A pressure pump for conveying high-temperature melts and its usage method

Abstract

This invention relates to the field of industrial production technology, specifically to a pressure pump for conveying high-temperature melt and its usage method. The pressure pump for conveying high-temperature melt includes a suction pipe, a pump body, a discharge pipe, a drive mechanism, a small valve ball, and a large valve ball. The drive mechanism is located outside the high-temperature melt and is configured to reciprocate in suction and discharge into the storage cavity. The small valve ball is configured to prevent the high-temperature melt sucked into the discharge pipe from flowing back when the drive mechanism sucks pressure into the storage cavity; the large valve ball is configured to prevent the high-temperature melt sucked into the pump body from flowing back when the drive mechanism discharges pressure into the storage cavity. The entire suction and pressure device for conveying high-temperature melt consists of only six parts, is simple to manufacture, low in cost, and easy to install and operate, and can greatly reduce production costs and improve production efficiency.

Description

Technical Field

[0001] This invention relates to the field of industrial production technology, specifically to a pressure pump for conveying high-temperature melts and its usage method. Background Technology

[0002] In the production process of electrolytic magnesium chloride on a production line, it is necessary to periodically return high-temperature molten magnesium chloride salt from the tail tank to the head tank. The original method was to use a crane to lift a vacuum ladle of magnesium chloride to the tail tank for extraction. After the ladle was full, the crane would lift the vacuum ladle of magnesium chloride back to the head tank, where the high-temperature molten magnesium chloride salt would be added for continued electrolysis, thus forming a cycle. The entire process was lengthy, cumbersome, and inefficient, severely impacting production.

[0003] Utility model patent CN206464532U discloses a high-temperature molten metal conveying system for die-casting products. It utilizes a conveying pump to power the conveying of high-temperature magnesium alloy molten metal, which is placed inside the melting furnace during operation. During the conveying of the high-temperature molten metal, due to its high temperature (>600℃), conventional pumps, containing organic seal materials, cannot withstand such high temperatures, easily leading to damage and a short service life, making them unsuitable for this application. Currently, there is no suitable pumping device capable of continuous conveying. Therefore, the existing technology still needs improvement. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention proposes a pressure pump and its usage method for high-temperature melt conveying, so as to solve the problems of long process, cumbersome operation and short service life of existing high-temperature melt conveying systems.

[0005] A pressure pump for conveying high-temperature melt includes a suction pipe, a pump body, a discharge pipe, a drive mechanism, a small valve ball, and a large valve ball. The suction pipe is inserted into the high-temperature melt in a first groove. The pump body is sealed to the suction pipe to form a storage cavity, the top of which is higher than the horizontal plane of the high-temperature melt. The discharge pipe is configured to connect the storage cavity to a second groove. The drive mechanism is located outside the high-temperature melt and is configured to reciprocate to suction and discharge pressure into the storage cavity. The small valve ball is configured to prevent the high-temperature melt sucked into the discharge pipe from flowing back when the drive mechanism suctions pressure into the storage cavity. The large valve ball is configured to prevent the high-temperature melt sucked into the pump body from flowing back when the drive mechanism discharges pressure into the storage cavity.

[0006] Furthermore, the drive mechanism includes a suction tube and a piston reciprocating pump; one end of the suction tube is connected to the storage chamber, and the other end of the suction tube is connected to the pump cylinder of the piston reciprocating pump.

[0007] Furthermore, a buffer device is connected between the suction pipe and the piston reciprocating pump via an extension pipe.

[0008] Furthermore, the discharge pipe includes a first pipe section and a second pipe section. The first pipe section is vertically disposed in the storage cavity and is located below the horizontal plane of the high-temperature melt. The second pipe section is horizontally installed in the pump body. The two ends of the second pipe section are respectively located in the first groove and the second groove, and the end of the second pipe section located in the first groove is connected to the upper end of the first pipe section.

[0009] Furthermore, a tapered opening is provided at the lower end of the first pipe section, and a small valve ball is movably disposed within the first pipe section. The density of the small valve ball is greater than the density of the high-temperature melt, and the diameter of the small valve ball is greater than the inner diameter of the tapered opening and smaller than the inner diameter of the first pipe section.

[0010] Furthermore, the extrusion tube can also be located on the outside of the high-temperature melt, with the portion of the extrusion tube located on the outside of the high-temperature melt wrapped with refractory insulation material.

[0011] Furthermore, the outer periphery of the extrusion tube is also covered with heating equipment.

[0012] Furthermore, the large valve ball is movably positioned within the storage cavity. The diameter of the large valve ball is larger than the inner diameter of the suction tube and the diameter of the first section of the discharge tube, and the density of the large valve ball is greater than the density of the high-temperature melt.

