CA1144423A - Fluid pump - Google Patents
Fluid pumpInfo
- Publication number
- CA1144423A CA1144423A CA000331644A CA331644A CA1144423A CA 1144423 A CA1144423 A CA 1144423A CA 000331644 A CA000331644 A CA 000331644A CA 331644 A CA331644 A CA 331644A CA 1144423 A CA1144423 A CA 1144423A
- Authority
- CA
- Canada
- Prior art keywords
- chamber
- pump
- housing
- guideway
- block
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
ABSTRACT
An improved fluid pump having two or more cylindrical eccentric or elliptical rotors drive connected to revolve together at identical angular velocities, and positioned in cylindrical chambers for compressing fluids therein. The pump includes separate intake ports and discharge ports to and from the chambers allowing the pump to be used as a single stage pump or by connecting the discharge port of one chamber with the intake port of the other chamber the pump can be used as a two stage pump for increased pressure with less volume.
An improved fluid pump having two or more cylindrical eccentric or elliptical rotors drive connected to revolve together at identical angular velocities, and positioned in cylindrical chambers for compressing fluids therein. The pump includes separate intake ports and discharge ports to and from the chambers allowing the pump to be used as a single stage pump or by connecting the discharge port of one chamber with the intake port of the other chamber the pump can be used as a two stage pump for increased pressure with less volume.
Description
FLUID PUMP
___ _ This invention relates generally to fluid pumps or compressors and more particularly but not by way of limitation to rotary pumps having eccentric or elliptical rotors mounted in adjacent cylindrical chambers .
Heretofore there have been various types of rotary pumps having a pair of eccentric rotors mounted in adjacent cylindrlcal chambers with a passageway between the chambers. Mounted in the passageway is a slidably mounted valve. The ends of the valve are disposed against a portion of the cylindrical sides of the rotors. These pumps have a single intake and discharge port connected to the valve. As the valve slides back and forth in the passageway, the valve directs the fluid into the chambers and discharges the compressed fluid into the dis-charge port.
There are similar prior art rotary pumps to the above which include sleeves mounted around the eccentric rotors. These sleeves are attached to a slide which is mounted in a passageway between the chambers. These types of pumps also have a single intake ancl discharge port for receiving and discharging the compressed fluid from the two chambers. The pumps require sealed lubrication for the valves, sleeves and other parts or the pump application must be limited to fluids having lubricating capability.
None of the prior art pumps disclose the novel features of the subject invention as herein described.
The improved rotary pump is simple in design and eliminates the need of complex valving in the pump housing and internal lubrication.
'rhe separate cylindrical chambers in the pump housing each contain separate intake and discharge ports. The separate porting allows the pump to be used as either a single stage purnp or by connecting the discharge port of one chamber with the intake port of the other chamber the pump can be used as a two stage pump for higher pressure.
The arrangement of the pump also permits using one section of the nit to compress a gas such as air, then after removlng the heat of compression from the gas by passing it through a heat exchanger, the compressed gas is passed through the second section wh~re it expands, turning the second rotor whlch is drive connected to t~e first rotor.
Thus the expanding gas returns part of the energy usedto compress it, and the energy thus consumed further reduces the gas temperature. This refrigerating effect may be used in many ways. Likewise, the heat of compression removed in the heat exchanger may be utilized.
A floating block is mounted in a guideway. The guideway interconnects the two chambers. The ends of the block are disposed adjacent to cylindrical portions of the rotors maintaining a small but equal clearance as the rotors revolve together. The block acts as a barrier to maintain pressure differentials between the two ad-jacent chambers and between the intake port and the discharge port of each chamber. However, due to the pressure differential, a small amount of fluid will flow through the clearance spaces between the ends of the block and the two rotors. Also a small amount of fluid will flow in the spaces between the sides of the block and the guide-way. During operation this leakage provides a flow rate sufficient to float the block as it moves back and forth in the guideway, and also keeps the ends of the block centered between the tangent sur-faces of the twc rotors, as they rotate together in the same angular phase relationship.
