Integrated Actuator Drive Cooling in Injection Molding Nozzles
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Solution Overview
Problem
Existing injection molding systems face challenges in efficiently managing heat within electrical drive systems, which can lead to overheating and reduced performance.
Innovation Solution
The proposed injection molding apparatus incorporates a heatable manifold to maintain molten injection fluid at a selected temperature, along with an electrical drive system where the actuator housing and drive mount are in heat communication with the manifold, and a heat absorptive fluid is used to absorb heat from these components during the injection cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electrical drive is integrated into the actuator housing and mounted in heat communication with the heated manifold, then the device complexity is reduced and space is saved, but the electrical drive components are exposed to high temperatures that can cause overheating and reduced performance
Solution Approach 1:
The actuator housing is segmented into thermally isolated zones: the electrical drive components are housed in a separate compartment thermally isolated from the heated manifold, while the actuator mechanism remains in thermal communication with the manifold. This segmentation allows the electrical components to be protected from high temperatures while maintaining the overall integrated structure.
Solution Approach 2:
A thermal barrier or insulating structure is introduced as an intermediary between the heated manifold and the electrical drive components. This intermediary element allows the electrical drive to be mounted on the actuator housing while preventing direct thermal communication with the high-temperature manifold, thus resolving the contradiction between integration and thermal protection.
2Reliability
If the electrical drive is mounted away from the heated manifold in a cool location, then the electrical components are protected from overheating, but the device complexity increases and the system requires more space
Solution Approach 1:
The electrical drive is merged with the actuator housing to form an integrated assembly, reducing device complexity and space requirements. The housing serves dual functions: as the structural enclosure for the actuator mechanism and as the mounting structure for the electrical drive components, eliminating the need for separate mounting locations.
Solution Approach 2:
The actuator housing is segmented into thermally isolated zones: the electrical drive components are housed in a separate compartment thermally isolated from the heated manifold, while the actuator mechanism remains in thermal communication with the manifold. This segmentation allows the electrical components to be protected from high temperatures while maintaining the overall integrated structure.
3Volume of moving object
If the electrical drive is integrated into the actuator housing, then the overall system size is reduced, but heat management becomes more difficult and overheating risks increase
Solution Approach 1:
The actuator housing is segmented into thermally isolated zones: the electrical drive components are housed in a separate compartment thermally isolated from the heated manifold, while the actuator mechanism remains in thermal communication with the manifold. This segmentation allows the electrical components to be protected from high temperatures while maintaining the overall integrated structure.
Solution Approach 2:
A thermal barrier or insulating structure is introduced as an intermediary between the heated manifold and the electrical drive components. This intermediary element allows the electrical drive to be mounted on the actuator housing while preventing direct thermal communication with the high-temperature manifold, thus resolving the contradiction between integration and thermal protection.
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 effectively manages heat within the injection molding system, enhancing the performance and efficiency of the electrical drive components while preventing overheating.
Implementation Method 1
the actuator housing and drive mount are in heat communication with the manifold, and a heat absorptive fluid is used to absorb heat from these components during the injection cycle
Data Source
AI summary
An injection molding apparatus (10) comprising:a heatable manifold (40) arranged to receive molten injection fluid (18);one or more nozzles (20, 22, 24);a flow channel (19, 42, 44, 46) arranged to deliver the molten injection fluid to a gate (32, 34, 36) of a mold cavity (30);an electrical drive (940d, 941d, 942d) adapted to receive and distribute electrical energy in controllably varied amounts during an injection cycle;a valve pin (1040, 1041, 1042);an actuator (940, 941, 942) coupled to the valve pin, the actuator having:a driver (940dr, 941dr, 942dr), arranged to receive the controllably varied electrical energy from the electrical drive,an actuator housing (940h, 941h, 942h);a source of heat absorptive fluid (260, 125f); andat least one channel (25, 33, 125) formed in or proximate one or the other or both of the actuator housing (940h, 941h, 942h) and the drive mount (940ds, 941ds) wherein the heat absorptive fluid absorbs heat from one or the other or both of the actuator housing and the drive mount.