CA2124225A1 - Low pulsation pump mechanism and pump - Google Patents
Low pulsation pump mechanism and pumpInfo
- Publication number
- CA2124225A1 CA2124225A1 CA 2124225 CA2124225A CA2124225A1 CA 2124225 A1 CA2124225 A1 CA 2124225A1 CA 2124225 CA2124225 CA 2124225 CA 2124225 A CA2124225 A CA 2124225A CA 2124225 A1 CA2124225 A1 CA 2124225A1
- Authority
- CA
- Canada
- Prior art keywords
- cam
- cross head
- pump
- fixed
- camshaft
- 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
Landscapes
- Reciprocating Pumps (AREA)
Abstract
ABSTRACT
An improved low pulsation positive displacement pump includes a cross head that is rotationally stabilized with respect to the housing of the pump by a screw and slot arrangement for improved cam and cam follower alignment with low resultant horizontal forces.
An improved low pulsation positive displacement pump includes a cross head that is rotationally stabilized with respect to the housing of the pump by a screw and slot arrangement for improved cam and cam follower alignment with low resultant horizontal forces.
Description
a IMPROVED LOW PULSATION PUMP MECHANISM AND PUMP
BACKGROUND OF THE INVENTION
This invention relates to positive displacement pumps, and more particularly, to a low pulsation positive displacement pump mechanism and pump.
The pump mechanism of the present invention utilizes a symmetric cam profile such that the camshaft can be installed without a need to distinguish the ends of the camshaft for reliable and efficient assembly. The camshaft also provides versatility in that the drive end of the camshaft can be engaged from either side of the pump mechanism.
The pump mechanism also utilizes a cross head that is rotationally stabilized with respect to the housing of the pump by a screw-slot arrangement. The screw-slot arrangement is superior in providing maximum stability and minimum horizontal force to the cross head.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG.1 is a cross-sectional view of a pump mechanism according to the present invention.
FIG.2 is cross-sectional orthogonal view of an assembled camshaft according to FIG.1 FIG.3 is a cross-sectional view of a pump according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG.S 1-3, a preferred embodiment of the low pulsation pump and pump mechanism includes a housing (10) encasing the pump and pump mechanism. A
camshaft (12) having one or a plurality of cams (14) is rotationally mounted within the housing (10). Each cam (14) preferably has a symmetric profile. The camshaft (12) can be oriented with respect to either - 2 - L ~ i~ 2 2 ~
side of the housing (10). A cam -follower (16) is mounted on a follower arm (17) and provided in biased :
contact with each cam (14). Means are provided to prevent rotation of each follower arm (17) relative to the respective cam.
Specifically referring to FIG.3, each cam :
follower (16) transmits the rotational motion of the cam (14) to the piston rod (18) which, in turn, transfers the rotational motion as linear motion to a piston (20). The piston (20) sealingly engages and is reciprocable within a cylinder (22) secured to a manifold assembly (24) releasably attached to the housing (10). The manifold assembly (24) includes an intake chamber (26), an output chamber (28) and a pumping chamber (30) communicating with the cylinder (22). A check valve (32) separates the intake chamber (26) from the pumping chamber (30) and permits fluid flow only form the intake chamber (26) to the pumping ~:
chamber (30). A similar check valve (34) separates the output chamber (28) from the pumping chamber (30) and permits fluid flow only from the pumping chamber (30) into the output chamber (28). Reciprocation of the piston (20) in response to the follower (16) following the cam (14) will result in fluid being drawn from the intake chamber (26) into the pumping chamber (30) and then forced into the output chamber (28).
