US2362525A

US2362525A - Slush pump

Info

Publication number: US2362525A
Application number: US472224A
Authority: US
Inventors: Albert A Ashton
Original assignee: Emsco Derrick and Equipment Co
Current assignee: Emsco Derrick and Equipment Co
Priority date: 1943-01-13
Filing date: 1943-01-13
Publication date: 1944-11-14
Anticipated expiration: 1961-11-14

Description

A. A. ASHTON SLUSH PUMP Nov. 14, 1944.

Filed Jan. 13. 1943 ,Jzf/ef ISA/row Snventor;

(ttorneg Patented Nov. 14, 1944 sLUsH PUMP Albert A. Ashton, Houston, Tex., assgnor to Emsco Derrick & `Equipment Company, Los Angeles, Calif., a corporation of California Application January 13, 1943, Serial No. 472,224

7 Claims.

My invention relates to an improvement in slush pumps of the type employed in the drilling of Wells by rotary method, and relates in particular to a simple, yet eiiective, mud pump construction.

It is an object of the present invention to provide a pump of light weight and simple construetion having as a part thereof a removable crossv head so formed that it may be manufactured at minimum cost and is rigid and self-sustaining when secured in operative position. Through the simplicity of construction achieved therein, this slush pump structure achieves light weight Without sacrice of strength or any other desirable quality.

It is an object of the invention to provide a slush pump having a replaceable unitary cross head guide and means of simple and durable character whereby the cross head guide is vsecured in operative position between the luidand power ends of the pumping device.

It is a further `object of the invention to provide a cross head guide member, as a separate unit for use in a power operative device of this general character, this cross head guide member having a base portion whereby it may be secured to a supporting wall Ain the device, and having as a part thereof sealing meansl for cooperation with the piston rod of the device.'

It is an object of the invention to provide a pump structure, 4or a device of similar character, having a removable and replaceable vcross head guide for attachment 'means at one end thereof, and 'with the other end thereof essentially open, the trame 'work rof 'the pump 4structure having means for cooperative engagement with the attachment-I means at one end of the cross head guide to vestablish alignment of the cross head guide and piston rod as the `cross head Yguide is moved into itsfoperativeposition in the structure.

Further objects 'and advantages of the invention will be brought out in Ithe 'following part of the ispecifcation.

Referring to the drawing, which is -for illustrative purposes only,

Fig. llisaside view or a slush pumpincorporat- I ing my invention, fa portion of `the device 'being vcutawayto showthe removablecross head guide.

The slush pump It shown .in Fig. ,1 has a pump unit I I of double acting .type and a power unit .I2 comprising a rotary member I3 such as a gear ar.. ranged to be driven through a pinion I4. 'I'he gear I3 carries a crank member I5 `arranged to reciprocate a connecting rod I6.

The cylinder `Il 0f the 'unit II has therein a pis-ton I8 adapted tc he reciprocated by a piston rod I9. The pump unit Il andthe power unit I2 are mounted on .a rigid base structure ZIJ, and Within the housing 2l of the power iinit I2 there is a supporting member 22, referred to herein- .after as the supporting wall for a unitary cross .head ,guide 213. y

Referring to Fig. 3, this unitary cross head guide z-a is `essentially a cylinder ria-vine Side Por tions .cut raway to :produce windows -or openings `2J! and leave upper and lower guide bars 25 which `are arcuate in crossfsection and extend in parallel .relation from a circular base 216, this member 26 being sometimes `referred to herein as the head of the cross head ,gu-ide member, since it Iprovides a transverse wall :substantially closing the leftward end of the cross head .guide member, except for the provision ,Otan ripening 21 through which a 'portion of the piston rod passes. This base or head 26 also carries pas a unitalypart of the cross head member packing means or oil stripping means 2B. Eig. 1,101' engagement .with the surface of the piston froci to .prevent oil from beings carried out of .the gear and cross head chamber 29, and likewise to prevent rightward `movement ofthe piston rod Ii9 irom Vcarrying foreign-material :into .the cross head member `23 and into the chamber 29.

