US2781729A - Fluid pump - Google Patents

Description

Feb. 19, 1957 c. w, JOHNSON ETAL 2,781,729

FLUID PUMP Filed Dec. 22, 1955 4 Sheets-Sheet l 5 T /0 F/ G. l

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- ATTORNEYS Feb. 19, 1957 c. w. JOHNSON ETAL 2,781,729

FLUID PUMP Filed Dec. 22. 1955 4 sheets-sheet 2 INVENTORS 'Cf/ESTEZ 1M JOHNSON BY CZAEE/VCE z KEQGf/ Feb. 19, 1957 c. w. JOHNSON ETAL 2,781,729

7 I FLUID PUMP Filed Dec. 22, 1955 4 Sheets-Sheet s mmvrons 07 55752 14 Jam/so CZABE/VCE fl KEOGH ATTORNEYS 19, 1957 c. w. JOHNSON E'I'AL 2,731,729

FLUID PUMP Filed Dec. 22, 1955 4 Sheets-Sheet 4 75 IN VEN TORS I G. 9 v (f/6575B W. da/i/vsa/v BY CZAZE/VCE 7: X506 FLUID PUMP Chester W. Johnson, Butte, and Clarence T. Keogh, Whitehall, Mont.

Application December 22, 1955, Serial No. 554,760

6 Claims. (Cl. 103-120) The present invention relates to a fluid pump and in particular to a double action and reversible fluid pump.

An object of the present invention is to provide a fluid pump which is reversible and double acting and one which may be used as a fluid motor.

Another object of the present invention is to provide a fluid pump of the rotor and vane type which has means for preventing wear on the vanes.

A further object of the present invention is to provide a fluid pump which is sturdy in construction, one which can be used to pump two fluids at once without appreciable intermingling of the two fluids, and one which is economical to manufacture and assemble.

These and other objects and advantages of the present invention will be fully apparent from the following description when taken in connection with the annexed drawings, in which:

Figure 1 is a sectional view of the fluid pump of the present invention taken on the line 11 of Figure 2,

Figure 2 is a sectional view of the assembly of Figure 1 taken on the line 22 of Figure 1,

Figure 3 is a sectional view taken on the line 33 of Figure 1,

Figure 4 is a sectional view taken on the line 4-4 of Figure 3,

Figure 5 is a sectional view, on an enlarged scale, taken on the line 5-5 of Figure 1,

Figure 6 is a sectional view taken on the line 66 of Figure 5,

Figure 7 is an exploded view partially in section of the components of the assembly of Figure 1,

Figure 8 is a plan view of a modified form of the invention,

Figure 9 is a sectional view taken on the line 9-9 of Figure 8,

Figure 10 is a sectional view taken on the line 1010 of Figure 8, and

Figure 11 is a view taken on the line 11-11 of Figure 8.

Referring in greater detail to the drawings, in Figures 1 to 7, inclusive, a first form of the fluid pump of the present invention is shown and comprises a closed housing 10, circular in cross-section, with opposed abutments 11 and 12 on the inner surface of its wall. A rotatable shaft 13 extends through the rear wall of the housing and has an end portion 14 axially disposed within the housing 10. A rotor 15, having a circular recess in one end thereof so as to be hollow, is positioned within the housing 10 so that its recessed end faces the front wall of the housing 10. The rotor 15 has its other end circumposed about the shaft end portion 14 and connected to the latter for rotation therewith. The rotor 15 in its rotational travel successively wipingly contacts the housing abutments 11 and 12.

The rotor 15 is provided with a plurality of slots 16 extending in radial spaced relation therearound. A circular plate 17 covers the ends of the slots 16 at the end of the rotor opposite to the shaft 13 and is secured to the rotor by means of flat-headed bolts 18. The rear-wall f nited States Patent 0 of the housing designated by the reference numeral 19 supports and is formed integrally with a bearing sleeve 20 which surrounds a bearing 21. The shaft 13 extends through the bearing 21. A nut 22 and an oil seal 23 surrounds the adjacent port-ion of the shaft 13 and is secured to the end of the bearing sleeve 20 remote from the rear wall 19. Another oil seal 24 is positioned on the portion of the shaft between the bearing 21 and the adjacent portion of the rotor 15.

