CA1227635A - Method and apparatus for transporting liquid metal - Google Patents
Method and apparatus for transporting liquid metalInfo
- Publication number
- CA1227635A CA1227635A CA000435353A CA435353A CA1227635A CA 1227635 A CA1227635 A CA 1227635A CA 000435353 A CA000435353 A CA 000435353A CA 435353 A CA435353 A CA 435353A CA 1227635 A CA1227635 A CA 1227635A
- Authority
- CA
- Canada
- Prior art keywords
- pump
- canal
- immersion
- liquid metal
- electromagnetic
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K44/00—Machines in which the dynamo-electric interaction between a plasma or flow of conductive liquid or of fluid-borne conductive or magnetic particles and a coil system or magnetic field converts energy of mass flow into electrical energy or vice versa
- H02K44/02—Electrodynamic pumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D39/00—Equipment for supplying molten metal in rations
- B22D39/003—Equipment for supplying molten metal in rations using electromagnetic field
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Extraction Or Liquid Replacement (AREA)
Abstract
ABSTRACT-OF THY DISCLOSURE
.
System for transporting molten metal from a vessel containing molten metal by immersing a self-priming electromagnetic immersion pump in the molten vessel, and connecting the immersion pump to an electromagnetic canal pump incapable of self-priming and disposed outside the molten metal in the tank via a transport canal.
.
System for transporting molten metal from a vessel containing molten metal by immersing a self-priming electromagnetic immersion pump in the molten vessel, and connecting the immersion pump to an electromagnetic canal pump incapable of self-priming and disposed outside the molten metal in the tank via a transport canal.
Description
~2~7~ 20365-2319 The present invention relates to method and apparatus for transporting liquid metal, and more particularly refers to a new and improved system employing electromagnetic pumps for removing and transporting molten metal from vessels, especially liquid aluminum in foundries.
Description of the Prior Art Electromagnetic pumps are known. They utilize the motor principle that a conductor in a magnetic field, carrying a current which flows at an angle to the direction of the field has a force exerted on it. In all electromagnetic pumps the fluid is the conductor.
German U.S. 29 24 116 and German Published Non-Prosecuted Application DEMOS 31 41 774 and a paper by R. Hans at the German Foundry Convention in Koblenz on June 15 and 16, 1982, entitled "New Electromagnetic Pumps for Aluminum Casting", discloses different types of pumps for transporting liquid metal. They are described on the one hand, as a canal pump and on the other hand, as an immersion pump for transporting aluminum. An example of the canal pump described in German U.S. 29 24 116 is a tube having a prismatic cross section, a plurality of comb-like slotted magnet cores grouped about the periphery of the tube and extending parallel to the flow direction of the liquid metal, electromagnetic coils respectively connected to one of the phases of a polyphase alternating current and mounted respectively on teeth of the plurality of comb-like magnet cores, nix of the coils of which n equals an optional whole number and x er~luals the number of a-c phases being mounted on each of the magnet cores, the magnet cores being disposed in planes extending at an angle other than 90 to the VIA I P 6731 CA ' 2 my -1-surface of the tube. Similarly, an example of an induction immersion pump described in German Application No. DE 31 41 774 comprises a temperature-resistant housing extended above and below a given liquid level, a channel disposed in said housing at least partially below said given liquid level, said channel having a substantially rectangular cross section with wide and narrow outer surfaces, a comb-shaped coil core being disposed in said housing and having teeth pointing toward said channel, copper induction coils disposed on said coil core at said wide outer surface of said channel, and at least one feed line and at listen discharge line for inert gas disposed in lo said housing above said given liquid level.
While the canal pump can handle larger outputs, it has the disadvantage that it is not self-priming and therefore must first be filled With liquid metal at the start of the casting process. Although the immersion pump is self-priming, it cannot provide as high an output as a canal pump because of temperature problems.
Summary of the Invention An object of the present invention is to provide a system for transporting liquid metal which combines the advantageous properties of both pumps and therefore results in a self-priming pumping device with high output.
