Pump

Abstract

A double action rotary pump forcibly delivers fluid such as liquid or gas. A transmission unit operates at uniform or non-uniform angular speeds using driving force transmitted from a motor via a power transmission system. An operating unit is provided in series with the transmission unit. A piston of the operating unit has a pair of heads, which rotate at non-uniform angular speeds in a counteracting fashion while maintaining the distance between shafts, and divides the spaces inside cylinders. The volumes of the divided spaces of the cylinders are repeatedly and alternately contracted and expanded in response to the rotation of the piston, so that the cylinders counteractively and continuously perform intake and exhaust operations, thereby forcibly delivering fluid. The structure of the power transmission system is improved such that the sum of flow rates that are pumped by the piston at a predetermined time point stays uniform.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The present application claims priority from Korean Patent Application Numbers 10-2011-75023 filed on Jul. 28, 2011 and 10-2012-26107 filed on Mar. 14, 2012, the entire contents of which application are incorporated herein for all purposes by this reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a double action rotary pump, which is intended to forcibly deliver fluid such as liquid or gas. More particularly, the present invention relates to a pump, in which spaces of cylinders are divided by a piston that has a pair of heads, each of which is provided inside a corresponding cylinder so as to be eccentric from the center of the cylinder such that each head rotates inside the cylinder. In this pump, the volumes of the divided spaces of the cylinders are repeatedly and alternately contracted and expanded in response to the rotation of the heads so that intake and exhaust operations of ...

AI Technical Summary

Benefits of technology

This patent describes a pump that uses a special power transmission system to ensure the driving force is evenly distributed. This is achieved by combining concentric and eccentric gears, resulting in non-uniform angular speeds of the first and second shafts. This design ensures a stable flow of fluid, preventing surging or fluctuation in performance. The pump is also simplified in structure, reducing the number of parts and cost of manufacture. Additionally, the pump uses a minimum number of mechanical elements, reducing mechanical friction and load, leading to improved efficiency and quality of operation.

Problems solved by technology

However, in the pump configured as above, variable long and short distances between the shafts are mutually corrected due to the operation at uniform and non-uniform angular speeds, so that an intended pumping operation is enabled.

However, in the operation of this type of pump, one of the first and second shafts operates at non-uniform speeds.

Due to the non-uniform angular operation that is intended to correct the distance between the shafts, the flow rate of fluid that is forcibly delivered is non-uniform, which is attributable to changes in the angular speed due to the maximum and minimum diameter portions between the eccentric gears.

Consequently, the sum of the instantaneous flow rates that are pumped by the pump is not uniform.

Therefore, the non-uniformity of the flow rate of fluid that is pumped is a main reason for surging that would cause a problem in the operation of the pump.

The surging of the pump causes a number of problems, which degrade the quality of the pump.

Specifically, the surging creates noises and vibration, decreases the lifespan of devices, decreases the efficiency of the pump, and disables high-precision control over forced delivery, such as delivery at a fixed amount.

Therefore, the spatial arrangement of the power transmission system is difficult.

The configuration is complicated since several types of gears having large and small diameters are systematically and continuously associated with adjacent elements.

Consequently, there are problems in that is difficult to fabricate the pump and that the cost of manufacture of the pump increases.

Furthermore, since the power transmission system is composed of several stages, the distance of a power transmission route unnecessarily extends, thereby increasing the distance between an input and an output of driving force.

In addition, mechanical friction or load between mechanical elements in respective stages increases power loss, so that power that is consumed in the operation of the pump increases, thereby decreasing the operating efficiency of the pump.

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