Automatic Oil Return Structure for Pressure-Controlled Piston Pumps
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Solution Overview
Problem
Conventional piston pumps require manual operation to return hydraulic oil to the storage container, which is inconvenient due to the instantaneous opening and closing of safety valves, limiting the efficient return of hydraulic oil.
Innovation Solution
An automatic oil return structure is integrated into the piston pump, featuring a piston assembly with inner and outer tubes, and a main body assembly with channels and one-way blocking assemblies to control hydraulic oil flow based on pressure, ensuring all hydraulic oil returns to the storage container automatically when pressure exceeds a preset value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety valve is used to release pressure when it reaches a preset value, then the compression requirement is met, but the valve opens and closes instantaneously allowing only a small amount of hydraulic oil to return
Solution Approach 1:
A controllable valve assembly is introduced as an intermediary between the high-pressure chamber and the hydraulic oil reservoir. This valve assembly includes a valve body with a through hole and a movable blocking component that can be precisely controlled to regulate the opening area, allowing gradual and complete drainage of hydraulic oil rather than instantaneous release.
Solution Approach 2:
The opening area of the controllable valve assembly is dynamically adjusted based on pressure parameters. When pressure exceeds the preset value, the valve opening area increases to accelerate hydraulic oil return; when pressure returns to normal, the valve closes completely. This dynamic parameter adjustment ensures both pressure control and complete oil drainage.
2Quantity of substance
If the user manually presses the oil relief lever to open the oil returning channel, then hydraulic oil can return to the storage container, but the operation process becomes extremely inconvenient and time-consuming
Solution Approach 1:
The controllable valve assembly automatically responds to pressure changes without manual intervention. When pressure in the high-pressure chamber exceeds the preset value, the valve automatically opens to allow hydraulic oil to drain; when pressure normalizes, the valve automatically closes. This self-service mechanism eliminates the need for manual operation of the oil relief lever.
Solution Approach 2:
The system incorporates pressure feedback through the pressure sensor that continuously monitors the high-pressure chamber pressure. When pressure exceeds the preset threshold, the control unit receives feedback and activates the controllable valve assembly to drain hydraulic oil, creating a closed-loop automatic control system that eliminates manual operation.
3Stress or pressure
If the safety valve opens instantaneously to release pressure, then pressure control is achieved, but the valve must be constantly manually operated to ensure complete hydraulic oil return
Solution Approach 1:
The controllable valve assembly transitions from a static instantaneous-opening valve to a dynamic valve with adjustable opening area. The valve opening area can be dynamically increased when pressure exceeds the preset value to accelerate hydraulic oil return, and then gradually closed as pressure normalizes, optimizing both pressure control and drainage efficiency without constant manual operation.
Solution Approach 2:
The controllable valve assembly maintains continuous useful action by remaining slightly open or periodically opening to ensure complete drainage of all hydraulic oil from the system. This continuous monitoring and adjustment prevents residual oil from remaining in the channels, eliminating the need for repeated manual operations and reducing total time for complete oil return.
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
The automatic oil return structure enables seamless and efficient hydraulic oil return to the storage container, eliminating the need for manual operation and ensuring precise control over piston movement by managing pressure fluctuations.
Implementation Method 1
The first one-way blocking assembly is capable of preventing the hydraulic oil from flowing from the first main section to the oil storage container
Implementation Method 2
The second one-way blocking assembly is capable of preventing the hydraulic oil from flowing from the second main section to the second oil reservoir
Implementation Method 3
The switch assembly is mounted in the switch channel and selectively blocks the switch channel
Implementation Method 4
The controlling assembly is mounted in the controlling channel and selectively blocks the controlling channel
Implementation Method 5
The pressurization channel has an end fluidly communicating with the switch channel and another end fluidly communicating with the first oil reservoir
Implementation Method 6
The oil returning channel has an end fluidly communicating with the switch channel and another end fluidly communicating with the oil storage container
Data Source
AI summary
The automatic oil return structure includes a piston assembly and a main body assembly. The piston assembly comprises an inner tube, an outer tube, and a displacement unit. The main body assembly comprises a first main section fluidly communicating with an oil storage container, a controlling assembly, an operating plug, and a switch channel fluidly communicating with the first main section, a pressurization channel, and an oil returning channel. When the pressure of the first main section achieves a maximum pressure, the pressure pushes the controlling assembly and the operating plug, and the oil storage container fluidly communicates with the first main section, lowering the pressure of the first main section. A switch assembly is moved to isolate the switch channel from the first main section, such that the switch channel fluidly communicates with the oil returning channel and the hydraulic oil keeps returning to the oil storage container.