SU494608A1

SU494608A1 - Membrane Dispenser

Info

Publication number: SU494608A1
Application number: SU2019566A
Authority: SU
Inventors: Валерьян Петрович Закатов; Антонина Ивановна Кузнецова
Original assignee: Специальное Конструкторское Бюро По Автоматике В Нефтепереработке И Нефтехимии
Priority date: 1974-04-25
Filing date: 1974-04-25
Publication date: 1975-12-05

Description

ру 13 при этом подаетс дополнительное давление PZ, выход канала 7 закрыт, через проточную камеру 8 протекает газ-носитель.In this case, the pitch 13 is supplied with an additional pressure PZ, the exit of the channel 7 is closed, the carrier gas flows through the flow chamber 8.

Дл ввода отдозированной иробы в поток газа-носител подаетс давление PI и снимаетс давление р2. Клапаны 5 и 6 закрываютс , выход канала 7 в камеру 8 открываетс , отдозпрованный продукт из камеры 4 через канал / вытесн етс в камеру 8, и поток газаносител транспортирует пробу из камеры 8, например, в хроматографическую колонку. Далее давлени PY и Р принимают исходные значени , выход канала 7 закрываетс , клапаны 5 и 6 открываютс , рабоча камера дозировочной полости вновь заполн етс продуктом , и дозатор готов к очередному циклу.In order to introduce the dosed iroba into the carrier gas flow, pressure PI is applied and pressure P2 is released. The valves 5 and 6 are closed, the exit of the channel 7 into the chamber 8 is opened, the withdrawn product from the chamber 4 is channeled through the channel 8 into the chamber 8, and the gas carrier stream transports the sample from chamber 8, for example, to a chromatographic column. Then, the pressures PY and P take the initial values, the exit of the channel 7 is closed, the valves 5 and 6 open, the working chamber of the dosing cavity is refilled with product, and the dosing unit is ready for the next cycle.

Предмет изобретени Subject invention

Claims

1. Membrane dosing unit, mainly for dosing small volumes of the analyzed sample into a gas chromatograph containing a dosing cavity divided by a membrane into two chambers, one of which — the controlling one — is connected to the command gas supply line, and the other — working gas — is connected through working pneumatic valve chamber with inlet and outlet of the product to be dosed, characterized in that, in order to improve metering accuracy, it is equipped with an additional pneumatic valve, the working chamber of which is connected to the inlet and you the flow of the carrier gas and the working chamber of the dosing cavity, and the control chambers of the pneumatic valves installed at the inlet and outlet of the product to be dosed are connected to the supply line of the command gas.

2. A dispenser according to claim 1, characterized in that the working chamber of the additional valve is made in the form of a cut toroid bounded in the plane of the cut by a membrane.

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