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Патент USA US2404835

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July 3@, 1946..
i
R, R FREUND
2,404,835
CROSSHEAD
‘
>Fil-ed Jan. 22, 1945
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INVENTOR
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BY
R.R. FREUND
‘
ATTORN
S
‘
Patented July 30, 1946
UNITED ‘STATES PATENT OFFICE
2,404,835
CROSSHEAD,
Robert R. Freund, Phillips, Tex, assignor to
Phillips Petroleum Company, a corporation of
Delaware
Application January 22, 1945, Serial No. 574,015
10 Claims.
(01. 103-1)
1
2
This invention relates to crossheads. In one
of its more speci?c aspects its relates to a pump
Figure 3 is an elevational view of the cover
plate used in the structure of Figure 1.
crosshead carrying a plunger in which the plunger
Figure 4 is a plan view with parts broken away
is removable without disturbing the alignment
of a crosshead and plunger assembly for a duplex
of the crosshead bearings, or causing the bearing, 5 plunger pump embodying same crosshead con
surfaces of the bearing shoe on the crosshead and
struction as shown in Figures 1 to 3 inclusive.
on the slide therefor to touch any surface not
In Figure 1 a pump frame 6 may be provided
touched in normal operation of the pump during
with a bushing l which is generally made of brass
the pumping stroke. In another speci?c aspect
or bronze. for guiding a crosshead operating
it relates to a crosshead assembly in a duplex 10 means which may comprise a driving rod 8.
plunger pump which allows removal of the
Mounted on frame 6 is a pump cylinder 9 in which
plungers without breaking down the crosshead
it is customary to reciprocate a pump plunger 1 l.
While a pump plunger I l is shown, it is obvious
Much difficulty has been experienced in prior
that a piston could be employed instead of
art in repairing pumps because the removal of 15 plunger I l and that this piston could have piston
the plungers is impossible without disaligning the
rings sealing to cylinder 9 without changing the
crosshead or crosshead assembly. In moving the
principle of the present invention and, therefore,
crosshead out of its usual pumping position, it
the word “plunger” as used in the claims is in
is easy for an unskilled worker to scar the bear
tended to cover all usual types of pistons and
ings with resulting wear. The reassembly of the 20 plungers.
crosshead in proper position requires the skill
When the invention is applied to a plunger type
of a millwright. Even a skilled worker ?nds the
pump, as shown, it is customary to have a stu?ing
reassembly and adjustment of the crossheads to
box l2 with the usual gland I 3 sealing between
be a time consuming operation.
the plunger I I and the cylinder 9.
a
The present invention avoids moving the cross
In order to align and guide the plunger II it
heads from their bearing surfaces and reduces
is customary to provide a crosshead. In the
the number of operations necessary to take out
present invention this crosshead I4 is provided
a plunger. In relation to a 3" x 10" Worthing
with a bearing shoe l6 having a bearing surface
ton duplex plunger pump, as an example, the
I‘! which slides in reciprocation on slide I8, as
saving in time amounts to ?ve man-hours per
shown in Figure 2.
plunger which is more than 65% of the time
Crosshead I4 is connected to crosshead oper
needed.
ating rod 8 by means of crosshead end plate It,
One object of the present invention is to facil
studs 2|, nuts 22, screw thread 23 on the end of
itate the repair of a pump.
'
rod 8 and lock nut 26.
Another object is to avoidscarring'the bearing
In order to carry out the objects of the present
surfaces. to save time, to allow the employment
invention, crosshead M is provided with a hole 26
of unskilled workers, and to avoid having to align
which hole has the same axis as the axis of
the crossheads after replacing a plunger.
plunger ll. ‘Hole 26 has a diameter greater than
Another object is to make the plunger readily
any diameter of plunger ll so that plunger ll
removable through the crosshead.
may pass through hole 26 without any di?icult
assembly.
A further object is to provide“ a novel and
useful construction of parts of a pump as shown,
described, and claimed.
Numerous other objects and advantages will
be apparent to those skilled in the art upon
reading the accompanying speci?cation and look
ing at the accompanying drawing.
In the drawing:
manipulation.
A cover plate 21 is provided having a boss 28.
The boss has a sliding ?t in hole 26 and cover
plate 21 is provided with a recess 29 on its surface
' for the reception of the butt end 3| of plunger I I.
As shown in Figure 3, recess 29 and butt end
3| which has a sliding ?t therein are both smaller
than boss 28 which has a sliding ?t in hole 2'6.
Figure 1 is a cross-sectional elevation taken
Easily disengageable means is provided for
through a plunger pump crosshead embodying 50 holding parts I4, 21 and H in assembled relation
the present invention, taken along the line l-l
as shown in Figure l, and this disengageable
of Figure 2.
means may consist of studs 32, nuts 33, and re
Figure 2 is an elevational view with parts in
taining ring 34. However, many other forms of
cross section of the crosshead and plunger as
disengageable clamping means exist in the prior
sembly of Figure 1;
‘
art and any of these old disengageable means, or
2,404,835
3)
wrench inserted between the butt end 3| and
plate 21. When tube 39 is unscrewed it is moved
to the right side of the drawing inside plunger
similarly devised disengageable means, may be
employed to hold parts l4, 2'1, and I l assembled
without departing from the present invention.
