CA1162172A - Cartridge rotary vane pump - Google Patents
Cartridge rotary vane pumpInfo
- Publication number
- CA1162172A CA1162172A CA000352270A CA352270A CA1162172A CA 1162172 A CA1162172 A CA 1162172A CA 000352270 A CA000352270 A CA 000352270A CA 352270 A CA352270 A CA 352270A CA 1162172 A CA1162172 A CA 1162172A
- Authority
- CA
- Canada
- Prior art keywords
- pump
- cartridge
- rotors
- chamber
- rotor
- 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
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- Rotary Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
A CARTRIDGE ROTARY VANE PUMP
ABSTRACT OF THE DISCLOSURE
A rotary vane vacuum pump includes a drive unit, such as an electric motor, and a pump unit, preferably constructed as a cartridge pump unit. The drive unit may take any suitable form, but the cartridge unit includes one or more pumping stages plus a pumping stage of small dimension to lower pressure and increase outgassing of the lubricant. The rotors of the rotary vane pump unit are shaftless, that is, they together form an axis of rotation without a separate axial shaft and are thus simplified in construction. All of the requirements of oiling, outgassing and gas ballast are fulfilled in the additional stage.
ABSTRACT OF THE DISCLOSURE
A rotary vane vacuum pump includes a drive unit, such as an electric motor, and a pump unit, preferably constructed as a cartridge pump unit. The drive unit may take any suitable form, but the cartridge unit includes one or more pumping stages plus a pumping stage of small dimension to lower pressure and increase outgassing of the lubricant. The rotors of the rotary vane pump unit are shaftless, that is, they together form an axis of rotation without a separate axial shaft and are thus simplified in construction. All of the requirements of oiling, outgassing and gas ballast are fulfilled in the additional stage.
Description
1 16217~
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to rotary vane pumps, and is particularly concerned with high vacuum rotary vane pumps which may be simply constructed in cartridge form.
Back~round of the Invention The construction of rotary vane pumps is wide and vari-ed, but basically all such pumps include one or more rotors which are rotatable in a like number of eccentrically disposed, serially connected pumping chambers which define a low pressure output side of the pump.
Various techniques for improving pump operation and pumping efficiency have heretofore been devised. For example, in my earlier United States Letters Patent 3,782,868, entitled "Rotary Vane Pump" I disclose structure for noise free lubri-cation o the pump.
In present high vacuum pumps oil for lubrication and leakage sealing is permitted to enter, in fact is drawn into, the exhaust stage of a pump and, due to occluded gasses, adverse-ly affects the pressure of the inlet stage to an intolerabledegree.
SUMMARY OF THE INVENTION
. _ .
The primary object of the invention is to provide a new and improved rotary vane vacuum pump.
Another object of the invention is to provide a vacuum pump of simple construction which may be cons~ructed as a cartridge type pump.
A particular object of the invention is to provide a pump cartridge which is readily adaptable to a plurality of pump structures. More specifically, this object includes the desire to provide an easily manufactured and assembled pump cartridge structure.
Another object of the invention is to provide a rotary vane vacuum pump which is virtually noise free, with respect to outgassing of the lubricant, without reguiring special addi-tional structures for noise suppression.
According to the invention, a pump of one or more stages, hereinafter referred to as 1+, 2+, etc. stag~s, is pro-vided with an additional stage, the (+) stage, of small axial dimension, whereby oil which is permitted to enter the inlet cycle becomes exposed to lower than normal pressure, thereby increasing the outgassing rate. This degassed oil is, in turn, flowed through the common stages allowing the pump to reach lower pressures at an increased rate of time.
Another feature of the invention is to provide, by way of the additional (+) stage, a constant gas ballast (air enter-ing the exhaust cycle to cleanse the lubricating oil) without adversely affecting the ultimate pressure of the pump. Also, a variable gas ballast with a more finite control should be provided.
2Q According to another feature of the invention, the additional stage, the (~) stage, permits a high vacuum rotary pump to be constructed in cartridge form with more reliable results.
Another feature of the invention is to provide a rotor structure which may be easily and simply constructed, preferably without a rotor shaft. In this preferable construction each rotor includes a central, axially extending threaded section which is received in an axial, threaaed bore of an associated section of the adjacent rotor.
