Method for reducing noise and cavitation in machines and pressure exchangers which pressurize or depressurize fluids by means of displacement principle

Abstract

A method for reducing noise and cavitation in machines and pressure exchangers which pressurize or depressurize fluids by means of the displacement principle, wherein at least one of the pressure exchanger's end covers is equipped with connecting channels (14, 17, 18) which substantially increase the inlet and outlet of flow medium in the rotor channels (15, 16) during residence in the depressurization zone (3) or the pressurization zone (4). The method comprises different embodiments such as, for example, a direct channel connection (14) between channel (16) and opposite channel (15).

Description

technical field

[0001] The invention relates to a method for reducing noise and cavitation in devices operating on the principle of displacement. When the principle of displacement is used to pressurize a limited volume of liquid extremely quickly, noise will be accompanied by it, or when decompression is extremely fast, noise will also be generated, but the noise is greatly enhanced due to cavitation, and cavitation can also damage the structure and shorten the life of the equipment. Background technique

[0002] Many devices are known at present, which include hydraulic pumps, hydraulic valves, hydraulic actuators, hydraulic motors and pressure exchangers described in Norwegian Patent Nos. Noise levels become unacceptable when used at higher rotational frequencies or under pressure. In practice, the last-mentioned type of equipment is particularly subject to these operating conditions, since the time in which both processes are to be carried out simultaneously within the...

Examples

Embodiment Construction

[0013] figure 1 All major components of a symmetrical end cap with high pressure port 1 and low pressure port 2 are shown. Although the aperture angles are the same in the figures, this is not necessary and may be advantageous in combination with a different number of channels in the rotor. There are two sealing areas on the end cover, one is the decompression area 3 between the high pressure side and the low pressure side, and the other is the pressurized area 4. According to the fact that the rotor channels rotate clockwise, all the rotor channels will pass from the high pressure port 1 through the decompression zone 3 to the low pressure port 2, so as to pass through the pressurized zone 4 and enter the high pressure port 1 again. Furthermore, the decompression zone 3 has an inlet edge and an outlet edge 6 , and the pressurization zone 4 has an inlet edge 7 and an outlet edge 8 , respectively. The angular extent of the sealing areas 3 and 4 covers at least one complete ro...

technical field

[0001] The invention relates to a method for reducing noise and cavitation in devices operating on the principle of displacement. When the principle of displacement is used to pressurize a limited volume of liquid extremely quickly, noise will be accompanied by it, or when decompression is extremely fast, noise will also be generated, but the noise is greatly enhanced due to cavitation, and cavitation can also damage the structure and shorten the life of the equipment. Background technique

[0002] Many devices are known at present, which include hydraulic pumps, hydraulic valves, hydraulic actuators, hydraulic motors and pressure exchangers described in Norwegian Patent Nos. Noise levels become unacceptable when used at higher rotational frequencies or under pressure. In practice, the last-mentioned type of equipment is particularly subject to these operating conditions, since the time in which both processes are to be carried out simultaneously within the...

Examples

Embodiment Construction

[0013] figure 1 All major components of a symmetrical end cap with high pressure port 1 and low pressure port 2 are shown. Although the aperture angles are the same in the figures, this is not necessary and may be advantageous in combination with a different number of channels in the rotor. There are two sealing areas on the end cover, one is the decompression area 3 between the high pressure side and the low pressure side, and the other is the pressurized area 4. According to the fact that the rotor channels rotate clockwise, all the rotor channels will pass from the high pressure port 1 through the decompression zone 3 to the low pressure port 2, so as to pass through the pressurized zone 4 and enter the high pressure port 1 again. Furthermore, the decompression zone 3 has an inlet edge and an outlet edge 6 , and the pressurization zone 4 has an inlet edge 7 and an outlet edge 8 , respectively. The angular extent of the sealing areas 3 and 4 covers at least one complete ro...

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