[0013] Furthermore, the suction pipe, pump body, discharge pipe, suction pipe, small valve ball, and large valve ball are all made of high-temperature and corrosion-resistant materials.

[0014] A method of using the aforementioned pressure pump for conveying high-temperature melt, when it is necessary to transfer high-temperature melt from a first tank to a second tank, includes the following steps:

[0015] S1, activate the drive mechanism to generate suction, which is transmitted to the storage chamber. The small valve ball falls and blocks the extrusion tube, preventing the melt in the extrusion tube from flowing back. The large valve ball rises and opens the suction tube, allowing the high-temperature melt to enter the storage chamber.

[0016] S2, the drive mechanism generates pressure, the pressure is transmitted to the storage chamber, the large valve ball descends, blocking the suction pipe and preventing the melt in the pump body from flowing back, the small valve ball rises, opening the discharge pipe and allowing the high-temperature melt to enter the discharge pipe;

[0017] S3, repeating steps S1 and S2, to transport the high-temperature melt into the second tank.

[0018] The beneficial effects of this invention are as follows: the entire high-temperature melt conveying suction device consists of only six parts, which is simple to process and manufacture, low in cost, and easy to install and operate. It can greatly reduce production costs and improve production efficiency. Moreover, by setting the drive mechanism on the outside of the high-temperature melt, the precision components in the drive mechanism are prevented from being damaged by high temperature. Compared with the prior art, which puts the drive mechanism directly into the high-temperature melt, it is safer and has a longer service life. Attached Figure Description

[0019] Figure 1 This diagram illustrates the structure of a pressure pump for conveying high-temperature melts according to an embodiment of the present invention.

[0020] Figure 2 The diagram shows a usage state of a pressure pump for conveying high-temperature melts according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached drawings: 1. Suction pipe; 2. Large valve ball; 3. Pump body; 4. Small valve ball; 5. Discharge pipe; 6. Suction pipe; 7. Piston reciprocating pump; 8. Tail trough; 9. Head trough; 10. Electrolytic cell in production line; 11. Cooling buffer equipment; 12. Magnesium chloride and magnesium mixed melt flow channel. Detailed Implementation

[0022] It should be understood that the embodiments of the invention shown in the exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in this invention, those skilled in the art will readily recognize that various modifications are possible without substantially departing from the teachings of the invention. Accordingly, all such modifications should be included within the scope of the invention. Other substitutions, modifications, variations, and deletions can be made to the design, operating conditions, and parameters of the following exemplary embodiments without departing from the spirit of the invention.

[0023] like Figure 1 As shown, this embodiment of the invention provides a pressure pump for conveying high-temperature melt. The pressure pump for conveying high-temperature melt includes a suction pipe 1, a pump body 3, a discharge pipe 5, a drive mechanism, a small valve ball 4, and a large valve ball 2. The suction tube 1 is inserted into the high-temperature melt in the first tank. The suction tube 1 includes a tapered tube section that is larger at the top and smaller at the bottom, and a vertical tube section that connects to the lower end of the tapered tube section. The pump body 3 is located above the suction tube 1, and the pump body 3 is sealed to the upper end of the suction tube 1 to form a storage cavity isolated from the outside. Specifically, the pump body 3 can be connected to the upper end of the suction tube 1 by welding. The main function of the suction tube 1 is to suck the high-temperature melt into the storage cavity, which is used to temporarily store the high-temperature melt. The top of the storage cavity is higher than the horizontal plane of the high-temperature melt. The discharge tube 5 is configured to connect the storage cavity to the second tank. The drive mechanism is located outside the high-temperature melt to prevent the precision components in the drive mechanism from being damaged by the high temperature. The drive mechanism is configured to reciprocate to suck and discharge pressure into the storage cavity. The small valve ball 4 is configured to prevent the high-temperature melt sucked into the discharge tube 5 from flowing back when the drive mechanism sucks pressure into the storage cavity. The large valve ball 2 is configured to prevent the high-temperature melt sucked into the pump body 3 from flowing back when the drive mechanism discharges pressure into the storage cavity.

