CA2093226A1 - High pressure pump seal - Google Patents
High pressure pump sealInfo
- Publication number
- CA2093226A1 CA2093226A1 CA 2093226 CA2093226A CA2093226A1 CA 2093226 A1 CA2093226 A1 CA 2093226A1 CA 2093226 CA2093226 CA 2093226 CA 2093226 A CA2093226 A CA 2093226A CA 2093226 A1 CA2093226 A1 CA 2093226A1
- Authority
- CA
- Canada
- Prior art keywords
- pump
- plunger
- fluid
- pump chamber
- seal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
- F16J15/3236—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips with at least one lip for each surface, e.g. U-cup packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
- F04B53/162—Adaptations of cylinders
- F04B53/164—Stoffing boxes
Abstract
An improved high pressure reciprocating plunger pump (2) includes a seal for the plunger (8) comprising a V-shaped elastomeric seal member abutted against a backup member (20). The backup member (20) is made from an acetal polymer, e.g. a Delrin R type material, reinforced with high strength fibers, e.g. Kevlar R
fibers. This provides a backup member (20) having sufficient resistance to seal member extrusion as well as high strength for resisting side loads imposed by the plunger (8).
fibers. This provides a backup member (20) having sufficient resistance to seal member extrusion as well as high strength for resisting side loads imposed by the plunger (8).
Description
W 0 92/06298 2 ~ ~ 3 2 2 ~ PCT/US91/073~4 HIG~ PRESSURE PVMP SEAL
Technical Field This invention relates to high pressure pumps for supplying a liquid, such as water, at high pressure, e,g. approximately 5,000 p.s.i.
Specifically, this invention relates to reciprocating plunger pumps of ~his type and to a seal for sealing such plungers.
Back~round of the Invention High pressure water pumps are used in many different applications.
For example, high pressure water jets are used to clean ~arious surfaces or CUt different materials A new application for high pressure watel, recently introduced by The Toro Company, the assignee of this invention, is to aerate turf. In this application, the high pressure.water jets are directed against the ground, thereby forming holes in the turf.
Various pumps are known for providing high pressure water for use in these various applications. One such pump has a plurality of reciprocable plungers each received in a separate pump chamber. Water is introduced into each pump chamber through an inlet passage. The plungers are connected to a rotary crankshaft. As the crankshaft turns, each plunger is reciprocated in turn in its pump chamber to increase the pressure on the water received therein and pump such water out through an outlet passage. U.S. Patent 4,352,499 shows a reciprocating plunger pump of this ~ype.
A seal surrounds the plunger to prevent water from leaking from the high pressure side of the plunger back along the plunger. This seal conventionally comprises a V-shaped seal member backed by a metallic backup member. The backup member is often made of brass or a similar material. However, Applicant has discovered thae this seal has inadequate life at pressures up to approximately 5,000 p.s.i.
, . ' ~ . ' ' : ', W O ~2/06298 PCT/US91/07364 ~ 3~ 2 -Summarv of the In~ention Accordingly, one aspcct of the present invention is to provide a high pressure seal for use Ln a reciprocating plunger pump which will provide adequate life and performance at pressures at least up to approximately 5,000 p.s.i.
These and other aspects of this invention are embodied in a reciprocating plunger fluid pump provided with a plunger periphery sealing ~eans at the high pressure side of the plunger. The sealing means comprises a seal member made of a ~lexible material and having a predetermined cross-sectional confi~uration. A relatively rigid bac~up member is provided with a cavity shaped co receive the cross-sectional configuration of the seal member to allow the seal member to be abutte~
against the backup member with the seal member being received in the cavity. The backup member is made from a plastic material which is reinforced with high strength fibers.
.
Brief Description Of_The Drawin~s The present invention will be described in more detail in the following Detailed Description, taken in conjunction with the following drawings, in which like reference numerals refer to like elements throughou~.
Fig. l is a cross-soctional view of an improve~ reciproc~eing plunger pump according to this invention, particularly illustrating one pump chamber and plunger of the pump and where the seal assembly of this invention is located around the plun~er;
Fig. 2 is a cross-sectional view of the i~proved seal of this invention; and Fig. 3 is a cross-sectional view of the backup member which comprises a portion of the seal shown in Fig. 2.
