Chemical injector for spray device
View Patent ↗A spray device, such as one used with a pressure washer, includes a housing, a chemical container coupled to the housing, and a chemical conduit coupled to the container. The chemical conduit has an inlet and an outlet forming a chemical flow path therebetween. The spray device further includes a chemical flow controller allowing a user to adjust a chemical flow rate through the chemical conduit. Further, the spray device includes a water conduit forming a water flow path through the housing, the water conduit terminating at a spray orifice. The chemical flow path and the water flow path merge at a point proximate the orifice.
1. A high-pressure spray device, comprising:
a housing;
a chemical container carried on the housing;
a trigger coupled to the housing;
a water flow valve operated by the trigger;
a chemical conduit coupled to the container, the chemical conduit having an inlet and an outlet and forming a chemical flow path therebetween;
a water conduit forming a water flow path through the housing, the water conduit terminating at a spray orifice, wherein the chemical conduit extends into the water flow path and ends before the spray orifice; and
an inlet to the water flow path for receiving a high-pressure water flow, the inlet comprising a high-pressure coupling.
2. The device of claim 1 , further comprising a one-way valve positioned along the chemical flow path.
3. The device of claim 2 , further comprising a pump positioned along the chemical flow path.
4. The device of claim 3 , wherein the pump is a positive displacement pump having a pump inlet and a pump outlet.
5. The device of claim 4 , wherein the pump is configured to be manually operated.
6. The device of claim 5 , wherein the pump is configured to be powered by pushing an actuator.
7. The device of claim 5 , further comprising a manual actuator button coupled to the pump, wherein the pump operates in response to pressing of the manual actuator button.
8. The device of claim 1 , wherein the chemical container is a screw-on chemical container fastened directly to the housing.
9. The device of claim 1 , further comprising a plurality of parallel conduits positioned along the water flow path, wherein the plurality of parallel conduits are configured to collapse air bubbles, remove eddies, and guide flow in a forward direction along the water flow path.
10. The device of claim 9 , wherein the chemical conduit extends through a center of the plurality of parallel conduits such that the plurality of parallel conduits surrounds at least a portion of the chemical conduit, which extends in parallel with the plurality of parallel conduits.
11. The device of claim 9 , further comprising a screen positioned along the water flow path.
12. The device of claim 11 , further comprising a second screen positioned along the water flow path, wherein the screen and the second screen are positioned on opposite sides of the plurality of parallel conduits.
13. The device of claim 1 , further comprising a pressure washer including a pump for providing the high pressure water flow to the water conduit.