This application of the fluid bearing principle floats the block during pump operation, so that contact between the block and the surface of the guideway is prevented, thereby reducing friction, reducing wear and reducing the high cost of maintenance in the pur-chase of replacement parts. Therefore a complicated lubrication sys-tem is eliminated. However, it may be practical to line the guideway or make the block out of some type of self-lubricating material such as graphite, Teflon (a Lrademark) or impregnated porous metal or plas-tic. This will revent wear during starting or shut down times when the p~mlp speed may be too slow to activate the air bearing for a brief per-iod. ~Yith the internal lubrication system eliminated, the internal portions of the pump are free of oil, permitting fluids to be pumped without the possibility of being contaminated by oil.
In summary the present invention is a fluid pump for compressing a working fluid therein, the pump comprising: a pump housing having a first end portion~ a second end portion and a center portion; a first cylindrical cham-ber in the first end portion of said housing; a first cylindrical eccentric rotor positioned in said first chamber and rotatably attached to said hous-ing; a .Eirst intake port in the center portion of sai.d housing and connected to said first chamber; a first discharge port in the center portion of said housing and connected to said first chamber; a second cylindrical chamber in the second end portion of said housing and parallel to said first chamber; a second cylindrical eccentric rotor positioned in said second chamber and rotatably attached to said housing; a second intake port in the center por-tion of said housing and connected to said second chamber; a second discharge port in the center portion of said housing and connected to said second chamber; a rectangular shaped guideway in the center portion o-E said housing and therethrough, said guideway interconnecting said first chamber and said second chamber; a rectcmgular sllaped floating block slidably received in said guideway, the ends of said block disposed adjacent a portion of the cylindrical surface of said first and said second rotors as said rotors rotate in said chambers, the sides of said block disposed adjacent said guideway, the width of said guideway sufficient to provide a clearance be-tween the sides of said block and said guideway so that in operation the pressure differential between said first chamber and said second chamber causes leakage of a sufficient amount of the working fluid through the clear-ance between the sides of said block and said guideway to provide a fluid bearing therebetween, and drive means for rotating said first and second rotors in said first and second chambers.
--'I--The invention will now be described in greater detail with reference to the accompanying drawings, in which:
Figure 1 is a side view of the improved fluid pump with the end plates of the pump removed. The eccentric rotors are shown rotated in the same direction;
Figure 2 is a top view of the improved fluid pump; and Figure 3 is a side view of the improved fluid pump as shown in Figure 2.
In Figure 1 the improved fluid pump is designated by the general reference number 10. The pump 10 includes a pump housing 12, a first cyl-indrical chamber 14, a first cylindrical eccentric rotor 16 mounted on a first rotor shaft 18, a second cylindrical chamber 20, a second cylindrical eccentric rotor 22 mounted on a second rotor shaft 24, and a floating block 26. While the improved fluid pump 10 is described in detail as acting as a pump it is understood that it could act also as a compressor.
The pump housing 12 includes a first end portion 28 with the first chamber 14 therein, a second end portion 30 with the second chamber 20 -4a-a~J~
nerein, and a center portion 32 having a guicleway 34 therethrough con-necting the first chamber 14 and second chamber 2~. Tlle floating block 26 is slidably mounted in the guideway 34. The direction of movement of the block 26 is indicated by arrow 35.
The center portion 32 of the pump housing 12 further includes a first intake port 36 connected to the cham~er 14 and a first discharge port 38 connected to the first chamber 14. The center portion 32 also includes a second intake port 40 connected to the second chamber 20 and a second discharge port 42 connected to second chamber 20.
In this view the end plates of the pump 10 are removed so that a cross section of the pump can be seen exposing the rotatably mounted eccentric rotors 16 and 22. The rotors 16 and 22 have a portion of their cylindrical surface tangent to the sides of the chambers 14 and 20 at a twelve o'clock position. In this position a portion of the chambers 14 and 20 are shown receiving fluid to be compressed through the intake ports 36 and 40 and represented by arrows 44 and 46. In a separate portion of the chambers 14 and 20 the fluid represented by arrows 48 and 50 is being compressed and discharged through discharge ports 38 ancl 42.