The front wall of the housing is designated by the reference numeral 25 and is formed integrally with and supports a bearing boss 26 which is arranged eccentrically with respect to the shaft end portion 14. A sleeve bearing 27 surrounds the bearing boss 26. A sleeve 28 is mounted upon the sleeve bearing 27 for rotation about the bearing boss 26 as an axis. Another bearing boss 29 is formed integrally with and supported by the bearing boss 26 on the end of the latter remote from the front wall 25. Another sleeve bearing 30 surrounds and is carried by the bearing boss 29. Another sleeve 31 is supported upon the sleeve bearing 30 for rotation about the bearing boss 29 as an axis. The bearing boss 29 is arranged eccentrically with respect to the shaft end portion 14 and also eccentrically with respect to the bearing boss 26.

A plurality of vanes, in two sets, 32 and 33, project from the sleeves 28 and 31, respectively, and have their inner ends connected to the sleeves 28 and 31 for limited swinging movement. The means connecting the vanes of the sets 32 and 33 to the sleeves 28 and 31 is shown in detail in Figures 5 and 6 and comprises a plurality of slotted circular posts 34 slidably mounted on the upturned rim of each of the sleeves 28 and 31. The inner end of each vane 35 of the sets of vanes 32 and 33 is formed with a socket portion 36 receiving one of the posts 34. The vanes 35 project in radial relation about the sleeves 28 and 31 and each vane is slidable in one of the slots 16 in the rotor 15 for movement from the position in which the outer end of the vane is flush with the outer surface of the rotor to a position in which the portion of the vane adjacent that end extends from the slot in the rotor. The vanes 35 are arranged so that the vanes of the set 32 which is associated with the sleeve 31 are each intermediate the adjacent vanes 35 of the other set 33 which is associated with the sleeve 28.

The housing 10 is provided with an inlet 37 and an outlet 33 arranged in spaced relation in the portion of the wall of the housing on each side of and between the abutments 11 and 12. The part of the housing wall between the adjacent inlet 37 and the outlet 38 and the adjacent portion of the rotor 15 defines a pump chamber. The vanes 35 of the set 32 associated with the sleeve 28 successively project into and close the pump chamber designated by the reference numeral 39 on the right side of Figure 1 and the vanes 35 of the set 33 associated with the sleeve 31 successively project into and close the pump chamber 40 on the left side of that figure upon execution of rotational travel of the rotor 15.

Referring to Figures 8 to 11, inclusive, a second form of the fluid pump of the present invention is shown in which means is provided for shifting the bearing bosses relative to the shaft end portion and the associated sections of the walls of the housing so as to effect the output of the pump. If the device is used as a motor, such shifting of the bearing bosses and the associated sections of the walls of the housing acts as a speed control for the rotor. In this form of the pump of the present invention, the closed housing 41 has a front wall 42 and a rear wall 43. A rotatable shaft 44 has an end portion 45 axially disposed within the housing 41 and is journaled in a bearing 46 which is supported in the housing rear wall 43. A hollow rotor 47 is circumposed about the shaft end portion 45 and is connected to the shaft end portion by means of the key 48, shown in dotted lines in Figure 9, and a nut 49, for rotation with the shaft end portion, the part of the shaft end portion 45 inwardly of the end thereof being provided with threads for securing the nut 49. e

The housing 41 has opposed fixed main wall sections and 51 and subsidiary wall sections 52 and 53 extending between and closing the spaces between the main wall sections 50 and 51. An abutment 54 is provided on the inner surface of the main wall section 50 intermediate the ends thereof and another abutment 55 is provided on the inner surface of the main wall section 51 intermediate the ends of the latter, the abutments 54 and 55 being shown in dotted lines in Figure 8. The rotor 47 in its rotational travel wipingly contacts the abutment 54 and 55. The rotor 47 has a plurality of slots 56 arranged in radial spaced relation thercalong, two of them being shown in dotted lines in Figure 8. A first hollow bearing boss 57 is arranged eccentrically with respect to the shaft end portion 45 and projects into the rotor 47 and is connected to the housing 41 for movement toward and away from the inner periphery of the rotor 47 in a rectilinear path. The means connecting the hearing boss 57 to the housing 41 consists in a web 58 extending across the bearing boss 57, as shown in dotted lines in Figure 8, the web being connected to or formed integrally with one end of a first slide bar 59 disposed in one end portion of a slot 60 which extends diametrically across the front wall 42 of the housing 41. A first sleeve 61 and similar to the sleeve 28 of the first form of the invention shown in Figures 1 to 7, inclusive, is rotatable about the first bearing boss 57 as an axis.

A second bearing boss 62 is arranged eccentrically with respect to the first bearing boss 57 and the shaft end portion 45 and projects into the rotor 47 and is connected to the housing 41 for movement toward and away from the inner periphery of the rotor 47. The means con meeting the bearing boss 62 to the housing 41 consists in a post 63 projecting from the adjacent end of another slide bar 64 also mounted in the slot 60 inwardly of the other end of the latter for sliding movement and carrying the second bearing boss 62 for movement toward and away from the inner periphery of the rotor 47 in a rectilinear path. A second sleeve 65 is rotatable about the second bearing boss 62 as an axis.

A plurality of vanes 66 are arranged so that they project in radial relation about the first sleeve 61 and the second sleeve 65 and each is slidable in one of the slots 56 in the rotor 47. The vanes 66 are identical with the vanes 35 shown in the first form of the invention in Figures 1 to 7, inclusive, and one of them is shown in dotted lines in Figure 8. The same means which connects the vanes 35 to the associated sleeve 28 and 31 in the form of the invention shown in Figures 1 to 7, inclusive, connects each of the vanes 66 to the associated sleeves 61 and 65. The vanes 66 are likewise arranged in the same manner as the vanes 35 of the first embodiment of the present invention so that one of the vanes associated with the sleeve 61 is intermediate the adjacent vanes of the other sleeves 65.

The slide bar 59 connects the subsidiary wall section 52 to the bearing boss 57 for movement from the position closing the space between the adjacent ends of the main wall sections 50 and 51 to a position toward the rotor 47 responsive to the execution of the movement of the first bearing boss 57 away from the inner periphery of the rotor 47. The other slide bar 64 connects the other of the subsidiary wall sections 53 to the post 63 and to the bearing boss 62 for movement from the position closing the space between the other adjacent ends of the main wall sections 50 and 51 to a position toward the rotor 47 responsive to the execution of the movement of the bear ing boss 62 away from the inner periphery of the rotor 47.

An inlet 67 and an outlet 68 are provided in a portion of the main wall sections 50 and 51 adjacent each of the subsidiary wall sections 52 and 53, as shown in dotted lines in Figure 8. Each of the subsidiary wall sections 52 and 53 and the parts of the main wall sections 50 and 51 on the sides of the inlets 67 and the outlets 68 and ad jacent thereto and the adjacent rotor 47 defines a pump chamber. The pump chamber on the right-hand side of Figure 8 is designated by the numeral 69 and the pump chamber on the left-hand side of Figure 8 is designated by the reference numeral 70. A bearing 71 surrounds the bearing boss 57 and supports the sleeve 61 for rotational movement therearound and another bearing 72 surrounds the bearing boss 62 and supports the sleeve 65 for rotation therearound. The vanes of the sleeve 61 successively extend into and close the one pump chamber 69 and the vanes of the other sleeve 65 extend into and successively close the pump chamber upon execution of rotational travel of the rotor 47.

An actuating member, embodying a cam 73 slidably received within an elongated hole 74 in each of the subsidiary wall sections 52 and 53, operatively connects the hearing bosses 57 and 62 together for simultaneous movement, each of the earns 73 being mounted upon one end of an arm 75. The other end of each of the arms '75 is connected together by an actuating bar 76 for rotation of the cams 73 in the same direction upon reciprocating movement of the bar 76 to eifect the movement of the subsidiary wall sections 52 and 53 inwardly of the housing toward the rotor 47 to reduce the dimension of the pump chambers 69 and 70, respectively. It is an important feature of the present invention that the vanes 66 do not frictionally engage the inner surface of the subsidiary wall sections 52 and 53 when they enter the pump chambers and substantially close the pump chambers. The connection of the bearing bosses 57 and 62 to the subsidiary wall sections 52 and 53, respectively, causes the bearing bosses 57 and 61 to move with the wall sections 52 and 53 so that the vanes 66 continue to enter the pump chambers 69 and 70 without frictionally engaging the inner surface of the wall sections 52 and 53 in all positions of movement of the subsidiary wall sections 52 and 53.

