Importance

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Abstract

The invention is related to a pump, preferably a positive-displacement pump, comprising: a) a rotary drive member (1) driven at a speed dependent on a speed of a driving motor; b) a casing (3); c) and a first feed wheel (5) arranged in said casing (3), said first feed wheel (5) being coupled to said rotary drive member (1) for introducing a torque; d) said first feed wheel (5) forming, with the walls of said casing alone or in conjunction with a second feed wheel (6), a delivery space (7) comprising a low-pressure side (8) connected to a pump inlet port and a high-pressure side (9) connected to a pump outlet port; wherein: e) limiting delivery of said pump is achieved by using a magnetic clutch (11-17) which couples said rotary drive member (1) to said first feed wheel (5) for transmitting said torque; f) an input half (11-14) of said magnetic clutch (11-17) is non-rotatably connected to said rotary drive member (1), and an output half (15-17) of said magnetic clutch (11-17) is non-rotatably connected to said first feed wheel (5); g) and said magnetic clutch (11-17) is designed with regard to a limiting torque, such that when said output half (15-17) reaches a speed predefined by the design, it no longer increases, or at least increases more slowly than the speed of said input half (11-14) when said input half (11-14) exceeds said predefined speed, wherein said predefined speed is less than a maximum operating speed of said input half (11-14).

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First Claim