Information
-
Patent Grant
-
6257843
-
Patent Number
6,257,843
-
Date Filed
Wednesday, April 26, 200024 years ago
-
Date Issued
Tuesday, July 10, 200122 years ago
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Inventors
-
Original Assignees
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 417 360
- 417 415
- 417 534
- 417 537
- 417 535
- 417 536
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International Classifications
-
Abstract
A self-aligning double-acting simplex plunger pump comprising first and second combined plunger stuffing box and head members or blocks. A manifold is adapted to be abutted against one surface of the blocks and second spaced apart parallel surfaces of the blocks are abutted against the axial end face of a motor. Alignment means on the motor and on the blocks assure proper alignment of the blocks with respect to a piston driven by the motor which reciprocates between the blocks along a longitudinal axis.
Description
BACKGROUND OF THE INVENTION
This invention pertains to an improvement in hydraulic pumps and is generically applicable to double-acting simplex plunger pumps of both the “plunger” and “piston” types.
Pertinent prior art includes U.S. Pat. No. 5,173,039 issued to the present applicant Dec. 22, 1992, and U.S. Pat. No. 5,183,396 issued to James E. Cook & O. Harald S.
Erikson on Feb. 2, 1993. The latter patent discloses an alignment means comprising in part check valves for maintaining alignment of a pair of spaced-apart combined-plunger stuffing box and head members, and the reciprocating plunger or piston.
The present invention provides an improvement over the above-mentioned patents by providing a unique self-aligning system for the combined plunger-stuffing box head members and the plunger. My present invention lends itself to much reduced manufacturing costs, as well as higher reliability and precision alignment of the aforesaid parts.
SUMMARY OF THE INVENTION
The present invention provides an improved alignment system for a double-acting simplex plunger pump. In broad terms, this invention provides alignment means on the motor end face engaging surface of the combined plunger stuffing box and head members, which alignment means co act with additional alignment means in the end face of the drive motor for the pump.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a top left isometric view of the assembled pump
10
comprising in part a drive motor
11
.
FIG. 2
is an isometric exploded view of the apparatus shown in FIG.
1
.
FIG. 3
is a cross section of a combined plunger stuffing box and head member
30
as viewed along section lines
3
—
3
of FIG.
2
.
FIG. 4
is a partial cross section of the axial end of the motor
11
as viewed along section lines
4
—
4
of FIG.
2
.
FIGS. 5 and 6
are, respectively, views of a modification of the invention, which are similar, respectively, to FIGS.
3
and
4
.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to
FIGS. 1 and 2
, the reference numeral
10
is used to designate the entire improved pump comprising, in part, a suitable electric motor
11
, the pump per se being designated by reference numeral
12
. In broad terms, the pump
12
comprises a pair of combined stuffing box and head members
30
and
30
AA, a double-ended piston or plunger
26
, a manifold
50
, and an eccentric drive means
24
,
25
and
27
connected to the piston
26
as will be discussed in more detail below. The combined plunger stuffing box and head member
30
is shown in cross section in
FIG. 3
having two spaced apart parallel surfaces
31
and
32
, respectively designated a pump manifold engaging surface and a motor end face engaging surface. Member
30
further has a plunger receiving recess
26
′ for receiving one end
28
of the piston
26
, the other end
29
of which co-acts with a similar recess in member or block
30
AA; the recess
26
′ has a longitudinal axis AA lying parallel to and between the spaced apart parallel surfaces
31
and
32
. Members or blocks
30
and
30
AA each have a pair of spaced apart parallel bores, i.e., bores
34
and
35
for block
30
and bores
34
′ and
35
′ for block
30
AA. The bores
34
and
35
for block
30
are shown in greater detail in
FIG. 3
; their longitudinal axes are respectively designated BB-
1
and BB-
2
; these axes lie in a plane perpendicular to the longitudinal axis AA. As shown in
FIG. 3
, the bores
34
and
35
extend through the block
30
between and transverse to the spaced apart parallel surfaces
31
and
32
, and are disposed on opposite sides of the longitudinal axis AA.
