RU2223474C1 - Device for extraction of liquid dose - Google Patents

Abstract

FIELD: procedure of separation and cleaning of complex liquid mixtures, applicable for dosage of reagents in liquid chromatography. SUBSTANCE: the device has a vessel with liquid to be metered out placed above an intermediate vessel. The latter is made with concave walls and with a rotary tube installed inside it. The rotary tube has a drive and can be moved in several degrees of freedom. The inlet opening of the rotary tube may change its level with respect to the upper level of liquid in the intermediate vessel. The device has a duct for delivery of gas-displacer, and a duct for delivery of a liquid dose passing through a selector valve positioned between the vessel with liquid to be metered out and the intermediate measuring vessel. In addition the device has one or several intermediate measuring vessels installed for connection to the duct for delivery of gas-displacer and the duct for delivery of liquid dose through the selector valve controlled with the aid of detectors of gas phase installed at the outlet of the rotary tubes. EFFECT: enhanced capacity due to provision of continuity of liquid flow, reduced error of the dosage of reagents to the chromatograph. 1 dwg

Description

 The invention relates to the technology of separation and purification of complex liquid mixtures and can be used for dosing of reagents in liquid chromatography.

 A device for introducing a liquid sample [1] is known, which comprises a container with a dosed liquid, a calibrated gas container, a tap-switch, a channel for supplying a carrier gas, an intermediate measured tank.

 The principle of operation of the device is based on preliminary and accurate installation of the volume of gas inert to the dosed liquid, displacement of the proportional volume of the liquid from the tank by the installed gas volume to the measuring device for visual inspection, followed by the evacuation of the dosed volume of the liquid by the flow of inert gas to the destination.

 The device has high reliability when working with aggressive liquids in automatic mode, has a wide dosage range. It is used, for example, in the automatic input of the separated liquids on a preparative chromatograph "Etalon - 2" [2].

 The disadvantage of this device is the change in the initial pressure in the dosing system due to a change in the difference in the heights of the liquid in the measuring device and capacity as the latter is worked out. This increases the dosing error or requires the introduction of an additional corrective link in the control system, as well as the discreteness of dosing.

 A device for selecting a dose of liquid [3], containing a container with a dosed liquid, placed above an intermediate measuring tank made with concave walls and mounted inside it with a rotary tube having a drive and the ability to move in several degrees of freedom, while the inlet of the rotary tube can change its level with respect to the upper liquid level in the intermediate tank, a channel for supplying a propellant and a channel for supplying a dosed liquid passing through a switch tap b, located between the container with the dosed liquid and the intermediate measuring tank.

 The device [3] is the closest to the technical solutions proposed. The disadvantage of the prototype is the discreteness of dosing, which reduces the performance of the fluid supply and the penetration of the propellant into the flow of the dosed liquid, which is unacceptable in liquid chromatography.

 The aim of the invention is to increase the productivity of the device due to the continuity of the fluid flow.

 This goal is achieved by the fact that in a device for selecting a dose of liquid containing a container with a dosed liquid, placed above an intermediate measuring container made with concave walls and mounted inside its rotary tube, having a drive and the ability to move in several degrees of freedom, while the input the hole of the rotary tube can change its level with respect to the upper level of the liquid in the intermediate tank, a channel for supplying a propellant and a channel for supplying a liquid dose passing through h switch valve located between the container with the dosed liquid and the intermediate measuring tank, one or more intermediate measuring tanks are installed, which are installed with the possibility of connection with the feed channel of the propellant and the feed channel of the liquid dose through the switch valve, controlled by gas detectors phase installed at the exit of the rotary tubes.

 The drawing shows a schematic diagram of a device.

 The device comprises a container 1 with a dosed liquid, a channel 2 for supplying a propellant gas, a crane switch 3, intermediate measuring tanks 4, 8, rotary tubes 5, 9, dose rate indicators 6, 12, actuators 7, 13, a channel for withdrawing the dosed liquid 14, a channel for supplying a liquid dose 15, detectors for the presence of a propellant in the liquid stream 10, 11.

 The device operates as follows.

 The container with the dosed liquid 1 is connected by a switch tap 3 with an intermediate tank 4, the upper levels of the tanks 1 and 4 being connected to each other, and the lower level of the tank 1 through the channel 15 and the detector for the presence of propellant 10 connected to the rotary tube 5. On the actuator 7 the rotation angle is set, and the rotary tube 5 is set at its input to the level of the corresponding volume. Monitoring the installation of the dosed volume of liquid is carried out using a dose indicator 6.

 At the same time, the intermediate tank 8 is connected through the switch-switch 3 to the channel 2 of the propellant, and the output of the rotary tube 9 to the channel 14 of the output of the liquid dose, the value of which is set by the rotary tube 9 by the drive 13 according to the pointer 12.

 So, in one position of the switch tap 3, the intermediate measuring tank 4 is filled with dosed liquid and a dose of liquid is removed from the other measuring tank 8 with a propellant gas, which, reaching the detector 11 (the detector can be, for example, optical or ultrasonic), will cause the control a signal that changes the position of the valve switch 3, preventing the gas phase from entering the flow of the dosed liquid. The intermediate measuring tank 8 through the channel 15, the detector 11, the swivel tube 9 will be filled with the dosed liquid, and from the intermediate measuring tank 4 the propellant through the channel 2, the swivel tube 5, the detector for the presence of the gas phase 10 and the outlet channel 14, the dispensed liquid passes to the place destination.

 At the signal of the detector 10, the faucet switch 3 returns to its original position, creating a continuous flow of fluid with greater productivity over time.

Sources of information
1. A.S.SSSR 243950, class G 01 N 1/10, 1967.

 2. Prospect for the "Automatic preparative gas chromatograph" Etalon - 2 ", company OKBA Dzerzhinsk, Gorky region, 1968

 3. RF patent 2016389, M.cl. 5 G 01 N 1/10, 1990 - prototype.

Claims (1)

A device for sampling a dose of liquid, containing a container with a dosed liquid, placed above an intermediate measuring container made with concave walls and with a rotary tube installed inside it, having a drive and the ability to move in several degrees of freedom, while the inlet of the rotary tube can change its the level with respect to the upper liquid level in the intermediate tank, the channel for supplying the propellant and the channel for supplying the liquid dose passing through the faucet are located d between the container with the dosed liquid and the intermediate measured tank, characterized in that one or more intermediate measured tanks are installed in the device, which are installed with the possibility of connection with the feed channel of the propellant and the channel of the liquid dose through the switch tap controlled by detectors gas phase installed at the exit of the rotary tubes.