EP0128579A1 - Pump for selectively feeding the front windscreen washer and rear window washer of a vehicle - Google Patents
Pump for selectively feeding the front windscreen washer and rear window washer of a vehicle Download PDFInfo
- Publication number
- EP0128579A1 EP0128579A1 EP84106693A EP84106693A EP0128579A1 EP 0128579 A1 EP0128579 A1 EP 0128579A1 EP 84106693 A EP84106693 A EP 84106693A EP 84106693 A EP84106693 A EP 84106693A EP 0128579 A1 EP0128579 A1 EP 0128579A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- impeller
- washer
- duct
- delivery
- 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.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
- F04D29/50—Fluid-guiding means, e.g. diffusers adjustable for reversing fluid flow
- F04D29/506—Fluid-guiding means, e.g. diffusers adjustable for reversing fluid flow especially adapted for liquid pumps
Definitions
- This invention relates to a pump for selectively feeding the front windscreen washer and rear window washer of a vehicle, in particular a motor vehicle.
- the front windscreen and rear window washers of a vehicle are currently fed with wash liquid by two different pumps driven by respective electric motors controlled by one or two switches situated inside the vehicle, and arranged to withdraw the wash liquid from the inside of a container common to both washers in order to feed it to these latter through suitable tubes.
- this method requires special pumps to be constructed in which the pump casing is provided with the space necessary for housing the wing valve, can lead to local pressure drops and/or disturbances in the flow of wash fluid through the pump, and in particular requires the construction of pumps in which the two delivery ducts face each other and are coaxial, so as to be able to be alternately closed by the same valve.
- This latter drawback can create space problems in a situation in which it would be preferable for the two delivery duets not to be coaxial but, for example, to be disposed offset at an angle to each other.
- the object of the present invention is to provide a pump for selectively feeding the front windscreen washer and rear window washer of a vehicle, of the type heretofore described, ie provided with a reversible motor, which is free from the aforesaid drawbacks and in particular is of reliable operation and able to allow the opposing delivery ducts to assume any arrangement relative to each other, and moreover is provided with an impeller chamber which is occupied only by the impeller itself.
- a pump for selectively feeding the front windscreen washer and rear window washer of a vehicle in particular a motor vehicle, of the type comprising a substantially cylindrical pump easing provided with an axial suction duct and two substantially tangential delivery duets, and with an impeller housed inside said pump casing and disposed coaxial to said suction duct, said impelier being arranged for operation by a revereible motor controlled by a switch, cbarac- terised in that each of said delivery ducts is provided with an automatic non-return valve, said non-return valves being arranged to selectively allow a unidirectional flow in one of said delivery ducts in accordance with the direction of rotation of said impeller.
- the reference numeral 1 indicates overall a pump for selectively feeding a wash liquid, for example a solution of water and detergent contained in a vessel la illustrated by dashed lines and on which the pump 1 is fixed, to a known front windscreen washer and rear window washer, not shown, of any known vehicle, also not shown, for example a motor vehicle.
- the pump 1 comprises a substantially cylindrical pump casing 2 defining internally a pump chamber 3 and provided with an axial suction duct 4 and two opposing tangential delivery ducts 5, 6 respectively, and an impeller 7 housed in the casing 2 inside the chamber 3, and disposed coaxial to said duct 4.
- the impeller 7 comprises a plurality of radial blades 8 (four in the illustrated example) preferably fixed on to and angularly rigid with a rotary shaft 9 supported by suitable known bearings, not shown, and coupled in an angularly rigid known manner, not shown, to a reversible motor, preferably electric, indicated by 10 in Figure 2.
- the motor 10 is coaxial to the shaft 9 and duct 4, and is controlled by a switch indicated overall by 11 in Figure 2, to be operated by the vehicle user and situated for example inside the passenger compartment thereof, the impeller 7 being arranged for reversible operation by the motor 10, ie in both directions of rotation illustrated by the arrows in Figures 1 and 2.
- the casing 2 and motor 10 are preferably mounted coaxial on the outside of the Vessel la, and the chamber 3 is connected to the interior of this latter by the duct 4.
- the duets 5 and 6 are preferably integral with the casing 3, for example of plastics construction, and each comprises opposing ends 12 and 13 which terminate respectively in the chamber 3 inside the pump casing 2 and at a respective connection nipple 14.
- the nipples 14 are integral with the ducts 5 and 6 at the end of these latter, and can be connected in a fluid-tight manner to respective flexible pipes, not shown, connected respectively to said front windscreen washer and rear window washer.
- the dicts 5 and 6 are also each provided with a respective automatic non-return valve 15 arranged to selectively allow a unidirectional flow in the respective delivery duct 5 or 6 in accordance with the direction of rotation of the impeller 7.
- Each valve 15 comprises a housing 16 provided in the corresponding delivery duct 5 or 6 between the opposing ends 12 and 13 thereof, and constituted by a widening-out thereof, a valve ball 18 housed mobile in the respective housing 16 and arranged to cooperate in a fluid-tight manner with a respective valve seat 19 provided in the housing 16 on that side facing the pump casing 2, and preferably a helical spring 20, for example conical, arranged to retain the ball 18 against the respective seat 19 under predetermined presaure.
- the valves 15 comprise springs 20 of such a rating as to require an opening pressure of between approximately 0.3 and 0.4 kg/cm 2 , so as to open only when in the respective end 12 there is exerted an overpressure of this extent by virtue of the movement of the impeller 7.
- the switch 11 can comprise a change-over switching mechanism 21 arranged to connect respective pairs of contacts 23 and 24 to respective feed terminals 22 in order to feed a feed circuit 25 for the motor 10.
- the change-ever switching mechanism 21 can obviously assume three positions, namely a neutral position shown in Figure 2 in which it does not connect either of the pairs of contacts 23 or 24 to the terminals 22, a first switching position in which it connects the terminals 22 to the pair of contacts 23 in order to cause the motor 10 to rotate in a predetermined direction, and a second switching position in which it connects the terminals 22 to the pair of contacts 24 in order to cause the motor 10 to rotate in the opposite direction.
- the operation of the pump 1 heretofore described is as follows.
- the motor 10 rotates, for example clockwise, to drive the impeller 7 in the same direction of rotation so that it centrifunes the liquid contained in the compartment 3 towards the end 12 of the duct 6, while at the same time drawing new liquid from the interior of the vessel la through the duct 4.
- This fluid movement produced by the impeller 7 obviously produces an increase in pressure at the end 12 of the duct 6 and a decrease in pressure at the end 12 of the duct 5. Consequently the valve 15 of the duct 6 opens to allow feed to the end 13 and thus to the rear window washer, whereas the valve 15 of the duct 5 increases its own closure pressure and prevents any feed of detergent liquid to the front windscreen washer.
- the switch 11 is switched-over by moving the change-over switching mechanism 21 in such a manner as to connect the pair of contacts 24 to the terminals 22.
- the motor 10 and impeller 7 are rotated anti-clockwise in order, as heretofore described, to create an overpressure at the end 12 of the duct 5, which causes opening of the relative valve 15, thus feeding the front windscreen washer through the end 13.
- FIG 3 shows a possible modification 30 of the pump 1 of Figure I, parts similar or equal to those already described being indicated for simplicity by the same reference numerals.
- the pump 30 differs from the pump 1 by the arrangement of the ducts 5 and 6, which instead of being disposed tangentia1 to the chamber 3 and coaxial and facing each other, they are disposed parallel and side- by-side, so that the two ends project from the same portion 31 of the casing 3. In this manner, the pump 30 has a reduced overall size and in any case much less than that of the pump 1.
- the balls 18 of the valves 15 of the pump 30 can be retained against the respective valve seats 19 by springs analogous to the springs 20, or alternatively, as shown in Figure 3, they can be fixed rigidly to suitably pre-loaded helical tension springs 3? fixed to the opposing ends of an equaliser rod 33 connected to the portion 31 of the casing 3.
- the operation of the pump 30 is identical to the operation of the numn 1 as heretofore described, and requires a feed circuit 25 and switch 11 such as those described.
- the pressure increase at the end 12 of one of the ducts 5 and 6 causes the relative valve 15 to open and place the spring 32 under tension, whereas the other valve 19 remains closed.
- the pump of the present invention is of lower cost and simpler construction, in that the pump casino is substantially the same as the casing of current single-delivery pumps (ie having only one delivery duct), and does not use a special automatic valve, but instead uses common commercially available non-return valves which are of reliable operation, of very low cost and very light in weight.
- the pump compartement is kept completely free of any supplementary device and is occupied only by the impeller, thus preventing the creation of disturbances to the flow of wash fluid and/or creating local pressure drops.
- the delivery ducts 5 or 6 it is not necessary for the delivery ducts 5 or 6 to be perfectly tangential, coaxial and facing each other, as in the case of known reversible pumps, but instead they can be disposed on the same side, as in Figure 3, or offset and oblique to each other, ie inclined at a certain angle, according to the design space requirements to be satisfied at any given time.
- the presence of two separate valves each disposed in a respective duct allows widest possible design freedom in the arrangement of these latter, in contrast to known reversible pumps.
- the pump 1 can be volumetric or centrifugal
- the impeller 7 could also be of the mobile blade, positive displacement or any other known type.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
- This invention relates to a pump for selectively feeding the front windscreen washer and rear window washer of a vehicle, in particular a motor vehicle.
- The front windscreen and rear window washers of a vehicle are currently fed with wash liquid by two different pumps driven by respective electric motors controlled by one or two switches situated inside the vehicle, and arranged to withdraw the wash liquid from the inside of a container common to both washers in order to feed it to these latter through suitable tubes. In order to reduce the cost and weight of the aforesaid feed device for the windscreen and rear window washers of a vehicle, it has been proposed to use a single pump driven by a reversible motor and provided with two opposing coaxial facing delivery ducts arranged to be selectively opened or closed, according to the direction of rotation of the pump impeller, by means of an automatic wing valve disposed in the pump chamber occupied by the impeller and bounded by the pump casing, and hinged coaxial with the impeller itself. Although this method enables a single pump driven by a single motor to be used, it is not totally reliable in that the wing valve is not always instantly operated by the fluid flow produced by the impeller and/or by a suitable control system. Moreover, this method requires special pumps to be constructed in which the pump casing is provided with the space necessary for housing the wing valve, can lead to local pressure drops and/or disturbances in the flow of wash fluid through the pump, and in particular requires the construction of pumps in which the two delivery ducts face each other and are coaxial, so as to be able to be alternately closed by the same valve. This latter drawback can create space problems in a situation in which it would be preferable for the two delivery duets not to be coaxial but, for example, to be disposed offset at an angle to each other. The object of the present invention is to provide a pump for selectively feeding the front windscreen washer and rear window washer of a vehicle, of the type heretofore described, ie provided with a reversible motor, which is free from the aforesaid drawbacks and in particular is of reliable operation and able to allow the opposing delivery ducts to assume any arrangement relative to each other, and moreover is provided with an impeller chamber which is occupied only by the impeller itself.
- The aforesaid objects are attained according to the present invention by a pump for selectively feeding the front windscreen washer and rear window washer of a vehicle, in particular a motor vehicle, of the type comprising a substantially cylindrical pump easing provided with an axial suction duct and two substantially tangential delivery duets, and with an impeller housed inside said pump casing and disposed coaxial to said suction duct, said impelier being arranged for operation by a revereible motor controlled by a switch, cbarac- terised in that each of said delivery ducts is provided with an automatic non-return valve, said non-return valves being arranged to selectively allow a unidirectional flow in one of said delivery ducts in accordance with the direction of rotation of said impeller. The present invention will be more apparent from the non-limiting description of two embodiments with reference to the accompanying drawings in which:
- Figure 1 is a cross-section through a pump in accordance with the present invention;
- Figure 2 shows a simplified control scheme for the pump of Figure 1: and
- Figure 3 shows a modification of the pump of Figure 1.
- In Figure 1, the reference numeral 1 indicates overall a pump for selectively feeding a wash liquid, for example a solution of water and detergent contained in a vessel la illustrated by dashed lines and on which the pump 1 is fixed, to a known front windscreen washer and rear window washer, not shown, of any known vehicle, also not shown, for example a motor vehicle. The pump 1 comprises a substantially
cylindrical pump casing 2 defining internally apump chamber 3 and provided with anaxial suction duct 4 and two opposingtangential delivery ducts impeller 7 housed in thecasing 2 inside thechamber 3, and disposed coaxial to saidduct 4. Theimpeller 7 comprises a plurality of radial blades 8 (four in the illustrated example) preferably fixed on to and angularly rigid with arotary shaft 9 supported by suitable known bearings, not shown, and coupled in an angularly rigid known manner, not shown, to a reversible motor, preferably electric, indicated by 10 in Figure 2. Themotor 10 is coaxial to theshaft 9 andduct 4, and is controlled by a switch indicated overall by 11 in Figure 2, to be operated by the vehicle user and situated for example inside the passenger compartment thereof, theimpeller 7 being arranged for reversible operation by themotor 10, ie in both directions of rotation illustrated by the arrows in Figures 1 and 2. Thecasing 2 andmotor 10 are preferably mounted coaxial on the outside of the Vessel la, and thechamber 3 is connected to the interior of this latter by theduct 4. - The
duets casing 3, for example of plastics construction, and each comprisesopposing ends chamber 3 inside thepump casing 2 and at arespective connection nipple 14. Thenipples 14 are integral with theducts - According to the invention, the
dicts automatic non-return valve 15 arranged to selectively allow a unidirectional flow in therespective delivery duct impeller 7. - Each
valve 15 comprises ahousing 16 provided in thecorresponding delivery duct opposing ends valve ball 18 housed mobile in therespective housing 16 and arranged to cooperate in a fluid-tight manner with arespective valve seat 19 provided in thehousing 16 on that side facing thepump casing 2, and preferably ahelical spring 20, for example conical, arranged to retain theball 18 against therespective seat 19 under predetermined presaure. Preferably, thevalves 15 comprisesprings 20 of such a rating as to require an opening pressure of between approximately 0.3 and 0.4 kg/cm2, so as to open only when in therespective end 12 there is exerted an overpressure of this extent by virtue of the movement of theimpeller 7. As shown in Figure 2, theswitch 11 can comprise a change-overswitching mechanism 21 arranged to connect respective pairs ofcontacts respective feed terminals 22 in order to feed afeed circuit 25 for themotor 10. The change-everswitching mechanism 21 can obviously assume three positions, namely a neutral position shown in Figure 2 in which it does not connect either of the pairs ofcontacts terminals 22, a first switching position in which it connects theterminals 22 to the pair ofcontacts 23 in order to cause themotor 10 to rotate in a predetermined direction, and a second switching position in which it connects theterminals 22 to the pair ofcontacts 24 in order to cause themotor 10 to rotate in the opposite direction. The operation of the pump 1 heretofore described is as follows. When theswitch 11 is in the position shown in Figure 2 themotor 10 is at rest and consequently theimpeller 7 is at rest and the pump 1 is not working. Both theducts respective valves 15, even if the pump 1 is disposed below the liquid level and is thus constantly filled with the liquid contained in the vessel la. Thus in such a position it is not necessary, because of thevalves 15, to provide the pump 1 with any further shut-off valve, for example in theduct 4. On operating theswitch 11, the user is able to cause the pump 1 to selectively feed the front windscreen washer or rear window washer, which are connected respectively to theducts switch 11 connects theterminals 22 to thecontacts 23, themotor 10 rotates, for example clockwise, to drive theimpeller 7 in the same direction of rotation so that it centrifunes the liquid contained in thecompartment 3 towards theend 12 of theduct 6, while at the same time drawing new liquid from the interior of the vessel la through theduct 4. This fluid movement produced by theimpeller 7 obviously produces an increase in pressure at theend 12 of theduct 6 and a decrease in pressure at theend 12 of theduct 5. Consequently thevalve 15 of theduct 6 opens to allow feed to theend 13 and thus to the rear window washer, whereas thevalve 15 of theduct 5 increases its own closure pressure and prevents any feed of detergent liquid to the front windscreen washer. In order to feed detergent liquid to this latter, theswitch 11 is switched-over by moving the change-overswitching mechanism 21 in such a manner as to connect the pair ofcontacts 24 to theterminals 22. In this case, themotor 10 andimpeller 7 are rotated anti-clockwise in order, as heretofore described, to create an overpressure at theend 12 of theduct 5, which causes opening of therelative valve 15, thus feeding the front windscreen washer through theend 13. - Figure 3 shows a
possible modification 30 of the pump 1 of Figure I, parts similar or equal to those already described being indicated for simplicity by the same reference numerals. Specifically, thepump 30 differs from the pump 1 by the arrangement of theducts chamber 3 and coaxial and facing each other, they are disposed parallel and side- by-side, so that the two ends project from the same portion 31 of thecasing 3. In this manner, thepump 30 has a reduced overall size and in any case much less than that of the pump 1. Theballs 18 of thevalves 15 of thepump 30 can be retained against therespective valve seats 19 by springs analogous to thesprings 20, or alternatively, as shown in Figure 3, they can be fixed rigidly to suitably pre-loadedhelical tension springs 3? fixed to the opposing ends of anequaliser rod 33 connected to the portion 31 of thecasing 3. - The operation of the
pump 30 is identical to the operation of the numn 1 as heretofore described, and requires afeed circuit 25 and switch 11 such as those described. The pressure increase at theend 12 of one of theducts relative valve 15 to open and place thespring 32 under tension, whereas theother valve 19 remains closed. - The advantages of the present invention are apparent from the aforegoing description. Firstly, compared with current methods it enables one pump and one electric motor to be eliminated, thus resulting in feed devices for the front windscreen washer and rear window washer which are simplified and of reduced weight. Secondly, compared with analogous reversible pumps of the known art, the pump of the present invention is of lower cost and simpler construction, in that the pump casino is substantially the same as the casing of current single-delivery pumps (ie having only one delivery duct), and does not use a special automatic valve, but instead uses common commercially available non-return valves which are of reliable operation, of very low cost and very light in weight. Furthermore, in the pump according to the invention, the pump compartement is kept completely free of any supplementary device and is occupied only by the impeller, thus preventing the creation of disturbances to the flow of wash fluid and/or creating local pressure drops. Finally, and most important, in the pump according to the present invention it is not necessary for the
delivery ducts - Finally, from the description it is apparent that modifications can be made to the described pump according to the present invention without leaving the scope of the invention itself. For example, the pump 1 can be volumetric or centrifugal, and the
impeller 7 could also be of the mobile blade, positive displacement or any other known type.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT5346683U | 1983-06-15 | ||
IT5346683U IT8353466V0 (en) | 1983-06-15 | 1983-06-15 | PUMP FOR SELECTIVE SUPPLY OF THE FRONT WASHER AND REAR WINDOW OF A VEHICLE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0128579A1 true EP0128579A1 (en) | 1984-12-19 |
EP0128579B1 EP0128579B1 (en) | 1988-05-04 |
Family
ID=11282996
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19840106693 Expired EP0128579B1 (en) | 1983-06-15 | 1984-06-12 | Pump for selectively feeding the front windscreen washer and rear window washer of a vehicle |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0128579B1 (en) |
DE (1) | DE3470915D1 (en) |
ES (1) | ES8503589A1 (en) |
IT (1) | IT8353466V0 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3714127A1 (en) * | 1986-04-30 | 1987-11-05 | Maruko Keihoki Kk | CONVEYOR PUMP WITH SELECTABLE DIRECTION |
DE3830542A1 (en) * | 1988-09-08 | 1990-03-15 | Licentia Gmbh | Centrifugal pump |
EP0694698A1 (en) * | 1994-05-25 | 1996-01-31 | WILO GmbH | Centrifugal pump |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB507487A (en) * | 1937-12-13 | 1939-06-13 | Rene Tondeur | Improvements in spring urged non-return valves and the manufacture thereof |
US2480108A (en) * | 1946-01-29 | 1949-08-30 | Martin J Barker | Adjustable by-pass check valve |
FR1142593A (en) * | 1956-02-08 | 1957-09-19 | Guinard Pompes | Improvement in centrifugal pumps with two directions of rotation |
FR1241403A (en) * | 1958-11-21 | 1960-09-16 | Thomson Houston Comp Francaise | Advanced reversible pump |
GB945956A (en) * | 1959-12-30 | 1964-01-08 | Gen Electric | Improvements in two-way valveless centrifugal pump |
GB1120505A (en) * | 1965-11-30 | 1968-07-17 | Alkon Products Corp | Improvements in check valve mechanism |
DE2334390A1 (en) * | 1973-07-06 | 1975-01-30 | Vdo Schindling | WINDOW WASHER SYSTEM FOR MOTOR VEHICLES |
DE2360601A1 (en) * | 1973-12-05 | 1975-06-12 | Westfaelische Metall Industrie | Two pressure control for windscreen washer - uses reversing impeller type pump to supply headlight nozzles also |
FR2278542A1 (en) * | 1974-07-18 | 1976-02-13 | Vdo Schindling | WINDOW WASHER FOR MOTOR VEHICLES |
-
1983
- 1983-06-15 IT IT5346683U patent/IT8353466V0/en unknown
-
1984
- 1984-06-12 DE DE8484106693T patent/DE3470915D1/en not_active Expired
- 1984-06-12 EP EP19840106693 patent/EP0128579B1/en not_active Expired
- 1984-06-14 ES ES533391A patent/ES8503589A1/en not_active Expired
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB507487A (en) * | 1937-12-13 | 1939-06-13 | Rene Tondeur | Improvements in spring urged non-return valves and the manufacture thereof |
US2480108A (en) * | 1946-01-29 | 1949-08-30 | Martin J Barker | Adjustable by-pass check valve |
FR1142593A (en) * | 1956-02-08 | 1957-09-19 | Guinard Pompes | Improvement in centrifugal pumps with two directions of rotation |
FR1241403A (en) * | 1958-11-21 | 1960-09-16 | Thomson Houston Comp Francaise | Advanced reversible pump |
GB945956A (en) * | 1959-12-30 | 1964-01-08 | Gen Electric | Improvements in two-way valveless centrifugal pump |
GB1120505A (en) * | 1965-11-30 | 1968-07-17 | Alkon Products Corp | Improvements in check valve mechanism |
DE2334390A1 (en) * | 1973-07-06 | 1975-01-30 | Vdo Schindling | WINDOW WASHER SYSTEM FOR MOTOR VEHICLES |
DE2360601A1 (en) * | 1973-12-05 | 1975-06-12 | Westfaelische Metall Industrie | Two pressure control for windscreen washer - uses reversing impeller type pump to supply headlight nozzles also |
FR2278542A1 (en) * | 1974-07-18 | 1976-02-13 | Vdo Schindling | WINDOW WASHER FOR MOTOR VEHICLES |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3714127A1 (en) * | 1986-04-30 | 1987-11-05 | Maruko Keihoki Kk | CONVEYOR PUMP WITH SELECTABLE DIRECTION |
DE3830542A1 (en) * | 1988-09-08 | 1990-03-15 | Licentia Gmbh | Centrifugal pump |
EP0694698A1 (en) * | 1994-05-25 | 1996-01-31 | WILO GmbH | Centrifugal pump |
Also Published As
Publication number | Publication date |
---|---|
EP0128579B1 (en) | 1988-05-04 |
ES533391A0 (en) | 1985-04-01 |
DE3470915D1 (en) | 1988-06-09 |
IT8353466V0 (en) | 1983-06-15 |
ES8503589A1 (en) | 1985-04-01 |
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