JP2012106269A - Inductive electromagnetic pump for molten metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inductive electromagnetic pump for molten metal in which a protective tube of a core 2 is stably supported in a pump side duct 1, and flow change of molten metal 12 caused by the temperature drop thereof hardly occurs inside a flange 6 and flanges 5, 5'.SOLUTION: The inductive electromagnetic pump for molten metal includes: cylindrical ducts 1, 1' through which the molten metal 12 passes; an inductor 14 which is provided on the outer circumference of the duct 1 and generates a shifting magnetic field in the duct 1; the core 2 which is disposed in the duct 1, and comprises a magnetic body forming a magnetic path of the shifting magnetic field generated in the inductor 14; and a protective tube 3 provided so as to cover the core 2. Ribs 18 long in the longitudinal direction of the protective tube 3 are provided on the outer circumference of the protective tube 3 of the core 2 at the equal angular spacing, and in accordance with the ribs, grooves 19 long in the longitudinal direction of the duct 1 are provided on the inner circumference of the pump side duct 1 at the equal angular spacing. Each rib 18 of the protective tube 3 is fitted in each groove 19 on the pump side duct 1 while the protective tube 3 of the core 2 is fitted in the pump side duct 1.

Description

  The present invention relates to an induction electromagnetic pump for molten metal used for transporting molten metal such as molten aluminum and molten zinc, and in particular, a protective tube covering the core for fixing a core that forms a magnetic path inside the duct. The present invention relates to an induction electromagnetic pump for molten metal that can stably support the core and its protective tube during the flow of molten metal, and can be easily maintained.

  For example, in the field of casting or the like, an induction electromagnetic pump for molten metal is used to convey molten aluminum or the like by applying a thrust to the molten metal by electromagnetic induction. Inductive electromagnetic pumps for molten metal are mainly inductive electromagnetic pumps that generate a moving magnetic field inside a cylindrical duct by an inductor wound around a magnetic core to provide thrust to the molten metal. It is.

  Such induction electromagnetic pumps are described in JP-B-4-52708, JP-A-7-203668, and JP-A-2006-341281. A magnetic material that forms a magnetic path of a magnetic field generated by an inductor inside a tubular duct by arranging an inductor wound around a core for generating a moving magnetic field on the outer periphery of a tubular duct tube through which molten metal flows The core is arranged. The core is covered with a cylindrical protective tube having heat resistance and corrosion resistance. Therefore, the flow path of the molten metal becomes an annular portion formed between the tubular duct and the protective tube, and this kind of induction electromagnetic pump is called an annular flow path induction electromagnetic pump.

  In an induction electromagnetic pump, if a core is not arranged inside the duct, a magnetic path is not formed inside the duct, so the magnetic flux density at the center of the duct becomes extremely small, and the thrust at that part becomes low, or there is no thrust. End up. For this reason, it is indispensable to arrange the core inside the duct. However, in the flow-path type induction electromagnetic pump for casting having a core inside the duct, there are a spacer provided in the protective tube of the core, a protrusion on the inner periphery of the duct for holding the protective tube against this spacer, etc. The stagnation of the molten metal tends to occur at that portion. For this reason, wastes such as oxides generated on the surface of the molten metal tend to collect, and the removal thereof is troublesome.

Therefore, an induction electromagnetic pump for molten metal described in Japanese Patent Application Laid-Open No. 2006-341281 has been proposed. This is shown in FIGS.
A straight pump-side duct 1 is connected to an opening provided obliquely upward near the bottom of the molten metal tank 11 containing the molten metal 12 via a flange 15. Further, a hot water supply side duct 1 ′ bent at 90 ° is connected to the other end of the pump side duct 1 via flanges 5 and 5 ′. These ducts 1 and 1 'are made of a heat-resistant and corrosion-resistant material such as ceramic.

  A core 2 made of a magnetic cylinder is arranged in a straight pump-side duct 1 on the near side so that the central axes thereof coincide with each other. The core 2 is accommodated in a cylindrical protective tube 3 whose both ends are closed, and is not in direct contact with the molten metal 12 in the pump-side duct 1. The protective tube 3 is made of a heat-resistant and corrosion-resistant material such as ceramic, and a filler 8 such as ceramic fiber such as alumina or magnesia or ceramic powder is filled around the core 2 therein as a cushioning material. ing.

