DE151193C - - Google Patents

Description

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IMPERIAL

PATENT OFFICE.

The invention relates to a compound compressor, in which the single-acting High pressure compressor cylinder perpendicular to that of the steam piston and the low pressure compressor piston connecting piston rod is arranged and connected to her by an elliptical link such that the pressure period ■ of the high pressure compressor in the first half of the stroke of the power piston, its suction period falls in the second half of the stroke of the power piston.

In Fig. 2 of the drawing, the pistons of the steam cylinder D and the low-pressure air cylinder Ni sit on the common KoI-benstange k. As in the known force equalizers for direct-acting steam pumps, a piston Hi moves perpendicular to the piston rod k , which performs a double stroke on every single stroke of the pistons D and Ni. The novelty of the present arrangement is that the cylinder Hi is designed as a single-acting air high-pressure cylinder, so that the compression process is as follows:

While piston Ni moves from the drawn end position to the middle of the stroke, piston Hi performs its downward stroke. The air in the cylinder Hi is released through the pressure valve v _d into the wind

while the air sucked in on the left-handed hood is pre-compressed in Ni. During the second half of the stroke of Ni , piston Hi moves upwards, valve v _d closes and the air precompressed in Ni is pushed under the rising piston Hi. If Ni has reached its right end position, piston Hi is again in its highest position; the cylinder Hi is again filled with precompressed air, and the air sucked in on the left side of Ni is precompressed in Ni during the first half of the left stroke of the piston Ni, in which Hi again does its high-pressure work, and under the rising during the second half of the stroke Piston Hi pushed.

The high air pressure work is thus relocated each time to the first half of the stroke of the steam piston -D, where the greatest steam piston forces and the greater part of the steam work are available; In the second half of the stroke of D, on the other hand, piston Hi supports the movement of piston D as a result of the pressure of the precompressed air under the rising piston Hi and thus acts as a compensating piston.

The piston force diagram of the compressor is thereby modified in the manner shown by curve / (Fig. 6 of the drawing) and conforms to the vapor piston force diagram, curve d, in the desired manner.

This arrangement according to FIG. 2 is sufficient for medium degrees of compression. For higher degrees of compression, according to Fig. 1 the high-pressure steam cylinder H _{d arranged} in the same way λνίε the high-air pressure cylinder Hi . The steam expansion process takes place as follows:

When piston H _d is in its highest position and piston N _d is in the middle of the stroke, live steam passes over the

descending piston H _d . If H _{d is} in the lowest position and accordingly N _{d is} in an end position, for example the. left, arrived, the sliders S ₁ , S ₂ and S _{3 are brought} into the positions shown, and during the upward movement of H _d , the pre-stretched steam passes with further expansion, as in a Woolf's compound machine, on the left side of N _d , up to

ίο piston H _{d reaches} its highest position and piston N _{d reaches} its middle position. Then S _{1 is} reversed, H _d receives fresh high-pressure steam again, and the low-pressure steam expands in cylinder N _d alone up to the final voltage.

The high-pressure steam work is therefore performed during the second half of the stroke of the low-pressure piston; During the first half of the stroke of the latter, however, the rising piston H _d offers resistance to the movement of the piston N _d due to the tension of the steam to be pushed over to N _d.

To illustrate how it works

In Fig. 3 of the drawing, the low-pressure steam piston force is shown by curve η, and the high-pressure steam piston force, which is transmitted to the piston rod k by means of the link hs and modified according to the lever ratio , is shown by curve h. The latter is to be subtracted from η during the first half of the stroke of the low-pressure piston, because during this period H _{d has a} resistive effect, and to be added to η during the second half of the stroke. The result is the steam piston force r.

4, the curves η and h represent the piston force of the low- pressure air piston Ni and the piston force of the high-pressure piston H _d transmitted to the piston rod k . During the first half of the stroke of Ni , the piston forces h are to be added to η , during the second subtract from η in order to obtain the piston forces r to be transmitted to the compressor by k.

In Fig. 5, the resulting piston forces r of the steam engine and the compressor are shown by the curves d and c , taking into account the driving forces of the compressor at the beginning of the stroke due to the expansion of the air remaining in the harmful space and the resisting forces of the steam engine at the end of the Stroke due to vapor compression.

Claims (2)

Patent Claims: 1. Direct-acting compound compressor working with expansion of the fuel, characterized in that the high-pressure compressor cylinder (Hi ) arranged perpendicular to the main piston rod (k) performs its compression work in the first half of the stroke of the power piston (D) , while the same in the second half of the stroke through the in the first half of the hub in the low pressure cylinder (Ni) acts as a driving force. 2. Embodiment of the compound compressor according to claim 1, characterized in that in the same way as the high pressure compressor cylinder a high pressure steam cylinder is arranged so that the expansion work of the high pressure steam falls in the second half of the stroke of the low pressure piston. 1 sheet of drawings.