[0024] By configuring the drive mechanism, small valve ball 4, and large valve ball 2, when the drive mechanism draws pressure into the storage cavity, the suction force is transmitted to the pump body 3. At this time, the small valve ball 4 falls under the action of suction, blocking the discharge pipe 5 and preventing the high-temperature melt in the discharge pipe 5 from flowing back. Meanwhile, the large valve ball 2 rises under the action of suction, opening the suction pipe 1 and allowing the high-temperature melt to enter the storage cavity. When the drive mechanism discharges pressure into the storage cavity, the pressure is transmitted to the pump body 3. At this time, the large valve ball 2 falls under the push of air pressure, blocking the suction pipe 1 and preventing the high-temperature melt in the pump body 3 from flowing back. Meanwhile, the small valve ball 4 rises under the push of air pressure, opening the inlet of the discharge pipe 5 and allowing the high-temperature melt to enter the discharge pipe 5 from the storage cavity. This process is repeated, and the high-temperature melt is continuously transported to the second tank. The top of the storage cavity is set to be higher than the level of the high-temperature melt, which serves to buffer the suction process and prevent the drawn-in high-temperature melt from damaging the drive mechanism.

[0025] The entire high-temperature melt conveying suction and pressure device consists of only six parts, making it simple to manufacture, low in cost, and easy to install and operate, which can greatly reduce production costs and improve production efficiency. Furthermore, compared with existing technologies that place the drive mechanism directly into the high-temperature melt, it offers higher safety and a longer service life.

[0026] In some embodiments, the drive mechanism includes a suction pipe 6 and a piston reciprocating pump 7; one end of the suction pipe 6 communicates with the storage cavity, and the other end of the suction pipe 6 communicates with the pump cylinder of the piston reciprocating pump 7. Specifically, as Figure 1 As shown, one end of the suction pipe 6 is connected to the upper end of the storage cavity. The suction pressure generated by the reciprocating movement of the piston of the piston reciprocating pump 7 is delivered to the storage cavity through the suction pipe 6, thereby generating the action of sucking up the high-temperature melt and extruding the high-temperature melt.

[0027] In some embodiments, the other end of the suction pipe 6 can be bent arbitrarily, and the suction pipe 6 and the piston reciprocating pump 7 are also connected to a buffer device, such as a cooling buffer device 11, through an extension pipe to process the gas discharged and sucked.

[0028] In some embodiments, the extrusion tube 5 includes a first tube section and a second tube section. The first tube section is vertically disposed within the storage cavity and is located below the horizontal plane of the high-temperature melt. The second tube section is horizontally installed on the pump body 3, with its two ends respectively located in the first and second grooves. The end of the second tube section located in the first groove is connected to the upper end of the first tube section, so that the extrusion tube 5 is completely immersed in the high-temperature melt, preventing the high-temperature melt from solidifying during the conveying process. The diameter and height of the extrusion tube 5, as well as its installation position, can be adjusted according to production needs, making it suitable for different working scenarios.

[0029] In some embodiments, a tapered opening is provided at the lower end of the first pipe section, and a small valve ball 4 is movably disposed within the first pipe section. The diameter of the small valve ball 4 can be adjusted according to the diameter of the first pipe section of the extrusion pipe 5. The diameter of the small valve ball 4 is larger than the inner diameter of the tapered opening and smaller than the inner diameter of the first pipe section. Furthermore, the density of the small valve ball 4 is much greater than the density of the high-temperature melt, so as to ensure that the small valve ball 4 can fall back by its own weight, block the tapered opening at the lower end of the first pipe section, and not be carried away by the flowing high-temperature melt.

[0030] In some embodiments, the second section of the extrusion pipe 5 may also be located outside the high-temperature melt, but the outside of the second section is preferably wrapped with refractory insulation material, or even surrounded by heating equipment, to prevent the high-temperature melt from solidifying inside the extrusion pipe 5. The diameter and length of the extrusion pipe 5 can be adjusted according to the required flow rate and target position for production.

[0031] In some embodiments, the large valve ball 2 is movably disposed in the storage cavity. The diameter of the large valve ball 2 can be adjusted according to the diameter of the vertical section of the suction tube 1. The diameter of the large valve ball 2 is slightly larger than the inner diameter of the vertical section of the suction tube 1 and larger than the inner diameter of the conical opening at the lower end of the first section of the extrusion tube 5. The density of the large valve ball 2 is greater than the density of the high-temperature melt, so as to ensure that it can fall back by its own weight and block the opening of the suction tube 1.

[0032] In some embodiments, the suction pipe 1, pump body 3, discharge pipe 5, suction pipe 6, small valve ball 4, and large valve ball 2 are all made of high-temperature and corrosion-resistant materials, such as quartz glass and ceramics, to adapt to high-temperature melts.

[0033] The working principle and usage method of the pressure pump for conveying high-temperature melt provided in the above embodiments are as follows:

[0034] When it is necessary to transfer the high-temperature melt from the first tank to the second tank, the piston reciprocating pump 7 is activated. When the piston of the piston reciprocating pump 7 moves downward, it generates suction. The suction is transmitted to the storage chamber through the suction pipe 6. At this time, the small valve ball 4 falls under the action of suction, blocking the conical opening at the lower end of the first section of the discharge pipe 5, preventing the melt in the discharge pipe 5 from flowing back. Meanwhile, the large valve ball 2 rises under the action of suction, opening the opening of the suction pipe 1, allowing the high-temperature melt to enter the storage chamber. When the piston of the piston reciprocating pump 7 moves upward, it generates pressure. The pressure is transmitted to the storage chamber through the suction pipe 6. At this time, the large valve ball 2 falls under the action of pressure, blocking the suction pipe 1, preventing the melt in the pump body 3 from flowing back. Meanwhile, the small valve ball 4 rises under the action of pressure, opening the conical opening at the lower end of the first section of the discharge pipe 5, allowing the high-temperature melt to enter the discharge pipe 5. This process is repeated, and the high-temperature melt is continuously transported to the second tank.

[0035] like Figure 2As shown, taking magnesium chloride electrolysis as an example, the usage of the pressure pump for high-temperature melt transportation is further explained:

[0036] The first tank is the tail tank 8, the second tank is the head tank 9, and several production line electrolytic cells 10 are arranged between the head tank 9 and the tail tank 8. Magnesium chloride and magnesium mixed melt flow channels 12 are arranged between two adjacent production line electrolytic cells 10, between the production line electrolytic cell 10 and the head tank 9, and between the production line electrolytic cell 10 and the tail tank 8. During the electrolysis of magnesium chloride in a production line, molten magnesium chloride is first injected into the head tank 9 for pre-electrolysis and impurity removal. New magnesium chloride is continuously added during this process until the high-temperature magnesium and magnesium chloride melt overflows the magnesium chloride and magnesium mixed melt flow channel 12 and enters the first-stage production line electrolysis cell 10. Electrolysis begins when the high-temperature magnesium and magnesium chloride melt overflows the electrodes to a certain height. When the high-temperature magnesium chloride melt in the electrolysis cell overflows the magnesium chloride and magnesium mixed melt flow channel 12, the high-temperature magnesium and magnesium chloride melt enters the next-stage production line electrolysis cell 10. This process is repeated until the high-temperature melt enters the tail tank 8. At this point, in the tail tank 8, due to the different densities of magnesium and magnesium chloride melts, the magnesium liquid floats on the surface of the melt, while the magnesium chloride is in the lower layer. The traditional method is to periodically use a liquid magnesium vacuum lifter to remove the liquid magnesium from the surface and send it for reuse. The unelectrolyzed magnesium chloride is periodically removed from the lower layer using a magnesium chloride vacuum lifter and returned to the head tank 9 for a new round of electrolysis. This method requires both overhead cranes for hoisting and expensive pallet trucks for transport, making it cumbersome, inefficient, and costly.

[0037] The pressure pump for high-temperature melt transportation of the present invention directly immerses the suction pipe 1 of the suction pump and the pump body 3 of the traditional submersible pump into the high-temperature melt in the tail trough 8. The high-temperature melt is continuously transported to the user by the suction and pressure of the piston reciprocating pump 7. The embodiment of the present invention only illustrates the transportation of high-temperature magnesium chloride melt from the tail trough 8 to the head trough 9. In order to ensure that the melt does not solidify due to temperature drop during transportation, the embodiment of the present invention utilizes the production line electrolytic cell 10 and the magnesium chloride and magnesium mixed melt flow channel 12 as the transportation channel. The pressure pipe 5 is arranged along the length of the magnesium chloride and magnesium mixed melt flow channel 12 until it extends to the tail trough 8. During the entire production process, the pressure pipe 5 is completely immersed in the high-temperature melt, so that the temperature inside and outside the pressure pipe 5 is consistent with the high-temperature melt, thereby effectively preventing pipe blockage caused by solidification during the transportation of high-temperature melt.

[0038] When the high-temperature melt level in the tail trough 8 rises to the specified height, the piston reciprocating pump 7 is opened, and the high-temperature melt suction device continuously transports the high-temperature melt back to the tail trough 9. When the high-temperature melt level in the tail trough 8 drops to the specified height due to continuous reduction, the piston reciprocating pump 7 is stopped, and the transport stops.

[0039] By periodically repeating the above process throughout the production process, the continuous delivery of high-temperature melt can be ensured.

[0040] The pressure pump for conveying high-temperature melts of the present invention is applied to the return of magnesium chloride in the electrolytic production process of magnesium chloride production line. It is simple to operate, easy to maintain, and can further reduce costs, and has good application prospects.

