DE1219907B - Device for dosing liquid reagents in intermittent chemical apparatus - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

BOIj

German class: 12 g -1/01

Number: 1219 907

File number: A 40053IV a / 12 g

Filing date: April 21, 1962

Opening day: June 30, 1966

The present invention relates to a device for metering liquid reagents in an intermittent manner working chemical apparatus, especially reagents in automatic analyzers, in which the reagent is metered from a metering vessel fitted with a siphon from, which has a laterally opening feed pipe for the reagent from the storage vessel, by the intermittent flow of those to be examined flowing through a pipe Liquid is controlled, the feed pipe for the reagent from the storage vessel in which the reagent is kept at a constant level, a tube bent down and up again, the at the upper end of the dosing vessel opens into this, the flow tube for the to be examined Liquid has a constriction in front of its lower end, and in front of the flow tube above the narrowing an upward one, at the point that is above the upper one funnel-like end of the flow tube is bent over and down into the upper end of the Dosing vessel leading connecting pipe branches off, the outflow of the siphon closure of the dosing vessel and the outflow of the flow tube open separately into a common collecting vessel. This device is an addition to patent 1199 241.

The device according to the main patent works reliably and properly if the amount of flowing through liquid to be examined is so great that the overpressure in the connecting pipe so long maintained between the dosing vessel and the flow tube for the liquid to be examined remains until the dosing vessel has emptied into the collecting vessel. That will always be the Be the case when the amount of liquid to be examined is so large that its flow through the narrowed point in the flow tube lasts until the dosing vessel has emptied completely. It is So for the proper operation of the device nach.dem main patent necessary that the to be examined The amount of liquid is greater than the reagent liquid or not in a certain amount the relationship to her that is to be fallen short of.

However, difficulties arise when metering larger amounts of reagent liquid or with small amounts of liquid to be examined. If the liquid to be examined has passed through its flow tube before the dosing vessel has been able to empty, a renewed inflow of dosing liquid occurs from the storage vessel device for dosing liquids
Reagents in intermittent working
chemical apparatus

Addendum to the patent: 1199 241

Applicant:

Arnost Anscherlik, Prague

Representative:

Dipl.-Phys. Dr. W. Junius, patent attorney,

Hanover, Abbestr. 20th

Named as inventor:

Arnost Anscherlik, Prague '■' -. ■,

Claimed priority:

Czechoslovakia April 24, 1961 (2509)

into the dosing vessel, whereby the amount of reagent liquid added is indeterminate.

The present invention avoids this disadvantage and provides an addition to the device of the main patent a device for dosing liquid reagents, in which the quantitative ratio between the liquid to be examined and the reagent liquid, no influence whatsoever on the dosage the reagent liquid may have. \

The invention consists in that a container is connected between the storage vessel and the dosing vessel is, the upper end of which is on the one hand just below the level line of the storage vessel running pipe with the upper end of the dispensing vessel and on the other hand connected to a 'constricted supply line with the lower part of the storage vessel and finally free at the top is vented and the lower end of which is closed by a siphon, the apex of which is above the Levels of the storage vessel is.

In this device, an amount of liquid to be examined runs in operation with each flow through the flow tube both from the dosing vessel and from the container connected between the storage vessel and the dosing vessel Reagent liquid. Only the reagent liquid

609 587/431

The speed from the dosing vessel is used for the analysis. The reagent liquid from the intermediate The container is not used and can, for example, be returned to the storage container after it has leaked be pumped back. It is useful if the volume uses this as a delay vessel working container is so large that it takes considerably less time to fill it than to empty it of the dosing tube. '■ ·

It is useful if the connecting tube between the delay vessel and the metering tube is curved downwards in a U-shape in the middle part.

The drawing shows an embodiment of the present invention. The right part of the drawing represents the device according to patent 1199 241. ''

The drawing has a metering tube 1 which is bent in the form of a letter S lying in a vertical plane. One outer leg of the S-shaped bent tube 1, the mouth of which is directed downwards, ends above a collecting vessel 5. The other outer leg contains a bubble-shaped enlargement. Above the same is a tube 6 in the form of an inverted U, which leads to a vertical tube 4 to which it is connected laterally, approximately in the middle of the metering tube 1. The upper end of the tube 4 is slightly below the apex of the Connection pipe 6 and is provided with a funnel-shaped extension. Below the connection point of the U-shaped connecting pipe 6, a constriction 4 'is provided in the flow pipe 4.

