Multi-liquid mixing tool with check valve for backflow prevention
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Solution Overview
Problem
Existing multi-liquid mixing and discharging tools face challenges in preventing damage due to one liquid flowing back to the upstream side of the casing and solidifying, which can damage the tool body when injecting a mixed liquid at high pressure into a crack in a structure.
Innovation Solution
The tool incorporates a check valve in at least one of the first and second flow paths, a nozzle for mixing and discharging the liquids, and a casing with a wall portion to partition the flow paths, preventing backflow and solidification within the casing, and a detachable nozzle with an elastic body for stable high-pressure discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high pressure is applied to inject mixed liquid into a crack, then the mixed liquid can be injected effectively, but one liquid flows back to the upstream side of the casing and solidifies, damaging the tool body
Solution Approach 1:
A check valve is introduced as an intermediary component in the flow path between the casing and the nozzle. This check valve allows liquid to flow forward from the casing to the nozzle while preventing backward flow from the nozzle to the casing. By blocking the backflow path, the check valve prevents the liquid from solidifying in the upstream side of the casing, thus resolving the contradiction between achieving high-pressure injection and preventing tool body damage.
2Reliability
If a check valve is installed in the flow path, then liquid backflow and solidification are prevented, but the device complexity increases
Solution Approach 1:
The check valve is integrated directly into the casing structure, merging the check valve function with the existing casing components. Specifically, the check valve is formed as part of the casing's internal structure, combining the flow path and valve functions into a single integrated component. This merging approach prevents liquid backflow and solidification while minimizing the increase in device complexity by avoiding separate, standalone check valve assemblies.
3Ease of repair
If the nozzle is detachably attached to the casing, then maintenance is easier, but the number of parts increases
Solution Approach 1:
The nozzle is designed as a detachable component that can be separated from the casing for maintenance or replacement. This segmentation allows the nozzle to be independently serviced without disassembling the entire tool body, improving ease of repair. The detachable connection uses a simple coupling mechanism that adds minimal complexity while enabling convenient maintenance of the nozzle component.
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
Prevents damage to the tool body by preventing liquid backflow and solidification, allows for efficient high-pressure injection of the mixed liquid, and reduces the number of parts by integrating the check valve support and liquid supply components.
Implementation Method 1
a check valve installed at at least one of the first flow path or the second flow path
Implementation Method 2
a pump installed at the gripper and configured to be driven to independently and alternately pressure-feed a first liquid and a second liquid
Implementation Method 3
an elastic body attached to an outer periphery of a tip of the nozzle
Data Source
AI summary
A multi-liquid mixing and discharging tool includes a gripper configured to be held by an operator; a pump installed at the gripper and configured to be driven to independently and alternately pressure-feed a first liquid and a second liquid; a casing detachably attached to an outlet of the pump, and including a first flow path through which the first liquid is pressure-fed from a first outlet of the pump, a second flow path through which the second liquid is pressure-fed from a second outlet of the pump, and a check valve installed at at least one of the first flow path or the second flow path; and a nozzle through which the first liquid and the second liquid flowing in from the casing are mixed and discharged.