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A fluid pump includes a pump body having a fluid path with an inlet and an outlet. The fluid pump also includes a diaphragm disposed along the fluid path between the inlet and the outlet, a non-return valve to control direction of flow along the fluid path, and a diaphragm actuating unit. The diaphr

A fluid pump includes a pump body having a fluid path with an inlet and an outlet. The fluid pump also includes a diaphragm disposed along the fluid path between the inlet and the outlet, a non-return valve to control direction of flow along the fluid path, and a diaphragm actuating unit. The diaphragm actuating unit includes an unbalanced motor. Further, a steam generator may include the fluid pump.

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1. A fluid pump comprising: a pump body having a fluid path with an inlet and an outlet;a diaphragm disposed along the fluid path between the inlet and the outlet;a non-return valve to control direction of flow along the fluid path;a diaphragm actuator comprising an unbalanced motor;a motion constra

1. A fluid pump comprising: a pump body having a fluid path with an inlet and an outlet;a diaphragm disposed along the fluid path between the inlet and the outlet;a non-return valve to control direction of flow along the fluid path;a diaphragm actuator comprising an unbalanced motor;a motion constraining unit to constrain a motion of the unbalanced motor; anda controller configured to adjust an amplitude of the motion of the unbalanced motor by adjusting power to the unbalanced motor,wherein the motion constraining unit has a hinge and is configured to pivotally mount the unbalanced motor to the pump body through the hinge. 2. The fluid pump according to claim 1, wherein the unbalanced motor is fixedly connected to the diaphragm. 3. The fluid pump according to claim 2, wherein a motor body of the unbalanced motor is connected to the diaphragm. 4. The fluid pump according to claim 1, wherein the motion constraining unit is configured to constrain degrees of freedom of the motion of the unbalanced motor. 5. The fluid pump according to claim 4, wherein the motion constraining unit is configured to constrain the unbalanced motor to move substantially along one plane. 6. The fluid pump according to claim 5, wherein the motion constraining unit is configured to restrict the amplitude of the motion of the unbalanced motor. 7. The fluid pump according to claim 6, wherein the motion constraining unit comprises at least one stopper such that a maximum amplitude of the motion of the unbalanced motor is limited by the at least one stopper. 8. The fluid pump according to claim 7, wherein the motion constraining unit comprises a resilient member. 9. The fluid pump according to claim 8, wherein the resilient member is a leaf spring. 10. The fluid pump according to claim 9, wherein the motion constraining unit is on the pump body or a housing in which the pump body is mounted. 11. The fluid pump according to claim 1, wherein the unbalanced motor is a low voltage DC motor. 12. The fluid pump according to claim 1, wherein the controller is configured to operate the unbalanced motor to control a flow rate of the fluid pump. 13. A steam generator comprising a fluid pump, the fluid pump comprising: a pump body having a fluid path with an inlet and an outlet; a diaphragm disposed along the fluid path between the inlet and the outlet; a non-return valve to control direction of flow along the fluid path; a diaphragm actuator comprising an unbalanced motor; a hinge; a motion constraining unit to constrain a motion of the unbalanced motor; and a controller configured to adjust an amplitude of motion of the unbalanced moto motor by adjusting power to the unbalanced motor, wherein the motion constraining unit has a hinge and is configured to pivotally mount the unbalanced motor to the pump body through the hinge. 14. The steam generator of claim 13, wherein the hinge includes a stopper configured to limit the amplitude of the motion of the unbalanced motor.