Reciprocating Piston Pump With Variable Supplementary Chamber
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Solution Overview
Problem
Conventional pumps lack the ability to precisely and continuously vary conveying speed without changing the drive frequency, making it difficult to adjust material flow according to process-dependent parameters, especially when handling different materials from separate containers.
Innovation Solution
A reciprocating piston pump design with a supplementary chamber that allows the size of the conveying chamber to be changed during operation, enabling the volume delivered per work cycle to be adjusted without altering the operating frequency, by using a variable supplementary space that can be controlled to change the volume ratio between the first and second piston chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the conveying speed is changed by adjusting the drive device frequency, then the conveying speed can be varied, but the control becomes too sluggish, too imprecise or too complex for process-dependent parameters
Solution Approach 1:
The pump chamber volume is made dynamically adjustable during operation through a variable volume mechanism. The displacement member can change the volume of the pump chamber between a first volume and a second volume, allowing the conveying speed to be varied by changing the volume ratio between pump chamber and delivery chamber, rather than through complex frequency control of the drive device.
2Measurement precision
If the pump chamber volume is kept constant in conventional pumps, then the pumping speed can be easily calculated and specified, but the conveying speed cannot be precisely determined or controlled
Solution Approach 1:
The pump chamber volume is made dynamically adjustable during operation through a variable volume mechanism. The displacement member can change the volume of the pump chamber between a first volume and a second volume, allowing the conveying speed to be varied by changing the volume ratio between pump chamber and delivery chamber, rather than through complex frequency control of the drive device.
Solution Approach 2:
The invention changes the physical parameter of pump chamber volume from constant to variable. By adjusting the volume of the pump chamber relative to the delivery chamber, the conveying speed can be precisely controlled. The volume ratio between pump chamber and delivery chamber becomes the control parameter for conveying speed.
3Adaptability or versatility
If multiple pumps are driven in a coupled manner, then they can convey different materials, but the conveying speeds of the pumps can only be changed together
Solution Approach 1:
The pump chamber volume is made dynamically adjustable during operation through a variable volume mechanism. The displacement member can change the volume of the pump chamber between a first volume and a second volume, allowing the conveying speed to be varied by changing the volume ratio between pump chamber and delivery chamber, rather than through complex frequency control of the drive device.
4Speed
If a separate return system is used to pump material back into the material container, then the conveying speed can be varied, but high costs and high pump pressure are required
Solution Approach 1:
The pump chamber volume is made dynamically adjustable during operation through a variable volume mechanism. The displacement member can change the volume of the pump chamber between a first volume and a second volume, allowing the conveying speed to be varied by changing the volume ratio between pump chamber and delivery chamber, rather than through complex frequency control of the drive device.
Data Source
Figure 1A~1D
Figure 2
Figure 3A'~4B''
AI summary
The pump (1) has a conveying chamber filled with fluid material (2) in a working stage of the pump and drained in another working stage of the pump. Size of the conveying chamber is changed during the pump operation such that different volumes of the material are conveyed during different operating cycles of a conveying process and/or the conveying chamber has an additional chamber (10) with an additional area (12). Volume of the additional area is changed during the pump operation independent of volume of a pump chamber of the conveying chamber. Independent claims are also included for the following: (1) a system comprising two pumps connected with one another (2) a method for controlling conveying speed of a pump.