With the foregoing and other objects in view, there is provided in accordance with the invention a system for transporting molten metal comprising a vessel, a body of molten metal in the vessel, an electromagnetic immersion pump capable of self-priming with an inlet side and a discharge side immersed in the body of liquid metal, a transport canal having one end connected to the discharge side of the electromagnetic immersion pump and the other end of the transport canal extending outside the body of liquid metal, an
Description of the Prior Art Electromagnetic pumps are known. They utilize the motor principle that a conductor in a magnetic field, carrying a current which flows at an angle to the direction of the field has a force exerted on it. In all electromagnetic pumps the fluid is the conductor.
German U.S. 29 24 116 and German Published Non-Prosecuted Application DEMOS 31 41 774 and a paper by R. Hans at the German Foundry Convention in Koblenz on June 15 and 16, 1982, entitled "New Electromagnetic Pumps for Aluminum Casting", discloses different types of pumps for transporting liquid metal. They are described on the one hand, as a canal pump and on the other hand, as an immersion pump for transporting aluminum. An example of the canal pump described in German U.S. 29 24 116 is a tube having a prismatic cross section, a plurality of comb-like slotted magnet cores grouped about the periphery of the tube and extending parallel to the flow direction of the liquid metal, electromagnetic coils respectively connected to one of the phases of a polyphase alternating current and mounted respectively on teeth of the plurality of comb-like magnet cores, nix of the coils of which n equals an optional whole number and x er~luals the number of a-c phases being mounted on each of the magnet cores, the magnet cores being disposed in planes extending at an angle other than 90 to the VIA I P 6731 CA ' 2 my -1-surface of the tube. Similarly, an example of an induction immersion pump described in German Application No. DE 31 41 774 comprises a temperature-resistant housing extended above and below a given liquid level, a channel disposed in said housing at least partially below said given liquid level, said channel having a substantially rectangular cross section with wide and narrow outer surfaces, a comb-shaped coil core being disposed in said housing and having teeth pointing toward said channel, copper induction coils disposed on said coil core at said wide outer surface of said channel, and at least one feed line and at listen discharge line for inert gas disposed in lo said housing above said given liquid level.
While the canal pump can handle larger outputs, it has the disadvantage that it is not self-priming and therefore must first be filled With liquid metal at the start of the casting process. Although the immersion pump is self-priming, it cannot provide as high an output as a canal pump because of temperature problems.
Summary of the Invention An object of the present invention is to provide a system for transporting liquid metal which combines the advantageous properties of both pumps and therefore results in a self-priming pumping device with high output.
With the foregoing and other objects in view, there is provided in accordance with the invention a system for transporting molten metal comprising a vessel, a body of molten metal in the vessel, an electromagnetic immersion pump capable of self-priming with an inlet side and a discharge side immersed in the body of liquid metal, a transport canal having one end connected to the discharge side of the electromagnetic immersion pump and the other end of the transport canal extending outside the body of liquid metal, an
- 2 -~L22763~
electromagnetic canal pump incapable of self-priming with an inlet side and a discharge side disposed outside the body of liquid metal, said other end of the transport canal connected to the inlet side of the electromagnetic canal pump, and a discharge tube connected to the discharge side of the electron magnetic canal for discharge of the liquid metal.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a method and apparatus for transporting liquid metal, it is nevertheless not intended to be limited to the details shown, since various modifications may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
Brief Description of the Drawing The invention, however, together with additional objects and advantages thereof will be best understood from the following description when read in connection with the accompanying drawing which diagrammatically illustrates a system for transporting molten metal in which a vessel containing molten metal has immersed therein a self-priming electromagnetic immersion pump from which extends a transport canal which latter is connected to an electromagnetic canal pump incapable of self-priming.