Detailed Description This invention relates to a pump, identified as 2 in Fig. l, for pumping water ac pressures up to approximately 5,~00 p.s.i. Pump ~
- . : . ~ :.:. :
~ . ., . : . . .
W O 92/0529~ 2~ 26~ PcT/Us91to7364 inclu.. s a pump head 4 ha~ing at least one, and preferably more than one, pump chamber 6. While one pump chamber 6 is shown in Fig. 1, pumps of this type normally have at least three such chambers 6. A reciprocating plunger 8 is received in each pump chamber 6.
Plunger 8 has a working or high pressure end 10 received in pump chamber 6. The other end 12 of plunger 8 extends outwardly from pump head 4 and is connected by a conventional connecting rod (not shown) to a rotatable crankshaft 14. When crankshaft 14 is rotated, by any suitable power source, plungers 8 have their working ends 10 reciprocated in their respective pump ohambers 6. Typically, plungers 8 are rotated out-of-phase wi~h one another.
Pump head 4 includes an inlet passage 16 for brin&ing water into pump chamber 6. As plunger 8 is being withdrawn or pulled back in pump chamber 6, i.e. to the right in Fig. 1, a suction is developed in chamber o to assist in drawing the water from inlet passage 16 into pump chamber 6. In addition, pump head 4 also includes an outlet passage lP through which the water exits pump chamber 6. This occurs when plun~er 8 is forced back through pump chamber 6 toward the closed end thereof, i.e. to the left in Fig. 1. This movement of plunger 8 pressuri~es the water and forces it out through pump chamber outlet passage 18. Check valves are used in the inlet and outlet passages to prevent any backflow of water therein.
Plunger 8 is a solid cylindrical rod of uniform outer diameter.
However, plunger 8 could have a shape different than that shown herein.
Plunger B is simply a memher that is reciprocated in pump chamber 6 to pump and pressurize water introduced into that chamber. Reciprocating plunger pumps of this general type are well known.
The present invention comprises an improved seal assembly 20 i`or the periphery of each plunger 8 on the hi.gh pressure side 10. Seal assembl~
20 pre~ents leakage of water along the oueer diameter of plunger 8. Seal assembly 20 is carried in a seal retaining recess 21 formed in pump head.
and concentrically surrounds plunger 8 when plunger 8 is inserted in~o pump chamber 6. Seal assembly 20 will be retained in place in recess 21 when pump head 4 is bolted to the remaining housing portion of pump 2.
The main parts of seal assembly 20 are a flexible, ~-shaped seal member 22 and a backup member 24 which abuts against seal member 22. Seal member 22 is known as a chevron seal and is made of a nitrile impregna~ed ~ ~ .
. . .
: -- . ' ' ' .
W O 92/06298 ~6 PCT/US91tO7~
fabric ~aterial or any other 5uitable seal materials. Referrin~ to Fig.
3, backup member 24 ls relatively rigid and comprises an annular rlng having a V-shaped cavity 26 on the side adjacent seal member 22. As shown in Fig. l, backup member 24 directly abuts against seal member 22 with seal member 22 being received in the mating V-shaped cavity 26.
~ eferring now to Fig. 2, seal assembly 20 also includes a front ring 28 received within the V-shaped cross-section of seal member 22 which abuts against the closed forward end of seal receiving recess 21. Rin8 22 holds seal member 22 against backup member 24. In addition, a seal retainer 30 made from metal is located on the other side of backup member 24, i.e. on the back side. Seal retainer 30 will be sandwiched between backup member 24 and the remaining housing portion of pump 2 when pump head 4 is bolted chereto. Seal retainer 3a typically includes a U-shaped low pressure water seal member 32 to further seal against plunger 8. Low pressure seal member 32 will prevent leakage of any waeer that might escape past primary seal member 22.
