JP3068943U - Vacuum deaerator - Google Patents

Abstract

(57) [Problem] To provide a predetermined degassing effect efficiently even if a degassing tube is formed short and thin, and particularly useful when a liquid to be degassed is small or expensive. Providing air conditioning equipment. SOLUTION: In a vacuum deaerator in which dissolved gas is deaerated from a liquid flowing in a deaeration tube 3 by depressurizing a vacuum vessel 1, the deaeration tube 3 removes only gas. Each of the tubes is formed to be thinner than one long degassing tube that exhibits a predetermined degassing effect. The length formed is substantially the same as or longer than one long degassing tube exhibiting a predetermined degassing effect, and each tube has a wire 6 in the longitudinal direction.
And a gap 7 is formed between the outer peripheral surface of the wire and the inner peripheral surface of the tube to allow the deaerated liquid to flow.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 In the present invention, a degassing tube formed of a tube (hollow tube) made of a material having a property of passing gas only and preventing liquid permeation is installed in a vacuum container, and the pressure in the vacuum container is reduced. The present invention relates to a vacuum deaerator for degassing a dissolved gas through a degassing tube while the degassed liquid flows through the degassing tube by flowing the liquid to be degassed in the degassing tube. Things. This type of vacuum degassing device is used for various kinds of physics and chemistry / analysis equipment, for example, for removing (degassing) a gas dissolved in a reagent solution (solvent, sample solution, etc.) during transfer in a liquid chromatograph, Used for removing dissolved gases from liquids (liquids to be degassed) in various production process facilities such as pharmaceuticals and semiconductors.

[0002]

[Prior art]

 In this type of vacuum deaerator, in order to improve the deaeration efficiency, the liquid to be deaerated flowing through the deaeration tube is placed on the membrane surface (the inner circumference of the tube) rather than the center of the deaeration tube. It is preferable to move the position as close as possible to the plane (1). Therefore, as disclosed in Japanese Utility Model Publication No. 63-49285, by installing a wire inside the degassing tube, the degassed liquid that would otherwise flow through the center of the degassing tube is degassed. A degassing tube designed to move the position as close as possible to the inner peripheral surface of the tube has been proposed. However, as a practical matter, when a wire is incorporated in the tube, the flow resistance of the liquid to be degassed increases and the pressure loss increases, so that the overall degassing efficiency, that is, for a given amount of liquid to be degassed, The overall degassing efficiency, including the time required to obtain the predetermined degassing effect, is reduced. In order to improve this point, it is conceivable to use a larger pump as the liquid sending pump for flowing the liquid to be degassed. However, doing so increases the size and cost of the apparatus. On the other hand, especially in analytical techniques such as liquid chromatography, it is strongly desired to use only a small amount of reagents, that is, to reduce the amount of required samples from the viewpoint of reducing the load of sample collection and protecting the global environment.

[0003]

[Problems to be solved by the invention]

 In order to solve such a conventional problem and respond to the demand, the present invention has devised such a method that the liquid to be degassed flowing through the degassing tube moves near the inner peripheral surface of the degassing tube. By using the degassing tube, the entire time including the time required to obtain the specified degassing effect for the specified amount of liquid to be degassed is better than when using a single long degassing tube. The degassing efficiency can be improved, and the internal volume of the entire degassing tube used can be significantly reduced. As a result, especially when the liquid to be degassed is small or expensive, It is intended to provide a useful vacuum deaerator.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the vacuum degassing device of the present invention is provided with a degassing tube in a vacuum vessel, and decompresses the inside of the vacuum vessel to dissolve the liquid flowing through the degassing tube. In a vacuum degassing apparatus designed to degas a gas, the degassing tube is composed of a plurality of tubes that allow only gas to pass and prevent liquid from permeating, and each tube exhibits a predetermined degassing effect. Each of the tubes is formed to be thinner than one long degassing tube, and the total length of each tube is almost the same as or longer than one long degassing tube exhibiting a predetermined degassing effect. It is characterized in that a wire is built in the tube in the longitudinal direction, and a gap is formed between the outer peripheral surface of the wire and the inner peripheral surface of the tube to allow the liquid to be degassed to flow. .

[0005]

[Embodiment of the invention]

 Hereinafter, specific and preferred embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the illustrated embodiments.

The vacuum deaerator according to the present invention basically includes a vacuum vessel 1, a vacuum pump 2 for depressurizing the inside of the vacuum vessel 1, and a housed and installed in the vacuum vessel 1, as in the prior art. A degassing tube 3 for flowing the liquid to be degassed, etc., and further, if necessary, a pressure sensor 4 for detecting the degree of decompression inside the vacuum vessel 1, a vacuum vessel 1 and a vacuum pump 2 A non-return valve 5 and the like, which are installed at a fixed pressure and operate at a constant pressure, are added, and external equipment such as a liquid chromatograph is connected to the liquid inlet 31 and the liquid outlet 32 of the deaeration tube 3. .

The degassing tube 3 is formed into a hollow tube (tube shape) having a required inner diameter and length by using a known material that allows only a gas made of, for example, a fluororesin polymer or the like to block a liquid from permeating. Are formed by bundling a plurality of tubes 3a, 3b,... Formed in parallel, and the liquid inlet portion and the liquid outlet portion of each tube 3a, 3b,. The liquid inlet 31 and the liquid outlet 32 are respectively set facing the outside of the vacuum vessel 1, and the liquid L to be degassed is supplied to the degassing tube 3 while the inside of the vacuum vessel 1 is controlled by the vacuum pump 2 under reduced pressure. When flowing from the liquid inlet 31 into the degassing tube 3, the dissolved liquid is degassed from the liquid to be degassed while coming out of the liquid outlet 32.