[0041] The pressure pump of this invention for conveying high-temperature melts can also be applied to the conveying of other high-temperature melts, such as high-temperature liquid magnesium produced by the electrolysis of magnesium chloride production lines, and the electrolytic production of rare earth metals using molten salts. In this case, due to the long distance of the equipment, it cannot be guaranteed that the discharge pipe 5 will be fully immersed in the high-temperature melt. Without additional measures, there is a high probability of pipe blockage, leading to conveying failure. To ensure smooth conveying, the portion of the discharge pipe 5 exposed to the high-temperature melt should be entirely wrapped with a refractory insulation layer. For the extremely distant portion where the temperature drops significantly, a heating jacket may even be necessary. While this method can still achieve conveying, it greatly increases the conveying cost. If it is to be used, its conveying cost and efficiency should be compared with the method of using liquid magnesium in a ladle before determining the optimal method.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications or equivalent substitutions made to the present invention without departing from the spirit and scope thereof should be covered within the protection scope of the claims of the present invention.

Claims

1. A positive displacement pump for high temperature melt delivery, characterized by, The system includes a suction tube, a pump body, a discharge tube, a drive mechanism, a small valve ball, and a large valve ball. The suction tube is inserted into the high-temperature melt in the first slot. The pump body is sealed to the suction tube to form a storage cavity, the top of which is higher than the horizontal plane of the high-temperature melt. The discharge tube connects the storage cavity to a second slot. The drive mechanism is located outside the high-temperature melt and is configured to reciprocate in and out of the storage cavity. The small valve ball prevents the high-temperature melt sucked into the discharge tube from flowing back when the drive mechanism sucks into the storage cavity. The large valve ball prevents the high-temperature melt sucked into the pump body from flowing back when the drive mechanism discharges into the storage cavity. The drive mechanism includes a suction tube and a reciprocating piston pump. One end of the suction tube is connected to the storage cavity, and the other end is connected to the pump cylinder of the reciprocating piston pump. A buffer device is also connected between the suction tube and the reciprocating piston pump via an extension tube. The extrusion tube includes a first tube section and a second tube section. The first tube section is vertically installed in the storage cavity and is located below the horizontal plane of the high-temperature melt. The second tube section is horizontally installed in the pump body. The two ends of the second tube section are respectively located in the first groove and the second groove. The end of the second tube section located in the first groove is connected to the upper end of the first tube section, so that the extrusion tube is completely immersed in the high-temperature melt. The density of a small valve ball is greater than that of a high-temperature melt; the density of a large valve ball is greater than that of a high-temperature melt.

2. The pressure pump for conveying high-temperature melt according to claim 1, characterized in that, The lower end of the first pipe section is provided with a tapered opening, and the small valve ball is movably disposed inside the first pipe section. The diameter of the small valve ball is larger than the inner diameter of the tapered opening and smaller than the inner diameter of the first pipe section.

3. The pressure pump for conveying high-temperature melt according to claim 1, characterized in that, The extrusion tube can also be located on the outside of the high-temperature melt, with the portion of the extrusion tube located on the outside of the high-temperature melt wrapped with refractory and heat-insulating material.

4. The pressure pump for conveying high-temperature melt according to claim 3, characterized in that, The outer periphery of the extrusion tube is also covered with a heating device.

5. The pressure pump for conveying high-temperature melt according to claim 1, characterized in that, The large valve ball is movable up and down inside the storage cavity, and the diameter of the large valve ball is larger than the inner diameter of the suction tube and the diameter of the first section of the discharge tube.

6. The pressure pump for conveying high-temperature melt according to claim 1, characterized in that, The suction pipe, pump body, discharge pipe, suction pipe, small valve ball, and large valve ball are all made of high-temperature and corrosion-resistant materials.

7. A method of using a pressure pump for conveying high-temperature melts according to any one of claims 1 to 6, characterized in that, When it is necessary to transfer high-temperature melt from the first tank to the second tank, the following steps are included: S1, activate the drive mechanism to generate suction, which is transmitted to the storage chamber. The small valve ball falls and blocks the extrusion tube, preventing the melt in the extrusion tube from flowing back. The large valve ball rises and opens the suction tube, allowing the high-temperature melt to enter the storage chamber. S2, the drive mechanism generates pressure, the pressure is transmitted to the storage chamber, the large valve ball descends, blocking the suction pipe and preventing the melt in the pump body from flowing back, the small valve ball rises, opening the discharge pipe and allowing the high-temperature melt to enter the discharge pipe; S3, repeating steps S1 and S2, to transport the high-temperature melt into the second tank.

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