DE1079957B - Device for introducing an additive into a pressurized fluid line, in particular for fire extinguishing purposes - Google Patents

Description

GERMAN

The invention relates to a device for introducing an additive into a hydraulic fluid line, especially for fire extinguishing purposes in which the hydraulic fluid line goes from bottom to top through the additive container and in the lower part of the container into the hydraulic fluid line a Venturi tube is switched on, which has access openings for the through at its narrowest point a partial flow of the hydraulic fluid has pressurized additives.

In known devices of this type, which are used in the production of physical foam for fire extinguishing purposes for introducing a foam or wetting agent are used in the pressurized water flow, the partial flow upstream of the Venturi tube is from the hydraulic fluid line branched off. The partial flow line must also be parallel to the hydraulic fluid line from bottom to top into the additive container to above the liquid level of the Additive are performed. The structure of the known devices is therefore proportionate laborious.

The invention aims to avoid this disadvantage of the known devices, and exists in that the partial flow, seen in the direction of flow, behind the venturi in the upper part or is branched off from the hydraulic fluid line directly above the additive tank. Through this it is achieved that either no partial flow line at all or only a relatively large one short partial flow line is required.

If the partial flow is branched off directly above the additive container, it can through a in the short partial flow line arranged throttle member can be regulated. This arrangement has the advantage with it that the access openings for the additive at the narrowest point of the Venturi tube can have relatively large diameter, so that differences in the viscosity of the additive be compensated by regulating the pressure in the additive container by means of the throttle element can.

In a particularly expedient embodiment of the invention, the recirculation takes place Hydraulic fluid line behind the narrowest point of the Venturi tube to its original cross-section in two sections, of which the first immediately behind the narrowest point and the second immediately in front of the branch "of the partial flow. This has the advantage that the amount of additive, which is in the standby state of the device in the guided through the additive container Part of the hydraulic fluid line is located and ejected when the device is started up

contraption
for introducing an additive

in a hydraulic fluid line,
especially for fire extinguishing purposes

Applicant:

Minimax Aktiengesellschaft,
Stuttgart, Reinsburgstr. 198

Martin Betzier, Urach (Württ),
has been named as the inventor

becomes proportionate without being effective for the extinguishing action is low.

An exemplary embodiment of the invention is shown schematically in the drawing.

In the container 1 is the additive, which in a certain amount in the pressurized water line 2 is to be introduced. The pressurized water line 2 is from the bottom up through the Additive container 1 and can by a before entering the additive container 1 arranged valve 3 are shut off. In the lower part of the additive container is in the Pressurized water line 2, a Venturi tube 4 is switched on, which has access openings 5 at its narrowest point for the additive. Immediately above the additive container 1 is from the pressurized water line 2 branches off a partial flow line 10 which opens into the additive container 1 from above and is provided with a throttle element 11 to regulate the partial flow. The partial flow can also before Exit of the pressurized water line 2 from the additive tank 1 in the upper part of the additive tank be branched off from the pressure water line 2. In this case, however, there is a regulation of the partial flow not possible.

The return of the pressurized water line 2 behind the narrowest point of the Venturi tube 4 on their original cross section takes place in two sections 6 and 8, the first of which is immediately behind the narrowest point of the venturi 4 and the second

909 770/52

is immediately in front of the branch of the partial flow. The valve 12 is used to drain the water complete emptying of the additive container 1 and the closure 13 for filling in the additive. The mode of operation of the device is as follows: When the device is started up, the valve 3 opened, whereupon pressurized water flows through the device. At the narrowest point of the venturi 4 there is a pressure loss, which is behind the narrowest point when the Druckfiüssigkeitsleitung 2 to its original cross-section in sections 6 and 8 almost completely is recovered. Part of the pressurized water flows under this pressure through the partial flow line 10 into the additive container 1. Due to the pressure difference between the pressure of the in the additive container 1 flowing in pressurized water and at the narrowest point of the Venturi tube prevailing pressure, the additive located in the additive container 1 is displaced and a ° through the inlet openings 5 arranged at the narrowest point of the venturi tube 4 into the pressurized water line 2 introduced, specifically in an amount that corresponds to the cross section of the partial flow line 10 the amount of pressurized water flowing in and to achieve the desired mixing ratio is required. By changing the cross-section of the partial flow line 10 with the aid of the control element 11 the mixing ratio can be changed or there can be differences in the viscosity of the additive be balanced.

According to the laws about the Venturi pressure and about the flow of liquids through The admixing process always runs in holes, even with changing pressures and withdrawal quantities Dependence on the drainage water pipe 2 amount of pressurized water flowing through. It can thus provide different services to the consumer Admixing device can be connected.

Claims (3)

PATENT CLAIMS: 1. Device for introducing an additive into a hydraulic fluid line, in particular for fire extinguishing purposes in which the hydraulic fluid line runs from bottom to top through the Additive container passed through and in the lower part of the container in the hydraulic fluid line a venturi is switched on, which at its narrowest point has access openings for the has additives pressurized by a partial flow of the hydraulic fluid, characterized in that that the Teilstrpm, seen in the direction of flow, behind the Venturi tube (4) in the upper part or directly above the additive container (1) is branched off from the hydraulic fluid line (2). 2. Apparatus according to claim 1, wherein the partial flow is immediately above the additive container (1) is branched off, characterized in that the partial flow through a in the partial flow line (10) arranged throttle member (11) is adjustable. 3. Apparatus according to claim 1 or 2, characterized in that the return of the hydraulic fluid line (2) takes place behind the narrowest point of the venturi tube (4) on its original cross-section in two sections (6,8), from those of the first immediately behind the narrowest point and the second immediately in front of the branch of the partial flow. Considered publications:
French Patent No. 826 841;
British Patent Nos. 438 416, 513 147. 1 sheet of drawings © 909 770/52 Ψ.60