Low Vibration Pump
AssigneeNitto Kohki Co., Ltd.
InventorsKenji Mizuno, Yasumasa Oki
Life of this patent
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Abstract
There is provided a liquid pump in which pulsation can be properly absorbed even if the pump is driven at a high frequency. A pulsation absorbing unit 14 for absorbing pulsation includes a pulsation absorbing housing 44 disposed on a pump housing member, a second diaphragm 48 attached to the pulsation absorbing housing member and defining a pulsation absorbing chamber 46 communicating with a liquid outlet passage 32 of a liquid pump unit, and a disc spring 50 for biasing the second diaphragm toward the pulsation absorbing chamber.
Claims8
A low vibration pump comprising a liquid pump unit and a pulsation absorbing unit, wherein
- the liquid pump unit comprises
- a pump housing including a top wall and a peripheral wall extending downwardly from a periphery of the top wall;
- a first diaphragm disposed in the pump housing so as to face the top wall and defining a pump chamber between the top wall and the first diaphragm;
- and,
- a drive unit connected to the central portion of the first diaphragm and reciprocally deforming the first diaphragm toward and away from the top wall,
- the pump housing having a liquid inlet passage for supplying liquid from an outside of the pump housing to the pump chamber, and a liquid outlet passage for discharging the liquid from the pump chamber to the outside of the pump housing;
- and
- the pulsation absorbing unit comprises
- a pulsation absorbing housing disposed on and secured to the top wall of the pump housing;
- a second diaphragm disposed in the pulsation absorbing housing and defining a pulsation absorbing chamber communicating with the liquid outlet passage of the liquid pump unit;
- and,
- a spring member for biasing the second diaphragm toward the pulsation absorbing chamber.
Dependencies are inferred from the claim text.