초록 ▼

A mixing chamber assembly which has a reciprocating rod received within a mixing chamber of a mixing chamber member. The reciprocating rod is in a non-interference position with the mixing chamber over its entire length within the mixing chamber. The non-interference fit provides for continuous solv

A mixing chamber assembly which has a reciprocating rod received within a mixing chamber of a mixing chamber member. The reciprocating rod is in a non-interference position with the mixing chamber over its entire length within the mixing chamber. The non-interference fit provides for continuous solvent flow about the exterior of the rod and interior of the wall defining the mixing chamber such that solvent drips out the discharge end of the mixing chamber and the rod is free to float or ride on a film of solvent. The term "solvent" can include a combination of solvent and other ingredients such as lubricants, emulsifiers and flow control particles. The ability for the rod to ride on a film of solvent over the entire portion received within the mixing chamber, allows for a much reduced reciprocating motive force requirement and a corresponding freedom to increase the mixing chamber volume. The mixing chamber member is preferably received within a dispenser housing such that it is free to shift behind a dispensing and a non-dispensing mode with a shuttle valve arranged between the housing and mixing chamber to seal off chemical precursors for forming polyurethane foam or the like from entering the mixing chamber when the mixing chamber member is in a non-dispensing mode. A spring can be utilized to maintain the mixing chamber member in a non-dispensing state while a piston arrangement record with a piston chamber formed in the back of the dispenser housing can be used to reciprocate (at preferably different times) both the mixing chamber member and purge rod to the desired positions. A dispensing system is also provided wherein an intermittent, torque-based, and AC motor driven pump to provide the chemical precursors on demand, rather than continuously. Heated conduits are also employed to conduct the pumped chemicals to the dispenser.

대표청구항 ▼

[ What is claimed is:] [1.] A dispensing system for reactive foam material, comprising:a first chemical supply system;a second chemical supply system;a dispenser in fluid communication with said first and second chemical supply systems, said dispenser including an internal mixing area wherein a firs

[ What is claimed is:] [1.] A dispensing system for reactive foam material, comprising:a first chemical supply system;a second chemical supply system;a dispenser in fluid communication with said first and second chemical supply systems, said dispenser including an internal mixing area wherein a first chemical and a second chemical, respectively supplied from said first and second chemical supply systems, come in contact, said dispenser further comprising a purge rod received within and extending along with a mixed chemical outlet passageway of said dispenser which outlet passageway extends from a mixed chemical outlet in said dispenser and is in fluid communication with said mixing area;a solvent supply system in fluid communication with said dispenser for supplying solvent to said dispenser, and said dispenser including a solvent flush passageway arrangement which is designed such that solvent supplied from said solvent supply system flows from a solvent source to and past an outlet end of said purge rod such that a flushing solvent supply is provided between a surface of said dispenser defining said outlet passageway and an external surface of said purge rod received within said outlet passageway.