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Positive displacement pump for transporting a fluid with automatic adaptation to the compressibility of the fluid

Positive displacement pump for transporting a fluid with automatic adaptation to the compressibility of the fluid description/claims

The invention relates to a positive displacement pump.

Positive displacement pumps for transporting a fluid have been known for a long time. The dimensions and operating properties of such pumps are usually adapted to a particular type of fluid. They may in particular be adapted to the transport of a compressible fluid, such as a gas, or to the transport of an incompressible fluid, such as a liquid. A change in the composition, and thus the compressibility, of the fluid to be transported may, on the one hand, result in an unwanted reduction of the flow rate and, on the other hand, in an increased stress on the pump, in the worst case the pump may even be damaged.

Thus it is the object of the invention to create a positive displacement pump whose mechanical properties, such as the suction capacity of the pump, automatically adapt to the compressibility of that fluid.

This object is attained by the features of claim 1. The goal of the invention is to create a positive displacement pump in which a suction or displacement element, respectively, comprising a diaphragm is connected to a drive device in an elastically sprung manner. Depending on the compressibility of the fluid to be transported, this spring element is more or less stressed during each pumping cycle. This leads to an increased suction capacity at a constant flow rate of the fluid while the stress, in particular on the moving parts of the pump, is reduced.

Further advantageous embodiments of the invention are stated in the sub-claims.

Further features and details of the invention will become apparent from the ensuing description of several embodiments, taken in conjunction with the drawings, in which

FIG. 1 shows an exploded view of a positive displacement pump according to a first embodiment;

FIG. 2 shows a central longitudinal section of the positive displacement pump according to FIG. 1 with the spring element unstressed, such as during the transport of a compressible fluid at the beginning of a suction-discharge cycle;

FIG. 3 shows a central longitudinal section of the positive displacement pump according to FIG. 1 differing by a quarter cycle from the position shown in FIG. 2;

FIG. 4 shows a central longitudinal section of the positive displacement pump according to FIG. 1 differing by a half cycle from the position shown in FIG. 2;

FIG. 5 shows a central longitudinal section of the positive displacement pump according to FIG. 1 differing by a three-quarter cycle from the position shown in FIG. 2;

FIG. 6 shows a central longitudinal section of the positive displacement pump according to FIG. 1 corresponding to the position shown in FIG. 2 but with the spring element stressed, such as during the transport of an incompressible fluid;

FIG. 7 shows a central longitudinal section of the positive displacement pump according to FIG. 1 corresponding to the position shown in FIG. 5 but with the spring element stressed, such as during the transport of an incompressible fluid;

FIG. 8 to FIG. 14 show a positive displacement pump according to a second embodiment corresponding to FIGS. 1 to 7;

FIG. 15 to FIG. 21 show a positive displacement pump according to a third embodiment corresponding to FIGS. 1 to 7; and

FIG. 22 and FIG. 23 show a positive displacement pump according to a fourth embodiment.

The following is a description of a first embodiment, taken in conjunction with FIGS. 1 to 7.

• Provisional Patent
• Utility Patent

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