Plates 77 and 78 bridge the slots 60 in the front wall 42 of the housing 41 and retain the slide bars 59 and 64, respectively, within the slot 60. Bolts 79 secure the front I wall 42 to the housing 41.

In operation, in the first form of the invention shown in Figures 1 to 7, inclusive, the inlets 37 are connected to a source of fluid and the outlets 38 are connected to a placeof discharge of fluid. The shaft 13 is connected to a source of rotative power and as the rotor 15 rotates the vanes 35 of the one set of vanes 32 extend into the pump chamber 39 and drive the fluid received from the inlet 37 towards the adjacent outlet 38. At the same time the vanes 35 of the set of vanes 33 extend into and close the pump chamber 40 to drive the fluid from the associated inlet 37 towards the outlet 38. The pivotal connection of each of the vanes 35 with its associated sleeve 28 or 31 permits the sliding movement of the vanes within their associated slots in the rotor without binding.

The operation of the fluid pump of the second form of the invention shown in Figures 8 to 11, inclusive, is the same as that of the fluid pump shown in Figures 1 to 7, inclusive. Upon connection of the shaft 44 to a source of rotative power and connection of the inlets 67 to a source of fluid and the outlets 68 to a place of discharge of the fluid, the vanes 66 associated with the sleeve 61 project into and close the pump chamber 69. The other vanes 66 which are associated with the second sleeve 65 project into and close the pump chamber 70, driving the fluid received from the associated inlet 67 to the associated outlet 68. Upon reciprocatory movement of the bar 76 in either direction, the subsidiary wall sections 52 and 53 are moved inwardly of the housing 41 to reduce the size of the respective one of the pump chambers 69 and 70. The bearing bosses57 and 62 are also moved away from the inner periphery'of the rotor 47 so that the vanes 66 extend a lesser distance from the slots in the rotor 47 but still enter and close the associated one of the pump chambers 69 and 70.

Each of the fluid pumps of the two embodiments here shown and described may be used as a fluid motor with their inlets connected to a source of fluid under pressure. In the form of the invention shown in Figures 8 to 11, in-

3. A'fluid pump comprising a closed housing having opposed abutments on the inner surface of the wall thereof, a rotatable shaft having an end portion'axially disposed in said housing, "a hollow rotor circumposed clusive, the cross-sectional area of the pump chambers 69 and 70 may be changed at will to either control the output of the pump when it is used as a pump or to control the speed of the rotor when used as a motor with fluid from a constant pressure source acting as the driving agent.

The limited swinging movement of the vanes 35 with respect to the sleeves '23 and 31 and the limited swinging movement of the'van'es 66 with respect to the sleeves 61 and 62 is necessary due to the eccentrically-disposed axes of the bearing bosses.

What is claimed isi 1. A fluid pump comprising a closed housing having opposed abutments on the inner surface of the Wall thereof, a rotatable shaft having an end portion axially disposed in said housing, a hollow rotor circumposed about said shaft end portion and connected to the latter for rotation therewith, 'said rotor in its rotational tr-avel successively wipingly contacting said housing abutments, there being a plurality of slots in said rotor extending in radial spaced relation therearou'nd, a first sleeve disposed within said rotor and rotatable about an axis eccentrically disposed with respect to said shaft end portion, a second sleeve disposed within said rotor and rotatable about another axis eccentrically disposed with respect to said first-named axis and said shaft end portion, a plurality of vane projectin'g in radial relation about each of said first and second sleeves and each slidable in a slot of said rotor, the va'ne's being arranged so that one of the vanes of one of said sleeves is intermediate adjacent vanes of the other of said sleeves, and an inlet and an outlet arranged in spaced relation in the portion of 'the wall of said housing on each side of and between said abutments, the part of the housing wall between the adjacent inlet and outlet and the adjacent portion of said rotor defining a pump chamber, the vanes of the one sleeve successively extending into and closing one of said pump chambers and the vanes of the other sleeve successively extending into and closing the other of the pump chambers upon execution of the rotational travel of said rotor.

2. A fluid pump comprising a closed housing having opposed abutments on the inner surface of the wall thereof, a rotatable shaft having an end portion axially disposed in said housing, a hollow rotor circumposed about said shaft end portion and connected to the latter for rotation therewith, said rotor in its rotational travel successively wipingly contacting said housing abutments, there being a plurality of slots in said rotor extending in radial spaced relation therearound, a first sleeve disposed within said rotor and rotatable about an axis eccentrically disposed with respect to said shaft end portion, a second sleeve disposed within said rotor and rotatable about another axis eccentrically disposed with respect to said first-named axis and said shaft end portion, :a plurality of vanes projecting in radial relation about each of said first and second sleeves and connected thereto for limited swinging movement and each slidable in a slot of said rotor, the vanes being arranged so that one of the vanes of one of said sleeves is intermediate adjacent vanes of the other of said sleeves, and an inlet and an outlet arranged in spaced relation in the portion of the wall of said housing on each side of and between said abutments, the part of the housing wall between the adjacent inlet and outlet and the adjacent portion of said rotor defining a pump chamber, the vanes of the one sleeve successively extending into and closing one of said pump chambers and the vanes of the other sleeve successively extending into and closing the other of the pump chambers upon execution of the rotational travel of said rotor.

about said shaft end portion and connected to the latter for rotation therewith, said rotor in its rotational travel successively wipingly contacting said housing abutments, there being a plurality of slots in said rotor extending in radial spaced relation therearound, a first bearing boss arranged eccentrically with respect to said shaft end portion, a first sleeve disposed within said rotor and rotatably mounted upon said first bearing boss, a second bearing boss arranged eccentrically with respect to said first bearing boss and said shaft end portion, a second sleeve disposed within said, rotor and rotatably mounted upon said second bearing boss, a plurality of vanes projecting in radial relation about each of said first and second sleeves and each slidable in a slot of said rotor, the vanes being arranged so that one of the vanes of one of said sleeves is intermediate adjacent vanes of the other of said sleeves, and an inlet and an outlet arranged in spaced relation in the portion of the wall of said hous ing on each side of and between said abutments, the part of the housing wall between the adjacent inlet and outlet and the adjacent portion of said rotor defining a pump chamber, the vanes of the one sleeve successively extending into and closing one of said pump chambers and the vanes of the other sleeve successively extending into and closing the other of the pump chambers upon execution of the rotational travel of said rotor.

4. A fluid pump comprising a closed housing, a rotatable shaft having an end portion axially disposed in said housing, a hollow rotor circumposed about said shaft end portion and connected to the latter for rotationtherewith, said housing having opposed fixed main wall sections and a subsidiary wall section extending between and closing the space'between adjacent ends of each of said main wall sections, means connecting said subsidiary wall sections to said housing for movement from the positions closing the space between adjacent ends of said main wall sections to positions toward said rotor, an abutment on the inner surface of the wall of each main wall ection intermediate its ends thereof, said rotor in its rotational travel successively wipingly contacting said housing abutments, there being a plurality of slots in said rotor extending in radial spaced relation therearound, a first sleeve disposed within said rotor and rotatable about an axis eccentrically disposed with respect to said shaft end portion, a second sleeve disposed within said rotor and rotatable about another axis eccentrically disposed with respect to said first-named axis and said shaft end portion, a plurality of vanes projecting in radial relation about each of said first and second sleeves and each slidable in a slot of said rotor, the vanes being arranged so that one of the vanes of one of said sleeves is intermediate adjacent vanes of the other of said sleeves, and an inlet and an outlet in the portions of the main wall sections adjacent each subsidiary wall section, each of said subsidiary wall sections and the part of the main wall sections on the sides of said inlet and outlet adjacent thereto and the adjacent portion of said rotor defining a pump chamber, the vanes of the one sleeve successively extending into and closing one of said pump chambers and the vanes of the other sleeve successively extending into and closing the other of the pump chambers upon execution of the rotational travel of said rotor.

5. A fluid pump comprising a closed housing, a rotatable shaft having an end portion axially disposed in said housing, a hollow rotor circumposed about said shaft end portion and connected to the latter for rotation therewith, said housing having opposed fixed main wall sections and a subsidiary wall section extending between and closing the space between adjacent ends of each of said main wall sections, means connecting said subsidiary wall sections to said housing for simultaneous movement together from the positions closing the space between adjacent ends of said main wall sections to positions toward said rotor, an abutment on the inner surface of the wall of each main wall section intermediate its ends thereof, said rot-or in its rotational travel successively wipingly contacting said housing abutments, there being a plurality of slots in said rotor extending in radial spaced relation therearound, a first sleeve disposed within said rotor and rotatable about an axis eccentrically disposed with respect to said shaft end portion, a second sleeve disposed within said rotor and rotatable about another axis eccentrically disposed with respect to said first-named axis and said shaft end portion, a plurality of vanes projecting in radial relation about each of said first and second sleeves and each slidable in a slot in said rotor, the vanes being arranged so that one of the vanes of one of said sleeves is intermediate adjacent vanes of the other of said sleeves, an inlet and an outlet in the portions of the main wall sections adjacent each subsidiary wall section, each of said subsidiary wall sections and the parts of said rn'ain wall sections on the sides of said inlet and outlet adjacent thereto and the adjacent portion of said rotor defining a pump chamber, the vanes of the one sleeve successively extending into and closing one of said pump chambers and the vanes of the other sleeve successively extending into and closing the other of the pump chambers upon execution of the rotational travel of said rotor, and an actuating member operatively connected to said subsidiary wall sections for effecting the movements of the latter.

6. A fluid pump comprising a closed housing, a rotatable shaft having an end portion axially disposed in said housing, a hollow rotor circurnposed about said shaft end portion and connected to the latter for rotation therewith, said housing having opposed fixed main wall sections and a subsidiary wall section extending between and closing the space between said main Wall sections, an abutment on the inner surface of the wall of each main wall section intermediate its ends thereof, said rotor in its rotational travel successively wipingly contacting said abutments, there being a plurality of slots in said rotor extending in radial spaced relation therearound,

a first bearing boss arranged eccentrically with respect to said shaft end portion and projecting into said rotor and connected to said housing for movement toward and away from the inner periphery of said rotor in a rectilinear path, a first sleeve rotatable about said first bearing boss as an axis, a second bearing boss arranged eccentrically with respect to said first bearing boss and said shaft end portion and projecting into said rotor and connected to said housing for movement toward and away from the inner periphery of said rotor, a second sleeve rotatable about said second bearing boss as an axis, a plurality of vanes projecting in radial relation about each of said first and second sleeves and each slidable in a slot of said rotor, the vanes being arranged so that one of the vanes of one of said sleeves is intermediate adjacent vanes of the other of said sleeves, one of said subsidiary wall sections being connected to said first bearing boss for movement from the position closing the space between adjacent ends of said main wall sections to a position toward said rotor responsive to the execution of the movement of said first bearing boss away from the inner periphery of said rotor and the other of said subsidiary wall sections being connected to said second bearing boss for movement from the position closing the space between the other adjacent ends of said main wall sections to a position toward said rotor responsive to the execution of the movement of said second bearing boss away from the inner periphery of said rotor, an inlet and an outlet in the portions of the main wall sections adjacent each subsidiary wall section, each of said subsidiary wall sections and the parts of said main wall sections on the sides of said inlets and outlets adjacent thereto and the adjacent portion of said rotor defining a pump chamber, the vanes of one sleeve successively extending into and closing one of said pump chambers and the vanes of the other of said sleeves successively extending into and closing the other of said pump chambers upon execution of rotational travel of said rotor, and an actuating member operatively connected to said first and second bearing bosses for effecting their simultaneous movement together.

No references cited.

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