Патент USA US2404835код для вставки
July 3@, 1946.. i R, R FREUND 2,404,835 CROSSHEAD ‘ >Fil-ed Jan. 22, 1945 ,za 35 26 27 .36 3] 33 38 INVENTOR c 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 ~ " > ' ‘ 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. '