivery pipe to the pipe connector portion r, the flange portion q idles, and a positional shift easily occurs in the vacuum chamber F, so that the sealing property in the degassing device deteriorates, Further, there is a problem that the tube is likely to be deformed or damaged.

Therefore, the present invention is an apparatus for degassing a dissolved gas in a solution, in particular, it can reduce the hold-up amount of the processing liquid, can take a large effective membrane area, and can connect a liquid feed pipe. It is an object of the present invention to provide a deaerator having good sealability and excellent tube durability without causing idling of the deaerator element adapter or displacement of the adapter.

[0009]

In order to achieve the above object, in the invention of claim 1, in a deaerator in which a deaerating element is inserted through a connection port of a vacuum chamber, the deaerating element has a plurality of elements. It consists of a tube bundle made of fluororesin tubes and a fluororesin adapter fitted to the end of this tube bundle, and the fluororesin adapter has screw parts and pipe connector parts formed on the outer peripheral surface.
And these are located outside the vacuum chamber
And a cylindrical body part that is continuously installed on this body part
A flange part that can be located inside the vacuum chamber
The degassing device is characterized in that a locking projection for fixing the flange portion is formed on the inner wall of the vacuum chamber. The invention of claim 2 provides a deaerator in which the tube bundle and the fluororesin adapter are joined and integrated via a heat-fusible fluororesin powder.

[0010]

Since the locking projection is provided on the inner wall of the vacuum chamber, the flange of the adapter is fixed by burying the tip of the locking projection in the flange of the adapter. Therefore, when connecting the liquid supply pipe to the pipe connector portion of the degassing element, the adapter does not run idle or shift its position, and the connection work becomes good. Moreover, the tube is not damaged at the time of connection, and the sealing property of the vacuum chamber is improved.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred structure of the deaerator according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing an example of a degassing element 2 used in the degassing apparatus of the present invention. As shown in the figure, the degassing element 2 used in the present invention includes a tube bundle 11 composed of a plurality of fluororesin tubes 10 and a fluororesin adapter 12 fitted to an end of the tube bundle 11. Is formed by.

Here, as the fluororesin constituting the fluororesin tube 10 and the fluororesin adapter 12, specifically, polytetrafluoroethylene (PTF) is used.
E), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-tetrafluoropropylene copolymer (FE
P), ethylene-tetrafluoroethylene copolymer (E
TFE), polychlorotrifluoroethylene copolymer (PCTFE) and the like can be exemplified, but the invention is not particularly limited. Fluororesin tube bundle 1
The number of the fluororesin tubes 10 constituting one is not particularly limited, and any number such as several tubes, dozens, and hundreds can be appropriately selected according to the purpose of use.

The fluororesin adapter 12 is composed of a tubular body portion 12b and a flange portion 12c provided at the tip of the body portion 12b. The outer peripheral surface of the body portion 12b has a threaded portion 12d and a pipe connector portion. 12e are formed respectively. Such a fluororesin adapter 1
The tube bundle 1 is a tube bundle 1 which is fused at the end of the tube bundle 11 through a fluororesin powder 13 having a heat fusion property.
It is joined and integrated with 1. Here, as the fluororesin powder having heat fusion property, FEP, PTFE, PFA, ETF
The powder such as E is not particularly limited, and any powder can be preferably used.

To specifically form the tube bundle 11,
For example, a large number of small-diameter tubes are aligned and each tube 1
A method of spraying the heat-fusible fluororesin powder as described above on the outer peripheral surface of the end of No. 0, and heating and pressurizing the sprayed part to integrally fuse the tubes 10 with each other via the fluororesin powder. It can be illustrated. In addition, at the time of this integration,
In order to prevent the deformation of the tube, a pressure resistant core material such as a metal wire or a metal rod may be inserted into the tube, or a mold may be externally inserted at the end. A fluororesin adapter 12 is inserted into the end portion of the tube bundle 11 thus obtained, and the degassing element 2 is joined and integrated through the fluororesin powder 13 similar to the above. That is, one opening of the cylindrical adapter 12 is used as the insertion hole 12a, and the tube bundle 11 is inserted into the insertion hole 12a.
The tube bundle 11 is arranged so that the joint end of
Fluororesin powder 13 in the gap between the inner wall of the adapter and the adapter 12
And degassing element 2 by heating and fusing together
Is formed. In the present invention, as the cylindrical adapter 12, one having heat shrinkability is used, and the tube bundle 11 and the adapter 12 are joined by the heat fusion property of the fluororesin powder and the heat shrinkage force of the adapter 12. A method of integration can also be preferably adopted.

The degassing element 2 as described above is inserted into the connection port 30 of the vacuum chamber 3 as shown in FIGS. More specifically, the body 12b of the adapter 12 of the degassing element 2 is inserted through the connection port 30 of the vacuum chamber 3, and the flange 12c of the adapter 12 is inserted into the vacuum chamber 3.
Connect the screw portion 12d and the pipe connector portion 12e to the connection port 3
It is arranged so as to project out of the vacuum chamber 3 from 0. Further, in order to maintain the vacuum inside the vacuum chamber 3, an O-ring 5 is formed in the gap between the inner wall 31 and the adapter 12.
5 is installed, and the nut 4 is attached to the threaded portion 12d of the adapter.
Are fitted and the degassing element 2 is fixed to the connection port 30.

