Pump fluid end with toroidal surface at intersection of plunger bore and cross bore
A positive displacement pump system can include a fluid end block, which can be configured to provide a pumping chamber and control a flow of a fluid through the positive displacement pump system. The fluid end block can include a first cylindrical wall defining a plunger bore extending partially through the fluid end block and a second cylindrical wall defining a fluid conveying cross bore that intersects the plunger bore defining a bore intersection rim. A portion of the first bore intersection rim can include a first toroidal surface.
1 . A positive displacement pump system comprising:
a fluid end block configured to provide a pumping chamber and control a flow of a fluid through the positive displacement pump system, the fluid end block comprising:
a first cylindrical wall defining a plunger bore extending partially through the fluid end block;
a second cylindrical wall defining a fluid conveying cross bore that intersects the plunger bore defining a first bore intersection rim; and
wherein a portion of the first bore intersection rim comprises a first toroidal surface, wherein a center axis of a first toroid defining the first toroidal surface is not coincident with a center axis of the plunger bore and not coincident with a center axis of the fluid conveying cross bore.
2 . The positive displacement pump system of claim 1 , wherein the first toroidal surface is elliptical in cross section.
3 . The positive displacement pump system of claim 1 , wherein the first toroidal surface is present along a full length of the first bore intersection rim.
4 . The positive displacement pump system of claim 1 , wherein the center axis of the plunger bore is orthogonal to the center axis of the fluid conveying cross bore.
5 . The positive displacement pump system of claim 4 , wherein the center axis of the plunger bore and the center axis of the fluid conveying cross bore intersect.
6 . The positive displacement pump system of claim 5 , wherein a width of the first toroidal surface varies along the first bore intersection rim.
7 . The positive displacement pump system of claim 6 , wherein a width of the first toroidal surface reaches a minimum at a point where the first bore intersection rim intersects a plane defined by the center axis of the plunger bore and the center axis of the fluid conveying cross bore.
8 . The positive displacement pump system of claim 5 , wherein a first diameter of the plunger bore is different from a second diameter of the fluid conveying cross bore.
9 . The positive displacement pump system of claim 8 , wherein:
the plunger bore and the fluid conveying cross bore intersect along a second bore intersection rim; and
at least a portion of the second bore intersection rim defines a second toroidal surface.
10 . The positive displacement pump system of claim 1 , wherein the positive displacement pump system includes three plunger bores.
11 . The positive displacement pump system of claim 10 , comprising distinct fluid end blocks for each of the three plunger bores.
12 . The positive displacement pump system of claim 1 , wherein:
the plunger bore is configured to receive at least one of a plunger or piston; and
the fluid conveying cross bore is configured to transport fluid into the fluid end block during an intake stroke and expel fluid from the fluid end block during a pumping stroke.
13 . The positive displacement pump system of claim 12 , wherein the fluid conveying cross bore is configured to:
receive a first one-way valve to allow fluid into the fluid end block during the intake stroke; and
receive a second one-way valve to allow fluid to exit the fluid end block during the pumping stroke.
14 . The positive displacement pump system of claim 1 , wherein the center axis of the first toroid is substantially parallel to and offset laterally from at least one of the center axis of the plunger bore or the center axis of the fluid conveying cross bore.
15 . The positive displacement pump system of claim 14 , wherein the first bore intersection rim comprises a second toroidal surface.
16 . The positive displacement pump system of claim 15 , wherein:
a center axis of a second toroid defining the second toroidal surface is not coincident with the center axis of the plunger bore and not coincident with the center axis of the fluid conveying cross bore; and
the center axis of the second toroid is substantially parallel to and offset laterally from the at least one of the center axis of the plunger bore or the center axis of the fluid conveying cross bore in a direction substantially opposite from the center axis of the first toroid.
17 . The positive displacement pump system of claim 1 , wherein the center axis of the first toroid is offset at an angle from at least one of the center axis of the plunger bore or the center axis of the fluid conveying cross bore.
18 . A positive displacement pump system comprising:
a fluid end block, configured to provide a pumping chamber and control a flow of a fluid through the positive displacement pump system, the fluid end block comprising:
a first cylindrical wall defining a plunger bore extending partially through the fluid end block;
a second cylindrical wall defining a fluid conveying cross bore that intersects the plunger bore defining a bore intersection rim; and
wherein a portion of the bore intersection rim defines a first toroidal surface, wherein a center axis of a first toroid defining the first toroidal surface is not coincident with a center axis of the plunger bore and not coincident with a center axis of the fluid conveying cross bore.
19 . The positive displacement pump system of claim 18 , wherein the first toroidal surface includes a first radiused corner on an outside of the first toroidal surface nearest the plunger bore, and a second radiused corner on the outside of the first toroidal surface nearest the fluid conveying cross bore.
20 . A method of manufacturing a fluid end block of a positive displacement pump system, the method comprising:
manufacturing a first cylindrical wall defining a plunger bore extending partially through the fluid end block;
manufacturing a second cylindrical wall defining a fluid conveying cross bore that intersects the plunger bore defining a bore intersection rim; and
manufacturing a toroidal surface along a portion of the bore intersection rim, wherein a center axis of a toroid defining the toroidal surface is not coincident with a center axis of the plunger bore and not coincident with a center axis of the fluid conveying cross bore.
21 . The method of claim 20 , wherein manufacturing the toroidal surface along a portion of the bore intersection rim includes machining the toroidal surface.
22 . The method of claim 21 , wherein manufacturing the toroidal surface along at least a portion of the bore intersection rim includes:
boring the plunger bore and the fluid conveying cross bore; and
machining the toroidal surface along at least a portion of the bore intersection rim.
23 . The method of claim 20 , wherein manufacturing the toroidal surface along at least a portion of the bore intersection rim includes:
forming a mold configured to produce a fluid end block with the plunger bore, the fluid conveying cross bore, and the toroidal surface; and
casting the fluid end block.