Portable Fuel Pump Sealing and Sensor Layout to Prevent Leakage
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Solution Overview
Problem
Existing fuel pumps face limitations due to single power supply mode, risk of liquid leakage due to inadequate sealing, and difficulty in determining the motor's operational status without an indicator light, leading to inconvenient operation and potential shutdowns.
Innovation Solution
The fuel pump design includes a control box, pump body, and gun nozzle with enhanced sealing mechanisms using glands and rubber components, an exhaust valve to prevent siphoning, and a control mechanism with an indication lamp to clearly show the motor's status, along with an infrared sensor positioned outside the liquid flow to avoid misjudgments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the motor is disposed in the liquid for portable operation, then the fuel pump achieves portability and compactness, but the motor housing requires complete sealing which is difficult to achieve with conventional sealing structures
Solution Approach 1:
The sealing structure is divided into multiple independent sealing components: a sealing ring disposed in a groove on the motor shaft, and a sealing component disposed in a groove on the motor housing. This segmentation allows each sealing element to independently handle sealing at different locations, improving overall sealing reliability while maintaining the compact motor-in-liquid configuration
Solution Approach 2:
The sealing ring and sealing component are nested within grooves on the motor shaft and motor housing respectively, with the sealing elements positioned concentrically around the motor shaft. This nested arrangement maximizes the use of limited space within the motor housing while ensuring effective sealing between the motor components and the liquid environment
2Ease of manufacture
If a conventional cylindrical sealing structure is used for the motor housing, then the manufacturing is simple, but the sealing area is small and compression forces are not aligned, causing sealing failure and liquid leakage
Solution Approach 1:
Instead of a uniform cylindrical sealing structure, the patent introduces localized sealing features: a sealing ring in a specific groove on the motor shaft and a sealing component in a groove on the motor housing. These localized sealing elements concentrate the sealing function at critical interfaces, providing adequate sealing area and aligned compression forces where needed most, while keeping the overall manufacturing process simple
3Extent of automation
If the infrared sensor switch is disposed in the fuel outlet to detect liquid flow, then the detection function is integrated, but liquid flows to the sensor head position causing mistaken touching and false shutdown
Solution Approach 1:
The infrared sensor is extracted from the fuel outlet environment and relocated to the control box, which is positioned away from the liquid flow path. This extraction eliminates the problem of liquid contacting the sensor head, preventing false shutdowns while maintaining the automatic detection function through the sensor's connection to the control circuit board
4Device complexity
If no indicator light is provided on the key switch, then the device structure is simple, but it is inconvenient to determine whether the motor is working
Solution Approach 1:
An indicator light is added to the control box that changes color or illuminates to indicate the motor's operational status. This visual feedback mechanism allows users to easily determine whether the motor is working without adding significant structural complexity, as the indicator light can be integrated into the existing control circuit board and power supply system
Data Source
AI summary
A fuel pump includes a control box, a pump body, and a gun nozzle. A motor housing is fixedly connected to an inner wall of the pump body, a motor is disposed in the motor housing. A first sealing mechanism is disposed between a first side of the motor housing and an output shaft of the motor. A second sealing mechanism is disposed between a second side of the motor housing and a power line of the motor. An impeller is fixedly connected to one end of the output shaft of the motor. One end of the pump body is fixedly connected to a pressure chamber, and a liquid inlet is defined on one side of the pressure chamber and a liquid outlet is defined on one side of the pump body, where the one side of the pressure chamber faces away from the one side of the pump body.