SU597965A1 - Syringe for metering liquids and gases into chromatograph - Google Patents

Description

(54) SYRINGES FOR DOSING LIQUIDS AND GASES

IN CHROMATOGRAPH

A syringe for dispensing liquids and gases into a chromatograph is made in the form of a cylindrical body 1, inside of which a movable piston 2 cd is housed. At the end of the housing 1, the nozzle 3 is fixedly fixed with a needle 4. In the nozzle for the passage of the product under investigation, there is a T-shaped channel connected to the needle by a part located along the central axis of the cylinder 1 and needle 4. A through part of the channel perpendicular to the central axis of the cylindrical body, provided with a movable capillary tube 5 made of an elastic material. The tube 5 in its middle part located inside the nozzle 3 relative to the axial channel is plugged from the inside, and at the bases of the plug 6 holes are made on the side facing the needle, one of which serves to connect the channel of the needle 4 to the internal cavity 7 of the body i when the other is intended to purge the needle and nozzle channels, for the open end of the tube it is in communication with the atmosphere, and the other is connected to the hole 8 located on the side of the nozzle body (Fig. 1 View A.)

The tightness of the tube 5 when typing, transferring and introducing a sample for analysis is ensured by the presence of sealing elements: elastic sleeves 9 and pressing their nuts 10.

To move the capillary tube 5, which carries out the process of switching in stages, set, cut off the sample in the cavity 7 of the syringe and enter it into the receiver, its open end is movably connected to the spring-loaded handle 11 by a slot that engages the tube 5 between the two hinges. 12, fixedly mounted on it. The length of the tube is chosen so that it does not hinder its movement.

The syringe works as follows.

Before taking a sample into the internal cavity 7 of the housing 1, the piston 2 fits tightly with the nozzle 3. Pressing the handle 11 until the stop moves the tube B from the right to the right in the through channel, thereby the hole location relative to the axial channel of the nozzle, In the leftmost position The tube opening connecting cavity 7 with the needle channel 4 will be placed in the axial channel, and the other will be located in the seal 9.

The syringe prepared for collection is brought to the vessel 13 with the test product in working condition: under pressure or vacuum. An elastic cap 14 is drawn and the piston 2 moves upwards to collect the sample in the required amount (Fig. 2a). After that, the handle is released, and under the action of the spring

grip tube 5. returns to its original position, i.e. when its open end communicates with the needle channel 4 through an opening in the tube located in the axial channel, and the other is in the seal (Fig. 1). The sample is cut off in the inner cavity and tube 5. Then the remnants of the sample that are in the channels of the nozzle and needle are blown into the drain. For this purpose, a source of compressed air or gas is supplied to the open end of the tube 5 (Fig. 26). When performing precision analyzes, the sample remains evacuated, after which the needle channel is purged with gas used as eluent.

The sample that was sampled for analysis without loss and bleeding into the surrounding space is transferred to chromatograph 15, where it is entered. A stub 16 is pierced with a needle; by pressing the handle 11, the cavity 7 is connected to the needle channel 4 and the sampled sample of the analyzed product under the action of the piston 2 forces the analysis into the chromatograph (Fig. 2c). If the work is carried out with toxic substances, before the needle is released from the cap 16. The open end of the capillary tube 5 is previously connected to a vacuum line or a stretch. When the needle 4 is released from the cap 16, the handle 11 is immediately released.

Using the proposed syringe compared to existing devices of similar purpose provides the following advantages:

higher dosing accuracy of samples at different pressures

eliminates the possibility of poisoning of the maintenance and surrounding personnel when working with toxic substances.

Claims (2)

1. A syringe for dispensing liquids and gases into a chromatograph containing a cylindrical body, a piston with a rod and a nozzle with a needle mounted on one end of the body, characterized in that, in order to improve the accuracy of dispensing samples that are at different pressures, inside the nozzle is made with a T-shaped channel connected to the needle with a part located along the central axis of the cylinder and a needle, and the through part of the channel perpendicular to the central axis is provided with a movable capillary flexible tube sealed in it, with one end of the pipe ki open and the other is connected to a nozzle disposed in the side hole of another channel informing | state with the internal cavity of the housing. moreover, in the middle part of the tube inside the nozzle there is a plug, at the base of which two holes are made on the side facing the needle. 2. The syringe according to claim 1, which is also distinguished by the fact that the open end of the tube is visually connected with a spring-loaded handle that gives the tube a reciprocating movement, Sources of information taken into account in the examination: 1. USSR author's certificate 384013, cl. Q-01 11/04, 1970. 2. USSR author's certificate 145311, cl. (3 01 1 11/04, 1952. yal Vj S-f Phi1 1 ) W // -