Stack-up assembly

Claim 2

A fluid pressure loaded pump having a stack of pump components loaded by an end plate and including a member defining a pumping chamber with fluid inlet and outlet passages, a rotor in the pumping chamber, a pressure plate bottomed on said member and covering the rotor, a separator plate overlying the pressure plate receiving the end plate thereagainst, said end plate having outlet channels, said pressure and separator plates having outlet ports registering with said channels, and said pressure and separator plates having surfaces in sealed mated engagement around the ports thereof together with a gap between the separator and pressure plates in the central portion thereof vented to the fluid inlet effective to prevent bowing of the pressure plate against the rotor under fluid pressure loading of the stack of components.

Claim 3

In a pump having a stack of pressure loaded pump components including a member defining a pump chamber, a pump rotor rotatably mounted in said chamber, a pressure plate bottomed on the member providing an end wall for the pump chamber and having inlet and outlet ports conveying fluid to and from the pump chamber, a separator plate overlying the pressure plate having outlet ports registering with the outlet ports of the pressure plate, and an end plate bottomed on the separator plate having outlet ports communicating with the outlet ports of said separator plate, the improvements of land areas surrounding the outlet ports of the pressure plate seated on the separator plate around the outlet ports of the separator plate to seal the outlet ports from the inlet ports and a gap between the separator and pressure plates communicating with the inlet ports of the pressure plate and effective to prevent deformation of the pressure plate against the rotor under pressures developed by the pump.

Claim 4

In a pump having a stack of pressure loaded pump components including a member defining a pump chamber, a pump rotor rotatably mounted in said chamber, a pressure plate bottomed on the member providing an end wall for the pump chamber and having inlet and outlet ports conveying fluid to and from the pump chamber, a separator plate overlying the pressure plate having outlet ports registering with the outlet ports of the pressure plate, and an end plate bottomed on the separator plate having outlet ports communicating with the outlet ports of said separator plate, the improvements of land areas surrounding the outlet ports of the pressure plate seated on the separator plate around the outlet ports of the separator plate to seal the outlet ports from the inlet ports and a gap between the separator and pressure plates communicating with the inlet ports of the pressure plate and effective to prevent deformation of the pressure plate against the rotor under pressures developed by the pump.

Claim 5

The pump of claim 2 wherein the land areas surrounding the outlet ports of the pressure plate are separated by a recessed area between the land areas.

Claim 6

The pump of claim pressure wherein the recessed area spans the center of the present plate.

Claim 7

The pump of claim 2 wherein the end plate has outlet openings communicating with the outlet ports of the separator plate, anD the recess is formed in the pressure plate.

Claim 8

The pump of claim 5 wherein the pressure plate is thicker than the separator plate.

Claim 9

A rotary pump comprising a housing, and end cap for the housing, a shaft rotatably supported in said end cap extending into the housing, an axial stack-up of pump parts in said housing including a bottom pressure plate bottomed on the end cap, a pumping chamber defining ring bottomed on the bottom pressure plate, a pump rotor in said ring coupled to said shaft, a second pressure plate bottomed on said ring, a separator plate bottomed on said second pressure plate, and a valve plate with an outlet passage bottomed on said separator plate, slippers carried by said rotor riding in said ring, seal means between the valve plate and housing separating the interior of the housing into an inlet chamber and a pressure chamber, said second pressure plate having inlets joining the inlet chamber of the housing with the interior of the chamber defining ring to supply fluid to be pumped by said slippers, said second pressure plate and separator plate having outlet ports joining the interior of the chamber defining ring with the outlet passage of the valve plate, means venting said pressure chamber in said housing to pressured fluid from the pump to act on the valve plate for axially biasing the stack of pump parts against the end cap of the housing, and said second pressure plate having land areas surrounding the outlet ports thereof mating with the separator plate around the outlet ports thereof together with a central relieved area between said land areas communicating with the inlets of the second pressure plate and providing a gap between the central portions of the separator and pressure plates to prevent any deformation of the separator plate under excessive fluid pressure loads from bowing the central portion of the pressure plate against said rotor whereby the stack of pump parts is pressure-loaded to maintain seals between the components in the stack and binding of the rotor by fluid pressure acting on the stack is eliminated.

Claim 10

A rotary pump comprising a housing, and end cap for the housing, a shaft rotatably supported in said end cap extending into the housing, an axial stack-up of pump parts in said housing including a bottom pressure plate bottomed on the end cap, a pumping chamber defining ring bottomed on the bottom pressure plate, a pump rotor in said ring coupled to said shaft, a second pressure plate bottomed on said ring, a separator plate bottomed on said second pressure plate, and a valve plate with an outlet passage bottomed on said separator plate, slippers carried by said rotor riding in said ring, seal means between the valve plate and housing separating the interior of the housing into an inlet chamber and a pressure chamber, said second pressure plate having inlets joining the inlet chamber of the housing with the interior of the chamber defining ring to supply fluid to be pumped by said slippers, said second pressure plate and separator plate having outlet ports joining the interior of the chamber defining ring with the outlet passage of the valve plate, means venting said pressure chamber in said housing to pressured fluid from the pump to act on the valve plate for axially biasing the stack of pump parts against the end cap of the housing, and said second pressure plate having land areas surrounding the outlet ports thereof mating with the separator plate around the outlet ports thereof together with a central relieved area between said land areas communicating with the inlets of the second pressure plate and providing a gap between the central portions of the separator and pressure plates to prevent any deformation of the separator plate under excessive fluid pressure loads from bowing the central portion of the pressure plate against said rotor whereby the stack of pump parts is pressure-loaded to maintain seals between the components in the stack and binding of the rotor by fluid pressure acting on the stack is eliminated.