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Gas-driven liquid pump

Gas-driven liquid pump description/claims

1. Field of the Invention

The present invention relates to liquid pumps and, particularly, to a gas-driven liquid pump.

2. Description of Related Art

Gas-driven diaphragm pumps are widely used in industrial drainage systems. A typical gas-driven diaphragm pump includes a first working chamber, a second working chamber, a connection pole for connecting the first working chamber with the second working chamber. A first diaphragm is positioned in the first working chamber. A second diaphragm is positioned in the second working chamber. One end of the connection pole is connected to the first diaphragm, and another end of the connection pole is connected to the second diaphragm. The first diaphragm and the second diaphragm are synchronously driven, by the connection pole, in their corresponding working chamber. The pumping or draining process, of the air-driven diaphragm pump, can be performed by the synchronous action of the first and second diaphragm. This type of gas-driven diaphragm pumps can pump or drain a large volume of water, so gas-driven diaphragm pumps are often used in large-scale drainage systems. However, the gas-driven diaphragm pumps are complex in structure and large in size due to the size of the working chambers. Thus, a large space/area is required to function such gas-driven diaphragm pump.

However, some industry drainage systems need small-sized liquid pump to pump or drain water. Particularly, in a wetting process for making flexible printed circuit boards, a small quantity of water is sprayed on and wet the surface of the flexible printed circuit boards. In order to meet such requirement, a gas-driven liquid pumping apparatus having a small size is desired.

An embodiment of a gas-driven liquid pump includes a gas source, a tank, a pumping pipe, at least one gas conveying pipe, and at least one liquid conveying pipe. The pumping pipe includes a gas input end, a liquid output end and a suction portion located between the gas input end and the liquid output end. An inner diameter of the pumping pipe gradually decreases from the gas input end to the suction portion, and gradually increases from the suction portion to the liquid output end. At least one gas conveying pipe is configured for connecting the gas source and the gas input end of the pumping pipe. At least one liquid conveying pipe is configured for connecting the tank and the pumping pipe. One end of the liquid conveying pipe is connected to the tank, and another end is engaged with the suction portion of the pumping pipe.

Advantages and novel features will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

Many aspects of the present gas-driven liquid pump can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present gas-driven liquid pump. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a schematic, isometric view of a gas-driven liquid pump, in accordance with a present embodiment.

FIG. 2 is a schematic, cross-sectional view along line II-II of FIG. 1, but showing a pumping pipe of the gas-driven liquid pump.

Embodiments will now be described, in detail, below with reference to the drawings.

FIG. 1 shows a gas-driven liquid pump 100 for removing liquids. The present gas-driven liquid pump 100 can be used to remove liquid waste during the manufacturing of printed circuit boards. The gas-driven liquid pump 100 includes a tank 10, a liquid conveying pipe 20, a gas source 30, a gas conveying pipe 31, and a pumping pipe 40. The gas source 30 is to generate pressurized gas. The pressurized gas can be transmitted to the pumping pipe 40 by the gas conveying tube 31. The tank 10 is provided for containing liquids. The liquid conveying pipe 20 is configured for feeding the liquids from the tank 10 to the pumping pipe 40.

In detail, one end of the liquid conveying pipe 20 is connected to the tank 10, and another end of the liquid conveying pipe 20 is connected to the pumping pipe 40. One end of the gas conveying pipe 31 is connected to the pumping pipe 40, and another end of the gas conveying pipe 31 is connected to the gas source 30. Advantageously, a valve (not shown) can be arranged on the gas conveying pipe 31 to control a pressure of the pressurized gas entering into the pumping pipe 40. Similarly, a valve (not shown) can be arranged on the liquid conveying pipe 20 to control the flow of the liquid from the tank 10 to the pumping pipe 40. It is to be understood that the liquid conveying pipe 20 and the gas conveying pipe 31 can be two or more pipes for transmitting liquid or gas, respectively.

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• Utility Patent

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