In conventional pumps 2, backup member 24 is generally made of a rigid metallic material, such as brass. When attempting to use such pumps to pump water at pressures up to approximately 5,000 p.s.i., Applicant discovered that seals 20 would fail for a number of reasons. The brass backup 24 would transfer some heat to seal member 22, causing short seal life characterized by damage to the inner diameter seal lip. In addition, seal member 22 tends to extrude back past the brass backup 24 at these pressures, further contributing to seal failure.
In attempting to solve these seal life ~roblems, Applicant conceived of using a plastic material selected tO be compatible for use in water, i.e. would not swell, to make backup member 2~. Such a plastic backup was thought to be somewhat flexible or distortable under high pressures to fill in the gaps between plunger 8 and the surrounding casing walls ~o better prevent extrusion of seal member 22. However, Applicant also realized that backup member 24 is subjected to significant side loads from plunger 8 due to forces imposed by crankshaft rotation. Thus, seal assembly 20 would also have to func~ion as a bearing member for plunger 8.
Applicant experimented with various materials in attempting to desi~n an appropriate backup member. Nylon was not believed to be suitable as it has a tendency to swell in water. Backup members were made of various plastics, such as Teflon\ and Delrin\, and were reinforced with . , ~ ' ' . ',' '- '.
.
: : . . : . .. .
, , . . . . . ., . :
W O 9~/0629~ 2 ~ 2 6 P~T/US91/07364 - 5 - !
carbon graphite. However, these materials did not sufficiently take the side loads or have sufficient wear characteristics.
Applicant then conceived of making a backup member 24 from a suitable plastic member reinforced with a high strength fiber, such as the aramid fiber known as Kevlar\. Specifically, a backup member 24 was made by mixing pellets o~ an acetal polymer plastic, e.g. a Delrin\ type material, with chopped up Kevlar\ fibers approximately 3/8 inch long. The Kevlar\ fibers comprised approximately 30X by weight of the mixture. This mixture was then integrally molded inco backup member 24 using a conventional injection molding process. Both Delrin\ and Kevlar\ are trade~arks owned by ehe Dupone Company referring co well known and available products.
The Delrin\ backup 24 reinforced with Kevlar\ fibers provides an excellent backup member. It prevents seal extrusion at pressures up to 5,000 p.s.i. In addition, it does not transfer heat to seal member 22 and has excellent wear characteristics. Furthermore, i~ adequately handles the side loads imposed by the reciprocating plunger/crankshaft structure.
Accordingly, a pump 2 of economical construction is now able to pump water at préssures at least up to approximately 5,000 p.s.i.
In manufact1tring backup member 24, it was found that Kevlar\ fibers do not mix extremely well with the Dupont branded Delrin\ material.
However, Celaness also manufactures a Delrin type material, i.e. an acetal polymer, known as Celcon\. Kevlar\ fibers do mix well with the Celcon~
brand acetal poly~er. Thus, it is preferred that backup member 24 be manufactured by mixing the Kevlar\ fibers with the acetal polymer materials manufactured and sold by Celanese under the Celcon\ name.
Various modifications of this invention will be apparent to those skilled in the art. Thus, the scope of this invention is to be limited only by che appended claims.
Technical Field This invention relates to high pressure pumps for supplying a liquid, such as water, at high pressure, e,g. approximately 5,000 p.s.i.
Specifically, this invention relates to reciprocating plunger pumps of ~his type and to a seal for sealing such plungers.
Back~round of the Invention High pressure water pumps are used in many different applications.
For example, high pressure water jets are used to clean ~arious surfaces or CUt different materials A new application for high pressure watel, recently introduced by The Toro Company, the assignee of this invention, is to aerate turf. In this application, the high pressure.water jets are directed against the ground, thereby forming holes in the turf.
Various pumps are known for providing high pressure water for use in these various applications. One such pump has a plurality of reciprocable plungers each received in a separate pump chamber. Water is introduced into each pump chamber through an inlet passage. The plungers are connected to a rotary crankshaft. As the crankshaft turns, each plunger is reciprocated in turn in its pump chamber to increase the pressure on the water received therein and pump such water out through an outlet passage. U.S. Patent 4,352,499 shows a reciprocating plunger pump of this ~ype.