BRIEF_~ESCRIPTION OF THE DRAWINGS
Other objects, features and advantages of the invention, its organization, ConstrUCtiGn and operation will become ap-parent and the invention will be best understood from the following detailed description, taken with the accompanying drawings, on which:
Figure l is a perspective view of a pump constructed in accordance with the present invention;
Figure 2 is an elevational sectional view of a pump constructed in accordance with the present inventi.on;
Figure 3 is an elevational sectional view of a car-tridge of a pump constructed in accordance with the invention;
Figure 4 is an exploded view of a 2 + l pump rotoraccording to the invention;
Figure 5 is a trap-end view of the cartridge of Figure 3 taken along the line V - ~ V;
Figure 6 is a sectional view taken along the line VI - - VI of Figure 3;
Figure 7 is a sectional view taken along the line VII - - VII of Figure 3;
Figure 8 is a sectional view taken along the line VIII - - VIII of Figure 3:
Figure 9 is a sectional view taken along the line IX - - IX of Figure 3;
Figure 10 is a sectional view taken along the line X - - X of Figure 3;
Figure ll is a sectional view of the structure taken along the line XI - - XI of Figure 3;
Figure 12 is a drive end view taken along the line XII - - XII of Figure 3; and Figure 13 is a perspective view of the vane structure.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to Figures l, 2, and 3, a pump 10 that is 1 1~2172 an electric motor, is illustrated as comprising a prime mover 12, having an output shaft 14 which extends into a pump housing 16 through an aperture 18 via a seal 20.
The housing 16 has a cover 22 and together therewith defines a chamber 24 which receives and mounts therein a pump cartridge 26. The pump cartridge 26 includes a first end plate 28 tFigures 2 and 5) having a recess 30 therein which is in fluid communication with a conduit 32 through a port 34 (also see Figure 13). In the specific embodiment illustrated three pumping chamhers 36, 38, and 40 are connected in fluid communi-cation with the recess 30, as illustrated in Figures 9, 10, and 11, respectively, by way of a plurality of intermediate plates 42, 44, and 46.
Each of the chambers 36, 38, and 40 are defined by respective bores in respective stators 48, 50, and 52 while:
the plate 42 (Figure 6) includes a recess 54 and a bore 56 communicating between the recess 30 and the chamber 36; the plate 44 in~ludes a bore (not shown) communicating the chamber 36 with the chamber 38; and the plate 46, an outgassing exhaust end plate, includes a bore 58 communicating the chamber 38 with a port 114 in an end plate 62 (Figure 8), and with a port 64 (Figure 11). Each of the bores in the stators communicates through recesses relieved in the faces of the stators, as is common practice. Each of the plates and stators includes a notch 66 (see Figures 8 and 9 for example) therein for alignment during assembly and each includes a plurality of bores 68 for receiving a fastener 70 therein such as a bolt, rivit or the like.
The pumping chamher 36 in the stator 48 has a rotor 72 therein; the pumping chamber 38 in the stator 50 has a rotor 74 therein; and the pumping chamber 40 in the stator 52 has a rotor 1 1~2~72 76, the (+) rotor, therein. As illustrated, for example, Figure 10, each of the rotors 72, 74, and 76 has at least one radially directed slot 78 therein which receives a slideable vane 80 which is spring loaded, as at 82, (Figure 5) the spring 82 being on a pin 83 received in a bore 83.
Referring to Figure 4, a particular feature of the invention is illustrated, in the context of the embodiment of Figures 1, 2, and 3. In Figure 4, a first rotor 72 is illu-strated as including an axial projection 84 for rotational re-ception in a bore 86 in the plate 42 and a threaded axial recess88 for receiving a threaded axial projection 90 of the rotor 74.
The rotor 74 also includes a threaded axial bore 92 which receives a threaded projection 94 of the rotor 76 which also has an axial projection 96 which is adapted at 98 for driving connection to the output shaft 14 of the prime mover 12. The rotors are therefore constructed for a shaftless assembly which greatly simplifies assembly and final machining of the com-ponents.
After assembly of the cartridge 26, the same may be coupled to the drive shaft 14 and removably mounted in the chamber 24, as illustrated in Figure 2, a pair of machine screws (not shown) which extend downwardly through a pair of bores 102 in a pair of bosses 104 as seen in Figures 1, 10, and 12.
As shown in Figure 4, each of the rotors has at least one axial projection or collar 106 which abuts a facing collar 108 of the adjacent rotor to space the rotors so as to receive the intermediate plates therebetween. It is readily apparent from the structure of Figures 3 and 4 that finishing and balanc-ing of a rotor assembly is greatly simplified by the present invention in that there is no rotor shaft per se as a separate part and therefore no force fit of rotors on a shaft and no cracking or rotor-shaft slippage. If the rotor assembly is to be driven from the intake end, opposite thread direction may be used.
As previously mentioned, high vacuum pumps require oil for lubrication. In the present invention the chamber 24 may advantageously be a reservoir for lubricating oil as well as a reposi~ory for the cartridge 26. The added stage, the (+) stage including the rotor 76, which permits the oil to enter the cartridge through a passageway 116 in the end plate 62 during the inlet cycle, creates an extremely low pressure in the exhaust stage and exposes the lubricating oil to this pres-sure to increase outgassing. The degassed oil then is flowed through all of the small spaces of the cartridge for lubrication of the stages. A constant gas ballast (air entering the exhaust cycle to cleanse the oil) is therefore established without ad-versely affecting the ultimate pressure of the pump. This ballast may be adjusted by a needle valve (not shown) in the valve passageway 110 in Figure 8 which has a valve seat 112 in communication with a slot 114 which extends to the exterior of the cartridge.
In summary, the oiling, gas ballast and degassing requirements of high vacuum rotary vane pumps have been provided in a pump, in particular a pump cartridge, not in a manner here-tofore conventional where each requirement was fulfilled at various locations in a pump, but uniquely all requirements are met in a single stage, the (+) stage. This novel construction advantageously lends itself to cartridge form and the unique cartridge structure, including the novel rotor arrangement, simplifies production and makes refurbrishing fast, easy and economical.
1 1$2~72 Although I have described my invention by reference to a particular illustrative embodiment thereof, many changes and modifications may become apparent to those skilled in the art without departing from the spirit and scope of the invention.
I therefore intend to include within the patent warranted here-on all such changes and modifications as may reasonably and properly be included within the scope of my contribution to the art.
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to rotary vane pumps, and is particularly concerned with high vacuum rotary vane pumps which may be simply constructed in cartridge form.
Back~round of the Invention The construction of rotary vane pumps is wide and vari-ed, but basically all such pumps include one or more rotors which are rotatable in a like number of eccentrically disposed, serially connected pumping chambers which define a low pressure output side of the pump.
Various techniques for improving pump operation and pumping efficiency have heretofore been devised. For example, in my earlier United States Letters Patent 3,782,868, entitled "Rotary Vane Pump" I disclose structure for noise free lubri-cation o the pump.
In present high vacuum pumps oil for lubrication and leakage sealing is permitted to enter, in fact is drawn into, the exhaust stage of a pump and, due to occluded gasses, adverse-ly affects the pressure of the inlet stage to an intolerabledegree.
SUMMARY OF THE INVENTION
. _ .
The primary object of the invention is to provide a new and improved rotary vane vacuum pump.
Another object of the invention is to provide a vacuum pump of simple construction which may be cons~ructed as a cartridge type pump.
A particular object of the invention is to provide a pump cartridge which is readily adaptable to a plurality of pump structures. More specifically, this object includes the desire to provide an easily manufactured and assembled pump cartridge structure.
Another object of the invention is to provide a rotary vane vacuum pump which is virtually noise free, with respect to outgassing of the lubricant, without reguiring special addi-tional structures for noise suppression.
According to the invention, a pump of one or more stages, hereinafter referred to as 1+, 2+, etc. stag~s, is pro-vided with an additional stage, the (+) stage, of small axial dimension, whereby oil which is permitted to enter the inlet cycle becomes exposed to lower than normal pressure, thereby increasing the outgassing rate. This degassed oil is, in turn, flowed through the common stages allowing the pump to reach lower pressures at an increased rate of time.