Specifically shown in FIG.1 are means (36, 38, 40) for preventing rotation of each follower arm (17) with respect to the corresponding cam (14) in order to maintain contact between the follower (16) and cam (14). A cup-shaped cross head (40) having a bottom closed end and a top open end is fixed to the follower arm (17) at the bottom end. A piston rod (18) is fixed generally concentrically within the cross head (40). The cross head (40) reciprocates with the follower arm 17 and piston rod 18 in response to ~or ~ } ~ ~
_ 3 _ ~ I ~` 12 2.~
rotation of the camshaft 12 and cam 14. An extending member, such as a screw (36) or other suitable member, is fixed relative to the housing 10 and extends into a longitudinal groove or slot (38) to maintain s rotational stability of the cross head (40), follower arm (17) and cam follower 16 during reciprocation. A
spring (42) or other suitable biasing member is provided to resiliently bias the cross head (40), and thus the follower (16), against the cam (14). As illustrated in the preferred embodiment, a spring (42) is fixed with respect to the housing (10) and positioned in engagement with the cross head (40).
With specific reference to FIG.2, there is shown a camshaft (12) having cams (14) attached to the camshaft (12) by conventional keys (44). Each cam (14) is separated on the camshaft (12) by spacers (46). Due to the symmetry of each cam (14), the drive end (50) can be positioned at either side of the housing (10).
While the embodiment of the present invention has been disclosed herein, it will be appreciated that various changes and modifications may be made thereto without departing from the spirit of the invention as defined by the scope of the claims.
BACKGROUND OF THE INVENTION
This invention relates to positive displacement pumps, and more particularly, to a low pulsation positive displacement pump mechanism and pump.
The pump mechanism of the present invention utilizes a symmetric cam profile such that the camshaft can be installed without a need to distinguish the ends of the camshaft for reliable and efficient assembly. The camshaft also provides versatility in that the drive end of the camshaft can be engaged from either side of the pump mechanism.
The pump mechanism also utilizes a cross head that is rotationally stabilized with respect to the housing of the pump by a screw-slot arrangement. The screw-slot arrangement is superior in providing maximum stability and minimum horizontal force to the cross head.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG.1 is a cross-sectional view of a pump mechanism according to the present invention.
FIG.2 is cross-sectional orthogonal view of an assembled camshaft according to FIG.1 FIG.3 is a cross-sectional view of a pump according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG.S 1-3, a preferred embodiment of the low pulsation pump and pump mechanism includes a housing (10) encasing the pump and pump mechanism. A
camshaft (12) having one or a plurality of cams (14) is rotationally mounted within the housing (10). Each cam (14) preferably has a symmetric profile. The camshaft (12) can be oriented with respect to either - 2 - L ~ i~ 2 2 ~
side of the housing (10). A cam -follower (16) is mounted on a follower arm (17) and provided in biased :
contact with each cam (14). Means are provided to prevent rotation of each follower arm (17) relative to the respective cam.
Specifically referring to FIG.3, each cam :
follower (16) transmits the rotational motion of the cam (14) to the piston rod (18) which, in turn, transfers the rotational motion as linear motion to a piston (20). The piston (20) sealingly engages and is reciprocable within a cylinder (22) secured to a manifold assembly (24) releasably attached to the housing (10). The manifold assembly (24) includes an intake chamber (26), an output chamber (28) and a pumping chamber (30) communicating with the cylinder (22). A check valve (32) separates the intake chamber (26) from the pumping chamber (30) and permits fluid flow only form the intake chamber (26) to the pumping ~:
chamber (30). A similar check valve (34) separates the output chamber (28) from the pumping chamber (30) and permits fluid flow only from the pumping chamber (30) into the output chamber (28). Reciprocation of the piston (20) in response to the follower (16) following the cam (14) will result in fluid being drawn from the intake chamber (26) into the pumping chamber (30) and then forced into the output chamber (28).