The floating block 26 includes sides 52 and end portions 54. It should 20 be noted in this view that while the end portions 54 of the block 26 are dis-posed adjacent the rotating rotors 16 and 22, a clearance 55 is provided between the cylindrical surface of the rotors and the end portions 54 so that a pressure differential of the fluid between the intake ports 36 and 40 and the discharge ports 38 and 42 provide a fluid bearing between the end portions 54 and the cylindrical surface of the rotors. Also a clearance 57 between sides 58 of the guideway 34 and sides 52 of the block 26 allows a limited flow of the fluid between the chambers 14 and 20. During operation of the pump 10 the pressure differential between the two chambers provides a fluid bearing between the sides 52 of the floating block 34 and the sides 58 of the guideway 26. The block 26 is rectangular in shape. The block 26 may be solid, hollow or made with cavities to remove weight. Its surfaces may be made of self-lubricating material such as Teflon (a trademark), molybdenum, graphite, impregnated porous metal or the like.
During the startup of the pump 10, the sides 52 and the end por-tion 54 of the floating block 26 will briefly contact the sides 5~
of the guideway 34 and a portion of the cylindrical surface of the rotors 16 and 22. The solid lubricant on the block 26 will prevent metal to metal contact between the rubbing surfaces as the block 26 moves back and forth in the guideway 34. When the rotors 16 and 22 reach operating speed the pressure differential in the chambers 14 and 20 is sufficient to cause the block 26 to begin floating on the fluid bearing in the clearances 55 and 57. While the clearances 55 and 57 are sufficient enough to provide fluid flow (i.e. .001 inches to .005 inches) in order to provide the fluid bearing, in turn the clearance 55 is small enough to allow thefloating blocl~ 26 to act as an effective seal between the intake ports and the discharge ports in the chambers 14 and 20 as the fluid is being compressed. Also the clearance 57 in the guideway 34 is small enough so that the block 26 is also an effective seal between the two chambers 14 and 20.
In this figure the first rotor shaft 18 and the second rotor shaft 24 rotate the eccentric rotors 16 and 22 in a clockwise position as indicated by arrows 60. ~y rotating both of the rotors in the same direction the discharge port 38 is adjacent to the intake port 40 at the bottom of the center portion 32 of the housing 12. This port ar-rangement makes the pump 10 readily adaptable for connecting these two ports together so that the pump 10 can be used as a two stage pump.
Should this arrangement be desired the compressed fluid in the first chamber 14 would be routed via discharge port 3~ into intake port 40 and then into the second chamber 20 thereby providing additional two stage compression of the fluid and providing higher fluid pressures discharged through the second discharge port 42. An intermedia~e heat exchanger may be inserted in the flow following discharge port 11~4~23 38 and ahead of intake port 40 to remove the first stage heat of compression.
In Figure 2 a top view of the pump 10 is seen with end plates 62 of the pump 10 attached to the sides of the housing 12. In this view a top view of the intake port 36 and discharge port 42 are shown and as described under Figure 1. The end plates 62 of the pump 10 are attached by bolts 64 screwed into the sides of the housing 12.
The first rotor shaft 18 is shown having a first end portion 66 and a second end portion 68 extending from the housing 12. The first end portion 66 is connected to a drive motor which is not shown. The drive motor drives 10 the pump 10. A first drive pulley 70 is connected to the second end portion 68 of the first rotor shaft 18. The second rotor shaft 24 includes a first end portion 72 having a second drive pulley 74 attached thereto. The first rotor shaft 18 drives the second rotor shaft 24 by connecting the first drive pulley 70 and the second drive pulley 74 with a timing drive 76 or other synchronous drive means. An idler pulley 78 may be provided between first drive pulley 70 and second drive pulley 74 to control belt tension if a timing belt is used. Other types of synchronous drives such as gears, bar linkage or chains may not require tension control.
