US1933123A - Primer for engine driven rotary pumps - Google Patents

Description

Oct. 31, 1933. F. SCHREINER 1,933,123

PRIIER FOR ENGINE DRIVEN ROTARY PUIPS Filed June 6, 1931 Patented Oct. 31,- 1933 UNITED STATES PATENT OFFICE.

Schreiner, Salzburg Austria Application June 6,1931, Serial No. 542,577, and

in Austria June 13, 1930 2 Claims.

This invention relates to a device for the withdrawal or exhaustion of the air from the suction side of rotary pumps driven by internal-combustion engines, such as, for example, the pumps on motor fire-engines. This result is achieved, in accordance with the invention, by providing one or more of the cylinders of the internal-combustion engine with switching means which enable these cylinders to operate, when required, as compressors. These cylinders are driven by the remaining cylinders of the internal-combustion engine, and are thereby caused to draw in and to compress either the normal mixture of gas and air or air alone. This compressed mixture or air is then used to work an ejector the suction tube of which is connected to the suction side of the pump, so that the latter can thus be exhausted.

One example of a form of construction for this device is illustrated in the accompanying drawing, in which:--

Fig. 1 shows the said device in elevation and in part section.

Fig. 2 shows the switching device proper shown in section in Fig. 1, in vertical section taken at right angles to the sectional portion of Fig. 1.

The rotary pump 1, which can be of any desired construction, is directly driven by the internal combustion engine 2. This latter comprises in the present instance, for the sake of simplicity, two cylinders only, but could equally well have any desired number of cylinders. This engine may also be either a four-stroke or a two-stroke engine.

The right-hand cylinder in the drawing, denoted by the reference character 3, is taken as the cylinder which is to beadapted to be employed as a compressor. To this end a channel or port 4 is branched from the upper end'of the cylinder, and leads to a rotary slide-valve 5 which is seated so as to be rotatable in the bore of a casing 6. The slide-valve 5 is conically formed, in the manner of the plug of a cook or tap, and is kept tightly fitted in its seating in the casing 6 by means of a spring '7. This valve member 5 is provided with a transverse channel 8 which, in a certain position of the valve member 5, connects the channel 4 with a channel 9 leading to a chamber 10 which is connected with the inflow side of the ejector 11 (Fig. 2). The ejector 11 consists of the two nozzles 12 and 13, and to the suction gap located between these two nozzles, denoted by 14, there is connected a channel 15 which merges in a recess 16 in the valve member 5. At a certain position of valve, this recess 16 opens communication be-' tween the channel 15 and the channel 1'7 in the casing 6; and this channel 1'? is connected by means of the pipe 18 with the suction side of the rotary pump 1.

In the exhaust-pipe connection 19 of the cylinder 3 there is arranged a throttle-plate 20 by means of which this connection can be closed. To the axle of this plate there is keyed an arm 21 which is articulated by means of a rod 22 to an arm 23 of the rotary slide-valve 5. If the rotary slide-valve be brought into the position in which it is shown in Fig. 1, in which position the interior of the cylinder is connected with the ejector 11 through the channels 4, 8, and 9, and the chamber 10, and in which, further, the suction gap 14 of the ejectoris connected with the suction side of the pump 1 through the channel 15, the recess .16 in the slide valve, and the pipe 18, then the system of rods 23, 22, and 21 causes the throttle plate 20 in the exhaust-pipe connection 19 to be closed. If the valve member 5 be then turned through 90, whereby the abovedescribed connections are interrupted, the throttle-plate 20 is brought into the open position by the described means.

To the casing 6 of the rotary valve there is attached an electric contact 24 over which there is adapted to be moved a sliding contact 25 which is rigidly connected to the valve member 5. when the valve member 5 is in the position in which it is shown in Fig. 2, the sliding contact 25 touches the fixed con act 24, whereby v the current to the sparking plug (not shown in the drawing) of cylinder 3 is short-circuited.

In the chamber 10 there is fitted a non-retum valve 26 which is under the action of a spring 27, and which closes oil? the channel 9 from the chamber 10 until this valve is opened by excess pressure in the channel 9.

If the valve member 5 be in the position in which it is shown in' Fig. 1, and the left-hand cylinder of the internal combustion engine 2 be allowed to work in the normal manner, the right-hand cylinder 3 acts as a compressor. Through the sliding contact 25 the current the sparking plug is short-circuited, so that the ignition does not function in this cylinder. The exhaust-pipe connection 19 is closed-off by the throttle plate 20. The piston of cylinder 3 (not shown) on its down-stroke draws in through the inlet valve of the cylinder (not shown) either in the normal manner a mixture of gas and air, or, it the supply of gas be likewise closed-off, only air alone. On the up-stroke of the piston 110 the mixture or air is compressed and driven along the course indicated by 4, 8, 9, 10, ll, 12, and 13. At the same time there is generated in the gap 14 between the two nozzles 12 and 13 a suction action which is communicated through 15, 16, 17, and 18 to the suction side of the pump 1, and there causes the air to be exhausted until the vacuum obtained is sufficient to bring the water up the suction pipe and to Within reach of the rotor or vane wheel of the rotary pump. As soon as this result is achieved, the valve member 5 is turned through 90, whereby the described passages are closed. At the same time the current circuit to the sparking plug is closed, and the exhaust-pipe connection 19 opened. If the gas supply to the cylinder 3 was also closed, this supply is now also reopened, so that the cylinder 3 which,.as long as the same acted as a compressor, was driven by cylinder 2 alone, can now participate in the driving of the pump 1.

The chamber 28 of the ejector serves as a compression chamber for the purpose of equalizing the pressure impulses coming from the cylinder 3. It is, however, advisable further to make the entry edge 29 of the nozzle 12 as sharp as possible, in order to increase the kinetic energy of the intermittent supply of compressed air or mixture in the ejector.

It will be clear that with an internal combustion engine having a larger number of cylinders more than one cylinder can be thus caused to act as a compressor, while the remaining cylinders drive both the compressing cylinders and the pump during the exhausting process.

In place of an ejector it is also possible to employ other suction devices adapted to be operated by compressed air as a driving medium.

A device similar to that above described could also'be employed for the exhausting of other than rotary pumps.

With the employment of an ejector as described it is possible with the device in accordance with the present invention to raise the water 9.5 metres high in the suction pipe of the pump, so that the pump can be placed at this height above the level of the water to be pumped. On the other hand, with the employment, as already proposed, of one or more of the cylinders of an internal combustion engine as an air pump driven by the remaining cylinders, a suction height of at the most 4.5 metres could be ob tained, since the clearance of the piston in the cylinder of internal-combustion engines is so large that a higher suction output cannot be obtained.

I claim:

1. A device for the exhausting of pumps driven by multi-cylinder internal combustion engines comprising in association with at least one of the cylinders of the said engine means for closing the exhaust pipe and cutting-out the ignition of the said cylinder, for the purpose of enabling the said cylinder to be employed as a compressor, a suction device connected to the suction side of the said pump and adapted to be operated by a gaseous medium compressed by the said cylinder, and means for connecting the said suction device to the said cylinder.

2. A device as claimed in claim 1 in which the said suction device is an ejector.

FRANZ SCHREINER.

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