rIhe head or base .2@ of zthe unitary Icross head guide Amember 23 has shoulder :means .for -cooperative engagement with the -supporting wall 22 to position :the ,member .2,3 in its proper relation .t0 the piston rod :t9 andthe cross head `3U which is `connected to the rightwa-rd 4end of vthe piston rod 19. This shoulder means comprises la radial face or .shoulder f3! and an annular iace or shoulder 32 carried :by a nat circular extension133 which project-s leftward ,from the 4transverse plane :defined by :the :radial ,face 3l.. From the-circular wall portion 33 there leitwardly @X- tends `a short vcylindric wall. .d eni-ng .a packing chamber -35 which forms fa partei .thesealing or stripping means 2.8,:Shown in Fig. ,1. L

The supporting wall .23 .has fshouldermeans .to cooperate with the Shoulders v3l and .'32 ,0I .the guide member 23, suchshculdenmcans .Comprising the krightward plane-,face-.55. of.the wall 22, this plane `-5.5 being ,perpendicular to .the axis of r the piston rod I9, and an annular face 36 which denes an opening in the supporting wall 22. When the guide member 23 is secured in place by screw means, such as stud bolts 31, the head 26 of the guide member 23 lies in transverse relation to the opening dened by the shoulder 36, and the annular shoulder 32 of the member 23 cooperates with the shoulder 36 to establish coaxial alignment of the guide member 23 and the piston rod I9.

In the form of the invention shown in Fig. 3, the forward ends 38 of the cross head guide bars 25 are tied together by arched Wall segments 39. The connecting rod I6 extends into the open end of the guide member 23 and has thereon an eye 40 which is received in a cavity 4I in the cross head 30, and carries therein a roller bearing 42 for engagement with a bearing pin 43, the ends of which are seated in the side walls 44 of the .cross head 30, as shown in Fig. 2.

A feature of my present invention is that the unitary cross head guide member 23 may be readily machined from a single piece of metal, for example, a casting, by useof simple turning and grinding operation. After it is completed and during its installation and use in the device shown in Fig. l, no adjustment of the guide bars 25 is required, since these guide bars 25 are rigidly supported and machined in fixed relation and are thereafter maintained in this xed relation. Replacement of the unitary guide member 23 when it has become Worn is more economical than the replacement of adjustably secured parts such as employed in ordinary cross head guides, and those difficulties arising from attempted adjustments by unskilled workers are avoided. The removal and replacement of the unitary cross head guide member 23, due to theA simplicity of the supporting and securing means employed therefor, does not require the services of a machinist especially skilled in the adjustment of bearing parts.` A further feature of the invention is that the guide member 23 is supported in such relation to the crank member I that at the end of each rightward reciprocation, a small portion of 'the cross head 30, as indicatedby dotted lines 30 of Fig. 1, will project from the rightward end 0f' the guide member 23 to expose aportion of theupper bearing face of the cross head 30 to the path of oil produced in the chamber 29 by the 'action of the rotating and moving parts which operate therein.A f

- In Fig. 4 I show a cross head guide member 23 which embodies the general features hereinbefore discussed with relation to the guide Vmember 23. It has upper and lower guide bars 25' of arcuate cross section, disposed with relation to the axis of the guide member 23 so as to denne a-n imaginary cylinder. Theforward ends 38' of the guide bars 25 are disclosed without means to tie them together, such as the members 33 shown in Fig. 3. These guide bars 25 are reenforced by ribs 46, which project from a circular base 26 analogous to the base 26 of Fig. 3. In this form of the invention, the piston rod I9 may be reciprocated through use of a cross head A 30' having flattened sides from which the ends of a pin 43 project into engagement with the ends of the forks 41 of a bifurcated connecting rod I6'. The gap 48 between the forks 41 of the connecting rod I6 has a lateral dimension greater than the width of the guide ybars 25.

I claim as my invention:

1.'In a pumping device of the character described, the i combination -of:"a reciprocating pump unit having a piston rod extending therefrom; a supporting wall in transverse relation to the axis of said piston rod and having an opening therein, through which a portion of said piston rod extends; a crank member supported in operative position on the opposite side of said Wall from said pump unit; a unitary cross head guide member having at one end thereof a head through which said piston rod passes and having its other end open, said head having a shoulder to cooperate with said opening in said supporting member for aligning said guide member with said piston rod and there being upper and lower rigid guide bars extending from said head in parallel relation to the axis of said piston rod,y said guide member being removably secured to said supporting wall in a position with its open end projecting toward said crank member and with its head in transverse relation to said opening of said supporting wall; a cross head slidable in said guide member and being connected to said piston rod for reciprocation thereof, and having upper and lower bearing faces to engage said side bars; and a connecting rod connecting said crank member to said cross head.

2. In a pumping device of the character described, the combination of a reciprocating pump unit having a piston rod extending therefrom; a supporting wall in transverse relation to the axis of said piston rod and having an opening therein, through which a portion of said piston rod extends; a crank member supported in operative position on the opposite side of said wall from said pump unit; a unitary cross head guide member having at one end thereof a head through which said piston rod passes and having its other end open, the head of said guide member being removably secured to said supporting Wall and having its open' end projecting toward said crank member and with its head in transverse relation to said opening of said supporting Wall; across head slidable in said guide member and being connected to said piston rod for reciprocation thereof; and a connecting rod connecting said crank member to said cross head.

3. In a pumping device of the character described, the combination of: a reciprocating pump unit having a piston rod extending therefrom; a supporting lwall in transverse relation to the axis of saidpiston rod and having coaxially with said piston rod a circular opening therein, through which a portion of said piston rod extends; a crank member supported in operative position on the opposite side of said wall from said pump unit; a unitary crosshead guide member having a circular base at one end thereof, said guide member being characterized by being of essentially tubular form and having side portions thereof cut away so as to leave fguide bars extending in parallel relation from said base thereof, said base having an annular shoulder to extend into said circular opening of said supporting wall for producing alignment of said guide member with said piston rod, saidv guide member being removably secured to said supporting Wall in a position projecting from said wall toward said crank means; a cross headslidable in said guide member and being connected `to said piston rod for reciprocation thereof and having upper and lower bearing faces to engage said side bars; and a connecting rod connecting said crank member to said cross head. l

4. In a pumping device vof the character described, the combination. ofiz' a. reciprocating tends; a crank member supported in operative position on the opposite side of said wall from said pump unit; a unitary cross head guide member having a circular base at one end thereof, said guide member being characterized by being of essentially tubular formand having side portions thereof cut away so as to leave guide bars extending in parallel relation from said base thereof, said base having an annular shoulder to extend into said circular opening of said supporting wall for producing alignment of said guide member with said piston rod, said guide member being removably secured to said supporting wall in a position projecting from said wall toward said crank means, said guide member also comprising sealing means carried by said base in position to engage said piston rod; a cross head slidable in said guide member and being connected to said piston rod for reciprocation thereof and having upper and lower bearing faces to engage said side bars; and a connecting rod connecting said crank member to said cross head.

5. In an article of manufacture comprising a unitary cross head guide member for use in a pumping device having a piston rod and a cross head reciprocated by' crank means and a casing: a removable open ended base having guide bars extending therefrom in parallel relation and free of said casing, a supporting means in transverse relation to the axis of said piston rod; and means on said base for cooperation with said supporting meansv to hold the same in operative alignment with said piston rod. v

6. In an article of manufacture comprising a unitary cross head guide member for use in a pumping device having a piston rod and a cross head reciprocated by crank means and a casing: a base having guide bars extending therefrom in parallel relation and free of said casing, said guide bars being arcuate in cross section and being positioned so as to define an imaginary cylinder, the ends of said guide bars opposite said base defining an open end for said cross head guide; a support with which said base is removably associated; and sealing means carried by said base for cooperating with said piston rod.

7. In a device of the character described, in combination with a reciprocating pump unit including the piston rod, crank member, and crosshead: a circular plate having a diametrically smaller annular projection and a chamber eX- tended from said projection for a packing unit, said plate provided with a substantially tubular open-ended guide; a support for said plate in transverse relation to the axis of said piston rod, said support having an opening to receive the annular projection thereof; and the plate and support provided with mutually engaging means removably to hold the plate and guide in position.

ALBERT A. AsH'roN.