  A flange 6 extends around one end of the protective tube 3 near the hot water supply side duct 1 ', and a portion near the outer periphery of the flange 6 connects the pump side duct 1 and the hot water supply side duct 1'; Sandwiched between 5 '. Thereby, the core 2 is held so as to be positioned at the center of the pump-side duct 1. The hot water supply side duct 1 ′ is pressed against the pump side duct 1 by the spring 10, and the flange 6 of the protective tube 3 is sandwiched between the flanges 5, 5 ′ by a gasket (not shown) and the sealing property is secured. doing.

In order to hold the core 2 at the center of the protective tube 3 and eliminate rattling due to vibration during operation, a filler 8 such as a ceramic fiber such as alumina or magnesia or ceramic powder is used as a cushion material in the protective tube 3. Filled. When the concentricity of the protection tube 3 changes with the core 2, the electromagnetic force also changes, and it becomes impossible to secure a stable thrust of the molten metal 12 in the pump side duct 1. The end portion of the protective tube 3 is closed by a heat-resistant and corrosion-resistant end plug 4 made of ceramic or the like. The core 2 and the filler 8 are stored and filled in the protective tube 3 by opening the end plug 4.
A passage 7 for passing the molten metal 12 is provided in a portion closer to the inner periphery side than a portion near the outer periphery of the flange 6 sandwiched between the flanges 5 and 5 ′. For example, the passage 7 has a long hole shape that is long in the circumferential direction.

A cylindrical inductor 14 in which a magnetic core is wound around is disposed around a straight pump-side duct 1 in front. By this inductor 14, a moving magnetic field is formed inside the pump side duct 1, and thrust is given to the molten metal 12 in the pump side duct 1. The magnetic core 2 forms a magnetic path of a moving magnetic field on the central axis of the pump-side duct 1, thereby maintaining the magnetic flux density of the moving magnetic field in the pump-side duct 1, The thrust of the molten metal 12 in the duct 1 is ensured.
A heater 9 is wound around the outer periphery of the ducts 1, 1 ′, and the ducts 1, 1 ′ are heated by the heater 9 to prevent the molten metal 12 from solidifying therein.

  In such a conventional induction electromagnetic pump for molten metal, the flange 6 provided at one end of the protective tube 3 housing the core 2 is sandwiched between the flanges 5 and 5 ', as shown in FIG. In addition, if the inclination of the pump side duct 1 is loose, the gravity of the core 2 and its protective tube 3 is concentrated on the flange 6, and the protective tube 3 cannot be stably held unless the elasticity of the spring 10 is very strong. However, since the flange 6 is made of a brittle ceramic, the portion of the flange 5 or 5 'where the stress concentrates is likely to break, and there is a limit to increasing the elasticity of the spring 10.

  Further, the heater 9 is difficult to wind around the flange 6 and the flanges 5 and 5 ′, and the portion protrudes outward to easily radiate heat. Further, the passage 6 in the inner portion of the flange 6 and the flanges 5 and 5 ′ has a smaller channel cross-sectional area than the other portions of the ducts 1 and 1 ′. For this reason, the temperature of the molten metal 12 falls inside the flange 6 and the flanges 5, 5 ′, the specific resistance of the molten metal 12 changes, and the flow rate changes. In addition, if the fluidity is lost, the molten metal 12 tends to stagnate in the portion of the passage 7 inside the flange 6 and the flanges 5, 5 ′. When the stagnation of the molten metal 12 occurs, the flow of the molten metal 12 in the ducts 1, 1 ′ is hindered, which hinders the supply of the molten metal 12.

JP 2009-012024 A JP 2006-341281 A Japanese Patent Laid-Open No. 07-203668 JP 05-285638 A Japanese Patent Laid-Open No. 05-042357 Japanese Patent Publication No. 04-52708

  The present invention can stably support the protective pipe of the core 2 in the pump-side duct 1 in view of the problems in the conventional induction electromagnetic pump for molten metal described above, and the flange 6 and the flanges 5 and 5 ′. It is an object of the present invention to provide an induction electromagnetic pump for molten metal that hardly changes in flow due to a decrease in temperature of the molten metal 12 inside.

  In the present invention, in order to achieve the above object, ribs 18 that are long in the longitudinal direction of the protective tube 3 are provided at equal angular intervals on the outer periphery of the protective tube 3 of the core 2, and correspondingly, the pump-side duct 1. In the inner periphery, a long groove 19 is provided in the longitudinal direction of the duct 1 at equal angular intervals, and the rib 18 of the protective tube 3 is fitted in the state where the protective tube 3 of the core 2 is fitted into the pump-side duct 1. It fits into the groove 19 of the pump side duct 1.

  That is, the induction electromagnetic pump for molten metal according to the present invention includes a cylindrical duct 1, 1 ′ through which the molten metal 12 passes and an inductor 14 that is provided on the outer periphery of the duct 1 and generates a moving magnetic field in the duct 1. And a core 2 made of a magnetic body that is disposed in the duct 1 and forms a magnetic path of a moving magnetic field generated by the inductor 14, and a protective tube 3 provided so as to cover the core 2. Ribs 18 that are long in the longitudinal direction of the protective tube 3 at equal angular intervals are provided on the outer periphery of the protective tube 3 of the core 2, and correspondingly, on the inner periphery of the pump side duct 1, the duct 1 is also spaced at equal angular intervals. A long groove 19 is provided in the longitudinal direction. Then, with the protective tube 3 of the core 2 fitted in the pump side duct 1, the rib 18 of the protective tube 3 is fitted into the groove 19 of the pump side duct 1.

  More specifically, a flange 6 is provided in a part of the protective tube 3 covering the core 2, and the flange 2 is sandwiched between the flanges 5, 5 'or 15 of the duct 1, 1', whereby the core 2 is While being held in the duct 1, a passage 7 through which the molten metal 12 passes is provided in the flange 6 of the protective tube 3. The rib 18 of the protective tube 3 is provided continuously with the flange 6. A packing 20 is inserted between one of the flanges 5 and 5 'of the joined ducts 1 and 1' and the flanges 5 and 5 'of the other ducts 1 and 1' and the flange 6 of the protective tube 3. Join.

  In such a molten metal induction electromagnetic pump according to the present invention, the protective tube 3 covering the core 2 is sandwiched between the flanges 5, 5 ′ of the ducts 1, 1 ′ by the flange 6 provided at a part thereof. In addition to this, a plurality of longitudinally long ribs 18 provided at equiangular intervals on the outer periphery of the protective tube 3, and a plurality of longitudinally long grooves provided at equiangular intervals on the inner periphery of the pump side duct 1. By fitting in 19, the protective tube 3 is supported by the pump-side duct 1 over a certain distance. Thereby, the protective tube 3 can be stably supported in the pump side duct 1. Further, the protection tube 3 is prevented from rotating with respect to the pump-side duct 1.

  Furthermore, by providing the rib 18 of the protective tube 3 continuously with the flange 6, the heat from the heater 9 that heats the outer periphery of the pump-side duct 1 can be transferred to the flange 6 via the rib 18. . Therefore, the temperature of the molten metal 12 passing through the inner passage 7 can be kept, and the temperature of the molten metal 12 can be prevented from decreasing in the portion of the passage 7 and the fluidity being lowered. Further, by integrating the rib 18 of the protective tube 3 with the flange 6, the rib 18 and the flange 6 of the protective tube 3 can be reinforced mutually.

  As described above, in the molten metal induction electromagnetic pump according to the present invention, the protective tube 3 of the core 2 can be stably supported in the duct 1, so that the operation is not hindered. Moreover, since the flow change by the temperature fall of the molten metal 12 in the channel | path 7 inside the flange 6 can also be prevented, supply of the molten metal 12 can be performed smoothly.

It is sectional drawing which shows one Example of the induction | guidance | derivation electromagnetic pump for molten metals. It is a principal part expanded sectional view which shows the flange part of the core of the induction | guidance | derivation electromagnetic pump for molten metals shown in FIG. 1, its protective tube, and a duct. FIG. 2 is a partially exploded perspective view showing the protective tube and duct of the molten metal induction electromagnetic pump shown in FIG. 1 in an exploded manner. It is sectional drawing which shows the other Example of the induction | guidance | derivation electromagnetic pump for molten metals. It is a principal part expanded sectional view which shows the flange part of the core of the induction | guidance | derivation electromagnetic pump for molten metals shown in FIG. 4, its protective tube, and a duct. It is sectional drawing which shows the other Example of the induction | guidance | derivation electromagnetic pump for molten metals. It is sectional drawing which shows the other Example of the induction | guidance | derivation electromagnetic pump for molten metals. It is sectional drawing which shows the prior art example of the induction electromagnetic pump for molten metals. It is a principal part expanded sectional view which shows the flange part of the core of the induction | guidance | derivation electromagnetic pump for molten metals shown in FIG. 8, its protective tube, and a duct.