In the deaerator 1 having such a structure,
The hold-up amount of the processing liquid in the degassing device can be reduced, and the adapter 12 for connecting the tube bundle 11 to the vacuum chamber 3 can be made compact, so that a large effective film area can be taken. it can. In the degassing apparatus 1 as described above, according to the present invention, the locking projection 3a for fixing the flange portion 12c of the adapter is formed on the inner wall 31 of the vacuum chamber 3, and the flange portion 12c is formed through the locking projection 3a. It is fixed at 31. By providing the locking projection 3a in this way, the flange portion 12c of the adapter is fixed, and when the liquid delivery pipe (not shown) is connected to the degassing element 2, the flange portion 12c runs idle or shifts in position. Will not cause.

[0017]

EXAMPLES The effects of the deaerator according to the present invention will be described below in more detail by giving examples. However, the present invention is not limited to the following examples.

(Example 1) Inner diameter 0.5 mm, outer diameter 0.8
A mold is externally attached to one end of a tube bundle obtained by bundling 150 PTFE tubes of 28 mm in length and 28 cm in length, and PFA powder is sprinkled on the outer peripheral surface of the end of each tube at a temperature of 370 ° C. Was heated and pressed for 10 minutes, and the tubes were fused and integrated with each other through the powder to obtain a tube bundle having a circular cross section. On the other hand, separately from this, a PTFE adapter composed of a tubular body portion having a screw portion and a pipe connector portion formed on the outer peripheral surface as shown in FIG. 1 and a flange portion formed at the tip of the body portion is provided. Prepare, insert the tube bundle after fusion bonding into the opening of this adapter as shown in FIG. 1, place a mold on the opening of the adapter, heat and pressurize at a temperature of 370 ° C. for 20 minutes, The tube bundle and the adapter were fused and integrated to obtain a degassing element having an effective tube length of 20 cm as shown in FIG. This degassing element was arranged at the connection port of the vacuum chamber as shown in FIG. 3 so that the flange portion was located inside the system of the vacuum chamber, and the screw portion and the pipe adapter portion were located outside the system. In addition, a locking protrusion was formed on the inner wall of the vacuum chamber, and the formed protrusion was inserted into the flange portion of the adapter to fix the adapter. Further, an O-ring was installed in the gap between the vacuum chamber and the flange to maintain the vacuum in the vacuum chamber, and a nut was fitted in the screw part of the adapter to fix the degassing element to form a degassing device. . When a liquid delivery pipe was connected to this deaerator, the adapter did not run idle and the pipe could be easily connected. Furthermore, the tube inside the deaerator was not damaged.

[0019]

As described in detail above, according to the present invention, in a degassing device in which a degassing element is inserted through a connection port of a vacuum chamber, the degassing element is a tube bundle composed of a plurality of fluororesin tubes. A fluororesin adapter fitted to the end of the tube bundle, the fluororesin adapter having a threaded portion and a pipe connector portion formed on the outer peripheral surface thereof and a vacuum chamber.
The cylindrical body that is located outside the bar and the body that is connected to this body.
It is installed continuously and located inside the vacuum chamber.
The degassing device is characterized in that a locking projection for fixing the flange is formed on the inner wall of the vacuum chamber. When connecting and, the degassing element does not run idle or shift in position in the connection port of the vacuum chamber, and workability is good,
Moreover, the sealability and the durability of the degassing tube are very good, the holdup amount of the degassing treatment liquid can be reduced, and a large effective film area can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a degassing element used in a degassing apparatus of the present invention.

FIG. 2 is a partially enlarged sectional view of an embodiment of the deaerator of the present invention.

FIG. 3 is a sectional view of an embodiment of the deaerator of the present invention.

FIG. 4 is a cross-sectional view showing an example of a degassing element in a conventional degassing device.

FIG. 5 is a cross-sectional view showing an example of a conventional degassing device.

FIG. 6 is a partially enlarged cross-sectional view showing another example of the conventional deaerator.

FIG. 7 is a cross-sectional view showing another adapter used in the conventional deaerator.

8 is a partial enlarged cross-sectional view showing an example of a degassing device using the adapter shown in FIG.

9 is a cross-sectional view showing an example of a degassing device using the adapter shown in FIG.

[Explanation of symbols]

1 deaerator 10 tubes 11 tube bundle 12 Adapter 12b torso 12c Flange part 12d screw part 12e Pipe connector part 13 Heat-fusible fluororesin powder 2 degassing element 3 vacuum chamber 30 connection 31 inner wall 3a Locking protrusion

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Claims (2)

(57) [Claims] 1. A degassing device having a degassing element inserted through a connection port of a vacuum chamber, wherein the degassing element is fitted with a tube bundle made of a plurality of fluororesin tubes and an end portion of the tube bundle. And a fluororesin adapter, wherein the fluororesin adapter has a screw part and a pipe connector part formed on the outer peripheral surface.
Both are cylindrical so that they are located outside the vacuum chamber
The body of the
Consisting of a flange located inside the chamber,
A degassing device, wherein a locking projection for fixing the flange portion is formed on the inner wall of the vacuum chamber. 2. The deaerator according to claim 1, wherein the tube bundle and the fluororesin adapter are joined and integrated via a heat-fusible fluororesin powder.