DE1148141B - Fire brigade syringes, in particular portable pumps - Google Patents

Description

The invention relates to a fire brigade syringe, in particular a portable pump, with a centrifugal pump, those of two arranged in a common housing and on a common impeller shaft Pump sets consists of one of the pressure side of the first pump set to the suction side of the second pump set leading diversion are connected to each other and optionally parallel or can be connected in series, with each pump set having its own suction nozzle and a has its own pressure port and both the suction port and the pressure port of the pump sets a separate suction or pressure line is connected in each case. Such fire brigade syringes are very advantageous in that they use extinguishing water when pump sets are connected in series supply relatively high pressure, but double that when the pump sets are connected in parallel Pump the amount of water at half the pressure and are therefore also well suited for bilge pumping.

With known fire brigade syringes of this type, it is necessary to connect the pump sets in series, not only the suction port of the second pump set, for example by putting on a closure flap to close and to operate a switching valve, but also the pressure port of the first pump set to close. As a result, however, the operation of the fire brigade sprayer is proportionate laborious.

The invention aims to avoid this disadvantage, and is that the pressure port of the first pump set is arranged on the diversion connecting the pump sets to one another and that the diversion has a two-seat valve, which either the connection to the second pump set or blocks the pressure port of the first pump set. This ensures that for Connecting the pump sets in series only the two-seat valve arranged in the bypass switched and the suction port of the second pump set needs to be closed, a separate one Closing the pressure port of the first pump set, however, is no longer necessary because the The pressure port is automatically closed at the same time as the two-seat valve is switched over.

In a particularly advantageous embodiment of the invention, the suction port of the first pump set are arranged coaxially to the impeller shaft and the suction port of the second pump set perpendicular to the impeller shaft on the pump housing, the impeller shaft being driven from the side of the second pump set. This results in a fire brigade syringe,
in particular portable pumps

Applicant:

Konrad Rosenbauer,

Fire fighting equipment and syringe factory,

Linz / Danube (Austria)

Representative: Dr. E. Wetzel, patent attorney,
Nuremberg, Hefnersplatz 3

Dipl.-Ing. Konrad Rosenbauer,

Linz / Danube (Austria),
has been named as the inventor

Particularly simple structure of the centrifugal pump as well as the possibility of the centrifugal pump extremely space-saving to accommodate on a transport vehicle. In the drawing is an exemplary embodiment Centrifugal pump of a fire brigade syringe according to the invention shown schematically.

The centrifugal pump of the fire brigade syringe consists of two pump sets 3, 4 arranged in a common housing 1, the running wheels 3 α, 4 a of which are mounted on a common impeller shaft 2. The pump sets 3, 4 are connected to one another by a diversion 9 leading from the pressure side of the first pump set 3 to the suction side of the second pump set 4. Each of the two pump sets 3 , 4 has its own suction port 5 or 6 with a hose connection coupling 5 α or 6 a and its own pressure port 7 or 8, the pressure port 7 of the first pump set 3 at which the pump sets 3, 4 connect with each other Diversion 9 is arranged. In the bypass 9, a two-seat valve 10 is arranged, which is shown in FIG

Position applied to a valve seat 11 and the connection to the second pump set 4 blocks, in its other position, however, it blocks against a valve seat 12 applies and the pressure port 7 of the first pump set 3 blocks.

In the illustrated position of the double-seat valve 10, in which the diversion 9 to the second Pump set 4 is blocked and the pressure port 7

309 578/36

is connected to the pressure chamber of the first pump set 3, the centrifugal pump is used for bilge. In this position, both pump sets 3, 4 act like two separate single-stage centrifugal pumps, which suck in a relatively large amount of water via both suction nozzles 5, 6 and this amount of water enters the pressure lines connected to the pressure nozzles 7, 8 of the pump sets 3, 4 at relatively low pressure support financially. If the centrifugal pump is to be used as a fire pump, the valve 10 is moved to its other position, in which it rests against the valve seat 12 and closes the pressure port 7 of the first pump set 3, but releases the bypass 9 to the second pump set 4. In addition, the suction port 6 of the second pump set 4 is closed, for example by means of a closure flap. As a result, the pump sets 3, 4 are connected in series in a simple manner and thus act like a double-stage centrifugal pump, in which only half the amount of water is sucked in via the suction connection 5 of the first pump set 3 in relation to bilge operation, but this amount of water is drawn in at double the pressure via the pressure connection 8 of the second pump set 5 is conveyed into the extinguishing line.

Claims (2)

PATENT CLAIMS: 1. Fire service sprayer, in particular portable pump, with a centrifugal pump, which consists of two pump sets arranged in a common housing and on a common impeller shaft, which are connected to one another by a diversion leading from the pressure side of the first pump set to the suction side of the second pump set and optionally in parallel or can be connected in series, each pump set has its own suction nozzle and its own pressure nozzle and a separate suction or pressure line is connected to both the suction nozzle and the pressure nozzle of the pump sets, characterized in that the pressure nozzle (7) of the first pump set (3) is arranged on the bypass (9) connecting the pump sets (3, 4) and that the bypass has a two-seat valve (10) which either connects to the second pump set (4) or the pressure port (7) of the first The pump set (3) locks. 2. Fire brigade syringe according to claim 1, characterized in that the suction nozzle (S) of the first pump set (3) coaxial to the impeller shaft (2) and the suction nozzle (6) of the second pump set (4) are arranged perpendicular to the impeller shaft (2) on the pump housing (1), the Impeller shaft (2) is driven from the side of the second pump set (4). Considered publications:
British Patent No. 347,643;
U.S. Patent No. 1,628,841. 1 sheet of drawings © 309 578/36 4.