In Figure 3 a side view of the pump 10 is seen as shown in Figure 20 2. In this view the drive belt 76 can be seen attached to the first drive pulley 70 and the second drive pulley 74 with the idler pulley 78 positioned therebetween.
The first rotor shaft 18 and the second rotor shaft 24 are driven in the same direction as indicated by the arrows 60. Also it is understood that chain drives oould be used or any other method well known in the art for driving rotor shafts.
A~ -7-
___ _ This invention relates generally to fluid pumps or compressors and more particularly but not by way of limitation to rotary pumps having eccentric or elliptical rotors mounted in adjacent cylindrical chambers .
Heretofore there have been various types of rotary pumps having a pair of eccentric rotors mounted in adjacent cylindrlcal chambers with a passageway between the chambers. Mounted in the passageway is a slidably mounted valve. The ends of the valve are disposed against a portion of the cylindrical sides of the rotors. These pumps have a single intake and discharge port connected to the valve. As the valve slides back and forth in the passageway, the valve directs the fluid into the chambers and discharges the compressed fluid into the dis-charge port.
There are similar prior art rotary pumps to the above which include sleeves mounted around the eccentric rotors. These sleeves are attached to a slide which is mounted in a passageway between the chambers. These types of pumps also have a single intake ancl discharge port for receiving and discharging the compressed fluid from the two chambers. The pumps require sealed lubrication for the valves, sleeves and other parts or the pump application must be limited to fluids having lubricating capability.
None of the prior art pumps disclose the novel features of the subject invention as herein described.
The improved rotary pump is simple in design and eliminates the need of complex valving in the pump housing and internal lubrication.
'rhe separate cylindrical chambers in the pump housing each contain separate intake and discharge ports. The separate porting allows the pump to be used as either a single stage purnp or by connecting the discharge port of one chamber with the intake port of the other chamber the pump can be used as a two stage pump for higher pressure.
The arrangement of the pump also permits using one section of the nit to compress a gas such as air, then after removlng the heat of compression from the gas by passing it through a heat exchanger, the compressed gas is passed through the second section wh~re it expands, turning the second rotor whlch is drive connected to t~e first rotor.
Thus the expanding gas returns part of the energy usedto compress it, and the energy thus consumed further reduces the gas temperature. This refrigerating effect may be used in many ways. Likewise, the heat of compression removed in the heat exchanger may be utilized.
A floating block is mounted in a guideway. The guideway interconnects the two chambers. The ends of the block are disposed adjacent to cylindrical portions of the rotors maintaining a small but equal clearance as the rotors revolve together. The block acts as a barrier to maintain pressure differentials between the two ad-jacent chambers and between the intake port and the discharge port of each chamber. However, due to the pressure differential, a small amount of fluid will flow through the clearance spaces between the ends of the block and the two rotors. Also a small amount of fluid will flow in the spaces between the sides of the block and the guide-way. During operation this leakage provides a flow rate sufficient to float the block as it moves back and forth in the guideway, and also keeps the ends of the block centered between the tangent sur-faces of the twc rotors, as they rotate together in the same angular phase relationship.
This application of the fluid bearing principle floats the block during pump operation, so that contact between the block and the surface of the guideway is prevented, thereby reducing friction, reducing wear and reducing the high cost of maintenance in the pur-chase of replacement parts. Therefore a complicated lubrication sys-tem is eliminated. However, it may be practical to line the guideway or make the block out of some type of self-lubricating material such as graphite, Teflon (a Lrademark) or impregnated porous metal or plas-tic. This will revent wear during starting or shut down times when the p~mlp speed may be too slow to activate the air bearing for a brief per-iod. ~Yith the internal lubrication system eliminated, the internal portions of the pump are free of oil, permitting fluids to be pumped without the possibility of being contaminated by oil.
In summary the present invention is a fluid pump for compressing a working fluid therein, the pump comprising: a pump housing having a first end portion~ a second end portion and a center portion; a first cylindrical cham-ber in the first end portion of said housing; a first cylindrical eccentric rotor positioned in said first chamber and rotatably attached to said hous-ing; a .Eirst intake port in the center portion of sai.d housing and connected to said first chamber; a first discharge port in the center portion of said housing and connected to said first chamber; a second cylindrical chamber in the second end portion of said housing and parallel to said first chamber; a second cylindrical eccentric rotor positioned in said second chamber and rotatably attached to said housing; a second intake port in the center por-tion of said housing and connected to said second chamber; a second discharge port in the center portion of said housing and connected to said second chamber; a rectangular shaped guideway in the center portion o-E said housing and therethrough, said guideway interconnecting said first chamber and said second chamber; a rectcmgular sllaped floating block slidably received in said guideway, the ends of said block disposed adjacent a portion of the cylindrical surface of said first and said second rotors as said rotors rotate in said chambers, the sides of said block disposed adjacent said guideway, the width of said guideway sufficient to provide a clearance be-tween the sides of said block and said guideway so that in operation the pressure differential between said first chamber and said second chamber causes leakage of a sufficient amount of the working fluid through the clear-ance between the sides of said block and said guideway to provide a fluid bearing therebetween, and drive means for rotating said first and second rotors in said first and second chambers.
--'I--The invention will now be described in greater detail with reference to the accompanying drawings, in which:
Figure 1 is a side view of the improved fluid pump with the end plates of the pump removed. The eccentric rotors are shown rotated in the same direction;
Figure 2 is a top view of the improved fluid pump; and Figure 3 is a side view of the improved fluid pump as shown in Figure 2.
In Figure 1 the improved fluid pump is designated by the general reference number 10. The pump 10 includes a pump housing 12, a first cyl-indrical chamber 14, a first cylindrical eccentric rotor 16 mounted on a first rotor shaft 18, a second cylindrical chamber 20, a second cylindrical eccentric rotor 22 mounted on a second rotor shaft 24, and a floating block 26. While the improved fluid pump 10 is described in detail as acting as a pump it is understood that it could act also as a compressor.
The pump housing 12 includes a first end portion 28 with the first chamber 14 therein, a second end portion 30 with the second chamber 20 -4a-a~J~
nerein, and a center portion 32 having a guicleway 34 therethrough con-necting the first chamber 14 and second chamber 2~. Tlle floating block 26 is slidably mounted in the guideway 34. The direction of movement of the block 26 is indicated by arrow 35.
The center portion 32 of the pump housing 12 further includes a first intake port 36 connected to the cham~er 14 and a first discharge port 38 connected to the first chamber 14. The center portion 32 also includes a second intake port 40 connected to the second chamber 20 and a second discharge port 42 connected to second chamber 20.
In this view the end plates of the pump 10 are removed so that a cross section of the pump can be seen exposing the rotatably mounted eccentric rotors 16 and 22. The rotors 16 and 22 have a portion of their cylindrical surface tangent to the sides of the chambers 14 and 20 at a twelve o'clock position. In this position a portion of the chambers 14 and 20 are shown receiving fluid to be compressed through the intake ports 36 and 40 and represented by arrows 44 and 46. In a separate portion of the chambers 14 and 20 the fluid represented by arrows 48 and 50 is being compressed and discharged through discharge ports 38 ancl 42.
The floating block 26 includes sides 52 and end portions 54. It should 20 be noted in this view that while the end portions 54 of the block 26 are dis-posed adjacent the rotating rotors 16 and 22, a clearance 55 is provided between the cylindrical surface of the rotors and the end portions 54 so that a pressure differential of the fluid between the intake ports 36 and 40 and the discharge ports 38 and 42 provide a fluid bearing between the end portions 54 and the cylindrical surface of the rotors. Also a clearance 57 between sides 58 of the guideway 34 and sides 52 of the block 26 allows a limited flow of the fluid between the chambers 14 and 20. During operation of the pump 10 the pressure differential between the two chambers provides a fluid bearing between the sides 52 of the floating block 34 and the sides 58 of the guideway 26. The block 26 is rectangular in shape. The block 26 may be solid, hollow or made with cavities to remove weight. Its surfaces may be made of self-lubricating material such as Teflon (a trademark), molybdenum, graphite, impregnated porous metal or the like.
During the startup of the pump 10, the sides 52 and the end por-tion 54 of the floating block 26 will briefly contact the sides 5~
of the guideway 34 and a portion of the cylindrical surface of the rotors 16 and 22. The solid lubricant on the block 26 will prevent metal to metal contact between the rubbing surfaces as the block 26 moves back and forth in the guideway 34. When the rotors 16 and 22 reach operating speed the pressure differential in the chambers 14 and 20 is sufficient to cause the block 26 to begin floating on the fluid bearing in the clearances 55 and 57. While the clearances 55 and 57 are sufficient enough to provide fluid flow (i.e. .001 inches to .005 inches) in order to provide the fluid bearing, in turn the clearance 55 is small enough to allow thefloating blocl~ 26 to act as an effective seal between the intake ports and the discharge ports in the chambers 14 and 20 as the fluid is being compressed. Also the clearance 57 in the guideway 34 is small enough so that the block 26 is also an effective seal between the two chambers 14 and 20.
In this figure the first rotor shaft 18 and the second rotor shaft 24 rotate the eccentric rotors 16 and 22 in a clockwise position as indicated by arrows 60. ~y rotating both of the rotors in the same direction the discharge port 38 is adjacent to the intake port 40 at the bottom of the center portion 32 of the housing 12. This port ar-rangement makes the pump 10 readily adaptable for connecting these two ports together so that the pump 10 can be used as a two stage pump.
Should this arrangement be desired the compressed fluid in the first chamber 14 would be routed via discharge port 3~ into intake port 40 and then into the second chamber 20 thereby providing additional two stage compression of the fluid and providing higher fluid pressures discharged through the second discharge port 42. An intermedia~e heat exchanger may be inserted in the flow following discharge port 11~4~23 38 and ahead of intake port 40 to remove the first stage heat of compression.
In Figure 2 a top view of the pump 10 is seen with end plates 62 of the pump 10 attached to the sides of the housing 12. In this view a top view of the intake port 36 and discharge port 42 are shown and as described under Figure 1. The end plates 62 of the pump 10 are attached by bolts 64 screwed into the sides of the housing 12.
The first rotor shaft 18 is shown having a first end portion 66 and a second end portion 68 extending from the housing 12. The first end portion 66 is connected to a drive motor which is not shown. The drive motor drives 10 the pump 10. A first drive pulley 70 is connected to the second end portion 68 of the first rotor shaft 18. The second rotor shaft 24 includes a first end portion 72 having a second drive pulley 74 attached thereto. The first rotor shaft 18 drives the second rotor shaft 24 by connecting the first drive pulley 70 and the second drive pulley 74 with a timing drive 76 or other synchronous drive means. An idler pulley 78 may be provided between first drive pulley 70 and second drive pulley 74 to control belt tension if a timing belt is used. Other types of synchronous drives such as gears, bar linkage or chains may not require tension control.
In Figure 3 a side view of the pump 10 is seen as shown in Figure 20 2. In this view the drive belt 76 can be seen attached to the first drive pulley 70 and the second drive pulley 74 with the idler pulley 78 positioned therebetween.
The first rotor shaft 18 and the second rotor shaft 24 are driven in the same direction as indicated by the arrows 60. Also it is understood that chain drives oould be used or any other method well known in the art for driving rotor shafts.
