Pump Bypass Valve Variable Cross-Section Actuation
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Solution Overview
Problem
Existing high-pressure cleaning pumps face challenges in minimizing flow losses during circulatory operation, leading to increased mechanical and thermal loads when the switching plunger fails to actuate properly, causing continued circulation and potential damage.
Innovation Solution
The design includes a valve body that gradually increases the flow cross-section as it moves from a closed to an open position, allowing the cleaning liquid to flow with minimal resistance initially, ensuring the switching plunger can actuate reliably and reducing flow losses by maintaining a small cross-section until a predetermined distance is reached, then expanding to allow efficient flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve body is subjected to the greatest possible differential pressure to support the movement of the switching plunger, then the switching plunger can reliably overcome a certain distance to actuate the switching element, but the cleaning liquid in the bypass line suffers considerable flow losses
Solution Approach 1:
The valve body is designed to initially maintain a small flow cross-section when opening, creating high differential pressure that acts on the piston rod before the bypass line is fully opened. This preliminary high-pressure phase provides sufficient force to reliably actuate the switching plunger and switching element, after which the flow cross-section increases to reduce energy losses during continued circulatory operation
Solution Approach 2:
The flow cross-section of the bypass line is made dynamically adjustable through the valve body's movement. The valve body transitions from a closed position to an open position, and during this transition, the flow cross-section increases from a small initial value to a larger final value. This dynamic adjustment allows the system to first generate high differential pressure for reliable switching plunger actuation, then reduce flow resistance for efficient circulatory operation
2Productivity
If the pump continues to operate in circulatory operation due to switching element damage, then the pump remains active, but the high differential pressure causes continued mechanical and thermal loads
Solution Approach 1:
The valve body design ensures that during the initial phase of opening, a small flow cross-section is maintained to generate high differential pressure that reliably actuates the switching plunger and switching element. Only after this preliminary switching action is completed does the flow cross-section increase to its larger size, thereby reducing flow losses and minimizing mechanical and thermal loads during continued circulatory operation, even if the switching element subsequently fails
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures the switching plunger can reliably actuate to switch off the pump, minimizing mechanical and thermal loads during circulatory operation by maintaining low flow losses, even if the switching element is damaged, and allows efficient return of cleaning liquid with reduced pressure and heat loads.
Implementation Method 1
the valve body releases a passage upstream of the valve seat through which cleaning fluid can flow, the flow cross section of which widens when the valve body assumes a predetermined distance from the valve seat
Implementation Method 2
an actuator, which moves the valve body into a closed position or an open position, depending on the flow rate of the cleaning liquid in the pressure line
Implementation Method 3
a pump for a high-pressure cleaning device for conveying a cleaning liquid, having at least one pump chamber into which at least one piston that can be moved back and forth is immersed
Data Source
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AI summary
The invention relates to a pump for a high-pressure cleaning device, designed to convey a cleaning liquid. Said pump comprises a pump housing containing at least one pump chamber into which at least one reciprocally movable piston is plunged, and which is connected to a suction line by means of at least one inlet valve, and to a pressure line by means of at least one outlet valve. Said pump also comprises a bypass line leading from the pressure line to the suction line, and containing an overflow valve. The valve body of the overflow valve is connected to an actuator which shifts the valve body to a closed or an open position according to the flow rate of the cleaning liquid in the pressure line, and shifts a switch tappet, coupled to the valve body, to a first or a second switch position. To ensure that the switch tappet reliably covers a specific distance, thereby activating a switching element, when the pump goes into circulation mode, while at the same time ensuring that the flow loss of said cleaning liquid is kept to a minimum when the pump remains in circulation mode for a long time, according to the invention, during the transition from a closed position to an open position the valve body releases a passage upstream of the valve seat through which the cleaning liquid can flow. The flow cross-sectional area of said passage becomes wider when the valve body is a predetermined distance from the valve seat.