The blocks
30
and
30
AA further include on the motor end face engaging surface thereof a pair of alignment means. More specifically, for block
30
as shown in
FIGS. 2 and 3
, a pair of alignment means
36
and
37
in the form of bosses, project beyond the plane of the motor end face engaging surface
32
; the bosses
36
and
37
are concentric, respectively, with bores
34
and
35
, and have preselected diameters. The bosses for block
30
AA are identified by reference numerals
36
′ and
37
′.
The motor
11
has an axial end face
14
with a central extending portion which, in turn, has an axial end face
16
. The output shaft of the motor is shown in
FIG. 2
is centered and has a threaded extension
23
adapted to receive and hold a cam member
24
which seats within a bearing
25
, the outer diameter of which is adapted to fit within a crank-engagable recess
27
in the plunger or piston
26
. Thus the assembled cam means
24
and bearing
25
form a crank means for co-acting with the recess
27
for causing reciprocation of the piston
26
upon rotation of the output shaft of the motor
11
.
Two sets of alignment means are provided in the motor end face
14
, the first set being circular recesses
17
and
18
, and the second set being circular recesses
19
and
20
, and shown clearly in FIG.
2
. Recesses
17
and
18
are shown in cross section in
FIG. 4
; recesses
17
-
19
all are of preselected diameters so as to receive, on a tight fit basis, the bosses
36
/
37
and
36
′/
37
′.
Threaded means
17
′ and
18
′ are provided in the motor end face concentric with the recesses
17
and
18
. The axes for threaded means or bores
17
′ and
18
′ are respectively designated as DD-
1
and DD-
2
, the spacing between which is identical to the spacing between bores BB-
1
and BB-
2
of the block
30
.
It will be understood, therefore, that the blocks
30
and
30
AA may be assembled with the motor
11
by having the recesses
36
/
37
and
36
′/
37
′ respectively seated into recesses
18
/
17
and
19
/
20
.
The manifold
50
has a longitudinal axis CC and a bottom flat surface
50
AA adapted to be abutted against the top or pump manifold-engaging surfaces
31
of the first and second members or blocks
30
and
30
AA. The manifold is generally similar to that shown in the above-mentioned patents issued to the applicant, which disclosures are incorporated herein for reference. In general, the manifold has two conduits, the first having two ends
52
and
52
′, and the second having two ends
53
and
53
′, spaced apart on opposite sides and parallel to the axis CC. Importantly, for the present invention, the manifold has a plurality of centrally positioned and spaced apart transverse bores normal to the manifold longitudinal axis CC, i.e., bores
56
,
57
,
58
and
59
, shown clearly in FIG.
2
. The axes of bores
56
-
59
are preselected so as to exactly match with the axes of the threaded bores in the end face of motor
11
. For example, the axes of bores
57
and
58
are spaced apart so as to match exactly the spacing between axes DD-
1
and DD-
2
, and also, the spacing between axes BB-
1
and BB-
2
of the block
30
.
Another transverse bore
54
is provided at one end of manifold
50
, is adapted to receive the shank of a bolt
54
′ which also passes through a bore
45
in the block
30
; the bolt
54
′ has a threaded end for co-acting with a nut
54
″. Each block has valve means which, for block
30
, are identified in
FIG. 2
by reference numerals
42
,
43
, and
44
, which are not germane to this invention, but the details of which are available in the above-mentioned patents.
In assembly, the piston
26
is positioned with its two ends
28
and
29
positioned in the recesses
26
′ in the blocks
30
and
30
AA. The blocks
30
and
30
AA are positioned, as above described, so that the bosses
36
/
37
and
36
′/
37
′ are seated in the recesses
17
-
20
of the motor. The manifold is then positioned so that its bottom flat surface
50
AA is abutting the surface
31
of blocks
30
and
30
AA. Then, a plurality of suitable bolts
58
′ are inserted through bores
56
-
59
, bores
34
/
35
and
34
′/
35
′, and thence threaded into the four threaded recesses
17
′/
18
′ in the motor end face.
