JPH11333205A - Vacuum deaerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely prevent mutual interference caused by repermeation of a deaerated and discharged gas even when a plurality of gasses to be deaerated are deaerated at the same time, and to provide a vacuum deaerator which has a simple and small structure and is inexpensive. SOLUTION: In this device, permeable membranes 3a and 3b which pass only a gas but inhibit the permeation of a liquid are respectively installed in vacuum vessels 1a and 1b, and a vacuum pump 2 reduces pressure in the vacuum vessels to deaerate a dissolved gas from a liquid to be deaerated through the permeable membranes. In this case, the vacuum vessels 1a and 1b provided with the permeable membranes 3a and 3b are respectively connected with heads 21a and 21b of one vacuum pump.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum container provided with a permeable membrane for allowing only gas to pass therethrough and preventing the permeation of a liquid. More particularly, the present invention relates to a vacuum degassing apparatus suitable for degassing a plurality of liquids to be degassed at the same time.

[0002]

2. Description of the Related Art In an analyzer or a test apparatus such as a liquid chromatograph, a dissolved gas is previously degassed online from a sample solution, a solvent, a buffer, etc. in order to improve the accuracy of analysis and measurement. By providing a tubular permeable membrane that allows only gas to pass through the inside of the vacuum vessel to prevent liquid permeation, and circulating a solvent or control solution through the tubular permeable membrane while depressurizing the inside of the vacuum vessel with a vacuum pump. A vacuum degasser is used to degas dissolved gas online through the permeable membrane.

However, when a plurality of liquids to be degassed are simultaneously degassed, conventionally, as shown in FIG. 3, a plurality (set) of tubes are provided inside one vacuum vessel 1 'connected to a vacuum pump 2'. The permeable membranes 3a 'and 3b' are provided, and the liquid to be degassed is allowed to flow through each of the tubular permeable membranes 3a 'and 3b' while the inside of the vacuum vessel 1 'is depressurized by the vacuum pump 2', thereby simultaneously desorbing. I was taking care. For this reason, the gas degassed and discharged into the vacuum vessel through each tubular permeable membrane may re-permeate through the tubular permeable membrane and flow into the vacuum vessel, causing mutual interference.

In order to solve such a problem, a plurality of vacuum containers having a tubular permeable membrane therein are controlled by a single vacuum pump to reduce the pressure, and a pressure adjusting chamber is provided between each vacuum container and the vacuum pump. A deaeration device provided has been proposed (see JP-A-8-332307). However, even in this deaerator, the insides of the plurality of vacuum vessels are in communication with each other via the pressure adjusting chamber and the vacuum pump, and the mutual interference by the degassed and discharged gas cannot be completely eliminated. was there.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem. Even when a plurality of liquids to be degassed are simultaneously degassed, the degassed / discharged gas is not removed. An object of the present invention is to provide a vacuum deaerator which has no danger of causing mutual interference due to re-transmission, and has a simple structure, small size and inexpensive manufacture.

[0006]

In order to achieve the above object, a vacuum deaerator of the present invention is provided with a permeable membrane which allows only gas to pass therethrough and blocks liquid permeation, and evacuates the inside of the vacuum container. In a vacuum degassing apparatus for degassing a dissolved gas from a liquid to be degassed through the permeable membrane by depressurizing with a pump, a vacuum vessel provided with the permeable membrane in each head of a single vacuum pump having a plurality of heads Is characterized by being connected. At this time, some of the heads in one vacuum pump having a plurality of heads are connected in series or in parallel, and the vacuum vessel having the permeable membrane is connected to each of the heads connected in series or in parallel. You may do it.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of the present invention will be described in detail with reference to FIGS. In the figure, 1a,
Reference numeral 1b denotes an independent vacuum container, and reference numeral 2 denotes a vacuum pump for reducing the pressure inside the vacuum containers 1a and 1b. In the first embodiment shown in FIG. 1, two vacuum vessels 1a and 1b are connected to one vacuum pump 2, but the present invention is not limited to such an embodiment. It will be readily understood from the following description that more than one vacuum vessel can be connected.

In each of the vacuum vessels 1a, 1b, a permeable membrane 3a, 3b, which allows only gas to pass therethrough to a portion in contact with a liquid to be degassed such as a sample liquid, a solvent, a buffer, etc.
3b are provided. The permeable membranes 3a and 3b are formed in a tube shape, a film shape, or a film shape using a known material such as a fluororesin polymer, and
a, 1b.

In the case of the first embodiment shown in FIG. 1, one or a plurality of permeable membranes 3a and 3b each having a required length and formed in a tube shape are used inside each of the vacuum vessels 1a and 1b. And the liquid inlets 31a, 31b at one end thereof.
And the liquid outlets 32a and 32b at the other end face the outside of the vacuum vessels 1a and 1b, and the inside of each of the vacuum vessels 1a and 1b is controlled by a single vacuum pump 2 to reduce the pressure of the liquid to be degassed. From the inlets 31a, 31b, respectively, the tubular permeable membrane 3
The liquid is circulated in the liquids a and 3b and degassed simultaneously from the liquids to be degassed while coming out of the liquid outlets 32a and 32b. In the drawings, reference numerals 4a and 4b denote pressure sensors, and reference numerals 5a and 5b denote check valves which operate at a constant pressure.
a, 4b and the check valves 5a, 5b, the vacuum vessel 1
It becomes easy to control the pressure inside a and 1b accurately and accurately.

