US2693150A - Pump - Google Patents

Description

Nv- 2, 1954 s. J. PICKARD' ETAL PUMP 2 Sheets-Sheet l Filed June 13, 1950 Nov. 2, 1954 s, 1 P|KARD ETAL 2,693,150 v PUMP Filed June 13, 195o 2 sheets-sheet 2 35 283433 38 F/G .2 ?\\\`-\\v vyN ,3 'lll/l rum Sydney J. Pickard and Denis E. Ware, London, England, assignors -to Smitlis .lacking Systems Limited, London, England, a British company Application .lune 13, 1951i, Serial No. 167,730

Claims priority, application Great Britain Iluly 29, 1949 6 Claims. (Cl. 1433-174) This invention relates to pumps and its main object is to provide an improved construction of radial plunger pump having any desired number of plungers actuated by a rotating cam, which construction will enable an eiiicient pumping action to be achieved at high pump speed and will eiiiciently trap and collect the pressure uid delivered from each plunger.

According to the invention we provide a pump having a rotary shaft carrying a cam or eccentric for operating one or more plungers reciprocable radially of the shaft, means including resilient packing and a valve member forming a delivery space for each plunger coaxial therewith and at the outer end of the plunger and means including resilient packing forming a manifold gallery around the shaft axis, and connected to one or more of said delivery spaces.

The manifold gallery may be formed between separable parts of a pump body, one part being located within a recess in the other, and sealed on opposite sides by spaced resilient packing rings, and connected to an outlet port in the inner part of the pump body which latter also has an inlet port leading to the plungers. The other part of the pump body may have radial bores corresponding in number to the number of plungers, each containing a liner for guiding a plunger, said lining forming at its outer end a seating for a spring pressed valve member, two spaced packingl rings surrounding the valve member on its outlet side and forming the delivery space between them, and a closure member.

Short d'ucts in the outer pump body may connect these bores to the manifold gallery.

In order that the invention may be more readily understood, reference is made to the accompanying drawings which illustrate diagrammatically and by. way of example two embodimentsthereof, and in which:

Figure l is an axial section of one embodiment of the Pump;

Figure 2 is a cross section on the line li--Il of Figure l;

Figrue 3 is a cross section on the line lll-lll of Figure l;

Figures 4 and 5 are end views in the direction of the arrows A and B respectively of Figure l;

Figure 6 is a perspective viewy on a larger scale of the plunger liner;

Figure 7 is an axial section of another embodiment; and.

Figure 8 is a cross-section on the line Viil-Vlll of Fig. 7.

ln the several views of the drawings, like parts are denoted by like reference characters.

Referring to the embodiment of Figures l to 6, the body of the pump consists of an outer body part 1 and an inner body part 2. The inner body part 2 is mainly located in a recess 3 in one end of the outer body part 1 and is provided with a ilange 4 on its outer end outside the recess 3 whereby the inner part 2 is attached by screws 5 to the outer part 1.

Radially arranged around a central camshaft 6 are three plungers 7 each being reciprocated in its respective radial direction by the lift of a cam 8 integral with or keyed to the camshaft 6. `rThe cam action is applied tangentially to the inner faces 9 of the plungers 7, a freely rotatable bearing ring lil being interposed to assist contact between the cam and the plungers. The cam action is made effective by rotation of the camshaft 6 by any suitable driving means (not shown), connection being eiected at the squared end 11. The'camshaft is effecthe head 22 of the liner 20.

Patented Nov. 2, 1954 tively supported on both sides of the cam in bearings 12 and 13, housed respectively in the outer and inner body parts 1 and 2, thereby adequately supporting the camshaft right up to the point of application of the load, both for journal pressure and end thrust. An oil seal 14 is provided around the camshaft at the drive end of the outer body 1. Duets 15 (Figure l) and 16 (Figure 3) are provided in the body parts 1 and 2, to connect the bearings 12 and 13 to the interior of the pump body to ensure continuous lubrication of the bearings by the fluid (oil) during operation of the pump. The bearing 13 is housed in a bore 17 in the inner body 2 which extends beyond the end of the camshaft 6 to form an oil reservoir 18.

Each of the plungers 7 reciprocates in a bore 19 of a liner 20 which is housed in a radial bore 21 in the outer pump body 1. The liner has an enlarged head 22 which seats on a shoulder 23 formed by a coun'terbore 24 in the body 1 as will later be more fully described. A helical compression spring 25 is arranged externally of the plunger '7 and liner 2@ and bears between shoulders 26 and 27 provided on the two components. The liner is positively held in position in the pump body by a screw down plug 23 in the outer end of the bore 24. The plunger is thus maintained with its inner face 9 in contact with the cam bearing ring 1li. The liner, which is of sufficient length to guide the plunger, has a number of, for example, four, cross holes Sil, about midway along the bore 19, serving to connect the liner bore with the bore 21. These cross holes 30 and the bore 19 serve as iiuid inlet ports.

Within a recess 31 in the top or radially outer face 32 of the liner, at right angles to the bore 19, is seated a disc valve 33 which is loaded by a helical compression spring 34 housed in a recess 35 in the plug 28.

A slot or gap 36 is cut diametrically across the top face 32 of the liner and constitutes a delivery space between the liner and the plug 28. In the recess 31, into which this slot runs, movement of the disc valve 33 is permitted. The slot is effectively isolated against leakage of pressure fluid past the liner or plug by means of two spaced round section rubber or the like seals or packing rings; one of the seals 37 being distorted and trapped within a groove 38 provided around the inner end of the plug 28, and the other seal 39 likewise being trapped within a groove 40 provided in the inner periphery of The outer pump-body 1 supports the radial components, the drive bearing 12, and the shaft oil seal 14 and has a mounting and fixing flange 41 at the drive end. The inner body part 2 has a groove at 42 cut in.

its outer peripheral surface forming a manifold gallery 43 concentrically around the shaft 6. An enlargement of this gallery is formed by grooving, as at 44, the inner surface of the recess 3 in the outer part of the body 1. The gallery 43 is effectively sealed against entry of uid from or exit to the outside of the outer part 1 and from or to the inside of the inner part 2 by means of two spaced round-section rubber or the like seals or packing rings 45, 46, each of said seals being distorted and trapped respectively in grooves 47, 48 formed on either side of the gallery.

Each delivery space 36 of some of the plungers is connected with the manifold gallery d3 by a passage or duct 49 in the outer part 1, and from the manifold gallery a single pressure outlet 50 is provided in the inner part 2.

An independent auxiliary flow of uid is provided for in addition to the main pump flow to the outlet Sil. For this purpose one of the plungers (i. e. the plunger associated with the plug having the extension 28a shown in Figures 2 and 8) and associated parts is isolated from the others by providing an independent pressure outlet in the associated plug 28. The associated delivery space 36 is then isolated from the manifold gallery 43 by simply not drilling the particular connecting hole 49.

Fluid enters the pump at an inlet connection 51 and immediately floods the inside of the pump body which allows all moving parts to be lubricated at all times. When the pump is running, the plungers 7 successively uncover the uid inlet ports 30 when the bottom of the stroke is reached and fluid enters the liner boreA 1-9. As the plunger begins to rise it closes the ports 3i) and increases the pressure of the" iiuid trapped in the liner bore 19'until the spring 34 is overcome and the disc valve 33l lifted. The entrapped fluid is then passed to the delivery space 36. As soon as thel plunger commences its downward stroke thedisc valve re-seats itself andthe fluid is pressure trapped in' the space 36 whence it is transferred via the duct 49y to the gallery 43' and linally to kthe outlet 50.

The embodiment illustrated in- Figures 7 and 8 differs apart from external shape, from that described with reference to Figures l to 6 only in that the pressure fluid inlet 51 and outlet 50" are situated in the outer body part 1 instead of the inner. body part 2. The inlet 51 is-bored radially through the body wally into the camshaft whilst the outlet 50 is bored through the outer body wall into the groove 44 forming the manifold gallery 43. Moreover, this embodiment of pump carries tive plungers 7 equi-spaced radially of the outer pump body l.

p The pump during use will self clear any' air trapped in the pump casing or in` any interior part of the pump, due to the positive action of the plungers'. l

The delivery space 36 and the gallery 43 effectively collects pressure from each of the pumping elements associated therewith irrespective of the number of pumping elements chosen and delivers said pressure without loss to the desired common outlet point 50.

Generally, a flexibility in pressure collection with the provision for alternative outlet points in the pump body, and practical simplicity in the general construction, is provided by the invention together with eiliciency' at high speeds.

We claim:

1. A radial plunger pump comprising a iirst body part having an opening at one end and at least two valve bores having their axes at right angles to said opening, a second body part attached to the tirst body part covering said opening, `said second body part having a first fluid pressure outlet opening therein, a shaft rotatably' mounted' in at least one of said body parts, a cam on said shaft, pump and valve means located in each of said valve bores `and disposed radially of said shaft and operated by said cam to force fluid from the interior of the rst bodypart to delivery spacesv on the radially outer side of said pump and valve means `withinsaid valve bores, at least one connecting duct in said first body part providing communication between at least one of said delivery spacesk and said rst outlet opening', one of said body parts having an inlet duct leading toy the interior of the said body parts,y and further duct means communicating with the interior of at least one of said valve bores to provide a second fluid pressure outlet opening, independent of the said first iluid pres'- sure outlet opening, at the outer end of the pump and valve means associated therewith.

2. A radial plunger pump vcomprising an outer body part having an annular opening at oneend and at least one valve bore having its axis at right angles to said opening, an inner body part attached to the outer body part and having an annular part extending into said recess, a pair of annular packing rings surrounding' said inner body part and forming an annular iluid chamber' between them and between the' annular surface of the said recess and the outer annular surface of the inner body part, a shaft mounted at one end in the outer body part and mounted at its other end in said inner' body part, a cam on said shaft, pump and valve means located .in said valve bore and disposed radially of said shaft and operated by said cam to force -ui'd from the interior bf the outer body part to a delivery space on the radially outer side of said pump and valve means within said valve bore, a connecting duct in said outer body partl providing communication between said delivery space tand said annular uid chamber, one of said body parts having an inlet duct leading to the interior of said outer body part.

3. A radial plunger pump' comprising' an outer body' part having a circular opening at one e'nd and at least three valve` bores having their axes at' right angles vto said opening, an inner body part attached to theA outer body part and having an annular part extending into said recess, said inner body part having a rst outletopening therein, a pair of annular packing rings surrounding said inner body part and forming an annular uid chamber between them and between the circular surface of the said recess and the. outer circular surface.

of the inner body part, a shaft mounted at one end in the outer body part and mounted at its other end in said -inner body part, a cam on said shaft, pump and valve means located in said valve bores and disposed radially of said shaft and operated by said cam to force uid from the interior of the outer body to delivery spaces .0n the radially outer side of said pump and valve means Within. said valve bores, at least two connecting ducts in said outer body part providing communication between at least two of said delivery spaces and said annular iluid. chamber, one of said body parts having an inlet duct leading tol the interior' of said outer body part, and further duct means communicating with at least one of said delivery spaces to provide a second iluid pressure outlet opening, independent of both said rst outlet opening and of said annular iiuid chamber, at the outer end. of one of saidA pump and valve means.

4.. A radial plunger pump comprising a. iirsty body part. having an opening at. one. end and at. least. two valve boreshaving their axes, at. right angles to said opening, a second body part attached to the outer body part covering `said opening, said second body part having a rst fluid pressure outlet opening therein, a shaft rotatably mountedy in at least one of said body parts, a cam on saidl shaft, pump and' valve means located ineach of said valve bores and disposed radially of said' shaft and operated by said cam to force fluid' from the interior of the iirst body part to delivery spaces on the radially outer' side of said pump and' valve means within said valve bores, at least one connecting duct in said first body part providing communication between at least one of said delivery spaces and said rst outlet opening, one of said body parts having an inlet duct leading to the interior of said' outer body part, and means providing a second huid' pressure outlet opening at the outer end of one of said pump and' valve means through the valve bore thereof, each of said pump and valve means connected to said annular fluid chamber comprising an annular shoulder in saidv valve bore, a liner having' a pump cylinder and provided with an enlarged head, a first annular packing ring located between said head and said shoulder, a plug closing the outer end of said bore said plug engaging said liner and pressing it towards said shoulder, and a further annular packing ring surrounding the inner end of said plug and spaced from said first packing ring so as to leave said delivery space between them which is in communication with said connecting duct.

5. A radial plunger pump as claimed in claim 4, wherein the said delivery space is formed by a transverse gap formed inA the outer surface of the enlarged headl of the liner, the valve member comprising a disc freely seating in a recess in said gap.

6. A radial plunger pump comprising a rst body part having an opening at one end and at least two valve bores having their axes at right angles to said opening, a second body part attached to the outer body part covering said opening, said second body part having a uid pressure outlet opening therein, a shaft rotatably mountedV in at least one of said body parts, a cam on said shaft, pump and valve means located in each of said valve bores and disposed radially of said shaft and operated by said cam to force iiuid from the interior of the iirst body part to delivery spaces on the radially outer side of said pump and valve means within said valve bores, at least one connecting duct for each of said valve bores, said connecting ducts being located in said rst body part and providing communication between at least one of said delivery spaces and said iirst outlet opening, one of said body parts having an inlet duct leading to the interior of said outer body part, each of said pump and valve means connected to said annular fluid chamber comprising an annular shoulder in said valve bore, a liner having a pump cylinder and provided with an enlarged head, a first annular packing ring located between said head and said shoulder, a plug closing the outer end of said bore said plug engaging said liner and pressing it towards said shoulder, and a further annular packing ring surrounding the inner end of said plug and spaced from said rst packing ring so as to leave said delivery space between them which is in communication with said connecting duct, the said delivery space being formed by a transverse gap formed in the outer surface of the enlarged head of the linear, and each pump and valve means also including a valve member comprising Number a disc freely seating in a recess in said gap. 2,309,551 2,382,452 References Cited in the le of this patent UNITED STATES PATENTS 5 Number Number Name Date v 316,328 603,805 Wood May 10, 1898 544,077 1,409,786 Sansbury Mar. 14, 1922 580,320 2,219,002 Beeh Oct. 22, 1940 10 Name Date Trapp et a1. Jan. 26, 1943 Svenson Aug. 14, 1945 FOREIGN PATENTS Country Date Germany 1918 France 1922 Great Britain 1946

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