US2180378A - Pump - Google Patents

Description

NOV. 21,1939. E. wHfr 2,180,378

PUMP

Filed Jan. 29, 1938 3 Sheets-Sheet 1 A TTORNEYS.

Nov. 21, 1939.

J. E. WHITFIELD PUMP Filed Jan. 29, 1938 s SheerLs-Sheet 2 Nov. 21, 1939. J, E, WHITFIELD PUMP Filed Jan. 29, 1938 3 Sheets-Sheet 5 Rim ATTORNEYS."

Patented Nov. 21, 1939 UNITED STATES PATENT oFnce PUMIP Joseph E. Whitfield, Grove City, Pa.

Application January 29, 1938, Serial No. 187,691

' 7 Claims. (01. 103-425) Pumps have been made including a case and rotor in the case and rotating gates operating with relation to the rotor to draw in and discharge fluid as the rotor and gates rotate. Most of such structures provide an inlet or discharge through the rotor. The present invention is designed to avoid the objections incident to using the rotor as a passage for fluid, and provides a structure in which the ports leading to the space swept by the rotor are entirely in the case, thus making a cheaper form of rotor, obviating the objections of carrying the port passages past the bearings and placing the ports at a more advantageous position for emcient operation.

In forming the pump the rotor is preferably provided with three driving abutments operating through two gates, the gates being provided with opposing grooves for receiving and passing the abutment. The three abutments operating through two gates gives a continuous discharge abutment permits of a greater radial depth of chamber and consequently an apparatus of greater capacity with the same size of machine. Thus in the present invention there is given a'continuity of movement of fluid with a very great capacity for a given size of apparatus. While the structure is particularly desirable as an air blower a variation of the device may be used for moving liquids. One of the desirable features of the inventionv is the structure which permits of unit assemblies of the valve mechanism and the rotor in the case. This is desirable not only by way of servicing but in the ease of original assembly. Features and details of the invention will appear ,from the specification and claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings as follows:

Fig. 1 shows a central vertical section throug the rotor on the line 2-2 in Fig. 3.

Fig. 2 is a similar section enlarged and with the parts partly assembled.

Fig. 3 is a section on the line 33 in Fig. 1.

Fig. 4 is a section on the line 4-4 in Fig. 1.

of a rotor showing the valve closing surfaces and rotor abutment.

Fig. 6 a similar view but with a variation of abutment adapting the device to pumping liq- All figures except Figure 6 exemplify the in- 1 0 vention as a blower.

Acase I has a compression or working chamber 2 with a peripheral'wall 3. This peripheral wall has the inlet ports 4, and 5 .and the discharge ports 6 and l. The case is provided with a base 16 la and contains the inlet and outlet from the blower. By varying the-porting or passages in the base these may be shifted to satisfy whatever conditions may be required. The base has the inlet chamber 8 with an inlet opening 9. The 20 chamber 8has a passage H] which communicates with a passage II in the case. The passages l0 chamber M which has the discharge opening [5. 30 I It communicates with the passage !8. The passage l8 leads from the port 6.. The passage [6 and the passage I! lead from the port I. The passage It extends half way from front to rear, a partition dividing it from the passage 10; The 35 passage ll extends --from front to rear in the portion adjacent to the port I. These passages l6 and 11 form a direct connection between the chamber It and the port I. l

A rotor I9 is arranged in the chamber 2 and 40 has abutments Illa which form a closure with the peripheral surfaces 3a of the chamber. These abutments pass the-gates 20 which gates rotate in. gate chambers 2a in the case, the gates being adjacent to the ports, in fact separating 45 the inlet and outlet ports 5 and B, and 4 and I respectively. The gates have the grooves 2| which are adapted to receive the abutments Mia and are rotated so. as to permit the passage of the abutments past the gate, the grooves and so" abutments continuing a closure of the abutment as it passes through the gate.

Preferably the rotors are provided with three abutments as shown, and two grooves 2| are v preferably provided in the. gates. As heretofore indicated, this provides a continuous inflow and outflow of fluid. There is a discharge from one or the other of the chambers at all times and an intake to one or the other chamber at all times. The grooves of the-gates are of a depth making the bottom walls of the groove closely adjacent, consequently giving the greatest possible dimension to the abutments. It will be understood that the pitch line of the driving gears (hereinafter described) corresponds to the rolling surfaces of the rotor and the gates. By making the abutments of greater dimension, the depth of the chambers is made greater, and consequenty the capacity of the apparatus is increased, it being understood that a full volume of the annular chamber is swept and discharged by each abutment with each rotation of the rotor.

Each gate has an annular flange 22 at each end. As shown, one flange is formed in a detachable end 22a for convenience of machining, this being secured to the valve by screws 22b. The end of the valve has the cut-away portion 22c to receive projections 22d on the detachable end. A trunnion 23 extends from the detachable end of the gate into a roller bearing assembly 26 which is mounted in an opening 21 formed in a closure plate 25. This assembly includes a seal ring 26a in which a seal 26b is arranged. The opposite end of the gate has a trunnion 28 which extends into a ball bearing assembly 29, the assembly including a ring 29a having a seal 29b. This assembly is inserted into openings 30 in the side wall of the case I. A gear 3| is fixed on the trunnion 28 secured by a nut 28a and meshes with a gear 32. The gear 32 is fixed on a shaft 33 on which the rotor is mounted. It is locked by pins 32a which extend through. the gear into a flange 33a. on the shaft 33. The shaft 33 is mounted at the closed end of the case in a ball bearing assembly 34. The ball bearing assembly is inserted into an opening 35 in the side wall lb of the case, The assembly includes a seal 34a in a seal ring 34b. The ring 34b abuts a removable ring 340 secured to the side wall of the case and overlapping the ring 3417. The opposite end of the shaft extends into a roller bearing assembly 36 which assembly is carried by a ring- 3611 which ring is inserted into an opening 31 in the closure plate 25. A seal 35b is also arranged in the opening and carries a seal 360, the seal ring being secured to the ring 36a. The gears 3| and 32 have a two to three ratio so that the gates make three revolutions to two of the rotor.

A cover plate 38 is provided over the. closing ring 25 and screws 38a extend through the cover plate and the ring 25 into the case. A cover plate 39 covers the gears and is secured to the case by screws 39a. Shields 40 are provided in the plate 39 encircling the gear 32. This assures the return of the lubricant thrown oifby the gears to the gears when the blower is running at high speed.

It will be noted that the rotor bores and the gate bores may be readily fabricated and the case may be arranged to receive the bearings at one end of the gates and the rotor. The gates with thebearings and the gear at one end may be completely assembled and the trunnions at the opposite end will pass into the rollers at the left end of the gate cavity (see Fig. 2) so that this entire gate assembly may' be readily withdrawn and replaced. In like manner the entire rotor with the abutments may be withdrawn toward the left when the closure plate 25 is removed. In reassembling the securing of the gear 82 to the Fig. 2 the roller bearings at the left are shown as detached from the closure plate it is not necessary to withdraw these rings from their openings when the closure plate is removed in that the roller bearings will stay in place in their cages and receive the trunnions. Likewise the plate 340 which is shown removed need not be removed from the case as the rotor is withdrawn. The ball bearings at one end lock the rotor and gates againstend movement.

The flanges 22 on the gates make a closure at the ends of the gates more certain." Where the device is arranged as a blower with the abutment and gate having the curve shown in Fig. 5 the closure surfaces of the abutment follow along the gate and provide plural closure lines throughout portions of the movement. There is, however, a slight trapping, or compressure of air in this movement which prevents the use of this more desirable closure for air being also used for liquid. In order to give the proper clearance for liquid the abutment has spaces 4| which give the proper clearance for the liquid.

It will be noted thatthe tips of adjacent abutments just span the distance between two ports so as to give the greatest capacity. The three abutment structure readily lends itself as to this,

particularly with valves of proper size, the valve spaces equalling each one half of this space be-- tween the abutments. The load is carried entirely by the rotor so that there is no particular load on the gears, the gears simply timing the valves or gates. By placing the ports in the peripheral surfaces rather than through the gates, or through the rotor, large capacities can be given so that the heat may be readily dissipated and the port losses may be very much reduced. By utilizing the three abutments with two gates the largest capacity with few parts is attained. By arranging the trunnions directly on the ends of the gates the gate grooves may be carried very close together, thus permitting of large radial dimensions of abutments and, therefore, greater capacity,

This application is in part a continuation of my application, Serial Number 130,040.

What I claim as new is:

1-. In an apparatus of the character described, the combination of a case having a base; a rotor chamber with an outer cylindrical chamber wall; a rotor mounted in the chamber, the rotor being spaced from the walls of the chamber forming an enclosed space; three driving abutments on the rotor closing and sweeping the walls of the chamber; two rotating gates across the space, one at the top and one at the bottom, said gates by their rotation passing the abutments past the gates, the peripheral chamber walls being provided with a pair of ports for each gate, said ports accommodating the major portion of the fluid passing through the apparatus; an inlet and a discharge passage leading to and from the upper ports from the base along the outer peripheral of the cylindrical wall; the passages extending axially over the major portion of said wall and a cross inlet and discharge passage connecting the inlet and discharge ports at the bottom with the inlet and discharge passages respectively.

2. In a device of the character described, the combination of a case comprising rotor and gate bores; a rotor in the rotor bore spaced from the walls thereof, said rotor having a driving abutment sweeping and closing the space; a bearing for the rotor; a gate in the gate bore having a groove receiving and passing the abutment through the gate; a bearing for the gate; means carrying the bearing for the rotor; and gears maintaining the timing of the rotor and gate, said rotor and its bearing forming an assembly unit so related to the rotor bore as to permit the removal of the rotor and its bearing as a unit from the case without removal of the gate and its bearing.

3. In a device of the character described, the combination of a case comprising rotor and gate bores; a rotor in the 'rotor bore spaced from the walls thereof, said rotor having a driving abutment sweeping and closing the space; a bearing for the rotor; a gate in the gate bore having a groove receiving and passing the abutment through the gate; a bearing for the gate; means carrying the bearings for the rotor; and gears maintaining the timing of the rotor and gate, said rotor and its bearing forming an assembly unit so related to the rotor bore as to permit the assembly and'removal'of the rotor and its bearing as a unit from the case independently of the presence or absence of the gate and its bearing in the assembly. 7

4. In a device of the character described, the combination of a case comprising a cylindrical rotor bore and a cylindrical gate bore; a rotor in the rotor bore spaced from the walls thereof, said rotor having a driving abutment sweeping and closing the space; a gate in the gate bore having a groove receiving and passing the abutment through the gate; a bearing for the gate; means carrying the bearing; gears maintaining the timing of the rotor and gate, said gate, bearing and carrying means forming an assembly unit so related to the gate bore as to permit the assembly of the gate, bearing for the gate and carrying means to be assembled as'a unit within the case; and a bearing for the rotor, said rotor and its bearing being related to the case to permit the removal of the rotor and its bearing as a unit from the case, the two units being independently removable in any sequence.

5. In a device of the character described, the combination of a case comprising a rotor bore and a gate bore; a rotor in the rotor bore spaced from the walls thereof, said rotor having a driving abutment sweeping and closing the space; a gate in the gate bore having a groove receiving and passing the abutment through the gate; a bearing for the gate; means carrying the bearing; gears maintaining the timing of the rotor and gate, said gate, bearing, carrying means and gear forming an assembly unit so related to the.

gate bore as to permit the assembly of the gate, bearing for the gate, carrying means and gear to be assembled as a unit within the case; and a bearing for the rotor, said rotor and its bearing being so related to the case as to permit theassembly and removal of the rotor and its bearing as a unit with respect tothe case, the two units being capable of independent removal and assembly in any sequence.

6. In a device of the character described, the combination of a case having a rotor chamber with an outer cylindrical peripheral wall provided with a plurality of pairs of inlet and outlet ports; a rotor mounted in thechamber, the rotor being spaced from the cylindrical walls of the chamber forming an enclosed space; a plurality of driving abutments on the rotor closing and sweeping the walls of the chamber; a plurality of rotatingv gates across the space, said gates having opposed abutment passing grooves of a depth approximating the radii of the gates, said grooves being formed with relation to the abutments to pass the abutments throughthe gates and to make a substantial closure with-the abutments during the pass, the number of abutments being greater than the number of gates but not a multiple thereof; and means driving the rotor and gates in timed relation, the inlet and outlet ports being adjacent to the sides of the gates, each gate defining one side of an exhaust port and an inlet port, said ports extending through the major portion of the width of the chamber and the pairs of ports opening to the same space between gates being spaced apart a greater distance than the outer faces of the adjacent abutments, and substantially the entire flow of fluid through the device passing through said ports.

'7. In a device of the character described, the combination of a case having a rotorchamber with an outer cylindrical peripheral wall provided with two pairs of inlet and outlet ports; a rotor mounted in the chamber, the rotor being spaced from the cylindrical walls of the chamber forming an enclosed space; three driving abutments on the rotor closing and sweeping the walls of the chamber; two rotating gates across the space, said gates having opposed abutment passing grooves of a depth approximating the radii of the gates, said grooves being formedwith relation to the abutments to pass the abutments through the gates and to make a substantial closure with the abutments during the pass; and means driving the rotor'and gates in timed relation, the inlet and outlet ports being adjacent to the sides of the gates, each gate defining one side of an exhaust portand an inlet port, said ports extending through the major portion of the width of the chamber and the pairs of ports opening to the same space between gates being spaced apart a greater distance than the outer faces of the adjacent abutments, and substantially the entire flow of fluid through the device passing through said ports.

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