Pump seal

Patent metadata

Field	Value
Publication number	US-2022018435-A1
Application number	US-202117375756-A
Country	US
Kind code	A1
Filing date	Jul 14, 2021
Priority date	Jul 15, 2020
Publication date	Jan 20, 2022
Grant date	—

Abstract

An annular seal for sealing an opening in a pump housing surrounding a piston rod includes a primary sealing portion with an inner surface adjacent to the piston rod and an outer surface adjacent to the pump housing. An initial sealing portion features an inner wall and an outer wall so that an annular space is defined therebetween. A top wall extends between the inner and outer walls. A coil spring is positioned within the annular space of the initial sealing portion and urges the inner wall into engagement with the piston rod and the outer wall into engagement with the pump housing.

First claim

What is claimed is:

1 . An annular seal for sealing an opening in a pump housing surrounding a piston rod comprising:
a primary sealing portion with an inner surface adjacent the piston rod and an outer surface adjacent the pump housing; an initial sealing portion featuring an inner wall and an outer wall so that an annular space is defined therebetween and a top wall extending between the inner and outer walls; wherein the primary sealing portion and the initial sealing portion are integrally formed together; and a coil spring positioned within the annular space of the initial sealing portion and configured so as to urge the inner wall into engagement with the piston rod and the outer wall into engagement with the pump housing.

2 . The seal of claim 1 , wherein the primary sealing portion has a generally trapezoidal cross section.

3 . The seal of claim 1 , wherein the inner and outer surfaces of the primary sealing portion are parallel.

4 . The seal of claim 1 , wherein the seal includes at least one convex portion between the inner and outer surface.

5 . The seal of claim 1 , wherein the primary sealing portion is comprised of a polytetrafluoroethylene.

6 . The seal of claim 5 , wherein the primary sealing portion is further comprised of at least one filler within the polytetrafluoroethylene.

7 . The seal of claim 6 , wherein the filler is carbon or graphite.

8 . The seal of claim 1 , wherein the coil spring is comprised of stainless steel.

9 . The seal of claim 1 , wherein the initial sealing portion is comprised of a polytetrafluoroethylene.

10 . The seal of claim 9 , wherein the initial sealing portion is further comprised of at least one filler within the polytetrafluoroethylene.

11 . The seal of claim 10 , wherein the filler is carbon or graphite

12 . The seal of claim 1 , further comprising an additional coil spring.

13 . The seal of claim 12 , wherein the coil springs are located on a horizontal plane, with one placed closer to the inner surface of the primary sealing portion and one placed closer to the outer surface of the primary sealing portion.

14 . The seal of claim 12 , wherein the coil springs are located on a vertical plane, with one placed closer to the top surface of the primary sealing portion and once placed closer to the bottom surface of the primary sealing portion.

15 . The seal of claim 14 , wherein the initial sealing portion has a top initial sealing portion and a bottom initial sealing portion wherein one coil spring is placed within the annular space of each sealing portion.

16 . An annular seal for sealing an opening in a pump housing surrounding a piston rod comprising:
a primary sealing portion with an inner surface adjacent the piston rod and an outer surface adjacent the pump housing; an initial sealing portion featuring an inner wall and an outer wall so that an annular space is defined therebetween; wherein the primary sealing portion and the initial sealing portion are integrally formed together; and an O-ring positioned within the annular space of the initial sealing portion and configured so as to urge the inner wall into engagement with the piston rod and the outer wall into engagement with the pump housing.

17 . The seal of claim 16 , wherein the O-ring is comprised of polytetrafluoroethylene.

18 . A pump for a cryogenic system comprising:
a piston rod; a pump housing; a retaining nut; a cylinder; an annular seal, wherein the annular seal comprises:
a primary sealing portion with an inner surface adjacent the piston rod and an outer surface adjacent the pump housing;
an initial sealing portion featuring an inner wall and an outer wall so that an annular space is defined therebetween and a top wall extending between the inner and outer walls;
wherein the primary sealing portion and the initial sealing portion are integrally formed together; and
a coil spring positioned within the annular space of the initial sealing portion and configured so as to urge the inner wall into engagement with the piston rod and the outer wall into engagement with the pump housing.

19 . The pump of claim 18 , further comprising an inlet port in liquid communication with the cylinder for intaking cryogenic liquid and an outlet port in liquid communication with the cylinder for dispensing cryogenic liquid.

20 . The pump of claim 18 , wherein the primary sealing portion is comprised of a polytetrafluoroethylene with a filler including carbon or graphite within the polytetrafluoroethylene.

Assignees

• Chart Inc

Inventors

• Thor Eric

Classifications

• F04B53/144

  Adaptation of piston-rods · CPC title

• F04B53/166

  Cylinder liners · CPC title

• F04B53/164

  Stoffing boxes · CPC title

• F16J15/56

  Other sealings for reciprocating rods · CPC title

• F04B53/146

  Piston-rod guiding arrangements · CPC title