The precision positioning of the recesses
17
-
20
in the motor end face, in combination with the precision positioning of the bosses
36
and
37
with respect to the longitudinal axis AA assures that the blocks
30
and
30
AA will be in perfect alignment with the axis AA so as to receive the plunger and also with respect to the output axis of the motor
11
.
FIGS. 5 and 6
show an alternate arrangement so that the alignment means comprises bosses extending out from the axial end face of the motor to co-act with suitable recesses in the block. Thus, in
FIG. 5
a block
130
has bores
134
and
135
corresponding to bores
34
and
35
of FIG.
3
. Recesses
136
and
137
are provided in the motor end face engaging surface
132
.
FIG. 4
shows the corresponding motor end face with bosses
117
and
118
extending axially from the end face
114
.
While the preferred embodiment of the invention has been illustrated, it will be understood that variations may be made by those skilled in the art without departing from the inventive concept. Accordingly, the invention is to be limited only by the scope of the following claims.
Claims
- 1. A double-acting simplex plunger pump comprising:A) first and second unitary combined plunger stuffing box and head members, each member comprising: i) a unitary block having two spaced apart parallel surfaces respectively designated a motor end face engaging surface and a pump manifold engaging surface; ii) a plunger receiving recess in said block for receiving a cylindrically shaped plunger, said recess having a longitudinal axis lying parallel to and between said spaced apart parallel surfaces; iii) a pair of spaced apart parallel bores: a) having longitudinal axes lying in a plane perpendicular to said longitudinal axis of said plunger receiving recess; and b) extending through said block between and transverse to said spaced apart parallel surfaces on opposite sides of said longitudinal axis of said plunger-receiving recess; and iv) a pair of annular bosses projecting from said motor end face engaging surface, said bosses being respectively concentric with said bores, and having a preselected diameter; and B) a manifold having a longitudinal axis, a bottom flat surface adapted to be abutted by said pump manifold engaging surfaces of said first and second members, and a plurality of centrally positioned, spaced apart transverse bores normal to said manifold longitudinal axis; C) a cylindrically shaped plunger, having at two ends thereof, pumping surfaces and a centrally located crank engageable recess; D) a motor having a planar axial end face, and an output shaft rotatable about a shaft axis and extending axially from and perpendicular to said end face; E) crank means on said output shaft; F) two sets of recesses in said motor end face, each of said sets comprising a pair of recesses having a preselected diameter and spaced apart a preselected distance so as to receive a pair of said circular bosses, and said sets being positioned in said motor end face so that when said recesses are engaged by said bosses of said members, the plane defined by the bore axes of one of said members is parallel to the plane defined by the bore axes of the other of said members; G) threaded means in said motor concentric with said recesses; and H) screw members passing through said plurality of transverse bores of said manifold, said parallel bores of said first and second members, and into said threaded means in said motor to thereby hold in assembled relationship said motor, said first and second members with said plunger being positioned in said plunger receiving recesses of said blocks and with said crank means connected to said motor output shaft and to said centrally located crank engageable recess, and said manifold.