The S-shaped bent metering tube 1 is assigned an almost identical S-shaped bent tube 8 almost symmetrically to a vertical plane. One of its outer legs, which is directed downwards with the mouth, opens out above a collecting vessel 9, to which a waste line can be connected under certain circumstances. The other outer leg of the S-shaped tube 8 also has a bubble-shaped enlargement, above which this leg of the S-shaped tube 8 opens into the open. In the upper part of the bubble-shaped enlargement opens a pipe 7 which extends from the lowest point of a container 3 for receiving the liquid to be dosed. Above the bubble-shaped enlargement, the S-shaped bent tube 8 is connected to the metering device 1 by a tube 2. The storage vessel 3, in which the liquid level is always kept at the same height, is arranged with respect to the two S-shaped tubes 1 and 8 that the above curvatures B and C of the two S-shaped tubes are slightly above the Liquid level are located in the reservoir 3 and that the two ends' and A " of the pipe 2 connecting the two S-shaped tubes 1 and 8, which are at the same height, are below the liquid level in the container 3. If the reservoir 3 is up to the specified level with the The two S-shaped tubes 1 and 8, of which the first metering tube and the second delay vessel should be named for the sake of simplicity, are filled with the reagent, but the upward curvatures B ₁ C of the two S- shaped bent tubes 1 and 8 are above the filling.

The cross section of the inlet pipe 7 from the reservoir 3 into the delay vessel 8 is chosen so large that in. During the same period of time from the vessel 3 into the delay vessel A, not as much liquid can flow in as when the liquid trapped in the delay vessel 8 is pushed up. The amount of liquid can flow out via the "upper curve V. Furthermore, the volume of the delay vessel 8 is dimensioned so large that it can be filled

ίο Much more time is required than is required to empty the metering tube 1 after its contents have been pushed up over the upper curve B.

When the liquid to be examined is poured into the inlet of the pipe 4 in order to carry out an analysis, it also penetrates into the connecting pipe 6 because of the narrowed point 4 ′. As a result of the increase in air pressure in the tube 6, the amount of reagent in the metering tube 1 receives an impulse through which the reagent is guided over the bend B and runs into the collecting vessel 5. The liquid in the connecting pipe 2 is also pushed back to the delay vessel 8 by the pressure pulse. Since the inlet pipe 7 from the reservoir 3 to the delay vessel 8 has a small cross-section, almost no displaced liquid can penetrate into the vessel 3. The intrusion can even be prevented by providing a check valve. By pushing in the liquid from the connecting pipe 2

'In the delay vessel 8, therefore, the mirror at the point in this rises νί' and in the curvature C. Thus, the liquid from the delay vessel 8 flows into the receptacle 9. This decreases very quickly, the liquid below the connection point A 'of the connecting pipe. 2 A subsequent flow of reagent from the storage container 3 via the connecting tube 2 into the metering tube 1 is thus immediately made impossible.

The flow tube 4 is always fed only a certain amount of the liquid to be examined. Once this has passed through the pipe 4, the delay vessel 8 is refilled from the storage container 3 and then the metering pipe 3 via the connecting pipe 2 and the water level in the delay vessel 8 has reached the mouth A 'of the connecting pipe 2. In this way, the initial state is restored. With each new supply of liquid to the flow tube 4, the processes are repeated.

Claims (3)

Patent claims: 1. Device for dosing liquid reagents in intermittent chemical Apparatus, in particular of reagents in automatic analyzers, in which the Dosing of the reagent from a dosing vessel equipped with a siphon closure, which has a laterally opening feed pipe for the reagent from the storage vessel through the intermittent flow of the liquid under investigation flowing through a pipe is controlled, the feed pipe for the reagent from the storage vessel in which the Reagent is held at a constant level, bent downwards and upwards again The tube that opens into the metering vessel at the upper end thereof is the flow tube for the liquid to be examined has a constriction in front of its lower end, and wherein from the flow tube above the constriction an upward running one at the point which lies above the upper funnel-like end of the flow tube, bent over and after The connecting pipe branches off down into the upper end of the dosing vessel, the Outflow of the siphon cap of the dosing vessel as well as the outflow of the flow tube open separately into a common collecting vessel according to patent 1199 241, characterized in that that between the storage vessel (3) and the dosing vessel (1) a container (8) is switched on, the upper end of which on the one hand via a pipe (2) running just below the level line of the storage vessel (3) the upper end of the dosing vessel (1) and, on the other hand, a feed that is narrowed in comparison connected to the lower part of the storage vessel (3) and finally free to the top is vented and the lower end of which is closed by a siphon, the top of which (C) is above the level of the storage vessel (3). 2. Apparatus according to claim 1, characterized in that the volume of the delay vessel (8) is so large that it is filled considerably more time is required than for emptying the metering tube (1). 3. Apparatus according to claim 1, characterized in that the connecting tube (2) between after the delay vessel (8) and the metering tube (1) in the middle part in a U-shape is curved at the bottom. Considered publications:
Belgian patent specification No. 554 660. 1 sheet of drawings 609 587/431 6. 66 © Bundesdruckerei Berlin