Liquid Discharge Device with Extraction Heater and Circulation Flow
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Solution Overview
Problem
Existing liquid material discharge devices face challenges in maintaining constant temperature and minimizing pump pulsation, leading to temperature reduction and increased device size and weight due to heater placement, as well as inefficient energy use and difficulty in temperature control in branched flow passages.
Innovation Solution
A liquid material discharge device with a nozzle and valve seat featuring a reciprocating needle, a vertically extending liquid chamber, and a circulation flow passage system including an outer and inner flow passage within a rod-shaped flow passage formation member, which reduces temperature fluctuations and pump pulsation through controlled flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heater is arranged near the discharge port to maintain liquid material temperature, then temperature control is improved, but the size and weight of the discharge head increase
Solution Approach 1:
The heater is extracted from the discharge head structure and relocated to the circulation piping. This separation allows the discharge head to remain compact and lightweight while the heater maintains liquid material temperature in the circulation system, resolving the contradiction between temperature control and discharge head weight.
2Temperature
If a heater is arranged near the discharge port to maintain liquid material temperature, then temperature control is improved, but the device size increases
Solution Approach 1:
The heater is extracted from the discharge head and positioned in the circulation piping instead. This allows the discharge head to maintain a compact size while the heater continues to effectively control the liquid material temperature through the circulation system.
3Productivity
If the liquid material circulates through a flow passage communicating the discharge port and circulation tubing line, then continuous supply is improved, but temperature reduction occurs due to lack of heater in the flow passage
Solution Approach 1:
The heater in the circulation piping performs preliminary heating of the liquid material before it reaches the discharge port. This preliminary action ensures that the liquid material maintains its temperature throughout the circulation flow passage, enabling continuous supply without temperature reduction.
4Stability of the object's composition
If an accumulator is disposed in the circulation tubing line to reduce pump pulsation, then pump pulsation control is improved, but device complexity increases
Solution Approach 1:
The accumulator function is merged into the circulation piping structure itself rather than being a separate component. This integration reduces device complexity while maintaining the ability to control pump pulsation and stabilize the liquid material flow.
Data Source
AI summary
A discharge device and method can eliminate the influence of pump pulsation while temperature reduction of liquid material is minimized. The discharge device includes a nozzle (19) having a discharge port (28) a valve seat (31) having a communication bore (30) communicating with the discharge port, a liquid chamber (33) extending vertically, a needle (4) for opening and closing the communication bore of the valve seat, and a circulation flow passage through which the liquid material is supplied to the liquid chamber. The device further includes a rod-shaped flow passage formation member (34) provided with an outer flow passage (36) having a top opening (40) formed at an upper end and a bottom opening (41) formed at a lower end, and with an inner flow passage (35) having a bottom opening (41) in communication with an outer flow passage and a top opening (38).