- 2. A double-acting simplex plunger pump comprising:A) first and second unitary combined plunger stuffing box and head members, each member comprising: i) a unitary block having two spaced apart parallel surfaces respectively designated a motor end face engaging surface and a pump manifold engaging surface; ii) a plunger receiving recess in said block for receiving a cylindrically shaped plunger, said recess having a longitudinal axis lying parallel to and between said spaced apart parallel surfaces; iii) a pair of spaced apart parallel bores: a) having longitudinal axes lying in a plane perpendicular to said longitudinal axis of said plunger receiving recess; and b) extending through said block between and transverse to said spaced apart parallel surfaces on opposite sides of said longitudinal axis of said plunger-receiving recess; and iv) a pair of spaced apart circular recesses in said motor end face engaging surface concentric respectively with said pair of spaced apart parallel bores and having a preselected diameter; and B) a manifold having a longitudinal axis, a bottom flat surface adapted to be abutted by said pump manifold engaging surfaces of said first and second members, and a plurality of centrally positioned, spaced apart transverse bores normal to said manifold longitudinal axis; C) a cylindrically shaped plunger, having at two ends thereof, pumping surfaces and a centrally located crank engageable recess; D) a motor having a planar axial end face, and an output shaft rotatable about a shaft axis and extending axially from and perpendicular to said end face; E) crank means on said output shaft; F) two sets of bosses projecting normally from said motor end face, each of said sets comprising a pair of bosses having a preselected diameter and spaced apart a preselected distance so as to receive a pair of said circular recesses, and said sets being positioned on said motor end face so that when said recesses are engaged by said bosses, the plane defined by the bore axes of one of said members is parallel to the plane defined by the bore axes of the other of said members; G) threaded means in said motor concentric with said bosses; and H) screw members passing through said plurality of transverse bores of said manifold, said parallel bores of said first and second members, and into said threaded means in said motor to thereby hold in assembled relationship said motor, said first and second members with said plunger being positioned in said plunger receiving recesses of said blocks and with said crank means connected to said motor output shaft and to said centrally located crank engageable recess, and said manifold.
- 3. A double-acting simplex plunger pump comprising:A) first and second combined plunger stuffing box and head members, each member comprising: i) a block having two spaced apart parallel surfaces respective designated a motor end face engaging surface and a pump manifold engaging surface; ii) a plunger receiving recess in said block for receiving a plunger, said recess having a longitudinal axis lying parallel to and between said spaced apart parallel surfaces; iii) a pair of spaced apart parallel bores: a) having longitudinal axes lying in a plane perpendicular to said longitudinal axis of said plunger receiving recess; and b) extending through said block between and transverse to said spaced apart parallel surfaces on opposite sides of said longitudinal axis of said plunger-receiving recess; and iv) a first pair of alignment means on said motor end face engaging surface and being respectively concentric with said bores; and B) a manifold having a longitudinal axis, a bottom flat surface adapted to be abutted by said pump manifold engaging surfaces of said first and second members, and a plurality of centrally positioned, spaced apart transverse bores normal to said manifold longitudinal axis; C) a plunger, having at two ends thereof, pumping surfaces and a crank engageable recess; D) a motor having a planar axial end face, and an output shaft rotatable about a shaft axis and extending axially from and perpendicular to said end face; E) crank means on said output shaft; F) two sets of alignment means in said motor end face, each of said sets comprising a pair of alignment means spaced apart a preselected distance so as to engage a pair of said alignment means or said stuffing box and head members, and said sets being positioned in said motor end face so that when said alignment means are engaged, the plane defined by the bore axes of one of said members is parallel to the plane defined by the bore axes of the other of said members; G) threaded means in said motor concentric with said bores; and H) screw members passing through said plurality of transverse bores of said manifold, said parallel bores of said first and second members, and into said threaded means in said motor to thereby hold in assembled relationship: said motor, said first and second members with said plunger being positioned in said plunger receiving recesses of said blocks and with said crank means connected to said motor output shaft and to said centrally located crank engageable recess, and said manifold.
- 4. The pump of claim 3 wherein said alignment means on said motor end face engaging surfaces of said members comprise a pair of circular bosses and aid alignments means in said motor end face comprise circular recesses.
- 5. The pump of claim 3 wherein said alignment means on said motor end face engaging surfaces of said members comprises circular recesses and said alignment means in said motor end face comprise circular bosses.
US Referenced Citations (4)