The plurality of vacuum vessels 1a and 1b are connected to one vacuum pump 2 through conduits 6a and 6b, respectively, and one vacuum pump 2 has a plurality of heads (this embodiment). In this case, two heads 21a and 21b are provided, and the respective vacuum vessels 1a and 1b are connected to the respective heads 21a and 21b independently via the respective conduits 6a and 6b. As the vacuum pump 2, any vacuum pump having a head of a diaphragm type, a vane type, a gear type or the like can be applied to the present invention.

When the vacuum pump 2 is operated, the pressure inside each of the vacuum vessels 1a and 1b is reduced.
In this state, when the liquid to be degassed flows from the liquid inlets 31a, 31b of the vacuum vessels 1a, 1b into the respective tubular permeable membranes 3a, 3b, the liquid to be degassed flows out of the liquid outlets 32a, 32b. The dissolved gas is degassed from the liquid to be degassed through the tubular permeable membranes 3a and 3b and discharged into the respective vacuum vessels 1a and 1b.

Next, a description will be given of a second embodiment shown in FIG. 2. The same components as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and overlapping description will be omitted. The second embodiment has a plurality of heads (4 in the illustrated embodiment).
(In the illustrated embodiment, heads 21a and 21b and heads 21c and 21d) are connected in series with one another in a single vacuum pump 2 including two heads 21a, 21b, 21c, and 21d. Pipe line 6 for each head connected in series
a, 6b, 6c, 6d are provided with tubular permeable membranes 3a, 3b.
Are connected to each other.

As a modification of the second embodiment, some of the heads in one vacuum pump 2 having a plurality of heads 21a, 21b, 21c, 21d are connected in parallel and connected in parallel. Pipes 6a, 6b, 6c, 6
vacuum container 1 provided with tubular permeable membranes 3a and 3b
a and 1b may be connected.

[0014]

As described above, in the vacuum degassing apparatus according to the first aspect of the present invention, a permeable membrane that allows only gas to pass therethrough and blocks liquid permeation is provided in the vacuum vessel, and the inside of the vacuum vessel is depressurized by a vacuum pump. In the vacuum degassing apparatus for degassing the dissolved gas from the liquid to be degassed through the permeable membrane by connecting the vacuum vessel having the permeable membrane to each head of one vacuum pump having a plurality of heads, Therefore, not only can different types of degassed liquids be simultaneously degassed, but also the paths through which each degassed liquid is degassed and discharged are completely independent from the vacuum vessel to the vacuum pump. Therefore, even if degassing is performed simultaneously from multiple types of degassed liquids of different types, there is no danger that the degassed and discharged gas will cause mutual interference, and high-precision analysis and measurement are expected. become able to.

In addition, since the paths for degassing and discharging each liquid to be degassed are completely independent from the vacuum vessel to the vacuum pump, only one vacuum pump is required.
The structure is simple and small, and can be manufactured at low cost.

Further, in the vacuum degassing apparatus according to the first aspect of the present invention, some of the heads in one vacuum pump having a plurality of heads are connected in series or in parallel, and are connected in series or in parallel. Since the vacuum vessel provided with the permeable membrane is connected to each of the heads, in addition to the effect of the vacuum deaerator according to claim 1, some of the heads in the vacuum pump are connected in series. If a vacuum vessel equipped with a permeable membrane is connected to the head, the degree of vacuum in the vacuum vessel can be increased, and the degassing performance can be improved.
If a vacuum vessel equipped with a permeable membrane is connected to a head in which some heads in a vacuum pump are connected in parallel,
The displacement is increased, and the deaeration performance can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a first embodiment of the present invention.

FIG. 2 is a schematic view showing a second embodiment of the present invention.

FIG. 3 is a schematic view showing a conventional example.

[Explanation of symbols]

 1a, 1b: vacuum container 2: vacuum pump 21a, 21b, 21c, 21d: head 3a, 3b: permeable membrane (tubular permeable membrane) 4a, 4b: pressure sensor 5a, 5b: check valve 6a, 6b, 6c, 6d: pipeline

Claims (2)

[Claims] A permeable membrane that allows only gas to pass therethrough and prevents liquid permeation is provided in a vacuum vessel, and the inside of the vacuum vessel is depressurized by a vacuum pump to degas dissolved gas from the liquid to be degassed through the permeable membrane. A vacuum degassing device comprising: a vacuum pump having a permeable membrane connected to each head of a single vacuum pump having a plurality of heads. 2. A permeable membrane that allows only gas to pass therethrough and prevents liquid permeation is provided in a vacuum vessel, and the inside of the vacuum vessel is depressurized by a vacuum pump to degas dissolved gas from the liquid to be degassed through the permeable membrane. In a vacuum degassing apparatus, a vacuum vessel provided with the permeable membrane in each of the heads connected in series or in parallel in a single vacuum pump having a plurality of heads and connected in series or in parallel A vacuum deaerator characterized by being connected to