II as far as possible.
While not essential in all pumps, it is common
practice to cool the plunger internally with a
cooling ?uid such as water and, therefore, in Fig
Crosshead I4 is then carefully moved to its
extreme pumping position, care being taken not
to move it past the place that it has worn for
itself in bearing surface l8 during normal pump
ure 1 a means has been invented to allow for
such cooling.
The cooling ?uid enters through an inlet pipe
35 which is brought around to connect to an inlet 10'
passage 36 formed in'plate 21. The manner in
which the inlet pipe 35 is supplied with ?uid is
not part of the present invention but the end of
inlet pipe 35 is commonly either connected to a
?exible rubber tubing which allows for movement 15
of the crosshead, or pipe 35 may have its end tele-v
scopingly arranged in a stationary pipe, in which
case a usual stuffing box may be employed.
(These arrangements are not shown.)
Plunger H contains an axial hollow cavity 3?. 20
Plate 21 is provided with an outlet passage 38
into which a ?uid distributing pipe 39 may be
screwed or otherwise fastened for the purpose
of forcing the cooling fluid to circulate down to
ing operation.
Pipes 35,and 42 are disconnected from plate
21 and end plate 21 is moved to the right until
boss 28 has come out of hole 26. Plate 21 is then
lifted upwardly and removed.
Crosshead I4 is then carefully moved on its
shoe l6 along the bearing surface l8 to the ex
treme right-hand position that the crosshead
takes in normal pumping operation as can easily
be seen by the place it has worn for itself in
surface 18. Plunger II is then removed to the
left through hole 26 in crosshead l4 and upwardly
out of the structure shown in Figure 1.
Plunger ll'and stu?ing box l2 may then be
removed without having disturbed the align
ment of the crosshead l4.
.
the far end 4! of plunger H. The disposal of 25
The installation of a new plunger or the return
of plunger II obviously proceeds in an opposite
the cooling ?uid after leaving outlet 38 is im
manner from the above steps of disassembly and,
material to the invention but may be done by
therefore, it is not regarded asnece-ssary to de
,means of pipe 42 which may be of similar con
struction as that described in relation'to pipe
scribe such further operations.
35, The discharge cooling ?uid may be thrown 30
In Figure 4 where there are two crossheads I4, 3
away or may be cooled and recirculated in a
M connected by side rods 43 and nuts l5, the
manner well-known to the art.
operations are performed ?rst on one plunger II
and then on the other plunger I l and at notime
.'
. I
In Figure 2’ side rods '43 are shown in cross
section but it should be understood that when
only one crosshead I4 is employed that side rods
43 may, in some instances, be dispensed with as
unnecessary.
.
In Figure 4 is shown a crosshead assembly gen—
‘is it necessary to spoil the alignment of cross
heads' l4, l4 andside rods 43 nor to otherwise
disassemble the crosshead assembly 44.‘ »
It is obvious that I have provided apparatus for
carrying out the above mentioned objects of the
invention and other objects and having the above
erally designated as 44. This crosshead assembly
is for a duplex plunger pump in which the two 40 mentioned and inherent advantages, " and it ,is
plungers H, ll are oppositely disposed and fit
believed obvious that various changes in shape,
into oppositely directed cylinders, which cylinders
construction, and proportion of parts‘ may’ be
are not shown. The advantage of this construc
tion is to give a double action in that while one
made without departing from the scope of the
present invention, which scope 'is de?ned and
plunger l l is advancing and doing work the other 45 set forth only in the following claims.
plunger is being withdrawn, and on pulling the
Having described my invention,'I claim:
crosshead assembly 44 in the other direction the
1‘. In a duplex plunger pump' having a plurality
other plunger will then do the work.
of‘ cylinders; a crosshead assembly comprising a
In Figure 4 the two crossheads l4, M are con
first crosshead, a second crosshead, and side
nected together by side rods 43 and are held to 50 members securing said crossheads together; a
the side rods by means of shoulders on the side
plunger operated by each said crosshead in co
rods and nuts .15. The other parts being simi
operative‘relationship with one of said cylinders;
larly numbered and similar to those in Figure v1
and means for reciprocating said‘ crosshead as
will not be discussed further.
. 7
Operation
The operation of the pump is similar to all
other plunger pumps during the pumping cycle.
Shoe it travels back and forth on bearing surface
It in normal pumping operation from one ex
treme position to another extreme position and
sembly in pumping; the improver’n'ent‘in which
65 eachsaid crosshead has a hole of'a. diameter
larger than any‘cross section of the plunger op
erated therebypa plate disposed in a position to
cover said hole, and disengageable means securing
said plate to said crosshead in said position and
securing the plunger operated by said crosshead
against said plate ‘and to said crosshead, whereby
‘said disengageable means may ‘be' disengaged to
the distance between these extreme positions is
allow removal of said plate and withdrawal of
of limited extent and isa distance shorter than
said plunger through said hole thereby avoiding
the length of plunger H.
