DE1244428B - Device for admixing an admixing liquid to a main liquid flow in a fixed mixing ratio - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

GOIf

German KL; 42 e-23/35

Number: 1244428

File number: M 45117IX b / 42 e

Filing date: April 26, 1960

Opened on: July 13, 1967

The invention relates to a device for adding an admixing liquid to a main liquid flow in a fixed mixing ratio, especially for adding a foaming agent for fire extinguishing purposes to the process water flow, using one in the main liquid flow generated differential pressure, which at one containing a throttle point and a mixing valve controlling shunt is located.

Devices of this type find relatively common use when it comes to with to supply admixing liquid to a main liquid flow with little effort and thereby a solid one Maintain mixing ratio. A number of these devices has the disadvantage that when Cessation of flow in the main liquid flow pipeline connects to the the Admixing liquid containing container remains, through the admixing liquid in this main pipe can reach, so that when the flow resumes in the main pipeline initially a mixture of too high a concentration is released will. This disadvantage is in a known arrangement for automatic locking or releasing the addition of measured quantities of liquids or gases by means of a in the delivery line for the liquid to be treated · existing or artificially generated pressure difference avoided. However, this arrangement has no way of regulating the amount to be added Amount of liquid as a function of the delivery rate in the main delivery line, so that also not the proportioning ratio is kept constant over a larger range of variable operating conditions can be. The arrangement is suitable for cases where the one assigned to the main conveyor line Pump has essentially constant delivery rate and thus no variable operating conditions occur. When crossing a specific differential pressure value at an orifice located in the main delivery line opens an in a bypass line membrane has a flow opening through which the admixture flow is completely released, the size of which is otherwise by a in this bypass line horizontal manual control valve is adjustable. When the differential pressure falls below a lower limit value closes the membrane so that admixing agents can no longer enter the main delivery line.

The aim of the invention is to create a device of the type mentioned at the outset, in which a set specific admixing ratio in all devices for admixing a
Admixing liquid to one
Main liquid flow in a fixed
Mixing ratio

Applicant;

MINIMAX Aktiengesellschaft,

Stuttgart-Zuffenhausen, Schtitzenbühlstr. 12th

Named as inventor:

Martin Betzier, Urach (Württ.)

Operating conditions, d. H. at all permissible flow rates of main flow liquid through the associated main pipeline, remains the same, with a tight tolerance of the setting Mixing ratio is guaranteed.

The device according to the invention is characterized in that the shunt line in on known way contains a second variable throttle point and with the one of the two Throttle points pending part of the differential pressure the movable wall of a differential pressure receiver is acted upon, a flow control valve for the via an associated actuator Admixing liquid regulates.

In the subsequent protection request for the subclaims only in connection with the Claim 1 protection sought.

In the drawing, an embodiment of the subject matter of the invention is shown:

The figure shows the device according to the invention in a schematic representation.

A Venturi tube 1 generates an effective pressure as a function of the flow of process water, which is tapped via the effective pressure lines 2 and 3. Through a connecting line 4 of these two differential pressure lines 2, 3, in which two throttle points 5 and 6 are arranged, the effective pressure is fully or partially delivered to a line 7, which branches off between the throttle points 5 and 6 and leads to a differential pressure receiver 8. The throttle point 5 is variable; it allows the desired degree of division of the differential pressure to be set continuously. This acts on the movable wall 9 of the differential pressure receiver 8 via the lines 2 and 7 and adjusts it against the spring force of the spring 10 to be overcome.

709 610/220

Claims (5)

The movable wall 9 is connected via a piston rod U to the control element 12 of a foam compound valve, which is adjusted by the latter in accordance with the respectively set partial or full effective pressure. Depending on the position of the valve 12, a certain amount of the foaming agent that flows in from the storage container 15 reaches the suction area of a jet pump 13, which is operated with the pressure gradient of a water pump 14. The foaming agent is conveyed from the motive water of the jet pump 13 into the suction line of the pump 14. If the pump 14 does not convey any water into the consumption line 16, then there is no effective pressure in the Venturi tube 1 either. The differential pressure receiver 8 thus remains unaffected and the control valve 12 is therefore closed. In this case, the jet pump 13 is not supplied with foam concentrate. The effective pressure in the Venturi tube 1, which controls the addition of the foaming agent via the control valve 12, changes depending on the amount of consumption water flowing through or the foam concentrate solution. The variable throttle point 5 makes it possible, by dividing the effective pressure, to set a certain admixing ratio. H. remains the same for all permissible flow rates of foam concentrate solution through the consumption line 16. Patent claims: 1. Device for adding an admixing liquid to a main liquid flow in a fixed mixing ratio, especially for adding a foam concentrate for fire extinguishing purposes to the process water flow, using a differential pressure generated in the main liquid flow, which at a one Throttle containing and a mixing valve controlling shunt line, characterized in that the shunt line (2,3) contains a second variable throttle point (5) in a manner known per se and the movable wall (9 ) with the part of the differential pressure at one of the two throttle points (5, 6) ) a differential pressure receiver (8) is acted upon, which regulates a flow control valve (12) for the admixing liquid via an associated actuating element (11). 2. Apparatus according to claim 1, characterized in that the differential pressure in on known way through a venturi tube (1) inserted into the main liquid flow is generated. 3. Apparatus according to claim 1 or 2, characterized in that the admixing liquid in a manner known per se from a liquid pump into the main liquid flow is promoted and the flow control valve (12) controlled by the differential pressure receiver (8) den keeps the percentage of the admixing liquid in the main liquid flow constant 4. Apparatus according to claim 3, characterized in that the liquid pump is a in a manner known per se with the pressure gradient of one inserted into the main liquid flow Pressure pump (14) operated jet pump (13) is. 5. Device according to one of the preceding claims, characterized in that the movable wall (9) of the differential pressure receiver (8) is spring-loaded. Considered publications:
German patent specification No. 392135,427 851,
704.891753.968 896. 1 sheet of drawings