Another feature of the invention is to provide, by way of the additional (+) stage, a constant gas ballast (air enter-ing the exhaust cycle to cleanse the lubricating oil) without adversely affecting the ultimate pressure of the pump. Also, a variable gas ballast with a more finite control should be provided.
2Q According to another feature of the invention, the additional stage, the (~) stage, permits a high vacuum rotary pump to be constructed in cartridge form with more reliable results.
Another feature of the invention is to provide a rotor structure which may be easily and simply constructed, preferably without a rotor shaft. In this preferable construction each rotor includes a central, axially extending threaded section which is received in an axial, threaaed bore of an associated section of the adjacent rotor.
BRIEF_~ESCRIPTION OF THE DRAWINGS
Other objects, features and advantages of the invention, its organization, ConstrUCtiGn and operation will become ap-parent and the invention will be best understood from the following detailed description, taken with the accompanying drawings, on which:
Figure l is a perspective view of a pump constructed in accordance with the present invention;
Figure 2 is an elevational sectional view of a pump constructed in accordance with the present inventi.on;
Figure 3 is an elevational sectional view of a car-tridge of a pump constructed in accordance with the invention;
Figure 4 is an exploded view of a 2 + l pump rotoraccording to the invention;
Figure 5 is a trap-end view of the cartridge of Figure 3 taken along the line V - ~ V;
Figure 6 is a sectional view taken along the line VI - - VI of Figure 3;
Figure 7 is a sectional view taken along the line VII - - VII of Figure 3;
Figure 8 is a sectional view taken along the line VIII - - VIII of Figure 3:
Figure 9 is a sectional view taken along the line IX - - IX of Figure 3;
Figure 10 is a sectional view taken along the line X - - X of Figure 3;
Figure ll is a sectional view of the structure taken along the line XI - - XI of Figure 3;
Figure 12 is a drive end view taken along the line XII - - XII of Figure 3; and Figure 13 is a perspective view of the vane structure.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to Figures l, 2, and 3, a pump 10 that is 1 1~2172 an electric motor, is illustrated as comprising a prime mover 12, having an output shaft 14 which extends into a pump housing 16 through an aperture 18 via a seal 20.
The housing 16 has a cover 22 and together therewith defines a chamber 24 which receives and mounts therein a pump cartridge 26. The pump cartridge 26 includes a first end plate 28 tFigures 2 and 5) having a recess 30 therein which is in fluid communication with a conduit 32 through a port 34 (also see Figure 13). In the specific embodiment illustrated three pumping chamhers 36, 38, and 40 are connected in fluid communi-cation with the recess 30, as illustrated in Figures 9, 10, and 11, respectively, by way of a plurality of intermediate plates 42, 44, and 46.
Each of the chambers 36, 38, and 40 are defined by respective bores in respective stators 48, 50, and 52 while:
the plate 42 (Figure 6) includes a recess 54 and a bore 56 communicating between the recess 30 and the chamber 36; the plate 44 in~ludes a bore (not shown) communicating the chamber 36 with the chamber 38; and the plate 46, an outgassing exhaust end plate, includes a bore 58 communicating the chamber 38 with a port 114 in an end plate 62 (Figure 8), and with a port 64 (Figure 11). Each of the bores in the stators communicates through recesses relieved in the faces of the stators, as is common practice. Each of the plates and stators includes a notch 66 (see Figures 8 and 9 for example) therein for alignment during assembly and each includes a plurality of bores 68 for receiving a fastener 70 therein such as a bolt, rivit or the like.
The pumping chamher 36 in the stator 48 has a rotor 72 therein; the pumping chamber 38 in the stator 50 has a rotor 74 therein; and the pumping chamber 40 in the stator 52 has a rotor 1 1~2~72 76, the (+) rotor, therein. As illustrated, for example, Figure 10, each of the rotors 72, 74, and 76 has at least one radially directed slot 78 therein which receives a slideable vane 80 which is spring loaded, as at 82, (Figure 5) the spring 82 being on a pin 83 received in a bore 83.