In the present invention, a plurality of long ribs 18 in the longitudinal direction of the protective tube 3 are provided at equal angular intervals on the outer periphery of the protective tube 3 covering the core 2, and a plurality of same angular intervals are provided on the inner periphery of the duct 1. The object is achieved by providing a long groove 19 in the longitudinal direction of the duct 1 and fitting the rib 18 of the protective tube 3 into the groove 19 of the duct 1 in a state where the protective tube 3 is fitted in the duct 1.
Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

1 to 3 show an embodiment of an external induction electromagnetic pump for molten metal according to the present invention. The structure of this molten metal induction electromagnetic pump is basically the same as that of the conventional induction electromagnetic pump described above with reference to FIGS. 8 and 9, and the same parts are denoted by the same reference numerals.
A hot water supply port opens on an oblique wall surface 13 near the bottom of the molten metal tank 11 containing the molten metal 12, and a straight pump side duct 1 is connected to the hot water supply port via a flange 15. The pump-side duct 1 is inclined so that the left end side in FIG.

  A hot water supply side duct 1 ′ bent at 90 ° is connected to the front end of the straight pump side duct 1 via flanges 5 and 5 ′. FIG. 2 is an enlarged view of the front and rear portions of the flanges 5 and 5 ′ of the ducts 1 and 1 ′ in FIG. 1. These ducts 1, 1 'are made of a heat-resistant and corrosion-resistant material such as ceramic. As shown in FIG. 1, the ducts 1, 1 ′ have a long shape from the opening end where the flange 5 of the pump side duct 1 is provided toward the back of the duct 1. In the illustrated example, the grooves 19 are rectangular grooves, and the number thereof is three at intervals of 120 °. However, as long as it corresponds to the rib 18 of the protective tube 3 described later, the shape and number can be any shape and number. Specifically, it is a chevron groove, a trapezoidal groove or the like, and the number thereof may be two or more.

  As shown in FIGS. 1 and 2, a core 2 made of a magnetic cylinder is disposed in the pump-side duct 1 on the front side so that the central axes thereof coincide with each other. The core 2 is housed in a cylindrical protective tube 3 whose both ends are closed, and does not directly contact the molten metal 12 in the pump side duct 1. The protective tube 3 of the core 2 is made of a heat-resistant and corrosion-resistant material such as ceramic.

  As shown in FIG. 1 to FIG. 3, a flange 6 extends around one end portion of the protective tube 3 near the hot water supply side duct 1 ′, and the portion near the outer periphery of the flange 6 is the duct 1 and the duct 1 ′. Are sandwiched between flanges 5 and 5 '. Thereby, the core 2 is held so as to be positioned at the center of the duct 1.

If it demonstrates concretely with FIG. 2, the recessed part 21 will be provided around the center part of the joint surface of flange 5 'of hot water supply side duct 1', and the gasket 20 will be engage | inserted here. As shown in FIG. 3, a recess 22 is provided around the center of the joint surface of the flange 5 of the other pump-side duct 1, and the flange 6 of the protective tube 3 is fitted therein. In addition, you may provide the recessed part 21 which accommodates the gasket 20, and the recessed part 22 which accommodates the flange 6 of the protective tube 3 in flange 5, 5 'opposite to the example of illustration.
As shown in FIG. 1, the hot water supply side duct 1 ′ is pressed against the duct 1 in front by a spring 10, and sandwiches the gasket 20 and the flange 6 of the protective tube 3 between the flanges 5, 5 ′.