Detailed Description of the Invention In accordance with the invention for transporting liquid metal, an electromagnetic immersion pump and an electromagnetic canal pump, as are known per so, are arranged in tandem. This has, first, the advantage that the canal pump can be flooded by the immersion pump, eliminating the need for expensive priming devices of the mechanical type, which have heretofore been ~22763S
necessary for canal pumps. In this manner, some problems which heretofore had to be considered due to temperature shocks in priming the canal pumps can now be avoided.
It would at first appear that the pumping output of two series-connected pumps would be determined more by the output of the weaker pump, but surprisingly this is not the case with electromagnetic pumps. Since there are no built-in components in the transport canal and the pumping is accomplished only by magnetic traveling fields, an immersion pump can very well be made with a low output but with a relatively large canal cross section. The reason for this is that the output of the immersion pump is limited not so much by the possible canal cross sections but rather by the maximum possible heat of dissipation in the coils and in the core. An immersion pump can therefore be constructed which has a canal cross section which corresponds approximately to that of a canal pump. yule such an enlargement of the canal of the immersion pump which exceeds the optimum size reduces the output of the former and increases the dissipation loss in the coils and in the core, the pump can nevertheless pump liquid metal without overheating for a short time. This short time is adequate however, to flood the canal pump. Upon flooding the canal pump, the immersion pump can then be switched off while the canal pump thereupon takes over the entire output. The pump canal of the immersion pump then serves only as a pump line.
In an embodiment, the output of the canal pump is considerably large, 10-50% or more, than that of the immersion pump. This combination of the use of the two pumps, which are of course more expensive than a simple immersion pump, has distinct advantages. Actually only the output of the canal pump now determine the properties during continuous operation, while the immersion pump is used only for flooding the canal pump incapable of self-t - 4 -~.227635 priming.
In a further embodiment of the invention the immersion pump is designed only for short-time operation and in particular, to no longer use any cooling and expensive, efficiency-increasing devices which are normally associated with the immersion pump. Many of the problems which must be taken into consideration in connection with immersion pumps, occur only as a result of continuous use of the immersion pumps. For example, in extended operation of an immersion pump, the coils and the core become considerably hotter than the pumped liquid metal, causing problems with the Curie point of the magnetic materials to arise and oxidation problems with copper coils.
In short-time operation of immersion pumps such difficulties are negligible, consequently various measures for intermittently operated immersion pumps can be dispensed with, such as flushing with inert or cooling gas and the use of expensive materials with a particularly high Curie point.
In a method for transporting liquid metal, the self-priming immersion pump is operated only a* the start of the pumping, until the canal pump, not self-priming, is flooded, and the pumping is then continued exclusively with the canal pump. This method avoids the heretofore customary mechanical flooding of tile canal pump from a pouring vessel with the problems of the temperature shock and other disadvantages. The use of this combination eliminates the need for the supply vessel for liquid metal to be accessible for ladling devices.
In a further embodiment the output is controlled in operation exclusively by the canal pump in known manner. After the canal pump is flooded, the immersion pump gem therefore be switched off entirely, whereby the temperature of the entire system of the immersion pump corresponds ~227635 approximately to the malting temperature of the metal. The control of the output, for instance, for precisely apportioning the pumped liquid metal, is accomplished only by the canal pump, so that the proposed system is not any more difficult to 1l2ndle titan the known individual systems.
The proposed arrangement is particularly well suited for foundries in Lucia large outputs are required. In addition, the use of immersion pumps in combination with a canal pump may also be employed for liquid metals which have a haggler melting temperature than aluminum since the problems of the immersion pump occur mainly in long-time power operation. An immersion pump itch is suitable in continuous operation for aluminum can also be used for a short time for metals with very much higher melting points.
An embodiment example of the invention is shown schematically in the drawing:
Vessel 1 contains a liquid metal melt 2, in which an electron magnetic immersion pump 3 is immersed. As indicated by arrows, the liquid metal is conducted through the immersion pump and via a transport canal 4 to a canal pump 5, from which it is then conducted to a discharge tube 6. The start of the pumping can be accomplished by the immersion pump I. From the time at which the canal pump 5 is flooded, the pumping is done by the canal pup alone. Flooding the canal pump from the outside, which has been necessary heretofore is now unnecessary.
. .
electromagnetic canal pump incapable of self-priming with an inlet side and a discharge side disposed outside the body of liquid metal, said other end of the transport canal connected to the inlet side of the electromagnetic canal pump, and a discharge tube connected to the discharge side of the electron magnetic canal for discharge of the liquid metal.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a method and apparatus for transporting liquid metal, it is nevertheless not intended to be limited to the details shown, since various modifications may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
Brief Description of the Drawing The invention, however, together with additional objects and advantages thereof will be best understood from the following description when read in connection with the accompanying drawing which diagrammatically illustrates a system for transporting molten metal in which a vessel containing molten metal has immersed therein a self-priming electromagnetic immersion pump from which extends a transport canal which latter is connected to an electromagnetic canal pump incapable of self-priming.
Detailed Description of the Invention In accordance with the invention for transporting liquid metal, an electromagnetic immersion pump and an electromagnetic canal pump, as are known per so, are arranged in tandem. This has, first, the advantage that the canal pump can be flooded by the immersion pump, eliminating the need for expensive priming devices of the mechanical type, which have heretofore been ~22763S
necessary for canal pumps. In this manner, some problems which heretofore had to be considered due to temperature shocks in priming the canal pumps can now be avoided.
It would at first appear that the pumping output of two series-connected pumps would be determined more by the output of the weaker pump, but surprisingly this is not the case with electromagnetic pumps. Since there are no built-in components in the transport canal and the pumping is accomplished only by magnetic traveling fields, an immersion pump can very well be made with a low output but with a relatively large canal cross section. The reason for this is that the output of the immersion pump is limited not so much by the possible canal cross sections but rather by the maximum possible heat of dissipation in the coils and in the core. An immersion pump can therefore be constructed which has a canal cross section which corresponds approximately to that of a canal pump. yule such an enlargement of the canal of the immersion pump which exceeds the optimum size reduces the output of the former and increases the dissipation loss in the coils and in the core, the pump can nevertheless pump liquid metal without overheating for a short time. This short time is adequate however, to flood the canal pump. Upon flooding the canal pump, the immersion pump can then be switched off while the canal pump thereupon takes over the entire output. The pump canal of the immersion pump then serves only as a pump line.
In an embodiment, the output of the canal pump is considerably large, 10-50% or more, than that of the immersion pump. This combination of the use of the two pumps, which are of course more expensive than a simple immersion pump, has distinct advantages. Actually only the output of the canal pump now determine the properties during continuous operation, while the immersion pump is used only for flooding the canal pump incapable of self-t - 4 -~.227635 priming.
In a further embodiment of the invention the immersion pump is designed only for short-time operation and in particular, to no longer use any cooling and expensive, efficiency-increasing devices which are normally associated with the immersion pump. Many of the problems which must be taken into consideration in connection with immersion pumps, occur only as a result of continuous use of the immersion pumps. For example, in extended operation of an immersion pump, the coils and the core become considerably hotter than the pumped liquid metal, causing problems with the Curie point of the magnetic materials to arise and oxidation problems with copper coils.
In short-time operation of immersion pumps such difficulties are negligible, consequently various measures for intermittently operated immersion pumps can be dispensed with, such as flushing with inert or cooling gas and the use of expensive materials with a particularly high Curie point.
In a method for transporting liquid metal, the self-priming immersion pump is operated only a* the start of the pumping, until the canal pump, not self-priming, is flooded, and the pumping is then continued exclusively with the canal pump. This method avoids the heretofore customary mechanical flooding of tile canal pump from a pouring vessel with the problems of the temperature shock and other disadvantages. The use of this combination eliminates the need for the supply vessel for liquid metal to be accessible for ladling devices.
In a further embodiment the output is controlled in operation exclusively by the canal pump in known manner. After the canal pump is flooded, the immersion pump gem therefore be switched off entirely, whereby the temperature of the entire system of the immersion pump corresponds ~227635 approximately to the malting temperature of the metal. The control of the output, for instance, for precisely apportioning the pumped liquid metal, is accomplished only by the canal pump, so that the proposed system is not any more difficult to 1l2ndle titan the known individual systems.
The proposed arrangement is particularly well suited for foundries in Lucia large outputs are required. In addition, the use of immersion pumps in combination with a canal pump may also be employed for liquid metals which have a haggler melting temperature than aluminum since the problems of the immersion pump occur mainly in long-time power operation. An immersion pump itch is suitable in continuous operation for aluminum can also be used for a short time for metals with very much higher melting points.
An embodiment example of the invention is shown schematically in the drawing:
Vessel 1 contains a liquid metal melt 2, in which an electron magnetic immersion pump 3 is immersed. As indicated by arrows, the liquid metal is conducted through the immersion pump and via a transport canal 4 to a canal pump 5, from which it is then conducted to a discharge tube 6. The start of the pumping can be accomplished by the immersion pump I. From the time at which the canal pump 5 is flooded, the pumping is done by the canal pup alone. Flooding the canal pump from the outside, which has been necessary heretofore is now unnecessary.
. .
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS
1. System for transporting molten metal comprising a vessel, a body of molten metal in the vessel, an electromagnetic immersion pump capable of self-priming with an inlet side and a discharge side immersed in the body of liquid metal, a transport canal having one end connected to the discharge side of the electromagnetic immersion pump and the other end of the transport canal extending outside the body of the liquid metal, an electromagnetic canal pump incapable of self-priming with an inlet side and a discharge side disposed outside the body of liquid metal, said other end of the transport canal connected to the inlet side of the electromagnetic canal pump, and a discharge tube connected to the discharge side of the electromagnetic canal or discharge of the liquid metal.
2. System according to claim 1, wherein said other end of the transport canal extends upwardly above the top of the vessel.
3. System according to claim 1, wherein the output of the canal pump is considerably larger than that of the immersion pump.
4. System according to claim 1, wherein the immersion pump is designed only for short-time operation, and has no cooling and efficiency-increasing devices.
5. System according to claim 2, wherein the immersion pump is designed only for short-time operation, and has no cooling and efficiency-increasing devices.
6. System for transporting molten metal according to claim 1, wherein the immersion pump which is self-priming is operated only at the start of the pumping until the canal pump which is not self-priming is flooded, and further pumping is accomplished exclusively by the canal pump.
7. System according to claim 6, wherein measured amounts of liquid metal output is controlled exclusively by the canal pump.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19823231889 DE3231889C1 (en) | 1982-08-26 | 1982-08-26 | Process and apparatus for conveying liquid metal |
| DEP3231889.8 | 1982-08-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1227635A true CA1227635A (en) | 1987-10-06 |
Family
ID=6171835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000435353A Expired CA1227635A (en) | 1982-08-26 | 1983-08-25 | Method and apparatus for transporting liquid metal |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5956968A (en) |
| CA (1) | CA1227635A (en) |
| DE (1) | DE3231889C1 (en) |
| ES (1) | ES8404889A1 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5551414A (en) * | 1978-10-12 | 1980-04-15 | Taiho Kogyo Co Ltd | Filter medium |
-
1982
- 1982-08-26 DE DE19823231889 patent/DE3231889C1/en not_active Expired
-
1983
- 1983-08-24 JP JP15473383A patent/JPS5956968A/en active Pending
- 1983-08-25 ES ES525146A patent/ES8404889A1/en not_active Expired
- 1983-08-25 CA CA000435353A patent/CA1227635A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3231889C1 (en) | 1984-03-08 |
| ES525146A0 (en) | 1984-05-16 |
| ES8404889A1 (en) | 1984-05-16 |
| JPS5956968A (en) | 1984-04-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |