System and method for a pump with reduced form factor
View Patent ↗Embodiments of the present invention provide pumps with features to reduce form factor and increase reliability and serviceability. Additionally, embodiments of the present invention provide features for gentle fluid handling characteristics. Embodiments of the present invention can include a pump having a motor driven feed stage pump and a motor driven dispense stage pump. The feed stage motor and the feed stage motor can include various types of motors and the pumps can be rolling diaphragm or other pumps. According to one embodiment, a dispense block defining the pump chambers and various flow passages can be formed out of a single piece of material.
1. A multi-stage pump configured to dispense photoresist chemicals comprising:
a pump inlet flow path;
a pump outlet flow path;
a feed pump having a feed chamber in fluid communication with the pump inlet flow path:
a dispense pump having a dispense chamber in fluid communication with the pump outlet flow path;
a filter in fluid communication with the feed chamber and the dispense chamber;
a dispense block formed of a single piece of material defining at least a portion of the feed chamber and at least a portion of the dispense chamber; and
a set of valves to selectively allow fluid flow through the multi-stage pump.
2. The multi-stage pump of claim 1 , wherein the dispense block fully defines a first and second portion of the pump inlet flow path, a first and second portion of a feed stage outlet flow path, a first and second portion of a dispense stage inlet flow path, a first and second portion of a vent flow path, a first and second portion of a purge flow path and at least a portion of the pump outlet flow path.
3. The multi-stage pump of claim 2 , wherein:
the first portion of the pump inlet flow path leads from an inlet to an inlet valve and the second portion of the pump inlet flow path leads from the inlet valve to the feed chamber;
the first portion of the feed stage outlet flow path leads from the feed chamber to an isolation valve and the second portion of the feed stage outlet flow path leads from the isolation valve to the filter;
the first portion of the dispense stage inlet flow path leads from the filter to a barrier valve and the second portion of the dispense stage inlet flow path leads from the barrier valve to the dispense chamber;
the first portion of the vent flow path leads from the filter to a vent valve and the second portion of the vent flow path leads from the vent valve to a vent outlet;
the first portion of the purge flow path leads from the dispense chamber to a purge valve and the second portion of the purge flow path leads from the purge valve to the feed chamber.
4. The multi-stage pump of claim 3 , wherein the feed pump comprises a stepper motor and the dispense pump comprises a brushless DC motor.
5. The multi-stage pump of claim 3 , further comprising a valve plate coupled to a single face of the dispense block, the valve plate and the dispense block defining to define valve chambers for the inlet valve, the isolation valve, the barrier valve and the purge valve, wherein the valve chambers are disposed on a single side of the valve plate facing the dispense block.
6. The multi-stage pump of claim 5 , further comprising a sheet of elastomeric material coupled between the valve plate and the dispense block.
7. The multi-stage pump of claim 1 , wherein the dispense block comprises one or more features to lead drips away from on-board electronics.
8. A multi-stage pump configured to dispense photoresist chemicals comprising:
a pump inlet flow path;
a pump outlet flow path;
a dispense block formed of a single piece of material defining at least a portion of a dispense chamber in fluid communication with the pump outlet flow path and at least a portion of a feed chamber in fluid communication with the pump inlet flow path;
a filter in fluid communication with the feed chamber and the dispense chamber;
a feed stage diaphragm movable in the feed chamber;
a feed piston to move the feed stage diaphragm;
a feed motor coupled to the feed piston to reciprocate the feed piston;
a dispense diaphragm movable in the dispense chamber;
a dispense piston to move the dispense diaphragm;
a dispense motor coupled to the dispense piston to reciprocate the dispense piston;
a valve plate coupled to the dispense block, the valve plate and dispense block defining valve chambers for an inlet valve, an isolation valve, a barrier valve and a purge valve, wherein the valve plate defines the valve chambers on a single side of the valve plate and wherein the valve plate is coupled to an end face of the dispense block.
9. The multi-stage pump of claim 8 , wherein the dispense block further defines a first and second portion of the pump inlet flow path, a first and second portion of a feed stage outlet flow path, a first and second portion of a dispense stage inlet flow path, a first and second portion of a vent flow path, a first and second portion of a purge flow path and at least a portion of the pump outlet flow path.
10. The multi-stage pump of claim 9 , wherein:
the first portion of the pump inlet flow path leads from an inlet to the inlet valve and the second portion of the pump inlet flow path leads from the inlet valve to the feed chamber;
the first portion of the feed stage outlet flow path leads from the feed chamber to the isolation valve and the second portion of the feed stage outlet flow path leads from the isolation valve to the filter;
the first portion of the dispense stage inlet flow path leads from the filter to the barrier valve and the second portion of the dispense stage inlet flow path leads from the barrier valve to the dispense chamber;
the first portion of the vent flow path leads from the filter to a vent valve and the second portion of the vent flow path leads from the vent valve to a vent outlet;
the first portion of the purge flow path leads from the dispense chamber to the purge valve and the second portion of the purge flow path leads from the purge valve to the feed chamber.
11. The multi-stage pump of claim 8 , further comprising a sheet of elastomeric material coupled between the valve plate and the dispense block.
12. The multi-stage pump of claim 8 , further comprising a pressure sensor positioned to read pressure in the dispense chamber.
13. A method for a multi stage pump configured to dispense photo resist chemicals, the method comprising:
forming a dispense block of a single piece of material, the dispense block at least partially defining a feed chamber, a dispense chamber, a pump inlet flow path and a pump outlet flow path;
mounting a dispense diaphragm between the dispense block and a dispense pump piston housing;
mounting a feed stage diaphragm between the dispense block and a feed pump piston housing;
coupling a feed pump piston to a feed pump motor via a feed pump lead screw;
positioning the feed pump piston so that the feed pump piston contacts the feed stage diaphragm;
positioning a dispense pump piston so that the dispense pump piston contacts the dispense diaphragm; and
coupling a filter to the dispense block such that the filter is in fluid communication with the dispense chamber and the feed chamber.
14. The method of claim 13 , wherein the dispense block further defines a first and second portion of the pump inlet flow path, a first and second portion of a feed stage outlet flow path, a first and second portion of a dispense stage inlet flow path, a first and second portion of a vent flow path, a first and second portion of a purge flow path and at least a portion of the pump outlet flow path.
15. The method of claim 14 , wherein:
the first portion of the pump inlet flow path leads from an inlet to an inlet valve and the second portion of the pump inlet flow path leads from the inlet valve to the feed chamber;
the first portion of the feed stage outlet flow path leads from the feed chamber to an isolation valve and the second portion of the feed stage outlet flow path leads from the isolation valve to the filter;
the first portion of the dispense stage inlet flow path leads from the filter to a barrier valve and the second portion of the dispense stage inlet flow path leads from the barrier valve to the dispense chamber;
the first portion of the vent flow path leads from the filter to a vent valve and the second portion of the vent flow path leads from the vent valve to a vent outlet;
the first portion of the purge flow path leads from the dispense chamber to a purge valve and the second portion of the purge flow path leads from the purge valve to the feed chamber.
16. The method of claim 15 , further comprising coupling a valve plate to the dispense block, wherein the valve plate at least partially defines one or more valves.
17. The method of claim 16 , wherein the valve plate partially defines the inlet valve, the vent valve, the isolation valve, the barrier valve, and the purge valve all on one side of the valve plate.
18. The method of claim 17 , further comprising selectively directing vacuum pressure to the inlet valve, the vent valve, the isolation valve, the barrier valve, and the purge valve.