A~ -7-
Claims (5)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A fluid pump for compressing a working fluid therein, the pump comprising: a pump housing having a first end portion, a second end portion and a center portion; a first cylindrical chamber in the first end portion of said housing; a first cylindrical eccentric rotor positioned in said first chamber and rotatably attached to said housing; a first intake port in the center portion of said housing and connected to said first chamber;
a first discharge port in the center portion of said housing and connected to said first chamber; a second cylindrical chamber in the second end por-tion of said housing and parallel to said first chamber; a second cylindri-cal eccentric rotor positioned in said second chamber and rotatably attached to said housing; a second intake port in the center portion of said housing and connected to said second chamber; a second discharge port in the center portion of said housing and connected to said second chamber;
a rectangular shaped guideway in the center portion of said housing and therethrough, said guideway interconnecting said first chamber and said second chamber; a rectangular shaped floating block slidably received in said guideway, the ends of said block disposed adjacent a portion of the cylindrical surface of said first and said second rotors as said rotors rotate in said chambers, the sides of said block disposed adjacent said guideway, the width of said guideway sufficient to provide a clearance between the sides of said block and said guideway so that in operation the pressure differential between said first chamber and said second chamber causes leakage of a sufficient amount of the working fluid through the clearance between the sides of said block and said guideway to provide a fluid bearing therebetween; and drive means for rotating said first and second rotors in said first and second chambers.
a first discharge port in the center portion of said housing and connected to said first chamber; a second cylindrical chamber in the second end por-tion of said housing and parallel to said first chamber; a second cylindri-cal eccentric rotor positioned in said second chamber and rotatably attached to said housing; a second intake port in the center portion of said housing and connected to said second chamber; a second discharge port in the center portion of said housing and connected to said second chamber;
a rectangular shaped guideway in the center portion of said housing and therethrough, said guideway interconnecting said first chamber and said second chamber; a rectangular shaped floating block slidably received in said guideway, the ends of said block disposed adjacent a portion of the cylindrical surface of said first and said second rotors as said rotors rotate in said chambers, the sides of said block disposed adjacent said guideway, the width of said guideway sufficient to provide a clearance between the sides of said block and said guideway so that in operation the pressure differential between said first chamber and said second chamber causes leakage of a sufficient amount of the working fluid through the clearance between the sides of said block and said guideway to provide a fluid bearing therebetween; and drive means for rotating said first and second rotors in said first and second chambers.
2. The pump as described in claim 1 wherein clearance is provided between the ends of said floating block and the cylindrical surface of said first and second rotor so that in operation the pressure differential bet-ween the intake ports and the discharge ports in said chambers provides fluid pressure between the cylindrical portions of said first rotor and said second rotor and the ends of said floating block thereby providing a fluid bearing therebetween.
3. The pump as described in claim 2 wherein the surface of said float-ing block is comprised of a solid lubricant such as graphite, Teflon ( a trademark), molybdenum or the like, so that lubrication is provided between said block, the sides of said guideway, and the portions of the cylindrical surface of said first and second rotors contacted by the ends of said block during the startup of the pump.
4. The pump as described in claim 1 wherein said drive means comprises:
a first rotor shaft integrally attached to said first rotor, said first shaft rotatably mounted in said housing; a second rotor shaft integrally attached to said second rotor, said second shaft rotatably mounted in said housing; a drive motor attached to one end of said first shaft; and con-necting means attached to the opposite end of said first shaft and one end of said second shaft for rotating said second shaft when said first shaft is rotated by said drive motor.
a first rotor shaft integrally attached to said first rotor, said first shaft rotatably mounted in said housing; a second rotor shaft integrally attached to said second rotor, said second shaft rotatably mounted in said housing; a drive motor attached to one end of said first shaft; and con-necting means attached to the opposite end of said first shaft and one end of said second shaft for rotating said second shaft when said first shaft is rotated by said drive motor.
5. The pump as described in claim 4 wherein said connecting means may be a belt drive, gear drive, chain drive or the like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000331644A CA1144423A (en) | 1979-07-12 | 1979-07-12 | Fluid pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000331644A CA1144423A (en) | 1979-07-12 | 1979-07-12 | Fluid pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1144423A true CA1144423A (en) | 1983-04-12 |
Family
ID=4114668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000331644A Expired CA1144423A (en) | 1979-07-12 | 1979-07-12 | Fluid pump |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1144423A (en) |
-
1979
- 1979-07-12 CA CA000331644A patent/CA1144423A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |