초록 ▼

A mixing head for a high velocity reaction injection apparatus for mixing and dispensing two or more liquid components. The mixing head includes a mixing chamber with two or more inlets for the separate components and an outlet for dispensing the mixed components, and an injection housing for inject

A mixing head for a high velocity reaction injection apparatus for mixing and dispensing two or more liquid components. The mixing head includes a mixing chamber with two or more inlets for the separate components and an outlet for dispensing the mixed components, and an injection housing for injecting each component through a corresponding inlet. Component flow is directed through a flow accelerating passage in the injection housing prior to injection into the mixing chamber, for imparting a pressure drop in the component on the downstream side of the passage, and means are provided for selectively blocking the inlets for terminating the dispensing of the mixed components and thereby increasing the component pressure in the injection housing downstream of the passage. A recirculation line communicates with each injection housing downstream of the passage, and means responsive to component pressure downstream of the passage directs the flow through the recirculation line when the mixing chamber inlet is blocked, and blocks the flow into the recirculation line when the inlet is open.

대표청구항 ▼

A method of mixing a plurality of reactive components in a mixing head having a mixing chamber with an inlet for each component and an outlet for the mixed components, and a reciprocatable piston disposed in said chamber and movable between a retracted position in which the inlets are open and an ex

A method of mixing a plurality of reactive components in a mixing head having a mixing chamber with an inlet for each component and an outlet for the mixed components, and a reciprocatable piston disposed in said chamber and movable between a retracted position in which the inlets are open and an extended position in which the inlets are blocked, comprising the steps of: (a) supplying each component under pressure to an injection housing, through a passage therein for each component, wherein each passage has an outlet arranged to direct the respective component at one said inlet for introduction into said mixing chamber; (b) directing each component, prior to entering said mixing chamber, through a nozzle for accelerating said components prior to delivery into the mixing chamber, said nozzle receiving its component from said passage; (c) selectively moving said piston to block the inlets to prevent flow therethrough to thereby interrupt mixing; (d) said blocking of each inlet producing an increase in pressure of the component downstream of said passage to thereby divert the flow to a recirculation system connected to each injection housing without interrupting the component delivery through said passages and to said inlets; and (e) selectively retracting said piston to open said inlets to simultaneously cease recirculation and re-institute mixing, wherein mixing is re-instituted without interrupting the component delivery through said passages.