A seal surrounds the plunger to prevent water from leaking from the high pressure side of the plunger back along the plunger. This seal conventionally comprises a V-shaped seal member backed by a metallic backup member. The backup member is often made of brass or a similar material. However, Applicant has discovered thae this seal has inadequate life at pressures up to approximately 5,000 p.s.i.
, . ' ~ . ' ' : ', W O ~2/06298 PCT/US91/07364 ~ 3~ 2 -Summarv of the In~ention Accordingly, one aspcct of the present invention is to provide a high pressure seal for use Ln a reciprocating plunger pump which will provide adequate life and performance at pressures at least up to approximately 5,000 p.s.i.
These and other aspects of this invention are embodied in a reciprocating plunger fluid pump provided with a plunger periphery sealing ~eans at the high pressure side of the plunger. The sealing means comprises a seal member made of a ~lexible material and having a predetermined cross-sectional confi~uration. A relatively rigid bac~up member is provided with a cavity shaped co receive the cross-sectional configuration of the seal member to allow the seal member to be abutte~
against the backup member with the seal member being received in the cavity. The backup member is made from a plastic material which is reinforced with high strength fibers.
.
Brief Description Of_The Drawin~s The present invention will be described in more detail in the following Detailed Description, taken in conjunction with the following drawings, in which like reference numerals refer to like elements throughou~.
Fig. l is a cross-soctional view of an improve~ reciproc~eing plunger pump according to this invention, particularly illustrating one pump chamber and plunger of the pump and where the seal assembly of this invention is located around the plun~er;
Fig. 2 is a cross-sectional view of the i~proved seal of this invention; and Fig. 3 is a cross-sectional view of the backup member which comprises a portion of the seal shown in Fig. 2.
Detailed Description This invention relates to a pump, identified as 2 in Fig. l, for pumping water ac pressures up to approximately 5,~00 p.s.i. Pump ~
- . : . ~ :.:. :
~ . ., . : . . .
W O 92/0529~ 2~ 26~ PcT/Us91to7364 inclu.. s a pump head 4 ha~ing at least one, and preferably more than one, pump chamber 6. While one pump chamber 6 is shown in Fig. 1, pumps of this type normally have at least three such chambers 6. A reciprocating plunger 8 is received in each pump chamber 6.
Plunger 8 has a working or high pressure end 10 received in pump chamber 6. The other end 12 of plunger 8 extends outwardly from pump head 4 and is connected by a conventional connecting rod (not shown) to a rotatable crankshaft 14. When crankshaft 14 is rotated, by any suitable power source, plungers 8 have their working ends 10 reciprocated in their respective pump ohambers 6. Typically, plungers 8 are rotated out-of-phase wi~h one another.
Pump head 4 includes an inlet passage 16 for brin&ing water into pump chamber 6. As plunger 8 is being withdrawn or pulled back in pump chamber 6, i.e. to the right in Fig. 1, a suction is developed in chamber o to assist in drawing the water from inlet passage 16 into pump chamber 6. In addition, pump head 4 also includes an outlet passage lP through which the water exits pump chamber 6. This occurs when plun~er 8 is forced back through pump chamber 6 toward the closed end thereof, i.e. to the left in Fig. 1. This movement of plunger 8 pressuri~es the water and forces it out through pump chamber outlet passage 18. Check valves are used in the inlet and outlet passages to prevent any backflow of water therein.
Plunger 8 is a solid cylindrical rod of uniform outer diameter.
However, plunger 8 could have a shape different than that shown herein.
Plunger B is simply a memher that is reciprocated in pump chamber 6 to pump and pressurize water introduced into that chamber. Reciprocating plunger pumps of this general type are well known.
The present invention comprises an improved seal assembly 20 i`or the periphery of each plunger 8 on the hi.gh pressure side 10. Seal assembl~
20 pre~ents leakage of water along the oueer diameter of plunger 8. Seal assembly 20 is carried in a seal retaining recess 21 formed in pump head.
and concentrically surrounds plunger 8 when plunger 8 is inserted in~o pump chamber 6. Seal assembly 20 will be retained in place in recess 21 when pump head 4 is bolted to the remaining housing portion of pump 2.
The main parts of seal assembly 20 are a flexible, ~-shaped seal member 22 and a backup member 24 which abuts against seal member 22. Seal member 22 is known as a chevron seal and is made of a nitrile impregna~ed ~ ~ .
. . .
: -- . ' ' ' .
W O 92/06298 ~6 PCT/US91tO7~
fabric ~aterial or any other 5uitable seal materials. Referrin~ to Fig.
3, backup member 24 ls relatively rigid and comprises an annular rlng having a V-shaped cavity 26 on the side adjacent seal member 22. As shown in Fig. l, backup member 24 directly abuts against seal member 22 with seal member 22 being received in the mating V-shaped cavity 26.
~ eferring now to Fig. 2, seal assembly 20 also includes a front ring 28 received within the V-shaped cross-section of seal member 22 which abuts against the closed forward end of seal receiving recess 21. Rin8 22 holds seal member 22 against backup member 24. In addition, a seal retainer 30 made from metal is located on the other side of backup member 24, i.e. on the back side. Seal retainer 30 will be sandwiched between backup member 24 and the remaining housing portion of pump 2 when pump head 4 is bolted chereto. Seal retainer 3a typically includes a U-shaped low pressure water seal member 32 to further seal against plunger 8. Low pressure seal member 32 will prevent leakage of any waeer that might escape past primary seal member 22.
In conventional pumps 2, backup member 24 is generally made of a rigid metallic material, such as brass. When attempting to use such pumps to pump water at pressures up to approximately 5,000 p.s.i., Applicant discovered that seals 20 would fail for a number of reasons. The brass backup 24 would transfer some heat to seal member 22, causing short seal life characterized by damage to the inner diameter seal lip. In addition, seal member 22 tends to extrude back past the brass backup 24 at these pressures, further contributing to seal failure.
In attempting to solve these seal life ~roblems, Applicant conceived of using a plastic material selected tO be compatible for use in water, i.e. would not swell, to make backup member 2~. Such a plastic backup was thought to be somewhat flexible or distortable under high pressures to fill in the gaps between plunger 8 and the surrounding casing walls ~o better prevent extrusion of seal member 22. However, Applicant also realized that backup member 24 is subjected to significant side loads from plunger 8 due to forces imposed by crankshaft rotation. Thus, seal assembly 20 would also have to func~ion as a bearing member for plunger 8.
Applicant experimented with various materials in attempting to desi~n an appropriate backup member. Nylon was not believed to be suitable as it has a tendency to swell in water. Backup members were made of various plastics, such as Teflon\ and Delrin\, and were reinforced with . , ~ ' ' . ',' '- '.
.
: : . . : . .. .
, , . . . . . ., . :
W O 9~/0629~ 2 ~ 2 6 P~T/US91/07364 - 5 - !
carbon graphite. However, these materials did not sufficiently take the side loads or have sufficient wear characteristics.
Applicant then conceived of making a backup member 24 from a suitable plastic member reinforced with a high strength fiber, such as the aramid fiber known as Kevlar\. Specifically, a backup member 24 was made by mixing pellets o~ an acetal polymer plastic, e.g. a Delrin\ type material, with chopped up Kevlar\ fibers approximately 3/8 inch long. The Kevlar\ fibers comprised approximately 30X by weight of the mixture. This mixture was then integrally molded inco backup member 24 using a conventional injection molding process. Both Delrin\ and Kevlar\ are trade~arks owned by ehe Dupone Company referring co well known and available products.
The Delrin\ backup 24 reinforced with Kevlar\ fibers provides an excellent backup member. It prevents seal extrusion at pressures up to 5,000 p.s.i. In addition, it does not transfer heat to seal member 22 and has excellent wear characteristics. Furthermore, i~ adequately handles the side loads imposed by the reciprocating plunger/crankshaft structure.
Accordingly, a pump 2 of economical construction is now able to pump water at préssures at least up to approximately 5,000 p.s.i.
In manufact1tring backup member 24, it was found that Kevlar\ fibers do not mix extremely well with the Dupont branded Delrin\ material.
However, Celaness also manufactures a Delrin type material, i.e. an acetal polymer, known as Celcon\. Kevlar\ fibers do mix well with the Celcon~
brand acetal poly~er. Thus, it is preferred that backup member 24 be manufactured by mixing the Kevlar\ fibers with the acetal polymer materials manufactured and sold by Celanese under the Celcon\ name.
Various modifications of this invention will be apparent to those skilled in the art. Thus, the scope of this invention is to be limited only by che appended claims.
Claims (14)
1. A reciprocating plunger fluid pump, which comprises:
a pump head having at least one pump chamber;
inlet means for admitting a fluid into the pump chamber and outlet means for allowing the fluid to exit the pump chamber after the fluid has been pressurized within the pump chamber;
a plunger having a high pressure end received in the pump chamber for compressing and pressurizing the fluid admitted into the pump chamber as the high pressure end of the plunger is moved towards one end of the pump chamber;
drive means for reciprocating the plunger within the pump chamber with sufficient force to pressurize the fluid up to approximately at least 5,000 psi; and a sealing means located at the high pressure end of the plunger for sealing a periphery of the plunger and for preventing the pressurized fluid in the pump chamber from leaking between the plunger periphery and the pump chamber, wherein the sealing means comprises a seal member made of a flexible material and having a predetermined cross-sectional configuration extending between a front face and a back face of the seal member, a relatively rigid backup member provided with a cavity shaped to receive the cross-sectional configuration of the seal member such that the back face of the seal member is abutted against the cavity in the backup member in a mating face-to-face relationship such that the seal member is supported over its cross-sectional configuration by the cavity in the backup member, and wherein the backup member is made from a plastic material which is reinforced with high strength fibers.
a pump head having at least one pump chamber;
inlet means for admitting a fluid into the pump chamber and outlet means for allowing the fluid to exit the pump chamber after the fluid has been pressurized within the pump chamber;
a plunger having a high pressure end received in the pump chamber for compressing and pressurizing the fluid admitted into the pump chamber as the high pressure end of the plunger is moved towards one end of the pump chamber;
drive means for reciprocating the plunger within the pump chamber with sufficient force to pressurize the fluid up to approximately at least 5,000 psi; and a sealing means located at the high pressure end of the plunger for sealing a periphery of the plunger and for preventing the pressurized fluid in the pump chamber from leaking between the plunger periphery and the pump chamber, wherein the sealing means comprises a seal member made of a flexible material and having a predetermined cross-sectional configuration extending between a front face and a back face of the seal member, a relatively rigid backup member provided with a cavity shaped to receive the cross-sectional configuration of the seal member such that the back face of the seal member is abutted against the cavity in the backup member in a mating face-to-face relationship such that the seal member is supported over its cross-sectional configuration by the cavity in the backup member, and wherein the backup member is made from a plastic material which is reinforced with high strength fibers.
2. A reciprocating plunger fluid pump as recited in claim 1, wherein the plastic material comprises an acetal polymer.
3. A reciprocating plunger fluid pump as recited in, claim 2, wherein the high strength fibers comprise approximately 30% by weight of the backup member.
4. A reciprocating plunger fluid pump as recited in claim 2,
5. A reciprocating plunger fluid pump as recited in claim 4, wherein the high strength fibers comprise approximately 30% by weight of the backup member.
6. A reciprocating plunger fluid pump as recited in claim 1, wherein the high strength fibers comprise aramid fibers.
7. A reciprocating plunger fluid pump as recited in claim 1, wherein the seal member is a chevron shaped seal having a generally V-shaped cross-sectional configuration, and wherein the cavity in the backup member is V-shaped to receive the seal member therein.