Referring to Figure 4, a particular feature of the invention is illustrated, in the context of the embodiment of Figures 1, 2, and 3. In Figure 4, a first rotor 72 is illu-strated as including an axial projection 84 for rotational re-ception in a bore 86 in the plate 42 and a threaded axial recess88 for receiving a threaded axial projection 90 of the rotor 74.
The rotor 74 also includes a threaded axial bore 92 which receives a threaded projection 94 of the rotor 76 which also has an axial projection 96 which is adapted at 98 for driving connection to the output shaft 14 of the prime mover 12. The rotors are therefore constructed for a shaftless assembly which greatly simplifies assembly and final machining of the com-ponents.
After assembly of the cartridge 26, the same may be coupled to the drive shaft 14 and removably mounted in the chamber 24, as illustrated in Figure 2, a pair of machine screws (not shown) which extend downwardly through a pair of bores 102 in a pair of bosses 104 as seen in Figures 1, 10, and 12.
As shown in Figure 4, each of the rotors has at least one axial projection or collar 106 which abuts a facing collar 108 of the adjacent rotor to space the rotors so as to receive the intermediate plates therebetween. It is readily apparent from the structure of Figures 3 and 4 that finishing and balanc-ing of a rotor assembly is greatly simplified by the present invention in that there is no rotor shaft per se as a separate part and therefore no force fit of rotors on a shaft and no cracking or rotor-shaft slippage. If the rotor assembly is to be driven from the intake end, opposite thread direction may be used.
As previously mentioned, high vacuum pumps require oil for lubrication. In the present invention the chamber 24 may advantageously be a reservoir for lubricating oil as well as a reposi~ory for the cartridge 26. The added stage, the (+) stage including the rotor 76, which permits the oil to enter the cartridge through a passageway 116 in the end plate 62 during the inlet cycle, creates an extremely low pressure in the exhaust stage and exposes the lubricating oil to this pres-sure to increase outgassing. The degassed oil then is flowed through all of the small spaces of the cartridge for lubrication of the stages. A constant gas ballast (air entering the exhaust cycle to cleanse the oil) is therefore established without ad-versely affecting the ultimate pressure of the pump. This ballast may be adjusted by a needle valve (not shown) in the valve passageway 110 in Figure 8 which has a valve seat 112 in communication with a slot 114 which extends to the exterior of the cartridge.
In summary, the oiling, gas ballast and degassing requirements of high vacuum rotary vane pumps have been provided in a pump, in particular a pump cartridge, not in a manner here-tofore conventional where each requirement was fulfilled at various locations in a pump, but uniquely all requirements are met in a single stage, the (+) stage. This novel construction advantageously lends itself to cartridge form and the unique cartridge structure, including the novel rotor arrangement, simplifies production and makes refurbrishing fast, easy and economical.
1 1$2~72 Although I have described my invention by reference to a particular illustrative embodiment thereof, many changes and modifications may become apparent to those skilled in the art without departing from the spirit and scope of the invention.
I therefore intend to include within the patent warranted here-on all such changes and modifications as may reasonably and properly be included within the scope of my contribution to the art.
Claims
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
A vacuum pump comprising:
a pump housing having a pump cartridge receiving chamber with an open top, said chamber defining an oil reservoir and including means for receiving a prime mover having a drive shaft extending into said chamber;
a pump cartridge including at least one pumping stage and having a rotary shaft for operation of said pumping stage, said rotary shaft including intercoupling means at an end thereof;
coupling means for releasably coupling said drive shaft of said prime mover to said rotary shaft of said pump cartridge, said coupling secured to said drive shaft and including interengaging means for releasably engaging said intercoupling means at an end of said rotary shaft for permit-ting quick connecting and disconnecting of said pump cartridge to said prime mover, said interengaging means and said inter-coupling means being positioned within said chamber whereby said cartridge can be removed by lifting from said chamber without draining oil therefrom; and cover means for removably covering said open top of said housing permitting access to said chamber.
The pump as defined in claim 1 wherein said intercoupling means comprises one of a pin or slot and said interengaging means comprises the other of a pin or slot.
The pump as defined in claim 2 wherein said coupling means comprises a sleeve fitted over and secured to said drive shaft.
The pump as defined in claim 1 wherein said cartridge comprises:
a cartridge housing including chamber means defining a plurality of pumping chambers which are serially-connected in fluid communication;
a fluid inlet at a first end of one of said pumping chambers;
a fluid outlet at a second end of one of said pumping chambers;
a plurality of serially-connected rotors mounted for rotation about a shaftless axis in respective ones of said chambers;
one of said rotors at one of said ends of said chambers including said rotary shaft and said intercoupling means; and each of said rotors including interengagement means connecting that rotor to each adjacent rotor.
The pump as defined in claim 4 wherein said cartridge housing comprises:
a plurality of end plates journaling said rotors for rotation;
a plurality of pump stator plates each including a bore in which the respective rotor is disposed; and a center plate intermediate adjacent stator plates defining with said stators and end plates, said pumping chambers The pump as defined in claim 5 wherein each of said end, center and stator plates having similar peripheral dimensions and alignment indicia for proper orientation thereof during assembly.
The pump as defined in claim 6 wherein said indicia comprises an identical notch in each plate forming a continuous groove across all of said plates.
The pump as defined in claim 7 wherein one of said adjacent rotors includes an axially-projecting threaded stud and the other of said rotors includes an axially-aligned threaded bore for threadedly engaging said threaded stud to provide interengagement of and shaftless rotation of said rotors.
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
A vacuum pump comprising:
a pump housing having a pump cartridge receiving chamber with an open top, said chamber defining an oil reservoir and including means for receiving a prime mover having a drive shaft extending into said chamber;
a pump cartridge including at least one pumping stage and having a rotary shaft for operation of said pumping stage, said rotary shaft including intercoupling means at an end thereof;
coupling means for releasably coupling said drive shaft of said prime mover to said rotary shaft of said pump cartridge, said coupling secured to said drive shaft and including interengaging means for releasably engaging said intercoupling means at an end of said rotary shaft for permit-ting quick connecting and disconnecting of said pump cartridge to said prime mover, said interengaging means and said inter-coupling means being positioned within said chamber whereby said cartridge can be removed by lifting from said chamber without draining oil therefrom; and cover means for removably covering said open top of said housing permitting access to said chamber.
The pump as defined in claim 1 wherein said intercoupling means comprises one of a pin or slot and said interengaging means comprises the other of a pin or slot.
The pump as defined in claim 2 wherein said coupling means comprises a sleeve fitted over and secured to said drive shaft.
The pump as defined in claim 1 wherein said cartridge comprises:
a cartridge housing including chamber means defining a plurality of pumping chambers which are serially-connected in fluid communication;
a fluid inlet at a first end of one of said pumping chambers;
a fluid outlet at a second end of one of said pumping chambers;
a plurality of serially-connected rotors mounted for rotation about a shaftless axis in respective ones of said chambers;
one of said rotors at one of said ends of said chambers including said rotary shaft and said intercoupling means; and each of said rotors including interengagement means connecting that rotor to each adjacent rotor.
The pump as defined in claim 4 wherein said cartridge housing comprises:
a plurality of end plates journaling said rotors for rotation;
a plurality of pump stator plates each including a bore in which the respective rotor is disposed; and a center plate intermediate adjacent stator plates defining with said stators and end plates, said pumping chambers The pump as defined in claim 5 wherein each of said end, center and stator plates having similar peripheral dimensions and alignment indicia for proper orientation thereof during assembly.
The pump as defined in claim 6 wherein said indicia comprises an identical notch in each plate forming a continuous groove across all of said plates.
The pump as defined in claim 7 wherein one of said adjacent rotors includes an axially-projecting threaded stud and the other of said rotors includes an axially-aligned threaded bore for threadedly engaging said threaded stud to provide interengagement of and shaftless rotation of said rotors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000352270A CA1162172A (en) | 1980-05-20 | 1980-05-20 | Cartridge rotary vane pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000352270A CA1162172A (en) | 1980-05-20 | 1980-05-20 | Cartridge rotary vane pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1162172A true CA1162172A (en) | 1984-02-14 |
Family
ID=4116995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000352270A Expired CA1162172A (en) | 1980-05-20 | 1980-05-20 | Cartridge rotary vane pump |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1162172A (en) |
-
1980
- 1980-05-20 CA CA000352270A patent/CA1162172A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |