US1322810A - Rotary pump with adjustable gate - Google Patents

Description

L. F. moonv.

ROTARX PUMP WITH ADJUSTABLE GATE. APPLICATION mm JUNE 10. I919.

Patented Nov. 25, 1919.

4 SHEETS-SHEET fl- L. F. MOODY.

ROTARY PUMP WIIH ADJUSTABLE GATE.

APPLICATION man JUNE 10. I919.

Patented. Nov. 25, 1919.

4 SHEETS-SHEET 2.

54 5 F iglt L. F. MOODY.

ROTARY PUMP WITH ADJUSTABLE GATE.

APPLICATION FILED JUNE 10, I919.

Patented Nov. 25, 1919.

Lz mo 4 SHEETS-SHEET 3- L. F. MUDDY.

ROTARY PUMP WITH ADJUSTABLE GATE.

APPLICATION FILED JUNE 10. 1919.

Lfi fil Q0 Patented Nov. 25, 1919.-

4 SHEETS-SHEET 4.

a' err-1 no'rnny PUMP WITH ADJUSTABLE GATE.

Specification of Letters Patent.

Patented Nov. 25, 1919.

Application filed June 10, 1919. Serial No. 303,132.

To all whom it may concern:

Be it known that I, Lnwrs FERRY MooDY, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and 'State of Pennsylvania, have invented certain new and useful Improvements in Rotary Pumps with Adjustable Gates, of which the following is a specification.

' The principal objects of my invention are to provide new and improved means for controlling the performance of a rotary hydraulic pump and to provide a method of moving Water against an opposing head for which such a pump may be employed. .Another object of my invention is the mainte nance of high efliciency in a rotary hydraulic pump when the pump is operated at "arious rates of discharge, that is, the improvement of the efficiency of the pump when discharging quantities of water greater or less than the normal or designed quantity. Still another object is the provision of a regulating or controlling valve for a pump which can be conveniently and quickly op.- erated by means of fluid pressure. All these objects and others will be appreciated upon consideration of a limited number of specific examples of practice under my invention which are disclosed in the fol lowing specification and claims taken with the accompanying drawings. It will be understood that modifications may be made within the scope of my invention.

Referring to the drawings,

Figure 1 is a vertical section of a vertical shaft pump embodying my invention.

Fig. 1 shows a detail of Fig. 1.

Fig. 2 is an axial section of a horizontal shaft pump illustrating a different type of pump and gate control means and Fig. 3 is an axial section of a different type of pump embodying my invention.

. Referring to Fig.1, the power shaft 11 in the bearing '12 and passing through the packing box 13 carries the impeller 14 with the vanes 15 and shroud ring 16. The inflow'conduit '32 leads up vertically to the impeller, which discharges through the diffuser 19 into the spiralchamber 18 ending in the flange 17, which may be attached to anyF suitable conduit or receiving tank.

he stationary pump frame 33 supports the spiral casing '18 and an annular cylinder 23, of which the outside wall is 20, the inside wall 21 and the annular head 22. Within this annular cylinder 23 is a corresponding plunger 24 with the annular head 25 formng the upper face of the diffuser 19. This plunger 1s shown in Fig. 1 in the position corresponding to the operation of the pump at full discharge. For reduced output of the pump, the plunger 24 may be lowered as will be explained more in detail presently. The lnner corner of the head 25 is slightly rounded off at 26 to facilitate such a-part gate operation of the device.

The plunger 24 is moved by fluid pressure admitted to the cylinder 23 through either pipe 29 or 30. Attached to the plunger 24 is' a restoring rod 40, which goes through a yalve chamber 39 (Fig. 1 in the valve cas ing 41 having the cylindrical liner 42. The valve member 43 has the pistons 44 and 45 adapted to control the valve ports as shown in the drawing. This valve member 43 extends outside of the valve casing 41 at 46, where it rotatably carries hand wheel 51.

held by a key 48 in slots 47 and 49, so that rotation of hand wheel 51 adjusts valve 43 relatively to rod 40 and this adjustment is indicated on scale 58 on extension 57 passing throughsleeve 54 and cap 55 and having a tigglt sliding fit in the former by packing 5 The adjustment of the gate 24 corresponding to the setting of hand wheel 51 on scale 58 will automatically be maintained by the restoring device for example as follows: Should the gate 24 move down from its adjusted position valve member 43 will also be moved down admitting pressure from pipe 27 and port 60 to pipe 30 and connecting pipe 29 to exhaust 61, 28 to raise the gate; conversely upward movement of the gate from adjusted position will connect pipe 29 to the pressure fluid and pipe 30 to the exhaust to lower the gate back to set position. The space below 44 is connected with 61 by a passage not shown. The hand wheel '51 also serves to control the gate movements, for instance to close the gate 24 the hand wheel 51 will be rotated counterclockwise, thus causing the valve member 43 to move up relatively to the rod 40. Such movement will connect pressure pipe 27 with the ports uncovered by valve member 45 and admit the pressure fluid through the conduit 29 to close the gate. The consequent movement of the restoring rod 40 will close the port under the valve member 45 and the In full gate operation the parts will have.

the adjustment shown in Fig. 1.- The impeller vanes 15 will receive the water from the inflow conduit 32, drive it with rela-.

tively high velocity into the difluser 19 and thence with reduced velocity into the spiral collector 18, where the remainder of its velocity energy will be converted with as little loss as possible, into static head. If it is desired to reduce the quantity of water being pumped, the plunger will be lowered to a proper degree under the control of the hand wheel 51.

The embodiment of my invention shown in Fig. 2 differs from that of Fig. 1 in that the pump axis is horizontal instead of vertical and the lunger locationis on the intake-side of tiie impeller instead of on the side opposite to the intake. The plunger 24 m the Fig. 2 pump is controlled by by draulic pressure supplied through the pipe 27 and regulated by the four-way valve 31. This valve is shown in Fig. 2 in position to move the plunger 21 to the left by admitting pressure fluid from the pipe 27 throu h the pipe 30 to the right end of the cylin or 23. At the same time that the pressure is ad- 'mitted to the right end, the pipe 29 from the other end is connected by the valve 31 to the exhaust conduit 28. When the plunger 24 has been moved to any desired point, an eighth turn of the valve 31 either way will close all the ports and hold that stage of adjustment. To move the plunger 24: to the right the valve 31 will be given a quarter turn from the position shown in Fig. 1, so as to connect the pressure pipe 27 to the conduit 29 at the left end of the cylinder 23 and also to connect the exhaust conduit 28 with the pipe 30 at the right end of the cylinder 23.

In the embodiment of my invention shown in 3, the lunger gate is on the lower side of the di user.instead of on the upper side as shown in Fig. 1. The impeller vanes 15 carry no shroud ring. The direction of flow through the diffuser 19 is not in a common plane, but is conical as will readily be seen by comparing Fig. 3 with Fig. 1. The plunger 24 has its inside cylindrical wall on the inner side of the inside cylinder wall 21 so that as the water flows around the corner 26, it is never sharply deflected and no pocket can be formed by the rounded corner 26 passing within any part of the casing.

In Fig. 3, the {gate 24 is shown at normal full gate position by the full lines, but it is designed for operation at overgate adjustment, if desired, as indicated by the dotted lines. In this case, there will be an annular clearance space around the outer ends of the impeller vanes 15, but the water will be dragged along through this annular clearance space by the stream nearer the axis which is moved in a more positive manner by the impeller vanes 15. The action will be somewhat on the prinei 1a of the ejector by which one stream of uid is caused to pick up and impart its motion to another body of fluid. The operation under over-gate conditions as described maybe advantageous when it is desired to move an unusually large volume of water at some what less than the usual head, and when-the maintenance of'the full normal efliciency of operation is not important under such unusual conditions. i i

Itwill be seen that I h'aveprovided a pump in accordance with my invention,

which will operate to give widely different. discharge rates without undue sacrifice 'of efliciency. When the plunger gate is wide open, the water is delivered from the mar-' gin of the impeller into' the diffuser space 19 with a considerable velocity energy. When the plunger gate is nearly closed, the impeller forces the water through the comparatively narrow difi'user with a velocity as high as before, but in diminished volume. The Water flows around the rounded corner 26 of the plunger head 25 with smooth lines of flow in a manner somewhat similar to the flow of a jet from an orifice. The diminished output of the pump under part-gate conditions means a corresepondingly dimin-' ished requirement of power, because the re? duced output is obtained without throttling in such a way as to set up eddies or otherwise occasion loss of energy.

An advantage of the arrangement of this invention is the provision of a well formed difi'usion space at alldegrees of openin of the plunger gate, so that in all positlons there will be ample space for a gradual reduction of velocity and conversion of velocity head into pressure head. Moreover, as the opening is made smaller, the loss which would otherwise be caused by sudden enlargement at the outer periphery of the plunger is offset by the relatively greater efliciency of difi'usion due to the *greater ratio of length to' width of the difi'usion space. For when the plunger is partially closed, the length of passage traversed by the water is much greater in proportion to its width than when the plunger is open, and the conversion of velocity head into pressure head will be more efliciently effected in the part-gate position. Therefore in.

the outer periphery of the plunger, which s the outer periphery of the diifuser, and

enters the spiral casing, its velocity is greatly reduced both in its radial and Whirl components. Thus under conditions of reduced discharge the loss due to the casing being too large in cross section to suit the Whirl component Will be largely overcome by the conversion of Whirl component w1thin the difi'usion space.

Another advantage of my invention the simplicity and ruggedness of the structure, 10 especially as compared with wicket gates or adjustable guide vanes, which lnvolve considerable mechanism and are not practicable for providing an adjustable diffusion space.

I claim 1. In a rotary pump, an impeller, a diffuser around said impeller with substan tially parallel annular Walls, and a conduit around said difl'user, one of said walls of the diffuser being movable to or from the other and relatively to the adjacent edge of the discharge space of said impeller to adjust the capacity of the pump.

2. In a rotary pump a rotary impeller,

a plunger gate surrounding said impeller and displaceable axially with relation to the edge of the discharge space of said impeller to adjust the capacity of the pump and means to move said gate by fluid pressure.

3. In a rotary pump, a plunger gate displaceable axially to adjust the capacity of the pump, a cylinder and coacting piston, one fixed and the other connected with said gate, and means at each end-of said cylinder to introduce fluid pressure between said piston and the corresponding head of the cylinder to move said gate in either direction.

4:. In a rotary, pump, an impeller having passages of constant cross-section, and a gate close to and coaxial with theimpeller but separate therefrom and movable axially to adjust the cross section at said gate of the stream through the pump.

5. In a rotary pump, an impeller having passages of constant cross-section, a diffuser adjacent thereto, and means to adjust the difi'user by varying its cross section across the lines of flow, thereby to adjust the capacity of the pump.

6. In a rotary pump, an impeller, and a coaxial gate closely adjacent to the impeller and adapted to be moved relatively to the adjacent edge of the discharge space of said impeller.

7. The method of adjusting the capacity of a rotary pump having a difluser and impeller which consists in varying the cross section of the diffuser across the lines of flow therethrough While maintaining the cross section of the passages Within the impeller unchanged.

8. The method of adjusting the capacity of a rotary pump which consists in cutting ofi' to a'suitable degree the cross section of the stream across the flow lines, at points close to the impeller on its delivery side without changing the cross sectional area of the passages Within the impeller.

9. In a rotary pump, an impeller having passages of constant axial Width, a difi'user adjac'ent' thereto, and means to vary the axial Width of the diffuser to adjust its cross section across the lines of flow, thereby to adjust the capacity of the pump.

10. In a rotary pump, an impeller, and a coaxial gate closely adjacent to the impeller and displaceable in an axial direction relatively to the adjacent edge of the discharge space of said impeller to adjust the capacity of the pump.

11. The method of adjusting the capacity of a rotary pump having an impeller and a diffuser which consists in varying the cross section of the difluser across the lines of flow therethrough without changing the cross section of the passages Within the impeller.

12. The method of adjusting the output of a rotary pump having a diffuser Withoutsacrifice of efliciency Which consists in varying the capacity of the diffuser by relative movement of its guiding surfaces Without changing the cross sectional area of the passages within the impeller.

13. The method of adjusting the capacity of a rotary pump having an annular outward flow diffuser surrounding the impeller which consists in varying the width of the diffuser in an axial direction without changing the cross sectional area of the passages within the impeller.

14. In a rotary pump, an impeller, a diffuser around said impeller with substantially parallel annular walls and a spiral conduit around said diffuser, one of said Walls of the difl'user being movable to or from the other and relatively to the adjacent edge of the discharge space of said impeller to adjust the capacity of the pump. 15. In a rotary pump, an impeller, a diffuser around said impeller with substantially parallel annular walls, and a conduit around said diffuser, one of said walls of the, diffuser being movable to or from the other and relatively to the adjacent edge of the discharge space of said impeller to adjust the capacity of the pump, said movable wall having its edge toward the impeller rounded off to give smooth lines of flow around it.

16. In a rotary pump, an impeller, a diffuser around said impeller, an annular cylinder adjacent .to said difluser, and a corresponding piston therein, one Wall of said difiuser being connected to said piston by a cylindrical barrel.

17. In a rotary pump, an impeller, a diffuser around said impeller, an annular cylall inder adjacent to said diflfuser, a correspending piston therein, one wall of said difluser being carried by said piston, pressure supplyconduits to the ends of said cylinder, and valve means to move said piston either way or hold it at any desired adjustment entirely by the admission of fi-uid pressure to either side ofgthe piston.

18. In a rotary pump,- an impeller, a diffuser, around said impeller, an annular cylinder gate moved by fluid-pressure adjacent to said 'difi'user, a corresponding piston therein, one wall of said diffuser being carried by said piston, pressure supply conduits to the ends of said cylinder, and valve means to move said cylinder either way and to automatically maintain it at any,

desired adjustment or restore it if displaced.

19. In a pump the combination with guidin walls forming a passage directing the flow of fluid, of impeller vanes extending of fluid,-of impeller vanes extending only partly across said passage, said walls being formed to cause the flow through the remainder ofthe passage to'be drawnalong by the vanesand said gate being movable to direct, substantially all of the fluid 'throu h saidvanes.

21. n a pump the combination withan impeller and inlet and discharge passages, of a plunger gate in said discharge adjustable relatively to the adjacent edge of the discharge space of said impeller and'having anormal position for full load, said parts being formed to permit said gate to be moved! to giveeither greater or less discharge than that for said normal position.

22. In arotary pump, an impeller, a diffuser around said 1mpeller,'-an annular cylinder adjacent to said difi'user, a corresponding piston therein, one wall of said difluser being carried by said piston, pressure supply conduits to the 'ends of said cylinder, and valve meansto move said cylinder either way and to automatically maintain it at any desired adjustment or restore it if displaced.

23. The method of regulating the capacity of a rotary pump having an impeller and a discharge opening therefrom, com-" prising varying the cross section of said discharge opening adjacent said impeller with relation to the cross section of the passages of said impeller.

LEWIS FERRY MOODY.

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