Specifically shown in FIG.1 are means (36, 38, 40) for preventing rotation of each follower arm (17) with respect to the corresponding cam (14) in order to maintain contact between the follower (16) and cam (14). A cup-shaped cross head (40) having a bottom closed end and a top open end is fixed to the follower arm (17) at the bottom end. A piston rod (18) is fixed generally concentrically within the cross head (40). The cross head (40) reciprocates with the follower arm 17 and piston rod 18 in response to ~or ~ } ~ ~
_ 3 _ ~ I ~` 12 2.~
rotation of the camshaft 12 and cam 14. An extending member, such as a screw (36) or other suitable member, is fixed relative to the housing 10 and extends into a longitudinal groove or slot (38) to maintain s rotational stability of the cross head (40), follower arm (17) and cam follower 16 during reciprocation. A
spring (42) or other suitable biasing member is provided to resiliently bias the cross head (40), and thus the follower (16), against the cam (14). As illustrated in the preferred embodiment, a spring (42) is fixed with respect to the housing (10) and positioned in engagement with the cross head (40).
With specific reference to FIG.2, there is shown a camshaft (12) having cams (14) attached to the camshaft (12) by conventional keys (44). Each cam (14) is separated on the camshaft (12) by spacers (46). Due to the symmetry of each cam (14), the drive end (50) can be positioned at either side of the housing (10).
While the embodiment of the present invention has been disclosed herein, it will be appreciated that various changes and modifications may be made thereto without departing from the spirit of the invention as defined by the scope of the claims.
Claims (30)
1. A low pulsation pump mechanism comprising:
a housing:
a camshaft rotatably mounted about a first axis within said housing;
at least one cam fixed to said camshaft;
at least one cam follower corresponding to said at least one cam and rotatably mounted to one end of a follower arm about an axis parallel to said first axis;
means for biasing said cam follower against said cam;
at least one cross head corresponding to and being fixed to the other end of said follower arm;
a piston rod fixed at one end to said cross head;
means for preventing rotation of said cross head relative to said housing when said cross head and said piston rod undergo linear motion in response to rotation of said camshaft and said cam.
a housing:
a camshaft rotatably mounted about a first axis within said housing;
at least one cam fixed to said camshaft;
at least one cam follower corresponding to said at least one cam and rotatably mounted to one end of a follower arm about an axis parallel to said first axis;
means for biasing said cam follower against said cam;
at least one cross head corresponding to and being fixed to the other end of said follower arm;
a piston rod fixed at one end to said cross head;
means for preventing rotation of said cross head relative to said housing when said cross head and said piston rod undergo linear motion in response to rotation of said camshaft and said cam.
2. A pump mechanism according to claim 1, wherein said cross head is cup-shaped having a bottom closed end and a top open end.
3. A pump mechanism according to claim 2, wherein said bottom closed end is fixed to said other end of said follower arm in generally coaxial alignment.
4. A pump mechanism according to claim 1, wherein said piston rod is fixed at one end to said cross head in generally coaxial alignment.
5. A pump mechanism according to claim 1, wherein said means for biasing said cam follower against said cam comprise a spring.
6. A pump mechanism according to claim 1, wherein said means for preventing rotation of said cross head relative to said housing comprise an extension member fixed with respect to said housing and extending radially inward into an elongated slot on said cross head.
7. A pump mechanism according to claim 6, wherein said extension member comprises a screw.
8. A pump mechanism according to claim 6, wherein said elongated slot extends generally parallel to said piston rod.
9. A pump mechanism according to claim 5, wherein said spring is fixed at one end relative to said housing and is in contact with said cross head at the other end.
10. A pump mechanism according to claim 9, wherein said spring is compressed when said cross head moves away from said camshaft.
11. A pump mechanism according to claim 1, wherein said at least one cam is fixed to said camshaft by at least one key.
12. A pump mechanism according to claim 11, wherein said pump mechanism comprises a plurality of cams fixed to said camshaft.
13. A pump mechanism according to claim 12, wherein said cams are spaced apart from each other by spacers.
14. A pump mechanism according to claim 13, wherein said spacers comprise ring-shaped members fixed about said camshaft.
15. A low pulsation pump comprising:
a housing;
a camshaft rotatably mounted about a first axis within said housing;
at least one cam fixed to said camshaft;
at least one cam follower corresponding to said at least one cam and rotatably mounted to one end of a follower arm about an axis parallel to said first axis;
means for biasing said cam follower against said cam;
at least one cross head corresponding to and being fixed to the other end of said follower arm;
a piston rod fixed at one end to said cross head;
means for preventing rotation of said cross head relative to said housing when said cross head and said piston rod undergo linear motion in response to rotation of said camshaft and said cam at least one cylinder corresponding to each of said at least one cross head having a pump chamber;
an intake and ouptut manifold corresponding to each of said at least one cylinder;
an output check valve corresponding to each of said at least one cylinder permitting flow from the corresponding pumping chamber to the output manifold;
at least one piston corresponding to each of said at least one cylinder and reciprocable within the corresponding cylinder; and a seal carried by each piston for sealingly engaging the corresponding cylinder.
a housing;
a camshaft rotatably mounted about a first axis within said housing;
at least one cam fixed to said camshaft;
at least one cam follower corresponding to said at least one cam and rotatably mounted to one end of a follower arm about an axis parallel to said first axis;
means for biasing said cam follower against said cam;
at least one cross head corresponding to and being fixed to the other end of said follower arm;
a piston rod fixed at one end to said cross head;
means for preventing rotation of said cross head relative to said housing when said cross head and said piston rod undergo linear motion in response to rotation of said camshaft and said cam at least one cylinder corresponding to each of said at least one cross head having a pump chamber;
an intake and ouptut manifold corresponding to each of said at least one cylinder;
an output check valve corresponding to each of said at least one cylinder permitting flow from the corresponding pumping chamber to the output manifold;
at least one piston corresponding to each of said at least one cylinder and reciprocable within the corresponding cylinder; and a seal carried by each piston for sealingly engaging the corresponding cylinder.
16. A pump according to claim 15, wherein said cross head is cup-shaped having a bottom closed end and a top open end.
17. A pump according to claim 16, wherein said bottom closed end is fixed to said other end of said follower arm in generally coaxial alignment.
18. A pump according to claim 15, wherein said piston rod is fixed at one end to said cross head in generally coaxial alignment.
19. A pump according to claim 15, wherein said means for biasing said cam follower against said cam comprise a spring.
20. A pump according to claim 15, wherein said means for preventing rotation of said cross head relative to said housing comprise an extension member fixed with respect to said housing and extending radially inward into an elongated slot on said cross head.
21. A pump according to claim 20, wherein said extension member comprises a screw.
22. A pump according to claim 20, wherein said elongated slot extends generally parallel to said piston rod.
23. A pump according to claim 19, wherein said spring is fixed at one end relative to said housing and is in contact with said cross head at the other end.
24. A pump according to claim 23, wherein said spring is compressed when said cross head moves away from said camshaft.
25. A pump according to claim 15, wherein said at least one cam is fixed to said camshaft by at least one key.
26. A pump according to claim 25, wherein said pump mechanism comprises a plurality of cams fixed to said camshaft.
27. A pump according to claim 26, wherein said cams are spaced apart from each other by spacers.
28. A pump according to claim 27, wherein said spacers comprise ring-shaped members fixed about said camshaft.
29. A pump mechanism according to claim 1, wherein each of said at least one cam is symmetrical in profile.
30. A pump according to claim 15, wherein each of said at least one cam is symmetrical in profile.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US6893593A | 1993-05-28 | 1993-05-28 | |
| US08/068,935 | 1993-05-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2124225A1 true CA2124225A1 (en) | 1994-11-29 |
Family
ID=22085650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2124225 Abandoned CA2124225A1 (en) | 1993-05-28 | 1994-05-25 | Low pulsation pump mechanism and pump |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2124225A1 (en) |
-
1994
- 1994-05-25 CA CA 2124225 patent/CA2124225A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |