JP2597488Y2 - Liquid sampling valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid sampling valve used in a process gas chromatograph.

[0002]

2. Description of the Related Art Process gas chromatographs are used for analyzing components of raw materials for processes and products (including intermediates) in plants such as petroleum refining and petrochemicals. 2. Description of the Related Art A liquid sampling valve is used in which a sample to be measured for analysis is taken out from an appropriate place in a passage, a predetermined amount is sampled from the passage, vaporized, and transported to an analyzer by a carrier gas.

Conventionally, as this type of liquid sampling valve, the one shown in FIG. 3 is known (for example, see US Pat. No. 4,487,080). FIG. 3 is a longitudinal sectional view showing a configuration of a conventional liquid sampling valve. In FIG. 3, the liquid sampling valve includes a body part 10, a driving part 30, a vaporizing part 400, and a stem 20 passing therethrough.

The body 10 has a cylindrical shape, and a cylindrical first sealing material 11 and a second sealing material 12 are formed from outside in the axial direction.
And a sample flow chamber 13 through which a liquid sample flows in a direction perpendicular to the axis thereof is provided with a first sealing material 11 and a second sealing material 12.
It is formed in the inside of it. Then, the driving unit 30 and the vaporizing unit 400 are connected to the body unit 10 via the first sealing material 11 and the second sealing material 12, respectively, and the airtightness of each other is maintained.

The stem 20 penetrates through the first seal member 11 and the second seal member 12 so as to be slidable in the axial direction, and
0 is connected to a piston 32 slidable in a cylinder 31 formed inside. A ring-shaped sample measuring groove 21 is formed on the outer peripheral surface of the stem 20.
Further, inside the vaporizing section 400, a vaporizing chamber 42 whose temperature is constantly controlled to about 100 to 250 ° C. by a built-in heater 41 is formed.

[0006] Then, the compressed air is introduced into and out of the cylinder 31 through the introduction and exit holes 33 and 34 provided in the drive section 30 and the piston 32 is driven, whereby the stem 20 is moved. The non-sampling state located in the sample circulation chamber 13 and the sampling state in which the sample is quantitatively collected and moved into the vaporization chamber 42 are repeated.

[0007] The vaporizing chamber 42 vaporizes the sample transferred by the sample measuring groove 21, while the carrier gas C
Is introduced into the vaporization chamber 42, and the carrier gas C conveys the vaporized sample to an analyzer (not shown).

When such a liquid sampling valve is used, as shown in FIG. 4, between the sample point 55 of the process flow path 54 and the liquid sampling valve B and between the return point 56 and the liquid sampling valve B. Three-way valves 50 and 51 are provided respectively.

The three-way valves 50 and 51 are used for performing a normal analysis. The sample to be measured is diverted from the process flow path 54 and introduced into the liquid sampling valve B. When the calibration of the analyzer is performed, the calibration sample is
The flow path is switched so that the calibration sample that has been introduced and passed through is discharged to the drain.

When a calibration sample is selected, for example, as shown in FIG. 4, the calibration sample is supplied to the liquid sampling valve B via the calibration sample flow path 52 and the sample flow path 53.
And the remainder quantitatively collected by the liquid sampling valve B is discharged to the drain.

[0011]

In such a conventional technique, since the capacity of the sample flow chamber 13 and the piping capacity of the calibration sample flow channel 52 and the sample flow channel 53 are large, a large number of calibration samples are required. Therefore, when the calibration sample is expensive, there is a problem that the cost for the calibration increases.

[0012] The present invention has been made in view of the above-mentioned conventional problems.
An object of the present invention is to provide a liquid sampling valve that can calibrate an analyzer using a small amount of a calibration sample and can reduce the cost for calibration.

[0013]

In order to achieve the above object, the present invention has a cylindrical shape, in which a first sealing material and a second sealing material are housed at a distance from the outside in the axial direction, and the shaft thereof is provided. A body part in which a sample flow chamber through which a liquid sample flows in a vertical direction is formed, and the first seal material and the second seal material are slidably penetrated in the axial direction thereof; A stem formed with a sample measurement groove for quantitatively collecting the sample from the outer peripheral surface, a driving unit fixed to the body via the first sealant, and moving the stem in the axial direction, A vaporization chamber, in which the sample is transferred by moving the stem by the driving unit and vaporized and transported to the analyzer by a carrier gas, which is fixed to the body portion via a second sealant, is provided inside. And a vaporizing part to be formed. In the liquid sampling valve, a needle of a syringe for injecting a sample of an arbitrary liquid into the vaporization chamber is pierced, and a syringe injection port through which the needle is withdrawn while keeping the vaporization chamber airtight is provided in the vaporization unit. A liquid sampling valve characterized in that:

[0014]

In the present invention, the syringe inlet is provided in the vaporizing section, and the syringe for injecting a liquid sample into the vaporizing chamber is pierced, and the syringe is withdrawn while keeping the vaporizing chamber airtight. .

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings. In the following drawings, the same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

FIG. 1 is a longitudinal sectional view showing a specific embodiment of the present invention. 1, the liquid sampling valve is provided with a communication hole 43 communicating the outside and the inside of the vaporization chamber 42 of the liquid sampling valve shown in FIG. 3 in the vaporization section 40, and a syringe inlet 44 is buried in the communication hole 43. It is configured. The syringe injection port 44 is made of, for example, silicon rubber as an elastic body having heat resistance.

The liquid sampling valve is shown in FIG.
As shown in FIG.
The sample to be measured is diverted from 5 and constantly flown to the liquid sampling valve A, and the sample to be measured is passed through the process flow path 5.
4 is used in the system configuration returned to the return point 56.

When calibrating an analyzer (not shown) with such a system configuration, the sample measuring groove 2 of the stem 20 is used.
1 is placed in the sample flow chamber 13 to be in a non-sampling state, and the needle 6 of the syringe 60 from which the calibration sample is quantitatively collected.
1 is inserted through the syringe inlet 44.

Then, a calibration sample is injected into the vaporization chamber 42 from the syringe 60, and the calibration sample is vaporized in the vaporization chamber 42 and transported by the carrier gas C to the analyzer, where the analyzer is calibrated.

When a normal sample to be measured is measured, the needle 61 of the syringe 60 is pulled out from the syringe inlet 44.
Then, the sample measuring groove 21 of the stem 20 is inserted into the sample flow chamber 13.
The sample is moved from the inside to the inside of the vaporization chamber 42 to be in a sampling state, and the sample to be measured quantitatively collected in the sample measuring groove 21 is transferred to the vaporization chamber 42 to be vaporized and transported to the analyzer by the carrier gas C.

In this case, since the syringe inlet 44 is made of silicone rubber having heat resistance and elasticity,
By piercing the needle 61 of the syringe 60,
The airtightness of the vaporization chamber 42 can be maintained.

When the analyzer is calibrated by using the liquid sampling valve A, the calibration sample is supplied to the vaporization chamber 42 by an amount necessary for the calibration without passing through the sample circulation chamber or the flow path of the liquid sampling valve A. , The required amount can be extremely small. Further, since the conditions for vaporizing the calibration sample can be kept the same as the conditions for vaporizing the sample to be measured, the reliability of calibration can be maintained.

Further, a sample to be measured is taken out from the process flow path, is quantitatively collected by a syringe 60, and is taken out of the syringe inlet 44.
By injecting the sample into the vaporization chamber 42 and performing quantitative analysis on the sample, the sample to be measured from the process flow channel is quantitatively collected by the sample measuring groove 21 and compared with the result of the quantitative analysis, whereby the sample measuring groove 21 is used. It is also possible to calibrate the amount of the sample to be measured.

[0024]

[Effects of the Invention] As described above, the present invention is configured by providing a syringe injection port through which a syringe needle can be withdrawn and pierced in the vaporization section, so that the analyzer is calibrated using a small amount of calibration sample. Thus, a liquid sampling valve that can reduce the cost for calibration can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a specific embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a system using the liquid sampling valve shown in FIG.

FIG. 3 is a longitudinal sectional view showing a configuration of a conventional liquid sampling valve.

FIG. 4 is a schematic configuration diagram of a system that uses the liquid sampling valve shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Body part 13 Sample circulation chamber 20 Stem 30 Drive part 40 Vaporization part 42 Vaporization chamber 43 Communication hole 44 Syringe inlet 60 Syringe 61 Needle C Carrier gas

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01N 1/00 G01N 30/20

Claims (1)

(57) [Scope of request for utility model registration] A first sealing material and a second sealing material which are cylindrical and housed at a distance from an outer side in an axial direction thereof, and a sample flow chamber through which a liquid sample flows in a direction perpendicular to the axis is provided inside; A body portion to be formed, and a sample measurement groove for slidably penetrating the first seal material and the second seal material in the axial direction thereof and for quantitatively collecting the sample from the sample flow chamber are formed on the outer peripheral surface. Is fixed to the body portion via the first sealing material,
A drive unit for moving the stem in the axial direction thereof, fixed to the body unit via the second seal material,
A vaporization unit in which a vaporization chamber is formed in which the stem is moved by the drive unit and the sample is transferred, and in which a carrier gas to be vaporized and conveyed to the analyzer is formed, a liquid sampling valve comprising: A needle of a syringe for injecting a sample of any liquid into the vaporization chamber is pierced, and a syringe injection port from which the needle is withdrawn while keeping the vaporization chamber airtight is provided in the vaporization unit. Liquid sampling valve.