In order to remove plunger ll’ without moving 65 disassembly of said crosshead assembly when re
surface i7 away from any position on bearing it
2. The improvement of claim 1 in which the
beyond the two extreme positions it takes .in
plunger is hollow and ?uid cooled internally, said
normal pumping operation, the following se
.plate having an inlet passage and an outlet pas
quence of operations may be employed.
Nuts 22 are unscrewed from studs 21 and plate 70 sage for the cooling ?uid, means to supply cool
ing ?uid to said inlet passage, said inlet and out
59 is pushed toward the left-hand side of the
letpassages communicating with the hollow in
drawing. Nuts 33 and studs 32 are removed and
terior of said plunger, and a ?uid distributing
vplunger H. and ring 34 are pushed .to'the right
tube detachably secured to said cover plate and
side of the drawing as far as possible. If tube 39
is present it may be easily unscrewed with a 75 forming a continuation of one of said passages
moving
a
plunger.
»
‘
a
I
~
"
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2,404,835
5
6
whereby circulation of said ?uid inside said
plunger is improved at the end of said plunger
the crosshead having an opening larger than the
farthest from said cover plate.
3. The improvement of claim 1 in which the
plunger is hollow and ?uid cooled internally, said
ing passage of said plunger through said opening,
cross sectional area of the plunger, a plate block
and
said
said
and
and
plate having an inlet passage and an outlet pas~
sage for the cooling ?uid and means to supply
cooling ?uid to said inlet passage, said inlet and
disengageable means securing said plate to
crosshead and said plunger to said plate and
crosshead in said cooperative relationship
disengageable to allow removal of said plate
passage of said plunger through said open
ing.
outlet passages communicating with the hollow
8. The improvement of claim 7 in which the
interior of said plunger.
10
plunger is hollow and ?uid cooled internally, said
4. In a plunger pump having a cylinder; a cross
plate having an inlet passage and an outlet pas
head, a plunger operated by said crosshead in
sage for the cooling ?uid, means to supply cool
ing ?uid to said inlet passage, said inlet and out
cooperative relationship with said cylinder; and
means for reciprocating said crosshead in pump
ing; the improvement ‘in which said crosshead 16 let passages communicating with the hollow in
has a hole of a diameter larger than any cross
section of the plunger operated thereby, a plate
disposed in a position to cover said hole, and dis
engageable means securing said plate to said cross
head in said position and securing the plunger 20
operated by said crosshead against said plate and
to said crosshead, whereby said disengageable
means may be disengaged to allow removal of
said plate and withdrawal of said plunger through
said hole thereby avoiding movement of said
crosshead beyond the normal extreme positions
of said crosshead due to said reciprocation in
pumping.
'
,
terior of said plunger, and a ?uid distributing
tube detachably secured to said cover plate and
forming a continuation of one of said passages
whereby circulation of said ?uid inside said plung
er is improved at the end of said plunger farthest
from said cover plate.
'
-
9. The improvement of claim 7 in which the
plunger is hollow and ?uid cooled internally, said
plate having an inlet passage and an outlet pas
sage for the cooling ?uid and means to supply
25
cooling fluid to said inlet passage, said inlet and 7
outlet passages communicating with the hollow
interior of said plunger.
10. In a pump the combination comprising a
5. The improvement of claim 4 in which the
plunger is hollow and ?uid cooled internally, said 30 crosshead, a cylinder, a plunger in cooperative
relationship with the crosshead and the cylinder,
plate having an inlet passage and an outlet pas
a bearing having a bearing surface of limited
sage for the cooling ?uid, means to supply cool
extent secured to said cylinder, said crosshead
ing ?uid to said inlet passage, said inlet and out
having a bearing shoe slidable on said bearing
let passages communicating ‘with the hollow in
surface between two extreme positions in normal
terior of said plunger, and a fluid distributing
operation of said pump while said cooperative
tube detachably secured to said cover plate and
relationship is maintained, the crosshead hav
forming a continuation of one of said passages
ing an opening larger than the cross sectional
whereby circulation of said ?uid inside said plung
area of the plunger, a plate blocking passage of
er is improved at the end of said plunger farthest
from said cover plate.
- 40
said plunger through said opening, and disen
gageable means securing said plate to said cross
head and said plunger to said plate and said
crosshead in said cooperative relationship and
disengageable to allow removal of said plate and
cooling ?uid to said inlet passage, said inlet and 45 passage of said plunger through said opening
without separating said shoe from said bearing
outlet passages communicating with the hollow
surface nor moving said crosshead beyond either
interior of said plunger.
6. The improvement of claim 4 in which the
plunger is hollow and ?uid cooled internally, said
plate having an inlet passage and an outlet pas
sage for the cooling ?uid and means to supply
'7. In a pump the combination comprising a
crosshead, a cylinder, a plunger in cooperative
relationship with the crosshead and the cylinder, 60
of said two extreme positions.
ROBERT R. FREUND.
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