  Further, a rib 18 is provided on the outer periphery of the protective tube 3 continuously to the flange 6. The rib 18 has a height from the outer peripheral surface of the protective tube 3 lower than that of the flange 6 and extends continuously from the flange 6 toward the other end of the protective tube 3, that is, in the longitudinal direction of the protective tube 3. Yes. In the illustrated example, the ribs 18 are rectangular ribs corresponding to the grooves 18 of the pump-side duct 1 described above, and the number thereof is three at intervals of 120 °. However, as long as the shape and number correspond to the groove 19 of the pump-side duct 1 described above, any shape and number can be used. Specifically, it is a chevron rib, a trapezoidal rib, etc., and the number may be two or more.

  Since the protective tube 3 is a molded body such as ceramic, the flange 6 and the rib 18 are preferably molded integrally with the protective tube 3 rather than providing the flange 6 and the rib 18 as separate members. In the protective tube 3, in order to hold the core 2 in the center of the protective tube 3 and eliminate rattling due to vibration during operation, a filler such as ceramic fiber such as alumina or magnesia or ceramic powder is used as a cushioning material. 8 is filled. As shown in FIGS. 1 and 2, in the illustrated embodiment, the end of the protective tube 3 is closed by a heat-resistant and corrosion-resistant end plug 4 such as ceramic. As shown in FIG. 3, the core 2 and the filler 8 are stored and filled in the protective tube 3 by opening the end plug 4.

  A passage 7 for passing the molten metal 12 is provided in a portion closer to the inner periphery than a portion near the outer periphery sandwiched between the flanges 5 and 5 ′ of the flange 6. As shown in FIG. 3, for example, the passage 7 has a long hole shape that is long in the circumferential direction, and a space between the passage 7 is a cylindrical portion that is a main body portion of the protective tube 3 and flanges 5 and 5 of the flange 6. This is a spoke-like portion that integrally communicates with the rim-like portion on the outer peripheral side sandwiched by '.

  As shown in FIG. 1, a cylindrical inductor 14 in which a magnetic core is wound is disposed around a straight duct 1 in front. By this inductor 14, a moving magnetic field is formed inside the duct 1, and thrust is given to the molten metal 12 in the duct 1. The magnetic core 2 forms a magnetic path of the moving magnetic field on the central axis of the duct 1, thereby maintaining the magnetic flux density of the moving magnetic field generated by the inductor 14, The thrust of the molten metal 12 at is secured.

  As described above, the concave portion 22 is provided in the flange 5 of the pump-side duct 1 that is one of the flanges, and the flange 6 of the protective tube 3 is accommodated therein so that the flange 6 of the protective tube 3 is connected to the pump-side duct 1. Can be included inside. Thereby, the heat radiation from the flange 6 of the protective tube 3 can be suppressed, and the gaskets 5, 5 ′ and 6 can be sealed by inserting the gasket 20 in one place. It is easy to align the flanges 5, 5 ′ of the ducts 1, 1 ′ and the flange 6 of the protective tube 3. Moreover, the axial position of the protective tube 3 can be stopped by the recess 22 of the flange 5 that is easy to process.

  4 and 5 show another embodiment of the external induction electromagnetic pump for molten metal according to the present invention. The structure of the induction electromagnetic pump for molten metal is basically the same as that of the induction electromagnetic pump described above with reference to FIGS. 1 to 3, but in this example, no recess 21 is provided in the flange 5 ′ of the hot water supply side duct 1 ′. The surface is flat and the gasket 20 is attached to the surface. This gasket 20 is sandwiched between the flange 5 ′ of the hot water supply side duct 1 ′, the flange 5 of the pump side duct 1, and the flange 6 of the protective tube 3. Other parts are the same as those of the induction electromagnetic pump described above with reference to FIGS. 1 to 3, and the same parts are denoted by the same reference numerals.

  6 and 7 are examples of an immersion electromagnetic pump for molten metal. In this type of induction electromagnetic pump for molten metal, the inductor 14 is housed in a protective cylinder 16 made of a material having heat resistance and corrosion resistance, such as ceramic, and the entire portion of the pump is immersed in the molten metal 12. . The inductor 14 is insulated by the protective cylinder 16 and the duct 1 so as not to contact the molten metal 12. There is a hole for introducing the molten metal 12 at the center of the lower end of the protective cylinder 16, and the lower end of the duct 1 is joined to this portion, and the molten metal 12 is pumped up from the lower end of the duct 1.

  The embodiment of the immersion type induction electromagnetic pump for molten metal shown in FIG. 6 is a protective pipe between the flanges 5 and 5 'of the vertical pump side duct 1 and the hot water supply side duct 1' bent halfway at 90 °. 3 is an example in which a portion close to the outer periphery of the flange 6 is sandwiched. Also in this molten metal induction electromagnetic pump, a rib 18 is provided continuously to the flange 6 on the outer periphery of the end of the protective tube 3, and a groove 19 is provided corresponding to the rib 18 on the inner periphery of the end of the pump-side duct 1. . When the protective tube 3 containing the core 2 is inserted into the opening end of the pump-side duct 1 provided with the flange 5, the rib 18 of the protective tube 3 is inserted into the groove 19 of the pump-side duct 1. It is out.

  Further, in the embodiment of the immersion type induction electromagnetic pump for molten metal shown in FIG. 7, the periphery of the hole for introducing the molten metal 12 provided at the center of the lower end of the protective drum 16 and the lower end of the duct 1 are joined to each other. This is an example in which a portion close to the outer periphery of the flange 6 of the protective tube 3 is sandwiched between the flange 15 for the purpose. Also in this molten metal induction electromagnetic pump, a rib 18 is provided continuously to the flange 6 on the outer periphery of the end of the protective tube 3, and a groove 19 is provided corresponding to the rib 18 on the inner periphery of the end of the pump-side duct 1. . When the protective tube 3 containing the core 2 is inserted into the opening end of the pump-side duct 1 provided with the flange 5, the rib 18 of the protective tube 3 is inserted into the groove 19 of the pump-side duct 1. It is out. The only difference is that the direction in which the protective tube 3 is fitted into the pump-side duct 1 is opposite to that in the embodiment described above with reference to FIG.

In the embodiment described above with reference to FIGS. 6 and 7, the structure of the induction electromagnetic pump other than those described above and the connection of the ducts 1 and 1 ′ are basically the same as those shown in FIGS. The same parts are indicated by the same reference numerals.
In the above-described embodiment, for convenience of explanation, the ducts 1 and 1 ′ are described separately as a pump side duct 1 and a hot water supply side duct 1 ′ connected via flanges 5 and 5 ′. There is no need to distinguish them, and they can be understood as a series of ducts.

  The induction electromagnetic pump for molten metal according to the present invention is used for conveying molten aluminum, zinc, etc., and is used in, for example, casting departments such as aluminum die casting and low pressure casting, and metal raw material refining departments. Is done.

DESCRIPTION OF SYMBOLS 1 Pump side duct 1 'Hot water supply side duct 2 Core 3 Protective pipe 5 Duct flange 5' Duct flange 6 Protective pipe flange 7 Flange passage 18 Protective pipe rib 19 Duct groove 20 Packing

Claims (3)

A cylindrical duct 1, 1 ′ through which the molten metal 12 passes, an inductor 14 that is provided on the outer periphery of the duct 1 and generates a moving magnetic field in the duct 1, and is disposed in the duct 1, and the inductor 14 In the molten metal induction electromagnetic pump having the core 2 made of a magnetic material that forms the magnetic path of the moving magnetic field generated in step 1 and the protective tube 3 provided so as to cover the core 2, the protective tube 3 of the core 2 Long ribs 18 in the longitudinal direction of the protective tube 3 are provided on the outer periphery at equal angular intervals, and correspondingly, grooves 19 that are long in the longitudinal direction of the duct 1 at equal angular intervals are provided on the inner periphery of the pump-side duct 1. A molten metal induction characterized in that the protective pipe 3 of the core 2 is fitted into the pump-side duct 1 and the rib 18 of the protective pipe 3 is fitted into the groove 19 of the pump-side duct 1. Electromagnetic pump. A flange 6 is provided on a part of the protective tube 3 covering the core 2, and the flange 6 is sandwiched between the flanges 5, 5 ′ or 15 of the duct 1, 1 ′ to hold the core 2 in the duct 1. The molten metal induction electromagnetic pump according to claim 1, wherein the rib is provided integrally with the flange. A packing 20 is inserted between one of the flanges 5 and 5 'of the joined ducts 1 and 1' and the flanges 5 and 5 'of the other ducts 1 and 1' and the flange 6 of the protective tube 3. The induction electromagnetic pump for molten metal according to claim 1, wherein the induction electromagnetic pump is joined.

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