8. A pump for supplying a fluid under relatively high pressure which comprises:
a pump head having at least one pump chamber, wherein the pump head includes inlet means for bringing the fluid into the pump chamber and outlet means through which the fluid exits the pump chamber;
a reciprocating plunger having a first, high pressure end received in the pump chamber and a second end which extends outwardly from the pump head;
drive means for continuously reciprocating the plunger within the pump chamber during operation of the pump to pressurize fluid admitted to the pump chamber through the inlet means; and a seal assembly for a peripheral surface of the plunger on the high pressure side thereof, wherein the seal assembly prevents leakage of the fluid between the peripheral surface of the plunger and the pump chamber, wherein the seal assembly concentrically surrounds the plunger when the plunger is received within the pump chamber, wherein the seal assembly comprises:
a flexible, V-shaped seal member; and a backup member which abuts against the seal member, wherein the backup member is relatively rigid and comprises an annular member having a V-shaped cavity on a side of the backup member adjacent the seal member, wherein the backup member directly abuts against one side of the seal member with the seal member being received in the mating V-shaped cavity of the backup member, and wherein the backup member is made from an acetal plastic material reinforced by high strength fibers.
a pump head having at least one pump chamber, wherein the pump head includes inlet means for bringing the fluid into the pump chamber and outlet means through which the fluid exits the pump chamber;
a reciprocating plunger having a first, high pressure end received in the pump chamber and a second end which extends outwardly from the pump head;
drive means for continuously reciprocating the plunger within the pump chamber during operation of the pump to pressurize fluid admitted to the pump chamber through the inlet means; and a seal assembly for a peripheral surface of the plunger on the high pressure side thereof, wherein the seal assembly prevents leakage of the fluid between the peripheral surface of the plunger and the pump chamber, wherein the seal assembly concentrically surrounds the plunger when the plunger is received within the pump chamber, wherein the seal assembly comprises:
a flexible, V-shaped seal member; and a backup member which abuts against the seal member, wherein the backup member is relatively rigid and comprises an annular member having a V-shaped cavity on a side of the backup member adjacent the seal member, wherein the backup member directly abuts against one side of the seal member with the seal member being received in the mating V-shaped cavity of the backup member, and wherein the backup member is made from an acetal plastic material reinforced by high strength fibers.
9. A pump as recited in claim 8, wherein the drive means includes a rotatable crankshaft connected to the second end of the plunger.
10. A pump as recited in claim 9, wherein the fibers comprise aramid fibers.
11. A pump as recited in claim 10, wherein the drive means is configured to pressurize the fluid up to approximately at least 5,000 psi within the pump chamber.
12. A pump as recited in claim 10, wherein the aramid fibers comprise approximately 30% by weight of the backup member.
13. A pump as recited in claim 8, wherein the drive means is configured to pressurize the fluid up to approximately at least 5,000 psi within the pump chamber.
14. A pump as recited in claim 13, wherein the fibers comprise aramid fibers.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US59152190A | 1990-10-02 | 1990-10-02 | |
| US591,521 | 1990-10-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2093226A1 true CA2093226A1 (en) | 1992-04-03 |
Family
ID=24366807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2093226 Abandoned CA2093226A1 (en) | 1990-10-02 | 1991-10-02 | High pressure pump seal |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH06504828A (en) |
| AU (1) | AU9043391A (en) |
| CA (1) | CA2093226A1 (en) |
| WO (1) | WO1992006298A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5592994A (en) * | 1994-12-15 | 1997-01-14 | Jks Boyles International Inc. | Propulsion seal for wire line core drilling apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100689946B1 (en) * | 1999-06-04 | 2007-03-09 | 그라코 인크. | Wet cup throat seal and bearing assembly |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4059280A (en) * | 1975-07-02 | 1977-11-22 | Hall & Hall Limited | Seal ring assembly |
| US4531749A (en) * | 1983-06-02 | 1985-07-30 | Hughes Tool Company | Circular seal with integral backup rings |
-
1991
- 1991-10-02 JP JP4500663A patent/JPH06504828A/en not_active Withdrawn
- 1991-10-02 AU AU90433/91A patent/AU9043391A/en not_active Abandoned
- 1991-10-02 WO PCT/US1991/007364 patent/WO1992006298A2/en active Application Filing
- 1991-10-02 CA CA 2093226 patent/CA2093226A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5592994A (en) * | 1994-12-15 | 1997-01-14 | Jks Boyles International Inc. | Propulsion seal for wire line core drilling apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06504828A (en) | 1994-06-02 |
| WO1992006298A3 (en) | 1993-08-19 |
| AU9043391A (en) | 1992-04-28 |
| WO1992006298A2 (en) | 1992-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |