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Pump

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Pump


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.
Related Terms: Spaces

USPTO Applicaton #: #20130028779 - Class: 418204 (USPTO) - 01/31/13 - Class 418 
Rotary Expansible Chamber Devices > Interengaging Rotating Members >Eccentrically Mounted

Inventors: Phil Chan Rha

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The Patent Description & Claims data below is from USPTO Patent Application 20130028779, Pump.

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CROSS REFERENCE TO RELATED APPLICATION

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

1. Field of the Invention

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 the cylinders are performed counteractively and continuously, thereby forcibly delivering fluid.

2. Description of Related Art

Several types of double action rotary pumps for forcibly delivering fluid have been developed and used to dates. Such a pump generally includes a transmission unit and an operating unit in order to forcibly deliver fluid.

The transmission unit of the pump includes a pair of crank-type first and second shafts, which operates at uniform and non-uniform angular speeds using driving force that is transmitted from a motor via a power transmission system, which is realized by combining concentric and eccentric gears. The operating unit is provided in series with the transmission unit so as to be connected to one side of the transmission unit. The operating unit includes an intake port and an exhaust port on both sides thereof. The operating unit also includes first and second cylinders, which are arranged in upper and lower positions, are divided from each other, and are connected to each other via a through-hole. In addition, in the operating unit, a piston includes a pair of heads, each of which is provided in a corresponding one of the first and second cylinders using a corresponding one of the first and second shafts such that the each head is eccentric from the center of the corresponding cylinder. The heads rotate at non-uniform angular speeds in a counteracting fashion while maintaining a distance between the shafts. The piston also includes a connector, which extends through the through-hole and connects the heads to each other. The volumes of spaces inside the cylinders, which are divided by the piston, are repeatedly and alternately contracted and expanded in response to the rotation of the piston, so that the cylinders counteractively and continuously perform the intake and exhaust operations, thereby forcibly delivering fluid.

According to the operating condition for the rotation of the piston, the angular speed of the heads varies depending on an angle of rotation in order to maintain the distance between the first and second shafts. That is, according to the mechanical principle, the distance between the first and second shafts essentially varies between non-uniform maximum and minimum distances when the first and second shafts operate in opposite directions. 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. Describing in more detail, one of the first and second shafts rotates at a uniform speed since driving force from the outside is directly delivered thereto. In addition, the other one of the first and second shafts operates at a lowest speed by gradually slowing down its rotation in the vicinity of 90° and 270° depending on the maximum and minimum diameter portions between the eccentric gears. The flow rate of fluid that is pumped varies depending on the angle of the shaft of the pump, i.e. the flow rate is the maximum at 0° and 180° and the minimum in the vicinity of 90° and 270°. In this fashion, the flow rate of one of the first and second cylinders is fixed but the flow rate of the other one of the first and second cylinders varies between the maximum and the minimum. 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.

In addition, in the pump as described above, the power transmission system that includes the concentric or eccentric gears is composed of several stages that use at least two sets of shafts in addition to the first and second shafts. 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. Therefore, the development of a technology that can overcome such problems is required.

The information disclosed in this Background of the Invention section is only for the enhancement of understanding of the background of the invention, and should not be taken as an acknowledgment or any form of suggestion that this information forms a prior art that would already be known to a person skilled in the art.

BRIEF

SUMMARY

OF THE INVENTION

Various aspects of the present invention provide a pump, in which driving force is distributed using a distribution stage and a delivery stage of a power transmission system, which is realized by combining concentric and eccentric gears, so that first and second shafts operate in counteractive non-uniform angular speeds. Accordingly, the sum of flow rates that are pumped by a piston at a predetermined time point can stay uniform, thereby enabling a fixed amount of fluid to be forcibly delivered, preventing surging, and improving the performance of the pump.

Also provided is a pump, in which first and second shafts of a transmission unit operate at non-uniform angular speeds using the power transmission system, which is realized by combining a worm, which moves like a pendulum, and a pair of eccentric worm gears, which are provided on both sides of the worm such that the worm is disposed in the middle between them. Accordingly, it is possible to simplify the structure, reduce the number of parts, and simplify the parts, thereby reducing the cost of manufacture.

Also provided is a pump, in which the power transmission system is realized by combining a minimum number of mechanical elements such that the length of a route along which power is transmitted and the stages of the power transmission system are decreased, thereby reducing mechanical friction and load. Accordingly, it is possible to reduce power consumption, increase the efficiency of operation, and improve the quality of the pump.

In an aspect of the present invention, provided is a double action rotary pump, which is intended to forcibly deliver fluid such as liquid or gas. The pump includes a transmission unit and an operating unit provided in series with the transmission unit. The transmission unit operates at uniform or non-uniform angular speeds using driving force that is transmitted from a motor via a power transmission system, which includes a combination of concentric and eccentric gears. In the operating unit, a piston 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 of the transmission unit is improved such that the sum of flow rates that are pumped by the piston at a predetermined time point stays uniform. Accordingly, a fixed amount of fluid can be forcibly delivered, thereby making it possible to prevent surging. In addition, it is possible to decrease the length of the route along which power is transmitted and reduce the number of the stages of the power transmission system by simplifying the structure, thereby reducing mechanical friction or load. Accordingly, it is possible to increase the operating efficiency of the pump and improve the quality of the pump.

According to embodiments of the invention, the driving force is distributed using the distribution stage and the delivery stage of the power transmission system, which is realized by combining concentric and eccentric gears, so that the first and second shafts operate in counteractive non-uniform angular speeds. Consequently, the sum of flow rates that are pumped by the piston at a predetermined time point can stay uniform, thereby enabling a fixed amount of fluid to be forcibly delivered, preventing surging. Accordingly, it is possible to remove noises or vibration, thereby improving the endurance of devices and improving the performance of the pump.

In addition, according to embodiments of the invention, it is possible to precisely measure a flow rate and forcibly deliver a fixed amount of fluid by maintaining the amount of fluid that is pumped by the pump to be uniform, thereby enabling high-precision control over forced delivery.

Furthermore, according to embodiments of the invention, the first and second shafts of the transmission unit operate at non-uniform angular speeds using the power transmission system, which is realized by combining the worm, which moves like a pendulum, and the pair of eccentric worm gears, which are provided on both sides of the worm such that the worm is disposed in the middle between them. Accordingly, it is possible to simplify the structure, reduce the number of parts, and simplify the parts, thereby reducing the cost of manufacture.

In addition, according to embodiments of the invention, the power transmission system is realized by combining a minimum number of mechanical elements such that the length of the route along which power is transmitted and the stages of the power transmission system are decreased, thereby reducing mechanical friction and load. Accordingly, it is possible to reduce power consumption, increase the efficiency of operation, and improve the quality of the pump.

Furthermore, according to embodiments of the invention, since the amount of fluid that is pumped by the pump is maintained uniform, it is possible to precisely measure a flow rate and forcibly deliver a fixed amount of fluid, thereby enabling high-precision control over forced delivery.

The methods and apparatuses of the present invention have other features and advantages which will be apparent from, or are set forth in greater detail in the accompanying drawings, which are incorporated herein, and in the following Detailed Description of the Invention, which together serve to explain certain principles of the present invention.



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stats Patent Info
Application #
US 20130028779 A1
Publish Date
01/31/2013
Document #
13556717
File Date
07/24/2012
USPTO Class
418204
Other USPTO Classes
418209
International Class
/
Drawings
14


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