Pump device for fluid dispenser

Abstract

A pump device for fluid dispensers is provided whose chamber is partitioned into a pressure room and a fluid room. A piston element is engaged inside the pressure room by an actuating rod to push the piston element downward, or by a resilient element beneath the piston element to restore the piston element back to the top. An air valve element at the bottom of the piston element automatically opens or closes the induction of air to the pressure room when the piston element is moved upward or downward. The fluid room is dedicated to the passage of the fluid. A normally closed fluid valve element is provided at the bottom of the fluid room. When the fluid in the container device is pressurized, the fluid pushes open the fluid valve element, flows into the fluid room and then out of the spout of the pump device.

Description

BACKGROUND OF THE INVENTION [0001] (a) Technical Field of the Invention [0002] The present invention generally relates the pump device for fluid dispensers, and more particular to a pump device having partitioned rooms for air and fluid separately. [0003] (b) Description of the Prior Art [0004] Fluid dispensers are commonly found in the household kitchens and bathrooms for holding liquid soaps and detergents, shampoo and conditioners, hand and body lotions, etc. A fluid dispenser usually contains a fluid container device and a pump device mounted on top of the container device. A conventional pump device is shown in FIG. 1. [0005] As illustrated, the conventional pump device mainly contains a spout A1, a hollow actuating rod A2 attached to the bottom of the spout A1, a fastening element A3 for locking the spout A1 when the pump device is not in use, a closure cap A4 for locking the pump device to the container device (not shown), a hollow chamber A5, a plug element A7 attached to th...

AI Technical Summary

Benefits of technology

"The present invention provides a new structure for pump devices of fluid dispensers to overcome shortcomings of prior approaches. The main characteristic of the invention is that the pump device has a chamber partitioned into a pressure room and a fluid room, with an air valve element at the bottom of the piston element to control air pressure in the container device. The fluid room is dedicated to the passage of the fluid, with a normally closed fluid valve element at the bottom. This separation of pressure room and fluid room avoids the erosion and deterioration of components often found in prior art, resulting in a longer operation life of the pump device. The air pressure is directly applied to the fluid to drive them out of the container device via a shorter passageway, making the pump more responsive to user operation, requiring less effort, and not having the dripping problem, even for fluid of high viscosity."

Problems solved by technology

Additionally, the separation of pressure room and the fluid room avoids the erosion and deterioration of the components as often found in prior arts resulted from their direct contact with and immersion within the fluid, thereby lengthening the operation life of the pump device considerably.

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