In addition, a wire 6 is built in each of the tubes 3a, 3b,... Along a longitudinal direction thereof, and is covered between an outer peripheral surface of the wire 6 and an inner peripheral surface of the tubes 3a, 3b,. A void 7 for flowing the degassed liquid L is formed.

The wire 6 is formed by using a metal wire or a resin wire and having an outer diameter equal to or slightly smaller than the inner diameter of the tubes 3a, 3b,. Along (almost the entire length of the tubes 3a, 3b,...) And built therein, and a gap 7 for flowing a liquid between the outer peripheral surface of the wire 6 and the inner peripheral surface of the tubes 3a, 3b,. To form. Therefore, the cross-sectional shape of the wire 6 is not limited as long as it can form a gap 7 for flowing a liquid between the outer peripheral surface of the inserted wire 6 and the inner peripheral surfaces of the tubes 3a, 3b,. The cross-sectional shape may be a circular shape, an elliptical shape, a polygonal shape such as a triangular shape or a quadrangular shape as shown in the illustrated example, or a twisted and formed plural wires.

Each of the tubes 3a, 3b,... Constituting the degassing tube 3 has a smaller inner diameter than one long degassing tube that exhibits a predetermined degassing effect. The total length of each of the tubes 3a, 3b,... Exhibits a predetermined degassing effect. The length is substantially the same as or longer than one long degassing tube.

[0011]

[Effects of the invention]

 Thus, in the vacuum degassing device of the present invention, the degassing tube is composed of a plurality of tubes that pass only gas and prevent the passage of liquid, and each tube has a predetermined degassing effect. Each degassing tube is formed to be thinner than the long degassing tube, and the total length of each tube is almost the same as or longer than one long degassing tube exhibiting the predetermined degassing effect. In this case, a gap is formed between the outer peripheral surface of the wire and the inner peripheral surface of the tube so as to form a gap for flowing the liquid to be degassed. Play. (1) When observing each tube, the degassed liquid moving in the center of the tube, which would flow at a position far away from the inner peripheral surface of the tube if there is no wire rod, is placed at a position as close as possible to the inner peripheral surface of the tube. The area of the tube membrane that contributes to degassing, that is, the area of the inner circumferential surface of the tube, is independent of the presence or absence of the wire unless the outer circumferential surface of the wire is in contact with the inner circumferential surface of the tube. Since it is the same, the deaeration efficiency can be greatly improved when compared with a tube having the same inner diameter (for deaeration), and if the predetermined deaeration effect and efficiency are satisfactory, use is possible (deaeration). For example, the length of the tube can be made shorter and thinner. (2) Compared to the case where a single long degassing tube is used to expect a predetermined degassing effect, the length of each tube is shorter and thinner, and the entire length is predetermined. It is possible to obtain a degassing effect. Therefore, even if the pressure loss per one tube is increased due to the incorporation of the wire rod in each tube, since each tube is short, the overall deaeration efficiency (a predetermined amount of liquid to be deaerated is determined). Not only does the overall degassing efficiency, including the time required to achieve the degassing effect, decrease, but also a large pump is used as a liquid pump for flowing the liquid to be degassed. It is not necessary, and it is possible to reduce the size of the entire device. (3) Further, it is possible to reduce the internal volume of the entire degassing tube through which the liquid to be degassed flows without lowering the degassing effect and efficiency. As a result, the time required for degassing can be shortened, the work efficiency for degassing can be improved, and the replacement of reagent solutions (solvents and sample solutions, etc.) performed in liquid chromatography, for example, can be improved. It is possible to quickly (shortly) clean the inside of the tube (for deaeration), such as for cleaning. (4) In addition, since the internal volume of the entire degassing tube can be reduced, the amount of liquid to be degassed is small, such as a reagent solution (solvent or sample solution) used for liquid chromatography. The liquid to be degassed can be used effectively without waste even in the case of expensive or expensive, so that it is possible to reduce the amount of required sample and, consequently, the load of sampling.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of the present invention.

FIG. 2A is an enlarged schematic view of a portion A in FIG. 1,
(B) shows a schematic sectional view thereof.

[Explanation of symbols]

1: Vacuum container 2: Vacuum pump 3: Degassing tube 3a, 3b: (Degassing) tube 31: Liquid inlet 32: Liquid outlet 4: Pressure sensor 5: Check valve 6: Wire rod 7: Void

Claims (1)

[Utility model registration claims] 1. A degassing tube is installed in a vacuum vessel,
In a vacuum deaerator in which dissolved gas is deaerated from the liquid flowing in the deaeration tube by reducing the pressure in the vacuum vessel, the deaeration tube passes only the gas and transmits the liquid. Each tube is formed thinner than one long deaeration tube that exhibits a predetermined deaeration effect, and the total length of each tube is a predetermined deaeration. It is formed to be almost the same as or longer than one long deaeration tube that exerts an effect, and each tube has a built-in wire in the longitudinal direction so that the tube can be detached between the outer peripheral surface of the wire and the inner peripheral surface of the tube. A vacuum degassing device characterized by forming a gap for flowing gas-liquid.